公共电极和反射器作互补的单盒式透反射型液晶显示器

给出了一种单盒式透反射型液晶显示器,它采用顶板公共电极和底板的反射器形成互补。这些狭长的公共电极和反射器在透射区域(T区)产生出强劲的纵向电场,而在反射区域(R区)带来微弱的边缘场。无论透射显示模式还是反射显示模式,均给出高的光学效率和良好的匹配灰度。     

一种利用反射电极偏压的半反半透LCD

介绍了一种VA模式反射电极偏压的常黑单盒厚半反半透LCD.在透射区,形成连续且均匀的贯穿液晶层的电场;而在反射区,电场则主要由电极表面形状控制.由此,可使透射区的位相延迟约是反射区的2倍.这样一种半反半透LCD不论透射区还是反射区都有很高的光透过率(＞90%),同时二者灰阶特性重合度也很好.     

一种利用反射电极偏压的半反半透LCD

介绍了一种VA模式反射电极偏压的常黑单盒厚半反半透LCD。在透射区,形成连续且均匀的贯穿液晶层的电场;而在反射区,电场则主要由电极表面形状控制。由此,可使透射区的位相延迟约是反射区的2倍。这样一种半反半透LCD不论透射区还是反射区都有很高的光透过率(>90%),同时二者灰阶特性重合度也很好。     

IER film and inkjet printing method for full-color transflective cholesteric LCD

A transflective cholesteric liquid crystal display (Ch-LCD) is demonstrated by using the image-enhanced reflector (IER) film on the top of the transmissive region to provide the similar paths for both transmissive and reflective light, thus, to display same image color in any ambience, improving the image quality. For full color display, the inkjet printing was applied and the patterned Ch-LC droplet was successfully deposited on the substrate. Thus, full-color Ch-LCD can be fabricated by IJP.     

A Simple Transflective LCD for Mobile Applications

A double-cell-gap transflective liquid crystal display (TR-LCD) based on 63.6$^{circ}$ twisted nematic mode is proposed. With only one uniaxial positive A-film in transmissive region, this normally black TR-LCD exhibits several attractive features, such as high optical efficiency, low operation voltage, acceptable viewing angle, and good cell gap tolerance. Moreover, the electro-optical characteristics of reflective and transmissive regions match with each other well. Its fabrication process is fairly simple and it is suitable for mobile applications.      

Novel Color-Sequential Transflective Liquid Crystal Displays

A novel transflective liquid crystal display architecture and its system driving schemes are proposed. In the reflective mode, the ambient light is used to readout the displayed images. While in the transmissive mode, a color-sequential light emitting diode backlight is used to eliminate the color filters. Under such device configuration, several advantages such as increased brightness and maximized color saturation for both transmissive and reflective modes can be achieved     

低功耗大尺寸胆甾型液晶显示器的发展

与主动发光型显示器相比,反射型显示器具有功耗低,特别是适用于低能耗系统的优势。但在某些情况下,系统的功耗往往大于显示器功耗。     

Transflective In-Plane Switching Liquid Crystal Display

A single cell gap, single gamma curve, and low operating voltage transflective liquid crystal display (LCD) using an in-plane switching (IPS) cell is proposed. In the IPS cell, the pixilated transparent indium tin oxide electrodes are on the top substrate and the reflectors are on the bottom substrate. The electro-optic properties of the transflective IPS LCD are calculated using three-dimensional simulation software. By optimizing the reflector width, the voltage-dependent transmittance and reflectance curves can be matched     

Dependency of spectral reflectance on rotating direction of liquid crystal for reflective liquid crystal displays

Unlike transmissive liquid crystal display (LCD), spectral reflectance of reflective LCD along normal direction was observed to be different for left and right rotation of LC molecules or different domains. Characteristics of spectral reflectance distribution were analyzed. This dependence of spectral reflectance can be used to modify spectral reflectance distribution of reflective LCD at nonzero gray levels.     

Assessment of Mobile Technologies for Displaying Medical Images

We compared the characteristics of state-of-the-art mobile display systems based on reflective and transmissive liquid crystal displays (LCDs) and an organic light-emitting display with respect to physical characterization metrics and observer studies. Physical performance factors provided information on the differences among display technologies. Observer studies resulted in different system ranking between the task-based performance and user-preference approaches. The results of the physical characterization and preference study showed that the reflective LCD ranked lower. We also found that ambient illumination played a lesser role than previously seen in large-format workstation displays. The methodology developed in this study provides an initial insight into the comparison of alternative technologies for display of diagnostic images in small portable devices.      

三极FED分段复合衬底电极的特性和制作

结合丝网印刷技术、烘烤工艺和烧结工艺,采用印刷ZnO层和银浆层相结合的方案,进行了分段复合衬底电极的制作。该分段复合衬底电极能够降低无效的阴极电压降,增强三极场发射显示器的发光亮度并改善其发光均匀性,且制作成本低廉。分段复合衬底电极避免了过长过细衬底电极现象,促使碳纳米管提供更多电子,同时有效改善了碳纳米管的场发射均匀性。利用碳纳米管作为阴极材料,进行了三极场发射显示器的研制,并进行点阵图像显示,从而证实了这种分段复合衬底电极制作工艺的可行性。与普通银电极场发射显示器相比,分段复合衬底电极场发射显示器能够将开启场强从1.92 V/μm降低到1.81 V/μm,其最大场发射电流由1 332.5μA提高到2 137.8μA,具有典型的场致发射特性以及优良的图像发光均匀性。     

A liquid-crystal display panel using an MOS array with gate-bus drivers

A 220- × 240-element liquid-crystal 2-in television display panel, using an MOSFET/capacitor array with gate-bus drivers integrated onto the same silicon substrate, has been developed. A gold-nickel alloy and polyimide resin have been applied as reflective display electrodes and insulating interlayer, respectively. In this panel, considerable reduction in the number of interconnections and good display contrast have been attained. MOS array construction and fabrication, gate-bus driver circuit configuration, and panel performance are described in this paper.     

