Evaluation of motion performance on scanning-backlight LCDs

The scanning-backlight technique to improve the motion performance of LCDs is introduced. This technique, however, has some drawbacks such as double edges and color aberration, which may become visible in moving patterns. A method combining accurate measurements of temporal luminance transitions with the simulation of human-eye tracking and spatiotemporal integration is used to model the motion-induced profile of an edge moving on a scanning-backlight LCD-TV panel that exhibits the two drawbacks mentioned above. The model results are val idated with a perception experiment including different refresh rates, and a high correspondence is found between the simulated apparent edge and the one that is perceived during actual motion. Apart from the motion-induced edge blur, the perception of a moving line or square-wave grating can also be predicted by the same method starting from the temporal impulse and frame-sequential response curves, respectively. Motion-induced image degradation is evaluated for both a scanning- and continuous-backlight mode based on three different characteristics: edge blur, line spreading, and modulation depth of square-wave grating. The results indicate that the scanning-backlight mode results in better motion performance. © Copyright 2009 Society for Information Display.

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