Abstract:
A display device including a plurality sub-pixel groups is disclosed. Each of the plurality sub-pixel groups includes a first sub-pixel, locating at a first column, a first row and a second row adjacent to the first row; a second sub-pixel, locating at a second column adjacent to the first column, the first row and the second row; a third sub-pixel locating at a third column adjacent to the second column and a first row; and a fourth sub-pixel locating at the third column and the second row.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is a continuation application of U.S. application Ser. No. 14/641,430, the contents of which are incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
     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. 
       2. Description of the Prior Art 
       [0003]    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. 
         [0004]    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. 
         [0005]    For example, under a condition that the visual acuity of the eyes is 1.0 and a distance between the eyes and the LCD is 12 inches, the eyes 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 
       [0006]    In order to solve the above problem, the present invention provides a reducing power consumption and increasing brightness via changing pixel arrangement method and driving module thereof. 
         [0007]    In an embodiment, the present invention discloses a display device, comprising a plurality of sub-pixel groups having the same sub-pixel pattern, wherein the plurality of sub-pixel groups comprise a first sub-pixel group, at least one second sub-pixel group located at the same columns as the first column and at least one third sub-pixel group located at the same rows as the first sub-pixel group. The first sub-pixel group comprises a first sub-pixel, locating at a first column, a first row and a second row adjacent to the first row; a second sub-pixel, locating at a second column adjacent to the first column, the first row and the second row; a third sub-pixel locating across a third column adjacent to the second column and a fourth column adjacent to the third column; and a fourth sub-pixel locating across the third column and the fourth column; wherein the third sub-pixel and the fourth sub-pixel locate at two neighboring rows that comprise at least one of the first row and the second row. 
         [0008]    In another embodiment, the present invention discloses a driving module, for a display device comprising a plurality of sub-pixel groups having the same sub-pixel pattern, wherein the plurality of sub-pixel groups comprise a first sub-pixel group, at least one second sub-pixel group located at the same columns as the first column and at least one third sub-pixel group located at the same rows as the first sub-pixel group. The first sub-pixel group comprises a first sub-pixel, locating at a first column, a first row and a second row adjacent to the first row; a second sub-pixel, locating at a second column adjacent to the first column and the first row and the second row; a third sub-pixel locating at a third column adjacent to the second column and a fourth column adjacent to the third column; and a fourth sub-pixel locating across the third column and the fourth column; wherein the third sub-pixel and the fourth sub-pixel locate at two neighboring rows that comprise at least one of the first row and the second row. 
         [0009]    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 
         [0010]      FIG. 1  is a schematic diagram of the relationship between the image quality and the pixel per inch. 
           [0011]      FIG. 2  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0012]      FIG. 3  is a schematic diagram of the sub-pixel group shown in  FIG. 2 . 
           [0013]      FIG. 4  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0014]      FIG. 5  is a schematic diagram of the sub-pixel group shown in  FIG. 4 . 
           [0015]      FIG. 6  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0016]      FIG. 7  is a schematic diagram of the sub-pixel group shown in  FIG. 6 . 
           [0017]      FIG. 8  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0018]      FIG. 9  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0019]      FIG. 10  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0020]      FIG. 11  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0021]      FIG. 12  is a schematic diagram of the sub-pixel group shown in  FIG. 11 . 
           [0022]      FIG. 13  is a schematic diagram of circuit layout of the display device shown in  FIG. 9 . 
           [0023]      FIG. 14  is a schematic diagram of circuit layout of the display device shown in  FIG. 11 . 
           [0024]      FIG. 15  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0025]      FIG. 16  is a schematic diagram of the sub-pixel group shown in  FIG. 15 . 
           [0026]      FIG. 17  is a schematic diagram of another color arrangement method of the sub-pixel group shown in  FIG. 16 . 
           [0027]      FIG. 18  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0028]      FIG. 19  is a schematic diagram of a display device according to an embodiment of the present invention. 
           [0029]      FIG. 20  is a schematic diagram of circuit layout of the display device shown in  FIG. 19 . 
           [0030]      FIG. 21  is a schematic diagram of another implementation of the display device shown in  FIG. 8 . 
