Collimated fluorescent backlights for LCD direct viewing

Jack R. Biles

doi:10.1117/12.151215

13 August 1993 Collimated fluorescent backlights for LCD direct viewing

Jack R. Biles

Proceedings Volume 1911, Liquid Crystal Materials, Devices, and Applications II; (1993) https://doi.org/10.1117/12.151215
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States

Abstract

The TSTN^TM (triple super twisted nematic) LCD is a successful method for obtaining color by stacking three panels, each of which subtracts out a primary color. Because the individual pixels of the three panels must line up to form one fully colored pixel, collimated light is needed. Incandescent lamps are easy to collimate, but are not as popular as fluorescent lamps in the display industry because of poorer efficacy, lifetimes, and color saturation. Fluorescent lamps are inherently diffuse sources that are difficult to collimate. By covering the inside of a hot cathode fluorescent lamp with a reflective MgO layer, small apertures can be made as bright as 50,000 foot lamberts. Individual lenses, centered on each aperture, can collimate these apertured sources.

Citation Download Citation

Jack R. Biles "Collimated fluorescent backlights for LCD direct viewing", Proc. SPIE 1911, Liquid Crystal Materials, Devices, and Applications II, (13 August 1993); https://doi.org/10.1117/12.151215

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