IN-CELL TOUCH PANEL AND DISPLAY DEVICE

• US 20160216802A1
• Filed: 08/21/2015
• Published: 07/28/2016
• Est. Priority Date: 01/09/2015
• 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: Bao, Zhiying, Lv, Zhenhua, Li, Yanchen, Xu, Rui, Zhao, Weijie, Chen, Xi, Wang, Haisheng
• Granted Patent: US 10,191,599 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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

An in-cell touch screen and a display device are provided. In the in-cell touch screens, an insulation layer, in an area that each self-capacitance electrode overlap a wire, is provided with at least a first hole that runs through the insulation layer and each self-capacitance electrode is electrically connected with a corresponding wire via a corresponding first via hole; each self-capacitance electrode, within an area overlapping other wire than the corresponding wire and at a position corresponding to the first via hole, is disposed with a second via hole that runs through the self-capacitance electrode. An orthogonal projection of a second via hole on a lower substrate covers an orthogonal projection of a first via hole on the lower substrate. The in-cell touch screen can solve a problem of uneven image display due to nonuniform distribution of via holes in an insulation layer.

Claims

1. An in-cell touch screen, comprising:

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

a plurality of mutually independent self-capacitance electrodes disposed on a side, facing the lower substrate, of the upper substrate, or disposed on side, facing the upper substrate, of the lower substrate;

wires that are disposed on a different layer from the self-capacitance electrodes and electrically connected correspondingly with the self-capacitance electrodes; and

an insulation layer that is provided between the self-capacitance electrodes and the wires;

wherein the insulation layer, in an area that each self-capacitance electrodes overlaps a corresponding wire, is provided with at least a first hole that runs through the insulation layer and each self-capacitance electrode is electrically connected with the corresponding wire via a corresponding first via hole;

each self-capacitance electrode, within an area overlapping other wire than the corresponding wire and at a position corresponding to the first via hole, is disposed with a second via hole, and the second via hole runs through the self-capacitance electrode, and an orthogonal projection of the second via hole on the lower substrate covers an orthogonal projection of the first via hole on the lower substrate.

2. The in-cell touch screen according to claim 1, wherein shapes and sizes of first via holes are the same.

3. The in-cell touch screen according to claim 1, wherein a diameter of the first via hole is less than a width of a wire at a corresponding position.

4. The in-cell touch screen according to claim 1, wherein a diameter of the second via hole is less than a width of a wire at a corresponding position.

5. The in-cell touch screen according to claim 1, further comprising:

a conductive base block that is disposed on a same layer as the respective wires and corresponds to each first via hole, and an orthogonal projection of the conductive base block on the lower substrate covers the orthogonal projection of the second via hole on the lower substrate;

each wire is connected with a corresponding self-capacitance electrode via a corresponding conductive base block.

6. The in-cell touch screen according to claim 1, wherein the wires extend in a same direction.

7. The in-cell touch screen according to claim 1, wherein lengths of the wires are the same.

8. The in-cell touch screen according to claim 1, wherein the plurality of mutually independent self-capacitance electrodes are arranged in an array and the wires extends in a column direction or a row direction.

9. The in-cell touch screen according to claim 1, wherein as for each self-capacitance electrode, a distribution rule of the first via hole located within an area that the self-capacitance electrode overlaps the other respective wires, than the corresponding wire that is electrically connected to the self-capacitance electrode, is the same as that of the first via hole within an area that the self-capacitance electrode overlaps the corresponding wire that is electrically connected to the self-capacitance electrode.

10. The in-cell touch screen according to claim 1, wherein as for each wire, a distance between any two adjacent first via holes both having an overlapped area with the wire is the same.

11. The in-cell touch screen according to claim 1, wherein the plurality of mutually independent self-capacitance electrodes is disposed on a same layer.

12. The in-cell touch screen according to claim 11, wherein in the case where the self-capacitance electrodes are disposed in a common electrode layer on the side, facing the upper substrate, of the lower substrate, the in-cell touch screen further comprise:

a touch detection chip;

the touch detection chip is configured to apply a common electrode signal on the respective self-capacitance electrodes in a display period and determine a touch position by detecting variation of capacitance value of the respective self-capacitance electrodes in a touching period.

13. The in-cell touch screen according to claim 1, further comprising:

data lines located below the self-capacitance electrodes, wherein the respective wires and the data lines are disposed on a same layer and formed of same material.

14. The in-cell touch screen according to claim 1, further comprising:

a black matrix layer on the side, facing the upper substrate, of the lower substrate or on the side, facing the lower substrate, of the upper substrate;

an orthogonal projection of a pattern of the respective wires is located within an area that a pattern of the black matrix layer is located;

or an orthogonal projection of a pattern of the respective second via holes on the lower substrate is located within an area that the pattern of the black matrix is located.

15. A display device, comprising the in-cell touch screen according to claim 1.

16. The in-cell touch screen according to claim 5, wherein the plurality of mutually independent self-capacitance electrodes are arranged in an array and the wires extends in a column direction or a row direction.

17. The in-cell touch screen according to claim 5, wherein as for each self-capacitance electrode, a distribution rule of the first via hole located within an area that the self-capacitance electrode overlaps the other respective wires, than the corresponding wire that is electrically connected to the self-capacitance electrode, is the same as that of the first via hole within an area that the self-capacitance electrode overlaps the corresponding wire that is electrically connected to the self-capacitance electrode.

18. The in-cell touch screen according to claim 5, wherein the plurality of mutually independent self-capacitance electrodes is disposed on a same layer.

19. The in-cell touch screen according to claim 18, wherein in the case where the self-capacitance electrodes are disposed in a common electrode layer on the side, facing the upper substrate, of the lower substrate, the in-cell touch screen further comprise:

a touch detection chip;

the touch detection chip is configured to apply a common electrode signal on the respective self-capacitance electrodes in a display period and determine a touch position by detecting variation of capacitance value of the respective self-capacitance electrodes in a touching period.

20. The in-cell touch screen according to claim 19, further comprising:

a black matrix layer on the side, facing the upper substrate, of the lower substrate or on the side, facing the lower substrate, of the upper substrate;

an orthogonal projection of a pattern of the respective wires is located within an area that a pattern of the black matrix layer is located;

or an orthogonal projection of a pattern of the respective second via holes on the lower substrate is located within an area that the pattern of the black matrix is located.