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19 January 2009 Optimizing color quality for LED backlight modulated LCD TVs
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Proceedings Volume 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications; 72410B (2009)
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States
Large-scale, direct view TV screens, in particular those based on liquid crystal technology, are beginning to use LED (Light Emitting Diode) backlight technology. Conservative estimates show that LED-LCD TVs additional cost will be compensated by reduced power consumption over average operational lifetime. Local dimming not only promises power savings but also improving additional features such as overall image contrast and color gamut. Based on a simplified human visual model with regard to content dependent color discrimination and local adaptation possible tradeoffs with regard to color uniformity, viewing angle, local contrast, and brightness variations are being discussed. Comparing an 'ideal reference' (input to elaborated model) with the output of a tunable model enabled estimating a threshold of artifact visibility for still images as well as video clips that were considered relevant. Overall image quality with regard to dynamic contrast as well as dynamic color gamut, spatially and temporally, was optimized after having obtained visibility thresholds. Finally, some cost functions are proposed that enable optimizing most important color quality parameters.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fritz Lebowsky "Optimizing color quality for LED backlight modulated LCD TVs", Proc. SPIE 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications, 72410B (19 January 2009);


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