# US 10,373,936 B2 · Pixel elements including light emitters of variable heights

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- Number: US 10,373,936 B2
- Document ID: US10373936B2
- Status: Granted
- Kind: B2
- Application number: 15/683,183
- Filed: 2017-08-22
- Published: 2019-02-28
- Granted: 2019-08-06
- Earliest claimed: 2017-08-22
- Assignees: Facebook Technologies, LLC
- Applicants: Facebook Technologies, LLC
- Inventors: Yijing Fu; Wanli Chi; Patrick Joseph Hughes
- Web page: https://patentgrep.com/patent/US10373936B2

## CPC

- H10W 90/00: Package configurations
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B 27/017: {Head mounted}
- G02B 27/0172: {characterised by optical features}
- G06F 1/163: {Wearable computers, e.g. on a belt}
- H04N 13/344: with head-mounted left-right displays
- G02B 3/02: with non-spherical faces (G02B3/10 takes precedence)
- G02B 2027/0116: {comprising devices for correcting chromatic aberration}
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A head-mounted display (HMD) presents viewable media to a user. The HMD includes a light source and an optical block. The light source includes a first sub-pixel mounted on a first set of microbumps at a first height from a substrate and emits light within a first optical band, and a second sub-pixel mounted on a second set of microbumps at a second height from the substrate that is different from the first height, and emits light over a second optical band that is different than the first optical band. The optical block receives the image light from the light source, and directs the image light to an eyebox, wherein the first height and the second height mitigates longitudinal chromatic aberration and field curvature in the optical block.

## Claims

### Claim 1

A head-mounted display, comprising:
a light source comprising a plurality of pixel elements configured to emit image light that includes at least two different optical bands of light, the light source further comprising:
a first sub-pixel mounted on a first set of microbumps at a first height from a substrate and configured to emit light within a first optical band, and
a second sub-pixel mounted on a second set of microbumps at a second height from the substrate that is different from the first height, and the second sub-pixel is configured to emit light over a second optical band that is different than the first optical band, each of the first sub-pixel and the second sub-pixel comprising a plurality of light emitting elements; and
an optical block configured to receive the image light from the light source, and direct the image light to an eyebox, wherein the first height and the second height are configured to mitigate longitudinal chromatic aberration in the optical block.

### Claim 2 (depends on 1)

The head-mounted display of claim 1, wherein the light source includes a third sub-pixel mounted on a third set of microbumps at a third height from the substrate different from the second height, and the third sub-pixel is configured to emit light over a third optical band that is different than the first optical band and the second optical band, the third sub-pixel comprising a plurality of light emitting elements.

### Claim 3 (depends on 2)

The head-mounted display of claim 2, wherein the substrate is micromachined to a threshold value of thickness at one or more locations on the substrate to mount the third sub-pixel, the threshold value of thickness determined based on the first height and the second height to mitigate longitudinal chromatic aberration in the optical block.

### Claim 4 (depends on 3)

The head-mounted display of claim 3, wherein the threshold value of thickness is achieved by depositing one or more additive layers on the substrate to form one or more standoff portions, each standoff portion mounting at least the first sub-pixel and the second sub-pixel at a fourth height different from the third height to mitigate longitudinal chromatic aberration in the optical block.

### Claim 5 (depends on 2)

The head-mounted display of claim 2, wherein the third height from the substrate is different from the first height.

### Claim 6 (depends on 1)

The head-mounted display of claim 1, wherein the light source includes a template layer in each of the first sub-pixel and the second sub-pixel, the template layer configured to compensate a stress due to lattice mismatch with the substrate.

### Claim 7 (depends on 1)

The head-mounted display of claim 1, wherein the first set of microbumps and the second set of microbumps are associated with one or more out-of-plane heights determined based on a distance of separation from the optical block, the difference between the out-of-plane height and the distance of separation compensating for a field curvature of the optical block.

### Claim 8 (depends on 7)

The head-mounted display of claim 7, wherein the first set of microbumps and the second set of microbumps are mounted on the substrate micromachined to a threshold value of thickness to mitigate longitudinal chromatic aberration in the optical block.

### Claim 9 (depends on 7)

The head-mounted display of claim 7, wherein the first set of microbumps mounts the first sub-pixel including a first template layer and the second set of microbumps mounts a second sub-pixel including a second template layer different from the first template layer to mitigate longitudinal chromatic aberration in the optical block.

### Claim 10

An electronic display, comprising:
a substrate;
a plurality of microbumps;
a first sub-pixel mounted on a first set of microbumps on the substrate at a first height and configured to emit light within a first optical band; and
a second sub-pixel mounted on a second set of microbumps on the substrate at a second height that is different from the first height, and the second sub-pixel is configured to emit light within a second optical band that is different than the first optical band, wherein the first height and the second height are configured to mitigate longitudinal chromatic aberration in an optical block receiving light from the electronic display, each of the first sub-pixel and the second sub-pixel comprising a plurality of light emitting elements.

### Claim 11 (depends on 10)

The electronic display of claim 10, further comprising:
a third sub-pixel mounted on a third set of microbumps at a third height different from the second height, and the third sub-pixel is configured to emit light over a third optical band that is different than the first optical band and the second optical band, the third sub-pixel comprising a plurality of light emitting elements.

### Claim 12 (depends on 11)

The electronic display of claim 11, wherein the substrate is micromachined to a threshold value of thickness at one or more locations on the substrate to mount the third sub-pixel, the threshold value of thickness determined based on the first height and the second height to mitigate longitudinal chromatic aberration in the optical block.

### Claim 13 (depends on 12)

The electronic display of claim 12, wherein the threshold value of thickness is achieved by depositing one or more additive layers on the substrate to form one or more standoff portions, each standoff portion mounting at least the first sub-pixel and the second sub-pixel at a fourth height different from the third height.

### Claim 14 (depends on 12)

The head-mounted display of claim 12, wherein the third height from the substrate is different from the first height.

### Claim 15 (depends on 10)

The electronic display of claim 10, wherein the light source includes a template layer in each of the first sub-pixel and the second sub-pixel, the template layer configured to compensate a stress due to lattice mismatch with the substrate.

### Claim 16 (depends on 10)

The electronic display of claim 10, wherein the first set of microbumps and the second set of microbumps are associated with one or more out-of-plane heights determined based on a distance of separation from the optical block, the difference between the out-of-plane height and the distance of separation compensating for a field curvature of the optical block.

### Claim 17 (depends on 16)

The electronic display of claim 16, wherein the first set of microbumps and the second set of microbumps are mounted on the substrate micromachined to a threshold value of thickness to mitigate longitudinal chromatic aberration in the optical block.

### Claim 18 (depends on 16)

The electronic display of claim 16, wherein the first set of microbumps mounts the first sub-pixel including a first template layer and the second set of microbumps mounts a second sub-pixel including a second template layer different from the first template layer to mitigate longitudinal chromatic aberration in the optical block.