共查询到20条相似文献,搜索用时 0 毫秒
1.
Akira Masutani Tony Roberts Bettina Schüller Nadine Hollfelder Pinar Kilickiran Akira Sakaigawa Gabriele Nelles Akio Yasuda 《Journal of the Society for Information Display》2008,16(1):137-141
Abstract— A polymer‐dispersed liquid‐crystal (PDLC) matrix template embedded with nano/microparticles can be backfilled/infiltrated with a dye‐doped liquid crystal for a paper‐like reflective display. In this way, a desirable degree of diffusion can be realized to reduce the viewing‐angle dependency of a gain reflector and metallic glare without changing other electro‐optical properties. 相似文献
2.
Jun Qian Feng Gao Hui‐Hui Liu Chao‐Qun Tang Feng Liu 《Journal of the Society for Information Display》2013,21(12):511-516
A reflective CMYK (cyan, magenta, yellow, and black) module using polymer‐dispersed liquid crystal (PDLC) is investigated for multi‐color reflective display. Combined with the electro‐optical properties and visible spectral reflectivity of PDLC films, the color properties of the reflective CMYK module were evaluated in terms of the Uniform Color Space‐CIE 1976 L*a*b*. It is found that the blue light reflectivity of the PDLC films is lower than green light and red light reflectivity. With the increase of the voltage applied on PDLC, the color lightness of the CMYK module generally decreases, while the color saturation increases. When the voltage changed from 0 to 70 V with a 5‐V change amplitude, modules C, M, Y, and K severally exhibit at least five, six, three, and seven colors. 相似文献
3.
Akira Masutani Tony Roberts Bettina Schüller Akio Yasuda Akira Sakaigawa Graham Cross David Bloor 《Journal of the Society for Information Display》2004,12(3):301-307
Abstract— A novel preparation method for dichroic dye‐doped polymer‐dispersed liquid crystals has been developed. This was achieved by creating a porous polymer matrix first by washing out the liquid crystal from a polymer‐dispersed liquid crystal (PDLC), which is then refilled with dye‐doped liquid crystal. Optimizing the liquid crystal used in the refilling results in decreased turn‐on voltage and faster response time. Poster‐standard reflectivity and newspaper‐standard contrast was demonstrated with a 3.8‐in. QVGA reflective TFT display with a drive voltage of 10 V. 相似文献
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5.
Scott J. Woltman Gregory P. Crawford 《Journal of the Society for Information Display》2007,15(8):559-564
Abstract— A two‐dimensional array consisting of dye‐doped reflection‐mode holographic‐polymer‐dispersed liquid crystal (H‐PDLC) lasers with alternating pitch lengths is presented. These post structures each reflect at a narrow bandwidth of light. The addition of laser dye to the H‐PDLC system allows for the generation of laser emission at the edge of the reflection band, or photonic band gap. In patterning these H‐PDLC post structures, a narrow‐linewidth patterned emissive color film is realized. The potential of such films and their implication in the display industry is discussed. In creating a three‐color array, an active emissive color film could replace the backlight and color filter components within the display. Such a patterned system would possess a wide color gamut, through spatial color synthesis, formed by narrow‐linewidth lasing structures with well‐defined wavelengths of emission. 相似文献
6.
Hongming Zhan Zheng Xu Chao Tian Yupeng Wang Ming Chen Woong Kim Zhanchang Bu Xibin Shao Seongkyu Lee 《Journal of the Society for Information Display》2014,22(11):545-551
In order to achieve the standard red, green, and blue (sRGB) standard color gamut in color liquid crystal display and improve the image quality, the impact of the backlight and color filter spectrum on module's chroma was simulated and analyzed. The color gamut was enhanced by adjusting and optimizing the two parts of spectrums of LED backlight and color filter and by using red and green phosphor LED backlight to match the new color filter with an appropriate thickness. Experimental results show that: When the thickness of color filter is 2.2 µm, National Television System Committee color gamut increases from 65.3% to 74.9%, and sRGB matching rate enhances from 83.2% to 100%, achieving a full coverage of the sRGB standard color gamut, the transmittance of white light reaches 28.1%. Also, it is verified that shifting the peak position of the backlight and color filter spectrum to purification direction, as well as narrowing its half‐width can upgrade the color gamut. Meanwhile, the thicker the thickness of color filter is, the wider color gamut it has, based on the same pigment material. 相似文献
7.
