Abstract:
The electro-optic device includes a plurality of data lines, a plurality of scan lines, a plurality of pixel areas arranged at crossings of the data lines and the scan lines, and light emitting elements, wherein first pixel areas are in alternating columns, each first pixel area including only one pixel circuit configured to cause the light emitting elements to emit light, wherein second pixel areas are in alternating columns between the first pixel areas, each second pixel area including two pixel circuits configured to cause the light emitting elements to emit light, and wherein a writing process is performed on the second pixel areas to cause light emitting elements on the pixel circuits on one side to emit light in a period for causing light emitting elements on the pixel circuits on the other side to emit light.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims under 35 U.S.C. §119 priority to and the benefit of Japan Patent Application No. 2011-227597, filed in the Japan Intellectual Property Office on Oct. 17, 2011, the entire contents of which are incorporated herein by reference. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    Example embodiments relate to an electro-optic device and a driving method of an electro-optic device. 
         [0004]    2. Description of the Related Art 
         [0005]    In general, a liquid crystal display having a transmissive or semi-transmissive reflective liquid crystal panel or an organic EL display having an organic EL display panel including an organic EL element panel is widely used as a display of a television set. Such a display has a demand for fast driving of a pixel circuit in line with the recent trend of higher resolution and three-dimensional image display. 
         [0006]    In order to allow an image displayed by a display device to be perceived by a user, a shutter glass including a polarization element, such as liquid crystal, may be used. The shutter glass opens and closes the shutter in synchronization with a timing at which an AMOLED panel changes and displays an image for the left and right eyes during 1 frame (60 Hz), and presents a displayed image only to the appropriate eye. 
         [0007]    If the panel is made to emit light in a period in which the opening and closing of the shutters are not complete, two left and right images appear to be mixed. Due to this, the panel is in an off mode in which no image is displayed, during the period in which the opening and closing of the shutters are not complete, and all the pixels of the panel simultaneously emit light after one of the shutters is opened. Accordingly, it is possible to attain display quality without the so-called “3D crosstalk” by which the left-eye and right-eye images do not appear to be mixed at all. 
         [0008]    For example, a first conventional electro-optic device may include a light emitting element and a pixel circuit having a pixel voltage sustaining and current control circuit in the pixel area of a pixel. The pixel may be installed at a crossing point of a scan line and a data signal line. The light emitting element is an element which self-emits light depending on an amount of current when current flows. 
         [0009]    When LOW voltage is applied to the scan line, a pixel circuit including a PMOSFET is synchronized with the timing at which a pixel switch is turned on, and a capacitor is updated as it is charged with a pixel voltage based on image data from the data signal line. Afterwards, when HIGH voltage is applied to the scan line, the pixel switch is turned OFF and the pixel voltage is maintained. After completing the update of data of all the pixels, when a light emitting switch is turned on by applying LOW voltage to a light emission control line of all the pixels simultaneously, the light emitting element emits light by a current flowing from an anode power line to a cathode power line. 
         [0010]    To eliminate the above-mentioned 3D crosstalk, the first conventional electro-optic device rewrites the previous pixel voltage of the panel by conducting linear sequential scanning based on left-eye image data during the non-emission period corresponding to a half period, and causes the pixels to emit light and display the left-eye image after completion of the rewriting of the previous pixel voltage. A pixel voltage based on image data is charged in the data signal line while a predetermined signal is being applied to the scan line sequentially, starting from the first row, and the light emitting switch is turned on by a control signal for turning the light emitting switch on, thereby causing the screen to emit light. 
         [0011]    Likewise, the first conventional electro-optic device rewrites a previous pixel voltage on the panel by conducting linear sequential scanning based on right-eye image data during the non-emission period of the next subframe, and causes the pixels to emit light and display the left-eye image after completion of the rewriting of the previous pixel voltage. 
         [0012]    In the above example, the previous pixel is updated in a period of nearly a quarter of 1 frame. However, if the screen has higher resolution and larger size, it may be difficult to ensure a sufficient period for updating each pixel with display data. 
