The notion ofusing a laser CRT as monochromatic light source for passive display technologies is discussed. Optimism
for such an application is based on the high efficiency (more than O %) of "red" lasers obtained in GaInP/AlGaInP
multi-quantum well (MQW) structures. A miniature vacuum tube designed as a light source is presented. Technological
issues of achieving high efficiency in green and blue using wide band gap II-VI compound MQW structures is also
presented. To date, maximum output power of 3.2 and 1 W was achieved at wavelengths of 535 and 462 nm respectively
under longitudinal pumping by an electron beam with electron energy of 4O keV at room temperature.
An electron beam pumped vertical cavity laser, or an “eVCSEL”, has been developed as a low-cost light source for LCOS and DLP based consumer television. 1000 lumens directed towards the spatial light modulator requires a total power of 144 watts for lasers in the three primary colors. This power surplus allows for high screen brightness for rear projection televisions of diagonals greater than 50 inches and eliminates the need for high gain screens with the benefit of larger viewing angles. Because of the high saturation of laser light, a color gamut approaching that of the human visual system is possible, creating superior image reproduction.
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