# US 10,872,939 B2 · Viewing angle color shift control

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- Number: US 10,872,939 B2
- Document ID: US10872939B2
- Status: Granted
- Kind: B2
- Application number: 16/216,651
- Filed: 2018-12-11
- Published: 2020-03-05
- Granted: 2020-12-22
- Earliest claimed: 2018-09-04
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Aleksandr N. Polyakov; Meng-Huan Ho; Yi Huang; Yi Qiao; David S. Hum; Jean-Pierre S. Guillou; Yanming Li; Jun Qi; KiBeom Kim; Kwang Ohk Cheon; Cheng Chen; Rui Liu; ByoungSuk Kim; Ying-Chih Wang; Hung Sheng Lin; Donghee Nam; Tyler R. Kakuda
- Web page: https://patentgrep.com/patent/US10872939B2

## CPC

- G02B 5/0294: {adapted to provide an additional optical effect, e.g. anti-reflection or filter}
- G02B 5/20: Filters (polarising elements G02B5/30)
- G02B 5/201: {in the form of arrays}
- 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 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/875: {Arrangements for extracting light from the devices}
- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H10K 59/877: {comprising scattering means}
- H10K 59/8793: {Arrangements for polarized light emission (H10K59/8791 takes precedence)}
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- H10K 59/352: {the areas of the RGB subpixels being different}
- H10K 59/353: {characterised by the geometrical arrangement of the RGB subpixels}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Display structures for controlling viewing angle color shift are described. In various embodiments, polarization sensitive diffusers, independent controlled cathode thicknesses, filtermasks, and color filters are described.

## Claims

### Claim 1

A display structure comprising:
a backplane including an emissive light emitting diode (LED);
a polarization sensitive diffuser layer over the LED;
a quarterwave film adjacent the polarization sensitive diffuser; and
a linear polarization film over the polarization sensitive diffuser layer and the quarterwave film;
wherein the polarization sensitive diffuser is designed to preferentially transmit linearly polarized light entering the polarization sensitive diffuser from the linear polarization film rather than scattering the linearly polarized light, and to scatter circularly polarized light reflected from the backplane.

### Claim 2 (depends on 1)

The display structure of claim 1, wherein the quarterwave film is over the polarization sensitive diffuser layer.

### Claim 3 (depends on 1)

The display structure of claim 1, wherein the quarterwave film is underneath the polarization sensitive diffuser layer.

### Claim 4 (depends on 1)

The display structure of claim 1, wherein the polarization sensitive diffuser layer comprises a liquid crystal polymer film underneath an isotropic film, wherein the liquid crystal polymer film includes a top surface characterized by a higher average surface roughness than a top surface of the isotropic film.

### Claim 5 (depends on 1)

The display structure of claim 1, wherein the polarization sensitive diffuser layer comprises liquid crystals dispersed in an isotropic film.

### Claim 6 (depends on 5)

The display structure of claim 5, wherein the liquid crystals are phase separated nematic liquid crystals dispersed in the isotropic film.

### Claim 7 (depends on 6)

The display structure of claim 6, wherein the phase separated nematic liquid crystals are droplets within a stretched isotropic polymer of the isotropic film.

### Claim 8 (depends on 1)

The display structure of claim 1, wherein the polarization sensitive diffuser is selective to scattering a specific handedness of the circularly polarized light reflected from the backplane.

### Claim 9 (depends on 1)

The display structure of claim 1, wherein the polarization sensitive diffuser is designed to scatter light emitted from the emissive LED.

### Claim 10 (depends on 9)

The display structure of claim 9, wherein the quarterwave film is underneath the polarization sensitive diffuser layer.

### Claim 11 (depends on 10)

The display structure of claim 10, further comprising a compensation film underneath the quarterwave film, wherein the compensation film is designed to shift a wavelength phase of the circularly polarized light reflected from the backplane.

### Claim 12 (depends on 10)

The display structure of claim 10, wherein the polarization sensitive diffuser layer comprises liquid crystals dispersed in an isotropic film.

### Claim 13 (depends on 12)

The display structure of claim 12, wherein the liquid crystals are phase separated nematic liquid crystals dispersed in the isotropic film.

### Claim 14 (depends on 13)

The display structure of claim 13, wherein the phase separated nematic liquid crystals are droplets within a stretched isotropic polymer of the isotropic film.

### Claim 15 (depends on 1)

The display structure of claim 1, wherein the LED is an organic light emitting diode (OLED).