Holographic diffuser for back-lit display

Details Holographic diffuser for back-lit display Holographic diffuser for back-lit display

1993-05-14

1995-11-28

Ben, Loha

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 30, 359 49, 359 50, 359599, 362 97, 362223, 362260, G02B 532

Patent

active

054713277

ABSTRACT:
A holographic diffuser for use in conjunction with a back-lit flat-panel display and a source of illumination in the form of one or more tubular lamp segments is recorded so as to receive light from the lamp segments and scatter it preferentially along a plane perpendicular to the axis of the bulbs. In a back-lit display having vertically oriented tubular lamps, the diffuser scatters substantially more in the horizontal dimension, thus filling in the gaps of light intensity between the bulbs, which would otherwise be viewed by an observer, as with conventional diffusers. The high aspect ratio diffusers of the present invention are preferably formed by projecting coherent radiation through a mask having dimensions functionally related to the desired final aspect ratio, with an optional collimating lens being used to project that mask to infinity. A contact exposure process is also described.

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