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Journal of Display Technology

Journal of Display Technology


  • Vol. 4, Iss. 2 — Jun. 1, 2008
  • pp: 139–146

Dynamic Backlight Gamma on High Dynamic Range LCD TVs

Fang-Cheng Lin, Yi-Pai Huang, Lin-Yao Liao, Cheng-Yu Liao, Han-Ping D. Shieh, Te-Mei Wang, and Szu-Che Yeh

Journal of Display Technology, Vol. 4, Issue 2, pp. 139-146 (2008)

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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 ${\hbox{37}}^{\prime\prime}$ HDR-LCD TV with 8$\times$8 backlight zones, the image contrast ratio can reach $\sim{\hbox{20}}{\thinspace}{\hbox{000:1}}$ while maintaining high brightness, clear image detail, and an average power reduction of 30%.

© 2008 IEEE

Fang-Cheng Lin, Yi-Pai Huang, Lin-Yao Liao, Cheng-Yu Liao, Han-Ping D. Shieh, Te-Mei Wang, and Szu-Che Yeh, "Dynamic Backlight Gamma on High Dynamic Range LCD TVs," J. Display Technol. 4, 139-146 (2008)

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