Image Quality Assessment of Large UHD LCDs using Quantum Dot and RGBW Technologies

• Main Authors: Chia-Wei Hsu, 許家瑋
• Other Authors: Hung-Shing Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/98583064690329080968

碩士 === 國立臺灣科技大學 === 電子工程系 === 103 === This purpose of this paper is to explore image quality of the displays which Quantum Dot and RGBW technologies are used, to compare their image quality performances. There are 4 different principles of light emitting displays are evaluated in this paper. Among them, two displays with backlight sources (white LED and quantum dots white LED) and the other two with color filters (RGB and RGBW). Experiment 1 is designed to measure physical characteristics of the 4 LCD displays. The physical characteristics are tone response curves (red/green/blue/neutral colors), correlative color temperatures (CCTs) of gray tracking and color gamut. Experiments 2 and 3 are psycho-visual experiments. The experimental data is analyzed by Pair Comparison. Experiment 2 uses 14 test images and 9 evaluation projects to evaluate the 4 LCD displays. Experiment 3 explores how do the conditions that keeping the same hue with different chroma and lightness settings affect the image quality performances. The results showed that quantum dots display could offer larger color gamut which can display a wider range of colors. Quantum dots display can effectively reduce the high color temperature caused by its light leakage during low level signal. Quantum dots display is suitable for viewing images with low-chroma and high-lightness, whereas it may be more unnatural when the images are close to high-chroma. Overall, the image quality of quantum dot LCD display is better than the general LCD display.