A High Dynamic Range technology for Color-filter Less and Polarizer-free Eco-display

• Main Authors: Hsieh, Yi-Han, 謝毅翰
• Other Authors: Huang, Yi-Pai
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/52922941273015700843

碩士 === 國立交通大學 === 光電工程學系 === 99 === In recent years, the energy concerns are increasing around world. However, the optical throughput of the liquid crystal display (LCD) is less than 10%. The backlight module, the TFT array, the color filter, the polarizers, and the liquid crystals reduce the optical throughput. Moreover, the color filter and the polarizers are the two elements wasting the most light. Thus, lacking the color filter and polarizers, the LCD can enhance the optical throughput to 40%. The FSC-LCD successfully removes the color filter, and the polymer dispersed liquid crystal (PDLC) does not need the polarizers. The thesis will propose an Eco-display. Based on the FSC-LCD and the PDLC concepts, the thesis will propose a High Dynamic Range (HDR) technique, the Contrast Dependent Dimming Method, by using the LED light source to maintain the image quality. The simulation results show the image quality is better with the Contrast Dependent Dimming Method. When the contrast of PDLC becomes lower, the Contrast Dependent Dimming Method modifies the image quality more. Besides, the psychophysical experiment results show that when the contrast ratio becomes lower than 70:1, the human vision system starts feeling the differences. The psychophysical experiment result corresponds to the average ΔE=0.2 and 3% ΔE>3. Moreover, the thesis will further incorporate the 120Hz Stencil-FSC and the white LED. Assuming the efficiency of the white LED is 100lm/w, the Eco-display can further reduce the optical power to 13% of the convention FSC-LCD.