         [0013]    In another example, a second conventional electro-optic device may include a light emitting element and two pixel circuits having a pixel voltage sustaining and current control circuit in the pixel area of a pixel. The pixel may be surrounded by scan lines, a data signal, and an anode power line at a crossing point of a scan line and a data signal line. The second conventional electro-optic device can sustain left and right pixel voltages, respectively, by means of the two pixel circuits within one pixel. 
         [0014]    A display data of a right-eye image can be written on the pixel circuit during the emission and display period of a left-eye image kept at the pixel voltage of the pixel circuit. More specifically, in the second conventional electro-optic device, the pixel voltage is updated by linear sequential driving based on the image data of the current frame, after completion of the emission period of the previous frame. The pixel voltage can be updated based on the image data of the current frame, starting from a second emission period of the previous frame, and a period of time lasting until the completion of a first non-emission period can be allocated to a display data update period. 
         [0015]    A period of time consumed only for an emission operation in the electro-optic device is added to the existing data update period during non-emission of the second conventional electro-optic device. Accordingly, the total data update period of the second conventional electro-optic device is substantially twice that of the first electro-optic device. The second electro-optic device can have a significant effect against a lack of the data update period. However, the second conventional electro-optic device having a plurality of pixel circuits installed for each pixel has the problem of low productivity because of a significant increase in the number of circuit elements per pixel, and a bottom emission type AMOLED having no pixel circuit and configured to transmit light from an aperture has the problem of low aperture ratio. 
       SUMMARY 
       [0016]    Example embodiments have been made in an effort to provide a novel and improved electro-optic device, which secures a sufficient period for charging each pixel and suppresses a decrease in aperture ratio even if the screen has higher resolution and larger size, and a driving method of the same. 
         [0017]    An exemplary embodiment provides an electro-optic device which includes a plurality of pixel areas at intersections of a plurality of data lines and scan lines, and a plurality of light emitting elements, the light emitting elements being configured to emit light for a predetermined period of time in all the pixel areas during an emission period of a frame and configured not to emit light during a non-emission period of the frame, wherein first pixel areas are in alternating columns, each first pixel area including only one pixel circuit configured to cause the light emitting elements to emit light, wherein second pixel areas are in alternating columns between the first pixel areas, each second pixel area including two pixel circuits configured to cause the light emitting elements to emit light, and wherein a writing process is performed on the second pixel areas to cause light emitting elements on the pixel circuits on one side to emit light in a period for causing light emitting elements on the pixel circuits on the other side to emit light. 
         [0018]    The pixel circuits on one side of each of the pixel areas each including two pixel circuits may be physically divided. 
         [0019]    The divided pixel circuits may be positioned at some part of the pixel areas each including only one pixel circuit. 
         [0020]    The emission period and the non-emission period may be repeated twice in 1 frame. 
         [0021]    The emission period and the non-emission period may have the same length or different lengths. 
         [0022]    Another embodiment provides a driving method of an electro-optic device which includes a plurality of data lines, a plurality of scan lines, and a plurality of pixel areas arranged at crossings of the data lines and the scan lines and including light emitting elements, in which a frame includes an emission period in which the light emitting elements emit light in all the pixel areas for a predetermined period of time and a non-emission period in which the light emitting elements do not emit light, and in which pixel areas each including only one pixel circuit for causing the light emitting elements to emit light are installed ever other line, and pixel areas each including two pixel circuits for causing the light emitting elements to emit light are installed every other line in rows between the pixel areas each including one pixel circuit, wherein the method includes: the first step in which the light emitting elements supplying no current to the light emitting elements perform a writing process on the pixel areas each including two pixel circuits to cause the light emitting elements to emit light in the emission period in which the light emitting elements emit light; and the second step in which the pixel circuits perform a writing process on the pixel areas each including one pixel circuit to cause the light emitting elements to emit light in the non-emission period in which the light emitting elements do not emit light. 
         [0023]    The emission period and the non-emission period may be repeated twice in 1 frame. 
         [0024]    The emission period and the non-emission period may have the same length or different lengths. 
         [0025]    If the emission period is longer than the non-emission period, the first step may be performed only during the non-emission period. 
