| Summary: | 碩士 === 國立交通大學 === 顯示科技研究所 === 99 === In display applications, flexibility will be a trend in the future due to the features like compactness and portability. As a mature technology, LCD has the potential for development in flexible display. However, the transmissive LCD requires the backlight for operation. Nowadays, several kinds of flexible backlight suffer from low luminance uniformity or low optical efficiency.
In this thesis, the flexible backlight was proposed to maintain the luminance uniformity by bending-loss prevention. The light guide is designed to permit light propagating parallel to bending axis by parabolic TIR reflector. The parameters of light guide, including the parabolic TIR reflector and the v-cut out-coupler, were optimized by optical simulation tool. The prototype of light guide was fabricated by laser cutting and diamond turning to verify the concept. From the experimental results, the 1D uniformity from the normal of light guide could successfully kept over 80% in both flat case and bending case, which the radius of curvature could reach 50mm. Additionally, the luminance difference (error function) between in flat case and bending case is lower than 10%. Moreover, the luminance angular profile applied remote phosphor technology is uniform so that the luminance spatial profile in real case perceived by human eyes is also uniform. Therefore, the flexible backlight with bend-loss prevention has the potential to be applied in flexible LCD.
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