Touch sensing type liquid crystal display device and method of fabricating the same

• US 9,201,259 B2
• Filed: 03/16/2011
• Issued: 12/01/2015
• Est. Priority Date: 03/19/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Sung-Hee, Kim, Jin-Wuk, Park, Joong-Pill
• Primary Examiner(s): Wood, Ellen S
• Assistant Examiner(s): Frost, Anthony J
• Application Number:
  US13/049,563
• Publication Number:
  US 20110228188A1
• Time in Patent Office: 1,721 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 2457/208 Touch screens
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels

Abstract

A touch sensing type liquid crystal display device includes an array substrate including a first substrate, a common electrode, a pixel electrode, and a touch sensing unit; a color filter substrate including a second substrate and facing the array substrate; an anti-static layer on an outer side of the second substrate and including a conductive polymer, a UV-setting binder and transparent silica and having a sheet resistance of several tens of Mega ohms per square (Ω/sq) to several Giga ohms per square (Ω/sq); and a liquid crystal layer between the first substrate and an inner side of the second substrate.

Claims

1. A capacitive touch sensing type liquid crystal display device, comprising:

an array substrate including a first substrate, a gate line, a data line, a common electrode, a pixel electrode, and a touch sensing unit including an X direction sensing line extending along a direction of the gate line and a Y direction sensing line extending along a direction of the data line;

a color filter substrate including a second substrate and facing the array substrate;

an anti-static layer on an outer side of the second substrate and including a conductive polymer, a UV-setting binder and transparent silica and having a sheet resistance of several tens of Mega ohms per square (Ω

/sq) to several Giga ohms per square (Ω

/sq); and

a liquid crystal layer between the first substrate and an inner side of the second substrate,

wherein the X direction sensing line overlaps the gate line, and the Y direction sensing line overlaps the data line, and the X direction sensing line and the Y direction sensing line are formed on the common electrode, and wherein the X direction sensing line and the Y direction sensing line are configured to sense a change of capacitance between the common electrode and an object touching the anti-static layer.

2. The device according to claim 1, wherein the conductive polymer includes one of polyaniline, poly(3,4-ethylenedioxythiophene) (PEDOT), polyacetylene, polypyrrole, polythiophene, and polysulfurnitride.

3. The device according to claim 1, wherein the UV-setting binder include one of acrylate, urethane acrylate oligomer, and acrylate monomer.

4. The device according to claim 1, wherein the transparent silica has a hydrophilic property.

5. The device according to claim 1, wherein a weight ratio of the conductive polymer to the UV-setting binder is about 0.5:

99.5 to about 10;

90, and a weight ratio of the transparent silica to the UV-setting binder is about 10;

90 to about 20;

80.

6. The device according to claim 1, wherein the anti-static layer further includes a multi-functional monomer of trimethylolpropane triacrylate (TMPTA).

7. The device according to claim 6, wherein a weight % of the multi-functional monomer is equal to or smaller than 5% with respect to the UV-setting binder.

8. The device according to claim 1, wherein the anti-static layer has a thickness of about 500 to about 5000 Å

.

9. The device according to claim 1, wherein the anti-static layer has a hardness being equal to or greater than 6H.

10. The device according to claim 1, wherein the touch sensing unit further includes:

an X direction sensing circuit at one end of the X direction sensing line; and

a Y direction sensing circuit at one end of the Y direction sensing line,

wherein a change of capacitance by a touch is detected by the X direction sensing circuit and the Y direction sensing circuit through the X direction sensing line and the Y direction sensing line, respectively.

11. The device according to claim 10, wherein a plurality of touch blocks are defined on the first substrate, and each touch block includes first to third regions, each of which includes at least one pixel region, and wherein the X direction sensing line is disposed at the first and third regions, and the Y direction sensing line is disposed at the second region.

12. The device according to claim 11, wherein the X direction sensing line in the first region is electrically connected to the X direction sensing line in the third region.

13. The device according to claim 12, wherein the touch sensing unit further includes a connection line in the second region for electrical connection of the X direction sensing line in the first region and the X direction sensing line in the third region.

