Abstract:
A display device includes a plurality of sub-pixel groups. Each of sub-pixel groups includes a first sub-pixel located at a first column; a second sub-pixel located at a second column adjacent to the first column; a third sub-pixel located at a third column adjacent to the second column; a fourth sub-pixel located at a fourth column adjacent to the third column; and a fifth sub-pixel located at the third column and the fourth column; wherein height of first sub-pixel equals height of second sub-pixel, height of first sub-pixel is greater than heights of third sub-pixel, fourth sub-pixel and fifth sub-pixel, and height of the first sub-pixel is different from or equal to sum of heights of fifth sub-pixel and third sub-pixel or sum of heights of fifth sub-pixel and fourth sub-pixel; wherein height of fifth sub-pixel is different from or equal to heights of third sub-pixel and fourth sub-pixel.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a display device and driving module thereof, and more particularly, to a display device reducing power consumption and increasing brightness via changing pixel arrangement method and driving module thereof. 
         [0003]    2. Description of the Prior Art 
         [0004]    A liquid crystal display (LCD) is a flat panel display which has the advantages of low radiation, light weight and low power consumption and is widely used in various information technology (IT) products, such as notebook computers, personal digital assistants (PDA), and mobile phones. An active matrix thin film transistor (TFT) LCD is the most commonly used transistor type in LCD families, and particularly in the large-size LCD family. A driving system installed in the LCD includes a timing controller, source drivers and gate drivers. The source and gate drivers respectively control data lines and scan lines, which intersect to form a cell matrix. Each intersection is a cell including crystal display molecules and a TFT. In the driving system, the gate drivers are responsible for transmitting scan signals to gates of the TFTs to turn on the TFTs on the panel. The source drivers are responsible for converting digital image data, sent by the timing controller, into analog voltage signals and outputting the voltage signals to sources of the TFTs. When a TFT receives the voltage signals, a corresponding liquid crystal molecule has a terminal whose voltage changes to equalize the drain voltage of the TFT, which thereby changes its own twist angle. The rate that light penetrates the liquid crystal molecule is changed accordingly, allowing different colors to be displayed on the panel. 
         [0005]    An image quality of the LCD can be determined via counting a number of pixels of the LCD located in a direction. For example, the user may acquire a reference of determining the image quality of the LCD via calculating the pixels per inch (PPI). Please refer to  FIG. 1 , which is a schematic diagram of the relationship between the image quality and the PPI. As shown in  FIG. 1 , the image quality is proportional to the PPI. However, recognizing ability of the eyes has a limit. When the PPI of the LCD exceeds a threshold, the eyes generally cannot recognize each pixel of the LCD. In other words, the image viewed by the eyes would become no-grid if the PPI of the LCD exceeds the threshold. 
         [0006]    For example, under a condition that the visual acuity of the user is 1.0 and a distance between the eyes and the LCD is 12 inches, the user is difficult to recognize distances between the pixels of the LCD when the PPI of the LCD exceeds 286. In other words, the image received by the eyes becomes no-grid if the PPI of the LCD reaches 286. In such a condition, the number of sub-pixels corresponding to each pixel can be accordingly decreased, to increase the aperture ratio and to reduce the power consumption of the LCD. Thus, how to decrease the number of sub-pixel while maintaining the image quality becomes a topic to be discussed. 
       SUMMARY OF THE INVENTION 
       [0007]    In order to solve the above problem, the present invention provides a display device with innovative pixel arrangement methods and driving module thereof. 
         [0008]    As an aspect, the present invention discloses a display device. The display device comprises a plurality of sub-pixel groups. Each of sub-pixel groups comprises a first sub-pixel, a second sub-pixel, a third sub-pixel, a fourth sub-pixel, and a fifth sub-pixel. The first sub-pixel is located at a first column, the second sub-pixel is located at a second column adjacent to the first column, the third sub-pixel is located at a third column adjacent to the second column, the fourth sub-pixel is located at a fourth column adjacent to the third column, and the fifth sub-pixel is located at the third column and the fourth column. A height of the first sub-pixel equals a height of the second sub-pixel; the height of the first sub-pixel is greater than heights of the third sub-pixel, the fourth sub-pixel and the fifth sub-pixel; the height of the first sub-pixel is different from or equal to a sum of the heights of the fifth sub-pixel and the third sub-pixel or a sum of the heights of the fifth sub-pixel and the fourth sub-pixel; the height of the fifth sub-pixel is different from or equal to the heights of the third sub-pixel and the fourth sub-pixel. 
