Abstract:
The present invention provides a liquid crystal display including a plurality of pixel units defined by scanning lines and data lines. Each pixel unit includes two sub-pixels. Each sub-pixel includes a storage capacitor. The two storage capacitors in a pixel unit are connected to different voltage sources to modify the electric potential of the pixel electrodes.

Description:
RELATIED APPLICATIONS  
       [0001]    The present application is based on, and claims priority from, Taiwan Application Serial Number 95124379, filed Jul. 4, 2006, the disclosure of which is hereby incorporated by reference herein in its entirety. 
       FIELD OF THE INVENTION  
       [0002]    The present invention relates to a Liquid crystal display, and more particularly to a liquid crystal display with improved view angle. 
       BACKGROUND OF THE INVENTION  
       [0003]    Liquid crystal displays have been used in various electronic devices. A Vertically Aligned Mode (VA mode) liquid crystal display is developed to provide a wider viewing range. In the VA mode, when a user looks at this LCD from the oblique direction, the skin color of Asian people (light orange or pink) appears bluish or whitish. Such a phenomenon is called color wash-out. 
         [0004]    The transmittance-voltage (T-V) characteristic of the VA mode liquid crystal display is shown in  FIG. 1A  and  FIG. 1B . The vertical axis is the transmittance rate. The horizontal axis is the applied voltage. When the applied voltage is increased, the transmittance rate curve  102  in the normal direction is also increased. The transmittance changes monotonically as the applied voltage increases. However, in the oblique direction, the transmittance rate curve  104  winds and the various gray scales become the same. This is the main reason to cause the color wash-out. 
         [0005]    A method, called Half-tone technology developed by H. Yoshida et al. (Fujitsu Display Technologies Corporation), is provided to improve the foregoing problem. This method combines two different T-V characteristics in one pixel.  FIG. 1B  illustrates the Half-tone technology. The line  106  in  FIG. 1B  shows the T-V characteristics with a lower threshold voltage. The line  108  in  FIG. 1B  shows the T-V characteristics with a higher threshold voltage. By optimizing the threshold voltage and combining transmittance of these two lines, monotonic characteristics can be realized, as shown by the line  110  in  FIG. 1B . 
         [0006]    There are two types of Half-tone technologies, CC type and TT type.  FIG. 2A  illustrates the CC type Half-Tone technology.  FIG. 2B  illustrates the TT type Half-tone technology. According to the two types of Half-tone technologies, a pixel unit is divided into two sub pixels, the first sub-pixel and the second sub-pixel. Different Gamma curves are generated by the first sub-pixel and the second sub-pixel respectively. There, the color shift phenomenon is removed by mixing the two Gamma curves.  FIG. 2C  illustrates the Gamma curve of a CC type and  FIG. 2D  illustrates the Gamma curve of a TT type. For example, in  FIG. 2C , according to a special applied voltage, the Gamma curve of the first sub-pixel and the Gamma curve of the second sub-pixel are mixed to form the Gamma curve of the pixel unit. 
         [0007]    In  FIG. 2A , a pixel unit is divided into two regions. A voltage divider composed of two capacitors  214  and  210  is used to form two Gamma curves of two sub-pixel electrodes  206  and  212  respectively. A data voltage in the data line is transferred to the sub-pixel electrode  206  through the transistor  202  to form the electric potential thereon. On the other hand, the electrical potential of the sub-pixel electrode is determined by the data line through capacitor  210 . That is, the sub-pixel electrode  212  is in a floating state. Its electric potential is determined by a coupling effect. Charge is trapped into the sub-pixel electrode  212  to shift the electric potential thereon. That affects the quality of a panel. 
         [0008]    In  FIG. 2B , a pixel unit is divided into two regions. Two thin film transistors  218  and  220  and two capacitors are arranged in the two regions respectively. Two scanning lines or two data lines are used to drive transistors  218  and  220  respectively to form two different Gamma curves to improve the display image quality. However, such structure requires two scanning lines or two data lines to drive a pixel unit, which reduces the aperture ratio and complicates the circuit. 
         [0009]    Therefore, a pixel unit and liquid crystal display driving method thereof is required to resolve the foregoing problems. 
       SUMMARY OF THE INVENTION  
       [0010]    The main purpose of the present invention is to provide a liquid crystal display with a wide view angle that combines two different T-V characteristics to avoid the color shift phenomenon. 
         [0011]    The purpose of the present invention is to provide a pixel unit with two different T-V characteristics to avoid the charge accumulation and the electrical potential shift phenomenon. 
         [0012]    The purpose of the present invention is to provide a pixel unit to simplify the circuit and reduce power consumption. 
         [0013]    Accordingly, the liquid crystal display comprises a plurality of parallel scanning lines and a plurality of parallel data lines that cross the scanning lines, wherein the adjacent first scanning line and data line define a pixel unit including a first sub-pixel and a second sub-pixel. Each sub-pixel includes a storage capacitor. The two storage capacitors are coupled to different voltage sources to modify the pixel electrodes to make the two pixel electrodes have different electric potentials. The different electric potentials generate different T-V characteristics. A monotonic T-V characteristic is generated by combing the different T-V characteristics. 
         [0014]    According to another embodiment, a pixel unit of the present invention comprises: a first thin film transistor located in the first sub-pixel, wherein the first thin film transistor includes a first gate electrode, a first source electrode and a first drain electrode; and a second thin film transistor located in the second sub-pixel, wherein the second thin film transistor includes a second gate electrode, a second source electrode and a second drain electrode, wherein the first source electrode is coupled to a first voltage source, the second source electrode is coupled to a second voltage source, the first drain electrode is coupled to the data line, and the second drain electrode receives a voltage transferred in the data line. 
         [0015]    According to an embodiment, the second drain electrode is coupled to the data line. 
         [0016]    According to an embodiment, the second voltage source is from the second scanning line. 
         [0017]    According to an embodiment, the first voltage source is from the second scanning line. 
         [0018]    According to an embodiment, the second drain electrode is coupled to the first source electrode. 
         [0019]    According to an embodiment, the second voltage source is from the second scanning line. 
         [0020]    According to an embodiment, the first voltage source is from a common electrode line. 
         [0021]    According to an embodiment, the first voltage source is from the second scanning line. 
         [0022]    According to an embodiment, the first voltage source and second voltage source are the same voltage source. 
         [0023]    According to another purpose of the present invention, the present invention provides a liquid crystal display driving method. The method comprises providing a high level electric potential to a first scanning line for writing a data signal transferred in a data line to a first sub-pixel electrode through a first thin film transistor and to a second sub-pixel electrode through a second thin film transistor; and to provide a low level electric potential to the first scanning line for isolating the first sub-pixel electrode and the second sub-pixel electrode from the data line. After the electric potential transition of the first scanning line between the high level electric potential and the low level electric potential, a coupling electric potential is generated to the first sub-pixel electrode and the second sub-pixel electrode, a second scanning line is adjacent to the first scanning line. 
         [0024]    According to an embodiment, the liquid crystal display driving method is a three level liquid crystal display driving method including a first electric potential, a second electric potential and a third electric potential, wherein the first electric potential is larger than the second electric potential, and the second electric potential is larger than the third electric potential. 
         [0025]    According to an embodiment, the high level electric potential is the first electric potential, the low level electric potential is the second electric potential, and the coupling electric potential is generated in the second scanning line transferred from the third electric potential to the second electric potential. 
         [0026]    According to an embodiment, the high level electric potential is the first electric potential, the low level electric potential is the third electric potential, and the coupling electric potential is generated when the electric potential in the second scanning line when the second electric potential transited to the third electric potential. 
         [0027]    According to an embodiment, the liquid crystal display driving method is a four liquid crystal display driving method including a first electric potential, a second electric potential, third electric potential and a fourth electric potential, wherein the first electric potential is larger than the second electric potential, the second electric potential is larger than the third electric potential, and the third electric potential is larger than the fourth electric potential. 
         [0028]    According to an embodiment, the high level electric potential is the first electric potential, the low level electric potential is the second electric potential, and the coupling electric potential is generated in the second scanning line when the fourth electric potential transited to the third electric potential. 
         [0029]    According to an embodiment, the high level electric potential is the first electric potential, the low level electric potential is the fourth electric potential, and the coupling electric potential is generated in the second scanning line when the second electric potential transited to the third electric potential. 
         [0030]    According to an embodiment, the high level electric potential is the first electric potential, the low level electric potential is the third electric potential, and the coupling electric potential is generated in the second scanning line when the fourth electric potential transited to the third electric potential. 
         [0031]    According to an embodiment, the high level electric potential is the first electric potential, the low level electric potential is the third electric potential, and the coupling electric potential is generated in the second scanning line when the second electric potential transited to the third electric potential. 
         [0032]    Accordingly, a pixel unit in the present invention is divided into two sub-pixels. Each sub-pixel includes a thin film transistor, a liquid crystal capacitor and a storage capacitor. The two sub-pixels generate different pixel voltages to compensate for each other to release the color shift phenomenon. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0033]    The foregoing aspects and many of the attendant advantages of this invention are more readily appreciated and better understood by referencing the following detailed description, when taken in conjunction with the accompanying drawings, wherein: 
           [0034]      FIG. 1A  and  FIG. 1B  illustrate the transmittance-voltage (T-V) characteristic of VA mode liquid crystal display; 
           [0035]      FIG. 2A  illustrates a typical CC type pixel unit. 
           [0036]      FIG. 2B  illustrates a typical TT type pixel unit. 
           [0037]      FIG. 2C  illustrates a Gamma characteristic curve diagram of a typical CC type pixel unit. 
           [0038]      FIG. 2D  illustrates a Gamma characteristic curve diagram of a typical TT type pixel unit. 
           [0039]      FIG. 3  illustrates a schematic diagram of a pixel unit according to the first embodiment of the present invention. 
           [0040]      FIG. 4  illustrates a schematic diagram of a pixel unit according to the second embodiment of the present invention. 
           [0041]      FIG. 5  illustrates a schematic diagram of a pixel unit according to the third embodiment of the present invention. 
           [0042]      FIG. 6  illustrates a schematic diagram of a pixel unit according to the fourth embodiment of the present invention. 
           [0043]      FIG. 7  illustrates a schematic diagram of a pixel unit according to the fifth embodiment of the present invention. 
           [0044]      FIG. 8  illustrates the three-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
           [0045]      FIG. 9  illustrates the four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
           [0046]      FIG. 10  illustrates the two steps four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
           [0047]      FIG. 11  illustrates the three-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
           [0048]      FIG. 12  illustrates the four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
           [0049]      FIG. 13  illustrates the two steps four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
           [0050]      FIG. 14  illustrates the one step two-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0051]      FIG. 3  is a schematic diagram of a pixel unit according to the first embodiment of the present invention. The pixel unit  300  includes two sub-pixels  302  and  304 . The sub-pixel  302  includes a thin film transistor  3010 . According to the thin film transistor  3010 , the gate electrode is connected to the scanning line  3006 , the drain electrode is connected to the data line  3008  and the source electrode is connected to the pixel electrode  3022 . The storage capacitor  3014  is composed of the pixel electrode  3022  and the scanning line  3002 . The liquid crystal capacitor  3018  is composed of the pixel electrode  3022  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  3026  exists between the gate and the source electrode of the thin film transistor  3010 . 
