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Améliorations d'artefacts sur panneaux LCD

Abstract : Although Liquid Crystal Display (or LCDs) have become a standard in display technology by ousting cathode ray tubes, the image quality, provided by this type of screen, remains below campared to its older counterpart. These visual issues (or artifacts) are characterized by blurring effects and tailing phenomena, resulting from the "LCD response time", as well as the mode of driving the LCD screen, poorly suited to the Human Visual System (artifact called "hold effect"). The work, presented in this thesis memory, makes its contribution in the field of improvement of visual artifacts on LCD panels. Our approach offers not only a mathematical terminology and definitions tailored to the luminance transitions, but also several analytical models for a concise representation of response time. Unlike overdrive techniques, the traditional solutions to reduce response time, the use of mathematical models could drastically reduce the computation time of measurements and easily could be easily adapted to the refresh rate of the LCD panel. Two algorithms for improving artifacts are proposed: one for television sets and LCD monitors, and the second for the small screens of mobile devices. Finally, after this first step, we propose a study of solutions to reduce the hold effect, an artifact independent from response time.
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https://tel.archives-ouvertes.fr/tel-00396368
Contributor : Pierre Adam <>
Submitted on : Thursday, June 18, 2009 - 10:28:54 AM
Last modification on : Thursday, November 19, 2020 - 12:59:47 PM
Long-term archiving on: : Saturday, November 26, 2016 - 9:56:05 AM

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  • HAL Id : tel-00396368, version 2

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Pierre Adam. Améliorations d'artefacts sur panneaux LCD. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00396368v2⟩

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