Pressure-sensing touch system and method and display system

• US 9,965,078 B2
• Filed: 06/22/2016
• Issued: 05/08/2018
• Est. Priority Date: 03/03/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Xu, Zhiqiang, Zou, Xiangxiang, Wang, Xuefei
• Primary Examiner(s): BALAOING, ARIEL A
• Application Number:
  US15/533,079
• Publication Number:
  US 20180052555A1
• Time in Patent Office: 685 Days
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A pressure-sensing touch system for recognition of a touch event caused by a pressure applied at a touch position is disclosed which includes a light guide plate, a light output plate, a light source subsystem, a plurality of interference plates, a plurality of detectors and a controller. Upon application of the pressure at the touch position, a change in an intensity distribution of output light exiting from two through-openings of the interference plate occurs. The plurality of detectors are configured to detect the change. The controller is configured to recognize the touch event based on the detecting by the plurality of detectors. Also disclosed are a pressure-sensing touch method and a display system.

Claims

1. A pressure-sensing touch system for recognition of a touch event caused by a pressure applied at a touch position, comprising:

a light guide plate having an upper surface, a lower surface and at least one light incident surface;

a light output plate arranged at the lower surface and having a plurality of first through-openings in a thickness direction thereof, wherein the light guide plate and the light output plate are bendable upon application of the pressure at the touch position;

a light source subsystem arranged at the at least one light incident surface and configured to direct light into the light guide plate to provide output light via the plurality of through-openings;

a plurality of interference plates each having two second through-openings in a thickness direction thereof, wherein each of the plurality of interference plates is arranged opposite to a respective one of the plurality of first through-openings such that at least part of the output light exiting from the respective first through-opening passes through the two second through-openings to interfere with each other, and wherein the plurality of interference plates are arranged such that bending of the light guide plate and the light output plate causes a change in a position of a corresponding one of the interference plates upon application of the pressure at the touch position;

a plurality of detectors each arranged opposite to a respective one of the plurality of interference plates for receipt of the at least part of the output light exiting from the two through-openings of the respective interference plate, wherein each of the plurality of detectors is configured to detect a change in an intensity distribution of the output light, the change in the intensity distribution being caused by the change in the position of the interference plate corresponding to the detector, the change in the position of the interference plate comprising a decrease in a distance from the interference plate to the detector; and

a controller operably connected to the plurality of detectors and configured to recognize the touch event based on the detecting by the plurality of detectors.

2. The pressure-sensing touch system of claim 1, wherein the first through-openings and the second through-openings are through-holes.

3. The pressure-sensing touch system of claim 1, wherein the first through-openings and the second through-openings are slits.

4. The pressure-sensing touch system of claim 1, wherein the plurality of interference plates are incorporated into an integral structure.

5. The pressure-sensing touch system of claim 1, wherein the plurality of detectors are incorporated into an integral structure.

6. The pressure-sensing touch system of claim 1, wherein the plurality of detectors are arranged in an array.

7. The pressure-sensing touch system of claim 1, wherein each of the plurality of detectors comprises a CMOS or CCD array.

8. The pressure-sensing touch system of claim 1, wherein the light source subsystem comprises at least one light source.

9. The pressure-sensing touch system of claim 8, wherein the at least one light source is selected from the group consisting of an LED, a laser diode and a VCSEL.

10. The pressure-sensing touch system of claim 1, wherein the controller is further configured to recognize the touch position based on from which detector or detectors the change in the intensity distribution is detected.

11. The pressure-sensing touch system of claim 1, wherein the controller is further configured to recognize a level of the pressure based on a magnitude of the change in the intensity distribution.

12. A display system comprising:

a pressure-sensing touch system of claim 1; and

a display panel arranged on the light guide plate,

wherein the touch event is caused by a pressure applied at a touch position on the display panel.

13. The display system of claim 12, wherein the light output plate is a reflector plate.

14. The display system of claim 12, further comprising a diffuser plate arranged between the upper surface of the light guide plate and the display panel.

16. A display system comprising:

a pressure-sensing touch system of claim 2; and

a display panel arranged on the light guide plate,

wherein the touch event is caused by a pressure applied at a touch position on the display panel.

17. A display system comprising:

a pressure-sensing touch system of claim 3; and

a display panel arranged on the light guide plate,

wherein the touch event is caused by a pressure applied at a touch position on the display panel.

18. A display system comprising:

a pressure-sensing touch system of claim 3; and

a display panel arranged on the light guide plate,

wherein the touch event is caused by a pressure applied at a touch position on the display panel.

19. A display system comprising:

a pressure-sensing touch system of claim 4; and

a display panel arranged on the light guide plate,

wherein the touch event is caused by a pressure applied at a touch position on the display panel.

15. A method of recognizing a touch event caused by a pressure applied at a touch position, comprising:

providing output light at a plurality of first through-openings of a light output plate, wherein the light output plate is bendable upon application of the pressure at the touch position;

providing a plurality of interference plates, wherein each of the interference plates has two second through-openings in a thickness direction thereof and is arranged opposite to a respective one of the plurality of first through-openings such that at least part of the output light exiting from the respective first through-opening passes through the two second through-openings to interfere with each other;

bending the light output plate by applying the pressure at the touch position, thereby causing a change in a position of a corresponding one of the interference plates;

detecting, by a detector, a change in an intensity distribution of the output light exiting from the two through-openings of the corresponding interference plate, the change in the intensity distribution being caused by the change in the position of the corresponding interference plate, the change in the position of the corresponding interference plate comprising a decrease in a distance from the interference plate to the detector; and

recognizing the touch event based on the detected change in the intensity distribution.

20. A pressure-sensing touch panel comprising:

a light guide plate having an upper surface, a lower surface and at least one light incident surface;

a light output plate arranged at the lower surface and having a plurality of first through-openings in a thickness direction thereof, wherein the light guide plate and the light output plate are bendable upon application of a pressure at a touch position on the touch panel;

a light source subsystem arranged at the at least one light incident surface and configured to direct light into the light guide plate to provide output light via the plurality of through-openings;

a plurality of interference plates each having two second through-openings in a thickness direction thereof, wherein each of the plurality of interference plates is arranged opposite to a respective one of the plurality of first through-openings such that at least part of the output light exiting from the respective first through-opening passes through the two second through-openings to interfere with each other, and wherein the plurality of interference plates are arranged such that bending of the light guide plate and the light output plate causes a change in a position of a corresponding one of the interference plates upon application of the pressure at the touch position; and

a plurality of detectors each arranged opposite to a respective one of the plurality of interference plates for receipt of the at least part of the output light exiting from the two through-openings of the respective interference plate, wherein each of the plurality of detectors is configured to detect a change in an intensity distribution of the output light, the change in the intensity distribution being caused by the change in the position of the interference plate corresponding to the detector, the change in the position of the interference plate comprising a decrease in a distance from the interference plate to the detector.