# US 2020/0393684 A1 · Display device and head mount display device

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- Number: US 2020/0393684 A1
- Document ID: US20200393684A1
- Status: Published application
- Kind: A1
- Application number: 17/004,762
- Filed: 2020-08-27
- Published: 2020-12-17
- Earliest claimed: 2017-09-22
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Chung Sock CHOI; Hyun Ho KIM; So Young LEE; Sang Hwan CHO
- Web page: https://patentgrep.com/patent/US20200393684A1

## CPC

- G02B 27/0172: {characterised by optical features}
- G02B 5/0215: {the surface having a regular structure}
- G02B 5/18: Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)}
- G02B 5/1871: {Transmissive phase gratings}
- G02B 5/189: {Structurally combined with optical elements not having diffractive power}
- G02B 5/28: Interference filters
- G02B 27/0944: {Diffractive optical elements, e.g. gratings, holograms (gratings per se G02B5/18; holograms used as optical elements per se G02B5/32)}
- G02B 27/0955: {Lenses (lenses per se G02B3/00)}
- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/805: {Electrodes}
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 59/8793: {Arrangements for polarized light emission (H10K59/8791 takes precedence)}
- G02B 1/115: Multilayers
- G02B 2027/0112: {comprising device for genereting colour display}
- G02B 2027/0123: {comprising devices increasing the field of view}
- H10K 59/871: {Self-supporting sealing arrangements}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes a display panel including a substrate and a plurality of display elements disposed on the substrate, and a diffraction panel including a plurality of diffraction patterns disposed on a path of light emitted from the plurality of display elements. The plurality of diffraction patterns are disposed in a first direction to have a first period, each of the plurality of diffraction patterns includes a first refractive layer, a second refractive layer disposed on the first refractive layer, and a third refractive layer disposed on the second refractive layer, and a refractive index of the second refractive layer is higher than a refractive index of the first refractive layer and a refractive index of the third refractive layer.

## Claims

### Claim 1

A display device comprising:
a display panel comprising a substrate and a plurality of display elements disposed on the substrate;
an anti-reflection panel including a polarizer on the display panel;
a diffraction panel on the anti-reflection panel,
wherein the diffraction panel includes a plurality of diffraction patterns having at least one refractive layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the plurality of diffraction patterns are isolated from each other.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the diffraction panel further includes a space between the plurality of diffraction patterns, and the space extends a first direction and a second direction perpendicular to the first direction.

### Claim 4 (depends on 1)

The display device of claim 1, wherein a diffraction pattern of the plurality of diffraction patterns includes:
a first layer; and
a second layer disposed on the first layer,
wherein a refractive index of the second layer is different from a refractive index of the first layer.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the diffraction pattern further includes a third layer disposed on the second r layer.

### Claim 6 (depends on 5)

The display device of claim 5, wherein a refractive index of the second layer is higher than a refractive index of the first layer and a refractive index of the third layer.

### Claim 7 (depends on 5)

The display device of claim 5, wherein the diffraction pattern further includes a fourth layer which is in contact with both side surfaces of the second layer.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the first layer, the third layer, and the fourth layer surround the second layer.

### Claim 9 (depends on 7)

The display device of claim 7, wherein a refractive index of the second layer is higher than a refractive index of the first layer, a refractive index of the third layer, and a refractive index of the fourth layer.

### Claim 10 (depends on 7)

The display device of claim 7, a second thickness of the second layer is larger than a first thickness of the first layer, a third thickness of the third layer, and a fourth thickness of the fourth layer.

### Claim 11 (depends on 10)

The display device of claim 10, further comprising:
a protective layer on the plurality of diffraction patterns,
wherein the first thickness, the second thickness, and the third thickness satisfy a following Expression 1:
(m*λL1)−60 (nm)≤A≤(m*λL1)+60 (nm)
U=[{(n230−n211c)×t3}+[{(n230−n211b)×t2}+(n230−n211a)×t1)]
A≠U [Expression 1]
(in the Expression 1, λL1 denotes a wavelength of a light emitted from a display element among the plurality of display elements, n211a denotes the refractive index of the first layer, n211b denotes the refractive index of the second layer, n211c denotes the refractive index of the third layer, n230 denotes a refractive index of the protective layer, units of U and A are nm, and m is an integer equal to or greater than 0.)

### Claim 12 (depends on 10)

The display device of claim 10, wherein a fourth thickness of the fourth layer is same as the first thickness.

### Claim 13 (depends on 6)

The display device of claim 6, wherein the first layer, the second layer, and the third layer are sequentially stacked, and a second thickness of the second layer is larger than a first thickness of the first layer and a third thickness of the third layer.

### Claim 14 (depends on 6)

The display device of claim 6, wherein the plurality of diffraction patterns have a shape in which a plurality of trapezoidal shapes are connected in the cross-sectional view.

### Claim 15 (depends on 12)

The display device of claim 12, further comprising:
a protective layer on the plurality of diffraction patterns,
wherein a second thickness of the second layer satisfies a following Expression 2:
(m*λL1)−60 (nm)≤A≤(m*λL1)+60 (nm)
A≠{(n230−n262)×t262} [Expression 2]
(in the Expression 2, λL1 denotes a wavelength of a light emitted from a display element among the plurality of display elements, n262 denotes a refractive index of the second layer, t262 denotes the second thickness, n230 denotes a refractive index of the protective layer, A unit of A is nm, and m is an integer equal to or greater than 0.)

### Claim 16 (depends on 6)

The display device of claim 6, wherein the second layer is spaced apart from another second layer,
the first layer and the third layer are in contact with each other between the second layer and the another second layer.

### Claim 17 (depends on 16)

The display device of claim 16, wherein a second thickness of the second layer is larger than a first thickness of the first layer and a third thickness of the third layer.

### Claim 18 (depends on 16)

The display device of claim 16, further comprising:
a protective layer on the plurality of diffraction patterns,
wherein a second thickness of the second layer satisfies a following Expression 3:
(m*λL1)−60 (nm)≤A≤(m*λL1)+60 (nm)
A≠{(n230−n272)×t272} [Expression 3]
(in the Expression 3, λL1 denotes a wavelength of a light emitted from a display element among the plurality of display elements, n272 denotes a refractive index of the second layer, t272 denotes the second thickness, n230 denotes a refractive index of the protective layer, A unit of A is nm, and m is an integer equal to or greater than 0.)

### Claim 19 (depends on 1)

The display device of claim 1, wherein the anti-reflection panel further includes a phase retarder.

### Claim 20 (depends on 1)

The display device of claim 1, further comprising:
an input sensing panel between the display panel and the anti-reflection panel to obtain coordinate information through an external input.