# US 11,114,639 B2 · Flexible display panel, fabricating method thereof and display apparatus

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- Number: US 11,114,639 B2
- Document ID: US11114639B2
- Status: Granted
- Kind: B2
- Application number: 16/466,241
- Filed: 2018-12-11
- Published: 2020-10-29
- Granted: 2021-09-07
- Earliest claimed: 2018-01-15
- Assignees: Hefeixinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Hefei Xinsheng Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Suwei Zeng; Jie Pan
- Web page: https://patentgrep.com/patent/US11114639B2

## CPC

- H10K 59/875: {Arrangements for extracting light from the devices}
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/171: {Electron injection layers}
- H10K 77/111: {Flexible substrates}
- H10K 59/50: OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present disclosure provides a flexible OLED display panel, a fabricating method thereof and a display apparatus. The flexible display panel includes a light emitting display unit including a display light emitting device, and a controllable deformation unit including a control light emitting device and a photo-deformable layer disposed in a light emitting direction of the control light emitting device, the photo-deformable layer configured to deform under illumination of the control light emitting device. An optical path of the control light emitting device and an optical path of the display light emitting device do not coincide with each other. Since the optical path of the control light emitting device and the optical path of the display light emitting device do not coincide with each other, crosstalk between display light and control light is prevented, and the display quality is improved.

## Claims

### Claim 1

A flexible display panel, comprising:
a light emitting display unit comprising a display light emitting device; and
a controllable deformation unit comprising a control light emitting device and a photo-deformable layer in a light emitting direction of the control light emitting device,
wherein the photo-deformable layer is configured to deform under illumination of the control light emitting device; and
wherein an optical path of the control light emitting device and an optical path of the display light emitting device do not coincide with each other.

### Claim 2 (depends on 1)

The flexible display panel of claim 1, further comprising:
an encapsulation layer between the light emitting display unit and the controllable deformation unit;
wherein the display light emitting device comprises a first transparent flexible substrate,
wherein a first reflective cathode, a display light emitting layer, and a first transparent anode are in sequence between the first transparent flexible substrate and the encapsulation layer along a light emitting direction of display light,
wherein the control light emitting device comprises a second transparent flexible substrate,
wherein a second reflective cathode, a control light emitting layer, and a second transparent anode are in sequence between the second transparent flexible substrate and the encapsulation layer along a light emitting direction of control light; and
wherein the first reflective cathode and the second reflective cathode share the encapsulation layer for encapsulation connection.

### Claim 3 (depends on 1)

The flexible display panel of claim 1, further comprising:
a transparent flexible substrate; and
an encapsulation layer,
wherein the display light emitting device comprises a first reflective cathode,
wherein a display light emitting layer and a first transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light emitting direction of display light,
wherein the control light emitting device comprises a second reflective cathode,
wherein a control light emitting layer, and a second transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light exiting direction of control light,
wherein a plurality of light emitting display units comprising the light emitting display unit and a plurality of controllable deformation units comprising the controllable deformation unit are arranged in an array and share the transparent flexible substrate and the encapsulation layer,
wherein the first transparent anode and the second reflective cathode are in a same first layer,
wherein the display light emitting layer and the control light emitting layer are in a same second layer, and
wherein the first reflective cathode and the second transparent anode are in a same third layer.

### Claim 4 (depends on 1)

The flexible display panel of claim 1, further comprising:
a transparent flexible substrate; and
an encapsulation layer,
wherein the display light emitting device comprises a first reflective cathode,
wherein a display light emitting layer, and a first transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light emitting direction of display light,
wherein the control light emitting device comprises a second reflective cathode,
wherein a control light emitting layer, and a second transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light exiting direction of control light,
wherein a plurality of light emitting display units comprising the light emitting display unit and a plurality of controllable deformation units comprising the controllable deformation unit are arranged in an array and share the transparent flexible substrate and the encapsulation layer,
wherein the first transparent anode and the second transparent anode are in a same first layer;
wherein the display light emitting layer and the control light emitting layer are in a same second layer;
wherein the first reflective cathode and the second reflective cathode are in a same third layer.

