Illumination system employing an array of microprisms

Details Illumination system employing an array of microprisms Illumination system employing an array of microprisms

1995-02-24

1996-09-10

Fahmy, Wael M.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 42, 359 48, 359 49, 359 69, G02F 11335

Patent

active

055551092

ABSTRACT:
An optical illumination system comprising a waveguide that accepts light generated by a diffuse light source and transmits the light via total internal reflection. Attached on one face of the waveguide is an array of microprisms, with each microprism having an light input surface parallel to a light output surface and at least two sidewalls tilted at an angle from the direction normal to the surface of the waveguide such that light escapes from the waveguide, reflects off the tilted sidewalls and emerges from the microprism as a spatially directed light source. An array of microlenses may be positioned to accept the output of the microprisms so that the light exiting from the microlenses is a substantially collimated light source. The optical illumination system is advantageous for any application that requires a non diffuse or substantially collimated that is both energy efficient and contained in a low profile assembly.

REFERENCES:
patent: 5040878 (1991-08-01), Eichenlaub
patent: 5126882 (1992-06-01), Oe et al.
patent: 5151801 (1992-09-01), Hiroshima
patent: 5206746 (1993-04-01), Ooi et al.
patent: 5329386 (1994-07-01), Birecki et al.
patent: 5396350 (1995-03-01), Beeson et al.
IBM Technical Disclosure Bulletin, vol. 33, No. 9, Feb. 1991; High Efficiency Back Light For LCD.

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