DISPLAY DEVICE AND METHOD OF DRIVING THE SAME

• US 20170192508A1
• Filed: 12/27/2016
• Published: 07/06/2017
• Est. Priority Date: 12/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LIM, MyungJin, KIM, CheolSe, HAM, Yong-Su, KIM, Taeheon, LEE, YongWoo, KHO, YuSeon, CHOI, Seulgi
• Granted Patent: US 10,488,927 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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

Abstract

Provided are a display device and a method of driving the same. The display device includes: a touch sensitive element having 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 display panel disposed under the touch sensitive element; and a touch sensor disposed under the touch sensitive element and having a plurality of touch electrodes, and each of the plurality of electrodes of the touch sensitive element overlaps with one touch electrode from among the plurality of touch electrodes in a one to one correspondence.

Claims

1. A display device comprising:

a touch sensitive element having 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 display panel disposed under the touch sensitive element; and

a touch sensor disposed under the touch sensitive element and having a plurality of touch electrodes,

wherein each of the plurality of electrodes of the touch sensitive element overlaps with one touch electrode of the plurality of touch electrodes in a one to one correspondence.

2. The display device according to claim 1, wherein an area of each of the plurality of electrodes of the touch sensitive element is equal to or smaller than an area of the corresponding one touch electrode of the plurality of touch electrodes.

3. The display device according to claim 1, wherein each of the plurality of touch electrodes overlaps with two or more electrodes of the plurality of electrodesof the touch sensitive element.

4. The display device according to claim 1, wherein the touch sensitive element includes a plurality of cells in which the plurality of electrodes are disposed, and

each of the plurality of cells overlaps with one touch electrode of the plurality of touch electrodes in a one to one correspondence.

5. The display device according to claim 4, wherein each of the plurality of cells includes a driving circuit implemented by an active matrix method.

6. The display device according to claim 1, wherein the touch sensor is an in-cell type touch sensor integrated in the display panel, and

the plurality of touch electrodes are a plurality of common electrodes driving the display panel.

7. The display device according to claim 6, wherein the display device is time-division driven into an image display period and a touch sensing period, and

during the image display period, a common voltage is applied to the plurality of touch electrodes and a driving voltage is applied to the plurality of electrodes of the touch sensitive element, and

during the touch sensing period, the plurality of electrodes of the touch sensitive element are floating.

8. The display device according to claim 1, wherein the touch sensor is an on-cell type touch sensor in which the plurality of touch electrodes is disposed on a top surface of the display panel.

9. The display device according to claim 8, wherein the display device is time-division driven into a touch sensing period and a touch sensitive element driving period, and

the plurality of electrodes of the touch sensitive element are floating during the touch sensing period.

10. The display device according to claim 1, wherein the electroactive layer comprises an electroactive polymer, and

the plurality of electrodes of the touch sensitive element comprises a transparent conductive material.

11. The display device according to claim 1, wherein the touch sensitive element includes a plurality of cells, and

two touch electrodes of the plurality of electrodes having a comb shape and two electrodes of the plurality of electrodes having a shape corresponding to the shape of the two touch electrodes are disposed n each of the plurality of cells.

12. A display device comprising:

a display panel;

a touch sensor having a plurality of touch electrodes disposed in the display panel or on a top surface of the display panel; and

a touch sensitive element disposed on the display panel and the touch sensor,

wherein the touch sensitive element includes

an electroactive layer, and

a plurality of electrodes disposed on at least one surface of the electroactive layer and

wherein each of the plurality of electrodes corresponds with one touch electrode among the plurality of touch electrodes, respectively, in a one to one correspondence.

13. The display device according to claim 12, wherein the display panel is a liquid crystal display panel, and

the plurality of touch electrodes are common electrodes of the liquid crystal display panel.

14. The display device according to claim 12, wherein the display panel is an organic light emitting display panel, and

the plurality of touch electrodes is disposed on a top surface of an upper substrate of the organic light emitting display panel.

15. The display device according to claim 12, wherein an area of each of the plurality of electrodes of the touch sensitive element is equal to or smaller than an area of the corresponding one touch electrode of the plurality of touch electrodes.

16. The display device according to claim 12, wherein the plurality of electrodes of the touch sensitive element includes a plurality of first electrodes disposed on a top surface of the electroactive layer and a plurality of second electrodes disposed on a bottom surface of the electroactive layer, and

each of the first electrodes and each of the second electrodes overlapping with each other are disposed to overlap with the same one touch electrode of the plurality of touch electrodes in a one to one correspondence.

17. The display device according to claim 12, wherein the plurality of electrodes of the touch sensitive element includes a plurality of first electrodes and a plurality of second electrodes disposed on the same surface of the electroactive layer,

each of the first electrodes and each of the second electrodes are spaced apart from each other, and

each of the first electrodes and each of the second electrodes overlapping with each other are disposed to overlap with the same one touch electrode of the plurality of touch electrodes in a one to one correspondence.

18. A method of driving a display device, the method comprising:

applying a common voltage to a plurality of common electrodes of a display panel in which a touch panel is integrated and applying a driving voltage to a plurality of electrodes disposed on at least one surface of an electroactive layer of a touch sensitive element positioned on the display panel, during an image display period; and

applying a touch signal to the plurality of common electrodes and floating the plurality of electrodes of the touch sensitive element, during a touch sensing period,

wherein each of the plurality of electrodes of the touch sensitive element overlaps with one common electrode of the plurality of common electrodes in a one to one correspondence.