Abstract:
A pixel structure adapted to a vertical alignment (VA) mode liquid crystal display (LCD) device is provided. The pixel structure includes a plurality of comb-shaped electrodes and a plurality of pixel transistors. The comb-shaped electrodes are interdigitated in a pairwise manner and thereby constitute at least one comb-shaped electrode pair. The pixel transistors respectively are electrically coupled to the comb-shaped electrodes. The comb-shaped electrodes respectively are electrically coupled to receive a plurality of data voltages through the respective pixel transistors and whereby at least a part of the data voltages are different, and the data voltages received by the two comb-shaped electrodes of each comb-shaped electrode pair are different from each other. Moreover, a VA mode LCD device using the pixel structure and a pixel driving method adapted thereto are also provided.

Description:
BACKGROUND 
     1. Technical Field 
     The description generally relates to liquid crystal display fields and, particularly to a pixel structure, a vertical alignment mode liquid crystal display device and a pixel driving method of liquid crystal display device. 
     2. Description of the Related Art 
     Nowadays, liquid crystal display devices have many advantages of high display quality, small volume, light weight and wide application range and thus are widely used in consumer electronics products such as mobile phones, laptop computers, desktop computers and televisions, etc. Moreover, the liquid crystal display devices have evolved into a mainstream display in place of cathode ray tube (CRT) displays. 
     In recent years, liquid crystal display screens of laptop computers with privacy function could potentially meet the demands for business people. Although the prevailing 3M privacy filter in the market can achieve a good privacy effect, the display brightness is decreased and it is inconvenient in use resulting from the privacy filter is necessarily removed before sharing the screen to multiple persons. In addition, an adjustable privacy screen such as a view angle controllable screen introduced by some company can be freely switched between a wide view mode and a narrow view mode. However, since such view angle controllable screen is designed with an additional view angle adjustable sub-pixel in each pixel, the additional sub-pixel is useless (i.e., not turned on) when the screen operates in the wide view mode, so that the brightness of the liquid crystal display panel is decreased. 
     SUMMARY 
     A pixel structure in accordance with an embodiment of the present invention is adapted to a vertical alignment (VA) mode liquid crystal display (LCD) device. In the present embodiment, the pixel structure includes a plurality of comb-shaped electrodes and a plurality of pixel transistors. The comb-shaped electrodes are interdigitated in a pairwise manner to form at least one comb-shaped electrode pair. The pixel transistors are respectively electrically coupled to the comb-shaped electrodes. The comb-shaped electrodes are electrically coupled to receive a plurality of data voltages through the respective pixel transistors. At least a part of the data voltages are different, and the data voltages received by the two comb-shaped electrodes in each comb-shaped electrode pair are different from each other. 
     In one embodiment, the two comb-shaped electrodes in each comb-shaped electrode pair receive the different data voltages from a same data line of the VA mode LCD device through two corresponding ones of the pixel transistors. In another embodiment, the two comb-shaped electrodes in each comb-shaped electrode pair receive the different data voltages respectively from two data lines of the VA mode LCD device through two corresponding ones of the pixel transistors. 
     In one embodiment, the two pixel transistors electrically coupled to a same comb-shaped electrode pair are sequentially enabled respectively by gate driving signals provided from two gate lines of the VA mode LCD device. In another embodiment, the two pixel transistors electrically coupled to a same comb-shaped electrode pair are enabled by a gate driving signal provided from a same gate line of the VA mode LCD device. 
     In one embodiment, the amount of the comb-shaped electrodes is four, the four comb-shaped electrodes are interdigitated in a pairwise manner to form two comb-shaped electrode pairs. The data voltages received by the four comb-shaped electrodes are partially identical. 
