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本文介绍了一种新型的摩擦技术——同心圆摩擦(简称CCR)方法。与普通STN液晶盒相比,CCR液晶盒具有宽而均匀的视角特性、低的阈值特性和快速响应特性。在液晶混合物中加入光聚合物,获得了稳定的CCR液晶盒。 相似文献
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手性垂直排列液晶盒的视角特性 总被引:7,自引:6,他引:1
模拟了手性垂直排列液晶盒的指向矢分布和电光特性,并在大视角内研究了其关态透过率、开态透过率和对比度。研究发现该常黑型显示模式具有很高的对比度、几乎无色散、高亮度、较低工作电压和在水平和垂直方向具有宽视角等特点。文章最后模拟了具有更宽视角的膜补偿手性垂直排列液晶盒。 相似文献
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基板的锚定特性,包括锚定能大小和锚定易取方向,影响液晶指向矢的分布,直接导致液晶盒电容的改变,因此可以通过液晶盒电容的测量确定基板表面的锚定特性。基于液晶弹性理论和变分原理,理论推导弱锚定平行排列向列相和混合排列向列相液晶盒系统的平衡态方程和边界条件,采用差分迭代方法数值模拟得到了液晶盒约化电容随电压、锚定能系数及锚定易取方向变化的曲线。结果表明:液晶盒电容随基板锚定能系数的增加而减小;随预倾角的增加,液晶盒电容随锚定能系数的变化缩小;同一电压和基板锚定能系数下,平行排列向列相液晶盒电容不会大于混合排列向列相液晶的电容。 相似文献
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混合排列向列液晶盒的响应时间常数 总被引:3,自引:2,他引:1
最近的研究表明,混合排列向列(HAN)液晶盒具有较快的响应速度。本文在液晶动力学理论的基础上给出HAN型盒的响应时间常数,并对此进行了讨论。 相似文献
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研究了向列液晶LC-E70分子在肉桂酸酯类材料聚甲基丙烯酸肉桂酰氧基乙酯光控取向层上的排列特性,液晶盒中向错的类型及产生的原因,从理论上计算了这种取向层的方位表面锚定能的数量范围。 相似文献
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《Electron Devices, IEEE Transactions on》1974,21(5):312-313
A liquid-crystal display device is reported combining a polarizer, a deformation of aligned phases (DAP) cell, a twisted nematic (TN) cell, and an analyzer in series arrangement. The color of the transmitted light can be modulated by the application of voltage to the DAP cell. The transmission properties of the device can be switched from the DAP mode for crossed polarizers to that for parallel polarizers by the application of voltage to the TN cell. This improves control of the transmitted color. 相似文献
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A tunable color thin-film electroluminescent (EL) device having a stacked structure of ZnS:Tb, F/ZnS:Mn with red and green colored filters was developed. The obtained red and green emissions have high enough luminance to be considered as a practical tunable color display panel, though the color tone of the green emission approaches yellow-green. It was confirmed that varying the color between red and green can be easily done by changing the filters and applied voltage. This device should be useful for a wide variety of applications in such fields as active information display systems 相似文献
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Shinoda T. Wakitani M. Nanto T. Awaji N. Kanagu S. 《Electron Devices, IEEE Transactions on》2000,47(1):77-81
Plasma display panel (PDP) structure has been investigated to develop a 21-in-diagonal color plasma display with a high-resolution of 0.22-mm subpixel pitch. To realize a high-resolution display, a stripe alignment of three primary color elements such as red, blue, and green, was introduced. Four kinds of panel structures are compared and finally stripe rib and stripe phosphor structures were introduced for the three electrode surface discharge plasma display. The 21-in-plasma display developed with the structure has firstly been put into the market with sufficient performance, such as a wide operating voltage margin, a high luminance, and a wide viewing angle of more than 60 V, 200 cd/m2 , and 160°, respectively 相似文献
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Matsukawa F. Arai H. Ohtani K. Matsushita S. 《Electron Devices, IEEE Transactions on》1990,37(1):116-120
Segment-type, twisted nematic liquid-crystal panels with finely striped, two-color filters within the panel are discussed. The panel has a color filter-on-indium tin oxide structure. Two types of printed filter (an offset-printed (OP) filter and a screen-printed (SP) filter) were subjected to heat treatment and evaluated. It was found that an SP filter of about 0.3 μm has less effect on the operating voltage and availability for multiplexed drive than an OP filter of about 1 μm in thickness with the same color density. The test results for panel reliability for automotive use are given. The panels can digitally display a vehicle's speed, fuel level and engine revolutions in bargraph format with good legibility using three colors 相似文献
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Electrophoretic image display (EPID) panel 总被引:1,自引:0,他引:1
A new reflective-type electrophoretic image display (EPID) panel is described which is based on electrophoresis. In the EPID panel, a suspension is mainly composed of pigment particles and a suspending liquid. A dc voltage applied across a suspension layer changes the reflective color of the suspension as a result of the electrophoretic migration of the particles. The precipitation of the particles in the suspension is prevented by making the densities of the pigment particles and the suspending liquid equal. Color combinations of both the pigment particles and the suspending liquid can be used to achieve a desired color display. A reversal between the colors of the displayed pattern and its background can be obtained by changing the polarities of the applied dc voltage. The EPID panel has a memory function because of the deposition of the pigment particles on the electrode surface. A reflective contrast ratio of 40:1 at 75 V dc is demonstrated with experimental EPID panels. Rise and fall times of the panels are 20 ms and 10 ms, respectively, at 100 V ac. Power dissipation of the panel is about 7.5 mW for displaying a numeral "8" (107 by 59 mm2). 相似文献
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KANG Hao LI Rong-yu YANG Xin 《半导体光子学与技术》2007,13(3):225-229
The increasing use of color terminals for personal computers has raised a demand for video graphic adapter(VGA)-format panel displays. Since only monochrome(ZnS : Mn) electroluminescence(EL) displays of suitable size and speed are available, lack of colors has to be replaced by grayscale in the first place. There are two basic driving methods to achieve grayscale in thin-film EL displays: pulse amplitude modulation(PAM) method and pulse width modulation(PWM) method. But there are serious disadvantages of the two traditional methods. For the former method, the high voltage PAM ICs are too expensive to produce the grayscale EL display in bulks and the driver integrated circuit(IC) is complex. Though the PWM method has good grayscale display quality, the hardware implementation is too complex. A new driving method with which the width and the amplitude of the pulse can be modulated and simultaneously the challenge can be solved efficaciously is presented. 相似文献
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随着液晶显示技术的发展,PPI越来越高,像素尺寸越来越小,穿透率的提升是一重要问题。负性液晶相对正性液晶具有高穿透率,较好的画面画质及较低的颜色偏差等优点,使得主流显示模式IPS、FFS使用负性液晶研究逐渐增多。但由于负性液晶自身特性,其影像残留较正性液晶更为严重,特别是模组粘合附近区域的局部面残。为了改善负性液晶局部影像残留,本文研究了实际样品影像残留严重区域与轻微区域不同测量数据,如温度、共电压(Vcom)等,发现影像残留严重区域与轻微区域的公共电压出现漂移现象,分析了影响残影的因素,并提出改善方案,实测结果证明本文改善局部残影的方法是有效的。 相似文献