PRESSURE DETECTION STRUCTURE AND TOUCH DEVICE

• US 20170269758A1
• Filed: 06/05/2017
• Published: 09/21/2017
• Est. Priority Date: 10/29/2015
• Status: Active Grant

• Current Assignee: Shenzhen Goodix Technology Co., Ltd.
• Original Assignee: Shenzhen Goodix Technology Co., Ltd.
• Inventors: WEN, Dafei, LIU, Wu, RAN, Rui
• Granted Patent: US 10,338,720 B2
• Time in Patent Office: Days
• CPC Class Codes: G01L 1/146 for measuring force distributions, e.g. using force arrays G01L1/148 takes precedence
• CPC Class Codes: G01L 1/205 using distributed sensing elements
• CPC Class Codes: G06F 1/1643 the display being associated to a digitizer, e.g. laptops that can be used as penpads details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615
• 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 3/0412 Digitisers structurally integrated in a display
• 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 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A pressure detection structure and a touch device are disclosed. The structure is mounted on a middle frame of the touch device and includes a cover, a display device and a pressure sensor. The display device is arranged below the cover, and includes a display module. The pressure sensor is arranged in the display device; any electrically conductive member in the display device or the middle frame which is electrically conductive is used as a reference electrode; and a variable gap is present between the pressure sensor and the reference electrode, and the pressure sensor outputs a pressure signal according to variation of capacitance between a sensing electrode thereof and the reference electrode. According to the present application, pressure detection may be carried out accurately, and thus reliability of products is enhanced.

Claims

1. A pressure detection structure being mounted on a middle frame of a touch device, and comprising:

a cover;

a display device being arranged below the cover, wherein the display device comprises a display module;

a pressure sensor comprising a sensing electrode arranged in the display device; and

a reference electrode being an electrically conductive member in the display device or the middle frame which is electrically conductive;

wherein a variable gap is present between the pressure sensor and the reference electrode, and the pressure sensor is configured to output a pressure signal according to variation of capacitance between the sensing electrode and the reference electrode.

2. The pressure detection structure according to claim 1, wherein the pressure sensor is disposed on a surface of a lower glass or an upper glass of the display module;

and

the display device is an LCD display device or an LED display device, the reference electrode is the middle frame which is electrically conductive;

or

the display device is an LCD display device, the reference electrode is an electrically conductive member of optical members comprised in the display device, or the reference electrode is an electrically conductive back shell of a housing of the display device.

3. The pressure detection structure according to claim 2, wherein the pressure sensor is disposed on one of an upper surface of the lower glass of the display module, an upper surface of the upper glass, and a lower surface of the upper glass, and the pressure sensor is a driving electrode of the display module.

4. The pressure detection structure according to claim 1, wherein a shielding electrode for shielding interference from an external reference plane is arranged in the display device;

and

a capacitance between the pressure sensor and the shielding electrode is constant.

5. The pressure detection structure according to claim 4, wherein the shielding electrode is an electrically conductive member arranged above the pressure sensor.

6. The pressure detection structure according to claim 1, wherein the display device is an LCD display device, the display device comprises a housing of the display module, wherein the housing comprises a back shell and a support connected to an edge of the back shell, and the pressure sensor is disposed above the back shell;

and

no variable gap is present between the pressure sensor and the back shell, and the reference electrode is an electrically conductive member arranged above the back shell;

or

a variable gap is present between the pressure sensor and the back shell, the reference electrode is an electrically conductive member arranged above the back shell or the back shell which is electrically conductive.

7. The pressure detection structure according to claim 6, wherein a reinforcing step is arranged on a bottom of the back shell or on an inner wall of the support, wherein the reinforcing step causes another gap between the pressure sensor and the reference electrode.

8. The pressure detection structure according to claim 6, wherein no variable gap is present between the pressure sensor and the back shell, the back shell is an electrically conductive member, and the electrically conductive back shell is used as a shielding electrode to shield interference caused by an external reference plane to a capacitance between the pressure sensor and the reference electrode.

9. The pressure detection structure according to claim 6, wherein the variable gap is present between the pressure sensor and the back shell, a shielding electrode for shielding interference from an external reference plane is arranged in the display device;

and

a capacitance between the pressure sensor and the shielding electrode is constant.

10. The pressure detection structure according to claim 9, wherein the shielding electrode is disposed in the display device, and the shielding electrode is an electrically conductive member arranged above the pressure sensor.

11. The pressure detection structure according to claim 10, wherein a cushion is arranged between the back shell and the middle frame.

12. The pressure detection structure according to claim 1, wherein the display device is an LCD display device, the pressure sensor is disposed on a surface of the optical members of the display device;

and

the reference electrode is the middle frame which is electrically conductive of the touch device;

or

the reference electrode is an electrically conductive member in the display module;

or

the reference electrode is an electrically conductive member of the optical members of the display device;

or

the reference electrode is an electrically conductive back shell of a housing of the display device.

13. The pressure detection structure according to claim 12, wherein a shielding electrode for shielding interference from an external reference plane is arranged in the display device;

and

a capacitance between the pressure sensor and the shielding electrode is constant.

14. The pressure detection structure according to claim 13, wherein the shielding electrode is disposed in the display device, and the shielding electrode is an electrically conductive member arranged above the pressure sensor.

15. A pressure detection structure, comprising:

a cover, a display screen, a pressure sensor; and

a middle frame, the display screen and the cover being sequentially stacked in the middle frame from bottom to top;

wherein the pressure sensor is arranged in the display screen;

the display screen comprises optical members and a liquid crystal module which are sequentially stacked from bottom to top, and a housing bearing the optical members and the liquid crystal module, the housing comprising a back shell and a support connected to an edge of the back shell;

the pressure sensor is disposed between the optical members and the back shell; and

a gap is present inside the display screen.

16. A pressure detection structure being mounted on a middle frame of a touch device, and comprising:

a cover, a display device, a pressure sensor, the display device being arranged below the cover, and the display device comprising a display module;

wherein the pressure sensor is arranged between the cover and the display device;

any electrically conductive member in the display device or the middle frame which is electrically conductive is used as a reference electrode; and

a variable gap is present between the pressure sensor and the reference electrode, and the pressure sensor outputs a pressure signal according to variation of capacitance between a sensing electrode thereof and the reference electrode.

17. The pressure detection structure according to claim 16, wherein

when the display device is an LCD display device or an LED display device, the reference electrode is the electrically conductive middle frame comprised in the touch device;

or

when the display device is an LCD display device, the reference electrode is an electrically conductive member of optical members comprised in the display device;

or

when the display device is an LCD display device, the reference electrode is an electrically conductive back shell comprised in the housing.

18. The pressure detection structure according to claim 17, wherein a shielding electrode for shielding interference from an external reference plane is arranged in the display device;

and

a capacitance between the pressure sensor and the shielding electrode is constant.

19. The pressure detection structure according to claim 18, wherein the shielding electrode is disposed in the display device, and the shielding electrode is an electrically conductive member arranged above the pressure sensor.

20. A touch device, comprising a middle frame and a pressure detection structure mounted on the middle frame, wherein the pressure detection structure comprises:

a cover;

a display device being arranged below the cover, and the display device comprises a display module;

a pressure sensor comprising a sensing electrode arranged in the display device; and

a reference electrode chosen from any one of electrically conductive members in the display device and the middle frame, wherein a variable gap is present between the pressure sensor and the reference electrode, and the pressure sensor outputs a pressure signal according to variation of capacitance between the sensing electrode and the reference electrode.