Browsing by Author "Tsou, Chien-Lung"

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Enhanced power efficiency of single-layer white triplet polymer light-emitting diodes by blending with polymer oxides
(2008)
Chen, Yung-Shiuan
;
Chien, Shang-Chieh
;
Chen, Fang-Chung
;
Lian, Jan-Tian
;
Tsou, Chien-Lung
In this study, we have demonstrated enhanced performance of blue, red and white phosphorescent polymer light-emitting diodes (PLEDs) by blending poly(ethylene glycol) (PEG) into the active layer of the devices. By introducing PEG into the PLEDs, the turn-on voltages of these devices became lower than those of the conventional devices. In addition, the luminance efficiency and the external quantum efficiency of the blue and while phosphorescent PLEDs were both improved. Most important of all, because of the lower operating voltage, the higher power efficiency (7.3 lm/W, 1.5 lm/W, 4.61m1W) of the blue, red and white phosphorescent PLEDs than those of the control devices (2.9 lm/W, 1. 1 lm/W, 1. 9 lM/W) have been achieved, respectively. Finally, the improvement mechanism will be discussed.
Novel surface treatment film of polarizer to improve optical properties of 32 inch OCB mode LCD TV
(2007-01-01)
Lien, Jan-Tien
;
Chen, Sze-Fen F.
;
Pan, Chien-Lin
;
Chang, Chih-Chun
;
Lin, Tai-Yuan
We have developed OCB mode LCD panel possess fast response time (Gray to Gray Level) about 0.98 ms and low color washout Gamma Distortion Index (D value) is 0.06, and it's smaller than VA mode LCD. To use novel surface-treatment film of polarizers is useful to reduce Chroma difference (Delta Cu'v') of horizontal viewing direction and increase viewing angles of 32 inch OCB panel. The value of Delta Cu'v' is lower than 0.02.