| Summary: | 碩士 === 國立中興大學 === 光電工程研究所 === 102 === In the recent years, with the raise in standard of Liquid Crystal Display (LCD) thin module, thin design becomes indispensable in the manufacturing process. Therefore, the back light module industry demands stricter design in thin light guide plate. While injecting thin light guide plate, high injection speed and molding pressure are required, so the remained residual stress often causes the plate transformed and warped. To resolve this, we can apply the properties of ink-jet printing, drop-on-demand and direct writing. By introducing these properties, no microstructure mold and stampers are fabricated, so the development period and cost can be reduced dramatically.
In this paper, we will introduce printing materials, surface treatment of primer coating, parameter optimization of printing microlens, optimal design and product verification. With Miyakawa MLP-850UV, ink-jet printing process is used to manufacture micro lens array light guide plate, and establish the complete process. In our design, we adopted UV polyacrylamide, optimized ink-jet printing, 22V driving voltage, and 0.8mm substrate gap. After the first printing process and the hydrophobic layer with primer coating, we proceed with the second printing process on the substrate to form the micro lens array.
13.3" machines is operated with optical design, to control the micron lens of 70μm in diameter, 14um in height, and 0.539 coverage. Film size of hydrophobic layer primer is controlled by 0.723μm in thickness and 1.509 refractive index. With ink-jet printing technique, we can successfully manufacture 13.3" ink-jet light guide plate with 2419.18 nit luminance and 87.84% luminance uniformity in average. The experiment result validates the ability of Ink-Jet printing process in manufacturing thin light guide plate.
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