Browsing by Author "Hsu, Chih-Fu"

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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.
Temporal vision-guided energy minimization for portable displays
(2006)
Cheng, Wei-Chung
;
Hsu, Chih-Fu
;
Chao, Chain-Fu
;
光電工程學系
;
Department of Photonics
This paper presents a novel backlight driving technique for liquid crystal displays. By scaling the intensity, frequency, and duty cycle of the backlight, this technique not only increases the perceived brightness but also prolongs the service time Of rechargeable batteries. The increased brightness comes from a perceptual effect of temporal vision - a brief flash appears brighter than a steady light of the same intensity, called Brucke brightness enhancement effect. The prolonged service time comes from the relaxation phenomenon - a lithium-ion battery lasts longer by pulsed discharge. Combining these two effects, a great amount of service time can be obtained at the cost of flickering. We performed visual experiments to parameterize the Brucke effect and derived an optimization algorithm accordingly. To demonstrate the potential energy savings of this technique, we profiled the power consumption of an Apple iPod and fabricated an LED driving module. Based on experimental data, 75% of energy consumption can be saved and the service time can be extended to 300%.
Theoretic bounds on panel size of flicker-free field sequential liquid crystal displays
(2007)
Hsu, Chih-Fu
;
Cheng, Wei-Chung
;
光電工程學系
;
Department of Photonics
The Field sequential liquid crystal display (FSLCDs) technology synthesizes color in the temporal domain. However, the temporal property of human visual perception perceives flickering when the refresh rate is not sufficiently high. To estimate the perceivable flickering on FSLCDs, we conducted visual experiments to characterize the critical flicker fusion frequency for different FSLCD panel sizes.