14. The device according to claim 12, wherein the common electrode has an island shape in each of the first to third regions, and the X and Y direction sensing lines contacts the common electrode.

15. The device according to claim 1, wherein the array substrate further includes:

an interlayer insulating layer on the gate lines;

a thin film transistor in each pixel region and connected to the gate and data lines;

a first passivation layer on the data lines and the thin film transistor, wherein the common electrode is disposed on the first passivation layer and has an island shape in each of the first to third regions; and

a second passivation layer over the common electrode, wherein the first and second passivation layers have a drain contact hole exposing a portion of the thin film transistor,

wherein the pixel electrode is disposed on the second passivation layer and contacts the portion of the thin film transistor through the drain contact hole, and wherein the data line is disposed on the interlayer insulating layer and crosses the gate line to define a plurality of pixel regions, and a plurality of pixel regions from each of first to third regions.

16. The device according to claim 15, wherein the pixel electrode has at least one opening to generate a fringe field with the common electrode.

17. The device according to claim 15, wherein the color filter substrate further includes:

a black matrix corresponding to boundaries of each pixel region; and

a color filter layer corresponding to the each pixel region.

18. The device according to claim 15, wherein the touch sensing unit further includes:

a connection line in the second region under the interlayer insulating layer;

first and second connection patterns on the second passivation layer,

wherein the X direction sensing line is disposed on the common electrode in the first and third regions, and the Y direction sensing line is disposed on the common electrode in the second region,

wherein the second passivation layer has a first contact hole exposing an end of the X direction sensing line in the first region and a second contact hole exposing an end of the X direction sensing line in the third region, wherein the first and second passivation layers have a drain contact hole exposing a portion of the thin film transistor, and the first and second passivation layers and the interlayer insulating layer have third and fourth contact holes respectively exposing both ends of the connection line,

wherein one end of the first connection pattern contacts the X direction sensing line in the first region through the first contact hole, and the other end of the first connection pattern contacts one end of the connection line through the third contact hole, and

wherein one end of the second connection pattern contacts the X direction sensing line in the third region through the second contact hole, and the other end of the second connection pattern contacts the other end of the connection line through the fourth contact hole.

19. A capacitive touch sensing type liquid crystal display device, comprising:

an array substrate including a first substrate, a gate line, a data line, a common electrode, a pixel electrode, and a touch sensing unit including an X direction sensing line extending along a direction of the gate line and a Y direction sensing line extending along a direction of the data line;

a color filter substrate including a second substrate and facing the array substrate;

an anti-static layer on an outer side of the second substrate and including one of a conductive polymer or a conductive inorganic material and a thermo-setting binder and having a sheet resistance of several tens Mega ohms per square (a/sq) to several hundreds Mega ohms per square (Ω

/sq); and

a liquid crystal layer between the first substrate and an inner side of the second substrate,

wherein the X direction sensing line overlaps the gate line, and the Y direction sensing line overlaps the data line, and the X direction sensing line and the Y direction sensing line are formed on the common electrode, and wherein the X direction sensing line and the Y direction sensing line are configured to sense a change of capacitance between the common electrode and an object touching the anti-static layer.

20. The device according to claim 19, wherein the conductive polymer includes one of polyaniline, poly(3,4-ethylenedioxythiophene) (PEDOT), polyacetylene, polypyrrole, polythiophene, and polysulfurnitride.

21. The device according to claim 19, wherein the conductive inorganic material includes one of indium-tin-oxide (ITO), indium-zinc-oxide (IZO) and tin oxide (TiO2).

22. The device according to claim 19, wherein the thermo-setting binder includes one of tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) and is cured under a temperature below 100°

C.

23. The device according to claim 19, wherein a weight ratio of the one of the conductive polymer and the conductive inorganic material to the thermo-setting binder is about 0.5:

99.5 to about 10;

90.

24. The device according to claim 19, wherein the anti-static layer has a thickness of about 500 to about 5000 Å

.

