# US 10,768,737 B2 · Display panel, method for manufacturing the same and display device

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- Number: US 10,768,737 B2
- Document ID: US10768737B2
- Status: Granted
- Kind: B2
- Application number: 15/552,154
- Filed: 2017-02-03
- Published: 2018-11-08
- Granted: 2020-09-08
- Earliest claimed: 2016-06-03
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Yuzhen Guo; Xue Dong; Haisheng Wang; Chun Wei Wu; Yingming Liu; Changfeng Li; Yanan Jia; Xiaoliang Ding
- Web page: https://patentgrep.com/patent/US10768737B2

## CPC

- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G02F 1/133305: {Flexible substrates, e.g. plastics, organic film}
- G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels}
- G02F 1/13338: {Input devices, e.g. touch panels}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/04144: {using an array of force sensing means (position sensing using the local deformation of sensor cells G06F3/0447)}
- G02F 1/133394: {Piezoelectric elements associated with the cells}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- 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 disclosure relates to a display panel, a method for manufacturing the same and a display device. The display panel includes: a substrate; pixel units; and a force sensing array, the force sensing array comprises lower leads, lower sensing electrodes, a piezoelectric layer, upper sensing electrodes and upper leads; wherein lower sensing electrodes and upper sensing electrodes are aligned with each other one by one, and arranged in an array, and each of lower sensing electrodes and each of upper sensing electrodes form a force sensing unit with the piezoelectric layer therebetween; and wherein each of the plurality of lower leads and each column of the force sensing units are aligned with each other one by one, and each of the plurality of upper leads and each row of the force sensing units are also aligned with each other one by one.

## Claims

### Claim 1

A display panel, comprising:
a substrate;
a plurality of pixel units provided on the substrate and arranged in an array; and
a force sensing array provided above, below or within the plurality of pixel units in a direction of a thickness of the display panel,
wherein the force sensing array comprises a plurality of lower leads, a plurality of lower sensing electrodes, a piezoelectric layer, a plurality of upper sensing electrodes and a plurality of upper leads, which are laminated sequentially;
wherein the plurality of lower sensing electrodes and the plurality of upper sensing electrodes are aligned with each other one by one respectively, and arranged in an array respectively, and each of the plurality of lower sensing electrodes and each of the plurality of upper sensing electrodes form a force sensing unit with the piezoelectric layer sandwiched therebetween; and
wherein each of the plurality of lower leads and each column of the force sensing units are aligned with each other one by one, and each of the plurality of upper leads and each row of the force sensing units are also aligned with each other one by one; or, each of the plurality of lower leads and each row of the force sensing unit are aligned with each other one by one and each of the plurality of upper leads and each column of the force sensing units are also aligned with each other one by one.

### Claim 2 (depends on 1)

The display panel according to claim 1, wherein the plurality of lower sensing electrodes and the plurality of upper sensing electrodes respectively form a pattern of grid in which opening areas of the plurality of pixel units are aligned with meshes thereof, in case that force sensing array is provided on a display side of the plurality of pixel units; or the plurality of lower sensing electrodes and the plurality of upper sensing electrodes respectively form a pattern of blocks, in case that the plurality of lower sensing electrodes and the plurality of upper sensing electrodes are made of a transparent conductive material.

### Claim 3 (depends on 2)

The display panel according to claim 2, wherein the piezoelectric layer forms a pattern of grid in which opening areas of the plurality of pixel units are aligned with meshes thereof, and a grid line width of a grid structure of the piezoelectric layer is larger than that of a grid structure of the lower sensing electrodes.

### Claim 4 (depends on 2)

The display panel according to claim 2, wherein the piezoelectric layer is made of transparent piezoelectric ceramic and is of an integral layer construction.

### Claim 5 (depends on 1)

The display panel according to claim 1, wherein both the plurality of lower sensing electrodes and the plurality of upper sensing electrodes form a pattern of blocks and the piezoelectric layer is of an integral layer construction, in case that the force sensing array is provided on a side of the plurality of pixel units opposite to the display side thereof.

### Claim 6 (depends on 1)

The display panel according to claim 1, wherein an elastic spacer layer and a flexible film covering the elastic spacer layer are provided between the force sensing array and the plurality of pixel units, in case that the force sensing array is provided below the plurality of pixel units.

### Claim 7 (depends on 1)

The display panel according to claim 1, wherein the lower sensing electrodes and the upper sensing electrodes are made of an organic conductive material.

### Claim 8 (depends on 7)

The display panel according to claim 7, wherein the lower sensing electrodes and the upper sensing electrodes are made of PEDOT.

### Claim 9 (depends on 1)

The display panel according to claim 1, wherein the lower leads and the upper leads are made of an inorganic conductive material.

### Claim 10 (depends on 9)

The display panel according to claim 9, wherein the lower leads and the upper leads are made of silver or ITO.

### Claim 11 (depends on 1)

The display panel according to claim 1, wherein the piezoelectric layer is made of lead zirconate titanate piezoelectric ceramics.

### Claim 12 (depends on 1)

The display panel according to claim 1, wherein the display panel is a flexible display panel.

### Claim 13 (depends on 12)

The display panel according to claim 12, wherein the force sensing array is at least provided in a frame area of the flexible display panel.

### Claim 14 (depends on 1)

The display panel according to claim 1, wherein the display panel is one of a liquid crystal display panel, an electroluminescent display panel, a plasma display panel and an electronic paper.

### Claim 15 (depends on 14)

The display panel according to claim 14, wherein the force sensing array is provided above the plurality of pixel units and specifically provided on an encapsulation film of the plurality of pixel units, in case that the display panel is the electroluminescent display panel.

### Claim 16 (depends on 14)

The display panel according to claim 14, wherein the force sensing array is provided within the plurality of pixel units and specifically provided on a film between light emitting components and pixel circuits of the plurality of pixel units, in case that the display panel is the electroluminescent display panel.

### Claim 17 (depends on 1)

A display device comprising the display panel according to claim 1.

### Claim 18 (depends on 1)

A method for manufacturing the display panel according to claim 1, comprising steps:
forming patterns of the plurality of lower leads, the plurality of lower sensing electrodes, the piezoelectric layer, the plurality of upper sensing electrodes and the plurality of upper leads sequentially by a solution process, before, after or during forming the plurality of pixel units arranged in an array on the substrate, such that the force sensing array is provided above, below or within the plurality of pixel units in a direction of a thickness of the display panel.

### Claim 19 (depends on 18)

The method according to claim 18, wherein the step of forming patterns of the plurality of lower leads, the plurality of lower sensing electrodes, the piezoelectric layer, the plurality of upper sensing electrodes and the plurality of upper leads sequentially by a solution process specifically comprises:
forming patterns of the plurality of lower leads, the plurality of lower sensing electrodes, the piezoelectric layer, the plurality of upper sensing electrodes and the plurality of upper leads sequentially by ink-jet printing or screen printing.