         [0026]    As described above, according to the example embodiments, an improved electro-optic device and a driving method thereof can be provided, which secures a sufficient period for charging each pixel and suppresses a decrease in aperture ratio even if the screen has higher resolution and larger size. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0027]      FIG. 1  is a view showing the configuration of an electro-optic device according to an exemplary embodiment. 
           [0028]      FIG. 2  is a view showing an example of the specific circuit configuration of pixels of the electro-optic device according to an exemplary embodiment. 
           [0029]      FIG. 3  is a view showing the panel driving timing of the electro-optic device according to an exemplary embodiment. 
           [0030]      FIG. 4  is a view showing the driving of shutter glass when a three-dimensional image is displayed by the electro-optic device according to an exemplary embodiment. 
           [0031]      FIG. 5  is a view showing a circuit block incorporating a panel, which is included in the electro-optic device according to an exemplary embodiment. 
           [0032]      FIG. 6  is a view showing the timing chart of a control signal for a pixel circuit of the electro-optic device of  FIG. 1  according to an exemplary embodiment. 
           [0033]      FIG. 7  is a view showing a required maintenance time of display data in the electro-optic device according to an exemplary embodiment. 
           [0034]      FIG. 8  is a view showing another example of the panel driving timing of the electro-optic device according to an exemplary embodiment. 
           [0035]      FIG. 9  is a view showing yet another example of the panel driving timing of the electro-optic device according to an exemplary embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0036]    Hereinafter, an exemplary embodiment will be described in detail with reference to the accompanying drawings. Also, in the specification and drawings, components having substantially the same functions are denoted by the same reference numerals, and a repeated explanation thereof will not be given. 
         [0037]    First, an example of the configuration of an electro-optic device according to an exemplary embodiment will be described with reference to the drawings. 
         [0038]      FIG. 1  is a view showing the configuration of an electro-optic device  100  according to an exemplary embodiment. 
         [0039]    As shown in  FIG. 1 , the electro-optic device  100  according to an exemplary embodiment includes scan lines  140   a ,  140   b , and  140   c , a data signal line  141 , an anode power line  142 , and pixels  130   a  and  130   b  indicated by broken lines and arranged alternately every other line. The pixels  130   a  and  130   b  each include a pixel circuit  120   a  and a light emitting element  121   a  and  121   b.    
         [0040]    The light emitting element  121   a  and  121   b  is an element which self-emits light depending on amount of current when current flows. The pixel circuit  120   a  includes a pixel voltage sustaining and current control circuit for causing the light emitting element  121   a  to emit light. The pixel circuit  120   b , as well as the pixel circuit  120   a , is connected to the light emitting element  121   a  provided for each pixel  130   a . The pixel circuit  120   b  consists of pixel circuits  120   c  and  120   d , and the pixel circuits  120   c  and  120   d  are formed by dividing the pixel circuit  120   b  in two. The pixel circuit  120   c  is included in the pixel  130 , and the pixel circuit  120   d  extends across the pixel  130   b . The pixel circuits  120   c  and  120   d  constituting the pixel circuit  120   b  are divided, e.g., separated, from each other so that the light emitting element  121   a  is disposed at equal intervals at upper and lower pixels  130 . 
         [0041]    Accordingly, the pixel circuit  120   a  and the pixel circuit  120   b  have the same function as an electrical circuit, and the positional relationship between a light emitting element and a pixel circuit is not limited to the above-mentioned example. In any case, the pixel circuit  120   a  and the pixel circuit  120   b  are connected to the light emitting element  121   a , and each can update and maintain the pixel voltage independently. The pixel circuit  120   a  included in the pixel  130   b  is connected only to the light emitting element  121   b.    
         [0042]    Although  FIG. 1  describes only the scan lines  140   a ,  140   b , and  140   c  for simplicity, a control line for independently controlling the pixel circuits  120   a  and  120   b  is added to the electro-optic device  100  according to an exemplary embodiment, as described below. 
         [0043]      FIG. 2  is a view showing an example of the specific circuit configuration of pixels  130   a  and  130   b  of the electro-optic device  100  according to an exemplary embodiment.  FIG. 2  illustrates light emission control lines  144   a ,  144   b , and  144   c  for independently controlling the pixel circuits  120   a  and  120   b.    
