Browsing by Author "Kuo, Chia-Wei"

Now showing 1 - 3 of 3

Flexible Homeotropic Liquid Crystal Displays Using Low-Glass-Transition-Temperature Poly(ethylene terephthalate) Substrates
(2010)
Teng, Wen-Yu
;
Jeng, Shie-Chang
;
Ding, Jau-Min
;
Kuo, Chia-Wei
;
Chin, Wei-Kuo
This research is aimed at fabricating flexible homeotropic liquid crystal displays (LCDs) using low-glass-transition-temperature poly(ethylene terephthalate) (PET) substrates. The low-temperature technique of nanoparticle-induced vertical alignment (NIVA) was successfully applied to the flexible homeotropic PET-LCD. The PET film generally exhibits birefringence, which greatly interferes with the phase retardation of light propagation in the LCD. This problem can be alleviated by adjusting the optical axis with respect to the axis of the polarizer. The resulting flexible PET-LCD exhibited a low threshold voltage of 2.1 V and a transmittance of 53% at 3.2 V in the flat state. (C) 2010 The Japan Society of Applied Physics
Image content adaptive color breakup index for field sequential color displays using a dominant visual saliency method
(2018-02-01)
Qin, Zong
;
Lin, Ying-Ju
;
Lin, Fang-Cheng
;
Kuo, Chia-Wei
;
Lin, Ching-Huan
An index that can predict the perceptual visibility of color breakup for varying image content is valuable in field sequential color displays, whereas the current indices are usually for fixed patterns. To solve this problem, an image database containing 25 diverse reference images and 125 test cases with various color breakup visibility was first established. Next, visual experiments using a 240-Hz liquid crystal display were performed to acquire the subjective color breakup scores of the test cases. A theorem based on visual saliency theory was proposed that the color breakup perception is mainly determined by the image regions with visual saliency values higher than a certain threshold, called the dominant visual saliency regions. A computational model based on this theorem was developed to obtain objective color breakup scores of the test cases from retinal images with and without color breakup. An analysis of the objective and subjective results revealed a Pearson linear correlation coefficient as high as 0.82, which matches the top-level image quality assessment algorithms. Finally, the proposed color breakup index was used to benchmark against several mainstream field sequential color algorithms to determine their performances in color breakup suppression.
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.