# US 11,309,513 B2 · Anode, light emitting device, display substrate and method of manufacturing the same, and display device

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- Number: US 11,309,513 B2
- Document ID: US11309513B2
- Status: Granted
- Kind: B2
- Application number: 16/760,644
- Filed: 2019-11-04
- Published: 2021-06-03
- Granted: 2022-04-19
- Earliest claimed: 2018-11-06
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Wei Quan
- Web page: https://patentgrep.com/patent/US11309513B2

## CPC

- H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers}
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H10K 2102/3026: {Top emission}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An anode includes at least one first electrode, and a reflecting electrode disposed on a side of the at least one first electrode configured to face a light emitting portion of the light emitting device.

## Claims

### Claim 1

A display substrate, comprising:
a base substrate; and
a plurality of sub-pixels disposed on the base substrate, each sub-pixel including a light emitting device; wherein
the light emitting device includes an anode, a cathode and a light emitting portion disposed between the anode and the cathode; the anode of the light emitting device is closer to the base substrate than the cathode of the light emitting device; the anode includes at least one first electrode and a reflecting electrode disposed on a side of the at least one first electrode configured to face a light emitting portion of the light emitting device; the reflecting electrode in the anode is configured to reflect light emitted by the light emitting portion; the cathode is configured to be light-transmittable;
the plurality of sub-pixels include at least two types of sub-pixels, and each type of sub-pixels is configured to display a color; a distance between the reflecting electrode and the light emitting portion in each sub-pixel for displaying one color is different from a distance between the reflecting electrode and the light emitting portion in each sub-pixel for displaying another color;
the at least two types of sub-pixels include: a red sub-pixel, a green sub-pixel, and a blue sub-pixel; a distance between the reflecting electrode and the light emitting portion in the blue sub-pixel is less than a distance between the reflecting electrode and the light emitting portion in the green sub-pixel; a distance between the reflecting electrode and the light emitting portion in the green sub-pixel is less than a distance between the reflecting electrode and the light emitting portion in the red sub-pixel.

### Claim 2 (depends on 1)

The display substrate according to claim 1, wherein the anode further includes:
at least one second electrode disposed on a side of the reflecting electrode away from the at least one first electrode;
the at least one second electrode is configured to be light-transmittable.

### Claim 3 (depends on 2)

The display substrate according to claim 2, wherein a material of the at least one second electrode includes transparent conductive metal oxide.

### Claim 4 (depends on 2)

The display substrate according to claim 2, wherein
the at least one first electrode includes a plurality of first electrodes disposed in a stack, or
the at least one second electrode includes a plurality of second electrodes disposed in a stack, or
the at least one first electrode includes a plurality of first electrodes disposed in a stack, and the at least one second electrode includes a plurality of second electrodes disposed in a stack.

### Claim 5 (depends on 1)

The display substrate according to claim 1, wherein a material of the at least one first electrode includes at least one of metal or conductive metal oxide; and
a material of the reflecting electrode includes at least one of silver, aluminum or molybdenum.

### Claim 6 (depends on 1)

The display substrate according to claim 1, wherein along a direction that is perpendicular to the base substrate and points to the cathode from the anode of the light emitting device,
in the light emitting device included in the blue sub-pixel, the at least one first electrode includes: blue first electrodes AB1, AB2 and AB3, the reflecting electrode includes a blue reflecting electrode, and the light emitting device further includes a blue second electrode BB1; and the blue first electrodes AB1, AB2 and AB3, the blue reflecting electrode, and the blue second electrode BB1 are disposed on the base substrate in sequence;
in the light emitting device included in the green sub-pixel, the at least one first electrode includes: green first electrodes AG1 and AG2, the reflecting electrode includes a green reflecting electrode, and the light emitting device further includes: green second electrodes BG1 and BG2; and the green first electrodes AG1 and AG2, the green reflecting electrode, and the green second electrodes BG1 and BG2 are disposed on the base substrate in sequence; and
in the light emitting device included in the red sub-pixel the at least one first electrode includes a red first electrode& AR1, the reflecting electrode includes a red reflecting electrode, and the light emitting device further includes: red second electrodes BR1, BR2 and BR3; and the red first electrodes AR1, the red reflecting electrode, and the red second electrodes BR1, BR2 and BR3 are disposed on the base substrate in sequence; wherein
the red first electrode AR1, the green first electrode AG1 and the blue first electrode AB1 are disposed in a same layer; the blue first electrode AB2, the green first electrode AG2 and the red second electrode BR1 are disposed in a same layer; the blue first electrode AB3, the green second electrode BG1 and the red second electrode BR2 are disposed in a same layer; and the blue second electrode BB1, the green second electrode BG2 and the red second electrode BR3 are disposed in a same layer; and
the blue first electrodes AB2 and AB3, the blue second electrode BB1, the green first electrode AG2, the green second electrodes BG1 and BG2, and the red second electrodes BR1, BR2 and BR3 are all configured to be light-transmittable.

