Liquid crystal display device

Abstract

In spite of an increase in the size of a liquid crystal display panel, it is possible to prevent the defective connection of a flexible wiring board to a transparent substrate of the liquid crystal display panel. A liquid crystal display device includes a pair of transparent substrates arranged to oppose each other across a liquid crystal, for which they are utilized to form a chamber, a plurality of pixels formed along a spreading direction of the liquid crystal, driving circuits for supplying video signals to the pixels, and a flexible wiring board for supplying signals to the input sides of the driving circuits from a substrate on which a control circuit is mounted, the flexible wiring board being divided into a plurality of portions.

1. A liquid crystal display device, comprising:
 a liquid crystal display panel having, a pair of substrates arranged to oppose each other, a liquid crystal layer interposed between the pair of substrates, a plurality of pixels being formed along the liquid crystal layer;    a plurality of driving circuits for supplying signals to the pixels and being juxtaposed along one of edges of the liquid crystal display panel, the plurality of driving circuits being arranged adjacent one another and divided into a plurality of driving circuits groups having plural driving circuits along the one of the edges of the liquid crystal panel;    a printed circuit board having a control circuit mounted thereon which controls the plurality of driving circuits; and    a plurality of flexible wiring boards being juxtaposed along a direction in which the plurality of driving circuits are juxtaposed, a respective one of the plurality of flexible wiring boards being provided for a respective one of the plurality of driving circuits groups, each of the plurality of flexible wiring boards having a connecting portion to be connected to the printed circuit board and protruded portions provided in correspondence with respective driving circuits of a respective driving circuits group, the protruded portions being spaced from one another and protruding toward the one of the edges of the liquid crystal display panel and having respective ends mounted on one of the pair of substrates at the one of the edges of the liquid crystal display panel, wherein 
 each of the plurality of flexible wiring boards receives a control signal from the control circuit through the connecting portion thereof and inputs the control signal sequentially to respective input sides of the respective driving circuits of the respective one of the driving circuit groups corresponding thereto, and each of the protruded portions thereof having at least one signal path thereof inputting the control signal to the input side of the driving circuits of the respective one of the driving circuits groups.  
   
     
     
       2. A liquid crystal display device according to  claim 1 , wherein the plurality of driving circuits are ICs. 
     
     
       3. A liquid crystal display device according to  claim 1 , wherein the control signal is an enable signal sent from the control circuit to the plurality of driving circuits successively along the one of the edges of the liquid crystal panel through each of the plurality of flexible wiring boards and controls video signal acquisition by the respective driving circuits performed sequentially along the one of the edges of the liquid crystal panel. 
     
     
       4. A liquid crystal display device according to  claim 1 , wherein the printed circuit board is constructed to sequentially supply the control signal from said control circuit between said flexible wiring boards which are arranged adjacent to one another. 
     
     
       5. A liquid crystal display device according to  claim 1 , wherein a pair of the connecting terminals of a pair of the plurality of flexible wiring boards are arranged at respective sides of the pair of the plurality of flexible wiring boards which are adjacent to one another. 
     
     
       6. A liquid crystal display device according to  claim 5 , wherein the control circuit confronts a region between the pair of the connecting terminals of the pair of the plurality of flexible wiring boards. 
     
     
       7. A liquid crystal display device according to  claim 1 , wherein the control signal being supplied to the driving circuits corresponding to the one of the plurality of flexible wiring boards is a starting signal, and controls video signal acquisition of each of the driving circuits corresponding thereto sequentially along the one of the edges of the liquid crystal display panel as transferred between the respective driving circuits corresponding thereto. 
     
     
       8. A liquid crystal display device according to  claim 1 , wherein at least one of the plurality of flexible wiring boards has another connecting portion outputting the control signal outputted from one of the driving circuits corresponding thereto. 
     
     
       9. A liquid crystal display device according to  claim 1 , wherein each of the plurality of the pixels has a switching element, and the plurality of driving circuits are mounted on the one of the pair of substrates over which a plurality of video signal lines being connected to at least one of the switching elements are formed. 
     
     
       10. A liquid crystal display device according to  claim 9 , wherein the plurality of video signal lines are divided into groups in accordance with the driving circuits groups, and each of the groups includes a plurality of video signal lines adjacent to each other. 
     
