Liquid crystal light valve projector for shipboard use

Ronald S. Gold

doi:10.1117/12.959437

8 October 1980 Liquid crystal light valve projector for shipboard use

Ronald S. Gold

Proceedings Volume 0250, Optomechanical Systems Design; (1980) https://doi.org/10.1117/12.959437
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

A projection display system incorporating a CRT driven liquid crystal light valve has been designed for use on various types of naval vessels. The projection unit can be used in either a horizontal plotter configuration or a vertical large screen display. It has been designed to withstand the rigorous environmental requirements of surface ship and submarine applications. The totally water cooled projector consists of two principal optical subsystems, the illumination optical system and the projection optics. Common to both subsystems is the polarizing beamsplitting prism which acts as both polarizer and analyzer. Since the light valve operates in linearly polarized light, extreme care has been taken in mounting the prism such that undue stress is not induced in the glass while at the same time maintaining the integrity to withstand all shock and vibration requirements. Excessive force on the prism leads to stress birefringence which causes contrast degradation and non-uniformity in the projected image. In addition to the prism, the illumination subsystem includes a replaceable prealigned, prefocussed, 550 watt, water-cooled xenon arc lamp module, and optical elements to relay the light to the light valve. The light valve, being a reflective device, then directs the energy through the projection optics. To minimize cabinet size in the horizontal plotter and bulkhead to screen distance in the vertical display, a wide angle folded projection lens was required. Attenuation of light output and night adaptation is accomplished with the use of neutral density and red filters. Operator controls such as light output, focus, centering, and scaling can be remotely actuated.

Citation Download Citation

Ronald S. Gold "Liquid crystal light valve projector for shipboard use", Proc. SPIE 0250, Optomechanical Systems Design, (8 October 1980); https://doi.org/10.1117/12.959437

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KEYWORDS

Light valves

Liquid crystals

Projection systems

Prisms

Lamps

Birefringence

CRTs

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