         [0052]    The sub-pixel  304  includes a thin film transistor  3012 . According to the thin film transistor  3012 , the gate electrode is connected to the scanning line  3006 , the drain electrode is connected to the data line  3008  and the source electrode is connected to the pixel electrode  3024 . The storage capacitor  3016  is composed of the pixel electrode  3024  and the common electrode line  3004 . The liquid crystal capacitor  3020  is composed of the pixel electrode  3024  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  3028  exists between the gate and the source electrode of the thin film transistor  3012 . According to this embodiment, the gate electrodes of the thin film transistors  3010  and  3012  are connected to the scanning line  3006 . The drain electrodes of the thin film transistors  3010  and  3012  are connected to the data line  3008 . Therefore, the two thin film transistors  3010  and  3012  are connected in parallel. In other words, the pixel electrodes  3022  and  3024  are not in the floating state. The charge aggregation phenomenon and the electric potential shift phenomenon do not happen. Moreover, only the scanning line  3002  and  3006 , data line  3008  and the common electrode line  3004  are required to reduce the color shift in this embodiment. It is not necessary to increase the additional scanning line or electrical potential source in this embodiment. 
         [0053]      FIG. 4  is a schematic diagram of a pixel unit according to the second embodiment of the present invention. The pixel unit  400  includes two sub-pixels  402  and  404 . The sub-pixel  402  includes a thin film transistor  4010 . According to the thin film transistor  4010 , the gate electrode is connected to the scanning line  4006 , the drain electrode is connected to the data line  4008  and the source electrode is connected to the pixel electrode  4016 . The storage capacitor  4014  is composed of the pixel electrode  4016  and the common electrode line  4004 . The liquid crystal capacitor  4020  is composed of the pixel electrode  4016  and the conductive electrode in the upper substrate (not shown in figure). The source electrode of the thin film transistor  4010  is connected to the drain electrode of the thin film transistor  4022 . A parasitical capacitor  4018  exists between the connection point and the gate of the thin film transistor  4010 . 
         [0054]    The sub-pixel  404  includes a thin film transistor  4022 . According to the thin film transistor  4022 , the gate electrode is connected to the scanning line  4006 , the drain electrode is connected to the source electrode of the thin film transistor  4010  and the source electrode is connected to the pixel electrode  4028 . The storage capacitor  4026  is composed of the pixel electrode  4028  and the scanning line  4002 . The liquid crystal capacitor  4032  is composed of the pixel electrode  4028  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  4030  exists between the gate and the source electrode of the thin film transistor  4022 . According to this embodiment, the source electrode of the thin film transistor  4010  is connected to the drain electrode of the thin film transistor  4022 . Therefore, the two thin film transistors  4010  and  4022  are connected in parallel. In other words, the pixel electrodes  4016  and  4028  are not in the floating state. The charge aggregation phenomenon and the electric potential shift phenomenon do not happen. Moreover, only the scanning line  4002  and  4006 , data line  4008  and the common electrode line  4004  are required to reduce the color shift in this embodiment. It is not necessary to increase the additional scanning line or data line in this embodiment. 
         [0055]      FIG. 5  is a schematic diagram of a pixel unit according to the third embodiment of the present invention. The pixel unit  500  includes two sub-pixels  502  and  504 . The sub-pixel  502  includes a thin film transistor  5010 . According to the thin film transistor  5010 , the gate electrode is connected to the scanning line  5006 , the drain electrode is connected to the data line  5008  and the source electrode is connected to the pixel electrode  5022 . The storage capacitor  5014  is composed of the pixel electrode  5022  and the scanning line  5002 . The liquid crystal capacitor  5018  is composed of the pixel electrode  5022  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  5026  exists between the source electrode and the gate of the thin film transistor  5010 . 
         [0056]    The sub-pixel  504  includes a thin film transistor  5012 . According to the thin film transistor  5012 , the gate electrode is connected to the scanning line  5006 , the drain electrode is connected to the data line  5008  and the source electrode is connected to the pixel electrode  5024 . The storage capacitor  5016  is composed of the pixel electrode  5024  and the scanning line  5002 . The liquid crystal capacitor  5020  is composed of the pixel electrode  5024  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  5028  exists between the gate and the source electrode of the thin film transistor  5012 . According to this embodiment, the gate electrodes of the thin film transistors  5010  and  5012  are connected to the scanning line  5006 . The drain electrodes of the thin film transistors  5010  and  5012  are connected to the data line  5008 . Therefore, the two thin film transistors  5010  and  5012  are connected in parallel. In other words, the pixel electrodes  5022  and  5024  are not in the floating state. The charge aggregation phenomenon and the electric potential shift phenomenon do not happen. Moreover, only the scanning line  5002  and  5006 , data line  5008  and the common electrode line  5004  are required to reduce the color shift in this embodiment. It is not necessary to increase the additional scanning line or data line in this embodiment. 
         [0057]    According to this embodiment, the storage capacitor  5014  is composed of the pixel electrode  5022  and the scanning line  5002 . The storage capacitor  5016  is composed of the pixel electrode  5024  and the scanning line  5002 . Therefore, the electric potential of the pixel electrodes  5022  and  5024  is separated by modifying the capacitance of the storage capacitor  5014  and  5016  and by a driving wave and the coupling effect of the storage capacitor  5014  and  5016 . Moreover, the output range of the electric potential in the data line be reduced, which also reduces the power. 
         [0058]      FIG. 6  is a schematic diagram of a pixel unit according to the fourth embodiment of the present invention. The pixel unit  600  includes two sub-pixels  602  and  604 . The sub-pixel  602  includes a thin film transistor  6010 . According to the thin film transistor  6010 , the gate electrode is connected to the scanning line  6006 , the drain electrode is connected to the data line  6008  and the source electrode is connected to the pixel electrode  6016 . The storage capacitor  6014  is composed of the pixel electrode  6016  and the scanning line  6002 . The liquid crystal capacitor  6020  is composed of the pixel electrode  6016  and the conductive electrode in the upper substrate (not shown in figure). The source electrode of the thin film transistor  6010  is connected to the drain electrode of the thin film transistor  6022 . A parasitical capacitor  6018  exists between the connection point and the gate of the thin film transistor  6010 . 
         [0059]    The sub-pixel  604  includes a thin film transistor  6022 . According to the thin film transistor  6022 , the gate electrode is connected to the scanning line  6006 , the drain electrode is connected to the source electrode of the thin film transistor  6010  and the source electrode is connected to the pixel electrode  6028 . The storage capacitor  6026  is composed of the pixel electrode  6028  and the scanning line  6002 . The liquid crystal capacitor  6032  is composed of the pixel electrode  6028  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  6030  exists between the gate and the source electrode of the thin film transistor  6022 . According to this embodiment, the source electrode of the thin film transistor  6010  is connected to the drain electrode of the thin film transistor  6022 . Therefore, the two thin film transistors  6010  and  6022  are connected in series. In other words, the pixel electrodes  6016  and  6028  are not in the floating state. The charge aggregation phenomenon and the electric potential shift phenomenon do not happen. Moreover, only the scanning line  6002  and  6006  and the data line  6008  are required to reduce the color shift in this embodiment. It is not necessary to increase the additional scanning line or data line in this embodiment. 
         [0060]    According to this embodiment, the storage capacitor  6014  is composed of the pixel electrode  6016  and the scanning line  6002 . The storage capacitor  6026  is composed of the pixel electrode  6028  and the scanning line  6002 . Therefore, the electric potential of the pixel electrodes  6016  and  6028  be separated by modifying the capacitance of the storage capacitor  6014  and  6026  and by a driving wave and the coupling effect of the storage capacitor  6014  and  6026 . Moreover, the output range of the electric potential in the data line be reduced, which also reduces the power. 
         [0061]      FIG. 7  is a schematic diagram of a pixel unit according to the fifth embodiment of the present invention. The main difference between this embodiment and the foregoing embodiments is that the two thin film transistors  7010  and  7022  have different design specifications. Based on the different design specifications, the two thin film transistors  7010  and  7022  have different charge capacities. Therefore, the electric potential of the pixel electrodes  7016  and  7028  can be separated. 
         [0062]    The pixel unit  700  includes two sub-pixels  702  and  704 . The sub-pixel  702  includes a thin film transistor  7010 . According to the thin film transistor  7010 , the gate electrode is connected to the scanning line  7006 , the drain electrode is connected to the data line  7008  and the source electrode is connected to the pixel electrode  7016 . The storage capacitor  7014  is composed of the pixel electrode  7016  and the bias line  7002 . The liquid crystal capacitor  7020  is composed of the pixel electrode  7016  and the conductive electrode in the upper substrate (not shown in figure). The source electrode of the thin film transistor  7010  is connected to the drain electrode of the thin film transistor  7022 . A parasitical capacitor  7018  exists between the connection point and the gate of the thin film transistor  7010 . 
         [0063]    The sub-pixel  704  includes a thin film transistor  7022 . According to the thin film transistor  7022 , the gate electrode is connected to the scanning line  7006 , the drain electrode is connected to source electrode of the thin film transistor  7010  and the source electrode is connected to the pixel electrode  7028 . The storage capacitor  7026  is composed of the pixel electrode  7028  and the bias line  7002 . The liquid crystal capacitor  7032  is composed of the pixel electrode  7028  and the conductive electrode in the upper substrate (not shown in figure). A parasitical capacitor  7030  exists between the gate and the source electrode of the thin film transistor  7022 . According to this embodiment, the source electrode of the thin film transistor  7010  is connected to the drain electrode of the thin film transistor  7022 . Therefore, the two thin film transistors  7010  and  7022  are connected in series. In other words, the pixel electrodes  7016  and  7028  are not in the floating state. The charge aggregation phenomenon and the electric potential shift phenomenon do not happen. Moreover, only the bias line  7002  which be adjacent scanning line or common line, scanning line  7006  and the data line  7008  are required to reduce the color shift in this embodiment. It is not necessary to increase the additional scanning line or data line. 
         [0064]      FIG. 8  illustrates the three-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 8  and  FIG. 3  together. In this embodiment, the drive waveform includes three electric potentials, V 1 , V 2  and V 3 . The relationship among the three electric potentials is V 1 &gt;V 2 &gt;V 3 . The left part of  FIG. 8  illustrates the corresponding waveform in the even frame. The right part of  FIG. 8  illustrates the corresponding waveform in the odd frame. 
         [0065]    During the time segment T 1  of the even frame, the scanning line  3006  is selected. At this time, data with negative polarity is transferred in the data line  3008 . The electric potential of the gate electrodes of the thin film transistors  3010  and  3012  is increased to V 1  to turn on thin film transistor  3010  and  3012 . The data in the data line  3008  is transferred to the pixel electrode  3022  through the thin film transistor  3010 . The data in the data line  3008  is transferred to the pixel electrode  3024  through the thin film transistor  3012 . When time segment T 1  is almost over, the pixel electrodes  3022  and  3024  have the same electric potential. During the time segment T 2 , the electric potential on the scanning line  3006  is reduced to the electric potential V 2  to turn off the thin film transistor  3010  and  3012 . Therefore, the two pixel electrodes are isolated. 
         [0066]    On the other hand, the scanning line  3006  is coupled to the pixel electrode  3022  and  3024  through the parasitical capacitors  3026  and  3028  respectively. Therefore, the electric potentials of the pixel electrodes  3022  and  3024  are affected by the electric potential variation (V 1 -V 2 ) of the scanning line  3006  during the time segment T 2 . 
         [0067]    Moreover, the scanning line  3002  is coupled to the pixel electrode  3022  through the storage capacitors  3014 . Therefore, the electric potential of the pixel electrodes  3022  is also affected by the electric potential variation of the scanning line  3002 . During the time segment T 2 , the electric potential of the scanning line  3002  is changed from V 3  to V 2 . The increased electric potential variation (V 2 -V 3 ) of the scanning line  3002  is coupled to the pixel electrode  3022  to reduce the absolute value of the electric potential of the pixel electrode  3022 . Such variation separates the electric potential value between the pixel electrodes  3022  and  3024 . The different electric potential value forms different Gamma curves to reach the Half-tone effect. Therefore, the electric potential difference between the pixel electrode  3022  and  3024  is changed by modifying the capacitance of the storage capacitor  3014  and  3016 . 
         [0068]    During the time segment T 2 , the electric potential variation of the pixel electrode  3024 , ΔV( 3024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       C 
                       gs 
                     
