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Browsing by Author "Chen, Jerry"

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    Optical Properties of Visible-light Excited Phosphor Sheet (VEPS) System
    (2009)
    Xiao, Bo-Wen
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    Hung, Chien-Hsiang
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    Huang, Hsin-Tao
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    Huang, Yi-Pai
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    Tien, Chung-Hao
    The optical properties in Visible-light Excited Phosphor Sheet (VEPS) system were discussed and calculated. Different to the conventional LED backlight with white LEDs, VEPS system applies blue LED chips to excite the extrinsic flat YAG-phosphor layer to perform uniform and flat lighting, that can further reduce the backlight thickness. A theoretical model was developed to optimize the structure of VEPS system. Consequently, the optimized result was demonstrated on the small-sized VEPS module.
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    Phosphor Conformal Coating by a Novel Spray Method for White Light-emitting Diodes as Applied to Liquid-crystal Backlight Module
    (2009)
    Huang, Hsin-Tao
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    Tsai, Chuang-Chuang
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    Huang, Yi-Pai
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    Chen, Jerry
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    Lin, Jeremy
    This work presents a novel pulsed spray process (PSP) for the conformal coating of yellow YAG:Ce(3+) phosphor on blue InGaN-based light emitting diodes (LEDs) for TFT-LCD backlight applications. This new approach exhibits much greater color spatial uniformity than conventional white LEDs coated with YAG phosphor by dispensing method. Unlike conformal coating by electrophorestic deposition (EPD), this new phosphor coating scheme of PSP represents an environmental friendly solution without Cr ion pollution. Additionally. PSP can be combined with an array blue chips on board (COB) in a manner that is compatible with large-area processing with high manufacture throughput, and can reduce the costs of TFT-LCD backlight applications.
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    UV excited flat lighting (UFL) system for LCD-TV backlight application
    (2008)
    Huang, Hsin-Tao
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    Hung, Chien-Hsiang
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    Huang, Yi-Pai
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    Tien, Chung-Hao
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    Tsai, C. C.
    Different to the conventional visible-CCFL backlight, UV excited flat lighting (UFL) applies UV-CCFL to irradiate 254 nm wavelengths to excite extrinsic phosphor layer to perform uniform and flat lighting for LCD-TV applications. UFL can yield longer life time due to less phosphor damage. Additionally, high color rendering, minor color deviation, wider FWHM (Fall width at half maximum) angle, and better lamp mura relaxation, were demonstrated to achieve a high quality display with slim backlight module.