High efficiency projection displays having thin film...

Details High efficiency projection displays having thin film... High efficiency projection displays having thin film...

G - Physics

02

B

G02B 27/00 (2006.01) G02B 27/26 (2006.01) G02B 27/28 (2006.01) G02F 1/1335 (2006.01) H04N 5/74 (2006.01) H04N 9/31 (2006.01)

Patent

CA 2183188

A projection display system includes a thin film polarizing beam splitter/combiner has first and second light transmissive substrates in the form of prisms and a plurality of thin film layers disposed between the prisms. The thin film layers and have predetermined thicknesses and refractive indices which allow unpolarized incident light to be separated into s-polarized and p-polarized light beams. Both frustrated total internal reflection and thin film interference are simultaneously employed to allow s-polarized light to be transmitted and p-polarized light to be reflected over a wide range of wavelengths and angles of incidence. The device further includes two spatial light modulators for encoding an image to be projected. By providing a different signal to each spatial light modulator, a 3 dimensional display results.

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