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46.4: Pixel‐Wise Intensity Compensation for Locally Dimmed Backlight Displays Based on an Objective Metric
Author(s) -
Tasli H. Emrah,
Sayinta Murat,
Alatan A. Aydin
Publication year - 2011
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3621413
Subject(s) - backlight , intensity (physics) , compensation (psychology) , pixel , liquid crystal display , rgb color model , computer science , metric (unit) , computer vision , optics , artificial intelligence , physics , engineering , psychology , operations management , psychoanalysis
Abstract In this paper, a novel pixel compensation technique for Led backlight displays is proposed. The proposed technique explicitly computes the screen intensity distribution using the point spread function (PSF) of the individual Led groups to calculate per‐pixel‐based intensity decrease due to the dimmed Leds. The intensity of LCD values from 0 to 255 for RGB channels are measured to compensate intensity decrease due to dimming operation. In order to keep emitted intensity through each pixel for each RGB channel constant, the proposed method matches the original intensity distribution using an objective comparison metric. The implementation has been validated on Vestel Pixellence Led TV to achieve approximately 5M:1 dynamic contrast ratio.