     A vertical alignment mode liquid crystal display device in accordance with an embodiment of the present invention includes a first data line, two gate lines and a pixel structure. The two gate lines are arranged crossing with the first data line. The pixel structure includes a plurality of pixel transistors and a plurality of comb-shaped electrodes. The comb-shaped electrodes are interdigitated in a pairwise manner and electrically coupled to the two gate lines through the respective pixel transistors. At least a part of the comb-shaped electrodes each is electrically coupled to the first data line through a corresponding one of the pixel transistors. 
     In one embodiment, the vertical alignment mode liquid crystal display device further includes a second data line. At least a part of the comb-shaped electrode(s) uncoupled to the first data line each is electrically coupled to the second data line through a corresponding one of the pixel transistor. Moreover, the amount of the comb-shaped electrodes can be four, the four comb-shaped electrodes are interdigitated in a pairwise manner to form two comb-shaped electrode pairs, and the two comb-shaped electrode pairs are arranged between the first data line and the second data line. In another embodiment, the first data line and the second data line are arranged between the two comb-shaped electrode pairs. In still another embodiment, the first and second data lines are alternately arranged with the two comb-shaped electrode pairs along a lengthwise direction of the two gate lines. 
     In one embodiment, the comb-shaped electrodes are interdigitated in a pairwise manner to form at least one comb-shaped electrode pair, the two comb-shaped electrodes in each comb-shaped electrode pair are respectively electrically coupled to the two gate line through two corresponding ones of the pixel transistors. In another embodiment, the two comb-shaped electrodes in each comb-shaped electrode pair are electrically coupled to a same one of the two gate line through two corresponding ones of the pixel transistors. 
     A pixel driving method of liquid crystal display device in accordance with an embodiment of the present invention is adapted to a vertical alignment mode liquid crystal display device. Herein, the vertical alignment mode liquid crystal display device includes a pixel structure and two gate lines. The pixel structure includes a plurality of comb-shaped electrodes and a plurality of liquid crystal molecules. The comb-shaped electrodes are electrically coupled to the two gate lines and interdigitated in a pairwise manner to form a plurality of comb-shaped electrode pairs. The two comb-shaped electrodes in each comb-shaped electrode pair are electrically coupled to the two gate lines respectively or electrically coupled to a same one of the two gate lines. In the present embodiment, the pixel driving method includes steps of: sequentially enabling the two gate lines; and providing a plurality of data voltages respectively to the comb-shaped electrodes to modulate an orientation of each of the liquid crystal molecules in the pixel structure, the data voltages being not completely identical. Moreover, the two data voltages received by the two comb-shaped electrodes in each comb-shaped electrode pair are different from each other. 
     In one embodiment, the pixel driving method further includes a step of: enabling the liquid crystal molecules in the pixel structure to align along a same orientation by the comb-shaped electrodes receiving the data voltages. 
     In one embodiment, the pixel driving method further includes a step of: enabling the liquid crystal molecules in the pixel structure to align along multiple different orientations by the comb-shaped electrodes receiving the data voltages. 
     In the various embodiments of the present invention, owing to the structural design of pixel electrode, cooperative with the liquid crystal molecule orientation control in the pixel structure by providing different data voltages (i.e., generally driving voltages), the pixel structure can achieve the purpose of view angle being adjustable e.g., switchable between a wide view mode and a narrow view mode and further the brightness of the display panel endowed with privacy function would not be decreased in the wide view mode. 
     Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which: 
         FIG. 1  is a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a first embodiment of the present invention. 
         FIG. 2  is a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a second embodiment of the present invention. 
         FIG. 3  is a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a third embodiment of the present invention. 
         FIG. 4  is a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a fourth embodiment of the present invention. 
         FIG. 5  is a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a fifth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     It is to be understood that other embodiment may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted,” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Accordingly, the descriptions will be regarded as illustrative in nature and not as restrictive. 
