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Laser displays have been investigated by engineers and scientists since shortly after the invention of the laser. The majority of these systems have been based on gas lasers or lamp-pumped solid-state lasers which are expensive, large in size, and require significant cooling systems. Due to these negative attributes, laser disp1ays have been limited to applications which are not sensitive to size or cost. Recent advances in compact, air-cooled, diode-pumped, solid-state, visible microlasers have enabled the development of portable laser displays. Lasers are under development for both "backlit" displays, where the lasers replace arc-lamps in an LCD/DMD projector, and "direct-write" displays, where the image is formed by directly modulating and scanning the laser beam. Compact, multi-watt RGB laser modules have been demonstrated for use as "light engines" in projection displays generating greater than 500 ANSI lumens. Advantages of microlaser-based displays include large color gamut, color accuracy, image uniformity, high resolution, large depth of focus, and low maintenance due to the long lifetime (> 10,000 hours) of the lasers. These advantages make them attractive for near term applications such as simulators, command and control centers, high end CAD workstation monitors, and longer term applications such as electronic cinema.

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We consider the application of real-time storage at full digital video rates. Traditional optical recording systems utilizing binary runlength limited coding, cannot support the coding density required for the data rates and capacities. New optical recording channels [1], have been developed that support non-binary, M-ary (M≥3) coding. In this paper we consider linear optical recording media (such as demonstrated by Optex’s proprietary stimulable phosphor material called Electron Trapping Optical Media, ETOM™) and the system design (see Figure 1) to support the full digital video rate. The system uses a new class of runlength limited M-ary codes, that was constructed using a modified version of the state splitting algorithm due to Adler Coppersmith Hassner[2], These codes increase (by 2-3 times) the data rate and storage density on the disk and improve on the minimum squared Euclidean distance to provide coding gains of up to 1.9 dB above Ungerbock-style trellis codes used for amplitude modulation.