Browsing by Author "CHEN, HK"

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AMBIPOLAR PERFORMANCES OF NOVEL AMORPHOUS SILICON-GERMANIUM ALLOY THIN-FILM TRANSISTORS
(1993-08-01)
HSIEH, SW
;
CHANG, CY
;
LEE, YS
;
LIN, CW
;
WU, BS
The limitation of low hole mobility in hydrogenated amorphous silicon thin-film transistors (a-Si:H TFTs) was overcome in this present work by utilizing hydrogenated amorphous silicon-germanium (a-Si1-xGex:H) alloys as the active channel of TFTs. The performance of hydrogenated amorphous silicon-germanium thin film transistors (a-SiGe:H TFTs) was optimized by switching the germane-to-silane flow ratio. The fabricated a-SiGe:H TFT with 12 at% germanium content was measured as possessing an electron mobility of 0.71 cm2/V.s and a hole mobility of 0.54 cm2/V.s. The on/off current ratio ranging over almost six orders of magnitude in both conduction modes was obtained. Thus a-SiGe:H TFT has offered the opportunity for upgrading of a-Si:H TFTs and would be feasible for application in [CMOS] circuits.
OPTIMUM DESIGN OF LIQUID-CRYSTAL DISPLAY PARAMETERS IN PROJECTION AND DIRECT VIEW APPLICATIONS
(1993-08-01)
CHENG, JS
;
WU, TK
;
HAO, CW
;
HSIEH, TC
;
GONG, YG
Two kinds of liquid crystals are selected with the aid of computer simulation for the fabrication of high-contrast liquid crystal displays (LCDs). One is suitable for the first minimum operation of a twisted nematic LCD and the other is suitable for the second minimum operation. The contrast ratios in the normally white mode of the first minimum operation and the contrast ratio in the normally black mode of the second minimum operation are both higher than 100:1. These LCDs can be used in direct view and projection applications.
THE LIPAUNOV STABILITY OF THE ROTATION OF A GYROSTAT
(1994)
GE, ZM
;
CHEN, HK
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
First sufficient conditions (including equalities) of the stability and the instability of the rotation of a gyrostat in a uniform field are obtained by the Liapunov direct method. Next sufficient conditions (including equalities) of the stability and the instability of the rotation of a gyrostat in a Newtonian central force field are studied by the Liapunov direct method. In the third part, the instability of the rotation of a gyrostat both in a uniform field and in a central force field is studied by the first approximation theorem and the results are compared with those obtained from the Liapunov. direct method.