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Browsing by Author "Fan-Chiang, Kuan-Hsu"

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    Analog LCOS SLM devices for AR display applications
    (1970-01-01)
    Fan-Chiang, Kuan-Hsu
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    Huang, Shang-Hao
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    Shen, Che-Yung
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    Wang, Hsing-Lung
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    Li, Yuet-Wing
    Liquid crystal on silicon (LCOS) device is a potential candidate for spatial light modulators (SLMs) due to its high resolution and the wide range of tunable phase retardation. Besides the telecom applications, SLM is also very promising for display applications, especially for the augmented reality (AR) displays. In this paper, we will discuss the advantages of analog LCOS SLM compared with the digital one. A 0.6-in short-loop sample test result with precise cell gap controlled is discussed. A fast liquid crystal with high birefringence that attains less than 2.5-ms full-on-full-off response time is also introduced. Regarding the computer-generated hologram (CGH), a new algorithm called multiconstraints angular spectrum algorithm (MASA) is proposed to enhance the image quality of dual-plane holographic projection.
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    Fringing-Field Effects on High-Resolution Liquid Crystal Microdisplays
    (2005-12-01)
    Fan-Chiang, Kuan-Hsu
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    Wu, Shin-Tson
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    Chen, Shu-Hsia
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    光電工程學系
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    Department of Photonics
    Fringing- field effects on high-resolution liquid crystal microdisplay devices, including the reflection-type liquid-crystal-on-silicon (LCOS) and transmission-type poly-silicon thin-film-transistor liquid crystal displays are simulated by the beam propagation method. The electro-optic performances of six commonly used liquid crystal modes are analyzed by the two-dimensional optical simulator. The vertically aligned (VA) cell exhibits the highest contrast ratio, but its fringing-field effect is severe. A circularly polarized light illuminated LCOS device is presented to eliminate the fringing-field effect of the VA cell. Both simulated and confirming experimental results show that the long-standing problems of poor sharpness, low brightness, and slow transition time of the VA cell can be overcome by using a circularly polarized light.