Display device

• US 9,990,099 B2
• Filed: 12/28/2016
• Issued: 06/05/2018
• Est. Priority Date: 12/31/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Ham, Yong-Su, Kim, Taeheon, Lee, YongWoo, Kho, YuSeon, Lim, MyungJin, Choi, Seulgi
• Primary Examiner(s): Shah, Priyank
• Application Number:
  US15/392,465
• Publication Number:
  US 20170192560A1
• Time in Patent Office: 524 Days
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: H04M 1/0266 for a display module assembly

Abstract

Provided is a display device. The display device includes: a touch sensitive element including an electroactive layer and a plurality of electrodes disposed on at least one of the top surface and the bottom surface of the electroactive layer; a shielding layer on the touch sensitive element; a display panel on the shielding layer; and a touch sensor integrated in the display panel and including a plurality of first touch electrodes and a plurality of second touch electrodes spaced apart from the plurality of first touch electrodes, and the shielding layer is electrically connected with the plurality of first touch electrodes or the plurality of second touch electrodes.

Claims

1. A display device comprising:

a touch sensitive element including an electroactive layer and a plurality of electrodes disposed on at least one of a top surface and a bottom surface of the electroactive layer;

a shielding layer on the touch sensitive element;

a display panel on the shielding layer; and

a touch sensor integrated in the display panel and including a plurality of first touch electrodes and a plurality of second touch electrodes spaced apart from the plurality of first touch electrodes,

wherein the shielding layer is electrically connected with one of the plurality of first touch electrodes and the plurality of second touch electrodes.

2. The display device according to claim 1, wherein:

the plurality of first touch electrodes are driving electrodes,

the plurality of second touch electrodes are sensing electrodes, and

the shielding layer is electrically connected with the plurality of second touch electrodes.

3. The display device according to claim 2, further comprising:

a first flexible printed circuit board including a line disposed on the shielding layer and electrically connected with the shielding layer;

a second flexible printed circuit board including a line disposed on the display panel and electrically connected with the plurality of second touch electrodes; and

a first printed circuit board including a first line connected with the line of the first flexible printed circuit board and a second line electrically connected with the line of the second flexible printed circuit board,

wherein the shielding layer and the plurality of second touch electrodes are electrically connected to each other in the first printed circuit board through the first line and the second line.

4. The display device according to claim 3, further comprising:

a second printed circuit board on which a central processing unit (CPU) for driving the display device is mounted; and

a flexible cable electrically connecting the first printed circuit board and the second printed circuit board,

wherein the first printed circuit board further includes a connector into which the flexible cable is inserted, a touch integrated circuit (IC) electrically connected with the second line and driving the touch sensor, and a third line electrically connected with the touch IC and transferring the same signal as the second line, and

the first line and the third line are electrically connected with a ground pin of the connector.

5. The display device according to claim 3, wherein the first flexible printed circuit board further includes a plurality of lines electrically connected with the plurality of first electrodes and the plurality of second electrodes of the touch sensitive element.

6. The display device according to claim 1, wherein the shielding layer includes a transparent conductive layer made of a transparent conductive material.

7. The display device according to claim 1, wherein the plurality of electrodes of the touch sensitive element includes a plurality of first electrodes disposed on the top surface of the electroactive layer and a plurality of second electrodes disposed on the bottom surface of the electroactive layer and crossing the plurality of the first electrodes.

8. The display device according to claim 7, wherein when a first voltage is applied to one of the plurality of first electrodes, one of the plurality of second electrodes is grounded and the remaining second electrodes are floating.

9. The display device according to claim 1, wherein the active electric layer is made of an electroactive polymer, and

the plurality of electrodes of the touch sensitive material are made of the transparent conductive material.

10. The display device according to claim 9, further comprising:

a backlight unit disposed under the touch sensitive element,

wherein the display panel is a liquid crystal display panel.

14. The display device according to claim 6, wherein the touch sensitive element is connected to the transparent conductive layer.

15. The display device according to claim 14, wherein the touch sensitive element and the transparent conductive layer comprise a same material.

18. The display device according to claim 1, wherein the thickness of the electroactive layer 133 is about 80 μ

m, the thicknesses of the first electrode and the second electrode are about 50 μ

m.

11. A display device comprising:

a display panel including a plurality of pixel electrodes and a plurality of common electrodes;

a touch sensitive element disposed under the display panel, and including an electroactive layer and a plurality of electrodes disposed on at least one of a top surface and a bottom surface of the electroactive layer; and

a shielding layer between the touch sensitive element and the display panel and including a transparent conductive layer,

wherein the plurality of common electrodes serve as touch sensitive electrodes, and

a number of the plurality of common electrodes have a same potential as the transparent conductive layer.

12. The display device according to claim 11, further comprising:

a first flexible printed circuit board contacting one surface of the shielding layer and electrically connected with the transparent conductive layer;

a second flexible printed circuit board contacting one surface of the display panel and electrically connected with the plurality of common electrodes; and

a first printed circuit board electrically connected with the first flexible printed circuit board and the second flexible printed circuit board,

wherein each of the transparent conductive layer and a number of the plurality of common electrodes is electrically connected to the same point of the first printed circuit board through the first flexible printed circuit board and the second flexible printed circuit board.

13. The display device according to claim 12, wherein the first printed circuit board includes a cable connection connector, and

the transparent conductive layer and a number of the plurality of common electrodes are electrically connected to a ground pin of the connector.

16. The display device according to claim 11, wherein the touch sensitive element is connected to the transparent conductive layer.

17. The display device according to claim 16, wherein the touch sensitive element and the transparent conductive layer comprise a same material.

19. The display device according to claim 11, wherein the thickness of the electroactive layer 133 is about 80 μ

m, the thicknesses of the first electrode and the second electrode are about 50 μ

m.