Backlight source device with circular arc diffusion units

Details Backlight source device with circular arc diffusion units Backlight source device with circular arc diffusion units

1999-01-20

2000-06-13

Tso, Laura K.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 31, G01D 1128

Patent

active

060740698

ABSTRACT:
A backlight source device with circular arc diffusion units includes a transparent guide plate with circular arc diffusion units on the front or rear surface of the plate. A diffusion piece above the guide plate, a reflecting piece below the guide plate, and a lateral light source. Therefore, the dark and light regions in the backlight source device may be removed so that the illumination of the backlight becomes stronger and more uniform.

REFERENCES:
patent: 5128843 (1992-07-01), Kenmochi
patent: 5130898 (1992-07-01), Akahane
patent: 5134549 (1992-07-01), Yokoyama
patent: 5575549 (1996-11-01), Ishikawa et al.
patent: 5584556 (1996-12-01), Yokoyama et al.
patent: 5779337 (1998-07-01), Saito et al.

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