# US 2025/0093563 A1 · Angular occlusion filter

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- Number: US 2025/0093563 A1
- Document ID: US20250093563A1
- Status: Published application
- Kind: A1
- Application number: 18/732,070
- Filed: 2024-06-03
- Published: 2025-03-20
- Earliest claimed: 2023-09-19
- Assignees: Meta Platforms Technologies, LLC
- Applicants: Meta Platforms Technologies, LLC
- Inventors: Zhimin Shi; Zhaoyu Nie; Sheng Ye; Arman Boromand; Xiayu Feng; Andrew John Ouderkirk
- Web page: https://patentgrep.com/patent/US20250093563A1

## CPC

- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical element includes a display device and an angular occlusion filter disposed over at least one surface of the display device. The angular occlusion filter may be configured to modulate one or more of transmission, reflection, and polarization of image or ambient light incident upon the display device.

## Claims

### Claim 1

An angular occlusion filter comprising:
a multilayer stack comprising alternating first and second polymer layers, wherein the first polymer layers comprise an optically anisotropic polymer material and the second polymer layers comprise an optically isotropic polymer material.

### Claim 2 (depends on 1)

The angular occlusion filter of claim 1, wherein the first polymer layers comprise inclusions of an anisotropic second phase.

### Claim 3 (depends on 2)

The angular occlusion filter of claim 2, wherein the anisotropic second phase comprises a liquid crystal material.

### Claim 4 (depends on 1)

The angular occlusion filter of claim 1, wherein the second polymer layers comprise inclusions of an isotropic second phase.

### Claim 5 (depends on 1)

The angular occlusion filter of claim 1, wherein the first polymer layers have refractive indices nA,x, nA,y, and nA,z, and the second polymer layers have a refractive index nB, such that 0.0002<nA,x−nA,y<0.03, nA,y=nB, and nA,z<nB.

### Claim 6 (depends on 1)

The angular occlusion filter of claim 1, wherein the first polymer layers have refractive indices nA,x, nA,y, and nA,z, and the second polymer layers have a refractive index nB, such that nA,z>nA,x>nA,y, 0.002<nA,x−nA,y<0.03, nA,y=nB, and nA,z>nB.

### Claim 7

An angular occlusion filter comprising:
a multilayer stack comprising alternating first and second layers, wherein the first layers comprise an optically anisotropic material and the second layers comprise an optically isotropic material.

### Claim 8 (depends on 7)

The angular occlusion filter of claim 7, wherein the first layers comprise an optically anisotropic organic or inorganic material and the second layers comprise an optically isotropic polymer.

### Claim 9 (depends on 7)

The angular occlusion filter of claim 7, wherein the first layers comprise a liquid crystal material and the second layers comprise an optically isotropic polymer.

### Claim 10

An optical element comprising:
a display device; and
an angular occlusion filter disposed over at least one surface of the display device.

### Claim 11 (depends on 10)

The optical element of claim 10, wherein the display device comprises a waveguide display.

### Claim 12 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises an angular occlusion module.

### Claim 13 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises a multilayer thin film.

### Claim 14 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises a multilayer stack of alternating first and second polymer layers.

### Claim 15 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises a multilayer stack of alternating first and second polymer layers, the first polymer layers comprise an optically anisotropic polymer material, and the second polymer layers comprise an optically isotropic polymer material.

### Claim 16 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises an anti-reflection module.

### Claim 17 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises a polarization adjustment module.

### Claim 18 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter comprises an angular occlusion module, a polarization adjustment module overlying the angular occlusion module, and an anti-reflection module overlying the polarization adjustment module.

### Claim 19 (depends on 10)

The optical element of claim 10, wherein the angular occlusion filter is configured to modulate one or more of transmission, reflection, and polarization of image or ambient light incident upon the display device.

### Claim 20 (depends on 10)

The optical element of claim 10, comprising two or more angular occlusion filters.