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Proceedings Paper

A normally black high contrast wide symmetrical viewing angle AMLCD for military head mounted displays (HMDs) and other viewer applications
Author(s): Hiap Ong; Ollie Woodard; Ngwe Cheong; Kun Zhang; Frederick Herrmann; Martin Metras; Colin Reese
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Paper Abstract

We report progress in developing high-contrast, wide symmetrical viewing angle multi-domain vertical alignment (MVA) AMLCD's with a full color SXGA resolution (1280x1024x3 dots). These MVA displays are fabricated with a smooth surface and without either protrusions or an ITO slit-pattern geometry. Intrinsic fringe fields in each pixel control the LC alignment and formation of domains. We have achieved contrast ratios greater than 1000, and symmetrical viewing angles greater than 120 degrees. A 3840x1024 dot array was developed with integrated color pixel filters to create a 1280x1024 color pixel array. The pixel design, display driver operation, and color mosaic were optimized for MVA operation. Pixel shapes were developed to control domain formation and to maximize light transmission using 3-D modeling and test displays. New LC materials were investigated to increase transmission and to minimize voltage drive requirements. Improvements have been made in this MVA liquid crystal display to bring the fabrication process closer to manufacturing. Key results include striation-free displays with spun-on polyimide alignment layers, elimination of boundary stick via pixel design, overall viewing angle improvement with an MVA-matched wide viewing polarizer, and transmission improvements with high delta n LC, cell gap, driving mode, LED and BEF backlight combination. Performance data and specifications for Kopin's color filter MVA and TN displays will be presented with reference to military, industrial, and commercial applications.

Paper Details

Date Published: 18 May 2006
PDF: 15 pages
Proc. SPIE 6224, Helmet- and Head-Mounted Displays XI: Technologies and Applications, 62240Q (18 May 2006); doi: 10.1117/12.668494
Show Author Affiliations
Hiap Ong, Kopin Corp. (United States)
Ollie Woodard, Kopin Corp. (United States)
Ngwe Cheong, Kopin Corp. (United States)
Kun Zhang, Kopin Corp. (United States)
Frederick Herrmann, Kopin Corp. (United States)
Martin Metras, Kopin Corp. (United States)
Colin Reese, Air Warrior, Redstone Arsenal (United States)

Published in SPIE Proceedings Vol. 6224:
Helmet- and Head-Mounted Displays XI: Technologies and Applications
Randall W. Brown; Peter L. Marasco; Clarence E. Rash; Colin E. Reese, Editor(s)

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