Display substrate and display device, pressure detection system and detection method thereof

• US 10,234,351 B2
• Filed: 02/29/2016
• Issued: 03/19/2019
• Est. Priority Date: 09/24/2015
• 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: Yang, Jiuxia, Qiu, Yun, Wang, Zhidong
• Primary Examiner(s): Ha, Nguyen Q.
• Application Number:
  US15/314,467
• Publication Number:
  US 20170284883A1
• Time in Patent Office: 1,114 Days
• CPC Class Codes: G01L 19/083 electrical
• CPC Class Codes: G01L 9/0072 using variations in capacitance
• CPC Class Codes: G01L 9/08 by making use of piezoelectric devices , i.e. electric circuits therefor
• CPC Class Codes: G01L 9/12 by making use of variations in capacitance , i.e. electric circuits therefor
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/805 Electrodes
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers

Abstract

Embodiments of the present invention provide a display substrate, a display device, a pressure detection system and a detection method thereof, which relate to the field of display technologies and is able to integrate the ambient pressure testing function in the display substrate for the convenience of being carried by people when going out, wherein the display substrate comprises a base substrate and a pressure sensing structure located on the base substrate configured to test the ambient pressure. The pressure sensing structure comprises a first pressure sensitive electrode and a second pressure sensitive electrode arranged opposite to each other, and a plurality of insulating pillars arranged at intervals between the first pressure sensitive electrode and the second pressure sensitive electrode, wherein the first pressure sensitive electrode is in contact with the base substrate.

Claims

1. A display substrate integrated in a display panel, comprising a base substrate, wherein

the display substrate further comprises a pressure sensing structure located on the base substrate configured to test an ambient pressure, the pressure sensing structure comprising a first pressure sensitive electrode and a second pressure sensitive electrode arranged opposite to each other, and a plurality of insulating pillars arranged at intervals between the first pressure sensitive electrode and the second pressure sensitive electrode,

wherein the first pressure sensitive electrode is in contact with the base substrate,

wherein each of the plurality of insulating pillars has a first end and a second end opposite to each other, the first end is directly in contact with the first pressure sensitive electrode, and the second end is directly in contact with the second pressure sensitive electrode.

2. The display substrate according to claim 1, wherein the display substrate is a color film substrate and further comprises a color film layer and a black matrix located on the base substrate;

the pressure sensing structure is located between the base substrate and at least one of the color film layer or black matrix.

3. The display substrate according to claim 2, wherein the display substrate further comprises a common electrode layer located at one side of the color film layer and the black matrix away from the base substrate;

an insulating layer is provided between the second pressure sensitive electrode and at least one of the color film layer, the black matrix or the common electrode layer.

4. The display substrate according to claim 1, wherein the display substrate is a color film substrate and further comprises a color film layer composed of a first color pattern, a second color pattern and a third color pattern;

the display substrate comprises a display area and a non-display area located in the periphery of the display area;

the pressure sensing structure is located in the non-display area.

5. The display substrate according to claim 4, wherein the display substrate further comprises a black matrix, the insulating pillar and the black matrix having a same material, and being located in a same layer or formed by using a same patterning process.

6. The display substrate according to claim 5, wherein the display substrate further comprises a common electrode layer located above the second pressure sensitive electrode and the color film layer, and there are materials between the common electrode layer and the second pressure sensitive electrode, which materials compose at least one of the first color pattern, the second color pattern or the third color pattern.

7. The display substrate according to claim 4, wherein

the display substrate further comprises a common electrode layer, the second pressure sensitive electrode and the common electrode layer having a same material, and being located in a same layer or formed by using a same patterning process;

the insulating pillar is formed by successively superposing materials that compose at least one of the first color pattern, the second color pattern, the third color pattern or the black matrix.

8. The display substrate according to claim 1, wherein the display substrate is an array substrate, the base substrate is provided with a thin film transistor array, the thin film transistor is a top gate type transistor, and a metal light-shielding layer and a buffer layer covering the metal light-shielding layer are arranged between the thin film transistor and the base substrate;

the first pressure sensitive electrode and the metal light-shielding layer have a same material, and are located in a same layer or formed by using a same patterning process;

the insulating pillar and the buffer layer have a same material, and are located in a same layer or formed by using a same patterning process.

9. The display substrate according to claim 8, wherein each thin film transistor in the thin film transistor array corresponds to one pixel unit, and the pressure sensing structure is located in an area to which the pixel unit corresponds or located in an area outside the area to which the pixel unit corresponds.

10. The display substrate according to claim 9, wherein one pressure sensing structure is provided for a plurality of pixel units.

11. The display substrate according to claim 1, wherein

the display substrate is an array substrate, the base substrate is provided with a thin film transistor array, the thin film transistor is a bottom gate type transistor, the first pressure sensitive electrode and a gate of the thin film transistor have a same material, and are located in a same layer or formed by using a same patterning process, and the insulating pillar and a gate insulating layer covering the gate have a same material, and are located in a same layer or formed by using a same patterning process.

12. The display substrate according to claim 11, wherein each thin film transistor in the thin film transistor array corresponds to one pixel unit, and the pressure sensing structure is located in an area to which the pixel unit corresponds or located in an area outside the area to which the pixel unit corresponds.

13. The display substrate according to claim 12, wherein one pressure sensing structure is provided for a plurality of pixel units.

14. The display substrate according to claim 1, wherein the display substrate is used for an OLED display panel and comprises an electrode insulating layer arranged at one side of the second pressure sensitive electrode away from the base substrate, the second pressure sensitive electrode is in contact with the electrode insulating layer, and one side of the electrode insulating layer away from the base substrate is provided with an OLED light-emitting element.

15. The display substrate according to claim 1, wherein a material that composes the first pressure sensitive electrode or the second pressure sensitive electrode comprises at least one of graphene, carbon nanotubes, nano-silver, indium tin oxide or indium zinc oxide.

16. A display device comprising the display substrate according to claim 1.

17. A pressure detection system comprising the display device according to claim 16, further comprising a pressure signal collector, a data processor;

the pressure signal collector being connected to the first pressure sensitive electrode, the second pressure sensitive electrode in the pressure sensing structure of the display device and the data processor, and being configured to collect a capacitance value between the first pressure sensitive electrode and the second pressure sensitive electrode and output a collection result to the data processor;

the data processor being further connected to the display device, and being configured to convert the capacitance value collected by the pressure signal collector into a pressure value and output it to the display device such that the display device displays the pressure value.

18. The pressure detection system according to claim 17, further comprising a memory and a comparator;

the comparator being connected to the data processor, the memory and the display device, and being configured to receive the pressure value outputted by the data processor and compare the pressure value with a pressure threshold stored in the memory, and when the pressure value outputted by the data processor is greater than the pressure threshold, send a prompt signal to the display device such that that the display device displays a prompt message according to the prompt signal.

19. A method of detecting a pressure using the display device of claim 16, the method comprising:

collecting a capacitance value between a first pressure sensitive electrode and a second pressure sensitive electrode in the display device;

converting the capacitance value into a pressure value;

displaying the pressure value on said display device.

20. The method according to claim 19, further comprising:

comparing the pressure value with a pressure threshold, and when the pressure value is greater than the pressure threshold, sending a prompt signal to the display device such that the display device displays a prompt message according to the prompt signal.