         [0044]    As shown in  FIG. 2 , when LOW voltage is applied to the scan lines  140   a ,  140   b , and  140   c , a pixel circuit including a PMOSFET is synchronized with the timing at which pixel switches  111   a ,  111   b , and  111   c  each are turned on, and capacitors  122   a ,  122   b , and  122   c  are refreshed as they are charged with a pixel voltage based on image data from the data signal line  141 . Afterwards, when HIGH voltage is applied to the scan lines  140   a ,  140   b , and  140   c , the pixel switches  111   a ,  111   b , and  111   c  are turned OFF and the pixel voltage is maintained. After completing the update of data of all the pixels, when light emission switches  112   a ,  112   b , and  112   c  are turned on by applying LOW voltage to the light emission control lines of all the previous pixels simultaneously, the light emitting elements  121   a ,  121   b , and  121   c  emit light by a current flowing from an anode power line  142  to a cathode power line  143 . 
         [0045]    The pixel circuits  120   a  and  120   b  are driven independently, and the turn on/off of the light emission switches  112   a  and  112   b  is controlled independently. In other words, when a pixel voltage is charged in the pixel circuit  120   a , the light emission switch  112   a  is turned on in an emission period, and when a pixel voltage is charged in the pixel circuit  120   b , the light emitting switch  112   b  is turned on in an emission period. 
         [0046]    As the pixel circuits  120   a  and  120   b  are thusly driven independently, the electro-optic device  100  according to an exemplary embodiment can update display data and secure an update time of the display data by charging a pixel voltage in the pixel circuit on one side while causing the light emitting element  130   a  to emit light with the pixel voltage maintained by the pixel circuit on the other side. 
         [0047]    The pixel circuit  120   b  is divided into two pixel circuits  120   c  and  120   d , as shown in  FIG. 1 , and may be divided into a capacitor  122   b  having a large circuit area and another element. 
         [0048]      FIG. 3  is a view showing the panel driving timing of the electro-optic device  100  according to an exemplary embodiment.  FIG. 4  is a view showing the driving of shutter glass when a three-dimensional image is displayed by the electro-optic device  100  according to an exemplary embodiment. 
         [0049]    In the electro-optic device  100  shown in  FIG. 1 , the pixel voltage of the panel is updated such that the left and right images alternate every subframe period of 120 Hz, as shown in  FIG. 3 . 
         [0050]    To eliminate the above-mentioned 3D crosstalk, the electro-optic device  100  rewrites the previous pixel voltage of the panel by conducting linear sequential scanning based on left-eye image data during the a half period of non-emission period, and causes the pixels to emit light and display the left-eye image after completion of the rewriting of the previous pixel voltage, as shown in  FIG. 3 . The broken lines indicated by reference numerals  201 ,  202 , and  203  schematically indicate the state of linear sequential scanning. 
         [0051]    Reference numeral  201  indicates the state of linear sequential scanning of the pixel circuit  120   a  of the pixel  130   a , reference numeral  202  indicates the state of linear sequential scanning of the pixel circuit  120   b  of the pixel  130   a , and reference numeral  203  indicates the state of linear sequential scanning of the pixel circuit  120   a  of the pixel  130   b . For example, light emission  1  indicates a display period of the left-eye image, and light emission  2  indicates a display period of the right-eye image. 
         [0052]    Each pixel in which display data is written by the linear sequential scanning indicated by reference numerals  201  and  203  emits light in a subsequent period of light emission  1 . Each pixel in which display data is written by the linear sequential scanning indicated by reference numerals  202  and  203  emits light in a subsequent period of light emission  2 . 
         [0053]    ‘Display data update period’ shown in the timing chart of  FIG. 3  is an update period of display data of either one of the pixel circuit  120   a  and the pixel circuit  120   b  included in the pixel  130   a  or an update period of display data of the pixel circuit  120   a  included in the pixel  130   b . For example, display data of the pixel circuit  120   a  cannot be updated while the pixel circuit  120   a  maintains the pixel voltage. 
         [0054]    This is because the displayed image is shattered. In this case, the pixel voltage is maintained in the pixel circuit  120   a , and the display data of the pixel circuit  120   b  is updated. 
         [0055]    In the period of light emission  2 , when LOW voltage is applied to the scan line  140 , the pixel circuit  120   a  of the pixel  130   a  is synchronized with the timing at which the pixel switch  111  is turned on, and the capacitor  122   a  is refreshed as it is charged with a pixel voltage based on left-eye image data from the data signal line  141 . Then, when HIGH voltage is applied to the scan line  140   a , the pixel switch  111   a  is turned OFF and the pixel voltage is maintained. Since the scan line  140   a  is installed horizontally in every two pixels, i.e., next to every other pixel, it is scanned every other line, e.g., every other odd-numbered line, and half of the previous pixel is updated. 
         [0056]    In a period of light emission  2 , LOW voltage is applied to the light emission control lines  144   b  and  144   c  to turn the light emission switches  112   b  and  112   c  on, thereby controlling the driving of the light emission devices  121   a  and  121 . 