           [0031]      FIGS. 22A-22C  are schematic diagrams of other implementations of the display device shown in  FIG. 19 . 
       
    
    
     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 device with a liquid crystal panel, such as a television, a smart phone or a tablet.  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 repeating 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 4 . The sub-pixel SP 1  is located at the j column, the i row and the i+1 row and the sub-pixel SP 2  is located at the j+1 column, the i row and the i+1 row. On the other hand, the sub-pixels SP 3  and SP 4  are transversely located at the j+2 column and the j+3 column (the j+2 column and the j+3 column may be regarded as a single column) and are respectively located at the i row and the i+1 row. Via the abovementioned arrangement of the sub-pixels SP 1 -SP 4 , 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, to increase the aperture ratio of display device  20  and to decrease the power consumption of the display device  20 . 
         [0034]    In detail, the sub-pixels SP 1  and SP 2  may have a same height L 1  and the height L 1  is greater than a height L 2  of the sub-pixel SP 4  and a height L 3  of the sub-pixel SP 4 . Since the sub-pixels SP 3  and SP 4  can be regarded as transversely located sub-pixels SP 1  and SP 2 , a length L 4  of the sub-pixels SP 3  and SP 4  is also greater than the heights L 2  and L 3 . Further, the sub-pixels SP 1 -SP 4  correspond to blue, white, red and green, respectively. Via adding the sub-pixel SP 2  corresponding to white, the brightness of the display device  20  increases and the power consumption of the display device  20  decreases. Moreover, the sub-pixel group SPG 1  is corresponding to 2 pixels and each pixel is corresponding to 2 sub-pixels according to the arrangement shown in  FIG. 3 . In this embodiment, the sub-pixels SP 1  and SP 2  form a pixel and the sub-pixels SP 3  and SP 4  form another pixel. If the resolution of the display device  20  is constant, the number of the sub-pixels utilized for realizing the display device  20  would be reduced and the aperture ratio of the display device  20  would be accordingly increased. 
         [0035]    In another embodiment, the sub-pixel SP 2  may be corresponding to other colors, such as yellow. Further, the sub-pixel SP 2  may be corresponding to one of the colors corresponding to the sub-pixels SP 1 , SP 3  and SP 4 . That is, the sub-pixels SP 1 -SP 4  are corresponding to at least three colors. Note that, the sequence of the colors corresponding to the sub-pixels SP 1 -SP 4  may be modified according to different applications and design concepts and are not limited to the color sequence shown in  FIG. 3 . For example, the sub-pixels SP 1 -SP 4  may be changed to be corresponding to red, white, green and blue, and are not limited herein. 
         [0036]    As to the polarity arrangement of the sub-pixels SP 1 -SP 4  of the sub-pixel group SPG 1  please refer to the following descriptions. Since the sub-pixels SP 1  and SP 2  are corresponding to the same pixel, the polarity of the sub-pixel SP 1  is opposite to that of the sub-pixel SP 2 . For example, the polarity of the sub-pixel SP 2  is negative when the polarity of the sub-pixel SP 1  is positive; and the polarity of the sub-pixel SP 2  is positive when the polarity of the sub-pixel SP 1  is negative. Similarly, since the sub-pixels SP 3  and SP 4  are corresponding to the same pixel, the polarity of the sub-pixel SP 3  is opposite to that of the sub-pixel SP 4 . 
         [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 device with a liquid crystal panel, such as a television, a smart phone or a tablet.  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 repeating 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 5 -SP 8 . The sub-pixel SP 5  is located at the j column, the i row and the i+1 row and the sub-pixel SP 6  is located at the j+1 column, the i row and the i+1 row. On the other hand, the sub-pixels SP 7  and SP 8  are transversely located at the j+2 column and the j+3 column. Different from the sub-pixel group SPG 1  shown in  FIG. 3 , the transverse sub-pixels SP 7  and SP 8  are shifted upward and are located at the i−1 row and the i row, respectively. Via the abovementioned arrangement of the sub-pixels SP 5 -SP 8 , 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 5 -SP 8  of the sub-pixel group SPG 2  can be referred to the sub-pixels SP 1 -SP 4  of the sub-pixel group SPG 1 , and are not narrated herein for brevity. 