       FIG. 1  is a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a first embodiment. In  FIG. 1 , only one pixel structure of the vertical alignment mode liquid crystal display device  10  is shown for the purpose of illustration, but not to limit the amount of pixel structures of the vertical alignment mode liquid crystal display device in accordance with the present invention. As illustrated in  FIG. 1 , the pixel structure  12  includes comb-shaped electrodes E 1 , E 2 , E 3 , E 4  and pixel transistors T 1 , T 2 , T 3 , T 4 . Herein, the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  cooperatively form a pixel electrode of the pixel structure  12 . Of course, the pixel structure  12  generally further includes a common electrode (not shown in  FIG. 1 ) disposed opposite to the pixel electrode and liquid crystal molecules such as  121   a ,  121   b  arranged between the pixel electrode and the common electrodes. In this embodiment, the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  are interdigitated in a pairwise manner. Electrode fingers of the comb-shaped electrode E 1  extend to the right side, electrode fingers of the comb-shaped electrode E 2  extend to the left side, and thereby the comb-shaped electrodes E 1  and E 2  form a comb-shaped electrode pair. Likewise, electrode fingers of the comb-shaped electrode E 3  extend to the right side, electrode fingers of the comb-shaped electrode E 4  extend to the left side, and thereby the comb-shaped electrodes E 3  and E 4  form another comb-shaped electrode pair. The liquid crystal molecule  121   a  is arranged between the common electrode and the comb-shaped electrode pair E 1 , E 2 , and the liquid crystal molecule  121   b  is arranged between the common electrode and the comb-shaped electrode pair E 3 , E 4 . It is noted that,  FIG. 1  shows one liquid crystal molecule is arranged the common electrode and each comb-shaped electrode pair for the purpose of illustration, and thus is not to limit the amount of liquid crystal molecule in the pixel structure  12  in accordance with the present invention. 
     The comb-shaped electrode E 1  is electrically coupled to a data line DL(m−1) and a gate line GL(n−1) of the vertical alignment mode liquid crystal display device  10  through the pixel transistor T 1 , the comb-shaped electrode E 2  is electrically coupled to the data line DL(m−1) and another gate line GL(n) of the vertical alignment mode liquid crystal display device  10  through the pixel transistor T 2 , the comb-shaped electrode E 3  is electrically coupled to another data line DL(m) and the gate line GL(n−1) of the vertical alignment mode liquid crystal display device  10  through the pixel transistor T 3 , and the comb-shaped electrode E 4  is electrically coupled to the data line DL(m) and the gate line GL(n) through the pixel transistor T 4 , where m and n both are integers. In short, the two comb-shaped electrodes such as E 1  and E 3  (or E 3  and E 4 ) in a same comb-shaped electrode pair are electrically coupled to a same data line such as DL(m−1) (or DL(m)) and respectively electrically coupled to the two gate lines GL(n−1) and GL(n). 
     During the pixel structure  12  displays a gray level, the gate lines GL(n−1) and GL(n) will sequentially provide gate driving pulses G(n−1) and G(n) to enable the pixel transistors T 1 , T 2 , T 3  and T 4 , so that the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  are allowed to receive data voltages from the data lines DL(m−1) and DL(m).  FIG. 1  shows four different situations (1)˜(4) of the data voltages received by the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  during sequentially providing the gate driving pulses G(n−1) and G(n). 
     (1) when the data voltage on the data line DL(m−1) is switched from a low voltage L to a high voltage H and the data voltage on the data line DL(m) is switched from the high voltage H to the low voltage L, i.e., the data voltage received by the comb-shaped electrode E 1  is the low voltage L, the data voltage received by the comb-shaped electrode E 2  is the high voltage H, the data voltage received by the comb-shaped voltage E 3  is the high voltage H, and the data voltage received by the comb-shaped electrode E 4  is the low voltage L, the liquid crystal molecule  121   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the right side, the liquid crystal molecule  121   b  controlled by the comb-shaped electrode pair E 3 , E 4  tends to tilt to the left side, and therefore the pixel structure  12  operates at a wide view mode. 