                      
                     
                       ( 
                       3028 
                       ) 
                     
                   
                   
                     
                       C 
                       T 
                     
                      
                     
                       ( 
                       3024 
                       ) 
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       V 
                        
                       
                           
                       
                        
                       1 
                     
                     - 
                     
                       V 
                        
                       
                           
                       
                        
                       2 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3024)= C   lc (3020)+ C   st (3016)+ C   gs (3028) 
         [0069]    The C T ( 3024 ) is the total capacitance related to the pixel electrode  3024 . The C lc ( 3020 ) is the capacitance of the liquid crystal capacitor  3020 . The C st ( 3016 ) is the capacitance of the storage capacitor  3016 . The C gs ( 3028 ) is the capacitance of the parasitical capacitor  3028 . 
         [0070]    During the time segment T 2 , the electric potential variation of the pixel electrode  3022 , ΔV( 3022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3022 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           3026 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           3022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           3014 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           3022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3022)= C   lc (3018)+ C   st (3014)+ C   gs (3026) 
         [0071]    The C T ( 3022 ) is the total capacitance related to the pixel electrode  3022 . The C lc ( 3018 ) is the capacitance of the liquid crystal capacitor  3018 . The C st ( 3014 ) is the capacitance of the storage capacitor  3014 . The C gs ( 3026 ) is the capacitance of the parasitical capacitor  3026 . 
         [0072]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   3014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   3022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electic potential variation value of the pixel electrode  3022  because of the coupling effect from the scanning line  3002 . 
         [0073]    In the odd frame, positive polarity data is transferred in the data line  3008 . The main difference between the odd frame and the even frame is described in the following. During the time segment T 1  of the even frame, the three-level drive waveform for driving the scanning line  3002  is pulled down to the lowest electric potential V 3 . Then, during the time segment T 2  of the even frame, the three-level drive waveform for driving the scanning line  3002  is pulled up to the electric potential V 2 . Such a drive waveform reduces the absolute value of the electric potential variation in the pixel electrode  3022 . 
         [0074]    However, the drive waveform in the odd frame is different from the drive waveform in the even frame. During the time segment T 3  of the odd frame, the three-level drive waveform for driving the scanning line  3002  is pulled down to the electric potential V 2 . During the time segment T 4  of the odd frame, the three-level drive waveform for driving the scanning line  3006  is pulled down to the lowest electric potential V 3  to turn off the thin film transistor  3010  and  3012 . Then, the three-level drive waveform for driving the scanning line  3002  is first pulled down to the lowest electric potential V 3 . Such a drive waveform increases the absolute value of the electric potential variation in the pixel electrode  3022 . 
         [0075]    During the time segment T 4 , the electric potential variation of the pixel electrode  3024 , ΔV( 3024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       C 
                       gs 
                     
