Study of Backlighting System with Angular Modulation

• Main Authors: Chang, Chi-Hsien, 鍾積賢
• Other Authors: Tien, Chung-Hao
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/08488716160895975940

碩士 === 國立交通大學 === 顯示科技研究所 === 97 === Aim at the concept of the Ultra-Low Power Eco LCD System, a smart planar backlighting system with high optical efficiency was proposed. The novel backlight system is composed of a light emitting diode (LED) array and cylindrical Fresnel lens. This lens can exhibit flexibility on angular distribution of the emitting optical field. In this thesis, the opto-mechanism setup and the niches of a backlight system would be introduced, discussed how to provide the normal and oblique viewing modes via controlling the LEDs individually. Furthermore, issues of the backlight system on angular distribution and uniformity would be optimized. In addition, the display subject to the above backlight module could reduce the power consumption and improve the economic efficiency by adjusting the LED power ratio. According to the observer’s direction, a viewing switchable backlight can be modulated with different angular distribution.