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 共查询到20条相似文献,搜索用时 109 毫秒
1.
才勇  郭建新 《液晶与显示》1997,12(2):107-111
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   

2.
聚甲基丙烯酸肉桂酰氧基乙酯的光控取向研究   总被引:3,自引:3,他引:0  
研究了向列相液晶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(CEMC)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   

3.
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   

4.
为了改善常规的ECB LCD的显示品质,采用不摩擦技术制备了无序的平行ECB液晶盒,并研究了盒中液晶的微观织构,分析了它的电光特性和视角特性。无序的平行ECB液晶盒是多畴的且具有不能被人的肉眼所识别的微观向错的结构,并具有分色性好、视角在整个平面内方位对称等特性。为了克服实际驱动时产生的宏观向错,制备了聚合物稳定的无序的平行ECB器件,其聚合物形成的网络限定了向错的界限,有效地防止了宏观向错的形成。  相似文献   

5.
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   

6.
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   

7.
梁兆颜  闫石 《液晶与显示》1997,12(4):237-243
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   

8.
液晶盒外加一定的电压,会改变液晶分子的取向排列,这样液晶层的有效介电常数也会随之发生改变。如果把液晶盒看作一个电容器,其电容也会有所改变。本论文理论研究强锚泊混合排列向列相液晶盒的电容特性,基于液晶弹性理论和变分原理,理论推导液晶盒系统的平衡态方程及电容的解析表达式,通过Matlab软件数值模拟了此液晶盒的电容-电压曲线和指向矢分布曲线,并对其电容特性进行了分析。  相似文献   

9.
研究了强锚定边界条件下光学补偿弯曲排列(OCB)液晶的动态驱动特性。理论模拟计算了OCB液晶盒内液晶分子指向矢在给定电压情况下的分布规律,得到光线垂直入射时液晶盒相对透过率随交流电压有效值的变化曲线。实验测试液晶盒的电光特性,并给出测试液晶盒动态驱动条件下的响应时间及视角特性。  相似文献   

10.
本文利用酞菁LB膜实现了液晶分子的混合排列,对其取向和电光性质进行了研究,发现混合向列排列(HAN)型液晶盒不存在阀值电压,具有较好的色彩分离,证实酞菁取向膜具有相当好的热稳定性,有一定的实用价值。  相似文献   

11.
一个新奇的机电驱动激励膜显示器(AFD)已开发成功。它的可移动臂能呈现黑色、白色(或彩色)带,可通过加电压脉冲来变色。能用简单阵列驱动,能实现低功耗像纸一样的黑白显示和全色显示。  相似文献   

12.
基于激光显示的颜色系统的建立   总被引:2,自引:5,他引:2  
通过对普通电视NTSC制式色坐标系统建立的研究,将此系统的模型推广至激光为三基色的颜色系统模型的建立,不仅可以使原有电视色域很好地映射到激光色域,而且通过颜色的虚拟扩展,将原有荧光粉无法显示的颜色扩展到激光色域内,使再现颜色更逼真,颜色更饱和。电视RGB制式与激光RGB制式转换关系建立后,用其作为输入信号的标准,则对应输入信号就能够转换为激光制式对应的电信号,为后序的电路处理做好了准备。  相似文献   

13.
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   

14.
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   

15.
有机电致发光显示器件的最新发展   总被引:1,自引:0,他引:1  
有机电致发光器件(OLEDs)具有驱动电压低、亮度大、效率高、能实现大面积平板彩色显示以及柔性显示等优点,在平板显示领域引起广泛的关注,近年来成为国际上的研究热点,前景诱人.简要介绍了有机电致发光器件的结构、发光原理、主要特点及3种主要有机电致发光器件,并讨论了该领域的研究热点问题.  相似文献   

16.
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   

17.
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   

18.
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   

19.
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   

20.
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   

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