# US 12,225,749 B2 · Display panel and display apparatus

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- Number: US 12,225,749 B2
- Document ID: US12225749B2
- Status: Granted
- Kind: B2
- Application number: 17/526,347
- Filed: 2021-11-15
- Published: 2022-03-10
- Granted: 2025-02-11
- Earliest claimed: 2019-10-24
- Assignees: KunShan Go-Visionox Opto-Electronics Co., Ltd
- Applicants: Kunshan Go-Visionox Opto-Electronics Co., Ltd
- Inventors: Jingwen Tian; Bing Wang; Yin Zhang
- Web page: https://patentgrep.com/patent/US12225749B2

## CPC

- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 50/167: {between the light-emitting layer and the anode}
- H10K 50/181: {Electron blocking layers}
- H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display panel and a display apparatus. The display panel includes a blue light-emitting device, and the blue light-emitting device includes a first electrode, an electron blocking layer, a light-emitting layer and a second electrode which are stacked. The hole mobility of the electron blocking layer is not greater than 5×10−4 cm2/VS, so that electrons and holes in the light-emitting layer tend to be balanced, and luminous efficiency of the blue light-emitting device under the low luminance is improved.

## Claims

### Claim 1

A display panel, comprising:
a blue light-emitting device,
wherein the blue light-emitting device comprises a first electrode, an electron blocking layer, a light-emitting layer and a second electrode which are stacked; and
wherein hole mobility of the electron blocking layer is not greater than 5×10−4 cm2/VS, the electron blocking layer comprises a biased electron-type material, and a mass ratio of the biased electron-type material to the electron blocking layer is 1:20 to 1:5.

### Claim 2 (depends on 1)

The display panel of claim 1, wherein a range of a thickness of the electron blocking layer is 3 to 20 nm.

### Claim 3 (depends on 2)

The display panel of claim 2, wherein a thickness of the electron blocking layer is 5 nm.

### Claim 4 (depends on 1)

The display panel of claim 1, wherein the material of the electron blocking layer is at least one of BPD or TDATA: R=H.

### Claim 5 (depends on 1)

The display panel of claim 1, wherein the biased electron-type material is at least one of PBD, 2PSP or OXD-7.

### Claim 6 (depends on 1)

The display panel of claim 1, wherein a range of the hole mobility of the electron blocking layer is 1×10−8 to 5×10−4 cm2/VS.

### Claim 7 (depends on 6)

The display panel of claim 6, wherein the hole mobility of the electron blocking layer is 5.5×10−7 cm2/VS.

### Claim 8 (depends on 1)

The display panel of claim 1, wherein the blue light-emitting device further comprises a plurality of electron-transport layers, and lowest unoccupied molecular orbital energy levels of the plurality of electron-transport layers increase sequentially in a direction in which the second electrode points to the light-emitting layer.

### Claim 9 (depends on 1)

The display panel of claim 1, wherein a difference value between a lowest unoccupied molecular orbital energy level of the electron-transport layer and a lowest unoccupied molecular orbital energy level of the light-emitting layer is greater than 0.2 eV.

### Claim 10 (depends on 1)

The display panel of claim 1, wherein the first electrode is an anode, which is configured to inject electrons into the blue light-emitting device in a case where the blue light-emitting device emits light.

### Claim 11 (depends on 1)

The display panel of claim 1, wherein the second electrode is a cathode, which is configured to inject holes into the blue light-emitting device in a case where the blue light-emitting device emits light.

### Claim 12 (depends on 1)

The display panel of claim 1, wherein the light-emitting layer is an organic light-emitting layer.

### Claim 13 (depends on 1)

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

### Claim 14 (depends on 13)

The display apparatus of claim 13, wherein the display apparatus is a mobile phone, a table PC or a wearable device.

### Claim 15 (depends on 13)

The display apparatus of claim 13, wherein a range of a thickness of the electron blocking layer is 3 to 20 nm.

### Claim 16 (depends on 15)

The display apparatus of claim 15, wherein a thickness of the electron blocking layer is 5 nm.

### Claim 17 (depends on 13)

The display apparatus of claim 13, wherein the material of the electron blocking layer is at least one of BPD or TDATA: R=H.

### Claim 18 (depends on 13)

The display apparatus of claim 13, wherein the biased electron-type material is at least one of PBD, 2PSP or OXD-7.