Backlight assembly for a display

Liquid crystal cells – elements and systems – Particular structure – Particular illumination

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Details

362 31, 349 64, G02F 11335

Patent

active

061307300

ABSTRACT:
Systems and methods for providing an LGD with a collimated backlight and a non-Lambertian diffuser are described. An LCD system includes: an illumination source for producing light; a collimating waveguide optically connected to the illumination source, the collimating waveguide including a top surface, an incident end and a plurality of substantially parallel optical elements for redirecting light from the incident end to, and through, the top surface by total internal reflection (TR), each of the plurality of substantially parallel optical elements including a first facet that is nonparallel to the top surface and a mirrored second facet that is nonparallel to the top surface; a reflector optically connected to the light source and optically connected to the collimating waveguide, the reflector (1) at least partially surrounding the illumination source, and (2) reflecting light from said illumination source to said incident end by direct reflection; a liquid crystal display optically connected to the collimating waveguide; and a non-Lambertian diffuser optically connected to the liquid crystal display for directing light from said liquid crystal display. The light from the reflector is directly incident upon the incident end. The systems and methods provide advantages in that the light from the LCD is bright and homogenous.

REFERENCES:
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patent: 5506924 (1996-04-01), Inoue
patent: 5575549 (1996-11-01), Ishikawa et al.
patent: 5775791 (1998-07-01), Yoshikawa et al.
patent: 5838403 (1998-11-01), Jannson et al.

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