Diffraction optics diffusing screen laminate for full color on-axis viewing

Patent 4960314 Issued on October 2, 1990. Estimated Expiration Date:

July 5, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Application

No. 214986 filed on 07/05/1988

US Classes:

359/15, Using a hologram as an optical element359/443PROJECTION SCREEN

Examiners

Primary: Bovernick, Rodney B.
Assistant: Shafer, Ricky D.

Attorney, Agent or Firm

Alkov; Leonard A., Denson-Low; Wanda K.

International Class

G02B 005/32

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.