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

Patent metadata

Field	Value
Publication number	US-9727158-B2
Application number	US-201615287426-A
Country	US
Kind code	B2
Filing date	Oct 6, 2016
Priority date	Mar 19, 2010
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

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.

First claim

What is claimed is:

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

Assignees

• Lg Display Co Ltd

Inventors

• Oh Kum-Mi
• Kim Jin-Wuk
• Kim Sung-Hee

Classifications

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/044

  by capacitive means · CPC title

• G02F1/136204

  Arrangements to prevent high voltage or static electricity failures · CPC title

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title