# US 10,372,252 B2 · Force touch display device

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- Number: US 10,372,252 B2
- Document ID: US10372252B2
- Status: Granted
- Kind: B2
- Application number: 15/122,408
- Filed: 2016-06-27
- Published: 2018-05-31
- Granted: 2019-08-06
- Earliest claimed: 2016-05-26
- Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Inventors: Yaoli Huang; Hongsen Zhang; Xinglong He
- Web page: https://patentgrep.com/patent/US10372252B2

## CPC

- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels}
- G02F 1/133314: {Back frames}
- G02F 1/133317: {Intermediate frames, e.g. between backlight housing and front frame}
- G02F 1/133334: {Electromagnetic shields}
- G02F 1/13338: {Input devices, e.g. touch panels}
- G06F 2203/04107: Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present invention provides a force touch display device, including a liquid crystal display (11), a backlight module (12), a backlight module bottom frame (121), a shield layer (2), a pressure sensor (13) and a middle frame (14). With the shield layer (2) providing a function of shielding an electromagnetic noise signal being used inside the display device, the interference applied on the pressure sense result of the pressure sensor by the electromagnetic noise signal inside the force touch display device is effectively reduced, and thus the force touch sensitivity of the force touch display device is improved.

## Claims

### Claim 1

A force touch display device, comprising a liquid crystal display, a backlight module located under the liquid crystal display, a shield layer located under the backlight module, a backlight module bottom frame located under the shield layer, a pressure sensor located under the backlight module bottom frame, and a middle frame located under the pressure sensor;
wherein the shield layer is a conductive material;
a gap is comprised between the pressure sensor and the backlight module bottom frame so as to form a capacitor between the pressure sensor and the backlight module bottom frame; and
the pressure sensor is sensing a pressure applied on the force touch display device through a capacitance change between the pressure sensor and the backlight module bottom frame, and the shield layer is used to screen an electromagnetic noise signal from the liquid crystal display so as to prevent pressure sensing conducted by the pressure sensor from being interfered with by the electromagnetic noise signal;
wherein the shield layer and the pressure sensor are arranged on opposite sides of the gap so that the shield layer and the pressure sensor are spaced from each other by the gap and wherein the pressure sensor is arranged on the middle frame and the shield layer is arranged on the backlight module bottom frame and is deformable in combination with the backlight module bottom frame in a direction toward the gap to shorten the distance between the pressure sensor and the backlight module bottom frame and cause the capacitance change between the pressure sensor and the backlight module bottom frame.

### Claim 2 (depends on 1)

The force touch display device according to claim 1, wherein the shield layer is an entire sheet of conductive film or is a conductive film with a plurality of hollow pattern.

### Claim 3 (depends on 1)

The force touch display device according to claim 1, wherein a material of the shield layer is a metal;
a material of the backlight module bottom frame is metal; and
a material of the middle frame is metal.