     (2) when the data voltage on the data line DL(m−1) is switched from the high voltage H to the low voltage L, and the data voltage on the data line DL(m) is switched from the low voltage L to the high voltage H, i.e., the data voltage received by the comb-shaped electrode E 1  is the high voltage H, the data voltage received by the comb-shaped electrode E 2  is the low voltage L, the data voltage received by the comb-shaped electrode E 3  is the low voltage L, and the data voltage received by the comb-shaped electrode E 4  is the high voltage H, the liquid crystal molecule  121   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the left side, the liquid crystal molecule  121   b  controlled by the comb-shaped electrode pair E 3 , E 4  tends to tilt to the right side, and therefore the pixel structure  12  operates at another wide view mode. 
     (3) when the data voltage on the data line DL(m−1) is switched from the high voltage H to the low voltage L, and the data voltage on the data line DL(m) also is switched from the high voltage H to the low voltage L, the liquid crystal molecule  121   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the left side, the liquid crystal molecule  121   b  controlled by the comb-shaped electrode pair E 3 , E 4  also tends to tilt to the left side, and therefore the pixel structure  12  operates at a narrow view mode (i.e., an anti-peek mode) and only is suitable for the user to observe from the right side. 
     (4) when the data voltage on the data line DL(m−1) is switched from the low voltage L to the high voltage H, and the data voltage on the data line DL(m) also is switched from the low voltage L to the high voltage H, the liquid crystal molecule  121   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the right side, the liquid crystal molecule  121   b  controlled by the comb-shaped electrode pair E 3 , E 4  also tends to tile to the right side, and therefore the pixel structure  12  operates at another narrow view mode (i.e., another anti-peek mode) and only is suitable for the user to observe from the left side. 
     Referring to  FIG. 2 , a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a second embodiment of the present invention is shown. In  FIG. 2 , only one pixel structure of the vertical alignment mode liquid crystal display device  20  is shown for the purpose of illustration, but not to limit the amount of pixel structures of the vertical alignment mode liquid crystal display device in accordance with the present invention. As illustrated in  FIG. 2 , the pixel structure  22  includes comb-shaped electrodes E 1 , E 2 , E 3 , E 4  and pixel transistors T 1 , T 2 , T 3 , T 4 . Herein, the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  cooperatively form a pixel electrode of the pixel structure  22 . Of course, the pixel structure  22  generally further includes a common electrode (not shown in  FIG. 2 ) disposed opposite to the pixel electrode and liquid crystal molecules such as  221   a ,  221   b  arranged between the pixel electrode and the common electrodes. In this embodiment, the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  are interdigitated in a pairwise manner, and thereby the comb-shaped electrodes E 1  and E 2  form a comb-shaped electrode pair, and likewise the comb-shaped electrodes E 3  and E 4  form another comb-shaped electrode pair. The liquid crystal molecule  221   a  is arranged between the common electrode and the comb-shaped electrode pair E 1 , E 2 , and the liquid crystal molecule  221   b  is arranged between the common electrode and the comb-shaped electrode pair E 3 , E 4 . 
     The comb-shaped electrode E 1  is electrically coupled to a data line DL(m−1) and a gate line GL(n−1) of the vertical alignment mode liquid crystal display device  20  through the pixel transistor T 1 , the comb-shaped electrode E 2  is electrically coupled to the data line DL(m−1) and another gate line GL(n) of the vertical alignment mode liquid crystal display device  20  through the pixel transistor T 2 , the comb-shaped electrode E 3  is electrically coupled to another data line DL(m) and the gate line GL(n) of the vertical alignment mode liquid crystal display device  20  through the pixel transistor T 4 , and the comb-shaped electrode E 4  is electrically coupled to the data line DL(m) and the gate line GL(n−1) through the pixel transistor T 3 , where m and n both are integers. In short, the two comb-shaped electrodes such as E 1  and E 2  (or E 3  and E 4 ) in a same comb-shaped electrode pair are electrically coupled to a same data line such as DL(m−1) (or DL(m)) and respectively electrically coupled to the two gate lines GL(n−1) and GL(n). 