         [0038]    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  may be an electronic device with a liquid crystal panel, such as a television, a smart phone or a tablet.  FIG. 6  only shows parts of sub-pixels of the display device  60  for illustrations. Note that,  FIG. 6  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. 6 , the display device  60  comprises a plurality of repeating sub-pixel groups SPG 3  (only one sub-pixel group SPG 3  is marked in  FIG. 6  for illustrations). In order to simplify the descriptions, please refer to  FIG. 7  which is a schematic diagram of the sub-pixel group SPG 3  shown in  FIG. 6 . In  FIG. 6 , the sub-pixel group SPG 3  comprises sub-pixels SP 9 -SP 12 . The sub-pixel SP 9  is located at the j column, the i row and the i+1 row and the sub-pixel SP 10  is located at the j+1 column, the i row and the i+1 row. On the other hand, the sub-pixels SP 11  and SP 12  are transversely located at the j+2 column and the j+3 column. Different from the sub-pixel group SPG 1  shown in  FIG. 3 , the transverse sub-pixels SP 11  and SP 12  are shifted downward and are located at the i+1 row and the i+2 row, respectively. Via the abovementioned arrangement of the sub-pixels SP 5 -SP 8 , the sub-pixel group SPG 3  is corresponding to two pixels and the aperture ratio of the display device  60  is accordingly increased. The colors and the length-width relationships between the sub-pixels SP 9 -SP 12  of the sub-pixel group SPG 3  can be referred to the sub-pixels SP 1 -SP 4  of the sub-pixel group SPG 1 , and are not narrated herein for brevity. 
         [0039]    In brief, the upright sub-pixels of the sub-pixel group (e.g. the sub-pixels SP 1  and SP 2 , SP 5  and SP 6  or SP 9  and SP 10 ) are located at the rows overlapping at least one of the transverse sub-pixels of the sub-pixel group (e.g. the sub-pixels SP 3  and SP 4 , SP 7  and SP 8  or SP 11  and SP 12 ). 
         [0040]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 1  located at adjacent rows in the display device  20  shown in  FIG. 2 . Please refer to  FIG. 8 , which is a schematic diagram of a display device  80  according to an embodiment of the present invention. The display device  80  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  located 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 one-fourth of the width of the sub-pixel group SPG 1 . As a result, the display device  80  equipping different sub-pixel arrangement can be realized by the sub-pixel group SPG 1 . 
         [0041]    Please refer to  FIG. 9 , which is schematic diagram of a display device  90  according to an embodiment of the present invention. The display device  90  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 2  exists between the sub-pixel groups SPG 1  located 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 2  is half of the width of the sub-pixel group SPG 1 . Note that, a sub-pixel group SPGC 1  shown in  FIG. 9  can be regarded as the repeated sub-pixel group in this embodiment. As a result, the display device  90  equipping different sub-pixel arrangement can be realized by the sub-pixel group SPG 1 . 
         [0042]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 1  located at the adjacent rows and a vertical displacement may exist between sub-pixels in the display device  20  shown in  FIG. 2 . 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 device with a liquid crystal panel, such as a television, a smart phone or a tablet. As shown in  FIG. 10 , the sub-pixel groups located at the adjacent rows are the sub-pixel group SPG 2  and the sub-pixel group SPG 3  shown in  FIG. 7 , respectively. As a result, the display device  100  equips the sub-pixel arrangement different from that of the display device  20 . 