         [0009]    As to another aspect, the present invention discloses a driving module in a display device with a plurality of sub-pixel groups. The driving module is used for driving the display device to display images. Each of sub-pixel groups comprises a first sub-pixel, a second sub-pixel, a third sub-pixel, a fourth sub-pixel, and a fifth sub-pixel. The first sub-pixel is located at a first column, the second sub-pixel is located at a second column adjacent to the first column, the third sub-pixel is located at a third column adjacent to the second column, the fourth sub-pixel is located at a fourth column adjacent to the third column, and the fifth sub-pixel is located at the third column and the fourth column. A height of the first sub-pixel equals a height of the second sub-pixel; the height of the first sub-pixel is greater than heights of the third sub-pixel, the fourth sub-pixel and the fifth sub-pixel; the height of the first sub-pixel is different from or equal to a sum of the heights of the fifth sub-pixel and the third sub-pixel or a sum of the heights of the fifth sub-pixel and the fourth sub-pixel; the height of the fifth sub-pixel is different from or equal to the heights of the third sub-pixel and the fourth sub-pixel. 
         [0010]    As to another aspect, the present invention discloses a display device. The display device comprises a plurality of sub-pixel groups. Each of sub-pixel groups comprises a first sub-pixel, a second sub-pixel, a third sub-pixel, a fourth sub-pixel, a fifth sub-pixel, and a sixth sub-pixel. The first sub-pixel is located at a first column, the second sub-pixel is located at a second column adjacent to the first column, the third sub-pixel is located at a third column adjacent to the second column, the fourth sub-pixel is located at a fourth column adjacent to the third column, the fifth sub-pixel is located at the second column, and the sixth sub-pixel is located at the third column and the fourth column. A height of the first sub-pixel is greater than heights of the second sub-pixel, the third sub-pixel, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel; the height of the first sub-pixel is different from or equal to a sum of the heights of the fifth sub-pixel and the second sub-pixel; the height of the first sub-pixel is different from or equal to a sum of the heights of the sixth sub-pixel and the third sub-pixel or a sum of the heights of the sixth sub-pixel and the fourth sub-pixel; the height of the second sub-pixel is different from or equal to the height of the fifth sub-pixel and the height of the sixth sub-pixel is different from or equal to the heights of the third sub-pixel and the fourth sub-pixel. 
         [0011]    As to another aspect, the present invention discloses a driving module in a display device with a plurality of sub-pixel groups. The driving module is used for driving the display device to display images. Each of sub-pixel groups comprises a first sub-pixel, a second sub-pixel, a third sub-pixel, a fourth sub-pixel, a fifth sub-pixel, and a sixth sub-pixel. The first sub-pixel is located at a first column, the second sub-pixel is located at a second column adjacent to the first column, the third sub-pixel is located at a third column adjacent to the second column, the fourth sub-pixel is located at a fourth column adjacent to the third column, the fifth sub-pixel is located at the second column, and the sixth sub-pixel is located at the third column and the fourth column. A height of the first sub-pixel is greater than heights of the second sub-pixel, the third sub-pixel, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel; the height of the first sub-pixel is different from or equal to a sum of the heights of the fifth sub-pixel and the second sub-pixel; the height of the first sub-pixel is different from or equal to a sum of the heights of the sixth sub-pixel and the third sub-pixel or a sum of the heights of the sixth sub-pixel and the fourth sub-pixel; the height of the second sub-pixel is different from or equal to the height of the fifth sub-pixel and the height of the sixth sub-pixel is different from or equal to the heights of the third sub-pixel and the fourth sub-pixel. 
         [0012]    These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]      FIG. 1  is a schematic diagram of the relationship between the image quality and the pixel per inch. 
           [0014]      FIG. 2  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0015]      FIG. 3  is a schematic diagram of the sub-pixel group shown in  FIG. 2 . 
           [0016]      FIG. 4  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0017]      FIG. 5  is a schematic diagram of the sub-pixel group shown in  FIG. 4 . 
           [0018]      FIG. 6  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0019]      FIG. 7  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0020]      FIG. 8  is a schematic diagram of a sub-pixel group according to an embodiment of the present invention. 
           [0021]      FIG. 9  is a schematic diagram of circuit layout of the display device shown in  FIG. 6 . 
           [0022]      FIG. 10  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0023]      FIG. 11  is a schematic diagram of the sub-pixel group shown in  FIG. 10 . 
           [0024]      FIG. 12  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0025]      FIG. 13  is a schematic diagram of the sub-pixel group shown in  FIG. 12 . 
           [0026]      FIG. 14  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0027]      FIG. 15  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0028]      FIG. 16  is a schematic diagram of a sub-pixel group according to an embodiment of the present invention. 
           [0029]      FIG. 17  is a schematic diagram of circuit layout of the display device shown in  FIG. 14 . 
           [0030]      FIG. 18  is a schematic diagram of another circuit layout of the display device shown in  FIG. 14 . 
           [0031]      FIG. 19  is a schematic diagram of still another circuit layout of the display device shown in  FIG. 14 . 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    The present invention reduces a number of sub-pixels corresponding to each pixel via different arrangements of the sub-pixels. An aperture ratio and brightness of the liquid crystal display (LCD) are accordingly improved. The power consumption and the layout area of the LCD are further decreased. 