### Claim 5 (depends on 2)

The flexible display panel of claim 2, wherein the display light emitting layer comprises:
a red light emitting layer, a green light emitting layer, and a blue light emitting layer arranged in sequence;
wherein the control light emitting layer comprises a blue light emitting layer.

### Claim 6 (depends on 5)

The flexible display panel of claim 5, wherein at least one of the red light emitting layer, the green light emitting layer, or the blue light emitting layer comprises at least one of a hole injection layer HIL, a hole transport layer HTL, a light emitting layer EML, an electron transport layer ETL, or an electron injection layer EIL.

### Claim 7 (depends on 5)

The flexible display panel of claim 5, wherein the photo-deformable layer comprises a high cross-linked liquid crystal elastomer (LCE) film comprising azobenzene.

### Claim 8 (depends on 2)

The flexible display panel of claim 2,
wherein the photo-deformable layer comprises patterns of a photo-deformable material arranged in an array,
wherein a shape of each pattern of the patterns of the photo-deformable material is a strip, a grid or a plane.

### Claim 9

A method for fabricating a flexible display panel, comprising:
forming a light emitting display unit by forming a display light emitting device; and
forming a controllable deformation unit by forming a control light emitting device and a photo-deformable layer in a light emitting direction of the control light emitting device,
wherein the photo-deformable layer is configured to deform under illumination of the control light emitting device, and
wherein an optical path of the control light emitting device and an optical path of the display light emitting device do not coincide with each other.

### Claim 10 (depends on 9)

The method of claim 9, wherein forming the light emitting display unit comprises:
forming a first transparent anode on a first transparent flexible substrate;
forming a display light emitting layer on the first transparent anode; and
forming a first reflective cathode on the display light emitting layer,
wherein the forming the controllable deformation unit comprises:
forming a second transparent anode on a second transparent flexible substrate;
forming a control light emitting layer on the second transparent anode;
forming a second reflective cathode on the control light emitting layer; and
forming the photo-deformable layer on a side of the second transparent flexible substrate facing away from the control light emitting layer;
forming an encapsulation layer on the first reflective cathode or the second reflective cathode; and
encapsulating the light emitting display unit and the controllable deformation unit by the encapsulation layer.

### Claim 11

A method for fabricating a flexible display panel, comprising:
providing a transparent flexible substrate; and
forming a light emitting display unit by forming a display light emitting device, and forming a controllable deformation unit on a same side of the transparent flexible substrate by forming a control light emitting device and a photo-deformable layer in a light emitting direction of the control light emitting device,
wherein the photo-deformable layer is configured to deform under illumination of the control light emitting device, and
wherein an optical path of the control light emitting device and an optical path of the display light emitting device do not coincide with each other.

### Claim 12 (depends on 11)

The method of claim 11, wherein the forming the light emitting display unit comprises:
forming a first transparent anode of the light emitting display unit and a second reflective cathode of the controllable deformation unit on a same side of the transparent flexible substrate, wherein the first transparent anode and the second reflective cathode are in a same first layer;
forming a display light emitting layer of the light emitting display unit on the first transparent anode, and forming a control light emitting layer of the controllable deformation unit on the second reflective cathode, wherein the display light emitting layer and the control light emitting layer are in a same second layer;
forming a first reflective cathode of the light emitting display unit on the display light emitting layer, and forming a second transparent anode of the controllable deformation unit on the control light emitting layer, wherein the first reflective cathode and the second transparent anode are in a same third layer;
forming an encapsulation layer on the first reflective cathode and the second transparent anode; and
forming the photo-deformable layer on the encapsulation layer.