                      
                     
                       ( 
                       3028 
                       ) 
                     
                   
                   
                     
                       C 
                       T 
                     
                      
                     
                       ( 
                       3024 
                       ) 
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       V 
                        
                       
                           
                       
                        
                       1 
                     
                     - 
                     
                       V 
                        
                       
                           
                       
                        
                       3 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3024)= C   lc (3020)+ C   st (3016)+ C   gs (3028) 
         [0076]    The C T ( 3024 ) is the total capacitance related to the pixel electrode  3024 . The C lc ( 3020 ) is the capacitance of the liquid crystal capacitor  3020 . The C st ( 3016 ) is the capacitance of the storage capacitor  3016 . The C gs ( 3028 ) is the capacitance of the parasitical capacitor  3028 . 
         [0077]    During the time segment T 4 , the electric potential variation of the pixel electrode  3022 , ΔV( 3022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3022 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         3026 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         3022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         3014 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         3022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3022)= C   lc (3018)+ C   st (3014)+ C   gs (3026) 
         [0078]    The C T ( 3022 ) is the total capacitance related to the pixel electrode  3022 . The C lc ( 3018 ) is the capacitance of the liquid crystal capacitor  3018 . The C st ( 3014 ) is the capacitance of the storage capacitor  3014 . The C gs ( 3026 ) is the capacitance of the parasitical capacitor  3026 . 
         [0079]    The foregoing application of the drive waveform illustrated in  FIG. 8  is based on the pixel unit  300  of the first embodiment in  FIG. 3 . However, it is noticed that the drive waveform illustrated in  FIG. 8  also is used in the pixel unit  400  of the second embodiment in  FIG. 4 , in the pixel unit  500  of the third embodiment in  FIG. 5  and in the pixel unit  600  of the fourth embodiment in  FIG. 6 . 
         [0080]      FIG. 9  illustrates the four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 9  and  FIG. 3  together. In this embodiment, the drive waveform includes four electric potential, V 1 , V 2 , V 3  and V 4 . The relationship among the three electric potential is V 1 &gt;V 2 &gt;V 3 &gt;V 4 . The left part of  FIG. 9  illustrates the corresponding waveform in the even frame. The right part of  FIG. 9  illustrates the corresponding waveform in the odd frame. 
         [0081]    During the time segment T 1  of the even frame, the scanning line  3006  is selected. The electric potential of the scanning line  3002  is pulled down to the electric potential V 4 . At this time, negative polarity data is transferred in the data line  3008 . The electric potential of the gate electrodes of the thin film transistors  3010  and  3012  is increased to V 1  to turn on the thin film transistors  3010  and  3012 . The data in the data line  3008  is transferred to the pixel electrode  3022  through the thin film transistor  3010 . The data in the data line  3008  is transferred to the pixel electrode  3024  through the thin film transistor  3012 . When the time segment T 1  is almost over, the pixel electrodes  3022  and  3024  have the same electric potential. During the time segment T 2 , the electric potential on the scanning line  3006  is pulled down to the electric potential V 2  to turn off the thin film transistor  3010  and  3012 . At this moment, the electric potential on the scanning line  3002  is pulled up from the electric potential V 4  to the electric potential V 3 . 
         [0082]    On the other hand, the scanning line  3006  is coupled to the pixel electrode  3022  and  3024  through the parasitical capacitors  3026  and  3028  respectively. Therefore, the electric potential of the pixel electrodes  3022  and  3024  is affected by the electric potential variation (V 1 -V 2 ) of the scanning line  3006  during the time segment T 2 . 
         [0083]    Moreover, the scanning line  3002  is coupled to the pixel electrode  3022  through the storage capacitors  3014 . Therefore, the electric potential of the pixel electrode  3022  is also affected by the electric potential variation of the scanning line  3002 . During the time segment T 2  of the even frame, the electric potential of the scanning line  3002  is pulled up from the electric potential V 4  to the electric potential V 3 . The electric potential variation (V 3 -V 4 ) of the scanning line  3002  is coupled to the pixel electrode  3022  to reduce the absolute value of the electric potential of the pixel electrode  3022 . Such variation separates the electric potential value between the pixel electrodes  3022  and  3024 . The different electric potential value between the pixel electrodes  3022  and  3024  forms different Gamma curves to reach the Half-tone effect. 
         [0084]    During the time segment T 2 , the electric potential variation of the pixel electrode  3024 , ΔV( 3024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       C 
                       gs 
                     
                      
                     
                       ( 
                       3028 
                       ) 
                     
                   
                   
                     
                       C 
                       T 
                     
                      
                     
                       ( 
                       3024 
                       ) 
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       V 
                        
                       
                           
                       
                        
                       1 
                     
                     - 
                     
                       V 
                        
                       
                           
                       
                        
                       2 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3024)= C   lc (3020)+ C   st (3016)+ C   gs (3028) 
         [0085]    The C T ( 3024 ) is the total capacitance related to the pixel electrode  3024 . The C lc ( 3020 ) is the capacitance of the liquid crystal capacitor  3020 . The C st ( 3016 ) is the capacitance of the storage capacitor  3016 . The C gs ( 3028 ) is the capacitance of the parasitical capacitor  3028 . 
         [0086]    During time segment T 2 , the electric potential variation of the pixel electrode  3022 , ΔV( 3022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3022 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           3026 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           3022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           3014 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           3022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3022)= C   lc (3018)+ C   st (3014)+ C   gs (3026) 
         [0087]    The C T ( 3022 ) is the total capacitance related to the pixel electrode  3022 : The C lc ( 3018 ) is the capacitance of the liquid crystal capacitor  3018 . The C st ( 3014 ) is the capacitance of the storage capacitor  3014 . The C gs ( 3026 ) is the capacitance of the parasitical capacitor  3026 . Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   3014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   3022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   4 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation of the pixel electrode  3022  because of the coupling effect from the scanning line  3002 . 
         [0088]    In the odd frame of  FIG. 9 , positive polarity data is transferred in the data line  3008 . Please refer to  FIG. 9  and  FIG. 3  together. During the time segment T 3  of the odd frame, the four step drive waveform for driving the scanning line  3006  is pulled up to the electric potential V 1  to turn on the thin film transistors  3010  and  3012 . When the time segment T 3  is almost over, the pixel electrodes  3022  and  3024  have the same electric potential. At this time, the electric potential of the scanning line  3002  is pulled down to the electric potential V 2 . During the time segment T 4  of the odd frame, the four-level drive waveform for driving the scanning line  3006  is pulled down to the lowest electric potential V 4  to turn off the thin film transistor  3010  and  3012 . At this time, the drive waveform for driving the scanning line  3002  is pulled down to the electric potential V 3 . The electric potential variation (V 2 -V 3 ) of the scanning line  3002  is coupled to the pixel electrode  3022  through the storage capacitor  3014  to increase the absolute value of the electric potential variation of the pixel electrode  3022 . Such variation separates the electric potential value between the pixel electrodes  3022  and  3024 . The different electric potential values between the pixel electrodes  3022  and  3024  form different Gamma curves to reach the Half-tone effect. The advantage of using a four-level drive waveform is that more parameters be used to change the electric potential of the pixel electrodes  3022  and  3024 . Therefore, more electric potential difference variation between the pixel electrodes  3022  and  3024  is obtained to improve the color performance of the liquid crystal display. 
         [0089]    During the time segment T 4 , the electric potential variation of the pixel electrode  3024 , ΔV( 3024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       C 
                       gs 
                     
                      
                     
                       ( 
                       3028 
                       ) 
                     
                   
                   
                     
                       C 
                       T 
                     
                      
                     
                       ( 
                       3024 
                       ) 
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       V 
                        
                       
                           
                       
                        
                       1 
                     
                     - 
                     
                       V 
                        
                       
                           
                       
                        