         [0033]    Please refer to  FIG. 2 , which is a schematic diagram of a display device  20  according to an embodiment of the present invention. The display device  20  may be an electronic product with a liquid crystal panel, such as a television, a smart phone or a tablet, and is not limited herein.  FIG. 2  only shows parts of sub-pixels of the display device  20  for illustrations. Note that,  FIG. 2  is utilized for illustrating the relative positions of the sub-pixels and not for limiting the ratio between length and width. As shown in  FIG. 2 , the display device  20  comprises a plurality of repeatedly arranged sub-pixel groups SPG 1  (only one sub-pixel group SPG 1  is marked in  FIG. 2  for illustrations). In order to simplify the descriptions, please refer to  FIG. 3  which is a schematic diagram of the sub-pixel group SPG 1  shown in  FIG. 2 . In  FIG. 3 , the sub-pixel group SPG 1  comprises sub-pixels SP 1 -SP 5 . The sub-pixel SP 1  is configured at the j column, the i row and the i+1 row; the sub-pixel SP 2  is configured at the j+1 column, the i row and the i+1 row; the sub-pixel SP 3  is configured at the j+2 column and the i+1 row; the sub-pixel SP 4  is configured at the j+3 column and the i+1 row; and the sub-pixel SP 5  is configured at the j+2, j+3 column and the i row. The heights of the sub-pixels SP 3  and SP 4  may be different from or equal to that of the sub-pixel SP 5 . Via the abovementioned arrangement method of the sub-pixels SP 1 -SP 5 , the sub-pixel group SPG 1  is corresponding to 2 pixels. That is, a number of the sub-pixels corresponding to a pixel is reduced, such that the aperture ratio of display device  20  is increased and the power consumption of the display device  20  is decreased. 
         [0034]    In detail, the sub-pixels SP 1  and SP 2  may have a same height L 1 , the sub-pixels SP 3  and SP 4  may have a same height L 2  and the sub-pixels SP 5  may have a height L 3 . The height L 1  is greater than the heights L 2  and L 3 , the height L 2  is greater than or equal to the height L 3 , and the height L 1  is different from or equal to a sum of the heights L 2  and L 3 . In other words, the rows of the sub-pixels SP 3 -SP 5  overlap those of the sub-pixels SP 1  and SP 2 . 
         [0035]    In this embodiment, the sub-pixels SP 1 -SP 5  are corresponding to blue, green, red, green and white, wherein the sub-pixels SP 2  and SP 4  corresponding to green have different areas. Via adding the sub-pixel SP 5  corresponding to white, the brightness of the display device  20  increases and the power consumption of the display device  20  decreases. According to different applications and design concepts, the colors corresponding to the sub-pixels SP 1 -SP 5  in the sub-pixel group SPG 1  may be changed and are not limited by those shown in  FIG. 3 . For example, the sub-pixel SP 5  maybe altered to be corresponding to other color different from red, blue and green (e.g. yellow). In another embodiment, the sub-pixels SP 1 -SP 5  are corresponding to more than 4 colors. That is, the sub-pixels SP 1 -SP 5  in the sub-pixel group SPG 1  are corresponding to at least 4 colors. 
         [0036]    As to the relationships between the pixels and the sub-pixels SP 1 -SP 5  in the sub-pixel group SPG 1  please refer to the followings. As shown in  FIG. 3 , the sub-pixels SP 1  and SP 2  are corresponding to a pixel and the sub-pixels SP 3 -SP 5  are corresponding to another pixel. If the problem of lacking colors occurs when the sub-pixels SP 1  and SP 2  or the sub-pixels SP 3 -SP 5  displays the corresponded pixel, the display device  20  may borrow the colors from surrounding sub-pixels via adopting an algorithm (e.g. the sub-pixel rendering algorithm), to display the corresponded pixel completely. In the prior art, each pixel requires 4 sub-pixels in average when utilizing the sub-pixels corresponding to white. In comparison, 5 sub-pixels are corresponding to 2 pixels in the sub-pixel group SPG 1 . That is, the average number of sub-pixels required by each pixel is decreased to 2.5. If the resolution of the display device  20  is constant, the number of the sub-pixels utilized for realizing the display device  20  is reduced and the aperture ratio of the display device  20  is accordingly increased. 
