Ki Duk Kim

P-25: Acceptable Motion Blur Levels of a LCD TV Based on Human Visual System

Visual perception experiments were conducted to determine the limits of motion blur at moving pictures. The results showed that the Blurred Edge Width(BEW) of moving pictures should be below 3.4pixels (visual angle 4.2′) at 3H distance in a living room environment.

Minimization of color shift generated in RGBW quad structure

The purpose of RGBW Quad Structure Technology is to realize higher brightness than that of normal panel (RGB stripe structure) by adding white sub-pixel to existing RGB stripe structure. However, there is side effect called color shift resulted from increasing brightness. This side effect degrades general color characteristics due to change of Hue, Brightness and Saturation as compared with existing RGB stripe structure. Especially, skin-tone colors show a tendency to get darker in contrast to normal panel. We’ve tried to minimize color shift through use of LUT (Look Up Table) for linear arithmetic processing of input data, data bit expansion to 12-bit for minimizing arithmetic tolerance and brightness weight of white sub-pixel on each R, G, B pixel. The objective of this study is to minimize and keep Δuv value (we commonly use to represent a color difference), quantitative basis of color difference between RGB stripe structure and RGBW quad structure, below 0.01 level (existing 0.02 or higher) using Macbeth colorchecker that is general reference of color characteristics.