                       4 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3024)= C   lc (3020)+ C   st (3016)+ C   gs (3028) 
         [0090]    The C T ( 3024 ) is the total capacitance related to the pixel electrode  3024 . The C lc ( 3020 ) is the capacitance of the liquid crystal capacitor  3020 . The C st ( 3016 ) is the capacitance of the storage capacitor  3016 . The C gs ( 3028 ) is the capacitance of the parasitical capacitor  3028 . 
         [0091]    During the time segment T 4 , the electric potential variation of the pixel electrode  3022 , ΔV( 3022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3022 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         3026 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         3022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         4 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         3014 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         3022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3022)= C   lc (3018)+ C   st (3014)+ C   gs (3026) 
         [0092]    The C T ( 3022 ) is the total capacitance related to the pixel electrode  3022 . The C lc ( 3018 ) is the capacitance of the liquid crystal capacitor  3018 . The C st ( 3014 ) is the capacitance of the storage capacitor  3014 . The C gs ( 3026 ) is the capacitance of the parasitical capacitor  3026 . 
         [0093]    The foregoing application of the drive waveform illustrated in  FIG. 9  is based on the pixel unit  300  of the first embodiment in  FIG. 3 . However, it is noticed that the drive waveform illustrated in  FIG. 9  also be used in the pixel unit  400  of the second embodiment in  FIG. 4 , in the pixel unit  500  of the third embodiment in  FIG. 5  and in the pixel unit  600  of the fourth embodiment in  FIG. 6 . 
         [0094]      FIG. 10  illustrates the two steps four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 10  and  FIG. 3  together. In this embodiment, the drive waveform includes four electric potential, V 1 , V 2 , V 3  and V 4 . The relationship among the three electric potential is V 1 &gt;V 2 &gt;V 3 &gt;V 4 . In this two-steps four-level drive waveform, the waveform transition is always from electric potential V 3  to the destination electric potential. Such transition avoids the problems of data mistake due to time delay and drive waveform un-uniform. The left part of  FIG. 10  illustrates the corresponding waveform in the even frame. The right part of  FIG. 10  illustrates the corresponding waveform in the odd frame. 
         [0095]    During the time segment T 1  of the even frame, the scanning line  3006  is selected. The electric potential of the scanning line  3006  is pulled up to the electric potential V 1  to turn on the thin film transistors  3010  and  3012 . The data in the data line  3008  is transferred to the pixel electrode  3022  through the thin film transistor  3010 . The data in the data line  3008  is transferred to the pixel electrode  3024  through the thin film transistor  3012 . When the time segment T 1  being almost over, the pixel electrodes  3022  and  3024  have the same electric potential. At this time, the electric potential of the scanning line  3002  is pulled down to the electric potential V 4  from the electric potential V 3 . During the time segment T 2 , the electric potential on the scanning line  3006  is pulled down to the electric potential V 2  to turn off the thin film transistor  3010  and  3012 . At this moment, the electric potential of the scanning line  3006  is first pulled down to the electric potential V 3 , then, to the electric potential V 2  to turn off the thin film transistor  3010  and  3012 . 
         [0096]    On the other hand, the scanning line  3006  is coupled to the pixel electrode  3022  and  3024  through the parasitical capacitors  3026  and  3028  respectively. Therefore, the electric potential of the pixel electrodes  3022  and  3024  is affected by the electric potential variation (V 1 -V 2 ) of the scanning line  3006  during the time segment T 2 . In this time segment T 2 , the pixel electrodes  3022  and  3024  have the same electric potential. 
         [0097]    During the time segment T 3 , the electric potential of the scanning line  3002  is pulled up from the electric potential V 4  to the electric potential V 3 . The scanning line  3002  is coupled to the pixel electrode  3022  through the storage capacitors  3014 . Therefore, the electric potential variation of the scanning line  3002  affects the electric potential of the pixel electrode  3022 . The electric potential variation (V 3 -V 4 ) of the scanning line  3002  is coupled to the pixel electrode  3022  to reduce the absolute value of the electric potential of the pixel electrode  3022 . Such variation separates the electric potential value between the pixel electrodes  3022  and  3024 . The different electric potential value between the pixel electrodes  3022  and  3024  forms different Gamma curves to reach the Half-tone effect. 
         [0098]    During the time segment T 3 , the electric potential variation of the pixel electrode  3024 , ΔV( 3024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       C 
                       gs 
                     
                      
                     
                       ( 
                       3028 
                       ) 
                     
                   
                   
                     
                       C 
                       T 
                     
                      
                     
                       ( 
                       3024 
                       ) 
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       V 
                        
                       
                           
                       
                        
                       1 
                     
                     - 
                     
                       V 
                        
                       
                           
                       
                        
                       2 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3024)= C   lc (3020)+ C   st (3016)+ C   gs (3028) 
         [0099]    The C T ( 3024 ) is the total capacitance related to the pixel electrode  3024 . The C lc ( 3020 ) is the capacitance of the liquid crystal capacitor  3020 . The C st ( 3016 ) is the capacitance of the storage capacitor  3016 . The C gs ( 3028 ) is the capacitance of the parasitical capacitor  3028 . 
         [0100]    During the time segment T 3 , the electric potential variation of the pixel electrode  3022 , ΔV( 3022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3022 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           3026 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           3022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           3014 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           3022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3022)= C   lc (3018)+ C   st (3014)+ C   gs (3026) 
         [0101]    The C T ( 3022 ) is the total capacitance related to the pixel electrode  3022 . The C lc ( 3018 ) is the capacitance of the liquid crystal capacitor  3018 . The C st ( 3014 ) is the capacitance of the storage capacitor  3014 . The C gs ( 3026 ) is the capacitance of the parasitical capacitor  3026 . 
         [0102]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   3014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   3022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   4 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation of the pixel electrode  3022  because of the coupling effect from the scanning line  3002 . 
         [0103]    In the odd frame of  FIG. 10 , positive polarity data is transferred in the data line  3008 . Please refer to  FIG. 10  and  FIG. 3  together. During the time segment T 4  of the odd frame, the drive waveform for driving the scanning line  3006  is pulled up to the electric potential V 1  to turn on the thin film transistors  3010  and  3012 . When the time segment T 4  being almost over, the pixel electrodes  3022  and  3024  almost have the same electric potential. During the time segment T 4 , the electric potential of the scanning line  3002  is first pulled down to the electric potential V 3 , then, pulled up the electric potential V 2 . During the time segment T 5  of the odd frame, the drive waveform for the driving the scanning line  3006  is pulled down to the lowest electric potential V 4  to turn off the thin film transistor  3010  and  3012 . At this time, the pixel electrode  3022  is isolated to the pixel electrode  3024 . The pixel electrodes  3022  and  3024  almost have the same electric potential. During the time segment T 6  of the odd frame, the drive waveform for driving the scanning line  3002  is pulled down to the electric potential V 3 . The electric potential variation (V 2 -V 3 ) of the scanning line  3002  is coupled to the pixel electrode  3022  through the storage capacitor  3014  to increase the absolute value of the electric potential variation of the pixel electrode  3022 . Such variation separates the electric potential value between the pixel electrodes  3022  and  3024 . The different electric potential value between the pixel electrodes  3022  and  3024  forms different Gamma curves to reach the Half-tone effect. The advantage of using four-level drive waveform is that more parameters are used to change the electric potential of the pixel electrodes  3022  and  3024 . Therefore, more electric potential difference variation between the pixel electrodes  3022  and  3024  is obtained to improve the color performance of the liquid crystal display. 
         [0104]    During the time segment T 6 , the electric potential variation of the pixel electrode  3024 , ΔV( 3024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       C 
                       gs 
                     
                      
                     
                       ( 
                       3028 
                       ) 
                     
                   
                   
                     
                       C 
                       T 
                     
                      
                     
                       ( 
                       3024 
                       ) 
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       V 
                        
                       
                           
                       
                        
                       1 
                     
                     - 
                     
                       V 
                        
                       
                           
                       
                        
