Illuminated LCD apparatus

Details Illuminated LCD apparatus Illuminated LCD apparatus

1994-10-27

1995-12-19

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Internal light source

362 27, 362242, 362248, 359 49, F21V 800

Patent

active

054774225

ABSTRACT:
A back-lit LCD apparatus comprises a LCD (1), one or more LEDs (3) (or other light sources), and a plate-like light guide (2) behind the LCD (1). An attenuating member (5) is included in front or behind the light guide (5). In the former case the attenuating member (5) is formed as a sheet of reflective material on which is printed a pattern of non-reflective dots for reducing the intensity of light reaching portions of the LCD nearest to the light source. In the latter case the attenuating member (5) is transparent and the dots are either opaque or reflective. The size and frequency of the dots may be varied to adjust the level of attenuation. Also, the pattern of dots may be graduated to provide progressively less attenuation as the distance from the LEDs increases.

REFERENCES:
patent: 4206501 (1980-06-01), Brooks
patent: 4267489 (1981-05-01), Morohashi
patent: 4502761 (1985-03-01), Knoll et al.
patent: 4673254 (1987-06-01), Kato et al.
patent: 4729068 (1988-03-01), Ohe
patent: 4803399 (1989-02-01), Ogawa et al.
patent: 4975808 (1990-12-01), Bond et al.
patent: 4998804 (1991-03-01), Horiuchi
patent: 5057974 (1991-10-01), Mizobe
Patent Abstracts of Japan, vol. 15, No. 119 (P-1183) & JP03-009306, Mar. 22, 1991, 1 page.
Patent Abstracts of Japan, vol. 13, No. 146 (P854) (3494) & JP63 309,918, Dec. 19, 1988, 1 page.

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