# US 12,007,097 B2 · Lighting device

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- Number: US 12,007,097 B2
- Document ID: US12007097B2
- Status: Granted
- Kind: B2
- Application number: 18/378,807
- Filed: 2023-10-11
- Published: 2024-04-11
- Granted: 2024-06-11
- Earliest claimed: 2022-10-11
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Makoto Hasegawa; Nobuyuki Suzuki; Takeo Koito
- Web page: https://patentgrep.com/patent/US12007097B2

## CPC

- F21V 14/003: {by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices}
- F21V 7/0016: {on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes}
- F21V 7/06: with parabolic curvature
- G02F 1/133528: {Polarisers}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/1347: Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F 1/294: {Variable focal length devices}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- 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 lighting device, comprises: a first reflector that includes a first hole where a light source is disposed, a second hole that emits light, and a reflection curved surface that connects the first hole and the second hole to each other, and the first reflector emits light to a first direction; a liquid crystal lens disposed to cover the second hole of the first reflector; and a polygonal pyramid including a bottom surface and a plurality of inclined surfaces, and being disposed so that the plurality of inclined surfaces oppose the liquid crystal lens. The plurality of inclined surfaces are reflection surfaces, and on the reflection surfaces, a traveling path of the light traveling to the first direction changes to a second direction. The liquid crystal lens can configure lenses corresponding to the plurality of inclined surfaces.

## Claims

### Claim 1

A lighting device, comprising:
a first reflector that includes: a first hole where a light source is disposed; a second hole that emits light; and a reflection curved surface that connects the first hole and the second hole to each other, in which a line connecting the center of the first hole and the center of the second hole is made to be a first direction, and the first reflector emits light to the first direction;
a liquid crystal lens disposed to cover the second hole of the first reflector; and
a polygonal pyramid including a bottom surface and three or more plurality of inclined surfaces, and being disposed so that the plurality of inclined surfaces oppose the liquid crystal lens, wherein
the plurality of inclined surfaces are reflection surfaces, and on the reflection surfaces, a traveling path of the light traveling to the first direction changes to a second direction, the second direction intersecting the first direction, and
the liquid crystal lens can configure lenses corresponding to the plurality of inclined surfaces.

### Claim 2 (depends on 1)

The lighting device according to claim 1, wherein
the polygonal pyramid is a quadrangular pyramid.

### Claim 3 (depends on 1)

The lighting device according to claim 1, wherein
in the liquid crystal lens, a plurality of lens elements capable of polarizing a liquid crystal molecule are formed in a matrix.

### Claim 4 (depends on 1)

The lighting device according to claim 1, wherein
in the liquid crystal lens, a scanning line extends in a first direction, a signal line extends in a second direction intersecting the scanning line, and a lens element is formed in a region surrounded by the scanning line and the signal line.

### Claim 5 (depends on 1)

The lighting device according to claim 1, wherein
the liquid crystal lens is configured such that four liquid crystal lens panels overlap.

### Claim 6 (depends on 1)

The lighting device according to claim 1, wherein
an angle formed by the first direction and the second direction is 90 degrees.

### Claim 7 (depends on 2)

The lighting device according to claim 2, wherein
the liquid crystal lens is of a rectangular shape, and can be split into four regions by diagonal lines, the region being of a triangular shape.

### Claim 8 (depends on 2)

The lighting device according to claim 2, wherein
in a plan view, the quadrangular pyramid is of a rectangular shape having a first side, the liquid crystal lens is of a rectangular shape having a second side, and the first side of the quadrangular pyramid is in parallel with the second side of the liquid crystal lens.