# US 12,190,788 B2 · μ-LED, μ-LED device, display and method for the same

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- Number: US 12,190,788 B2
- Document ID: US12190788B2
- Status: Granted
- Kind: B2
- Application number: 17/515,102
- Filed: 2021-10-29
- Published: 2022-02-17
- Granted: 2025-01-07
- Earliest claimed: 2019-01-29
- Assignees: OSRAM Opto Semiconductors GmbH
- Applicants: OSRAM Opto Semiconductors GmbH
- Inventors: Thorsten Baumheinrich; Peter Brick; Jean-Jacques Drolet; Hubert Halbritter; Laura Kreiner; Jens Richter; Thomas Schwarz; Paul Ta; Kilian Regau; Christopher Soell; Hoa Vu; Christopher Wiesmann; Patrick Hoerner; Jong Park; Kanishk Chand
- Web page: https://patentgrep.com/patent/US12190788B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- B60K 35/22: Display screens
- G09G 3/2077: {by a combination of two or more gradation control methods}
- G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)}
- G09G 5/10: Intensity circuits
- B60K 2360/1523: Matrix displays
- B60K 2360/332: Light emitting diodes
- B60K 2360/349: Adjustment of brightness
- G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update
- G09G 2300/0895: having more than one selection line for a two-terminal active matrix LCD, e.g. Lechner and D2R circuits
- G09G 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
- G09G 2310/06: Details of flat display driving waveforms
- G09G 2320/0633: by amplitude modulation of the brightness of the illumination source
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

Disclosed are various aspects of a μ-LED or a μ-LED array for augmented reality or lighting applications, in particular in the automotive field. The μ-LED is characterized by particularly small dimensions in the range of a few μm.

## Claims

### Claim 1

A display arrangement comprising:
an IC substrate component with monolithic integrated circuits and with IC substrate contacts arranged as a matrix; a monolithic pixelated optochip comprising a semiconductor layer sequence with a first semiconductor layer having a first doping and a second semiconductor layer having a second doping, wherein the polarity of the charge carriers in the first semiconductor layer differs from that of the second semiconductor layer and the semiconductor layer sequence defines a stacking direction;
wherein μ-LEDs arranged as a matrix are present in the monolithic pixelated optochip;
wherein each μ-LED has a μ-LED rear side facing the IC substrate component and a first light source contact which adjoins the first semiconductor layer in a contacting manner and is electrically conductively connected to a respective one of the IC substrate contacts;
wherein the projection area of the first light source contact on the μ-LED rear surface is at most half the area of the μ-LED rear surface;
wherein the first light source contact in a lateral direction perpendicular to the stacking direction is surrounded by an absorber on the rear side;
wherein at least one of the first semiconductor layer or the second semiconductor layer is continuous across the μ-LEDs; and
wherein a second light source contact is adjacent to a transparent contact layer and the second light source contact of adjacent μ-LEDs are separated from each other by a front absorber on the front side in a lateral direction perpendicular to the stacking direction.

### Claim 2 (depends on 1)

The display arrangement according to claim 1, wherein the first semiconductor layer and the second semiconductor layer comprise a p- or n-conductivity lower than 104 Sm−1.

### Claim 3 (depends on 1)

The display arrangement according to claim 1, wherein the layer thickness of the first semiconductor layer in the stacking direction is at most ten times the maximum diagonal of the first light source contact in the lateral direction.

### Claim 4 (depends on 1)

The display arrangement according to claim 1, wherein the projection area of the first light source contact on the μ-LED back is at most 25% of the area of the μ-LED back.

### Claim 5 (depends on 1)

The display arrangement according to claim 1, wherein the second light source contact made of a transparent material is arranged in the stacking direction above the second semiconductor layer for each μ-LED, which is electrically conductively connected to the transparent contact layer on the front side of the monolithic pixelated optochip.

### Claim 6 (depends on 1)

The display arrangement according to claim 1, wherein the front absorber extends against the stacking direction up to the second semiconductor layer.

### Claim 7 (depends on 1)

The display arrangement according to claim 1, wherein, with respect to the stacking direction, an optochip contact element whose cross-sectional area is larger than that of the first light source contact is adjacent below the first light source contact.

### Claim 8 (depends on 1)

The display arrangement according to claim 1, wherein, in the case of two adjacent μ-LEDs, one μ-LED is configured as a redundant element to the other μ-LED, to which a fuse element in the IC substrate component is assigned, which fuse element is designed to replace the other μ-LED by the redundant element if the other μ-LED fails or to disconnect the redundant element from a power supply if the other μ-LED is functional.

### Claim 9 (depends on 1)

The display arrangement of claim 1, wherein the first light source contact is encapsulated in a lateral direction perpendicular to the stacking direction by an absorber on the rear side, said absorber being in contact with the surface of the first light source contact in the stacking direction.