         [0043]    In order to simplify the complexity of the circuit layout in the display device, the sub-pixels of the repeating sub-pixel groups may be divided into multiple secondary sub-pixels. Please refer to  FIG. 11 , which is a schematic diagram of a display device  110  according to an embodiment of the present invention. The display device  110  may be an electronic device with a liquid crystal panel, such as a television, a smart phone or a tablet.  FIG. 11  only shows parts of sub-pixels of the display device  110  for illustrations. Note that,  FIG. 11  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. 11 , the display device  110  comprises a plurality of repeating sub-pixel groups SPG 4  (only one sub-pixel group SPG 4  is marked in  FIG. 11  for illustrations). In order to simplify the descriptions, please refer to  FIG. 12  which is a schematic diagram of the sub-pixel group SPG 4  shown in  FIG. 11 . In  FIG. 12 , the sub-pixel group SPG 4  comprises sub-pixels SP 13 -SP 16  and the arrangement of the sub-pixels SP 13 -SP 16  is similar to that of the sub-pixels SP 1 -SP 4  shown in  FIG. 3 . In comparison with the sub-pixel group SPG 1  shown in  FIG. 3 , the sub-pixel SP 13  of the sub-pixel group SPG 4  is divided into secondary sub-pixels SP 13 A and SP 13 B; and the sub-pixel SP 14  is divided into secondary sub-pixels SP 14 A and SP 14 B. In this embodiment, the colors of the secondary sub-pixels SP 13 A and SP 13 B equal that of the sub-pixel SP 13  and the colors of the secondary sub-pixels SP 14 A and SP 14 B also equal that of the sub-pixel SP 14 . Via dividing the sub-pixels SP 13  and SP 14 , the aperture ratio of the display device  110  is further improved. 
         [0044]    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. 3  and  FIG. 13 , wherein  FIG. 13  is a schematic diagram of a circuit layout of the display device  90  shown in  FIG. 9 . As shown in  FIG. 13 , the display device  90  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. 13  only shows the data line DLn-DLn+9, 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 upper left corner, the sub-pixel SP 1  is coupled to the data line DLn and the scan line SLm; 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+2 and the scan line SLm; and the sub-pixel SP 4  is coupled to the data line DLn+3 and the scan line SLm+1. The relationships between the data lines DLn-DLn+9, the scan lines SLm-SLm+4 and the rest of the sub-pixel groups SPG 1  in  FIG. 13  can be acquired by analogy. In brief, the sub-pixels SP 1  and SP 3  are coupled to the same scan line (e.g. the scan line SLm) and the sub-pixels SP 2  and SP 4  are coupled to another adjacent scan line (e.g. the scan line SLm+1). In addition, the sub-pixels SP 1 -SP 4  of the sub-pixel group SPG 1  are respectively coupled to the nearest data lines. As a result, the circuit layout of the display device  90  realized by repeatedly arranging the sub-pixel group SPG 1  can be optimized. 
         [0045]    Please jointly refer to  FIG. 12  and  FIG. 14 , wherein  FIG. 14  is a schematic diagram of a circuit layout of the display device  110  shown in  FIG. 11 . As shown in  FIG. 14 , the display device  110  comprises a driving module DRI and a plurality of sub-pixel groups SPG 4 . 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. 14  only shows the data line DLn-DLn+9, scan lines SLm-SLm+4 and parts of the plurality of sub-pixel groups SPG 4  for illustrations. In the sub-pixel group SPG 4  at the upper left corner, the secondary sub-pixels SP 13 A and SP 13 B are coupled to the data line DLn and the scan line SLm; the secondary sub-pixels SP 14 A and SP 14 B are coupled to the data line DLn+1 and the scan line SLm; the sub-pixel SP 15  is coupled to the data line DLn+2 and the scan line SLm; and the sub-pixel SP 16  is coupled to the data line DLn+3 and the scan line SLm. The relationships between the data lines DLn-DLn+9, the scan lines SLm-SLm+4 and the rest of the sub-pixel groups SPG 4  in  FIG. 14  can be acquired by analogy. In comparison with the display device  90  shown in  FIG. 13 , the sub-pixels SP 13 -SP 16  are coupled to the same scan line (e.g. the scan line SLm). As a result, the circuit layout of the display device  110  realized by repeatedly arranging the sub-pixel group SPG 4  can be optimized. 
