Backlight device for display apparatus

Details Backlight device for display apparatus Backlight device for display apparatus

1995-05-22

1998-10-06

Sember, Thomas M.

Illumination

Revolving

362 26, 362330, F21V 800

Patent

active

058166777

ABSTRACT:
A backlight device suitable for illuminating a transmission-type display device, such as a liquid crystal device, is constituted by a reflection member for reflecting light, a transmission member disposed opposite to the reflection member so as to form a space from the reflection member, and a light source disposed to emit light into the space. Light issued from the light source into the space is reflected by the reflection member and transmitted through the transmission member. The transmission member is preferably provided with a reflection layer having apertures having an aperture ratio which increases with an increase in distance from the light source toward a center of the space in a linear function, a hyperbolic function or a function intermediate therebetween of the distance from the light source. Between the transmission member and the display device, a prism sheet and/or a diffusion sheet may be disposed so as to improve the frontal illumination performance.

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Patent Abstracts of Japan, vol. 16 No. 278 (M-1268), 22 Jun. 1992 & JP-A-04 071105 (Canon Inc) 5 Mar. 1992, *abstract*.
Patent Abstracts of Japan, vol. 18 No. 146 (P-1707), 10 Mar. 1994 & JP-A-05 323318 (Sony Corp) 7 Dec. 1993, *abstract*.

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