Browsing by Author "Wu, Chih-Nan"

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An EOG-assisted Contingent Display for Suppressing Saccadic Color Breakup
(2009)
Cheng, Wei-Chung
;
Wu, Chih-Nan
;
光電工程學系
;
Department of Photonics
A contingent field sequential display reduces chroma to inhibit saccadic color breakup on-the-fly when saccadic eye movement is detected by an electro-oculogram (EOG) sensing circuit.
An experimental platform for evaluating color breakup phenomenon
(2007)
Hsu, Chih-Fu
;
Wu, Chih-Nan
;
Cheng, Wei-Chung
;
光電工程學系
;
Department of Photonics
An RGB-LED-backlit LCD was implemented for psychophysical study of color breakup phenomenon. The backlight module can generate colors either sequentially or simultaneously to assess human subject's detectability of color breakup phenomenon.
An experimental platform for evaluating color breakup phenomenon
(2007)
Hsu, Chih-Fu
;
Wu, Chih-Nan
;
Cheng, Wei-Chung
;
光電工程學系
;
Department of Photonics
An RGB-LED-backlit LCD was implemented for psychophysical study of color breakup phenomenon. The backlight module can generate colors either sequentially or simultaneously to assess human subject's detectability of color breakup phenomenon.
An experimental platform for evaluating color breakup phenomenon
(2007-01-01)
Hsu, Chih-Fu
;
Wu, Chih-Nan
;
Cheng, Wei-Chung
;
光電工程學系
;
顯示科技研究所
An RGB-LED-backlit LCD was implemented for psychophysical study of color breakup phenomenon. The backlight module can generate colors either sequentially or simultaneously to assess human subject's detectability of color breakup phenomenon.
Viewing angle-aware color correction for LCDs
(2007)
Wu, Chih-Nan
;
Cheng, Wei-Chung
;
光電工程學系
;
Department of Photonics
Viewing angle-dependent color shift is one of the major drawbacks of liquid crystal displays (LCD). As the viewing angle increases, not only the luminance but also the color saturation reduces and compromises the image quality. In this paper, we characterize the viewing angle-dependent color shift of an LCD and propose a compensation method of adjusting the backlights and panel transmittance simultaneously. By increasing the panel transmittance, the color shift and luminance attenuation can be minimized. By increasing or decreasing the backlight intensity, the original luminance can be preserved or the power consumption can be reduced. Similar to previous approaches, the proposed method requires a video camera to capture the user's location for calculating the viewing angle. We have also implemented an emulator for reproducing the viewing angle-dependent visual effects.
Viewing Direction-Aware Backlight Scaling
(2007)
Wu, Chih-Nan
;
Cheng, Wei-Chung
;
光電工程學系
;
Department of Photonics
High power consumption and limited viewing angles are the two major drawbacks of liquid crystal displays (LCDs). This paper models the angular-dependent luminance attenuation of a twisted nematic LCD and incorporates user's viewing direction into a backlight scaling framework such that the power consumption can be minimized while preserving the optimal image quality. We also studied the human factors of viewing direction variation, and developed an emulator for visualizing luminance attenuation and color shift in different viewing directions.