     During the pixel structure  22  displays a gray level, the gate lines GL(n−1) and GL(n) will sequentially provide gate driving pulses G(n−1) and G(n) to enable the pixel transistors T 1 , T 2 , T 3  and T 4 , so that the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  are allowed to receive data voltages from the data lines DL(m−1) and DL(m).  FIG. 2  shows four different situations (i)˜(iv) of the data voltages received by the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  during sequentially providing the gate driving pulses G(n−1) and G(n). 
     (i) when the data voltage on the data line DL(m−1) is switched from a low voltage L to a high voltage H and the data voltage on the data line DL(m) also is switched from the low voltage L to the high voltage H, i.e., the data voltage received by the comb-shaped electrode E 1  is the low voltage L, the data voltage received by the comb-shaped electrode E 2  is the high voltage H, the data voltage received by the comb-shaped voltage E 3  is the high voltage H, and the data voltage received by the comb-shaped electrode E 4  is the low voltage L, the liquid crystal molecule  221   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the right side, the liquid crystal molecule  221   b  controlled by the comb-shaped electrode pair E 3 , E 4  tends to tilt to the left side, and therefore the pixel structure  22  operates at a wide view mode. 
     (ii) when the data voltage on the data line DL(m−1) is switched from the high voltage H to the low voltage L, and the data voltage on the data line DL(m) also is switched from the high voltage H to the low voltage L, i.e., the data voltage received by the comb-shaped electrode E 1  is the high voltage H, the data voltage received by the comb-shaped electrode E 2  is the low voltage L, the data voltage received by the comb-shaped electrode E 3  is the low voltage L, and the data voltage received by the comb-shaped electrode E 4  is the high voltage H, the liquid crystal molecule  221   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the left side, the liquid crystal molecule  221   b  controlled by the comb-shaped electrode pair E 3 , E 4  tends to tilt to the right side, and therefore the pixel structure  22  operates at another wide view mode. 
     (iii) when the data voltage on the data line DL(m−1) is switched from the high voltage H to the low voltage L, and the data voltage on the data line DL(m) is switched from the low voltage L to the high voltage H, the liquid crystal molecule  221   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the left side, the liquid crystal molecule  221   b  controlled by the comb-shaped electrode pair E 3 , E 4  also tends to tilt to the left side, and therefore the pixel structure  22  operates at a narrow view mode (i.e., an anti-peek mode) and only is suitable for the user to observe from the right side. 
     (iv) when the data voltage on the data line DL(m−1) is switched from the low voltage L to the high voltage H, and the data voltage on the data line DL(m) is switched from the high voltage H to the low voltage L, the liquid crystal molecule  221   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the right side, the liquid crystal molecule  221   b  controlled by the comb-shaped electrode pair E 3 , E 4  also tends to tile to the right side, and therefore the pixel structure  22  operates at another narrow view mode (i.e., another anti-peek mode) and only is suitable for the user to observe from the left side. 
     Referring to  FIG. 3 , a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a third embodiment of the present invention is shown. In  FIG. 3 , only one pixel structure of the vertical alignment mode liquid crystal display device  30  is shown for the purpose of illustration, but not to limit the amount of pixel structures of the vertical alignment mode liquid crystal display device in accordance with the embodiment. As illustrated in  FIG. 3 , the pixel structure  32  includes comb-shaped electrodes E 1 , E 2 , E 3 , E 4  and pixel transistors T 1 , T 2 , T 3 , T 4 . Herein, the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  cooperatively form a pixel electrode of the pixel structure  32 . Of course, the pixel structure  32  generally further includes a common electrode (not shown in  FIG. 3 ) disposed opposite to the pixel electrode and liquid crystal molecules such as  321   a ,  321   b  arranged between the pixel electrode and the common electrodes. In this embodiment, the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  are interdigitated in a pairwise manner, and thereby the comb-shaped electrodes E 1  and E 2  form a comb-shaped electrode pair, and likewise the comb-shaped electrodes E 3  and E 4  form another comb-shaped electrode pair. The liquid crystal molecule  321   a  is arranged between the common electrode and the comb-shaped electrode pair E 1 , E 2 , and the liquid crystal molecule  321   b  is arranged between the common electrode and the comb-shaped electrode pair E 3 , E 4 . 