Shao‐Chang Huang Chun‐Li Chu Ta‐Liang Chiu Ke‐Horng Chen 《Journal of the Society for Information Display》2011,19(2):170-177
Abstract— The proposed liquid‐crystal and backlight (LC/BL) algorithm presents the dynamic field‐sequential‐color (D‐FSC) algorithm to reduce the color‐breakup (CBU) effect without greatly increasing the subframe rate. The D‐FSC algorithm can intelligently select one adequate color sequence from multiple color sequences according to the image data. In other words, the scope of CBU suppression of the proposed LC/BL algorithm is more extensive than other conventional FSCs. Simulation results show that the CBU suppression can be improved substantially by the proposed evaluation equation. 相似文献
8.
Yi‐Pai Huang Xinyu Zhu Hongwen Ren Qi Hong Thomas X. Wu Shin‐Tson Wu Mu‐Zen Su Meng‐Xi Chan She‐Hong Lin Han‐Ping D. Shieh 《Journal of the Society for Information Display》2004,12(4):417-422
Abstract— A full‐color bistable transflective cholesteric liquid‐crystal display (Ch‐LCD) was demonstrated by using an imbedded image‐enhanced reflector (IER) on top of each transmissive subpixel. The RGB colors were achieved by patterning conventional color filters on a black‐and‐white Ch‐LCD. In addition, the IER on top of each transmissive subpixel provides similar paths for the transmissive backlight and the reflected ambient light. A simple transflective Ch‐LCD was demonstrated. 相似文献
9.
Y. Ukai T. Ohyama L. Fennell Y. Kato M. Paukshto P. Smith O. Yamashita S. Nakanishi 《Journal of the Society for Information Display》2005,13(1):17-24
Abstract— A thin‐crystalline‐film (TCF) polarizer has been developed which can be used internally in liquid‐crystal‐display cells. Based on this material, a manufacturing process has been developed for the fabrication of monochrome LCDs with internal polarizers. A new TCF polarizer material and coating equipment, developed to realize a high‐performance color TFT‐LCD, are discussed. 相似文献
10.
Michael L. Ermold Adam K. Fontecchio 《Journal of the Society for Information Display》2005,13(9):787-792
Abstract— This work presents a method to increase the viewing angle of holographic polymer‐dispersed liquid‐crystal (H‐PDLC) reflective displays. One of the drawbacks to H‐PDLC technology is the existence of a narrow viewing angle. We present a way to alleviate this problem by structuring the phase front of the recording beams to increase the viewing cone of the display. Analysis of the diffractive properties of these holograms shows that the macroscopic and the nanoscale morphologies both play a role in the optical properties of the films. 相似文献
11.
Klil Klntr Tadashi Kishimoto Kazuo Sekiya Tetsuya Miyashita Tatsuo Uchida 《Journal of the Society for Information Display》2006,14(2):151-159
Abstract— A spatially and temporally scanning backlight consisting of ten isolated micro‐structured light guides has been developed to be combined with a fast‐response optically‐compensated‐bend‐mode field‐sequential‐color LCD in which the liquid‐crystal cell does not contain color filters. The sequential fields of three primary colors are generated by illumination of the red‐, green‐, and blue‐light‐emitting diodes, each illuminating for one‐half of the field, resulting in a luminance of 200 cd/m2 for the LCD. The effect of light leakage between the blocks in the scanning backlight in field‐sequential‐color applications was measured and will be described. 相似文献
12.
Yuichi Momoi Musun Kwak Donsik Choi Youngseok Choi Kyongdeuk Jeong Tomonori Koda Osamu Haba Koichiro Yonetake 《Journal of the Society for Information Display》2012,20(9):486-492
Vertical alignment (VA) and in‐plane switching modes have been widely used for liquid crystal displays (LCDs). They require a polyimide (PI) alignment layer in the pixel structure. PI‐free LCDs have been proposed to exploit the VA of liquid crystals (LCs) obtained by dissolving dendrimers without PI. In this paper, we report a new PI‐free VA mode with a pixel structure that has in‐plane electrodes. The PI‐free VA is achieved by dissolving an LC dendrimer in a positive LC mixture. We measured the test cell properties and obtained a lower voltage and a higher brightness in the voltage–brightness curve. In addition, we analyzed the alignment surface of LC dendrimer by time‐of‐flight secondary ion mass spectrometry and scanning electron microscopy observations. We found that dendrimer molecules are uniformly adsorbed on the glass surface and that the layer was generally one molecule thick. These properties are responsible for the lower voltage and higher brightness of the PI‐free VA mode. The use of dendrimers allows the PI process to be omitted and reduces the power consumption of the VA mode. It is thus possible to reduce the high manufacturing costs and improve the performance of the VA mode. 相似文献
13.
Suraj P. Gorkhali Gregory P. Crawford Maryna Yemtsova Theo Rasing 《Journal of the Society for Information Display》2007,15(8):553-558
Abstract— A 3‐D array of helical structures fabricated using holographic polymer‐dispersed liquid crystals (H‐PDLC) is presented. Multiple coherent beams are interfered to create a constructive helical pattern which is permanently captured using the standard H‐PDLC method. Films with such array of helical structures have both diffractive and circular polarization sensitive reflective properties. Iso‐intensity patterns, design parameters, fabrication process, optical/electro‐optical performance of these periodic helical structures are discussed along with their potential application for advanced electro‐optical devices. 相似文献
14.
S. Fujita H. Yamaguchi H. Mizuno T. Ohtani T. Sekime T. Hatanaka T. Ogawa 《Journal of the Society for Information Display》1999,7(2):135-140
Abstract— A reflective color STN-LCD with a single polarizer and double retardation films has been investigated. The double retardation films arranged in front of the LC layer enabled the LCD to contain reflective electrodes inside the panel. This configuration achieves a bright image with no parallax. A new construction of a reflective STN-LCD with a single polarizer has been developed by means of our own method in which the color difference ΔE* as the optimizing parameter has been used. Further, RGB color filters have been newly designed for our reflective LCD, and an aluminum (Al) layer has been introduced as a reflective electrode. As a result, we have realized a 7.8-in.-diagonal reflective color STN-LCD (640 × 480) which has 15% reflectance, 14:1 contrast ratio, 4096-color capability, and sufficient color gamut. It has been confirmed that the single-polarizer reflective color STN-LCD has sufficient performance for mobile business tools. We believe that it will be a key device for this application. 相似文献
15.
W. Lewis Collier Robert A. Powell Kenneth A. Pietrzak Matthew H. Smith 《Journal of the Society for Information Display》2006,14(1):107-112
Abstract— Test equipment for reflective LCD devices must use a calibration target to mimic a known state of the intended display devices under test (DUTs). This target must also mimic the polarization effects of the DUTs. Traditionally, a mirror and quarter‐wave plate (MQWP) assembly is used for this function. By accounting for the reflectivity of the mirror and the transmission of the QWP, a reference target can be generated. The effects of the use of a QWP in this role will be examined and additional effects for which compensation must be performed in order to achieve accurate test results will be discussed. 相似文献
16.
