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Patent Searching and Data


Title:
PLANAR LIGHT SOURCE DEVICE AND DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/166681
Kind Code:
A1
Abstract:
This planar light source device has a case, a light emitting device, light absorbing portions, and a light diffuser plate. The light emitting device has a light-emitting element and a beam control member. The beam control member has an incident surface, two reflective surfaces, and two exit surfaces. The light absorbing units are arranged occupying the entirety of a first region which satisfies at least H/tan(180-θ2) ≤ L ≤ H/tan(180-θ1) (θ1: greater than or equal to 120°, θ2: less than or equal to 150°) in a direction which is approximately perpendicular to the direction in which the two exit surfaces face each other and approximately perpendicular to the optical axis of the light-emitting element, and R450, R550, and R600 are each less than or equal to 50% and satisfy 0.5 ≤ r1 < 1, 0.5 ≤ r2 < 1, and 0.85 ≤ r3 ≤ 1.15.

Inventors:
OHASHI YUSUKE
Application Number:
PCT/JP2020/005690
Publication Date:
August 20, 2020
Filing Date:
February 14, 2020
Export Citation:
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Assignee:
ENPLAS CORP (JP)
International Classes:
F21S2/00; F21V5/00; F21V5/04; G02B5/02; G02F1/13357; F21Y105/00; F21Y115/10
Foreign References:
JP2013143219A2013-07-22
JP2009289815A2009-12-10
Attorney, Agent or Firm:
WASHIDA & ASSOCIATES (JP)
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