     The comb-shaped electrode E 1  is electrically coupled to a data line DL(m−1) and a gate line GL(n−1) of the vertical alignment mode liquid crystal display device  30  through the pixel transistor T 1 , the comb-shaped electrode E 2  is electrically coupled to another data line DL(m) and the gate line GL(n−1) of the vertical alignment mode liquid crystal display device  30  through the pixel transistor T 3 , the comb-shaped electrode E 3  is electrically coupled to the data line DL(m−1) and another gate line GL(n) of the vertical alignment mode liquid crystal display device  30  through the pixel transistor T 2 , and the comb-shaped electrode E 4  is electrically coupled to the data line DL(m) and the gate line GL(n) through the pixel transistor T 4 , where m and n both are integers. In short, the two comb-shaped electrodes such as E 1  and E 2  (or E 3  and E 4 ) in a same comb-shaped electrode pair are electrically coupled to a same data line such as DL(m−1) (or DL(m)) and respectively electrically coupled to the two gate lines GL(n−1) and GL(n). 
     During the pixel structure  32  displays a gray level, the gate lines GL(n−1) and GL(n) will sequentially provide gate driving pulses G(n−1) and G(n) to enable the pixel transistors T 1 , T 2 , T 3  and T 4 , so that the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  are allowed to receive data voltages from the data lines DL(m−1) and DL(m).  FIG. 3  shows four different situations (I)˜(IV) of the data voltages received by the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  during sequentially providing the gate driving pulses G(n−1) and G(n). 
     (I) when the data voltage on the data line DL(m−1) is switched from a low voltage L to a high voltage H and the data voltage on the data line DL(m) is switched from the high voltage H to the low voltage L, i.e., the data voltage received by the comb-shaped electrode E 1  is the low voltage L, the data voltage received by the comb-shaped electrode E 2  is the high voltage H, the data voltage received by the comb-shaped voltage E 3  is the high voltage H, and the data voltage received by the comb-shaped electrode E 4  is the low voltage L, the liquid crystal molecule  321   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the right side, the liquid crystal molecule  321   b  controlled by the comb-shaped electrode pair E 3 , E 4  tends to tilt to the left side, and therefore the pixel structure  32  operates at a wide view mode. 
     (II) when the data voltage on the data line DL(m−1) is switched from the high voltage H to the low voltage L, and the data voltage on the data line DL(m) is switched from the low voltage L to the high voltage H, i.e., the data voltage received by the comb-shaped electrode E 1  is the high voltage H, the data voltage received by the comb-shaped electrode E 2  is the low voltage L, the data voltage received by the comb-shaped electrode E 3  is the low voltage L, and the data voltage received by the comb-shaped electrode E 4  is the high voltage H, the liquid crystal molecule  321   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the left side, the liquid crystal molecule  321   b  controlled by the comb-shaped electrode pair E 3 , E 4  tends to tilt to the right side, and therefore the pixel structure  32  operates at another wide view mode. 
     (III) when the data voltage on the data line DL(m−1) is kept at the high voltage H, and the data voltage on the data line DL(m) is kept at the low voltage L, the liquid crystal molecule  321   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the left side, the liquid crystal molecule  321   b  controlled by the comb-shaped electrode pair E 3 , E 4  also tends to tilt to the left side, and therefore the pixel structure  32  operates at a narrow view mode (i.e., an anti-peek mode) and only is suitable for the user to observe from the right side. 