                       4 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3024)= C   lc (3020)+ C   st (3016)+ C   gs (3028) 
         [0105]    The C T ( 3024 ) is the total capacitance related of the pixel electrode  3024 . The C lc ( 3020 ) is the capacitance of the liquid crystal capacitor  3020 . The C st ( 3016 ) is the capacitance of the storage capacitor  3016 . The C gs ( 3028 ) is the capacitance of the parasitical capacitor  3028 . 
         [0106]    During the time segment T 6 , the electric potential variation of the pixel electrode  3022 , ΔV( 3022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     3022 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         3026 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         3022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         4 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         3014 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         3022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (3022)= C   lc (3018)+ C   st (3014)+ C   gs (3026) 
         [0107]    The C T ( 3022 ) is the total capacitance related to the pixel electrode  3022 . The C lc ( 3018 ) is the capacitance of the liquid crystal capacitor  3018 . The C st ( 3014 ) is the capacitance of the storage capacitor  3014 . The C gs ( 3026 ) is the capacitance of the parasitical capacitor  3026 . 
         [0108]    The foregoing application of the drive waveform illustrated in  FIG. 10  is based on the pixel unit  300  of the first embodiment in  FIG. 3 . However, it is noticed that the drive waveform illustrated in  FIG. 10  also be used in the pixel unit  400  of the second embodiment in  FIG. 4 , in the pixel unit  500  of the third embodiment in  FIG. 5  and in the pixel unit  600  of the fourth embodiment in  FIG. 6 . 
         [0109]      FIG. 11  illustrates the three-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 11  and  FIG. 5  together. In this embodiment, the drive waveform includes three electric potentials, V 1 , V 2  and V 3 . The relationship among the three electric potential is V 1 &gt;V 2 &gt;V 3 . The left part of  FIG. 11  illustrates the corresponding waveform in the even frame. The right part of  FIG. 11  illustrates the corresponding waveform in the odd frame. 
         [0110]    During the time segment T 1  of the even frame, the scanning line  5006  is selected. At this time, a negative polarity data is transferred in the data line  5008 . The electric potential of the gate electrodes of the thin film transistors  5010  and  5012  is increased to V 1  to turn on the thin film transistor  5010  and  5012 . The data in the data line  5008  is transferred to the pixel electrode  5022  through the thin film transistor  5010 . The data in the data line  5008  is transferred to the pixel electrode  5024  through the thin film transistor  5012 . When the time segment T 1  is almost over, the pixel electrodes  5022  and  5024  have the same electric potential. During the time segment T 2 , the electric potential applied to the scanning line  5006  is reduced to the electric potential V 3  to turn off the thin film transistor  5010  and  5012 . Therefore, the two pixel electrodes are isolated. 
         [0111]    On the other hand, the scanning line  5006  is coupled to the pixel electrode  5022  through the parasitical capacitors  5026 . The scanning line  5006  is coupled to the pixel electrode  5024  through the parasitical capacitors  5028 . Therefore, the electric potential of the pixel electrodes  5022  and  5024  is affected by the electric potential variation (V 1 -V 3 ) of the scanning line  5006  during the time segment T 2 . 
         [0112]    Moreover, the scanning line  5002  is coupled to the pixel electrode  5022  through the storage capacitors  5014 . The scanning line  5002  is coupled to the pixel electrode  5024  through the storage capacitors  5016 . Therefore, the electric potentials of the pixel electrodes  5022  and  5024  are also affected by the electric potential variation of the scanning line  5002 . During the time segment T 2 , the electric potential of the scanning line  5002  is changed from electric potential V 2  to electric potential V 3 . The reduced electric potential variation (V 2 -V 3 ) of the scanning line  5002  is coupled to the pixel electrodes  5022  and  5024 . The electric potentials of the pixel electrodes  5022  and  5024  are separated by modifying the capacitance of the storage capacitors  5014  and  5016 . The different electric potential value forms different Gamma curves to reach the Half-tone effect. The coupling effect of the scanning lines reduces the electrical potential output range of the data line to reduce the power. 
         [0113]    During the time segment T 2 , the electric potential variation of the pixel electrode  5024 , ΔV( 5024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5024 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5028 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                       
                       ) 
                     