Reflective full‐color LCD using low‐temperature polysilicon TFTs in low‐frequency driving: Analysis of image persistence and flicker with scientific CMOS camera 下载免费PDF全文
Hajime Yamaguchi Yasushi Kawata Yuki Matsuura Muneharu Akiyoshi Kisako Takebayashi Takumi Sano Akio Murayama Yoko Fukunaga Masaya Tamaki Masashi Mitsui Naoyuki Takasaki Takashi Nakamura Yoshiro Aoki Hirotaka Hayashi 《Journal of the Society for Information Display》2016,24(7):439-448
Image persistence and flicker are major issues for low‐frequency driving of LCDs. Detailed investigation of the mechanisms that produce these phenomena, using image analysis with a scientific CMOS camera, enabled us to reduce it to acceptable levels. We successfully developed a 7.0‐in. WUXGA (1200 × RGBW × 1920) reflective color LCD driven by low‐temperature polysilicon TFTs at 1 Hz. 相似文献
17.
Zhiguo Meng Cathy Li Hoi S. Kwok Man Wong 《Journal of the Society for Information Display》2001,9(4):319-323
Single‐polarizer reflective twisted‐nematic (RTN) liquid‐crystal modes offer larger viewing angles, higher contrast ratios and lower power dissipation compared to regular double‐polarizer transmissive‐ reflective liquid‐crystal implementations. The application of re‐crystallized metal‐induced unilaterally crystallized polycrystalline‐silicon thin‐film‐transistor (TFT) technology to realize active matrices and peripheral circuit components for hand‐held direct‐view RTN‐mode video displays is reported. 相似文献
18.
Seung Hee Lee Hyang Yul Kim Seung Min Lee Seung Ho Hong Jin Mahn Kim Jai Wan Koh Jung Yeal Lee Hae Sung Park 《Journal of the Society for Information Display》2002,10(2):117-122
Fringe‐field‐switching (FFS) devices using liquid‐crystal (LC) with a negative dielectric anisotropy exhibit high transmittance and wide viewing angle simultaneously. Recently, we have developed an “Ultra‐FFS” thin‐film‐transistor (TFT) LCD using LC with a positive dielectric anisotropy that exhibits high transmittance, is color‐shift free, has a high‐contrast ratio in a wide range, experiences no crosstalk and has a fast response time of 25 msec. In this paper, the device concept is discussed, and, in addition, the pressure‐resistant characteristics of the devices compared with that of the twisted‐nematic (TN) LCD is discussed. 相似文献
19.
Seong‐Young Ryu Dong‐Hoon Baek Hyun‐Wook Lim Sang‐Kyo Han Kyung‐Ho Ryu Kwang‐Hyun Park Jin‐Yong Park Jung‐Min Lee Tae‐Jin Kim Jae‐Youl Lee Gyeong‐Nam Kim 《Journal of the Society for Information Display》2016,24(5):277-285
A universal column driver is implemented in a 0.13‐µm high‐voltage CMOS process for not only TFT‐LCD but also OLED applications. The proposed column driver employs 13‐bit linear DAC to cover all gamma curves of display applications and address‐based configuration for intra‐ panel interface protocol to support both TV and IT applications. Measured results demonstrate the average voltage of output channels (AVO) is under 1mv, which satisfies 1‐LSB resolution at 18.5V of AVDD. 相似文献
20.
HyungKi Hong KyongHo Lim JaeHong Kim SunHee Park HongSeop Shin DonGyou Lee Hyunho Shin 《Journal of the Society for Information Display》2011,19(3):303-310
Abstract— 3‐D cross‐talk typically represents the ratio of image overlap between the left and right views. For stereoscopic LCDs using shutter‐glasses technology, 3‐D cross‐talk for stereoscopic LCD TV with a diagonal size of 46 in. and vertical alignment (VA) mode was measured to change from 1% to 10% when the stereoscopic display is rotated around the vertical axis. Input signals consist of the left and right images that include patterns of different amounts of binocular disparity and various gray levels. Ghost‐like artifacts are observed. Furthermore, intensities of these artifacts are observed to change as the stereoscopic display is rotated about the vertical axis. The temporal luminance of the LCD used in stereoscopic TV was found to be dependent on the viewing direction and can be considered as one cause of the phenomenon of angular dependence of performance for stereoscopic displays. 相似文献