透反液晶显示器在头盔显示器中的应用

在强光条件下头盔显示器高亮度显示带来的视觉模糊问题较为突出,透反液晶显示器能够较好地解决这个问题,设计了光敏电阻控制电路感知外界光线强度,控制透视模式和反射模式的切换,并给出了电路安装的方案,仿真试验取得了较好的效果,具有良好的应用前景.     

Analysis of fiber Bragg gratings for dispersion compensation inreflective and transmissive geometries

Numerical analysis of the dispersion-compensating properties of fiber Bragg gratings (FBGs) in both reflective and transmissive modes is presented. First, the sensitivity of chirped, reflective gratings to the grating chirp parameter, index modulation, and grating length is examined, showing that apodization provides lower sensitivity to variations in these parameters. Second, we introduce a new transmissive geometry for grating-based dispersion compensation that utilizes the dispersive properties of a uniform Bragg grating in transmission     

光子晶体Bragg镜的相移特性及腔模研究

研究了光子晶体Bragg镜的反射相移及透射相移,发现随着入射光频率的增大,相位均在增大。在中心频率附近反射相移和透射相移都与频率成线性关系。利用泰勒展开式的一级近似,得到了中心频率附近反射相移和透射相移的一级近似解析解,它们能很好地描述相移的变化规律。利用相移特性研究了Bragg微腔的共振模随微腔厚度的频率变化特性,同时亦给出了中心频率附近共振模频率的一级近似解析解。     

Broadband resonant filter using surface-shear-wave mode and twin-turn reflector

A broadband resonant filter of a fractional bandwidth of up to 6% with an insertion loss under 3 dB has recently been developed using a surface shear wave mode on an LiNbO3 Y-X substrate. The filter is realised on a substrate with thin metal electrodes, comprising a twin-turn reflector (two 3 dB multistrip couplers and four reflectors) and two interdigital transducers, without using additional matching inductors.     

一种采用内部线栅偏振片的半透半反射式液晶显示器

为了同时获得具有高透射率和反射率的液晶显示器,提出了一种采用内部线栅式偏振片(wiregridpolarizer,WGP)的单倍盒间距的半透半反式液晶显示器方法。在反射模式中,液晶盒内嵌的WGP作为依赖于偏振的外界光的反射器;在透射模式中,不需要消色差的四分之一波片。基于液晶盒的初始取向,该器件可用于正常显黑模式(垂直取向)和正常显白模式(扭曲向列相取向)。本文研究了这两种器件结构详细的电光特性,如电压依赖光效率特性和视角特性。     

Effects of transparent bottom electrode thickness on characteristics of transparent organic light-emitting devices

We conduct both simulation and experiment studies of impacts of simultaneously varying the thicknesses of transparent bottom electrodes and semi-transparent top thin metal electrodes on optical characteristics (e.g., transmission, reflection) and efficiencies of transparent organic light-emitting devices (OLEDs). For the thickness range of both electrodes studied, the total electroluminescent (EL) efficiencies (including both bottom and top emission), EL spectra, and emission patterns remain similar; yet the ratio of top to bottom emission would be modulated by the semi-transparent top metal electrode thickness. The thickness of the transparent bottom electrode has weak effects on the efficiencies of top/bottom/total emission, but it does have definite effects on optical transmission/reflection spectra (e.g. peak/valley wavelengths). Meanwhile, the thickness of semi-transparent top metal electrodes mainly affect magnitudes of the optical transmission/reflection. Transmissive/reflective hues and appearances of the transparent OLEDs can thus be tuned by the thicknesses of bottom/top electrodes. Overall, we demonstrated efficient transparent green phosphorescent OLEDs exhibiting a high peak transmittance of up to 81% and rather high total external quantum efficiencies of up to 21–21.5% (corresponding to a total current efficiency of 80–82 cd/A and total power efficiency of 95–99 l m/W), among the highest (if not the highest) for planar transparent OLEDs using no other optical out-coupling structures. By varying the thicknesses of transparent bottom electrodes and semi-transparent top metal electrodes, the ratio of top to bottom emission, and the transmissive or reflective hues/appearances of transparent OLEDs in the off state can be tuned, yet without sacrificing total EL efficiencies or changing their EL colors/patterns. Such tunable optical characteristics of transparent OLEDs may find some interesting applications.     

A transflective liquid crystal display using an internal wire grid polarizer

To obtain high transmittance and reflectance simultaneously, a single cell gap transflective liquid crystal (LC) display using internal wire grid polarizer (WGP) is proposed. For the reflective mode, the imbedded WGP serves as a polarization-dependent reflector for the ambient light. For the transmissive mode, no achromatic quarter-wave film is needed. This device can be used as a normally black mode (using vertical alignment) and a normally white mode (using twist-nematic alignment), based on the initial LC cell alignment. Detailed electro-optic performance, such as voltage-dependent light efficiency and viewing angle of these two device configurations, is investigated.     

Phase-induced intensity noise in Bragg-grating-pair delay line signal processors

Investigation of the phase-induced intensity noise generated by fibre Bragg-grating-pair delay line signal processors is presented. The phase noise expressions of the transmissive and reflective Bragg-grating-pair structures are derived for the first time. They show that the transmissive and reflective structures have different phase noise spectra even though they have the same transfer characteristic. Experimental results are presented to verify the theory.