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

• US 9,727,158 B2
• Filed: 10/06/2016
• Issued: 08/08/2017
• Est. Priority Date: 03/19/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Oh, Kum-Mi, Kim, Jin-Wuk, Kim, Sung-Hee
• Primary Examiner(s): DUONG, THOI V
• Application Number:
  US15/287,426
• Publication Number:
  US 20170023835A1
• Time in Patent Office: 306 Days
• Field of Search: 345174, 345173, 345177, 345 92, 349 12, 349 43, 349138, 349139, 349 40, 349 54, 349 50, 349141, 349199, 178 1806, 178 1801, 178 1803, 178 1807, 178 1808, 977742, 977952
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136204 Arrangements to prevent high voltage or static electricity failures
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2202/22 Antistatic materials or arrangements
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52

Abstract

A touch sensing type liquid crystal display device includes an array substrate includes 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 an organic material and a carbon nano-tube; and a liquid crystal layer between the first substrate and an inner side of the second substrate.

Claims

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

first and second substrates facing each other;

a liquid crystal layer between the first and second substrates; and

an anti-static layer on an outer side of the second substrate and including a base material and a conductive material,

wherein the first substrate includes;

a plurality of first signal lines;

a plurality of second signal lines crossing the plurality of first signal lines;

a plurality of pixel electrodes;

a plurality of first common electrodes in a region; and

a sensing line electrically connected to the plurality of first common electrodes in the region and extending along at least one of the plurality of first signal lines; and

a sensing circuit electrically connected to the sensing line,

wherein the liquid crystal layer is driven by a fringe field between the plurality of pixel electrodes and the plurality of first common electrodes for displaying an image,

wherein the sensing circuit detects a change of capacitance between an object and the plurality of first common electrodes through the sensing line for sensing a touched position.

2. The touch sensing type liquid crystal display device according to claim 1, wherein the plurality of first common electrodes group into a first touch block defining a first unit region for touch sensing, and the first touch block overlaps with the sensing line.

3. The touch sensing type liquid crystal display device according to claim 2, further comprising a plurality of second common electrodes grouping into a second touch block defining a second unit region for the touch sensing.

4. The touch sensing type liquid crystal display device according to claim 3, wherein the first touch block is separated from the second touch block.

5. The touch sensing type liquid crystal display device according to claim 3, wherein the plurality of first common electrodes are separated from the plurality of second common electrodes.

6. The touch sensing type liquid crystal display device according to claim 2, wherein the first touch block includes a plurality of pixel regions.

7. The touch sensing type liquid crystal display device according to claim 1, wherein the anti-static layer serves as a conductive path for static electricity and serves as an insulating layer for sensing the touch position.

8. The touch sensing type liquid crystal display device according to claim 1, wherein a touch on the anti-static layer is detected by a capacitor, and the capacitor includes:

the object touching the anti-static layer as a first electrode;

a dielectric layer including the anti-static layer, the second substrate, and the liquid crystal layer; and

the first common electrode as a second electrode.

9. The touch sensing type liquid crystal display device according to claim 1, wherein the sensing line overlaps the plurality of second signal lines and is parallel to one of the first signal lines.

10. The touch sensing type liquid crystal display device according to claim 1, wherein the plurality of first common electrodes in the region extending along the at least one of the plurality of first signal lines are electrically connected by the sensing line.

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

first and second substrates facing each other;

a liquid crystal layer between the first and second substrates; and

an anti-static layer on an outer side of the second substrate, the anti-static layer including a conductive material,

wherein the first substrate includes;

a plurality of first signal lines;

a plurality of second signal lines crossing the plurality of first signal lines;

a plurality of pixel electrodes;

a plurality of first common electrodes in a region;

a sensing line electrically connected to the plurality of first common electrodes in the region and extending along at least one of the plurality of first signal lines; and

a sensing circuit electrically connected to the sensing line,

wherein the liquid crystal layer is driven by a fringe field between the plurality of pixel electrodes and the plurality of first common electrodes for displaying an image, and

wherein the sensing circuit detects a change of capacitance between an object and the plurality of first common electrodes through the sensing line for sensing a touched position.