                   
                   + 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5016 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5024)= C   lc (5020)+ C   st (5016)+ C   gs (5028) 
         [0114]    The C T ( 5024 ) is the total capacitance related to the pixel electrode  5024 . The C lc ( 5020 ) is the capacitance of the liquid crystal capacitor  5020 . The C lc ( 5016 ) is the capacitance of the storage capacitor  5016 . The C gs ( 5028 ) is the capacitance of the parasitical capacitor  5028 . 
         [0115]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5016 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5024 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5024  because of the coupling effect from the scanning line  5002 . 
         [0116]    During the time segment T 2 , the electric potential variation of the pixel electrode  5022 , ΔV( 5022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5022 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         5026 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         5014 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5022)= C   lc (5018)+ C   st (5014)+ C   gs (5026) 
         [0117]    The C T ( 5022 ) is the total capacitance related to the pixel electrode  5022 . The C lc ( 5018 ) is the capacitance of the liquid crystal capacitor  5018 . The C st ( 5014 ) is the capacitance of the storage capacitor  5014 . The C gs ( 5026 ) is the capacitance of the parasitical capacitor  5026 . 
         [0118]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5022  because of the coupling effect from the scanning line  5002 . 
         [0119]    In the odd frame, positive polarity data is transferred in the data line  5008 . Please refer to  FIG. 11  and  FIG. 5  together. The main difference between the odd frame and the even frame is described in the following. During the time segment T 2  of the even frame, the drive waveform for driving the scanning line  5002  is pulled down to the lowest electric potential V 3  from the electric potential V 2 . Such a driving waveform increases the absolute value of the electric potential variation in the pixel electrodes  5022  and  5024  caused by the electric potential variation (V 1 -V 3 ) of the scanning line  5006 . 
         [0120]    However, the drive waveform in the odd frame is different from the drive waveform in the even frame. During the time segment T 4  of the odd frame, the drive waveform for driving the scanning line  5006  is pulled down to the electric potential V 2  from the electric potential V 1  to turn off the thin film transistor  5010  and  5012 . The drive waveform for driving the scanning line  5002  is pulled up to the electric potential V 2  from the electric potential V 3 . Such drive waveforms increase the absolute value of the electric potential variation in the pixel electrodes  5022  and  5024  caused by the electric potential variation (V 1 -V 2 ) of the scanning line  5006 . 
         [0121]    During the time segment T 4 , the electric potential variation of the pixel electrode  5024 , ΔV( 5024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5024 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5028 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5016 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5024)= C   lc (5020)+ C   st (5016)+ C   gs (5028) 
         [0122]    The C T ( 5024 ) is the total capacitance related to the pixel electrode  5024 . The C lc ( 5020 ) is the capacitance of the liquid crystal capacitor  5020 . The C st ( 5016 ) is the capacitance of the storage capacitor  5016 . The C gs ( 5028 ) is the capacitance of the parasitical capacitor  5028 . 
         [0123]    During the time segment T 4 , the electric potential variation of the pixel electrode  5022 , ΔV( 5022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5022 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5026 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5014 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and, and 
         [0000]        C   T (5022)= C   lc (5018)+ C   st (5014)+ C   gs (5026) 
         [0124]    The C T ( 5022 ) is the total capacitance related to the pixel electrode  5022 . The C lc ( 5018 ) is the capacitance of the liquid crystal capacitor  5018 . The C st ( 5014 ) is the capacitance of the storage capacitor  5014 . The C gs ( 5026 ) is the capacitance of the parasitical capacitor  5026 . 
         [0125]    The foregoing application of the drive waveform illustrated in  FIG. 11  is based on the pixel unit  500  of the first embodiment in  FIG. 5 . However, it is noticed that the drive waveform illustrated in  FIG. 11  also be used in the pixel unit  600  of the fourth embodiment in  FIG. 6 . 
         [0126]      FIG. 12  illustrates the four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 12  and  FIG. 5  together. In this embodiment, the drive waveform includes four electric potentials, V 1 , V 2 , V 3  and V 4 . The relationship among the three electric potential is V 1 &gt;V 2 &gt;V 3 &gt;V 4 . Due to the coupling effect of the scanning line  5002 , the output power of the data line is reduced. When the four-level drive waveform is applied to the pixel unit in the  FIG. 5 , the electrical potential of the pixel is increase or reduced by the coupling effect of the scanning line  5002 . Such coupling reduces the electrical potential output range of the data line to reduce the power. The left part of  FIG. 12  illustrates the corresponding waveform in the even frame. The right part of  FIG. 12  illustrates the corresponding waveform in the odd frame. 
         [0127]    During the time segment T 1  of the even frame, the scanning line  5006  is selected. The electric potential of the scanning line  5002  is pulled down to the electric potential V 2 . At this time, a negative polarity data is transferred in the data line  5008 . The electric potentials of the gate electrodes of the thin film transistors  5010  and  5012  are increased to V 1  to turn on the thin film transistors  5010  and  5012 . The data in the data line  5008  is transferred to the pixel electrode  5022  through the thin film transistor  5010 . The data in the data line  5008  is transferred to the pixel electrode  5024  through the thin film transistor  5012 . When the time segment T 1  is almost over, the pixel electrodes  5022  and  5024  have the same electric potential. During the time segment T 2 , the electric potential on the scanning line  5006  is pulled down to the electric potential V 4  to turn off the thin film transistor  5010  and  5012 . At this moment, the electric potential on the scanning line  5002  is pulled down from the electric potential V 2  to the electric potential V 3 . 
         [0128]    On the other hand, the scanning line  5006  is coupled to the pixel electrode  5022  through the parasitical capacitor  5026 . The scanning line  5006  is coupled to the pixel electrode  5024  through the parasitical capacitor  5028 . Therefore, the electric potentials of the pixel electrodes  5022  and  5024  are affected by the electric potential variation (V 1 -V 4 ) of the scanning line  5006  during the time segment T 2 . 
         [0129]    Moreover, the scanning line  5002  is coupled to the pixel electrode  5022  through the storage capacitors  5014 . The scanning line  5002  is coupled to the pixel electrode  5024  through the storage capacitors  5016 . Therefore, the electric potential of the pixel electrodes  5022  and  5024  is also affected by the electric potential variation of the scanning line  5002 . The electric potentials of the pixel electrodes  5022  and  5024  are separated by modifying the capacitance of the storage capacitors  5014  and  5016 . The different electric potential value forms different Gamma curves to reach the Half-tone effect. 
         [0130]    During the time segment T 2 , the electric potential variation of the pixel electrode  5024 , ΔV( 5024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5024 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5028 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                   + 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5016 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5024)= C   lc (5020)+ C   st (5016)+ C   gs (5028) 
         [0131]    The C T ( 5024 ) is the total capacitance related to the pixel electrode  5024 . The C lc ( 5020 ) is the capacitance of the liquid crystal capacitor  5020 . The C st ( 5016 ) is the capacitance of the storage capacitor  5016 . The C gs ( 5028 ) is the capacitance of the parasitical capacitor  5028 . 
         [0132]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5016 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5024 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5024  because of the coupling effect from the scanning line  5002 . 
         [0133]    During the time segment T 2 , the electric potential variation of the pixel electrode  5022 , ΔV( 5022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5022 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         5026 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         4 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         5014 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5022)= C   lc (5018)+ C   st (5014)+ C   gs (5026) 
         [0134]    The C T ( 5022 ) is the total capacitance related to the pixel electrode  5022 . The C lc ( 5018 ) is the capacitance of the liquid crystal capacitor  5018 . The C st ( 5014 ) is the capacitance of the storage capacitor  5014 . The C gs ( 5026 ) is the capacitance of the parasitical capacitor  5026 . 
         [0135]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5022  because of the coupling effect from the scanning line  5002 . 
         [0136]    In the odd frame, positive polarity data is transferred in the data line  5008 . Please refer to  FIG. 12  and  FIG. 5  together. During the time segment T 3  of the odd frame, the drive waveform for driving the scanning line  5002  is pulled down to the electric potential V 4 . The drive waveform for driving the scanning line  5006  is pulled up to the electric potential V 1  to turn on the thin film transistors  5010  and  5012 . The data in the data line  5008  is transferred to the pixel electrode  5022  through the thin film transistor  5010 . The data in the data line  5008  is transferred to the pixel electrode  5024  through the thin film transistor  5012 . When the time segment T 3  is almost over, the pixel electrodes  5022  and  5024  have the same electric potential. 
         [0137]    During the time segment T 4 , the electric potential on the scanning line  5006  is pulled down to the electric potential V 2  to turn off the thin film transistor  5010  and  5012 . At this moment, the electric potential on the scanning line  5002  is pulled up from the electric potential V 4  to the electric potential V 3 . The scanning line  5002  is coupled to the pixel electrode  5022  through the storage capacitor  5014 . The scanning line  5002  is coupled to the pixel electrode  5024  through the storage capacitor  5016 . Therefore, the electric potentials of the pixel electrodes  5022  and  5024  are affected by the electric potential variation (V 3 -V 4 ) of the scanning line  5002 . The electric potentials of the pixel electrodes  5022  and  5024  are separated by modifying the capacitance of the storage capacitors  5014  and  5016 . The different electric potential value forms different Gamma curves to reach the Half-tone effect. The advantage of using the four level drive waveform is that the electrical potential output range of the data line is reduced to reduce the power. 
         [0138]    During the time segment T 4 , the electric potential variation of the pixel electrode  5024 , ΔV( 5024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5024 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5028 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5016 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5024)= C   lc (5020)+ C   st (5016)+ C   gs (5028) 
         [0139]    The C T ( 5024 ) is the total capacitance related to the pixel electrode  5024 . The C lc ( 5020 ) is the capacitance of the liquid crystal capacitor  5020 . The C st ( 5016 ) is the capacitance of the storage capacitor  5016 . The C gs ( 5028 ) is the capacitance of the parasitical capacitor  5028 . 
         [0140]    During the time segment T 4 , the electric potential variation of the pixel electrode  5022 , ΔV( 5022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5022 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5026 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5014 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and, and 
         [0000]        C   T (5022)= C   lc (5018)+ C   st (5014)+ C   gs (5026) 
         [0141]    The C T ( 5022 ) is the total capacitance related to the pixel electrode  5022 . The C lc ( 5018 ) is the capacitance of the liquid crystal capacitor  5018 . The C st ( 5014 ) is the capacitance of the storage capacitor  5014 . The C gs ( 5026 ) is the capacitance of the parasitical capacitor  5026 . 
         [0142]    The foregoing application of the drive waveform illustrated in  FIG. 11  is based on the pixel unit  500  of the third embodiment in  FIG. 5 . However, it is noticed that the drive waveform illustrated in  FIG. 11  also is used in the pixel unit  600  of the fourth embodiment in  FIG. 6 . 
         [0143]      FIG. 13  illustrates the two-step four-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 13  and  FIG. 5  together. In this embodiment, the drive waveform includes four electric potential, V 1 , V 2 , V 3  and V 4 . The relationship among the four electric potential is V 1 &gt;V 2 &gt;V 3 &gt;V 4 . In the two-step four-level drive waveform, the waveform transition is always generated by the electric potential V 3  to the destination electric potential. Such transitions avoid the problems cause by data errors due to the time delay and non-uniform drive waveform. The left part of  FIG. 13  illustrates the corresponding waveform in the even frame. The right part of  FIG. 13  illustrates the corresponding waveform in the odd frame. 
         [0144]    During the time segment T 1  of the even frame, the electric potential of the scanning line  5002  is first pulled down to the electric potential V 3 , then pulled up to the electric potential V 2 . The electric potential of the scanning line  5006  is pulled up to the electric potential V 1  to turn on the thin film transistors  5010  and  5012 . The data in the data line  5008  is transferred to the pixel electrode  5022  through the thin film transistor  5010 . The data in the data line  5008  is transferred to the pixel electrode  5024  through the thin film transistor  5012 . When the time segment T 1  is almost over, the pixel electrodes  5022  and  5024  have the same electric potential. During the time segment T 2 , the electric potential on the scanning line  5006  is first pulled down to the electric potential V 3 , then, pulled down to the electric potential V 4  to turn off the thin film transistors  5010  and  5012 . 
         [0145]    On the other hand, the scanning line  5006  is coupled to the pixel electrodes  5022  and  5024  through the parasitical capacitors  5026  and  5028  respectively. Therefore, the electric potentials of the pixel electrodes  5022  and  5024  are affected by the electric potential variation (V 1 -V 4 ) of the scanning line  5006  during the time segment T 2 . In this time segment T 3 , the electric potential of the scanning line  5002  is pulled down to the electric potential V 3  from the electric potential V 2 . 
         [0146]    The scanning line  5002  is coupled to the pixel electrode  5022  through the storage capacitors  5014 . The scanning line  5002  is coupled to the pixel electrode  5024  through the storage capacitor  5016 . Therefore, the electric potentials of the pixel electrodes  5022  and  5024  are affected by the electric potential variation (V 2 -V 3 ) of the scanning line  5002 . The electric potential variation (V 2 -V 3 ) of the scanning line  5002  is coupled to the pixel electrodes  5022  and  5024  to increase the absolute value of the electric potential of the pixel electrodes  5022  and  5024 . Such variation separates the electric potential value between the pixel electrodes  5022  and  5024 . The different electric potential value between the pixel electrodes  5022  and  5024  forms different Gamma curves to reach the Half-tone effect. 
         [0147]    During the time segment T 3 , the electric potential variation of the pixel electrode  5024 , ΔV( 5024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5024 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         5028 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5024 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         4 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         5016 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5024 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5024)= C   lc (5020)+ C   st (5016)+ C   gs (5028) 
         [0148]    The C T ( 5024 ) is the total capacitance related to the pixel electrode  5024 . The C lc ( 5020 ) is the capacitance of the liquid crystal capacitor  5020 . The C st ( 5016 ) is the capacitance of the storage capacitor  5016 . The C gs ( 5028 ) is the capacitance of the parasitical capacitor  5028 . 
         [0149]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5016 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5024 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5024  because of the coupling effect from the scanning line  5002 . 
         [0150]    During the time segment T 2 , the electric potential variation of the pixel electrode  5022 , ΔV( 5022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5022 
                     ) 
                   
                 
               
               = 
               
                 
                   
                     
                       
                         C 
                         gs 
                       
                        
                       
                         ( 
                         5026 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         1 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         4 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     
                       
                         C 
                         st 
                       
                        
                       
                         ( 
                         5014 
                         ) 
                       