         [0046]    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  may be an electronic device with a liquid crystal panel, such as a television, a smart phone or a tablet.  FIG. 15  only shows parts of sub-pixels of the display device  150  for illustrations. Note that,  FIG. 15  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. 15 , the display device  150  comprises a plurality of repeating sub-pixel groups SPG 5  (only one sub-pixel group SPG 5  is marked in  FIG. 15  for illustrations). In order to simplify the descriptions, please refer to  FIG. 16  which is a schematic diagram of the sub-pixel group SPG 5  shown in  FIG. 15 . In  FIG. 16 , the sub-pixel group SPG 5  comprises sub-pixels SP 17 -SP 23 . The sub-pixel SP 17  is located at the j column, the i row and the i+1 row; the sub-pixel SP 18  is transversely located at the j+1 column, the j+2 column and the i row; the sub-pixel SP 19  is transversely located at the j+1 column, the j+2 column and the i+1 row; the sub-pixel SP 20  is located at the j+3 column, the i row and the i+1 row; the sub-pixel SP 21  is located at the j+4 column, the i row and the i+1 row; the sub-pixel SP 22  is located at the j+5 column, the i row and the i+1 row; and the sub-pixel SP 23  is located at the j+6 column, the i row and the i+1 row. In addition, the adjacent sub-pixels in the sub-pixel group SPG 5  are corresponding to different colors. In this embodiment, the sub-pixels SP 17 -SP 23  are corresponding to blue, red, green, blue, green, red and green, respectively. In such a condition, the sub-pixels SP 17 -SP 19  and SP 18 - 20  respectively generate virtual pixels (i.e. 4 sub-pixels are corresponding to 2 pixels) and sub-pixels SP 20 - 22 , SP 21 -SP 23 , and SP 22 - 23  and SP 17  of the sub-pixel group SPG 5  located at the adjacent columns generate real pixels (i.e. 3 sub-pixels corresponding to 1 pixel). Via the arrangement shown in  FIG. 16 , the sub-pixel group SPG 5  generates 4 pixels via 7 sub-pixels. Under the condition that the resolution of the display device  150  is constant, the number of the sub-pixels utilized for realizing the display device  150  is reduced and the aperture ratio of the display device  150  is accordingly increased. 
         [0047]    According to different applications and design concepts, the colors of the sub-pixels SP 17 -SP 23  in the sub-pixel group SPG 5  can be appropriately altered. Please refer to  FIG. 17 , which is a schematic diagram of another color configuration of the sub-pixel group SPG  5  shown in  FIG. 16 . Different from  FIG. 16 , the sub-pixel  19  of the sub-pixel group SPG 5  shown in  FIG. 17  is changed to be corresponding to white. In another embodiment, the sub-pixel SP 19  is corresponding to yellow. That is, the sub-pixels SP 17 -SP 23  are corresponding to at least three colors and the adjacent sub-pixels in the sub-pixel group SPG 5  are corresponding to different colors. 
         [0048]    In an embodiment, a horizontal displacement may exist between the sub-pixel groups SPG 5  located at the adjacent rows in the display device  150  shown in  FIG. 15 . Please refer to  FIG. 18 , which is a schematic diagram of a display device  180  according to an embodiment of the present invention. The display device  180  is similar to the display device  150  shown in  FIG. 15 , thus the components and the signals with the same functions use the same symbols. Different from the display device  150 , a horizontal displacement W 3  exists between the sub-pixel groups SPG 5  located at the adjacent rows (e.g. the sub-pixel groups SPG 5  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 3  is three-seventh of the width of the sub-pixel group SPG 5 . Note that, a sub-pixel group SPGC 2  shown in  FIG. 18  can be regarded as the repeating sub-pixel group of the display device  180 . As a result, the display device  180  equips different sub-pixel arrangement can be realized by the sub-pixel group SPG 5  (or the sub-pixel group SPGC 2 ). 
         [0049]    Please refer to  FIG. 19 , which is a schematic diagram of a display device  190  according to an embodiment of the present invention. The display device  190  is similar to the display device  150  shown in  FIG. 15 , thus the components and the signals with the same functions use the same symbols. Different from the display device  150 , a horizontal displacement W 4  exists between the sub-pixel groups SPG 5  located at the adjacent rows (e.g. the sub-pixel groups SPG 5  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 4  is four-seventh of the width of the sub-pixel group SPG 5 . Note that, a sub-pixel group SPGC 3  shown in  FIG. 19  can be regarded as the repeating sub-pixel group of the display device  190 . As a result, the display device  190  equips different sub-pixel arrangement can be realized by the sub-pixel group SPG 5  (or the sub-pixel group SPGC 3 ). 
         [0050]    Please note that, the sub-pixels generating the virtual pixels are surrounded by the sub-pixels generating the real pixels in  FIG. 19 . 
