In-cell touch panel and display device

• US 10,459,573 B2
• Filed: 08/21/2015
• Issued: 10/29/2019
• Est. Priority Date: 01/16/2015
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Li, Changfeng, Dong, Xue, Wang, Haisheng, Liu, Yingming, Yang, Shengji
• Primary Examiner(s): Tung, David
• Application Number:
  US14/914,592
• Publication Number:
  US 20160357337A1
• Time in Patent Office: 1,530 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• 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 3/04166 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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
• 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

Abstract

An in-cell touch panel and a display device are provided, and the in-cell touch panel includes: an upper substrate and a lower substrate which are opposite to each other; a plurality of separate self-capacitive electrodes arranged in an array and in a same layer; and a plurality of conductive wires respectively connected with the self-capacitive electrodes. Both the conductive wires and the self-capacitive electrodes are arranged at a side, facing the lower substrate, of the upper substrate, or at a side, facing the upper substrate, of the lower substrate; and the self-capacitive electrodes each are provided with a plurality of hollowed-out regions. The in-cell touch panel can improve the touch control sensitivity of the touch panel while ensuring a narrow frame design.

Claims

1. An in-cell touch panel, comprising:

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

a plurality of separate self-capacitive electrodes, arranged in an array and in a same layer;

a plurality of conductive wires connected with the self-capacitive electrodes, wherein the in-cell touch panel is configured for detecting a touch through detecting capacitance change of each of the self-capacitive electrodes; and

a touch control detection chip, configured to determine a touch position in a touch control time period by detecting a capacitance variation of each of the self-capacitive electrodes, wherein the plurality of the conductive wires connect the plurality of separate self-capacitive electrodes to the touch control detection chip,

wherein;

each of the self-capacitive electrodes is provided with a plurality of hollowed-out regions disposed in rows and columns;

the in-cell touch panel further comprises a plurality of display pixels, each of which is provided with an opening region;

the hollowed-out regions of each self-capacitive electrode each correspond to the opening region of at least one display pixel, and an orthographic projection of the opening region of the at least one display pixel on the each self-capacitive electrode falls within the corresponding hollowed-out region;

the in-cell touch panel further comprises common electrodes which are disposed in a same layer as the self-capacitive electrodes, respectively arranged within the hollowed-out regions of the self-capacitive electrodes, and insulated from the self-capacitive electrodes;

the touch control detection chip is further configured to apply a common electrode signal to the common electrodes in a display time period;

the in-cell touch panel has a driving mode in which a first driving for touch function and a second driving for display function are performed simultaneously; and

each of the self-capacitive electrodes corresponds to a plurality of pixels disposed on the lower substrate, and the common electrodes are respectively arranged at least at positions, to which opening regions of the pixels respectively correspond.

2. The in-cell touch panel according to claim 1, wherein shapes of the common electrodes are identical to those of the hollowed-out regions.

3. The in-cell touch panel according to claim 1, wherein a gap between each of the self-capacitive electrodes and each of the common electrodes which are respectively arranged within the hollowed-out regions of the self-capacitive electrodes is from 4 μ

m to 10 μ

m.

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

a common electrode wire which is electrically connected with each of the common electrodes through a via hole.

5. The in-cell touch panel according to claim 4, wherein the conductive wires and the common electrode wire are disposed in a same layer, and each of the conductive wires is electrically connected with a corresponding self-capacitive electrode through a via hole.

6. The in-cell touch panel according to claim 1, wherein the hollowed-out regions each have a maximum inside diameter of 1 mm.

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

a black matrix layer arranged at a side, facing the lower substrate, of the upper substrate, or at a side, facing the upper substrate, of the lower substrate,

wherein an orthographic projection, on the lower substrate, of each self-capacitive electrode is located within an orthographic projection, on the lower substrate, of the black matrix layer.

8. The in-cell touch panel according to claim 1, wherein the conductive wires respectively connect the self-capacitive electrodes to a frame of the in-cell touch panel;

the in-cell touch panel further comprises peripheral leading wires arranged at the frame of the in-cell touch panel and respectively electrically connected with the conductive wires; and

the touch control detection chip is electrically connected with each of the peripheral leading wires through a connection terminal.

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

a frame of the in-cell touch panel has four sides, each of the self-capacitive electrodes is connected to a side closest to this self-capacitive electrode through a corresponding conductive wire on the basis that the conductive wires are not intersected with each other;

or

a shape of the frame of the in-cell touch panel is rectangular, and each of the conductive wires has an extending direction identical to a short-side direction or a long-side direction of the frame.

10. A display device, comprising the in-cell touch panel according to claim 1.

11. The in-cell touch panel according to claim 1, wherein a shape of each of the common electrodes comprises a slit.

12. The in-cell touch panel according to claim 11, further comprising a plurality of pixel electrodes which are corresponding to the common electrodes in a one-to-one correspondence, wherein the pixel electrodes are between a layer where the common electrodes are located and a layer where the conductive wires are located.