Device for the projection of images using two orthogonal components of light polarization
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United States of America Patent
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Jan 19, 1993
Grant Date -
N/A
app pub date -
Aug 2, 1991
filing date -
Aug 10, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is an image projector in which a spatial modulation of light is carried out on the two orthogonal components of polarization of light in order to increase the luminous efficiency of the projector. The image projector of the invention includes a light source, a projection screen, a splitter of polarizations splitting the light into two polarized beams having complementary polarizations, two mirrors reflecting the two polarized beams, firstly so as to give them opposite directions and superimpose them on one and the same axis on which a spatial light modulator is positioned and, secondly, to make them pass again through the polarization splitter by which they are superimposed on one and the same axis with one and the same direction and oriented towards the projection screen and/or the light source as a function of their modulation by the spatial modulator.
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