         [0037]    In an embodiment, a vertical displacement may exist between the sub-pixels of the display device  20  shown in  FIG. 2 . Please refer to  FIG. 4 , which is a schematic diagram of a display device  40  according to an embodiment of the present invention. The display device  40  may be an electronic product with a liquid crystal panel, such as a television, a smart phone or a tablet, and is not limited herein.  FIG. 4  only shows parts of sub-pixels of the display device  40  for illustrations. Note that,  FIG. 4  is utilized for illustrating the relative positions of the sub-pixels and not for limiting the ratio between length and width. As shown in  FIG. 4 , the display device  40  comprises a plurality of repeatedly arranged sub-pixel groups SPG 2  (only one sub-pixel group SPG 2  is marked in  FIG. 4  for illustrations). In order to simplify the descriptions, please refer to  FIG. 5  which is a schematic diagram of the sub-pixel group SPG 2  shown in  FIG. 4 . In  FIG. 5 , the sub-pixel group SPG 2  comprises sub-pixels SP 6 -SP 10 . Different from the sub-pixel group SPG 1  shown in  FIG. 3 , the sub-pixels SP 8 -SP 10  are shifted downwards a vertical displacement V 1 . Thus, the sub-pixel SP 8  is at the j+2 and j+3 columns and the i+1 row, the sub-pixel SP 9  is at the j+2 column and the i+2 row and the sub-pixel SP 10  is at the j+3 column and the i+2 row. Via the abovementioned arrangement method of the sub-pixels SP 6 -SP 10 , the sub-pixel group SPG 2  is corresponding to two pixels and the aperture ratio of the display device  40  is accordingly increased. The colors and the length-width relationships between the sub-pixels SP 6 -SP 10  of the sub-pixel group SPG 2  can be referred to the sub-pixels SP 1 -SP 5  of the sub-pixel group SPG 1 , and are not narrated herein for brevity. 
         [0038]    In the sub-pixel group SPG 2  shown in  FIG. 5 , the row of the sub-pixel SP 8  overlaps those of the sub-pixels SP 6  and SP 7  and rows of the sub-pixels SP 9  and SP 10  partially overlaps those of the sub-pixels SP 6  and SP 7 . According to different applications and design concepts, the arrangement relationships between the sub-pixels SP 6 -SP 10  may be appropriated altered. For example, the sub-pixels SP 8 -SP 10  may change to be shifted upwards, such that only the rows of the sub-pixels SP 9  and SP 10  overlaps those of the sub-pixels SP 6  and SP 7 . Similarly, the sub-pixel SP 7  may be shifted vertically. In other words, the row of at least one of the sub-pixels located at the same column overlaps that of the sub-pixel SP 6 . 
         [0039]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 1  located of the adjacent rows in the display device  20  shown in  FIG. 2 . Please refer to  FIG. 6 , which is a schematic diagram of a display device  60  according to an embodiment of the present invention. The display device  60  is similar to the display device  20  shown in  FIG. 2 , thus the components and the signals with the same functions use the same symbols. Different from the display device  20 , a horizontal displacement W 1  exists between the sub-pixel groups SPG 1  configured at the adjacent rows (e.g. the sub-pixel groups SPG 1  located at the i row and the i+1 row and those located at the i+2 row and the i+3 row). In this embodiment, the horizontal displacement W 1  is half of the width of the sub-pixel group SPG 1 . As a result, the display device  60  equips different sub-pixel arrangement method can be realized by the sub-pixel group SPG 1 . In addition, the sub-pixel group SPG 3  shown in  FIG. 6  also can be regarded as the repeating sub-pixel group in this embodiment. In other words, the display device  60  shown in  FIG. 6  can be acquired by repeatedly arranging the sub-pixel group SPG 3 . 
         [0040]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 1  located at adjacent rows and a vertical displacement may exist between sub-pixels SP 1 -SP 5  of each sub-pixel group SPG 1  in the display device  20  shown in  FIG. 2 . Please refer to  FIG. 7 , which is a schematic diagram of a display device  70  according to an embodiment of the present invention. The display device  70  is similar to the display device  60  shown in  FIG. 6 , thus the components and the signal with the similar functions use the same symbols. Different from the display device  60 , the sub-pixels of the j+2, j+3, j+6, j+7, j+10 and j+11 columns in the display device  70  are shifted downwards by a vertical displacement V 2 . In this embodiment, the sub-pixel group SPG 4  shown in  FIG. 7  also can be regarded as the repeating sub-pixel group. That is, the display device  70  shown in  FIG. 7  can be acquired by repeatedly arranging the sub-pixel group SPG 4 . 
         [0041]    In an embodiment, the arrangement method of the sub-pixels SP 1 -SP 5  in the sub-pixel group SPG 1  may be appropriately modified. Please refer to  FIG. 8 , which is a schematic diagram of a sub-pixel group SPG 5  according to an embodiment of the present invention. The sub-pixel group SPG 5  is similar to the sub-pixel group SPG 1  shown in  FIG. 3 , thus the components and the signals with the similar functions use the same symbols. In comparison with the sub-pixel group SPG 1  shown in  FIG. 3 , the sub-pixels SP 3  and SP 4  of the sub-pixel group SPG 5  are changed to locate at the i row and the sub-pixel SP 5  of the sub-pixel group SPG 5  is changed to locate at the i+1 row. That is, the positions of the sub-pixels SP 3  and SP 4  exchange with that of the sub-pixel SP 5  in the sub-pixel group SPG 5 . 