25. The device according to claim 19, wherein the anti-static layer has a hardness of 7H to 9H.

26. The device according to claim 19, wherein the touch sensing unit further includes:

an X direction sensing circuit at one end of the X direction sensing line; and

a Y direction sensing circuit at one end of the Y direction sensing line,

wherein a change of capacitance by a touch is detected by the X direction sensing circuit and the Y direction sensing circuit through the X direction sensing line and the Y direction sensing line, respectively.

27. The device according to claim 26, wherein a plurality of touch blocks are defined on the first substrate, and each touch block includes first to third regions, each of which includes at least one pixel region, and wherein the X direction sensing line is disposed at the first and third regions, and the Y direction sensing line is disposed at the second region.

28. The device according to claim 27, wherein the X direction sensing line in the first region is electrically connected to the X direction sensing line in the third region.

29. The device according to claim 28, wherein the touch sensing unit further includes a connection line in the second region for electrical connection of the X direction sensing line in the first region and the X direction sensing line in the third region.

30. The device according to claim 28, wherein the common electrode has an island shape in each of the first to third regions, and the X and Y direction sensing lines contacts the common electrode.

31. The device according to claim 19, wherein the array substrate further includes:

an interlayer insulating layer on the gate line;

a thin film transistor in each pixel region and connected to the gate and data lines;

a first passivation layer on the data line and the thin film transistor, wherein the common electrode is disposed on the first passivation layer and has an island shape in each of the first to third regions; and

a second passivation layer over the common electrode, wherein the first and second passivation layers have a drain contact hole exposing a portion of the thin film transistor,

wherein the pixel electrode is disposed on the second passivation layer and contacts the portion of the thin film transistor through the drain contact hole, and wherein the data line is disposed on the interlayer insulating layer and crosses the gate line to define a plurality of pixel regions, and a plurality of pixel regions from each of the first to third regions.

32. The device according to claim 31, wherein the pixel electrode has at least one opening to generate a fringe field with the common electrode.

33. The device according to claim 31, wherein the color filter substrate further includes:

a black matrix corresponding to boundaries of each pixel region; and

a color filter layer corresponding to the each pixel region.

34. The device according to claim 31, wherein the touch sensing unit includes:

a connection line in the second region under the interlayer insulating layer;

first and second connection patterns on the second passivation layer,

wherein the X direction sensing line is disposed on the common electrode in the first and third regions, and the Y direction sensing line is disposed on the common electrode in the second region,

wherein the second passivation layer has a first contact hole exposing an end of the X direction sensing line in the first region and a second contact hole exposing an end of the X direction sensing line in the third region, wherein the first and second passivation layers have a drain contact hole exposing a portion of the thin film transistor, and the first and second passivation layers and the interlayer insulating layer have third and fourth contact holes respectively exposing both ends of the connection line,

wherein one end of the first connection pattern contacts the X direction sensing line in the first region through the first contact hole, and the other end of the first connection pattern contacts one end of the connection line through the third contact hole, and

wherein one end of the second connection pattern contacts the X direction sensing line in the third region through the second contact hole, and the other end of the second connection pattern contacts the other end of the connection line through the fourth contact hole.

35. A capacitive touch sensing type liquid crystal display device, comprising:

an array substrate including a first substrate, a gate lien, a data line, a common electrode, a pixel electrode, and a touch sensing unit including an X direction sensing line extending along a direction of the gate line and a Y direction sensing line extending along a direction of the data line;

a color filter substrate including a second substrate and facing the array substrate;

an anti-static layer on an outer side of the second substrate and including a conductive polymer, one of a UV-setting binder and a thermo-setting binder, and a stabilizer and having a sheet resistance of several tens Mega ohms per square (Ω

/sq) to several Giga ohms per square (Ω

/sq); and

a liquid crystal layer between the first substrate and an inner side of the second substrate,

wherein the X direction sensing line overlaps the gate line, and the Y direction sensing line overlaps the data line, and the X direction sensing line and the Y direction sensing line are formed on the common electrode, and wherein the X direction sensing line and the Y direction sensing line are configured to sense a change of capacitance between the common electrode and an object touching the anti-static layer.

