Diffusively reflecting shield optically, coupled to backlit ligh

Details Diffusively reflecting shield optically, coupled to backlit ligh Diffusively reflecting shield optically, coupled to backlit ligh

1997-06-19

1999-03-16

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 71, 362 26, 362 27, 362 31, G02F 11335, G01D 1128, F21V 704

Patent

active

058836845

ABSTRACT:
An LCD backlight (30) comprises generally rectangular parallelepiped light guide (36) with an exit aperture (31) that is smaller than the surface area light guide (36) and illuminates a LCD (49). The light guide is illuminated by a plurality of Light Emitting Diodes (LED) dies (32) disposed along at least one edge of the light guide. A translucent fluorescent film (40) is disposed immediately above the exit aperture to diffuse the light exiting the exit aperture and also the change in the dominant wavelengths. Further, the light guide (36), the LEDs (32), fluorescent film (40), and additional light redirecting layers (42 and 44) are completely surrounded by and optically coupled to a diffusively reflective film (50), which covers the back surface, the edges, and the front surface of the light guide except for the exit aperture. This diffusively reflective shielding is covered by a conventional reflective material layer (51) to ensure no light escapes the backlight except through the exit aperture.

REFERENCES:
patent: 3864905 (1975-02-01), Richardson
patent: 4043636 (1977-08-01), Eberhardt et al.
patent: 4573766 (1986-03-01), Bournay, Jr. et al.
patent: 4630895 (1986-12-01), Abdala, Jr. et al.
patent: 4915478 (1990-04-01), Lenko et al.
patent: 5262928 (1993-11-01), Kashima et al.
patent: 5378298 (1995-01-01), Williams et al.
patent: 5392199 (1995-02-01), Kashima et al.
patent: 5461547 (1995-10-01), Ciupke et al.
patent: 5513288 (1996-04-01), Mayer
patent: 5600455 (1997-02-01), Ishikawa et al.
patent: 5666172 (1997-09-01), Ida et al.

Affiliated with

Also associated with

Rating

Diffusively reflecting shield optically, coupled to backlit ligh does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Diffusively reflecting shield optically, coupled to backlit ligh, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffusively reflecting shield optically, coupled to backlit ligh will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-822181