         [0042]    Note that, the arrangement methods and/or the color configuration method of the sub-pixels in the sub-pixel groups located at the adjacent rows may be different. For example, the sub-pixel groups located at the adjacent rows maybe the sub-pixel groups SPG 1  shown in  FIG. 3  and the sub-pixel group SPG 5  shown in  FIG. 8 , respectively. According to different applications and design concepts, those skilled in the art may observe appropriate alternations and modifications. 
         [0043]    The driving module (e.g. a driving integrated chip (IC)) of the display device may need to be appropriately altered according to the sub-pixel arrangement of the above embodiments. Please jointly refer to  FIG. 6  and  FIG. 9 , wherein  FIG. 9  is a schematic diagram of a circuitry layout of the display device  60  shown in  FIG. 6 . As shown in  FIG. 9 , the display device  60  comprises a driving module DRI and a plurality of sub-pixel groups SPG 1 . The driving module DRI comprises a column driving unit CD and a row driving unit RD, which are utilized for driving data lines DL 1 -DLx and scan lines SLm-SLy, respectively. Note that,  FIG. 9  only shows the data line DLn-DLn+15, the scan lines SLm-SLm+4 and parts of the plurality of sub-pixel groups SPG 1  for illustrations. In the sub-pixel group SPG 1  at the left-top corner, the sub-pixel SP 1  is coupled to the data line DLn and the scan line SLm+1; the sub-pixel SP 2  is coupled to the data line DLn+1 and the scan line SLm+1; the sub-pixel SP 3  is coupled to the data line DLn+3 and the scan line SLm+1; the sub-pixel SP 4  is coupled to the data line DLn+4 and the scan line SLm+1; and the sub-pixel SP 5  is coupled to the data line DLn+2 and the scan line SLm. In brief, the sub-pixels SP 1 -SP 4  of the sub-pixel group SPG 1  are coupled to the same scan line (e.g the scan line SLm+1), the sub-pixel SP 5  of the sub-pixel group SPG 1  is coupled to an adjacent scan line (e.g. the scan line SLm), and the sub-pixels SP 1 -SP 5  are respectively coupled to the closest data lines. 
         [0044]    Note that, the relationship between the sub-pixels SP 5  of the sub-pixel groups SPG 1  located at the adjacent rows and the data lines may be different. As shown in  FIG. 9 , the sub-pixel SP 5  of another sub-pixel group SPG 1  located at bottom-left of the sub-pixel group SPG 1  at the left-top corner changes to be coupled to the data line DLn+2, which is adjacent to data line DLn+1 coupled to the sub-pixel SP 4  of the same sub-pixel group SPG 1 . In such a condition, the sub-pixels SP 5  of the sub-pixel groups SPG 1  located at the adjacent rows are coupled to the same data line, so as to decrease the number of data lines for realizing the display device  60 . According to the coupling relationships between the sub-pixels and data lines shown in  FIG. 9 , the number of data lines in the display device  60  realized by repeatedly configuring the sub-pixel group SPG 1  can be reduced and the layout space in the display device  60  is therefore increased. 
         [0045]    Please refer to  FIG. 10 , which is a schematic diagram of a display device  100  according to an embodiment of the present invention. The display device  100  may be an electronic product with a liquid crystal panel, such as a television, a smart phone or a tablet.  FIG. 10  only shows parts of sub-pixels of the display device  100  for illustrations. Note that,  FIG. 10  is utilized for illustrating the relative positions of the sub-pixels and not for limiting the ratio between length and width. As shown in  FIG. 10 , the display device  100  comprises a plurality of repeating sub-pixel groups SPG 6  (only one sub-pixel group SPG 6  is marked in  FIG. 10  for illustrations). In order to simplify the descriptions, please refer to  FIG. 11  which is a schematic diagram of the sub-pixel group SPG 6  shown in  FIG. 10 . In  FIG. 11 , the sub-pixel group SPG 6  comprises sub-pixels SP 11 -SP 16 . The sub-pixel SP 11  is located at the j column, the i row and the i+1 row; the sub-pixel SP 12  is located at the j+1 column and the i+1 row; the sub-pixel SP 13  is located at the j+2 column and the i+1 row; the sub-pixel SP 14  is located at the j+3 column and the i+1 row; the sub-pixel SP 15  is located at the j+1 column and the i row; the sub-pixel SP 16  is located at the j+2, j+3 column and the i row. The height of the sub-pixel SP 12  may be different from or equal to that of the sub-pixel SP 15  and the height of the sub-pixel SP 16  may be different from or equal to the heights of the sub-pixels SP 13  and SP 14 . According to the sub-pixel arrangement method shown in  FIG. 11 , the sub-pixel group SPG 6  is corresponding to 2 pixels. That is, a number of the sub-pixels form a pixel is reduced. The aperture ratio of display device  100  is increased and the power consumption of the display device  100  is decreased, therefore. 