         [0057]    In the previous frame, the display data of the pixel circuit  120   b  of the pixel  130   a  is updated in the following order. 
         [0058]    At least immediately after applying power to the panel, the previous pixel data is updated to a pixel voltage of black display when the light emission control switch is turned OFF. Continuously, at the completion timing of the period of light emission  2 , i.e., in the first non-emission period of the current frame, the pixel circuit  120   a  of the pixel  130   b  starts to update the pixel voltage based on the left-eye image data of the current frame. In the same manner as the scan line  140   a , the scan line  140   c  is scanned every other line, e.g., every other even-numbered line, and half of the previous pixel is updated under the same control. 
         [0059]    In the first non-emission period, HIGH voltage is applied to all the light emission control lines  144   a ,  144   b , and  144   c  to turn the light emission switches  112   a ,  112   b , and  112   c  off. LOW voltage is applied to the light emission control lines  144   a  and  144   c  at the timing at which all the pixel voltages of the pixel circuits  120   a  of the pixels  130   b  are updated, and the driving of the respective connected light emitting elements  121   a  and  121   b  are controlled by the maintained voltage of the pixel circuit  120   a  of the pixel  130   a  and of the pixel circuit  120   a  of the pixel  130   b , whereby the period of light emission  1  based on the left-eye image data is initiated. 
         [0060]    During the period of light emission  1 , the pixel circuit  120   b  of the pixel  130   a  starts to update the pixel voltage based on the right-eye image data of the current frame. At this point, the scan line  140   b  is scanned every other line, and half of the previous pixel is updated. 
         [0061]    In the second non-emission period during which the period of light emission  1  (the update of the pixel circuit  120   b  of the pixel  130   a ) is completed, the pixel circuit  130   a  of the pixel  130   b  is likewise scanned every other line and the remaining half of the previous pixel is updated. Afterwards, LOW voltage is applied to the light emission control lines  144   b  and  144   c , and the driving of the respective connected light emitting elements  121   a  and  121   b  are controlled by the maintained voltage of the pixel circuit  120   a  of the pixel  130   a  and of the pixel circuit  120   a  of the pixel  130   b , whereby the period of light emission  2  based on the right-eye image data is initiated. 
         [0062]    Hereinafter, the displaying of the left-eye and right-eye images is realized by sequentially repeating this control. As shown in  FIG. 3 , the display data update period may be substantially twice that of the conventional art. 
         [0063]      FIG. 5  is a view showing a circuit block incorporating a panel, including pixels  130  (pixels  130   a  and  130   b ) in a matrix array, scan control circuits  131 , and data signal control circuits  132 , which is included in the electro-optic device  100  according to an exemplary embodiment. As shown in  FIG. 5 , a control circuit  133  may be installed behind the scan control circuit  131  to change the output destination every subframe when the output of the scan control circuit  131  is switched every 120 Hz. Thus, a signal output from the scan control circuit  131  and input into the scan line  140   a  and  140   b  may be switched between the scan line  140   a  and the scan line  140   b.    
         [0064]    In  FIG. 5 , the purpose of a target pixel switching signal line LR  145  for controlling the control circuit  133  that changes the output destination every subframe is illustrated. 
         [0065]    The electro-optic device  100  according to an exemplary embodiment performs scanning every other line. As a result, a shift register circuit within the scan control circuit  131  is reduced to half the size of that of the conventional art. The output destination is switched to the pixel  130   a  and the pixel  130   b  every ¼ frame, and the output destination is switched to the pixel circuit  120   a  and pixel circuit  120   b  of the pixel  130   a  every ½ frame. 
         [0066]      FIG. 6  is a view showing the timing chart of a control signal for a pixel circuit of the electro-optic device  100  of  FIG. 1  according to an exemplary embodiment. 
         [0067]    The timing chart shown in  FIG. 6  depicts DATA [m] applied to the data signal line  141 , SCAN [ 1 ] applied to the scan line  140   a  or scan line  140   b  of a first row, SCAN [ 2 ] applied to the scan line  140   c  of a second row, . . . , SCAN [n−1] applied to the scan line  140  or scan line  140   b  of an (n−1)th row, SCAN [n] applied to the scan line  140   c  of an n-th row, a target pixel switching signal line LR applied to the target pixel switching signal line  145  which makes either the scan line  140   a  or the scan line  140   b  effective, and control signals EM 1  [n], EM 2  [n], EM 3  [n] for turning the light emission switches  112   a ,  112   b , and  112   c  on. 
         [0068]    When the target pixel switching signal line LR is HIGH, the scan line  140   a  is selected, and when the target pixel switching signal line LR is LOW, the scan line  140   b  is selected. 
