Browsing by Author "Ho, Cheng-Ta"

Now showing 1 - 2 of 2

Innovative plasma alignment method in flexible liquid crystal display films
(2007)
Liu, Kang-Hung
;
Lee, Chin-Yang
;
Ho, Cheng-Ta
;
Cheng, Horng-Long
;
Lin, Shih-Ting
Liquid crystals (LCs) in flexible cell were aligned on polyimide (PI) surface treated by a paperlike plasma beam. The beam had energy of 450 eV and incident angle of 70 with respect to normal flexible indium-zinc oxide-coated substrate. The pretilt angle and anchoring energy of LCs on plasma-aligned PI surface were almost identical to the angle and energy of the rubbing PI. However, optical performance of the plasma-aligned cell was superior to the rubbing cell under various bending conditions. Furthermore, such noncontact alignment technology is suitable for large area and roll-to-roll fabrication of flexible LC films. (c) 2007 The Electrochemical Society.
Microcell liquid crystal film for high-contrast flexible display applications
(2006-10-01)
Liu, Kang-Hung
;
Chou, Wei-Yang
;
Liao, Chi-Chang
;
Ho, Cheng-Ta
;
Shieh, Han-Ping D.
We have successfully fabricated high-contrast microcell liquid crystal displays (LCDs) using microstructure replication technology in thin plastic film substrates. These novel flexible LCDs comprise microcell replication, alignment treatments, and cell assembly. The cell gap of such flexible LCDs was maintained well by cross-type spacers formed by photolithography, despite bending: moreover, the deviation in cell gap under various bending states was less than 0.1 mu m. The structure, fabrication technique, and basic display characteristics of the flexible LCD are also described. Finally, this device shows high mechanical stability against external bending, a high contrast ratio of 500 : 1, and an acceptable response time. Compared with photopolymerisation-induced phase separation, the micro-cell LCD has a higher contrast ratio, a more reliable fabrication process, and a strong potential as a high-performance flexible LCD.