         [0046]    In details, the height of the sub-pixel SP 11  is a height L 4 , the sub-pixels SP 12 -SP 14  may have a same height L 5  and the sub-pixels SP 15  and SP 16  may have a same height L 6 . The height L 5  is greater than or equal to the height L 6  and the height L 4  is different from or equal to a sum of the heights L 5  and L 6 . In other words, the rows of the sub-pixels SP 12 -SP 16  overlap that of the sub-pixel SP 11 . 
         [0047]    In this embodiment, the sub-pixels SP 11 -SP 16  are corresponding to blue, green, red, green, white and white, respectively. Via adding the sub-pixels SP 15 , SP 16  corresponding to white, the brightness of the display device  20  increases and the power consumption of the display device  20  decreases. According to different applications and design concepts, the colors corresponding to the sub-pixels SP 11 -SP 16  in the sub-pixel group SPG 6  maybe altered and is not limited to those shown in  FIG. 11 . For example, the sub-pixels SP 11 -SP 16  may be altered to be corresponding to green, blue, green, red, white and white. In this embodiment, the sub-pixels SP 11  and SP 13  corresponding to green have different areas. In another embodiment, the sub-pixels SP 15  and SP 16  maybe changed to be corresponding to other color different from red, blue and green (e.g. yellow). In still another embodiment, the sub-pixels SP 11 -SP 16  maybe corresponding to more than  4  colors. That is, the sun-pixels SP 11 -SP 16  in the sub-pixel group SPG 6  are corresponding to at least four colors. 
         [0048]    As to the relationships between pixels and the sub-pixels SP 11 -SP 16  in the sub-pixel group SPG 6  please refer to the followings. As shown in  FIG. 11 , the sub-pixels SP 11 , SP 12 , SP 15  are corresponding to a pixel and the sub-pixels SP 13 , SP 14 , SP 16  are corresponding to another pixel. If the problem of lacking colors occurs when the sub-pixels SP 11 , SP 12 , SP 15  or the sub-pixels SP 13 , SP 14 , SP 16  display the corresponding pixel, the display device  100  may adopt the algorithm (e.g. the sub-pixel rendering algorithm) to borrow colors from adjacent sub-pixels, so as to completely display the corresponded pixel. In the sub-pixel group SPG 6 , 6 sub-pixels form 2 pixels and the average number of the sub-pixels corresponding to a pixel is decreased to 3. If the resolution of the display device  100  is fixed, the number of the sub-pixels utilized for realizing the display device  100  would be reduced and the aperture ratio of the display device  100  would be accordingly increased. 
         [0049]    In an embodiment, a vertical displacement may exist between the sub-pixels of the display device  100  shown in  FIG. 10 . Please refer to  FIG. 12 , which is a schematic diagram of a display device  120  according to an embodiment of the present invention. The display device  120  maybe an electronic product with a liquid crystal panel, such as a television, a smart phone or a tablet.  FIG. 12  only shows parts of sub-pixels of the display device  120  for illustrations. Note that,  FIG. 12  is utilized for illustrating the relative positions of the sub-pixels and not for limiting the ratio between length and width. As shown in  FIG. 12 , the display device  120  comprises a plurality of repeating sub-pixel groups SPG 7  (only one sub-pixel group SPG 7  is marked in  FIG. 12  for illustrations). In order to simplify the descriptions, please refer to  FIG. 13  which is a schematic diagram of the sub-pixel group SPG 7  shown in  FIG. 12 . In  FIG. 13 , the sub-pixel group SPG 7  comprises sub-pixels SP 17 -SP 22 . Different from the sub-pixel group SPG 6  shown in  FIG. 11 , the sub-pixels SP 19 , SP 20  and SP 22  are shifted downwards a vertical displacement V 3 . Thus, the sub-pixel SP 22  locates at the j+2, j+3 column and the i+1 row, the sub-pixel SP 19  locates at the j+2 column and the i+2 row, and the sub-pixel SP 20  locates at the j+3 column and the i+2 row. According to the sub-pixel arrangement method shown in  FIG. 13 , the sub-pixel group SPG 7  is corresponding to 2 pixels. The aperture ratio of display device  120  is increased therefore. The colors and the length-width relationships between the sub-pixels SP 17 -SP 22  of the sub-pixel group SPG 7  can be referred to the sub-pixels SP 11 -SP 16  of the sub-pixel group SPG 6 , and are not narrated herein for brevity. 
         [0050]    In the sub-pixel group SPG 7  shown in  FIG. 13 , the rows of the sub-pixels SP 18 , SP 21 , SP 22  overlap that of the sub-pixel SP 17  and the rows of the sub-pixels SP 19 , SP 20  overlaps of that of the sub-pixel SP 17 . According to different applications and design concepts, the arrangement of the sub-pixels SP 17 -SP 22  may be appropriately altered. For example, the sub-pixels SP 19 , SP 20 , SP 22  may change to be shifted upwards, such that only the rows of the sub-pixels SP 19  and SP 20  overlap that of the sub-pixel SP 17 . Similarly, the sub-pixels SP 18  and SP 21  may be shifted vertically. That is, at least one of the rows of the sub-pixels located at the same column in the sub-pixel group SPG 7  overlap the row of the sub-pixel SP 17 . 
