A normally black high contrast wide symmetrical viewing angle AMLCD for military head mounted displays (HMDs) and other viewer applications

Hiap Ong; Ollie Woodard; Ngwe Cheong; Kun Zhang; Frederick Herrmann; Martin Metras; Colin Reese

doi:10.1117/12.668494

18 May 2006 A normally black high contrast wide symmetrical viewing angle AMLCD for military head mounted displays (HMDs) and other viewer applications

Hiap Ong, Ollie Woodard, Ngwe Cheong, Kun Zhang, Frederick Herrmann, Martin Metras, Colin Reese

Author Affiliations +

Proceedings Volume 6224, Helmet- and Head-Mounted Displays XI: Technologies and Applications; 62240Q (2006) https://doi.org/10.1117/12.668494
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

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.

Citation Download Citation

Hiap Ong, Ollie Woodard, Ngwe Cheong, Kun Zhang, Frederick Herrmann, Martin Metras, and Colin Reese "A normally black high contrast wide symmetrical viewing angle AMLCD for military head mounted displays (HMDs) and other viewer applications", Proc. SPIE 6224, Helmet- and Head-Mounted Displays XI: Technologies and Applications, 62240Q (18 May 2006); https://doi.org/10.1117/12.668494

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