| Summary: | 碩士 === 國立交通大學 === 光電工程學系 === 98 === The Global warming issue has become more seriously in recent years. Therefore, how to reduce the speed of earth damage becomes a hot issue in many research areas. In the display area, field-sequential-color (FSC) technology not requiring color filter was proposed to enhance light transmittance of LCDs. It has some advantages like high image resolution, high color gamut, and low material cost. However, FSC technology has a fatal drawback, color breakup (CBU) phenomenon. CBU phenomenon seriously decreases image quality. Therefore, there are some CBU suppression method were proposed. However, those methods also have some issues like low LC response time.
Therefore, our group proposed 240Hz, 180Hz Stencil-FSC methods and Two-color-field method to suppress CBU, however, the 180Hz Stencil-FSC method has a minor issue, color distortion.
In this thesis, the “adaptive base 180Hz Stencil-FSC method” was proposed to reduce color distortion of 180Hz Stencil-FSC method. By determining the dominant color of first field, the color distortion was much reduced to average ΔE00<1. The relative CBU was reduced to 59% of conventional RGB-FSC method. Furthermore, the adaptive base 180Hz Stencil-FSC method was verified in a 46” 120Hz MVA-LCD and made CBU almost imperceptible.
On the other hand, this thesis also proposed RGBW 4-in-1 LEDs backlight system to further reduce the power consumption of FSC-LCDs. The gray/white part of image was generated using high efficiency white-light LED instead of low efficiency RGB LED. The remaining color part was generated using RGB LED. By this way, the power consumption of FSC-LCDs was further reduced. However, the two-color-field method could not reduce power with RGBW 4-in-1 LEDs because there were only two primary colors in each field. Therefore, this thesis modified the algorithm to be 120Hz Stencil-FSC method by making first field become a multi-color single field. Then 240Hz, adaptive base 180Hz, and 120Hz Stencil-FSC methods were applied on RGBW 4-in-1 LEDs backlight system and reduced optical power to 62%, 52%, and 24% of conventional RGB-FSC method respectively. Therefore, the Stencil-FSC method with RGBW 4-in-1 LEDs backlight system provide high image quality with low power consumption.
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