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12 February 1980 Ultrahigh-Resolution Graphic Data Terminal
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An ultra-high resolution multicolor graphic data terminal is being developed for use in acquisition and exploitation of high density graphical data. The system consists of three storage mode smectic liquid crystal data cells with laser addressing and projection readout. The projected graphical data is superimposed by rear projection onto a common 24 x 32 inch viewing/working surface. A multicolor format is achieved by projecting data from the three cells in three primary colors, thereby producing seven distinguishable composite colors. Each data cell contains 6000 x 8000 addressable pixels for a total memory capacity of 48 x 106 memory locations per cell. The total data capacity of the system is 144 x 106 pixels. A galvanometer mirror deflection system controlled by a beam position sensing feedback loop is used to position the focused 1.06 μm laser writing beam to an accuracy of .006%. The beam position sensing system is relatively insensitive to variations in signal levels and can sense the deflected beam position with a 20 MHz bandwidth. The laser scanning focus lens is an f/8 telecentric design and produces a 4 inch diagonal format with 10,000 TV line resolution and lateral color distortion of less than 0.0002 inches for both the writing laser wavelength at 1.06 μm and the position sensing wavelength at .6328 μm. The three 10X projection lenses have a distortion less than 10,000:1 and can accurately superimpose the images on the viewing screen from the three liquid crystal cells to produce a color graphic display in six colors plus black and white. The imagery can be reversed to produce either a dark field or a bright field display.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael R. Smith, Richard H. Burns, and Robert C. Tsai "Ultrahigh-Resolution Graphic Data Terminal", Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980);

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