### Claim 13 (depends on 11)

The method of claim 11, wherein the forming the light emitting display unit comprises:
forming a first transparent anode of the light emitting display unit and a second transparent anode of the controllable deformation unit on a same side of the transparent flexible substrate, wherein the first transparent anode and the second transparent anode are in a same first layer;
forming a display light emitting layer of the light emitting display unit on the first transparent anode, and forming a control light emitting layer of the controllable deformation unit on the second transparent anode, wherein the display light emitting layer and the control light emitting layer are in a same second layer;
forming a first reflective cathode of the light emitting display unit on the display light emitting layer, and forming a second reflective cathode of the controllable deformation unit on the control light emitting layer, wherein the first reflective cathode and the second reflective cathode are in a same third layer;
forming an encapsulation layer on the first reflective cathode and the second reflective cathode; and
forming the photo-deformable layer on the transparent flexible substrate.

### Claim 14 (depends on 13)

The method of claim 13, further comprising:
disposing a light shielding layer on a side of the photo-deformable layer facing away from the transparent flexible substrate.

### Claim 15 (depends on 1)

A flexible display apparatus, comprising the flexible display panel of claim 1.

### Claim 16 (depends on 15)

The flexible display apparatus of claim 15, further comprising:
an encapsulation layer between the light emitting display unit and the controllable deformation unit,
wherein the display light emitting device comprises a first transparent flexible substrate,
wherein a first reflective cathode, a display light emitting layer, and a first transparent anode are in sequence between the first transparent flexible substrate and the encapsulation layer along a light emitting direction of display light,
wherein the control light emitting device comprises a second transparent flexible substrate,
wherein a second reflective cathode, a control light emitting layer, and a second transparent anode are in sequence between the second transparent flexible substrate and the encapsulation layer along a light emitting direction of control light, and
wherein the first reflective cathode and the second reflective cathode share the encapsulation layer for encapsulation connection.

### Claim 17 (depends on 15)

The flexible display apparatus of claim 15, further comprising:
a transparent flexible substrate; and
an encapsulation layer,
wherein the display light emitting device comprises a first reflective cathode,
wherein a display light emitting layer, and a first transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light emitting direction of display light,
wherein the control light emitting device comprises a second reflective cathode,
wherein a control light emitting layer, and a second transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light exiting direction of control light;
wherein a plurality of light emitting display units comprising the light emitting display unit and a plurality of controllable deformation units comprising the controllable deformation unit are arranged in an array and share the transparent flexible substrate and the encapsulation layer,
wherein the first transparent anode and the second reflective cathode are in a same first layer,
wherein the display light emitting layer and the control light emitting layer are in a same second layer, and
wherein the first reflective cathode and the second transparent anode are in a same third layer.

### Claim 18 (depends on 15)

The flexible display apparatus of claim 15, further comprising:
a transparent flexible substrate; and
an encapsulation layer,
wherein the display light emitting device comprises a first reflective cathode,
wherein a display light emitting layer, and a first transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light emitting direction of display light,
wherein the control light emitting device comprises a second reflective cathode,
wherein a control light emitting layer and a second transparent anode are in sequence between the transparent flexible substrate and the encapsulation layer along a light exiting direction of control light,
wherein a plurality of light emitting display units comprising the light emitting display unit and a plurality of controllable deformation units comprising the controllable deformation unit are arranged in an array and share the transparent flexible substrate and the encapsulation layer,
wherein the first transparent anode and the second transparent anode are in a same first layer,
wherein the display light emitting layer and the control light emitting layer are in a same second layer, and
wherein the first reflective cathode and the second reflective cathode are in a same third layer.

### Claim 19 (depends on 16)

The flexible display apparatus of claim 16, wherein the display light emitting layer comprises:
a red light emitting layer, a green light emitting layer, and a blue light emitting layer arranged in sequence,
wherein the control light emitting layer comprises a blue light emitting layer.

### Claim 20 (depends on 19)

The flexible display apparatus of claim 19, wherein at least one of the red light emitting layer, the green light emitting layer, or the blue light emitting layer comprises at least one or more of a hole injection layer HIL, a hole transport layer HTL, a light emitting layer EML, an electron transport layer ETL, or an electron injection layer EIL.