Surface light source device of side light type

Details Surface light source device of side light type Surface light source device of side light type

Filed on

1997-09-30

Date issued

2000-09-26

Examiner

Patel, Nimeshkumar D.

Patent Class

Illumination

SubClass

Revolving

Other Related Categories

362 26, F21V 704

Type

Patent

Status

active

Patent number

061234303

Description

ABSTRACT:
Local irregularities in luminance are removed from a surface light source device of side light type 20 applied to a liquid crystal display or the like. In assembly, a reflection sheet 4 and a primary light source 23 are mounted on a light guide plate 2, and these components are housed at a predetermined position in a frame 21. The primary light source 23 has a fluorescent lamp 25 and a reflector 26, and supplied illumination light to an end surface (an incidence surface) 2A of the light guide plate 2. The reflector 26 presses the reflection sheet 4 against the light guide plate 2 and supports the reflection sheet. A support member 24 has a claw 24C engageable with a claw 21C of the frame 21. A light absorbable layer 27 is formed on an end portion of the reflection sheet 4. Since the reflection sheet 4 projects toward the primary light source and is pressed against the light guide plate 2 by the reflector 26, there is less quantity of light actually incident onto a lower edge ED, even if the illumination light makes a propagation toward the edge ED. Thus, it is possible to prevent the phenomenon that the edge ED on the side of the reflection sheet 4 is brightly illuminated with illumination light from occurring in the vicinity of the end surface (the incidence surface) 2A of the light guide plate 2 to which the light is supplied.

REFERENCES:
patent: 5709447 (1998-01-01), Murakami et al.
patent: 5735590 (1998-04-01), Kashima et al.
patent: 5810464 (1998-09-01), Ishikawa et al.

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