System for illuminating a liquid-crystal screen

Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell

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349 7, 349 95, 359 15, 359583, G02F 11335, G02B 532

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active

058778241

ABSTRACT:
This system for illuminating a liquid-crystal screen comprises a light source which emits an unpolarized light beam (F). A polarizing splitter device (PBS) receives this unpolarized light beam and retransmits, onto the liquid-crystal screen, a first and a second beam (F1, F2) which are polarized in the same polarization direction. The axes of the two beams make a defined angle (2.beta.) between them. A matrix of microlenses is provided with one microlens (.mu.L) for at least two adjacent picture elements (EL1, EL2) in the liquid-crystal screen. Each microlens directs that part of the first beam which it receives onto one (EL1) of the two picture elements and that part of the second beam which it receives onto the other picture element (EL2).

REFERENCES:
patent: 4769750 (1988-09-01), Matsumoto et al.
patent: 5506701 (1996-04-01), Ichikawa
patent: 5548349 (1996-08-01), Mizuguchi et al.
patent: 5737113 (1998-04-01), Kuramochi et al.
Optical Engineering, vol. 32, No. 11, Nov. 1993, Bellingham US pp. 2665-2670 E.A. Watson "Analysis Of Beam Steering With Decentered Microlens Arrays".
Copy of European Search Report.

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