     
       11. A liquid crystal display device, comprising:
 a liquid crystal display panel having, a pair of substrates arranged to oppose each other, a liquid crystal layer interposed between the pair of substrates, a plurality of pixels being formed along the liquid crystal layer;    a plurality of driving circuits for supplying signals to the pixels and being juxtaposed along one of edges of the liquid crystal display panel, the plurality of driving circuits being arranged adjacent one another and divided into a plurality of driving circuits groups having plural driving circuits along the one of the edges of the liquid crystal panel;    a printed circuit board having a control circuit mounted thereon which controls the plurality of driving circuits; and    a flexible wiring board, which is arranged to extend along a direction in which the plurality of driving circuits are juxtaposed, consisting of a plurality of sections thereof provided in correspondence with the driving circuits groups and arranged in an extension direction thereof, each of the sections having a connecting portion to be connected to the printed circuit board, and having protruded portions thereof protruded toward the one of the edges of the liquid crystal display panel in correspondence with the respective driving circuits belonging to the one of the driving circuit groups and having respective ends mounted on one of the pair of substrates at the one of the edges of the liquid crystal display panel, the protruded portions being spaced from each other at the ends thereof, wherein 
 a flexible wiring board receives a control signal from the control circuit through one of the connecting portions of the sections thereof,  
 each of the protruded portions corresponds to one of the driving circuits has at least one signal path for the control signal to be connected to an input side of the driving circuit corresponding thereto,  
 each region of the flexible wiring board between each pair of the sections which are adjacent to one another along the extension direction thereof is narrower than the rest thereof, and  
 the control signal is inputted to each of the plurality of driving circuits sequentially along the one of the edges of the liquid crystal display panel and is transferred through each region between the sections of the flexible wiring board.  
   
     
     
       12. A liquid crystal display device according to  claim 11 , wherein the flexible wiring board has multi-layered regions in the respective section thereof where a plurality of the conductive layers are stacked on each other, and the protruded portions and the each region between the sections are thinner than the multi-layered regions. 
     
     
       13. A liquid crystal display device according to  claim 1 , wherein the flexible wiring board has a multi-layered region where a plurality of the conductive layers being stacked on each other, and the protruded portions thereof are thinner than the multi-layered regions. 
     
     
       14. A liquid crystal display device according to  claim 1 , wherein the plurality of flexible wiring boards consists of a pair of flexible wiring boards extended and juxtaposed along the one of the edges of the liquid crystal display panel. 
     
     
       15. A liquid crystal display device according to  claim 11 , wherein the flexible wiring board comprises a plurality of flexible wiring boards juxtaposed along the one of the edges of the liquid crystal display panel for the respective section thereof, and a pair of the plurality of flexible wiring boards adjacent to one another are connected by a joint member provided at the region therebetween. 
     
     
       16. A liquid crystal display device according to  claim 11 , wherein the plurality of driving circuits are divided into a pair of driving circuits groups each including a plurality of driving circuits adjacent to each other along the one of the edges of the liquid crystal display panel, and the flexible wiring board consists of a pair of the sections thereof provided in correspondence with the pair of driving circuits groups, respectively. 
     
     
       17. A display device comprising:
   a first substrate comprising video signal lines for supplying a video signal to pixels, and scanning signal lines for supplying a scanning signal to the pixels;        a first board comprising a control circuit;        a plurality of driving circuits comprising a plurality of first driving circuits and a plurality of second driving circuits, each of the first and second driving circuit supplying the video signal to the video signal lines;        a second board for supplying an output from the control circuit to the plurality of first driving circuits, the second board being arranged between the first substrate and the first board;        a third board for supplying an output from the control circuit to the plurality of second driving circuits, the third board being arranged between the first substrate and the first board;        each pixel comprising:      a pixel electrode; and        a thin film transistor for controlling application of the video signal to the pixel electrode by the scanning signal;          wherein the output from the control circuit is supplied from a first area on the first board to a third area on the second board;        wherein the output from the control circuit is supplied from a second area on the first board to a fourth area on the third board;        wherein the third area is arranged adjacent one side of the second board, and the one side of the second board is arranged adjacent to the third board;        wherein the fourth area is arranged adjacent one side of the third board, and the one side of the third board is arranged adjacent to the second board,        wherein the first area on the first board overlaps with the third area on the second board;        wherein the second area on the first board overlaps with the fourth area on the third board;        wherein the output from the control circuit to the plurality of the first driving circuits is supplied through the second board independently of the third board;        wherein the output from the control circuit to the plurality of the second driving circuits is supplied through the third board independently of the second board; and        wherein the control circuit is arranged to overlap with the first area and the second area on the first board.     
     
     
       18. A display device according to  claim 17 , wherein the first substrate has long sides and short sides, and the second board and the third board are arranged between one long side of the first substrate and the first board. 
     
