Patent Publication Number: US-8982031-B2

Title: Display panel having a plurality of multiplexers for driving a plurality of first driving switches and a plurality of second driving switches

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a display panel, and more particularly, to a source driving structure of a display panel. 
     2. Description of the Prior Art 
     Please refer to  FIG. 1 .  FIG. 1  is a diagram showing a display panel  100  of the prior art. The display panel  100  is divided into a plurality of display blocks  110  and  120 . The display blocks  110  and  120  are respectively controlled by the multiplexers  130  and  140 . The multiplexers  130  and  140  are electrically connected to a driving circuit  150  for receiving source driving signals of the driving circuit  150 . Driving switches  132 ,  142  of the multiplexers  130 ,  140  then transmit the source driving signals to pixels P turned on by the scan lines SL via the data lines DL, such that the pixels display images according to the source driving signals. As shown in  FIG. 1 , the multiplexer  140  is arranged at an upper side of the display panel  100  for transmitting source driving signals to pixels P at the right side of the display panel  100  via the data lines DL, and the multiplexer  130  is arranged at a lower side of the display panel  100  for transmitting source driving signals to pixels P at the left side of the display panel  100  via the data lines DL. 
     However, according to the above arrangement, the driving switches  132  of the multiplexer  130  are adjacent to each other as well as the driving switches  142  of the multiplexer  140 , such that horizontal spaces between the driving switches  132 ,  142  are limited, thus the driving switches  132 ,  142  of the multiplexer  130 ,  140  occupy more vertical space. Therefore, required widths of upper edge and lower edge of the display panel  100  need to be larger for the multiplexers  130 ,  140 . On the other hand, other spaces of the upper edge and lower edge without arranging the multiplexers  130 ,  140  are wasted. In addition, a signal line L 2  electrically connected to the multiplexer  130  is longer than a signal line L 1  electrically connected to the multiplexer  140 , such that loading of the pixels P at the right side is different from loading of the pixels P at the left side. Therefore, images displayed by the left side of the display panel  100  are not consistent with images displayed by the right side of the display panel  100 . 
     Moreover, the transistor made of indium gallium zinc oxide (IGZO) has an advantage for allowing electrons moving faster, such that the transistor has better current driving capability. Therefore, the transistor made of IGZO has advantages of fewer mask processes, lower cost than LTPS process, and better surface flatness on a TFT substrate. However, an electron moving speed of IGZO is slower than an electron moving speed of Low Temperature Poly-silicon (LTPS), such that when applying IGZO to design of the multiplexers, the multiplexers occupy more space; and when applying IGZO to a high resolution display device, there are more concerns for arrangement of space. 
     SUMMARY OF THE INVENTION 
     The present invention provides a display panel comprising a first multiplexer, a second multiplexer, a plurality of first data lines, a plurality of second data lines, a plurality of scan lines, and a plurality of pixels. The first multiplexer is arranged at a first side of the display panel, and the first multiplexer comprises a plurality of first driving switches. Each first driving switch comprises a first input end for receiving a first source driving signal, and a plurality of first output ends for outputting the first source driving signal. The second multiplexer is arranged at a second side of the display panel, and the second multiplexer comprises a plurality of second driving switches. Each second driving switch comprises a second input end for receiving a second source driving signal, and a plurality of second output ends for outputting the second source driving signal. The plurality of first data lines are electrically connected to the plurality of first output ends for transmitting the first source driving signal. The plurality of second data lines are electrically connected to the plurality of second output ends for transmitting the second source driving signal. The plurality of pixels are electrically connected to the plurality of first data lines, the plurality of second data lines and the plurality of scan lines for displaying images according to the first source driving signal and the second source driving signal. The plurality of first data lines and the plurality of second data lines are interlacedly arranged. 
     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 
         FIG. 1  is a diagram showing a display panel  100  of the prior art. 
         FIG. 2  is a diagram showing a display device of the present invention. 
         FIG. 3  is a diagram showing a first embodiment of a display panel of the display device of  FIG. 2 . 
         FIG. 4  is a diagram showing a first embodiment of driving switches of multiplexers of the present invention. 
         FIG. 5  is a diagram showing a second embodiment of the display panel of the present invention. 
         FIG. 6  is a diagram showing a third embodiment of the display panel of the present invention. 
         FIG. 7  is a diagram showing a fourth embodiment of the display panel of the present invention. 
         FIG. 8  is a diagram showing a fifth embodiment of the display panel of the present invention. 
         FIG. 9  is a diagram showing a sixth embodiment of the display panel of the present invention. 
         FIG. 10  is a diagram showing a second embodiment of driving switches of multiplexers of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Please refer to  FIG. 2  to  FIG. 4 .  FIG. 2  is a diagram showing a display device of the present invention.  FIG. 3  is a diagram showing a first embodiment of a display panel of the display device of  FIG. 2 .  FIG. 4  is a diagram showing a first embodiment of driving switches of multiplexers of the present invention. The display device  200  comprises a display panel  300  for displaying images, and a backlight module  210  for providing backlight. The display panel  300  comprises a first multiplexer  310 , a second multiplexer  320 , a driving circuit  350 , a plurality of first data lines DL 1 , a plurality of second data lines DL 2 , a plurality of scan lines SL, and a plurality pixels P. The first multiplexer  310  is arranged at a first side of the display panel  300 . The first multiplexer  310  comprises a plurality of first driving switches SW 1 , and each first driving switch SW 1  comprises a first input end IN 1 , a plurality of first control ends C 1 , and a plurality of first output ends OUT 1 . The first input end IN 1  is electrically connected to a first source driver  352  for receiving source driving signals generated by the first source driver  352 . The first control ends C 1  are electrically connected to the first source driver  352  for receiving first output control signals generated by the first source driver  352 . The first driving switch SW 1  selects the first output ends OUT 1  to output the source driving signal according to the first output control signal. The second multiplexer  320  is arranged at a second side of the display panel  300 . The second multiplexer  320  comprises a plurality of second driving switches SW 2 , and each second driving switch SW 2  comprises a second input end IN 1 , a plurality of second control ends C 2 , and a plurality of second output ends OUT 2 . The second input end IN 2  is electrically connected to a second source driver  354  for receiving source driving signals generated by the second source driver  354 . The second control ends C 2  are electrically connected to the second source driver  352  for receiving second output control signals generated by the second source driver  354 . The second driving switch SW 1  selects the second output ends OUT 2  to output the source driving signal according to the second output control signal. The first data line DL 1  is electrically connected to the first output end OUT 1  of the first driving switch SW 1  for transmitting the source driving signal outputted from the first driving switch SW 1  to the pixels P. The second data line DL 2  is electrically connected to the second output end OUT 2  of the second driving switch SW 2  for transmitting the source driving signal outputted from the second driving switch SW 2  to the pixels P. The pixels P are electrically connected to the first data lines DL 1 , the second data lines DL 2  and the scan lines SL. When a row of pixels P are turned on by a scan driver  356  of the driving circuit  350  via the scan line SL, the turned on pixels P display images according to the source driving signals. 
     As shown in  FIG. 3 , two first data lines DL 1  electrically connected to the first driving switch SW 1  are arranged at a side of two second data lines DL 2  electrically connected to the second driving switch SW 2 , and the first data lines DL 1  and the second data lines DL 2  are interlacedly arranged. In other words, the second driving switches SW 2  arranged at a lower side of the display panel  100  correspond to the first driving switches SW 1  arranged at an upper side of the display panel  100 , wherein the space arrangement is that one of the second driving switches SW 2  is arranged at a position corresponding to the middle of two adjacent first driving switches SW 1 . According to the above arrangement, horizontal spaces between the first driving switches SW 1  or the second driving switches SW 2  are larger (nearly double of the prior art), such that more horizontal space can be utilized for arranging the driving switches SW 1 , SW 2 , so as to further reduce required widths of the upper edge and lower edge of the display panel  300 . In addition, length of a signal line L 1  electrically connected between the first multiplexer  310  and the first source driver  352  is closer to length of a signal line L 2  electrically connected between the second multiplexer  320  and the second source driver  354 , such that loading of the pixels P controlled by the first multiplexer  310  is closer to loading of the pixels P controlled by the second multiplexer  320 . Therefore, the problem of inconsistence between images displayed at the left side and right side of the display panel can be solved. 
     Please refer to  FIG. 5 .  FIG. 5  is a diagram showing a second embodiment of the display panel of the present invention. As shown in  FIG. 5 , two first data lines DL 1  electrically connected to the first driving switch SW 1  are arranged between two second data lines DL 2  electrically connected to the second driving switch SW 2 , or two second data lines DL 2  electrically connected to the second driving switch SW 2  are arranged between two first data lines DL 1  electrically connected to the first driving switch SW 1 . 
     Please refer to  FIG. 6  and  FIG. 7 .  FIG. 6  is a diagram showing a third embodiment of the display panel of the present invention.  FIG. 7  is a diagram showing a fourth embodiment of the display panel of the present invention. The first data lines DL 1  electrically connected to the first driving switch SW 1  and the second data lines DL 2  electrically connected to the second driving switch SW 2  can be interlacedly arranged as shown in  FIG. 6  and  FIG. 7 . 
     Moreover, there can be more variations provided by mirroring the above arrangements of the first data lines DL 1  and the second data lines DL 2 . For example, please refer to  FIG. 8  and  FIG. 9 .  FIG. 8  is a diagram showing a fifth embodiment of the display panel of the present invention.  FIG. 9  is a diagram showing a sixth embodiment of the display panel of the present invention. The arrangement of the first data lines DL 1  and the second data lines DL 2  in  FIG. 8  is mirroring arrangement according to the arrangement of the first data lines DL 1  and the second data lines DL 2  in  FIG. 3 . In addition, the arrangement of the first data lines DL 1  and the second data lines DL 2  can be mirrored as shown in  FIG. 9 . The mirroring arrangement of the first data lines DL 1  and the second data lines DL 2  can further reduce mura effect caused by difference of loading. The arrangement of the first data lines DL 1  and the second data lines DL 2  of the present invention is not limited by the above embodiments. In other embodiments of the present invention, the first data lines DL 1  and the second data lines DL 2  can be arranged in other forms. 
     In the above embodiments, each of the driving switches comprises two output ends, however, in other embodiments, such as  FIG. 10 , each of the first and second driving switches comprises three or more than three output ends OUT 1 , OUT 2 . 
     In addition, the above driving circuit  350  of the display panel is an integrated driving circuit comprising the first multiplexer  352 , the second multiplexer  354  and the scan driver  356  for further saving space. However, in other embodiments, it is not necessary to integrate the source driver and the scan driver together. The source driver and the scan driver can independently exist. 
     In contrast to the prior art, the present invention provides the display panel and the source driving structure for reducing required widths of the upper edge and the lower edge of the display panel by arranging the first data lines and the second data lines interlacedly. Moreover, difference between the loading of the pixels controlled by the first multiplexer and the loading of the pixels controlled by the second multiplexer is reduced, so as to solve the problem of inconsistence between images displayed at the left side and right side of the display panel. 
     In addition, the circuit structure of the present invention comprising transistors made of indium gallium zinc oxide (IGZO) can reduce required widths of the upper edge and the lower edge of the display panel by arranging the first data lines and the second data lines interlacedly, such that the problem of occupying more space by utilizing IGZO can be effectively solved. 
     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.