Dynamic Backlight Gamma on High Dynamic Range LCD TVs |
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| Authors: | Fang-Cheng Lin Yi-Pai Huang Lin-Yao Liao Cheng-Yu Liao Shieh H.-P.D. Te-Mei Wang Szu-Che Yeh |
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| Affiliation: | Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu; |
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| Abstract: | A high dynamic range liquid crystal display (HDR-LCD) can enhance the contrast ratio of images by utilizing locally controlled dynamic backlight. We studied the HDR-LCD as a dual-panel display: a backlight module and a liquid crystal (LC) cell. As the gamma of the LC signal, the backlight module was also endowed with a gamma function to control the contrast ratio of HDR images. The inverse of a mapping function (IMF) method proposed as a dynamic gamma mapping curve for the backlight module, has been demonstrated to further improve in HDR image quality. By implementing the IMF method on a HDR-LCD TV with 88 backlight zones, the image contrast ratio can reach while maintaining high brightness, clear image detail, and an average power reduction of 30%. |
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