                     
                     
                       
                         C 
                         T 
                       
                        
                       
                         ( 
                         5022 
                         ) 
                       
                     
                   
                    
                   
                     ( 
                     
                       
                         V 
                          
                         
                             
                         
                          
                         2 
                       
                       - 
                       
                         V 
                          
                         
                             
                         
                          
                         3 
                       
                     
                     ) 
                   
                 
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5022)= C   lc (5018)+ C   st (5014)+ C   gs (5026) 
         [0151]    The C T ( 5022 ) is the total capacitance related to the pixel electrode  5022 . The C lc ( 5018 ) is the capacitance of the liquid crystal capacitor  5018 . The C st ( 5014 ) is the capacitance of the storage capacitor  5014 . The C gs ( 5026 ) is the capacitance of the parasitical capacitor  5026 . 
         [0152]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   2 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5022  because of the coupling effect from the scanning line  5002 . 
         [0153]    In the odd frame of  FIG. 13 , positive polarity data is transferred in the data line  5008 . Please refer to  FIG. 13  and  FIG. 5  together. During the time segment T 4  of the odd frame, the drive waveform for driving the scanning line  5006  is pulled up to the electric potential V 1  to turn on the thin film transistors  5010  and  5012 . The electric potential of the scanning line  5002  is fist pulled down to the electric potential V 3 , then, pulled down to the electric potential V 4 . During the time segment T 5  of the odd frame, the drive waveform for driving the scanning line  5006  is pulled down to the electric potential V 3 , then, pulled up to the electric potential V 2  to turn off the thin film transistor  5010  and  5012 . At this time, an electric potential variation (V 1 -V 2 ) is generated on the scanning line  506 . The pixel electrode  5022  is isolated to the pixel electrode  5024 . During the time segment T 6 , the drive waveform for driving the scanning line  5002  is pulled up to the electric potential V 3  to generate an electric potential variation (V 3 -V 4 ). The electric potential variation (V 3 -V 4 ) of the scanning line  5002  is coupled to the pixel electrodes  5022  and  5024  to increase the absolute value of the electric potential variation of the pixel electrodes  5022  and  5024 . Such variation separates the electric potential value between the pixel electrodes  5022  and  5024 . The different electric potential value between the pixel electrodes  5022  and  5024  forms different Gamma curves to reach the Half-tone effect. The advantage of using a four-level drive waveform is that more parameters are used to change the electric potential of the pixel electrodes  5022  and  5024 . Therefore, more electric potential difference variation between the pixel electrodes  5022  and  5024  is obtained to improve the color performance of the liquid crystal display. 
         [0154]    During the time segment T 6 , the electric potential variation of the pixel electrode  5024 , ΔV( 5024 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5024 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5028 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5016 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5024 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5024)= C   lc (5020)+ C   st (5016)+ C   gs (5028) 
         [0155]    The C T ( 5024 ) is the total capacitance related to the pixel electrode  5024 . The C lc ( 5020 ) is the capacitance of the liquid crystal capacitor  5020 . The C st ( 5016 ) is the capacitance of the storage capacitor  5016 . The C gs ( 5028 ) is the capacitance of the parasitical capacitor  5028 . 
         [0156]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5016 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5024 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   4 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5024  because of the coupling effect from the scanning line  5002 . 
         [0157]    The electric potential variation of the pixel electrode  5022 , ΔV( 5022 ), is described in the following: 
         [0000]    
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                    
                   
                     ( 
                     5022 
                     ) 
                   
                 
               
               = 
               
                  
                 
                   
                     
                       
                         
                           C 
                           gs 
                         
                          
                         
                           ( 
                           5026 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           1 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           2 
                         
                       
                       ) 
                     
                   
                   - 
                   
                     
                       
                         
                           C 
                           st 
                         
                          
                         
                           ( 
                           5014 
                           ) 
                         
                       
                       
                         
                           C 
                           T 
                         
                          
                         
                           ( 
                           5022 
                           ) 
                         
                       
                     
                      
                     
                       ( 
                       
                         
                           V 
                            
                           
                               
                           
                            
                           3 
                         
                         - 
                         
                           V 
                            
                           
                               
                           
                            
                           4 
                         
                       
                       ) 
                     
                   
                 
                  
               
             
             , 
           
         
       
     
         [0000]    and 
         [0000]        C   T (5022)= C   lc (5018)+ C   st (5014)+ C   gs (5026) 
         [0158]    The C T ( 5022 ) is the total capacitance related to the pixel electrode  5022 . The C lc ( 5018 ) is the capacitance of the liquid crystal capacitor  5018 . The C st ( 5014 ) is the capacitance of the storage capacitor  5014 . The C gs ( 5026 ) is the capacitance of the parasitical capacitor  5026 . 
         [0159]    Moreover, the 
         [0000]    
       
         
           
             
               
                 
                   C 
                   st 
                 
                  
                 
                   ( 
                   5014 
                   ) 
                 
               
               
                 
                   C 
                   T 
                 
                  
                 
                   ( 
                   5022 
                   ) 
                 
               
             
              
             
               ( 
               
                 
                   V 
                    
                   
                       
                   
                    
                   3 
                 
                 - 
                 
                   V 
                    
                   
                       
                   
                    
                   4 
                 
               
               ) 
             
           
         
       
     
         [0000]    is the electric potential variation value of the pixel electrode  5022  because of the coupling effect from the scanning line  5002 . 
         [0160]    The foregoing application of the drive waveform illustrated in  FIG. 12  is based on the pixel unit  500  of the third embodiment in  FIG. 5 . However, it is noticed that the drive waveform illustrated in  FIG. 12  also be used in the pixel unit  600  of the fourth embodiment in  FIG. 6 . 
         [0161]      FIG. 14  illustrates the two-level drive waveform and the electric potential change of pixel electrodes according to an embodiment of the present invention. Please refer to  FIG. 14  and  FIG. 7  together. In this embodiment, the drive waveform includes two electric potentials, V 1  and V 2 . The relationship between the two electric potentials is V 1 &gt;V 2 . As described in the foregoing, the two thin film transistors  7010  and  7022  have different design specifications. Based on the different design specifications, the two thin film transistors  7010  and  7022  have different charge capacity. Therefore, the electric potential of the pixel electrodes  7016  and  7018  can be separated. The left part of  FIG. 14  illustrates the corresponding waveform in the even frame. The right part of  FIG. 14  illustrates the corresponding waveform in the odd frame. 
         [0162]    During the time segment T 1  of the even frame. The electric potential of the scanning line  7006  is pulled up to the electric potential V 1  to turn on the thin film transistors  7010  and  7022 . The data in the data line  7008  is transferred to the pixel electrode  7028  through the thin film transistor  7022  and the thin film transistor  7010 . The data in the data line  7008  is transferred to the pixel electrode  7016  through the thin film transistor  7010 . Because of the different charge capacity of the thin film transistors  7010  and  7022 , the electric potentials of the pixel electrodes  7016  and  7028  are different. During the time segment T 2 , the electric potential on the scanning line  7006  is pulled down to the electric potential V 2  to turn off the thin film transistor  7010  and  7022 . Therefore, the pixel electrode  7016  is isolated to the pixel electrode  7028 . 
         [0163]    In the odd frame of  FIG. 14 , positive polarity data is transferred in the data line  7008 . Please refer to  FIG. 14  and  FIG. 7  together. During the time segment T 3 , the drive waveform for driving the scanning line  7006  is pulled up to the electric potential V 1  to turn on the thin film transistors  7010  and  7022 . The data in the data line  7008  is transferred to the pixel electrode  7028  through the thin film transistor  7022 . The data in the data line  7008  is transferred to the pixel electrode  7016  through the thin film transistor  7010 . Because of the different charge capacity of the thin film transistors  7010  and  7022 , the electric potentials of the pixel electrodes  7016  and  7028  are different. During the time segment T 4 , the electric potential on the scanning line  7006  is pulled down to the electric potential V 2  to turn off the thin film transistor  7010  and  7022 . Therefore, the pixel electrode  7016  is isolated to the pixel electrode  7028 . 
         [0164]    Accordingly, a pixel unit in the present invention is divided into two sub-pixels. Each sub-pixel includes a thin film transistor, a liquid crystal capacitor and a storage capacitor. The two sub-pixels generate different pixel voltage to compensate to each other to release the color shift phenomenon. 
         [0165]    As is understood by a person skilled in the art, the foregoing descriptions of the preferred embodiment of the present invention are an illustration of the present invention rather than a limitation thereof. Various modifications and similar arrangements are included within the spirit and scope of the appended claims. The scope of the claims should be accorded to the broadest interpretation so as to encompass all such modifications and similar structures. While a preferred embodiment of the invention has been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention.