Title:
PLANAR LIGHT SOURCE DEVICE AND DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/070343
Kind Code:
A1
Abstract:
Provided is a planar light source device in which light emitted from a light-emitting element spreads, in an appropriate manner, near an optical axis of the light-emitting element and does not spread, in an excessive manner, to a position distanced from the optical axis. The planar light source device includes: a substrate; a plurality of light-emitting devices that each includes a light-emitting element and a light flux control member; and a light diffusion board. Each light-emitting device satisfies y < 2P, and 1.0G -1.5G < 1.5G - 2.0G with respect to light for which a light emission angle θ from a light emission center is 0° to less than 80°. y is the distance from a center axis of an arrival point on the light diffusion board of light rays emitted at the light emission angle θ. P is the distance between centers of adjacent light-emitting devices that are closest to each other. Each of 1.0G, 1.5G, and 2.0G is a slope of a tangent at a brightness value corresponding to a position that is 1.0-times, 1.5-times, and 2.0-times the distance between centers from the center axis, in a brightness distribution curve corresponding to a brightness distribution on the light diffusion board.
Inventors:
HIRAKA KENSUKE
Application Number:
PCT/JP2019/040093
Publication Date:
April 15, 2021
Filing Date:
October 10, 2019
Export Citation:
Assignee:
ENPLAS CORP (JP)
International Classes:
H01L33/58
Domestic Patent References:
| WO2018159676A1 | 2018-09-07 | |||
| WO2017061370A1 | 2017-04-13 | |||
| WO2010092632A1 | 2010-08-19 |
Foreign References:
| JP2015164115A | 2015-09-10 | |||
| JP2018198284A | 2018-12-13 | |||
| US20180347786A1 | 2018-12-06 | |||
| US20190041029A1 | 2019-02-07 |
Attorney, Agent or Firm:
WASHIDA & ASSOCIATES (JP)
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