         [0051]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 6  located at the adjacent rows in the display device  100  shown in  FIG. 10 . Please refer to  FIG. 14 , which is a schematic diagram of a display device  140  according to an embodiment of the present invention. The display device  140  is similar to the display device  100  shown in  FIG. 10 , thus the components and the signals with the same functions use the same symbols. Different from the display device  100 , a horizontal displacement W 2  exists between the sub-pixel groups SPG 6  located at the adjacent rows (e.g. the sub-pixel groups SPG 6  located at the i row and the i+1 row and those located at the i+2 row and the i+3 row). In this embodiment, the horizontal displacement W 1  is half of the width of the sub-pixel group SPG 6 . As a result, the display device  140  equipping different sub-pixel arrangement can be realized by the sub-pixel group SPG 6 . In addition, a sub-pixel group SPG 8  shown in  FIG. 14  can be regarded as a repeating sub-pixel group. In other words, the display device  140  shown in  FIG. 14  can be realized by repeatedly configuring the sub-pixel group SPG 8 . 
         [0052]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 6  located at the adjacent rows and a vertical displacement may exist between sub-pixels in the display device  100  shown in  FIG. 10 . Please refer to  FIG. 15 , which is a schematic diagram of a display device  150  according to an embodiment of the present invention. The display device  150  is similar to the display device  140  shown in  FIG. 14 , thus the components and the signals with the same functions use the same symbols. Different from the display device  140 , the sub-pixels of the j+2, j+3, j+6, j+7, j+10 and j+11 are shifted downwards a vertical displacement V 4 . In addition, a sub-pixel group SPG 9  shown in  FIG. 15  can be regarded as a repeating sub-pixel group. In other words, the display device  150  shown in  FIG. 15  can be realized by repeatedly configuring the sub-pixel group SPG 9 . 
         [0053]    In an embodiment, the arrangement of the sub-pixels SP 11 -SP 16  in the sub-pixel group SPG 6  may be appropriately modified. Please refer to  FIG. 16 , which is a schematic diagram of a sub-pixel group SPG 10  according to an embodiment of the present invention. The sub-pixel group SPG 10  is similar to the sub-pixel group SPG 6  shown in  FIG. 11 , thus the components and signals with the same functions use the same symbols. In comparison with the sub-pixel group SPG 6  shown in  FIG. 11 , the sub-pixels SP 12 , SP 15  of the sub-pixel group SPG 10  change to be at the j+3 column and the sub-pixels SP 13 , SP 14 , SP 16  of the sub-pixel group SPG 10  change to be at the j+1, j+2 columns. That is, the positions of the sub-pixels SP 12 , SP 15  exchange with those of the sub-pixels SP 13 , SP 14 , SP 16  in the sub-pixel group SPG 10  . 
         [0054]    Note that, the arrangement method and the colors of the sub-pixels in the sub-pixel groups located at adjacent rows may be different. For example, the sub-pixel groups located at adjacent rows in the display device may be the sub-pixel groups SPG 6  shown in  FIG. 11  and the sub-pixel groups SPG 10  shown in  FIG. 16 , respectively. According to different applications and design concepts, those with ordinary skill in the art may observe appropriate alternations and modifications. 
         [0055]    The driving module (e.g. a driving integrated chip (IC)) of the display device may need to be appropriately altered according to the sub-pixel arrangement of the above embodiments. Please jointly refer to  FIG. 14  and  FIG. 17 , wherein  FIG. 17  is a schematic diagram of a circuit layout of the display device  140  shown in  FIG. 14 . As shown in  FIG. 17 , the display device  140  comprises a driving module DRI and a plurality of sub-pixel groups SPG 6 . The driving module DRI comprises a column driving unit CD and a row driving unit RD, which are utilized for driving data lines DL 1 -DLx and scan lines SLm-SLy, respectively. Note that,  FIG. 17  only shows the data line DLn-DLn+17, the scan lines SLm-SLm+4 and parts of the plurality of sub-pixel groups SPG 6  for illustrations. In the sub-pixel group SPG 6  at the left-top corner, the sub-pixels SP 11 -SP 14  are coupled to the scan line SLm+1 and the sub-pixels SP 15 , SP 16  are coupled to the scan line SLm adjacent to the scan line SLm+1. The sub-pixels SP 11 -SP 16  are coupled to the data lines DLn, DLn+1, DLn+3, DLn+4, DLn+2, DLn+5, respectively. Note that, the data line DLn+2, which is coupled to the sub-pixel SP 15  of the left-top sub-pixel group SPG 6 , is coupled to the sub-pixel SP 16  of the sub-pixel group SPG 6  at the adjacent row. The data line DLn+5, which is coupled to the sub-pixel SP 16  of the left-top sub-pixel group SPG 6 , is coupled to the sub-pixel SP 15  of the sub-pixel group SPG 6  at the adjacent row. According to coupling relationships between the sub-pixels and data lines shown in  FIG. 17 , the number of data lines for realizing the display device  140  can be decreased and the layout space of the display device  140  can be further increased. 
