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3 February 2009 A new of type holographic display based on a wedge-shaped waveguide and its keystone predistortion
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The wedge display is a piece of wedge-shaped waveguide. Each time a ray reflects in the wedge, its angle relative to the opposite side increases so that the critical angle is eventually reached and the ray emerges. Therefore, how far the ray travels before emerging is determined by its injection angle. As a kind of projection display, the wedge-shaped waveguide is a natural fit to holographic projection. In this paper, a new type of holographic display based on the wedge panel is reported. The hologram projected into the wedge is generated by computer with a Spatial Light Modulator (SLM 1280*1024), illuminated by a He-Ne laser. A method taking advantage of reverse ray tracing to correct keystone distortion of the wedge display is introduced. By setting special patterns on the screen of the wedge panel and replacing the projector at its thick end with a camera, keystone distortion information is recorded. The predistortion process adds the distortion pattern from the camera to the original input images. Images with less distortion are shown on the screen after the predistortion process.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shunyi Tan, Kuan Wen Chen, Adrian Travis, and Tim Wilkinson "A new of type holographic display based on a wedge-shaped waveguide and its keystone predistortion", Proc. SPIE 7232, Emerging Liquid Crystal Technologies IV, 72320V (3 February 2009);

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