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XEROX DEMONSTRATES 6.3 MILLION-PIXELACTIVE MATRIX LIQUID CRYSTAL DISPLAYS

 Flat Screen Produces Laser-Quality Image
 PALO ALTO, Calif., May 13 /PRNewswire/ -- Scientists at Xerox


Corporation's (NYSE: XRX) Palo Alto Research Center (PARC) have developed two flat-screen active matrix liquid crystal displays (AMLCDs) that produce images with resolution equivalent to a high-quality laser- printed document.
 The color and black-and-white flat-screen displays, with 6.3 million dots of resolution (pixels or subpixels) are believed to be the highest pixel-count AMLCDs reported to date -- comparable to about 300 dot-per- inch (dpi) printing.
 The Xerox displays are being shown for the first time next week May 19 at the 1993 Society for Information Display (SID) International Symposium, Seminar and Exhibition at the Washington State Convention Center in Seattle.
 PARC's 13-inch diagonal monochrome AMLCD has a pixel format of 3,072 vertical columns by 2,048 horizontal rows, and offers approximately 20 times the pixel count of a typical 13-inch monochrome desktop computer display with a VGA pixel format of 640 by 480.
 The color display uses the same active matrix array designed for the monochrome AMLCD. It is comprised of 1.6 million pixels (6.3 million subpixels) in a color pixel format of 1536 by 1024, and incorporates a color filter with a quad-green (Red-Green-Blue-Green) configuration.
 Both the monochrome and color AMLCDs were originally designed for an internal Xerox research and development requirement and are not available as commercial products. Potential applications include office automation, as well as areas ranging from document preview displays for "What-You-See-Is-What-You-Get" (WYSIWYG) desktop publishing to engineering workstation applications.
 Development was co-funded by the federal government's Advanced Research Projects Agency (ARPA) under its High-Definition Systems (HDS) program. Both displays use conventional AMLCD amorphous silicon (a-Si) thin film transistor (TFT) technology with binary (on-off) pixel operation to produce high-resolution, laser-quality images. Exploiting well-established techniques similar to those used in printing, and the display's very high pixel count, quality gray-scale images can be rendered by means of spatial dithering, or mixing pixels of available colors or gray shades.
 PARC scientists overcame several challenges in achieving and demonstrating state-of-the-art AMLCD performance.
 "One hurdle was yielding the high-density, high pixel count displays on large area (320mm by 340mm) glass substrates," said Malcolm J. Thompson, director of the PARC laboratory that developed the displays. "The 6.3 million-pixel active matrix TFT array incorporates 1.1 kilometers of interconnect lines in the page-size area of the display."
 Achieving the fine pitch interconnect density required for the displays' row and column drivers was another challenge. Because integrated circuit drivers with the performance necessary to drive the displays were not available as off-the-shelf components, PARC opted to design and build its own multichip module (MCM) drivers using available high-speed driver die.
 In addition, PARC developed supporting hardware and software to accommodate the high information content and system bandwidth required to operate the displays.
 -0- 5/13/93
 /CONTACT: Kathy Middo of Xerox PARC, 415-812-4508; or Jeff Simek of Xerox Corporation, 716-423-5230/
 (XRX)


CO: Xerox Corporation ST: New York, California IN: CPR SU:

BM -- CL002 -- 7948 05/13/93 09:04 EDT
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Date:May 13, 1993
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