Accession Number : ADD012658

Title :   Real-Time Ultra-High Resolution Image Projection Display Using Laser-Addressed Liquid Crystal Light Valve.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Trias,John

Report Date : 09 Sep 1986

Pagination or Media Count : 13

Abstract : A wide screen display enables a number of viewers the simultaneous viewing of rapidly updated data in real time at video rates. A beam of coherent radiation from a laser is modulated at video rates in an acousto-optic modulator. The modulated beam is fed to an X scanner that imparts an acoustooptic displacement of the modulated beam in the X direction. A Y scanner is aligned to receive the X-scanned modulated beam and imparts an acoustooptic reciprocal displacement of the beam so that the video modulated beam is displaced in both the X and Y directions. A liquid crystal light valve is disposed to receive the X and Y displaced modulated beam so that it scans the surface of the light value to stimulate the photosensor layers within. This causes the impression of a replica voltage pattern on a bi-refringent liquid crystal in the valve. A high intensity lamp projects a high intensity incoherent light beam onto the liquid crystal light valve via a polarizing biprism. The acoustooptic modulation X scan and Y scan occur at much higher rates and with greater control than conventional arrangements so that the resolution of two about 2,000 lines at a video rate is possible. The real-time display provides a number of viewers with a more realistic image so that responsive decisions and actions may be taken.

Descriptors :   *PATENTS, *ACOUSTOOPTICS, *BIREFRINGENCE, *LIQUID CRYSTALS, *DISPLAY SYSTEMS, DISPLACEMENT, LIGHT MODULATORS, LIQUID CRYSTALS, LASERS, KERR CELLS, MODULATION, COHERENT RADIATION, HIGH RATE, LIGHT, DATA RATE, VIDEO SIGNALS, VIEWERS, REAL TIME, PATTERNS, REPLICAS, VOLTAGE, RATES, SCREENS(DISPLAYS), PHOTODETECTORS

Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE