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21.
Abstract— The dynamic response of the chiral-homeotropic liquid-crystal cell has been investigated. The well-known optical bounce which was originally found in TN cells also appears in chiral-homeotropic cells. We have examined this bounce phenomenon by both experiments and computer simulations. 相似文献
22.
Y. Toko T. Takahashi K. Miyamoto S. Yokoyama S. Takigawa S. Nishino N. Toshima S. Kobayashi 《Journal of the Society for Information Display》2008,16(9):957-960
Abstract— STN‐LCDs embedded with special metal nanoparticles of Ag/Pd are shown to be useful for a direct‐multiplexed dot‐matrix STN‐LCD with 320 × 240 pixels and show a fast response time by 3–5 times compared to those without nanoparticles. This phenomenon is shown to be attributed to the reduction of rotational viscosity by 70% at room temperature and by 30% at a low temperature (?20°C). The alteration of elastic constants by doping nanoparticles could be also essential. 相似文献
23.
Hyunwoo Park Sungha Kim Soohwan Kim Youngkwon Jo Suki Kim Richard I. McCartney 《Journal of the Society for Information Display》2008,16(3):509-515
Abstract— As thin‐film‐transistor liquid‐crystal‐display (TFT‐LCD) panels become larger and provide higher resolution, the propagation delay of the row and column lines, the voltage modulation of Vcom, and the response time of the liquid crystal affect the display images now more than in the past. It is more important to understand the electrical characteristics of TFT‐LCD panels these days. There are several commercial products that simulate the electrical and optical performance of TFT‐LCDs. Most of the simulators are made for panel designers. However, this research is for circuit, system, and panel designers. It is made in a SPICE and Cadence environment as a commercial circuit‐design tool. For circuit and system designers, it will help to design the circuit around a new driving method. Also, it can be easily modified for every situation. It also gives panel designers design concepts. This paper describes the electrical model of a 15‐in. XGA (1024 × 768) TFT‐LCD panel. The parasitic resistance and capacitance of the panel are obtained by 3‐D simulation of a subpixel. The accuracy of these data is verified by the measured values of an actual panel. The developed panel simulation platform, the equivalent circuit of a 1 5‐in. XGA panel, is simulated by HSPICE. The results of simulation are compared with those of experiment, according to changing the width of the OE signal. The proposed simulation platform for modeling TFT‐LCD panels can be especially applied to large‐sized LCD TVs. It can help panel and circuit designers to verify their ideas without making actual panels and circuits. 相似文献
24.
Akira Kawaguchi Michio Tsujio Tetsuo Hamada Masayoshi Funato Yuji Yoda Koichi Oka 《Journal of the Society for Information Display》2001,9(4):301-306
A new photometry to perform the viewing‐angle characterization for reflective‐type LCDs has been developed. The optics consists of a rotating ellipsoidal mirror and a 2‐D CCD camera. The information obtained by this photometry includes the viewing‐angle characteristics of reflectance, contrast ratio, and chromaticity coordinates, which are comparable to gonioscopic photometry in terms of accuracy. Both the illuminating polar angle and azimuth angle can be scanned. The measurement time for this method is as short as that for conoscopic photometry when using a 2‐D CCD camera. An instrument equipped with light‐polarizing devices is already available. If analytic software was available, viewing‐angle characterization could be determined by a polarization analysis. 相似文献
25.
Norio Koma Tetsuya Miyashita Tatsuo Uchida 《Journal of the Society for Information Display》2001,9(4):331-336
We report a new technique for the design of field‐sequential‐color liquid‐crystal displays (FS‐LCDs), which maximizes the liquid‐crystal response,tLC, by dividing the display area into as few sub‐areas,N, as possible. We obtained the following results: (1) tLC increased as N increased, although saturation tended to occur. Increasing N from 1 to 2 gave the largest increase in tLC. (2) tLC was maximized by dividing the display area unequally. 相似文献
26.
