In-cell touch panel and display device with self-capacitance electrodes

• US 10,013,121 B2
• Filed: 07/11/2014
• Issued: 07/03/2018
• Est. Priority Date: 01/28/2014
• 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: Wang, Haisheng, Dong, Xue, Xue, Hailin, Liu, Yingming, Ding, Xiaoliang, Yang, Shengji, Zhao, Weijie, Liu, Hongjuan, Ren, Tao
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US14/422,522
• Publication Number:
  US 20160018922A1
• Time in Patent Office: 1,453 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 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 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/04166 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
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

An in-cell touch panel and a display device are provided. The touch panel includes: an upper substrate and a lower substrate provided opposite to each other, a plurality of self-capacitance electrodes which are disposed between the upper substrate and the lower substrate and provided in a same layer and insulated from each other, and a touch detection chip configured to determine a touch position by detecting capacitance variation of the self-capacitance electrodes in the touch time-period. Thus, an in-cell touch panel with higher touch accuracy, lower cost, higher productivity and higher transmittance can be obtained.

Claims

1. An in-cell touch panel, comprising:

a touch detection chip;

an upper substrate and a lower substrate provided opposite to each other;

a plurality of self-capacitance electrodes disposed between the upper substrate and the lower substrate and provided in a same layer and insulated from each other;

a black matrix layer disposed between the upper substrate and the lower substrate; and

a color filter layer disposed on the black matrix layer,

wherein a planarization layer is further disposed between the black matrix layer and the color filter layer, the planarization layer is provided with a trapezoidal through hole at least in an area corresponding to a pattern of each self-capacitance electrode, the pattern of each self-capacitance electrode is at least filled into the trapezoidal through hole, and each self-capacitance electrode is in direct contact with the black matrix layer via a base of the trapezoidal through hole, with the base of the trapezoidal through hole being in direct contact with the black matrix layer.

2. The in-cell touch panel according to claim 1, wherein an orthographic projection of a pattern of each of the self-capacitance electrodes on the lower substrate is disposed in an area provided with a pattern of the black matrix layer.

3. The in-cell touch panel according to claim 2, wherein the orthographic projection of the pattern of each of the self-capacitance electrodes on the lower substrate comprises a latticed structure disposed in the area provided with the pattern of the black matrix layer.

4. The in-cell touch panel according to claim 3, further comprising:

conductive wires respectively corresponding to the self-capacitance electrodes, and conduction nodes respectively corresponding to the self-capacitance electrodes, wherein

an orthographic projection of each of the conductive wires on the lower substrate is disposed in the area provided with the pattern of the black matrix layer;

each of the conduction nodes is disposed in an area provided with a sealant frame of the in-cell touch panel; and

each of the self-capacitance electrodes is electrically connected with a connection terminal of the touch detection chip through a leading wire in the area provided with the sealant frame, after being connected to the conduction node through the conductive wire.

5. The in-cell touch panel according to claim 2, further comprising:

conductive wires respectively corresponding to the self-capacitance electrodes, and conduction nodes respectively corresponding to the self-capacitance electrodes, wherein

an orthographic projection of each of the conductive wires on the lower substrate is disposed in the area provided with the pattern of the black matrix layer;

each of the conduction nodes is disposed in an area provided with a sealant frame of the in-cell touch panel; and

each of the self-capacitance electrodes is electrically connected with a connection terminal of the touch detection chip through a leading wire in the area provided with the sealant frame, after being connected to the conduction node through the conductive wire.

6. The in-cell touch panel according to claim 5, wherein the conductive wires and the self-capacitance electrodes are provided in a same layer.

7. The in-cell touch panel according to claim 6, wherein the area provided with the sealant frame of the in-cell touch panel has four sides;

and the conduction nodes are distributed on all the four sides of the area provided with the sealant frame.

8. The in-cell touch panel according to claim 7, wherein the conduction nodes, to which the self-capacitance electrodes correspond, are distributed on a side, closest to the self-capacitance electrodes, of the area provided with the sealant frame.

9. The in-cell touch panel according to claim 8, wherein

the black matrix layer is disposed on a side of the upper substrate facing the lower substrate;

and

the self-capacitance electrodes and the conductive wires are disposed between the black matrix layer and the color filter layer or disposed on the color filter layer.

10. The in-cell touch panel according to claim 7, wherein

the black matrix layer is disposed on a side of the upper substrate facing the lower substrate;

and

the self-capacitance electrodes and the conductive wires are disposed between the black matrix layer and the color filter layer or disposed on the color filter layer.

11. The in-cell touch panel according to claim 6, wherein

the black matrix layer is disposed on a side of the upper substrate facing the lower substrate;

and

the self-capacitance electrodes and the conductive wires are disposed between the black matrix layer and the color filter layer or disposed on the color filter layer.

12. The in-cell touch panel according to claim 6, wherein the conduction nodes, to which the self-capacitance electrodes correspond, are distributed on a side, closest to the self-capacitance electrodes, of the area provided with the sealant frame.

13. The in-cell touch panel according to claim 5, wherein the conductive wires and the self-capacitance electrodes are provided in different layers;

and the self-capacitance electrodes and the corresponding conductive wires are correspondingly electrically connected with each other via through holes.

14. The in-cell touch panel according to claim 13, wherein

the black matrix layer is disposed on a side of the upper substrate facing the lower substrate;

the self-capacitance electrodes are disposed between the black matrix layer and the color filter layer; and

the conductive wires are disposed on the color filter layer and electrically connected with the corresponding self-capacitance electrodes via through holes in the color filter layer.

15. The in-cell touch panel according to claim 1, wherein

a surface area of the self-capacitance electrode filled into the trapezoidal through hole is greater than an area of the base of the trapezoidal through hole.

16. The in-cell touch panel according to claim 1, wherein both opposite sides of two adjacent self-capacitance electrodes each comprise a zigzag line.

17. The in-cell touch panel according to claim 16, wherein both the opposite sides, comprising the zigzag line, of the two adjacent self-capacitance electrodes each have a stepped structure, and two stepped structures have a conformable shape and are matched with each other;

and/or

both the opposite sides, comprising the zigzag line, of the two adjacent self-capacitance electrodes each have a concave-convex structure, and two concave-convex structures have a conformable shape and are matched with each other.

18. The in-cell touch panel according to claim 1, further comprising:

a display drive chip, wherein the display drive chip and the touch detection chip are integrated into a chip.

19. A display device, comprising an in-cell touch panel according to claim 1.

20. An in-cell touch panel, comprising:

a touch detection chip;

an upper substrate and a lower substrate provided opposite to each other;

a plurality of self-capacitance electrodes disposed between the upper substrate and the lower substrate and provided in a same layer and insulated from each other;

a black matrix layer disposed between the upper substrate and the lower substrate; and

a color filter layer disposed on the black matrix layer,

wherein a planarization layer is further disposed between the black matrix layer and the color filter layer, the planarization layer is provided with a trapezoidal channel at least in an area corresponding to a pattern of each self-capacitance electrode, and the pattern of each self-capacitance electrode is at least filled into the trapezoidal channel, with each self-capacitance electrode that is filled inside the trapezoidal channel being in direct contact with the planarization layer at a base and two sides of the trapezoidal channel.