     (IV) when the data voltage on the data line DL(m−1) is kept at the low voltage L, and the data voltage on the data line DL(m) is kept at the high voltage H, the liquid crystal molecule  321   a  controlled by the comb-shaped electrode pair E 1 , E 2  tends to tilt to the right side, the liquid crystal molecule  321   b  controlled by the comb-shaped electrode pair E 3 , E 4  also tends to tile to the right side, and therefore the pixel structure  32  operates at another narrow view mode (i.e., another anti-peek mode) and only is suitable for the user to observe from the left side. 
     In short, in the above first through third embodiments of the present invention, by suitably changing electrical connection relationships between the comb-shaped electrodes E 1 ˜E 4  in the pixel electrode and the pixel transistors T 1 ˜T 4 , the data lines DL(m−1), DL(m), the gate lines GL(n−1), GL(n) and using suitable data voltage provision manners, makes the data voltages received by the respective comb-shaped electrodes E 1 ˜E 4  be not completely identical and the data voltages received by the two comb-shaped electrodes in a same comb-shaped electrode pair be different from each other, so that the orientation of each liquid crystal molecule in each of the pixel structures  12 ,  22 ,  32  can be flexibly adjusted, for example, enabling the liquid crystal molecules to align a same orientation or multiple different orientations so that each of the pixel structures  12 ,  22 ,  32  can operate at the wide view mode or anti-peek mode, and further the panel brightness in the wide view mode would not be not decreased. 
     In addition, the comb-shaped electrodes E˜E 4  in each pixel structure in accordance with the first through third embodiments are arranged between two adjacent data lines DL(m−1) and DL(m), but it is not to limit the present invention, and the relative positional relationships between the comb-shaped electrodes E 1 ˜E 4  and the data lines can be like that as illustrated in  FIGS. 4 and 5 . 
     Referring to  FIG. 4 , a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a fourth embodiment is shown. In  FIG. 4 , only one pixel structure of the vertical alignment mode liquid crystal display device  40  is shown for the purpose of illustration, but not to limit the amount of pixel structures of the vertical alignment mode liquid crystal display device in accordance with the present invention. As illustrated in  FIG. 4 , the pixel structure  42  includes comb-shaped electrodes E 1 , E 2 , E 3 , E 4  and pixel transistors T 1 , T 2 , T 3 , T 4 . Herein, the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  cooperatively form a pixel electrode of the pixel structure  42 . Of course, the pixel structure  42  generally further includes a common electrode (not shown in  FIG. 4 ) disposed opposite to the pixel electrode and liquid crystal molecules (not shown in  FIG. 4 ) arranged between the pixel electrode and the common electrodes. In this embodiment, the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  are interdigitated in a pairwise manner, and thereby the comb-shaped electrodes E 1  and E 2  form a comb-shaped electrode pair, and likewise the comb-shaped electrodes E 3  and E 4  form another comb-shaped electrode pair. 
     The comb-shaped electrode E 1  is electrically coupled to a data line DL(m−1) and a gate line GL(n−1) of the vertical alignment mode liquid crystal display device  40  through the pixel transistor T 1 , the comb-shaped electrode E 2  is electrically coupled to the data line DL(m−1) and another gate line GL(n) of the vertical alignment mode liquid crystal display device  40  through the pixel transistor T 2 , the comb-shaped electrode E 3  is electrically coupled to another data line DL(m) and the gate line GL(n−1) of the vertical alignment mode liquid crystal display device  40  through the pixel transistor T 3 , and the comb-shaped electrode E 4  is electrically coupled to the data line DL(m) and the gate line GL(n) through the pixel transistor T 4 , where m and n both are integers. In short, the two comb-shaped electrodes such as E 1  and E 2  (or E 3  and E 4 ) in a same comb-shaped electrode pair are electrically coupled to a same data line such as DL(m−1) (or DL(m)) and respectively electrically coupled to the two gate lines GL(n−1) and GL(n). 
