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 an interconnecting layer and 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 , the connecting portion comprising a flexible wiring board, each of the plurality of wiring boards having 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  comprising a flexible wiring board, wherein 
 each of the plurality of flexible  wiring boards receives a control signal from the control circuit through the interconnecting layer of the printed circuit board and 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 an interconnecting layer and 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, and each of the connecting portion and the protruded portions comprising a flexible wiring board, wherein 
 a flexible  wiring board receives a control signal from the control circuit through the interconnecting layer of the printed circuit board and 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  inputted 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 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 an interconnecting layer and a control circuit mounted thereon which controls the plurality of driving circuits; and        a plurality of wiring boards being juxtaposed along a direction in which the plurality of driving circuits are juxtaposed, a respective one of the plurality of wiring boards being provided for a respective one of the plurality of driving circuits groups, each of the plurality of 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 protruding toward the one of the edges of the liquid crystal display panel;        wherein at least one of the connecting portion and the protruded portions of each of the plurality of wiring boards is flexible in relation to at least one other portion of the plurality of wiring boards; and        wherein each of the plurality of wiring boards receives a control signal from the control circuit through the interconnecting layer of the printed circuit board and 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.     
     
     
       18. A liquid crystal display device according to  claim 17 , wherein each of the plurality of wiring boards is formed of a multi- layered structure and the at least one of the connecting portion and the protruded portions is formed with a smaller number of layers than the at least one other portion of the plurality of wiring boards.   
     
     
       19. A liquid crystal display device according to  claim 17 , wherein at least the protruded portions of the plurality of wiring boards is flexible in relation to at least one other portion of the plurality of wiring boards. 
     
     
       20. A liquid crystal display device according to  claim 17 , wherein each of the plurality of wiring boards is formed of a multi- layered structure and at least the protruded portions is formed with a smaller number of layers than the at least one other portion of the plurality of wiring boards.   
     
     
       21. 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 an interconnecting layer and a control circuit mounted thereon which controls the plurality of driving circuits; and        a plurality of wiring boards being juxtaposed along a direction in which the plurality of driving circuits are juxtaposed, a respective one of the plurality of wiring boards being provided for a respective one of the plurality of driving circuits groups, each of the plurality of wiring boards having a connecting portion to be connected to the printed circuit board, the respective connecting portions being arranged adjacently to each other along the longitudinal direction of the wiring boards thereof, each of the plurality of wiring boards having 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,        wherein each of the plurality of wiring boards receives a control signal from the control circuit through the interconnecting layer of the printed circuit board and 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.     
     
     
       22. A liquid crystal display device according to  claim 21 , wherein the plurality of driving circuits are ICs. 
     
     
       23. A liquid crystal display device according to  claim 21 , 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 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. 
     
     
       24. A liquid crystal display device according to  claim 21 , wherein the printed circuit board is constructed to sequentially supply the control signal from said control circuit between said wiring boards which are arranged adjacent to one another. 
     
     
       25. A liquid crystal display device according to  claim 21 , wherein a pair of the connecting terminals of a pair of the plurality of wiring boards are arranged at respective sides of the pair of the plurality of wiring boards which are adjacent to one another. 
     
     
       26. A liquid crystal display device according to  claim 25 , wherein the control circuit confronts a region between the pair of the connecting terminals of the pair of the plurality of wiring boards. 
     
     
       27. A liquid crystal display device according to  claim 21 , wherein the control signal being supplied to the driving circuits corresponding to the one of the plurality of 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. 
     
     
       28. A liquid crystal display device according to  claim 21 , wherein at least one of the plurality of wiring boards has another connecting portion outputting the control signal outputted from one of the driving circuits corresponding thereto. 
     
     
       29. A liquid crystal display device according to  claim 21 , 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. 
     
     
       30. A liquid crystal display device according to  claim 29 , 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. 
     
     
       31. A liquid crystal display device according to  claim 21 , wherein the wiring board has a multi- layered region wherein a plurality of the conductive layers being stacked on each other, and the protruded portions thereof are thinner than the multi - layered regions.   
     
     
       32. A liquid crystal display device according to  claim 21 , wherein the plurality of wiring boards consists of a pair of wiring boards extended and juxtaposed along the one of the edges of the liquid crystal display panel.