Title:
LIGHTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/157508
Kind Code:
A1
Abstract:
This lighting device comprises a light source including at least two types of light emitting elements different in color temperature, an optical element which includes a plurality of liquid crystal cells stacked sequentially and which controls the light distribution of light emitted from the light source, and a control unit which controls the light source. The control unit controls the optical element to change from a first light distribution state to a second light distribution state, which is different from the first light distribution state in light distribution state, and controls the light source to maintain the same color temperature of the light emitted in a direction perpendicular to a surface of the optical element between the first light distribution state and the second light distribution state.
Inventors:
IKEDA KOJIRO (JP)
KOITO TAKEO (JP)
TAKIZAWA KEIJI (JP)
KOITO TAKEO (JP)
TAKIZAWA KEIJI (JP)
Application Number:
PCT/JP2023/000297
Publication Date:
August 24, 2023
Filing Date:
January 10, 2023
Export Citation:
Assignee:
JAPAN DISPLAY INC (JP)
International Classes:
H05B47/155; F21S2/00; F21V9/40; G02F1/13; G02F1/1333; F21Y115/10
Domestic Patent References:
| WO2011030578A1 | 2011-03-17 |
Foreign References:
| JP2007079093A | 2007-03-29 | |||
| JP2007047229A | 2007-02-22 |
Attorney, Agent or Firm:
TAKAHASHI, HAYASHI AND PARTNER PATENT ATTORNEYS, INC. (JP)
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