Title:
BACKLIGHT
Document Type and Number:
WIPO Patent Application WO/2018/199011
Kind Code:
A1
Abstract:
Provided is a direct backlight which allows the number of LEDs used to be reduced while promoting a reduction in the thickness of the backlight. LEDs (13) are mounted in square lattices on a mounting substrate (11). Protruding parts (15) of a diffusion plate (14) are each arranged above the vicinity of the center of each square lattice unit. A fraction of light emitted from the LEDs (13) that travels in the lateral direction between the mounting substrate (11) and the diffusion plate (14) is captured by the protruding portions (15), refracted and reflected at the interface of the protruding portions (15) and diffused by diffusion particles, as a result of which, the fraction of light is turned into illumination light traveling upward.
Inventors:
HORIUCHI TAKUMA (JP)
MIYASHITA TAKUMI (JP)
WATANABE SEIICHI (JP)
MIYASHITA TAKUMI (JP)
WATANABE SEIICHI (JP)
Application Number:
PCT/JP2018/016428
Publication Date:
November 01, 2018
Filing Date:
April 23, 2018
Export Citation:
Assignee:
CITIZEN ELECTRONICS (JP)
CITIZEN WATCH CO LTD (JP)
CITIZEN WATCH CO LTD (JP)
International Classes:
F21S2/00; F21Y115/10
Domestic Patent References:
| WO2016175111A1 | 2016-11-03 |
Foreign References:
| JP2005149942A | 2005-06-09 |
Attorney, Agent or Firm:
ASAKAWA Tetsu (JP)
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