         [0051]    Please refer to  FIG. 20 , which is a schematic diagram of a circuit layout of the display device  190  shown in  FIG. 19 . The display device  190  is similar to the display device  90  shown in  FIG. 13 , thus the components with the similar functions use the same symbols. As shown in  FIG. 20 , the display device  190  comprises a driving module DRI and a plurality of sub-pixel groups SPG 5 . 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. 20  only shows the data line DLn-DLn+9, scan lines SLm-SLm+4 and parts of the plurality of sub-pixel groups SPG 5  for illustrations. In the sub-pixel group SPG 5  at the upper left corner, the sub-pixel SP 17  is coupled to the data line DLn and the scan line SLm; the sub-pixel SP 18  is coupled to the data line DLn+1 and the scan line SLm; the sub-pixel SP 19  is coupled to the data line DLn+2 and the scan line SLm+1; the sub-pixel SP 20  is coupled to the data line DLn+3 and the scan line SLm; the sub-pixel SP 21  is coupled to the data line DLn+4 and the scan line SLm; the sub-pixel SP 22  is coupled to the data line DLn+5 and the scan line SLm; and the sub-pixel SP 23  is coupled to the data line DLn+6 and the scan line SLm. The relationships between the data lines DLn-DLn+9, the scan lines SLm-SLm+4 and the rest of the sub-pixel groups SPG 5  in  FIG. 20  can be acquired by analogy. In the sub-pixel group SPG 5 , the sub-pixels SP 17 , SP 18 , SP 21 -SP 23  are coupled to the same scan line and the sub-pixel SP 19  is coupled to another adjacent scan line. As a result, the circuit layout of the display device  190  realized by repeatedly arranging the sub-pixel group SPG 5  can be optimized. 
         [0052]    According to different applications and design concepts, those with ordinary skill in the art may observe appropriate alternations and modifications. For example, the sub-pixel groups located at the adjacent rows in the display device may have different color arrangements. Please refer to  FIG. 3  and  FIG. 21 , wherein  FIG. 21  is a schematic diagram of another implementation of the display device  80  shown in  FIG. 8 . Different from  FIG. 8 , the sub-pixel groups SPG 1  located at the adjacent rows equip different color arrangements in  FIG. 21 . As shown in  FIG. 21 , the sub-pixels SP 1 -SP 4  in the sub-pixel groups SPG 1  located at the i row and the i+1 row are corresponding to blue, white, red and green; and the sub-pixels SP 1 -SP 4  in the sub-pixel groups SPG 1  located at the i+2 row and the i+3 row are corresponding to white, blue, red and green. 
         [0053]    Please refer to  FIG. 16  and  FIGS. 22A-22C , wherein  FIGS. 22A-22C  are schematic diagrams of other implementations of the display device  190  shown in  FIG. 19 . Different from  FIG. 19 , the sub-pixel groups SPG 5  of different rows in  FIGS. 22A-22C  have different color arrangements. As shown in  FIG. 22A , the sub-pixels SP 17 -SP 23  of the sub-pixel groups SPG 5  located at the i row and the i+1 row are corresponding to blue, red, green, blue, greed, red and green; and the sub-pixels SP 17 -SP 23  of the sub-pixel groups SPG 5  located at the i+2 row and the i+3 row are corresponding to red, blue, green, red, green, blue, and green. In  FIG. 22B , the sub-pixels SP 17 -SP 23  of the sub-pixel groups SPG 5  located at the i row and the i+1 row are corresponding to blue, red, white, blue, greed, red and green; and the sub-pixels SP 17 -SP 23  of the sub-pixel groups SPG 5  located at the i+2 row and the i+3 row are corresponding to red, blue, white, red, green, blue, and green. In  FIG. 22C , the sub-pixels SP 17 -SP 23  of the sub-pixel groups SPG 5  located at the i row and the i+1 row are corresponding to blue, red, green, blue, greed, red and green; and the sub-pixels SP 17 -SP 23  of the sub-pixel groups SPG 5  located at the i+2 row and the i+3 row are corresponding to blue, green, red, blue, green, red, and green. 
         [0054]    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. 
         [0055]    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.