# US 10,761,336 B2 · Display device

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- Number: US 10,761,336 B2
- Document ID: US10761336B2
- Status: Granted
- Kind: B2
- Application number: 15/513,380
- Filed: 2016-08-05
- Published: 2018-08-16
- Granted: 2020-09-01
- Earliest claimed: 2016-01-08
- Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.; Beijing BOE Optoelectronics Technology Co., Ltd.
- Inventors: Qian Wang; Xue Dong; Wenqing Zhao; Xiaochuan Chen; Jian Gao; Pengcheng Lu
- Web page: https://patentgrep.com/patent/US10761336B2

## CPC

- G02B 27/4205: {having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant}
- G02B 27/30: Collimators
- G02B 30/27: involving lenticular arrays
- G02F 1/1323: {Arrangements for providing a switchable viewing angle}
- G02F 1/13306: {Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence)}
- G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)}
- G02F 1/13471: {in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells (G02F1/13475 takes precedence)}
- G02F 1/29: for the control of the position or the direction of light beams, i.e. deflection
- G02F 1/133526: {Lenses, e.g. microlenses or Fresnel lenses}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A display device is provided. The display device comprises: a display panel; a collimation optical element located on a light emission side of the display panel and configured to modulate a first light emitted from the display panel into a collimated second light and emit the collimated second light; and a light modulation element located on a light emission side of the collimation optical element and configured to adjust an emission angle of the second light from the light modulation element. The first light emitted from the display panel is modulated into the collimated second light by the collimation optical element, the emission angle of the second light emitting from the light modulation element is adjusted by the light modulation element, such that the direction of the emission light of the display device is controllable.

## Claims

### Claim 1

A display device, comprising:
a display panel;
a collimation optical element located on a light emission side of the display panel and configured to modulate a first light emitted from the display panel into a collimated second light and emit the collimated second light; and
a light modulation element located on a light emission side of the collimation optical element and configured to adjust an emission angle of the second light from the light modulation element, wherein
the collimation optical element includes: a diffraction grating, configured to convert a first light incident onto the diffraction grating into a parallel light in which light rays are parallel to each other; a first covering layer located on a light emission side of the diffraction grating; and a second covering layer located on the first covering layer;
a refractive index of the first covering layer is smaller than a refractive index of the second covering layer, and the first covering layer and the second covering layer are configured to collimate the parallel light emitted from the diffraction grating to obtain the second light;
each of the diffraction rating, the first covering layer, and the second covering layer is provided on the light emission side of the display panel; and
the first light emitted from the display panel is not perpendicular to a surface of the diffraction grating facing the display panel, but the collimated second light emitted by the collimation optical element is perpendicular to the surface of the diffraction grating facing the display panel.

### Claim 2 (depends on 1)

The device according to claim 1, wherein
each sub-pixel unit in the display panel corresponds to one diffraction grating; or
each column of sub-pixel units with the same color in the display panel corresponds to one diffraction grating; or
each row of sub-pixel units with the same color in the display panel corresponds to one diffraction grating; or
at least two sub-pixel units with different colors in the display panel correspond to one diffraction grating.

### Claim 3 (depends on 1)

The device according to claim 1, wherein
the diffraction grating includes a grating surface and a plurality of groove surfaces located above the grating surface;
for each groove surface, an included angle r between the groove surface and the grating surface, a width d of the groove surface and a wavelength λ of light incident to the groove surface meet a formula:
2d*sin r=λ.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the refractive index of the first covering layer is different from a refractive index of the diffraction grating.

### Claim 5 (depends on 1)

The device according to claim 1, wherein
the light modulation element includes at least one first light modulation unit,
the first light modulation unit includes: a first substrate, a second substrate, a first liquid crystal layer located between the first substrate and the second substrate, a first electrode, and a second electrode, and
by applying voltages to the first electrode and the second electrode, the emission angle of the second light is adjusted in a first direction.

### Claim 6 (depends on 5)

The device according to claim 5, wherein the first electrode and the second electrode are located between the first substrate and the second substrate.

### Claim 7 (depends on 5)

The device according to claim 5, wherein each first light modulation unit corresponds to at least one sub-pixel unit in the display panel.

### Claim 8 (depends on 7)

The device according to claim 7, wherein each first light modulation unit corresponds to at least one column of sub-pixel units in the display panel, or each first light modulation unit corresponds to at least one row of sub-pixel units in the display panel.

### Claim 9 (depends on 5)

The device according to claim 5, wherein after the voltages are applied to the first electrode and the second electrode in the first light modulation unit, an equivalent optical structure of the first light modulation unit is a liquid crystal prism or a liquid crystal lens.

### Claim 10 (depends on 5)

The device according to claim 5, wherein
the light modulation element further includes at least one second light modulation unit disposed on the first light modulation unit,
the second light modulation unit includes: a third substrate, a fourth substrate, a second liquid crystal layer located between the third substrate and the fourth substrate, a third electrode, and a fourth electrode, and
by applying voltages to the third electrode and the fourth electrode, the emission angle of the second light is adjusted in a second direction different from the first direction.

### Claim 11 (depends on 10)

The device according to claim 10, wherein the third electrode and the fourth electrode are located between the third substrate and the fourth substrate.

### Claim 12 (depends on 10)

The device according to claim 10, wherein each second light modulation unit corresponds to at least one sub-pixel unit in the display panel.

### Claim 13 (depends on 12)

The device according to claim 12, wherein each second light modulation unit corresponds to at least one column of sub-pixel units in the display panel, or each second light modulation unit corresponds to at least one row of sub-pixel units in the display panel.

### Claim 14 (depends on 10)

The device according to claim 10, wherein after the voltages are applied to the third electrode and the fourth electrode in the second light modulation unit, an equivalent optical structure of the second light modulation unit is a liquid crystal prism or a liquid crystal lens.

### Claim 15 (depends on 10)

The device according to claim 10, wherein the first electrode is a strip electrode, the third electrode is a strip electrode, and an arrangement direction of the first electrode and an arrangement direction of the third electrode are perpendicular to each other.

### Claim 16 (depends on 10)

The device according to claim 10, wherein the first electrode is a strip electrode, the fourth electrode is a strip electrode, and an arrangement direction of the first electrode and an arrangement direction of the fourth electrode are perpendicular to each other.

### Claim 17 (depends on 10)

The device according to claim 10, wherein the second electrode is a strip electrode, the third electrode is a strip electrode, and an arrangement direction of the second electrode and an arrangement direction of the third electrode are perpendicular to each other.

### Claim 18 (depends on 10)

The device according to claim 10, wherein the second electrode is a strip electrode, the fourth electrode is a strip electrode, and an arrangement direction of the second electrode and an arrangement direction of the fourth electrode are perpendicular to each other.