Luminance-preserving, parallax-reducing diffuser

Details Luminance-preserving, parallax-reducing diffuser Luminance-preserving, parallax-reducing diffuser

2007-07-31

2009-08-25

Husar, Stephen F (Department: 2875)

Illumination

Light source and modifier

Including reflector

C362S304000, C362S559000, C385S115000

Reexamination Certificate

active

07578606

ABSTRACT:
A diffuser incorporates diffuser elements (10) that each include a waveguide (12) coupled between a concentrator (14) and an inverse concentrator (16). The diffuser (44) may be disposed between a backlight (102) and a modulator (114) in a display (100). Luminance ratios of light rays emitted by a low resolution image-forming backlight (102) toward a high resolution light modulator (114) may be preserved such that, for viewing directions within the display's preferred angular viewing range, an observer perceives no significant change in the luminance of displayed images, irrespective of changes in the observer's viewing direction.

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