12. The touch sensing type liquid crystal display device according to claim 11, wherein the plurality of first common electrodes group into a first touch block defining a first unit region for touch sensing, and the first touch block overlaps with the sensing line.

13. The touch sensing type liquid crystal display device according to claim 12, further comprising a plurality of second common electrodes grouping into a second touch block defining a second unit region for the touch sensing.

14. The touch sensing type liquid crystal display device according to claim 13, wherein the first touch block is separated from the second touch block.

15. The touch sensing type liquid crystal display device according to claim 13, wherein the plurality of first common electrodes are separated from the plurality of second common electrodes.

16. The touch sensing type liquid crystal display device according to claim 12, wherein the first touch block include a plurality of pixel regions.

17. The touch sensing type liquid crystal display device according to claim 12, wherein the plurality of first common electrodes in the region extending along the at least one of the plurality of first signal lines are electrically connected by the sensing line.

18. The touch sensing type liquid crystal display device according to claim 11, wherein the anti-static layer serves as a conductive path for a static electricity and serves as an insulating layer for sensing the touch position.

19. The touch sensing type liquid crystal display device according to claim 11, wherein a touch on the anti-static layer is detected by a capacitor, and the capacitor includes:

the object touching the anti-static layer as a first electrode;

a dielectric layer including the anti-static layer, the second substrate, and the liquid crystal layer; and

the first common electrode as a second electrode.

20. The touch sensing type liquid crystal display device according to claim 11, wherein the sensing line overlaps the plurality of second signal lines and is parallel to one of the first signal lines.

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

first and second substrates facing each other;

a liquid crystal layer between the first and second substrates; and

an anti-static layer on an outer side of the second substrate,

wherein the first substrate includes;

a plurality of first signal lines;

a plurality of second signal lines crossing the plurality of first signal lines;

a plurality of pixel electrodes;

a plurality of first common electrodes in a region;

a sensing line electrically connected to the plurality of first common electrodes in the region and extending along at least one of the plurality of first signal lines; and

a sensing circuit electrically connected to the sensing line;

wherein the liquid crystal layer is driven by a fringe field between the plurality of pixel electrodes and the plurality of first common electrodes for displaying an image,

wherein the sensing circuit detects a change of capacitance between an object and the plurality of first common electrodes through the sensing line for sensing a touched position, and

wherein the anti-static layer serves as a conductive path for static electricity and serves as an insulating layer for sensing the touch position.

22. The touch sensing type liquid crystal display device according to claim 21, wherein the plurality of first common electrodes group into a first touch block defining a first unit region for touch sensing, and the first touch block overlaps with the sensing line.

23. The touch sensing type liquid crystal display device according to claim 22, further comprising a plurality of second common electrodes grouping into a second touch block defining a second unit region for the touch sensing.

24. The touch sensing type liquid crystal display device according to claim 23, wherein the first touch block is separated from the second touch block.

25. The touch sensing type liquid crystal display device according to claim 23, wherein the plurality of first common electrodes are separated from the plurality of second common electrodes.

26. The touch sensing type liquid crystal display device according to claim 22, wherein the first touch block include a plurality of pixel regions.

27. The touch sensing type liquid crystal display device according to claim 21, wherein a touch on the anti-static layer is detected by a capacitor, and the capacitor includes:

the object touching the anti-static layer as a first electrode;

a dielectric layer including the anti-static layer, the second substrate, and the liquid crystal layer; and

the first common electrode as a second electrode.

28. The touch sensing type liquid crystal display device according to claim 21, wherein the sensing line overlaps the plurality of second signal lines and is parallel to one of the first signal lines.

29. The touch sensing type liquid crystal display device according to claim 21, wherein the plurality of first common electrodes in the region extending along the at least one of the plurality of first signal lines are electrically connected by the sensing line.