15 October 2012 Transparent image generator by using vertically aligned polymer-stabilized liquid crystal (VA-PSLC) for see-through display applications
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Abstract
We demonstrate the feasibility of using a Vertically-Aligned Polymer-Stabilized Liquid Crystal (VA-PSLC) film, which is also known as LC gel, as a transparent image generator to form a see-through display system. This is achieved, in its simplest form, by projecting a collimated LED light source onto a transparent glass screen, with the image generated by the scattered light from the VA-PSLC. By moving the observer’s head slightly away from the incident light specular reflection direction, a clear image can be observed on the transparent glass screen together with the background objects that are behind the screen. From our experimental results, this see-through display system using VA-PSLC transparent image generator can achieve a fast response time (with rise time of ~10 ms and fall time of ~5ms) and an acceptable contrast ratio (< ~100:1). The driving voltage is about 15~20V. Further improvements can be achieved by further optimizing the LC material/monomer parameters, device fabrication process/conditions and the optical system setup. In this system, polarizers are not required so that very high light efficiency can be obtained.
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Mu-Hao Wang, Wing-Kit Choi, and Guo-Dung Su "Transparent image generator by using vertically aligned polymer-stabilized liquid crystal (VA-PSLC) for see-through display applications", Proc. SPIE 8484, Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting, 848414 (15 October 2012); doi: 10.1117/12.930935; https://doi.org/10.1117/12.930935
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