36. The device according to claim 35, wherein the conductive polymer includes one of polyaniline, poly(3,4-ethylenedioxythiophene) (PEDOT), polyacetylene, polypyrrole, polythiophene, and polysulfurnitride, and the stabilizer includes one of 2,5-dihydro-1H-imidazole, 3,4-dihydroxyfuran-2(5H)-one, and 3,4,5-trihydroxybenzoic acid.

37. The device according to claim 35, wherein a range of the sheet resistance is maintained even when it is exposed to a temperature of 60°

C. to 100°

C., a humidity of 60 to 100% and a time above 200 hours.

38. The device according to claim 35, wherein the thermo-setting binder includes one of tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) and is cured under a temperature below 100 □

.

39. The device according to claim 35, wherein a weight ratio of each of the conductive polymer and the stabilizer to one of the UV-setting binder and the thermo-setting binder is about 0.5:

99.5 to about 10;

90.

40. The device according to claim 35, wherein the anti-static layer has a thickness of 500 to 5000 Å

.

41. The device according to claim 35, wherein the anti-static layer has a hardness of 7 to 9H.

42. The device according to claim 35, wherein the touch sensing unit further includes:

an X direction sensing circuit at one end of the X direction sensing line; and

a Y direction sensing circuit at one end of the Y direction sensing line,

wherein a change of capacitance by a touch is detected by the X direction sensing circuit and the Y direction sensing circuit through the X direction sensing line and the Y direction sensing line, respectively.

43. The device according to claim 42, wherein a plurality of touch blocks are defined on the first substrate, and each touch block includes first to third regions, each of which includes at least one pixel region, and wherein the X direction sensing line is disposed at the first and third regions, and the Y direction sensing line is disposed at the second region.

44. The device according to claim 43, wherein the X direction sensing line in the first region is electrically connected to the X direction sensing line in the third region.

45. The device according to claim 44, wherein the touch sensing unit further includes a connection line in the second region for electrical connection of the X direction sensing line in the first region and the X direction sensing line in the third region.

46. The device according to claim 44, wherein the common electrode has an island shape in each of the first to third regions, and the X and Y direction sensing lines contacts the common electrode.

47. The device according to claim 35, wherein the array substrate further includes:

an interlayer insulating layer on the gate line;

a thin film transistor in each pixel region and connected to the gate and data lines;

a first passivation layer on the data line and the thin film transistor, wherein the common electrode is disposed on the first passivation layer and has an island shape in each of the first to third regions; and

a second passivation layer over the common electrode, wherein the first and second passivation layers have a drain contact hole exposing a portion of the thin film transistor,

wherein the pixel electrode is disposed on the second passivation layer and contacts the portion of the thin film transistor through the drain contact hole, and wherein the data line is disposed on the interlayer insulating layer and corsses the gate line to define a plurality of pixel regions, and a plurality of pixel regions form each of first to third regions.

48. The device according to claim 47, wherein the pixel electrode has at least one opening to generate a fringe field with the common electrode.

49. The device according to claim 47, wherein the color filter substrate further includes:

a black matrix corresponding to boundaries of each pixel region; and

a color filter layer corresponding to the each pixel region.

50. The device according to claim 47, wherein the touch sensing unit further includes:

a connection line in the second region under the interlayer insulating layer;

first and second connection patterns on the second passivation layer,

wherein the X direction sensing line is disposed on the common electrode in the first and third regions, and the Y direction sensing line is disposed on the common electrode in the second region,

wherein the second passivation layer has a first contact hole exposing an end of the X direction sensing line in the first region and a second contact hole exposing an end of the X direction sensing line in the third region, wherein the first and second passivation layers have a drain contact hole exposing a portion of the thin film transistor, and the first and second passivation layers and the interlayer insulating layer have third and fourth contact holes respectively exposing both ends of the connection line,

wherein one end of the first connection pattern contacts the X direction sensing line in the first region through the first contact hole, and the other end of the first connection pattern contacts one end of the connection line through the third contact hole, and

wherein one end of the second connection pattern contacts the X direction sensing line in the third region through the second contact hole, and the other end of the second connection pattern contacts the other end of the connection line through the fourth contact hole.