Masumi Kubo Takashi Ochi Yozo Narutaki Tokihiko Shinomiya Yutaka Ishii 《Journal of the Society for Information Display》2000,8(4):299-304
A new LCD referred to as an “Advanced TFT‐LCD” has been developed. It consists of both transmissive and reflective electrodes in every pixel. Its subjective legibility and characteristics, such as contrast ratio, color gamut, and luminance, have been investigated at several ambient illumination intensities. As a result, it was confirmed that Advanced TFT‐LCDs offer better legibility than transmissive LCDs under any ambient illumination intensity. 相似文献
27.
A silicon‐chip‐based light valve with reflective twisted‐nematic mode for high‐definition projectors
Shoichi Hirota Makoto Tsumura Hideki Nakagawa Katsuhiko Shibata Iwao Takemoto 《Journal of the Society for Information Display》2000,8(4):305-311
Crystalline‐silicon‐chip‐based reflective light valves are suitable for realizing high definition and bright liquid‐crystal projectors. We have developed an XGA (1025 × 769 pixels) silicon‐chip‐based light valve with a diagonal display area of 2.54 cm (1 in.). The reflective twisted‐nematic mode was examined by using the Jones matrix method as a display mode, and the normally white reflective twisted‐nematic mode was selected. This mode is suitable for a narrow cell gap, and a fast response time can be expected. In addition, the driving voltage of this mode is low and has good chromaticity with small retardation. The cell gap of the light valve is 2 μm. The cell gap support is made using spacer posts formed on the silicon chip with a photodefinable resin. The response time is 12 msec, including both rise and fall times. The contrast ratio is more than 1000 at 5 Vrms. 相似文献
28.
S. Komura K. Kuwabara O. Itou M. Abe K. Funahata K. Kondo N. Hoshino Y. Iwakabe 《Journal of the Society for Information Display》2000,8(4):269-276
In reflective color STN‐LCDs, it is necessary to achieve achromatic representation in single‐polarizer STN‐LCD modes. We propose an optimization method for the optical components of single‐polarizer STN‐LCD modes in order to achieve achromatic representation. By applying this method, it is shown that a contrast ratio of more than 20 can be achieved in the normally black (NB) mode. Furthermore, we prove that the normally white (NW) mode can be realized as well as an NB mode which is usually used in current reflective color STN‐LCDs. Comparing the viewing‐angle characteristics of the NW and NB modes, it was found that those of the NW mode are better than those of the NB mode. Particularly, high reflectance can be realized even at larger viewing angles in the NW mode. 相似文献
29.
Yinji Piao JongHyon Park JeaHyoung Park HyunWook Park 《Journal of the Society for Information Display》2010,18(5):386-390
Abstract— An overdrive technology was developed and is widely used to diminish motion blur in LCDs. To store a previous frame in the overdrive operation in a limited‐sized memory, simple image‐compression techniques are required. By considering the strong correlation of nearby pixels in natural images, a new 6:1 color‐image‐compression method based on directional prediction is proposed. Different from the directional prediction of intra‐coding in H.264/AVC, the predictable direction is determined beforehand to minimize the computation complexity. A simple content‐adaptive quantization and bit‐streaming method, which preserves image details and is free from blocking artifacts, is also proposed. The experimental results show that our proposed method outperforms the vector quantization block truncation coding method with an average 3‐dB peak signal‐to‐noise ratio (PSNR) as well as the subjective quality in terms of blocking artifacts. 相似文献
30.
Manabu Kodate Eisuke Kanzaki Kai Schleupen 《Journal of the Society for Information Display》2003,11(1):115-119
Abstract— We propose a novel data‐line multiplexing technique for low‐cost/high‐resolution active‐matrix liquid‐crystal displays (AMLCDs). This scheme reduces the number of data lines and driver chips required by one‐half without enormous multiplexing circuits. Another advantage of applying this technique is the reduction in power consumption. We demonstrated the technical feasibility of this method with application prototypes up to 15‐in. SXGA+ (1400 × 1050 pixels) AMLCDs with amorphous‐silicon (a‐Si) thin‐film‐transistor (TFT) technology. In this paper, we provide an explanation of the addressing mechanism in detail and clarify the feasibility with further technical discussion. 相似文献