         [0056]    Please jointly refer to  FIG. 14  and  FIG. 18 , wherein  FIG. 18  is a schematic diagram of a circuit layout of the display device  140  shown in  FIG. 14 . As shown in  FIG. 18 , the display device  140  comprises a driving module DRI and a plurality of sub-pixel groups SPG 6 . The driving module DRI comprises a column driving unit CD and a row driving unit RD, which are utilized for driving data lines DL 1 -DLx and scan lines SLm-SLy, respectively. Note that,  FIG. 18  only shows the data line DLn-DLn+17, the scan lines SLm-SLm+4 and parts of the plurality of sub-pixel groups SPG 6  for illustrations. In the sub-pixel group SPG 6  at the left-top corner, the sub-pixels SP 11 -SP 14  are coupled to the scan line SLm+1 and the sub-pixels SP 15 , SP 16  are coupled to the scan line SLm adjacent to the scan line SLm+1. Different from  FIG. 17 , the sub-pixels SP 11 -SP 16  are coupled to the data lines DLn, DLn+1, DLn+3, DLn+5, DLn+1, DLn+5, respectively. That is, the sub-pixels SP 12 , SP 15  are coupled to the same data line DLn+1 and the sub-pixels SP 14 , SP 16  are coupled to the same data line DLn+5. In addition, the data line DLn+2, which is between the data line DLn+1 coupled to the sub-pixels SP 12 , SP 15  and the data line DLn+3 coupled to the sub-pixels SP 13  of the left-top sub-pixel group SPG 6 , is coupled to the sub-pixels SP 14 , SP 16  of the sub-pixel group SPG 6  at the adjacent row. The data line DLn+4, which is between the data line DLn+3 coupled to the sub-pixel SP 13  and the data line DLn+5 coupled to the sub-pixels SP 14 , SP 16  of the left-top sub-pixel group SPG 6 , is coupled to the sub-pixels SP 12 , SP 15  of the sub-pixel group SPG 6  at the adjacent row. According to coupling relationships between the sub-pixels and data lines shown in  FIG. 18 , the number of data lines for realizing the display device  140  can be decreased and the layout space of the display device  140  can be further increased. 
         [0057]    Please jointly refer to  FIG. 14  and  FIG. 19 , wherein  FIG. 19  is a schematic diagram of a circuit layout of the display device  140  shown in  FIG. 14 . As shown in  FIG. 19 , the display device  140  comprises a driving module DRI and a plurality of sub-pixel groups SPG 6 . The driving module DRI comprises a column driving unit CD and a row driving unit RD, which are utilized for driving data lines DL 1 -DLx and scan lines SLm-SLy, respectively. Note that,  FIG. 19  only shows the data line DLn-DLn+17, the scan lines SLm-SLm+4 and parts of the plurality of sub-pixel groups SPG 6  for illustrations. Similar to  FIG. 17 , the sub-pixels SP 11 -SP 14  are coupled to the scan line SLm+1 and the sub-pixels SP 15 , SP 16  are coupled to the scan line SLm adjacent to the scan line SLm+1 in the sub-pixel group SPG 6  at the left-top corner. Different from  FIG. 17 , the sub-pixels SP 11 -SP 16  are coupled to the data lines DLn+1, DLn+2, DLn+3, DLn+4, DLn+2, DLn+3, respectively. That is, the sub-pixels SP 12 , SP 15  are coupled to the same data line DLn+2 and the sub-pixels SP 13 , SP 16  are coupled to the same data line DLn+3. In addition, the data line DLn, which is adjacent to the data line DLn+1 coupled to the sub-pixel SP 11  of the left-top sub-pixel group SPG 6 , is coupled to the sub-pixels SP 13 , SP 16  of the sub-pixel group SPG 6  at the adjacent row. The data line DLn+5, which is adjacent to the data line DLn+4 coupled to the sub-pixel SP 14  of the left-top sub-pixel group SPG 6 , is coupled to the sub-pixels SP 12 , SP 15  of the sub-pixel group SPG 6  at the adjacent row. According to coupling relationships between the sub-pixels and data lines shown in  FIG. 19 , the number of data lines for realizing the display device  140  can be decreased and the layout space of the display device  140  can be further increased. 
         [0058]    To sum up, the above embodiments reduce the number of sub-pixels for realizing the display device via altering the sub-pixel arrangement in the display device, so as to increase the aperture ratio and to decrease the power consumption and the layout area of the display device. Moreover, the brightness of the display device is increased and the power consumption is further decreased via adding the sub-pixels corresponding to white. 
         [0059]    Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.