     
       19. A display device according to  claim 17 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich a liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate. 
     
     
       20. A display device according to  claim 18 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on the inside of the second substrate. 
     
     
       21. A display device comprising:
   a first substrate comprising a video signal lines for supplying a video signal for pixels, and a scanning signal lines for supplying a scanning signal for pixels;        a first board comprising a control circuit;        a plurality of driving circuits comprising a plurality of left driving circuits and a plurality of right driving circuits, each of left and right driving circuits being arranged horizontally, each of the left and right the driving circuits supplying the video signal to the video signal lines;        a second board for supplying an output from the control circuit to the plurality of left driving circuits, the second board being arranged between the first substrate and the first board;        a third board for supplying an output from the control circuit to the plurality of right driving circuits, the third board being arranged between the first substrate and the first board;        each pixel comprising:      a pixel electrode; and        a thin film transistor for controlling application of the video signal to the pixel electrode by the scanning signal;          wherein the output from the control circuit is supplied from a first area on the first board to a third area on the second board;        wherein the output from the control circuit is supplied from a second area on the first board to a fourth area on the third board;        wherein the third area is arranged adjacent one side of the second board, and the one side of the second board is arranged adjacent to the third board;        wherein the fourth area is arranged adjacent one side of the third board, and the one side of the third board is arranged adjacent to the second board;        wherein the first area on the first board overlaps with the third area on the second board;        wherein the second area on the first board overlaps with to the fourth area on the third board;        wherein the output from the control circuit to the plurality of left driving circuits is supplied through the second board independently of the third board;        wherein the output from the control circuit to the plurality of right driving circuits is supplied through the third board independent of the second board; and        wherein the control circuit is arranged to overlap with the first area and the second area on the first board.     
     
     
       22. A display device according to  claim 21 , wherein the first substrate has long sides and short sides, and the second board and the third board are arranged between one long side of the first substrate and the first board. 
     
     
       23. A display device according to  claim 21 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate. 
     
     
       24. A display device according to  claim 22 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate. 
     
     
       25. A display device comprising:
   a first substrate comprising video signal lines for supplying a video signal for pixels, and scanning signal lines for supplying a scanning signal for pixels;        a first board comprising a control circuit;        a plurality of driving circuit comprising a plurality of first half driving circuits and a plurality of second half driving circuits, each of the first and second half driving circuits supplying the video signal to the video signal lines;        a second board for supplying an output from the control circuit to the plurality of first half driving circuits, the second board being arranged between the first substrate and the first board;        a third board for supplying an output from the control circuit to the plurality of second half driving circuits, the third board being arranged between the first substrate and the first board;        each the pixel comprising:      a pixel electrode; and        a thin film transistor for controlling application of the video signal to the pixel electrode by the scanning signal;          wherein the output from the control circuit is supplied from a first area on the first board to a third area on the second board;        wherein the output from the control circuit is supplied from a second area on the first board to a fourth area on the third board;        wherein the third area is arranged adjacent one side of the second board, and the one side of the second board is arranged adjacent to the third board;        wherein the fourth area is arranged adjacent one side of the third board, and the one side of the third board is arranged adjacent to the second board;        wherein the first area on the first board overlaps with the third area on the second board;        wherein the second area on the first board overlaps with the fourth area on the third board;        wherein the output from the control circuit to the plurality of first half driving circuits is supplied through the second board independently of the third board;        wherein the output from the control circuit to the plurality of second half driving circuits is supplied through the third board independent of the second board; and        wherein the control circuit is arranged to overlap with the first area and the second area on the first board.     
     
     
       26. A display device according to  claim 25 , wherein the second board is arranged to a left of the third board, and each of the plurality of driving circuits is arranged horizontally, the plurality of first half driving circuits being arranged to a left side of the plurality of second half driving circuits. 
     
     
       27. A display device according to  claim 25 , wherein the first substrate has long sides and short sides, and the second board and the third board are arranged between one long side of the first substrate and the first board. 
     
     
       28. A display device according to  claim 26 , wherein the first substrate has long sides and short sides, the long sides being arranged horizontally and the second board and the third board is arranged between one long side of the first substrate and the first board. 
     
     
       29. A display device according to  claim 25 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate. 
     
     
       30. A display device according to  claim 26 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate. 
     
     
       31. A display device according to  claim 27 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate. 
     
     
       32. A display device according to  claim 28 , further comprising a second substrate, wherein the second substrate and the first substrate sandwich the liquid crystal layer, and a transparent electrode is arranged on an inside of the second substrate.