Liquid crystal display device and method for manufacturing the same

• US 9,977,274 B2
• Filed: 05/16/2016
• Issued: 05/22/2018
• Est. Priority Date: 12/22/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Shin, Heesun, Lee, Seok Woo, Yu, Jae Sung, Kim, Ju Han, Lee, Sun Jung, Song, In Hyuk
• Primary Examiner(s): Briggs, Nathanael R
• Application Number:
  US15/156,243
• Publication Number:
  US 20160259195A1
• Time in Patent Office: 736 Days
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• 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 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• 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: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

Disclosed is an LCD device which realizes decreased thickness, simplified process, and decreased cost by using a common electrode for formation of electric field to drive liquid crystal as a sensing electrode, and removing a touch screen from an upper surface of the liquid crystal panel, the LCD device comprising gate and data lines crossing each other to define plural pixels on a lower substrate; a pixel electrode in each of the plural pixels; plural common electrode blocks patterned at the different layer from the pixel electrode, wherein the common electrode blocks, together with the pixel electrode, forms an electric field, and senses a user'"'"'s touch; and plural sensing lines electrically connected with the common electrode blocks, wherein, if the sensing line is electrically connected with one of the common electrode blocks, the sensing line is insulated from the remaining common electrode blocks.

Claims

1. A liquid crystal display device with an integrated touch screen, comprising:

a substrate;

a pixel electrode on the substrate;

an insulating layer on the pixel electrode;

a common electrode block on the insulating layer;

a sensing line electrically connected with the common electrode block; and

a sensing circuit electrically connected with the sensing line,

wherein an electrical signal is applied to the common electrode block via the sensing line, and a touch signal is transmitted to the sensing circuit for sensing a touch position from the common electrode block via the sensing line.

2. The liquid crystal display device with an integrated touch screen of claim 1, further comprising a gate line, a data line, and a pixel at a crossing of the gate line and the data line.

3. The liquid crystal display device with an integrated touch screen of claim 1, wherein the electrical signal is for sensing the touch position.

4. The liquid crystal display device with an integrated touch screen of claim 1, wherein the common electrode block forms an electric field with the pixel electrode for image display, and is a touch electrode for sensing the touch position.

5. The liquid crystal display device with an integrated touch screen of claim 1, further comprising other common electrode blocks, wherein the sensing line is insulated from the other common electrode blocks.

6. The liquid crystal display device with an integrated touch screen of claim 1, further comprising a gate line and a data line, wherein the sensing line extends in a same direction as the gate line or the data line.

7. The liquid crystal display device with an integrated touch screen of claim 1, further comprising a gate line and a data line, wherein the sensing line overlaps with a part of the gate line or a part of the data line.

25. The liquid crystal display device of claim 1, wherein the insulating layer is on the sensing line, and the common electrode block is electrically connected to the sensing line via a contact hole through the insulating layer.

26. The liquid crystal display device of claim 25, further comprising a plurality of other common electrode blocks on the insulating layer in a same row or column as the common electrode block,

wherein the other common electrode blocks in the same row or column as the common electrode block overlap with the sensing line and are insulated from the sensing line.

27. The liquid crystal display device of claim 25, wherein the pixel electrode and the sensing line are directly on a same underlying layer.

8. A liquid crystal display device with an integrated touch screen, comprising:

a substrate;

a common electrode block on the substrate;

an insulating layer on the common electrode block;

a pixel electrode on the insulating layer;

a sensing line electrically connected with the common electrode block; and

a sensing circuit electrically connected with the sensing line,

wherein an electrical signal is applied to the common electrode block via the sensing line, and the sensing circuit receives a touch signal for sensing a touch position from the common electrode block via the sensing line.

9. The liquid crystal display device with an integrated touch screen of claim 8, further comprising a gate line, a data line, and a pixel at a crossing of the gate line and the data line.

10. The liquid crystal display device with an integrated touch screen of claim 8, wherein the electrical signal is for sensing the touch position.

11. The liquid crystal display device with an integrated touch screen of claim 8, wherein the common electrode block forms an electric field with the pixel electrode for image display, and is a touch electrode for sensing the touch position.

12. The liquid crystal display device with an integrated touch screen of claim 8, further comprising other common electrode blocks, wherein the sensing line is insulated from the other common electrode blocks.

13. The liquid crystal display device with an integrated touch screen of claim 8, further comprising a gate line and a data line, wherein the sensing line extends in a same direction as the gate line or the data line.

14. The liquid crystal display device with an integrated touch screen of claim 8, further comprising a gate line and a data line, wherein the sensing line overlaps with a part of the gate line or a part of the data line.

28. The liquid crystal display device of claim 8, wherein the sensing line is on the insulating layer and is electrically connected with the common electrode block via a contact hole through the insulating layer.

29. The liquid crystal display device of claim 28, further comprising a plurality of other common electrode blocks in a same row or column as the common electrode block,

wherein the sensing line overlaps with and is insulated from the other common electrode blocks in the same row or column as the common electrode block.

30. The liquid crystal display device of claim 28, wherein the pixel electrode and the sensing line are directly on a same underlying layer.

15. A liquid crystal display device with an integrated touch screen, comprising:

a first electrode;

a second electrode insulated from the first electrode;

a sensing line electrically connected with the second electrode; and

a sensing circuit electrically connected with the sensing line,

wherein an electrical signal is applied to the second electrode via the sensing line, and the sensing circuit receives a touch signal for sensing a touch position from the second electrode via the sensing line.

16. The liquid crystal display device with an integrated touch screen of claim 15, further comprising a gate line, a data line, and a pixel at a crossing of the gate line and the data line.

17. The liquid crystal display device with an integrated touch screen of claim 15, wherein the electrical signal is for sensing a touch position.

18. The liquid crystal display device with an integrated touch screen of claim 15, wherein the second electrode forms an electric field with the first electrode for image display, and is a touch electrode for sensing the touch position.

19. The liquid crystal display device with an integrated touch screen of claim 15, further comprising another second electrode, wherein the sensing line is insulated from the another second electrode.

20. The liquid crystal display device with an integrated touch screen of claim 15, further comprising a gate line and a data line, wherein the sensing line extends in a same direction as the gate line or the data line.

21. The liquid crystal display device with an integrated touch screen of claim 15, further comprising a gate line and a data line, wherein the sensing line overlaps with a part of the gate line or a part of the data line.

22. The liquid crystal display device with an integrated touch screen of claim 15, wherein the first electrode is a pixel electrode and the second electrode is a common electrode block.

23. The liquid crystal display device with an integrated touch screen of claim 15, wherein both the first electrode and the second electrode are on a same substrate.

24. The liquid crystal display device with an integrated touch screen of claim 15, further comprising:

a first substrate;

a second substrate;

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

a color filter layer,

wherein both the first electrode and the second electrode are on the first substrate, and wherein the color filter layer is on the second substrate.

31. The liquid crystal display device of claim 15, further comprising an insulating layer between the sensing line and the second electrode,

wherein the sensing line is electrically connected with the second electrode via a contact hole through the insulating layer.

32. The liquid crystal display device of claim 31, further comprising a plurality of other second electrodes in a same row or column as the second electrode,

wherein the sensing line overlaps with and is insulated from the other second electrodes in the same row or column as the second electrode.

33. The liquid crystal display device of claim 31, wherein the first electrode and the sensing line are directly on a same underlying layer.