Liquid crystal display device and method for manufacturing the same

• US 9,759,940 B2
• Filed: 12/20/2012
• Issued: 09/12/2017
• 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): BOYD, JONATHAN A
• Application Number:
  US13/722,366
• Publication Number:
  US 20130162570A1
• Time in Patent Office: 1,727 Days
• Field of Search: 345 87, 345173
• 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 display device including an active area, the display device comprising:

a first substrate;

a plurality of first pixel electrodes in the active area;

a plurality of second pixel electrodes in the active area;

a first common electrode block corresponding to the plurality of first pixel electrodes;

a second common electrode block corresponding to the plurality of second pixel electrodes;

a first sensing line connected with the first common electrode block in the active area; and

a second sensing line connected with the second common electrode block in the active area,

wherein the first sensing line is overlapped with a first portion of the first common electrode block, and the second sensing line is overlapped with a second portion of the first common electrode block and a second portion of the second common electrode block,

wherein the first sensing line is not connected with the second common electrode block in the active area and the second sensing line is not connected with the first common electrode block in the active area.

2. The display device of claim 1, further comprising a first electrode element and a second electrode element,

wherein the first sensing line is connected with the first common electrode block via the first electrode element,

wherein the second sensing line is connected with the second common electrode block via the second electrode element.

3. The display device of claim 2, wherein the first electrode element and the second electrode element are formed of a transparent conductive material that is same as a material of one of the plurality of first pixel electrodes or one of the plurality of second pixel electrodes.

4. The display device of claim 2, wherein the first sensing line is disposed on the first electrode element in a same layer as the plurality of first pixel electrodes, the first sensing line in contact with the first electrode element.

5. The display device of claim 1, wherein the first sensing line is overlapped with a portion of a first contact hole, and the second sensing line is overlapped with a portion of a second contact hole,

wherein the first sensing line is not overlapped with the second contact hole, and the second sensing line is not overlapped with the first contact hole.

6. The display device of claim 5, wherein the first sensing line is connected with the first common electrode block via the first contact hole, and the second sensing line is connected with the second common electrode block via the second contact hole.

7. The display device of claim 5, wherein the first contact hole and the second contact hole are in a non-transmission area.

8. The display device of claim 1, further comprising a second substrate and a high-resistance conductive layer on a first surface of the second substrate.

9. The display device of claim 1, wherein a non-common electrode area between the first common electrode block and the second common electrode block has no other common electrode block.

10. The display device of claim 1, wherein the first sensing line overlaps with one or more data lines or one or more gate lines and wherein the second sensing line is overlapped with one or more data lines or one or more gate lines.

11. The display device of claim 1, wherein the first sensing line and the second sensing line are in another layer different from a layer in which the first common electrode block and the second common electrode block are disposed.

12. The display device of claim 1, wherein the first sensing line is disposed away from one of the plurality of first pixel electrodes as a first distance, and the second sensing line is disposed away from one of the plurality of second pixel electrodes as a second distance.

13. The display device of claim 1, wherein the second sensing line is not overlapped with the plurality of first pixel electrodes and the plurality of second pixel electrodes disposed in a transmission area.

14. The display device of claim 1, wherein the first sensing line is overlapped with a first portion of the second common electrode block.

15. The display device of claim 1, wherein the first sensing line and second sensing line are oriented in a same direction as data lines or gate lines.

16. The display device of claim 1, further comprising a sensing circuit electrically coupled to the first sensing line and the second sensing line.

17. The display device of claim 16, wherein the sensing circuit is provided inside a drive IC.

18. The display device of claim 1, wherein an electrical signal is applied to the first common electrode block via the first sensing line and to the second common electrode block via the second sensing line.

19. The display device of claim 1, wherein a touch of the first common electrode block is sensed via the first sensing line and a touch of the second common electrode block is sensed via the second sensing line.

20. The display device of claim 1, wherein the first common electrode block and the second common electrode block operate as a touch sensing electrode for sensing a touch and a common electrode for displaying images.

21. A display device including an active area, the display device comprising:

a first substrate;

a plurality of first pixel electrodes in the active area;

a plurality of second pixel electrodes in the active area;

a first touch sensing electrode corresponding to the plurality of first pixel electrodes;

a second touch sensing electrode corresponding to the plurality of second pixel electrodes;

a first sensing line connected with the first touch sensing electrode in the active area; and

a second sensing line connected with the second touch sensing electrode in the active area,

wherein the first sensing line is overlapped with a first portion of the first touch sensing electrode, and the second sensing line is overlapped with a second portion of the first touch sensing electrode and a second portion of the second touch sensing electrode,

wherein the first sensing line is not connected with the second touch sensing electrode in the active area and the second sensing line is not connected with the first touch sensing electrode in the active area.

22. A sensing circuit for a display device including an active area, the display device comprising:

a first substrate;

a plurality of first pixel electrodes in the active area;

a plurality of second pixel electrodes in the active area;

a first common electrode block corresponding to the plurality of first pixel electrodes;

a second common electrode block corresponding to the plurality of second pixel electrodes;

a first sensing line connected with the first common electrode block in the active area; and

a second sensing line connected with the second common electrode block in the active area,

wherein the first sensing line is overlapped with a portion of the first common electrode block, and the second sensing line is overlapped with a portion of the first common electrode block and a portion of the second common electrode block,

wherein the first sensing line is not connected with the second common electrode block in the active area and the second sensing line is not connected with the first common electrode block in the active area,

wherein the sensing circuit comprising first circuitry configured to apply an electrical signal to the first common electrode block via the first sensing line and to the second common electrode block via the second sensing line,

wherein the first circuitry is electrically coupled to the first sensing line and the second sensing line.

23. The sensing circuit of claim 22, wherein the sensing circuit further comprising a first multiplexer, and the first circuitry is coupled to the first sensing line and the second sensing line via the first multiplexer.