     Furthermore, in the fourth embodiment, the data lines DL(m−1), DL(m) are arranged between the comb-shaped electrode pair E 1 , E 2  and the comb-shaped electrode pair E 3 , E 4 . 
     Referring to  FIG. 5 , a partial schematic structural view of a vertical alignment mode liquid crystal display device in accordance with a fifth embodiment is shown. In  FIG. 5 , only one pixel structure of the vertical alignment mode liquid crystal display device  50  is shown for the purpose of illustration, but not to limit the amount of pixel structures of the vertical alignment mode liquid crystal display device in accordance with the present invention. As illustrated in  FIG. 5 , the pixel structure  52  includes comb-shaped electrodes E 1 , E 2 , E 3 , E 4  and pixel transistors T 1 , T 2 , T 3 , T 4 . Herein, the comb-shaped electrodes E 1 , E 2 , E 3 , E 4  cooperatively form a pixel electrode of the pixel structure  52 . Of course, the pixel structure  52  generally further includes a common electrode (not shown in  FIG. 5 ) disposed opposite to the pixel electrode and liquid crystal molecules (not shown in  FIG. 5 ) arranged between the pixel electrode and the common electrodes. In this embodiment, the comb-shaped electrodes E 1 , E 2 , E 3  and E 4  are interdigitated in a pairwise manner, and thereby the comb-shaped electrodes E 1  and E 2  form a comb-shaped electrode pair, and likewise the comb-shaped electrodes E 3  and E 4  form another comb-shaped electrode pair. 
     The comb-shaped electrode E 1  is electrically coupled to a data line DL(m−1) and a gate line GL(n−1) of the vertical alignment mode liquid crystal display device  50  through the pixel transistor T 1 , the comb-shaped electrode E 2  is electrically coupled to another data line DL(m) and another gate line GL(n) of the vertical alignment mode liquid crystal display device  50  through the pixel transistor T 2 , the comb-shaped electrode E 3  is electrically coupled to the data line DL(m) and the gate line GL(n−1) of the vertical alignment mode liquid crystal display device  50  through the pixel transistor T 3 , and the comb-shaped electrode E 4  is electrically coupled to another data line DL(m+1) and the gate line GL(n) through the pixel transistor T 4 , where m and n both are integers. In short, the two comb-shaped electrodes such as E 1  and E 2  (or E 3  and E 4 ) in a same comb-shaped electrode pair are respectively electrically coupled to the data lines such as DL(m−1) and DL(m) (or DL(m) and DL(m+1)) and further respectively electrically coupled to the two gate lines GL(n−1) and GL(n). 
     Furthermore, in the fifth embodiment, the data lines DL(m−1), DL(m), DL(m+1) are alternately arranged with the comb-shaped electrode pairs E 1 , E 2  and E 3 , E 4  along a lengthwise direction (e.g., the horizontal direction in  FIG. 5 ) of the gate lines GL(n−1), GL(n). In other words, each comb-shaped electrode pair is arranged between two adjacent data lines. 
     In summary, in the various embodiments, owing to the structural design of pixel electrode, cooperative with the liquid crystal molecule orientation control in the pixel structure by providing different data voltages (i.e., generally driving voltages), the pixel structure can achieve the purpose of view angle being adjustable e.g., switchable between a wide view mode and a narrow view mode and further the brightness of the display panel endowed with privacy function would not be decreased in the wide view mode. 
     Additionally, it is found from the first through fifth embodiments that a single pixel structure can be considered as including only one comb-shaped electrode pair instead, by modulating the data voltages provided to the two comb-shaped electrodes in the comb-shaped electrode pair, the liquid crystal molecule(s) can be enabled to tilt to the left side or the right side for switching different narrow view modes, which also can achieve the purpose of privacy. 
     The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including configurations ways of the recessed portions and materials and/or designs of the attaching structures. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.