Light collection from diffractive displays

Details Light collection from diffractive displays Light collection from diffractive displays

1999-10-13

2000-07-18

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 22, 359 32, 359 33, 359 3, 359613, 349201, 349202, 353 30, 353 31, G02B 532

Patent

active

060915218

ABSTRACT:
A diffractive display system and a method of collecting first order light beams from a diffractive display of the system utilize holographic optical elements (HOEs) to deflect one of two first order diffracted light beams that emerge from each diffracting pixel of the diffractive display, so that the first order diffracted light beams can be separated from the zeroth order light beams. The utilization of the HOEs allows the system to be implemented in a compact optical configuration, without sacrificing any portion of the first order diffracted light. In a first embodiment, the system includes three HOEs that have static diffracting properties that are optimized for red, green and blue lights. For each set of light beams from a diffracting pixel of the diffractive display, the HOEs are holographically configured to deflect only one of the two first order diffracted light beams, such that the deflected first order light beam propagates in the same direction as the other non-deflected first order light beam. In a second embodiment, the system includes three HOEs that have reconfigurable diffracting properties that are also optimized for red, green and blue lights. In a third embodiment, the system further includes a holographic color filter that is comprised of three reconfigurable HOEs to sequentially illuminate the diffractive display with each of the tristimulus color lights.

REFERENCES:
patent: 5745203 (1998-04-01), Valliath et al.
patent: 5801793 (1998-09-01), Faris et al.
patent: 5825448 (1998-10-01), Bos et al.
patent: 5917459 (1999-06-01), Son

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