Title:
ILLUMINATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/199652
Kind Code:
A1
Abstract:
The present invention achieves a display device that makes it possible to easily change the color temperature of white light and the brightness distribution of optical spots. To this end, the present invention adopts the following configuration. Specifically, this illumination device is characterized in that: a first white LED 21, a second white LED 22, and a third white LED 23 are disposed at regular intervals on a first side surface and a second side surface facing the first side surface of a light guide plate 13; a first prism array extending in a direction perpendicular to the first side surface and aligned in a direction parallel thereto is formed on the main surface of the light guide plate 13; a second prism array extending in a direction parallel to the first side surface and aligned in a direction perpendicular thereto is formed on the rear surface of the light guide plate 13; a reflective sheet 12 is disposed on the rear surface side of the light guide plate 13; a first prism sheet 14 is disposed on the main surface side of the light guide plate 13; and a third prism array extending in a direction parallel to the first side surface of the light guide plate 13 and aligned in a direction perpendicular thereto is formed on the surface of the first prism sheet 14 toward the light guide plate 13.
Inventors:
HASEGAWA MAKOTO (JP)
SUZUKI NOBUYUKI (JP)
SUZUKI NOBUYUKI (JP)
Application Number:
PCT/JP2021/003745
Publication Date:
October 07, 2021
Filing Date:
February 02, 2021
Export Citation:
Assignee:
JAPAN DISPLAY INC (JP)
International Classes:
F21S2/00; F21V9/40; G02B5/04; G02F1/13; G02F1/13357
Domestic Patent References:
| WO2013122155A1 | 2013-08-22 |
Foreign References:
| JP2013004197A | 2013-01-07 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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