         [0069]    When the target pixel switching signal line LR is HIGH, if SCAN [1], [2], . . . , [n−1], [n] become low sequentially, the scan line  140   a  and the scan line  140   c  are selected every other line. When the target pixel switching signal line LR is LOW, if SCAN [1], [2], . . . , [n−1], [n] become low sequentially, the scan line  140   b  and the scan line  140   c  are selected every other line. By applying a signal as shown in  FIG. 6 , the electro-optic device  100  according to an exemplary embodiment is capable of the above-described operation. 
         [0070]      FIG. 7  is a view showing a required maintenance time of display data in the electro-optic device  100  according to an exemplary embodiment.  FIG. 7(   a ) depicts a required maintenance time of display data updated in a scan period  201  of  FIG. 3 ,  FIG. 7(   b ) depicts a required maintenance time of display data updated in a scan period  202  of  FIG. 3 , and  FIG. 7(   c ) depicts a required maintenance time of display data updated in a scan period  201  of  FIG. 3 . 
         [0071]    For better understanding of  FIG. 7 , periods during which the respective pixel circuits need to maintain the pixel voltage for display are indicated by oblique lines denoted by reference numerals  301 ,  302 , and  303 . As shown in  FIG. 7 , in the electro-optic device  100  according to an exemplary embodiment, the sustaining voltage that can be used for display every emission period alternates between the pixel circuit  120   a  and pixel circuit  120   b  of the pixel  130   a.    
         [0072]    As explained above, by linearly sequentially scanning half of the previous pixel in advance in an emission period to maintain the pixel voltage of the pixel circuits and linearly sequentially scanning the other pixels in a non-emission period to maintain the pixel voltage of the pixel circuits, the electro-optic device  100  according to an exemplary embodiment can secure a sufficient period for charging each pixel even if the screen has higher resolution and larger size. Further, the electro-optic device  100  according to an exemplary embodiment can ensure a higher aperture ratio and a sufficient brightness for image display, as compared to when two pixel circuits are provided for each pixel. That is, the electro-optic device  100  secures a sufficient period for charging each pixel and suppresses a decrease in aperture ratio even if the screen has higher resolution and larger size. 
         [0073]      FIG. 8  is a view showing another example of the panel driving timing of the electro-optic device  100  according to an exemplary embodiment. If a non-emission period and an emission period are of nearly the same length, a maximum data update period can be secured. For example, even if the non-emission period is longer than the emission period, as shown in  FIG. 8 , data written in the pixel  130   a  and the pixel  130   b  is allocated to half of the sum of both periods, thereby efficiently extending the data write time. 
         [0074]      FIG. 9  is a view showing yet another example of the panel driving timing of the electro-optic device  100  according to an exemplary embodiment. If the non-emission period is shorter than the emission period, as shown in  FIG. 9 , a maximum data write period can be secured by securing a maximum data update period of the pixel  130   a  and the pixel  130   b  with respect to the length of the non-emission period. 
         [0075]    Although exemplary embodiments have been described with reference to the attached drawings, they are not limited to these embodiments. It is clear that those skilled in the art could conceive of various altered or modified examples within the scope of the technical idea set forth in the claims, and it is to be understood that such examples also naturally belong to the technical scope of the invention. For example, the foregoing embodiments have been described with respect to an AMOLED, however, the example embodiments are not limited thereto. In another example, the driving timing may be applied to a pixel circuit incorporating a characteristic disparity compensation circuit of a driving TFT applied when LTPS is used as a backplane of the panel. 
       DESCRIPTION OF SYMBOLS 
       [0076]      
         [0000]    
       
         
               
               
             
           
               
                   
               
             
             
               
                 100 electro-optic device 
                 110a, 110b, 110c driving TFT 
               
               
                 111a, 11lb, 111c pixel switch 
                 112a, 112b, 112c light emission switch 
               
               
                 120a, 120b pixel circuit 
                 121a, 12lb, 121c light emitting element 
               
               
                 122a, 122b, 122c capacitor 
                 130a, 130b pixel 
               
               
                 131 scan control circuit 
                 132 data signal control circuit 
               
               
                 133 control circuit 
                 140a, 140b, 140c scan line 
               
               
                 141 data signal line 
                 142 anode power line 
               
               
                 143 cathode power line 
                 144 light emission control signal line 
               
               
                 145 target pixel switching signal line 
               
               
                   
               
             
          
         
       
     
         [0077]    While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.