### Claim 7 (depends on 1)

The display substrate according to claim 1, wherein the plurality of sub-pixels include at least two types of sub-pixels, and each type of sub-pixels is configured to display a color;
light emitted by the light emitting portion in each sub-pixel for displaying one color and light emitted by the light emitting portion in each sub-pixel for displaying another color are different in color; or,
light emitting portions in the sub-pixels for displaying different colors are all white light emitting portions, each sub-pixel further includes a color filter portion disposed above a side of the light emitting device away from the base substrate, and the color filter portion in each sub-pixel for displaying one color and the color filter portion in each sub-pixel for displaying another color are different in color.

### Claim 8 (depends on 1)

A display device, comprising the display substrate according to claim 1.

### Claim 9 (depends on 1)

The display substrate according to claim 1, wherein an orthographic projection of the reflecting electrode on a reference plane is at least partially overlapped with an orthographic projection of the light emitting portion on the reference plane, the reference plane being parallel to a surface of the at least one first electrode configured to face the light emitting portion.

### Claim 10

A method of manufacturing a display substrate, comprising:
providing a base substrate;
forming a plurality of anodes on a side of the base substrate; and
forming a plurality of light emitting portions on sides of the plurality of anodes away from the base substrate, respectively; wherein
forming the plurality of anodes on the side of the base substrate, includes:
forming at least one electrode layer on a side of the base substrate, each electrode layer including a plurality of first electrodes; and
forming a first reflecting electrode layer on a side of the at least one electrode layer away from the base substrate, the first reflecting electrode layer including at least one first reflecting electrode, an orthographic projection of one first reflecting electrode on the base substrate being at least partially overlapped with an orthographic projection of a corresponding one of the plurality of light emitting portions on the base substrate; wherein
forming the plurality of anodes on the side of the base substrate, further includes:
forming at least one first light-transmitting electrode layer on the base substrate with the at least one electrode layer and the first reflecting electrode layer formed thereon, each first light-transmitting electrode layer including a plurality of first light-transmitting electrodes, an orthographic projection of each of the plurality of first light-transmitting electrodes on the base substrate being at least partially overlapped with an orthographic projection of a corresponding one of the plurality of first electrodes on the base substrate.

### Claim 11 (depends on 10)

The method according to claim 10, wherein forming the plurality of anodes on the side of the base substrate, further includes:
forming a second reflecting electrode layer on a side of the at least one first light-transmitting electrode layer away from the base substrate, the second reflecting electrode layer including at least one second reflecting electrode, an orthographic projection of one second reflecting electrode on the base substrate being at least partially overlapped with an orthographic projection of a corresponding one of the plurality of light emitting portions on the base substrate, and an orthographic projection of each second reflecting electrode on the base substrate being not overlapped with an orthographic projection of any one first reflecting electrode on the base substrate; and
forming at least one second light-transmitting electrode layer on a side of the second reflecting electrode layer away from the base substrate, each second light-transmitting electrode layer including a plurality of second light-transmitting electrodes, an orthographic projection of each of the plurality of second light-transmitting electrodes on the base substrate being at least partially overlapped with an orthographic projection of a corresponding one of the plurality of first electrodes on the base substrate.

### Claim 12 (depends on 11)

The method according to claim 11, wherein forming the plurality of anodes on the side of the base substrate, further includes:
forming a third reflecting electrode layer on a side of the at least one second light-transmitting electrode layer away from the base substrate, the third reflecting electrode layer including at least one third reflecting electrode, an orthographic projection of one third reflecting electrode on the base substrate being at least partially overlapped with an orthographic projection of a corresponding one of the plurality of light emitting portions on the base substrate, and an orthographic projection of each third reflecting electrode on the base substrate being not overlapped with the orthographic projections of any one first reflecting electrode and any one second reflecting electrode on the base substrate; and
forming at least one third light-transmitting electrode layer on a side of the third reflecting electrode layer away from the base substrate, each third light-transmitting electrode layer including a plurality of third light-transmitting electrodes, an orthographic projection of each of the plurality of third light-transmitting electrodes on the base substrate being at least partially overlapped with an orthographic projection of a corresponding one of the plurality of first electrodes on the base substrate.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the base substrate includes at least one red sub-pixel region, at least one green sub-pixel region and at least one blue sub-pixel region, each red sub-pixel region being configured to be provided with a red sub-pixel, each green sub-pixel region being configured to be provided with a green sub-pixel, each blue sub-pixel region being configured to be provided with a blue sub-pixel; wherein
the at least one first reflecting electrode is disposed in the at least one red sub-pixel region, respectively;
the at least one second reflecting electrode is disposed in the at least one green sub-pixel region, respectively; and
the at least one third reflecting electrode is disposed in the at least one blue sub-pixel region, respectively.

### Claim 14 (depends on 12)

The method according to claim 12, wherein the at least one electrode layer, the at least one first light-transmitting electrode layer, the at least one second light-transmitting electrode layer and the at least one third light-transmitting electrode layer are formed by sputtering.

### Claim 15 (depends on 12)

The method according to claim 12, wherein the first reflecting electrode layer, the second reflecting electrode layer and the third reflecting electrode layer are formed by printing or sputtering.