Liquid crystal display having touch detecting structure

• US 20100053532A1
• Filed: 08/26/2008
• Published: 03/04/2010
• Est. Priority Date: 08/26/2008
• Status: Abandoned Application

• Current Assignee: CHI HSIN Electronics Corporation (InnoLux Corporation)
• Original Assignee: CHI HSIN Electronics Corporation (InnoLux Corporation)
• Inventors: Lai, Hui-Lung
• Application Number:
  US12/230,204
• Publication Number:
  US 20100053532A1
• Time in Patent Office: Days
• US Class Current: 349/151
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A liquid crystal display having a touch detecting structure includes an upper substrate, a lower substrate and a liquid crystal layer therebetween. A plurality of first electrodes, a plurality of second electrodes, and an insulating layer, which insulates the first and second electrodes, are provided between the liquid crystal layer and the lower substrate. The insulating layer is provided with a plurality of through holes associated with the first and second electrodes. An auxiliary pressing unit is between the upper substrate and the second electrodes, which includes a plurality of insulating protrusions above the through holes. When the liquid crystal display is pressed, the protrusion under the pressure will push the second electrode to have the second contact area contacting the first contact area that may increase the accuracy of touching.

Claims

1. A liquid crystal display having a touch detecting structure, comprising:

an upper substrate;

a lower substrate;

a liquid crystal layer between said upper substrate and said lower substrate;

a plurality of first electrodes between said lower substrate and said liquid crystal layer and substantially extended along a first direction, wherein some of said first electrodes have at least a first contact area respectively;

an insulating layer, which is provided between said first electrodes and said liquid crystal layer, having a plurality of through holes associated with said first contact areas of said first electrodes respectively; and

a plurality of second electrodes, which is provided between said insulating layer and said liquid crystal layer and along a second direction crossing said first direction, wherein each of said second electrodes has contact terminals associated with said through holes, and each of said contact terminals, which does not mask said entire through hole, has a second contact area keeping a predetermined distance from said corresponding first contact area of said first electrode.

2. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said second electrodes are provided on said insulating layer, and widths of said through holes of said insulating layer along said first direction are greater than that of said second contact areas of said second electrodes.

3. The liquid crystal display having the touch detecting structure as claimed in claim 2, wherein said contact terminals of said second electrodes are received in said through holes of said insulating layer respectively.

4. The liquid crystal display having the touch detecting structure as claimed in claim 2, wherein each of said second electrodes has a recess portion on said contact terminal associated with said through hole.

5. The liquid crystal display having the touch detecting structure as claimed in claim 4, wherein each of said second electrodes has a protrusion on a bottom side of said recess portion thereof.

6. The liquid crystal display having the touch detecting structure as claimed in claim 5, wherein each of said first electrodes has a protrusion on said first contact area associated with said protrusions of said second electrodes respectively.

7. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said second electrodes are provided on said insulating layer has a top side, and widths of said through holes of said insulating layer along said first direction are less than that of said second contact areas of said second electrodes along said first direction, and each of said second electrodes has at least a gap communicated with said through hole of said insulating layer.

8. The liquid crystal display having the touch detecting structure as claimed in claim 7, wherein each of said second electrodes has a recess portion on a side facing said through hole and said gap beside said recess portion.

9. The liquid crystal display having the touch detecting structure as claimed in claim 8, wherein each of said second electrodes has a protrusion on said first contact area associated with protrusions said first contact areas of said first electrodes respectively.

10. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said first direction is orthogonal to said second direction, and widths of said through holes of said insulating layer along said second direction are less than that of said first contact areas of said first electrodes along said second direction.

11. The liquid crystal display having the touch detecting structure as claimed in claim 10, all of said through holes of said insulating layer substantially have the same diameter.

12. The liquid crystal display having the touch detecting structure as claimed in claim 11, wherein said lower substrate has a first insulating layer having a first surface, on which said first electrodes are provided and projected thereform, and there is a gap between each of said long lateral sides of said first electrodes and a sidewall of each of said through holes of said insulating layer respectively.

13. The liquid crystal display having the touch detecting structure as claimed in claim 1, further comprising an auxiliary pressing unit including a plurality of insulating protrusions between said upper substrate and said second electrodes and above said through holes respectively.

14. The liquid crystal display having the touch detecting structure as claimed in claim 13, wherein said auxiliary pressing unit further includes a plurality of insulating ribs covering said second electrodes respectively, and said protrusions have a plurality of first protrusions connected to side insulating ribs and extended toward said upper substrate to enter said liquid crystal layer.

15. The liquid crystal display having the touch detecting structure as claimed in claim 14, wherein heights of said first protrusions are greater than a half of a thickness of said liquid crystal layer.

16. The liquid crystal display having the touch detecting structure as claimed in claim 14, further comprising a color filter layer, which has a black matrix, between said upper substrate and said liquid crystal layer, wherein said protrusions of said auxiliary pressing unit further include a plurality of second protrusions extended toward said first protrusion to enter said liquid crystal layer.

17. The liquid crystal display having the touch detecting structure as claimed in claim 16, wherein heights of said first protrusions and said second protrusions is greater than ⅓

of a thickness of said liquid crystal layer.

18. The liquid crystal display having the touch detecting structure as claimed in claim 13, further comprising a color filter layer, which has a black matrix, between said upper substrate and said liquid crystal layer, wherein said protrusions of said auxiliary pressing unit further include a plurality of second protrusions extended toward said lower substrate to enter said liquid crystal layer, and heights of said second protrusions are greater than a half of a thickness of said liquid crystal layer.

19. The liquid crystal display having the touch detecting structure as claimed in claim 13, further comprising a third insulating layer covering said second electrodes, wherein said protrusions of said auxiliary pressing unit are provided on said third insulating layer.

20. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said first electrodes are divided into several groups, in each of which a distance from the first to the last of said first electrodes is less than or identical to 0.7 cm.

21. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said second electrodes are divided into several groups, in each of which a distance from the first to the last of said second electrodes is less than or identical to 0.7 cm.

22. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein a distance between said neighboring first electrodes is less than or identical to 0.7 cm.

23. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein a distance between said neighboring second electrodes is less than or identical to 0.7 cm.

24. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said first electrodes are divided into several groups, in each of which said first electrodes are electrically connected together, and a distance from the first to the last of said first electrodes is less than or identical to 0.7 cm.

25. The liquid crystal display having the touch detecting structure as claimed in claim 1, wherein said second electrodes are divided into several groups, in each of which said second electrodes are electrically connected together, and a distance from the first to the last of said second electrodes is less than or identical to 0.7 cm.