Light-emitting component and method of operating a light-emitting component
US-11391440-B2 · Jul 19, 2022 · US
Lighting device
US12320478B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12320478-B2 |
| Application number | US-202418796776-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 7, 2024 |
| Priority date | Feb 18, 2022 |
| Publication date | Jun 3, 2025 |
| Grant date | Jun 3, 2025 |
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Abstract
Official abstract text for this publication.
A lighting device includes a light source including at least two types of light emitting elements with different color temperatures, an optical element including a plurality of liquid crystal cells and configured to control a distribution of light emitted from the light source, and a control unit configured to control the light source. The control unit controls the optical element to change from a first light distribution state to a second light distribution state different from the first light distribution state. The control unit controls the light source so that a color temperature of light emitted in a direction perpendicular to a surface of the optical element is the same in the first light distribution state and the second light distribution state.
First claim
Opening claim text (preview).
What is claimed is: 1. A lighting device comprising: a light source comprising at least two types of light emitting elements with different color temperatures; an optical element comprising a plurality of liquid crystal cells, the optical element configured to control a distribution of light emitted from the light source; and a control unit configured to control the light source, wherein the control unit controls the optical element to change from a first light distribution state to a second light distribution state different from the first light distribution state, the control unit controls the light source so that a color temperature of light emitted in a direction perpendicular to a surface of the optical element is the same in the first light distribution state and the second light distribution state, and the control unit controls the light source based on a voltage applied to the optical element for controlling a distribution angle of the light emitted from the optical element. 2. The lighting device according to claim 1 , wherein the control unit controls the light source so that a front brightness from the optical element in the first light distribution state or the second light distribution state is greater than or equal to 1/100 and less than or equal to 1 of a front brightness from the optical element in an initial state in which no voltage is applied to the optical element. 3. The lighting device according to claim 1 , wherein the control unit controls an emission time of each of the at least two types of light emitting elements. 4. The lighting device according to claim 3 , wherein the at least two types of light emitting elements comprises a first light emitting element with a color temperature of 2000 K and a second light emitting element with a color temperature of 6500 K. 5. The lighting device according to claim 3 , wherein the at least two types of light emitting elements are alternatively arranged in a radial pattern. 6. The lighting device according to claim 5 , wherein the at least two types of light emitting elements comprises a first light emitting element with a color temperature of 2000 K and a second light emitting element with a color temperature of 6500 K.
Assignees
Inventors
Classifications
by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices · CPC title
Light-emitting diodes [LED] · CPC title
comprising an assembly of point-like light sources · CPC title
annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam · CPC title
Coordinated control of two or more light sources · CPC title
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Frequently asked questions
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- What does patent US12320478B2 cover?
- A lighting device includes a light source including at least two types of light emitting elements with different color temperatures, an optical element including a plurality of liquid crystal cells and configured to control a distribution of light emitted from the light source, and a control unit configured to control the light source. The control unit controls the optical element to change fro…
- Who is the assignee on this patent?
- Japan Display Inc
- What technology area does this patent fall under?
- Primary CPC classification F21S2/00. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jun 03 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).