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Electro-Optical Engineering
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Introduction
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Due to the high concentration of the electro-optical industries in the Southern Taiwan Science Park, we established a six-person Electro-Optical Team at our Southern Taiwan Business Unit. Their mission is to assist in the innovation and development of Southern Taiwan's electro-optical industry. The Electro-Optical Team focuses on the development of Computer Aided Design/Computer Aided Engineering (CAD/CAE) software for electro-optical devices. Their research topics include the design of backlight modules, color analysis of mixing pastes, and the design of optics for camera modules. We believe that their efforts will add to the competitiveness of electro-optical-based companies in the Southern Taiwan Science Park.
Liquid crystal displays (LCD) are widely used in plasma televisions, computer monitors, cellular phones, and personal digital assistants (PDA). Since the liquid crystals used in the manufacturing of LCDs are not light-emitting devices, a “backlight” is needed to make images viewable.
Because of the increased demand for consumer products that utilize LCDs, there is a corresponding increase in the demand for backlight modules. The time required to introduce new LCD products into the market can be minimized if a generic backlight module design is available.
In 2004, we developed several light guide dot pattern distributions using optical simulation software. These distributions are used in the edge lighting backlight module. Our backlight module designs have been successfully incorporated into cellular phones as well as computer monitors. The design to manufacturing process of the devices using our design approach took only one month.
A LCD's performance is based not only on its brightness but also its color fidelity. Although LCDs cannot show all the colors seen in nature, NCHC's Electro-Optical Team was able to increase its range of viewable colors by mixing different percentages of the primary colors via the red, green, and blue light color filters. If the color filters are located at the correct coordinates, vibrantly colorful images are displayed.
Our research found that the color paste dominates the color coordinate on the color filter. We also found that the color paste mixing process takes too much time in matching the correct primary color percentages. We used colorimetry to develop a color prediction system that generates correct color mixing percentages and, thus, the correct color coordinate efficiently. This research has further shortened the design-to-manufacturing process from one month to just a few days.
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