Touch-integrated display device

• US 10,331,248 B2
• Filed: 12/13/2016
• Issued: 06/25/2019
• Est. Priority Date: 12/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Hyunho, Kim, MinBo, Seo, Dongmin, Kim, Inseop
• Primary Examiner(s): Elahi, Towfiq
• Application Number:
  US15/377,977
• Publication Number:
  US 20170192568A1
• Time in Patent Office: 924 Days
• 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: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A disclosed display device includes a plurality of touch electrodes, a plurality of sensing lines, and a plurality of transistors. Each of the touch electrodes includes a group of common voltage electrodes among a plurality of common voltage elongated along a first direction. The plurality of sensing lines are elongated along a second direction and intersects the plurality of common voltage electrodes. Each of the plurality of sensing lines is coupled to a corresponding group of the common voltage electrodes. The plurality of pixels include a plurality of transistors. Each of the plurality of transistors controls an amount of light output from a corresponding pixel of the plurality of pixels according to a voltage at a gate electrode of said each of the plurality of transistors. The gate electrode is formed in a corresponding separation area between two adjacent common voltage electrodes of the plurality of common voltage electrodes.

Claims

1. A display device comprising:

a plurality of pixel electrodes;

a plurality of touch electrodes, each of the touch electrodes including a group of common voltage electrodes among a plurality of common voltage electrodes, each of the common voltage electrodes in the group of common voltage electrodes being connected in a same layer to its one or more adjacent remaining ones in the group of common voltage electrodes in a first direction and overlapping two or more corresponding pixel electrodes of the display device, said each of the plurality of common voltage electrodes separated from other one or more adjacent ones of the plurality of common voltage electrodes in a second direction;

a plurality of sensing lines, each of the sensing lines coupled to a corresponding touch electrode of the plurality of touch electrodes, electrically connecting directly adjacent common voltage electrodes in the group of common voltage electrodes of the corresponding touch electrode, and transferring a touch driving signal to the corresponding touch electrode; and

a plurality of transistors, each of the plurality of transistors including a gate electrode, a source electrode, and a drain electrode configured to transfer a data voltage to a corresponding pixel electrode of the plurality of pixel electrodes.

2. The display device according to claim 1, wherein a separation distance between two adjacent common voltage electrodes of the common voltage electrodes in a touch electrode of the plurality of touch electrodes is substantially equal to a separation distance between two adjacent touch electrodes of the plurality of touch electrodes.

3. The display device according to claim 1, wherein the plurality of sensing lines are elongated along the second direction.

4. The display device according to claim 1, further comprising:

a plurality of gate lines coupled to the plurality of transistors, each of the plurality of gate lines configured to supply a scan signal to a gate electrode of a corresponding transistor of the plurality of transistors,

wherein the plurality of gate lines are elongated along the first direction.

5. The display device according to claim 1, further comprising:

a plurality of gate lines coupled to the plurality of transistors, each of the plurality of gate lines configured to supply a scan signal to a gate electrode of a corresponding transistor of the plurality of transistors,

wherein said each of the plurality of gate lines is formed in a corresponding separation area between two adjacent common voltage electrodes of the plurality of common voltage electrodes.

6. The display device according to claim 1, wherein said each of the plurality of transistors includes a channel region formed in a corresponding separation area between two adjacent common voltage electrodes of the plurality of common voltage electrodes.

7. The display device according to claim 1, wherein a liquid crystal layer is positioned on the plurality of pixel electrodes and the plurality of common voltage electrodes.

8. The display device according to claim 1, wherein the plurality of sensing lines are formed on a same layer as the plurality of pixel electrodes.

9. The display device according to claim 1, wherein the plurality of common voltage electrodes are positioned on the plurality of sensing lines.

10. The display device according to claim 1, further comprising:

a data driver configured to supply the data voltage to one of the plurality of pixel electrodes in response to a common voltage at one of the plurality of common voltage electrodes; and

a touch driver configured to supply a touch driving signal to the plurality of common voltage electrodes, receive a response signal in response to the touch driving signal, and recognize an approach or touch of an external object based on the response signal.

11. A display device comprising:

a plurality of pixel electrodes;

a plurality of touch electrodes, each of the touch electrodes including a group of common voltage electrodes among a plurality of common voltage electrodes elongated along a first direction and overlapping two or more corresponding pixel electrodes of the display device;

a plurality of sensing lines elongated along a second direction and intersecting the plurality of common voltage electrodes, each of the plurality of sensing lines coupled to a corresponding touch electrode of the plurality of touch electrodes and electrically connecting directly adjacent common voltage electrodes in the group of the common voltage electrodes of the corresponding touch electrode; and

a plurality of pixels including a plurality of transistors, each of the plurality of transistors to control an amount of light output from a corresponding pixel of the plurality of pixels according to a voltage at a gate electrode of said each of the plurality of transistors, the gate electrode formed in a corresponding separation area between two adjacent common voltage electrodes of the plurality of common voltage electrodes.

12. The display device according to claim 11, wherein the plurality of touch electrodes include:

a first touch electrode including at least a first common voltage electrode and a second common voltage electrode adjacent to each other and separated by a first distance; and

a second touch electrode including at least a third common voltage electrode and a fourth common voltage electrode adjacent to each other, the second common voltage electrode and the third common voltage electrode adjacent to each other and separated by a second distance equal to the first distance.

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

a plurality of gate lines coupled to the plurality of pixels, each of the plurality of gate lines configured to supply a scan signal to a gate electrode of a corresponding transistor of the plurality of transistors,

wherein the plurality of gate lines are elongated along the first direction.

14. The display device according to claim 13, wherein said each of the plurality of gate lines is formed in the corresponding separation area between the two adjacent common voltage electrodes of the plurality of common voltage electrodes.

15. The display device according to claim 11, wherein said each of the plurality of transistors includes a channel region formed in the corresponding separation area between the two adjacent common voltage electrodes of the plurality of common voltage electrodes.

16. The display device according to claim 11, further comprising data lines overlapping with the plurality of sensing lines, the data lines configured to provide a data voltage for displaying an image to the plurality of transistors, the plurality of sensing lines disposed between the plurality of common voltage electrodes and the data lines.

17. The display device according to claim 11, wherein each of the plurality of pixel electrodes faces a corresponding common voltage electrode of the plurality of common voltage electrodes in the corresponding pixel of the plurality of pixels.

18. The display device according to claim 17, wherein the plurality of sensing lines are formed on a same layer as the plurality of pixel electrodes.