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30 March 2001 Electrically switchable Bragg grating technology for projection displays
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Abstract
DigiLens Inc. (Sunnyvale, California) has developed the Application Specific Optical Element (ASOE) based on Electrically Switchable Bragg Gratings (ESBGs) using an advanced Holographic Polymer Dispersed Liquid Crystal material system. One of the embodiments of this fundamental technology is a customizable white light color sequential filter system which aims to replace traditional color wheel assemblies in microdisplay-based display applications such as business projectors, HDTV and large computer monitors. ASOEs are essentially stacks or laminates of intrinsically thin ESBGs encapsulated using transparent substrates. ASOEs have no moving parts; they are completely solid state and silent in operation. They offer the benefits of holographic optical elements in terms of being able to compress conventional optical systems into compact and lightweight form factors. Their switching speed is fast enough for color sequential display applications. They will have a major impact on the complexity and cost of a broad gamut of microdisplay applications, including projection and near- eye. This paper reviews the role of reflective ASOE filters in projection systems, with reference to design concepts currently in development.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephen F. Sagan, Ronald T. Smith, and Milan M. Popovich "Electrically switchable Bragg grating technology for projection displays", Proc. SPIE 4294, Projection Displays VII, (30 March 2001); https://doi.org/10.1117/12.420788
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