Touch display panel and display device

• US 9,823,789 B2
• Filed: 08/16/2014
• Issued: 11/21/2017
• Est. Priority Date: 04/18/2014
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Ding, Xiaoliang, Wang, Haisheng, Liu, Yingming, Ren, Tao
• Primary Examiner(s): Cheng, Joe H
• Application Number:
  US14/440,690
• Publication Number:
  US 20160098113A1
• Time in Patent Office: 1,193 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 3/0443 using a single layer of sensing electrodes

Abstract

A touch panel and a display device are disclosed. The touch panel comprises: a plurality of self-capacitance electrodes (04) disposed in a same layer and independent from each other; a plurality of wires (05) connecting the self-capacitance electrodes (04) to a margin frame of the touch panel; and periphery wirings (07) located at the margin frame of the touch panel and connected with the wires (05) one to one. Each of the wires (05) is electrically connected with at least two self-capacitance electrodes that are provided non-adjacent to each other (04) and self-capacitance electrodes (04) electrically connected with different wires (05) do not overlap each other. The touch panel can reduce touch dead zone in the touch panel utilizing self-capacitance principle.

Claims

1. A touch panel comprising:

a plurality of self-capacitance electrodes disposed in a same layer and independent from each other;

a plurality of wires connecting the self-capacitance electrodes to a margin frame of the touch panel, wherein each of the wires is electrically connected with at least two self-capacitance electrodes that are provided non-adjacent to each other and self-capacitance electrodes electrically connected with different wires do not overlap with each other;

periphery wirings located at the margin frame of the touch panel and connected with the wires in a one-to-one manner;

a touch sensing chip electrically connected with the periphery wirings via connection terminals;

a top substrate and a bottom substrate disposed oppositely to each other;

a black matrix layer disposed on a side of the top substrate facing the bottom substrate; and

a color filter layer disposed on the black matrix layer,

wherein the self-capacitance electrodes are located between the black matrix layer and the color filter layer,

wherein the plurality of self-capacitance electrodes includes a first self-capacitance electrode, a second self-capacitance electrode, a third self-capacitance electrode and a fourth self-capacitance electrode,

wherein the first self-capacitance electrode and the second self-capacitance electrode are non-adjacent to each other and are connected to a first wire, the third self-capacitance electrode is adjacent to the first self-capacitance electrode and connected to a second wire, and the fourth self-capacitance electrode is adjacent to the second self-capacitance electrode and connected to a third wire, and

wherein the touch sensing chip is configured to detect a touch on the first self-capacitance electrode by detecting signal changes on the first wire and the second wire and detecting no signal change on the third wire.

2. The touch panel of claim 1, wherein the self-capacitance electrodes are disposed on a side of the top substrate facing the bottom substrate.

3. The touch panel of claim 2, wherein the self-capacitance electrodes and the wires have orthogonal projections on the bottom substrate that are within a region corresponding to a pattern of the black matrix layer.

4. The touch panel of claim 3, wherein the orthogonal projections of the self-capacitance electrodes on the bottom substrate are of a mesh structure within the region corresponding to the pattern of the black matrix layer.

5. The touch panel of claim 3, wherein the wires are located between the black matrix layer and the color filter layer, or on the color filter layer.

6. The touch panel of claim 5, wherein a planarization layer is disposed between the black matrix layer and the color filter layer, the planarization layer has through holes or grooves at least in regions corresponding to patterns of the self-capacitance electrodes, and patterns of the self-capacitance electrodes fill in the through holes or grooves.

7. The touch panel of claim 6, wherein the through holes or grooves are of a trapezoid shape.

8. The touch panel of claim 6, wherein a surface area of the self-capacitance electrodes filled in the through holes or grooves is greater than a basal area of the through holes or grooves.

9. The touch panel of claim 2, wherein opposite sides of adjacent two self-capacitance electrodes are both fold lines.

10. The touch panel of claim 9, wherein the opposite sides of adjacent two self-capacitance electrodes that are fold lines both have step-like structures that are consistent and matching each other;

and/or

the opposite sides of adjacent two self-capacitance electrodes that are fold lines both have concave-convex structures that are consistent and matching each other.

11. The touch panel of claim 1, wherein each of the wires is electrically connected with two self-capacitance electrodes that are disposed not adjacent to each other, and each of the wires is disposed in a same layer as the self-capacitance electrodes.

12. The touch panel of claim 1, wherein the margin frame of the touch panel is of a rectangle shape, and extension directions of the wires are consistent with a direction of a short side of the margin frame.

13. The touch panel of claim 1, wherein the margin frame of the touch panel has four sides, and each of the self-capacitance electrodes are connected to a closest side via a corresponding one of the wires while the wires do not intersect each other.

14. The touch panel of claim 1, wherein the wires and the self-capacitance electrodes are disposed on different layers, and the self-capacitance electrodes and corresponding wires are electrically connected through via holes.

15. The touch panel of claim 14, wherein the wires are located on the color filter layer and are electrically connected with corresponding self-capacitance electrodes through via holes in the color filter layer.

16. The touch panel of claim 1, wherein opposite sides of adjacent two self-capacitance electrodes are both fold lines.

17. The touch panel of claim 16, wherein the opposite sides of adjacent two self-capacitance electrodes that are fold lines both have step-like structures that are consistent and matching each other;

and/or

the opposite sides of adjacent two self-capacitance electrodes that are fold lines both have concave-convex structures that are consistent and matching each other.

18. A display device comprising the touch panel of claim 1.

19. A touch panel comprising:

a plurality of self-capacitance electrodes disposed in a same layer and independent from each other;

a plurality of wires connecting the self-capacitance electrodes to a margin frame of the touch panel, wherein each of the wires is electrically connected with at least two self-capacitance electrodes that are provided non-adjacent to each other and self-capacitance electrodes electrically connected with different wires do not overlap with each other;

periphery wirings located at the margin frame of the touch panel and connected with the wires in a one-to-one manner; and

a touch sensing chip electrically connected with the periphery wirings via connection terminals,

wherein the plurality of self-capacitance electrodes includes a first self-capacitance electrode, a second self-capacitance electrode, a third self-capacitance electrode and a fourth self-capacitance electrode,

wherein the first self-capacitance electrode and the second self-capacitance electrode are non-adjacent to each other and are connected to a first wire, the third self-capacitance electrode is adjacent to the first self-capacitance electrode and connected to a second wire, and the fourth self-capacitance electrode is adjacent to the second self-capacitance electrode and connected to a third wire, and

wherein the touch sensing chip is configured to detect a touch on the first self-capacitance electrode by detecting signal changes on the first wire and the second wire and detecting no signal change on the third wire.

20. The touch panel of claim 19, further comprising:

a top substrate and a bottom substrate disposed oppositely to each other; and

a black matrix layer disposed on a side of the top substrate facing the bottom substrate,

wherein the self-capacitance electrodes are disposed on a side of the top substrate facing the bottom substrate, and the self-capacitance electrodes and the wires have orthogonal projections on the bottom substrate that are within a region corresponding to a pattern of the black matrix layer.