Patent
1988-07-05
1990-10-02
Bovernick, Rodney B.
350 377, 350 385, G02B 532
Patent
active
049603140
ABSTRACT:
An optical screen module for full-color, on axis viewing is described. The module has a transmission holographic optical element, a louver filter, and a diffraction optics diffusion screen. Input light is diffracted off-axis by the transmission holographic element, passed through the louver filter and rediffracted on-axis by the diffusion screen. The module can handle full-color light because the dispersion in the transmission hologram is compensated by that in the diffusion screen. The louver filter blocks the undiffracted zero-order light while allowing the light diffracted by the transmission hologram to pass through.
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Hegg Ronald G.
Smith Ronald T.
Alkov Leonard A.
Bovernick Rodney B.
Denson-Low Wanda K.
Hughes Aircraft Company
Shafer R. D.
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