Touch substrate, display device and driving method thereof

• US 10,216,323 B2
• Filed: 10/28/2016
• Issued: 02/26/2019
• Est. Priority Date: 10/30/2015
• 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: Ding, Xiaoliang, Dong, Xue, Wang, Haisheng, Chen, Xiaochuan, Liu, Yingming, Yang, Shengji, Zhao, Weijie, Liu, Wei, Li, Changfeng, Wang, Pengpeng, Ren, Tao, Liu, Hongjuan
• Primary Examiner(s): Blancha, Jonathan M
• Application Number:
  US15/519,608
• Publication Number:
  US 20170262125A1
• Time in Patent Office: 851 Days
• Field of Search: 345174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch substrate, a display device and a driving method thereof, touch pressure driving electrodes and touch pressure sensing electrodes provided between the layer where the touch detecting electrodes is located and the substrate carrier are added within the touch substrate, and the touch pressure sensing electrodes and the touch pressure driving electrodes constitute a mutual-capacitance structure. When the touch substrate is pressed, the distance between the touch substrate and the underlying metal layer becomes small, causing that capacitance value of the mutual-capacitance structure becomes small. During the time period for detecting pressure, through applying the touch driving signal to the touch pressure driving electrodes to detect the change of signal amount of the touch pressure sensing electrodes caused by the pressure on the touch position, the change of the capacitance value of the mutual-capacitance structure can be determined to achieve the function of pressure sensing. During the time period for detecting touching, the touch detecting electrodes, the touch pressure driving electrodes, and the touch pressure sensing electrodes are applied with the same touch detecting signal simultaneously, the touch position can be determined by detecting the change of the capacitance value of each of the touch detecting electrodes, and the function of the two-dimensional detection of touching can be realized.

Claims

1. A touch substrate, comprising

a substrate carrier,

touch detecting electrodes, disposed above the substrate carrier,

touch pressure driving electrodes and touch pressure sensing electrodes, disposed between a layer where the touch detecting electrodes are located and the substrate carrier, the touch pressure driving electrodes being disposed in a different layer from a layer where the touch pressure sensing electrodes are disposed, and each of the touch pressure driving electrodes and a corresponding touch pressure sensing electrode constituting a mutual-capacitance structure;

and

a touch detection chip, configured to;

during a time period for detecting touch, load a touch detecting signal simultaneously on the touch detecting electrodes, the touch pressure driving electrodes, and the touch pressure sensing electrodes to detect a change of capacitance value of each of the touch detecting electrodes so as to determine a touch position;

during a time period for detecting pressure, load a touch driving signal on the touch pressure driving electrodes to detect a change of a signal amount of each of the touch pressure sensing electrodes caused by a pressure on the touch position.

2. The touch substrate of claim 1, wherein,

the touch substrate is an array substrate, and each of the touch pressure driving electrodes comprises at least one driving signal line disposed at a gap between columns of pixels in the array substrate and disposed in a same layer as a data line.

3. The touch substrate of claim 2, wherein,

the driving signal lines belonging to a same touch pressure driving electrode are electrically connected to each other through a first wire disposed in a same layer as a gate line.

4. The touch substrate of claim 3, wherein,

each of the driving signal lines belonging to the same touch pressure driving electrode is connected to the first wire through a via hole extending through a layer where the driving signal line is located and a layer where the first wire is located.

5. The touch substrate of claim 2, wherein,

each of the touch detecting electrodes comprises a plurality of self-capacitance electrodes disposed in a same layer and independent to each other.

6. The touch substrate of claim 5, wherein,

each of the self-capacitance electrodes constitutes a common electrode layer on the array substrate.

7. The touch substrate of claim 2, wherein,

each of the touch detecting electrodes comprises a touch driving electrode and a touch sensing electrode which intersect with each other.

8. The touch substrate of claim 2, wherein, during the time period for detecting touch, a same signal as the touch detecting signal is applied to the gate line and the data line in the array substrate.

9. The touch substrate of claim 1, wherein,

the touch substrate is an array substrate, and each of the touch pressure sensing electrodes comprises at least one sensing signal line disposed at a gap between columns of pixels in the array substrate and disposed in a same layer as a gate line.

10. The touch substrate of claim 9, wherein,

the sensing signal lines belonging to a same touch pressure sensing electrode are electrically connected to each other through a second wire disposed in a same layer as a data line.

11. The touch substrate of claim 10, wherein,

each of the sensing signal lines belonging to the same touch pressure sensing electrode is connected to the second wire through a via hole extending through a layer where the sensing signal line is located and a layer where the second wire is located.

12. The touch substrate of claim 9, further comprising floating electrodes, wherein each of the floating electrodes are disposed at a gap between columns of the pixels other than the gap between columns of the pixels disposed with the sensing signal line, and the floating electrodes are disposed in the same layer as the gate line.

13. The touch substrate of claim 12, wherein,

each of the touch detecting electrodes comprises a plurality of self-capacitance electrodes provided in a same layer and independent to each other.

14. The touch substrate of claim 12, wherein,

each of the touch detecting electrodes comprises a touch driving electrode and a touch sensing electrode which intersect with each other.

15. A display device, comprising a touch substrate, and a metal layer provided below the touch substrate, the touch substrate comprises

a substrate carrier,

touch detecting electrodes, disposed above the substrate carrier,

touch pressure driving electrodes and touch pressure sensing electrodes, disposed between a layer where the touch detecting electrodes are located and the substrate carrier, the touch pressure driving electrodes being disposed in a different layer from a layer where the touch pressure sensing electrodes are disposed, and each of the touch pressure driving electrodes and a corresponding touch pressure sensing electrode constituting a mutual-capacitance structure;

and

a touch detection chip, configured to;

during a time period for detecting touch, load a touch detecting signal simultaneously on the touch detecting electrodes, the touch pressure driving electrodes, and the touch pressure sensing electrodes to detect a change of capacitance value of each of the touch detecting electrodes so as to determine a touch position;

during a time period for detecting pressure, load a touch driving signal on the touch pressure driving electrodes to detect a change of a signal amount of each of the touch pressure sensing electrodes caused by a pressure on the touch position.

16. The display device of claim 15, wherein,

the touch substrate is an array substrate, and each of the touch pressure driving electrodes comprises at least one driving signal line disposed at a gap between columns of pixels in the array substrate and disposed in a same layer as a data line.

17. The display device of claim 15, wherein, the metal layer is a middle frame of a mobile phone or a backlit metal on a back surface of a backlight module of a liquid display panel.

18. A driving method for the display device of claim 15, comprising:

during the time period for detecting touch, applying the touch detecting signal to the touch detecting electrodes, the touch pressure driving electrodes, and the touch pressure sensing electrodes simultaneously, detecting a change of capacitance value of each of the touch detecting electrodes to determine a touch position; and

during the time period for detecting pressure, applying the touch driving signal to the touch pressure driving electrodes to detect a change of signal amount of each of the touch pressure sensing electrodes caused by the pressure on the touch position.

19. The driving method of claim 18, wherein the metal layer is a middle frame of a mobile phone or a backlit metal on a back surface of a backlight module of a liquid display panel.

20. The driving method of claim 18 further comprising:

during the time period for detecting touch, applying a same signal as the touch detecting signal to the gate line and the data line.