Research of mixed-light control and uniformization for RGB-LED backlight module

• Main Authors: Shih-Chin Tung, 童世欽
• Other Authors: 張永農
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/t7t688

碩士 === 國立虎尾科技大學 === 電機工程研究所 === 97 === In this thesis, light emitting diodes with red, green, and blue lights, respectively, are served as the back-light source and employed to generate the three primitive colors that could be adjusted and mixed to realize the output of white light. With the introduction of the techniques, by using the power factor correction and forward converter, a 35 watt DC/DC converter was developed to prevent the color deviation due to instable voltage of the variation load to stabilize the output of white light. The feature of light-emitting diodes is found to be susceptible to temperature which causes color deviation and the value of chromaticity coordinates can not be stable. To prevent the output white light from being experienced with color deviation due to temperature effect on the performance of LED, a mixed-light circuit module is developed by integrating PSoC. By utilizing the developed mixed-light backlight source control system, a module assembly concept is used to develop a large-sized backlight-source module. Eventually, the uniformity of large-size backlight-source can be optimized and the application of RGB LED on large-size LCD can be realized.