特种液晶显示器背光源研究

特种液晶显示器对背光源提出特殊要求。介绍了特种液晶显示器用背光源的主流类型CCFL(冷阴极荧光灯)和LED(发光二极管)。从亮度、功耗、色彩、可靠性等方面详细讨论了各自的技术特点。分析了LED背光源在特种液晶显示器技术中的重要地位。     

液晶显示器背光源的现状及发展

随着液晶显示器的不断发展与进步,对背光源的要求也越来越高。本文简要介绍了液晶显示器现已使用的背光源和正在研制的背光源的构造原理、特性及发展情况。     

反射式液晶显示的模拟计算(英文)

反射式液晶显示器因不需要背光源,有功耗小等优点.对于反射式彩色液晶显示器来说,其主要的问题是其反射的亮度低.光学干涉高反射膜有良好的反射特性.我们提出了采用光学高反射膜作彩色反射膜来制作彩色液晶显示器,并用计算机模拟的办法对其进行了研究.对膜的材料及视角优化也进行了讨论.     

广视角液晶显示器设计

为了实现液晶显示器的广视角显示,论文详细阐述了一款54.6cm(21.5in)液晶显示器的广对比度视角液晶面板及广亮度视角背光源的设计原理和方法。介绍了边缘场开关模式液晶面板的设计方法及结构,从原理上阐释了此液晶面板具有广对比度视角的原因;介绍了背光源亮度视角的设计方法,通过对背光源中多组光学膜层架构的测试和数据对比,得到了具有最广亮度视角的膜层架构。根据上述原理进行实际模组样品的制作并进行实测,数据结果显示此款液晶显示器的对比度视角可达90°/90°/90°/90°,且在水平方向的1/2亮度视角可达60°,相应的亮度视角均一性为1.20。通过对比其他同类产品的实测数据,表明此款液晶显示器无论在对比度视角还是亮度视角方面都远优于同类产品。     

液晶显示器的背光源

背光源是透射式显示器不可缺少的重要光学器件,随着液晶显示器向大屏幕、易读性、全色化方向的发展,背光源在其显示中的作用越来越受到重视。但背光源的存在影响了液晶显示器的薄型,低功耗等优点。因而对背光源的要求越来越高。本文较系统地阐述了液晶显示器对背光源的性能要求、对背光源的选择及光源的放置方式,探讨了一些显示特性（亮度、功耗、颜色的协调性、透射光的指向性、对比度等）存在的有关问题,并介绍了背光源的最新发展。     

裸眼立体显示器系统结构研究

裸眼立体显示器是不需要佩带助视眼镜的立体显示设备．它使用特殊的光学元件改变显示器和人眼的成像系统。文章讨论基于狭缝背光照明的液晶立体显示器的原理及其组成结构。利用通用的TFT LCD液晶显示器作为图像显示部件，通过科学设计符合立体显示照明原理的照明板部件．与液晶盒精密装配在一起组成裸眼立体显示屏，配合电路系统和显示软件完成裸眼立体显示器的系统结构设计。     

液晶显示原理篇(六)

大型液晶显示器用背光照明系统是平板背光照明系统的主要市场,主要用于笔记本电脑的液晶显示器、台武液晶显示器等处,如用多只荧光灯的直下式背光照明系统,厚度一般为15-20mm,重量大于0.5kg,功耗约为10W,而用侧导光式单管(CCFL)背光照明系统,厚度只有35mm,重量约为100g,功耗约为1W左右,它的结构完全符合便携式设备的狭框架、超薄型、重量轻和低功耗的要求,已成为大型液晶显示设备首选的配套产品。下面简要介绍以下侧导光式CCFL背光照明系统的基本工作原理。     

基于狭缝光照明的3D-LCD光学结构分析

本文在分析立体视觉机理的基础上，介绍了一种以液晶显示器为基础的平板立体显示器。利用狭缝背光源照明液晶层，使得显示在液晶层的纵向条形左右图像，分别被观看者的左右眼观看到，从而形成自由立体图像。本文从光学的角度，对立体视觉机理、立体显示原理、用于液晶立体显示的狭缝背光源的光学原理作了详细分析。     

液晶显示器的照明与亮度

一般用户在选择液晶显示器时，很少考虑液晶显示器的灯管技术，在目前的液晶显示器产品中，大多数生产厂商也是单纯追求一个“高亮度”而忽略灯管技术。实际上，灯管的数量及排列组合方式对液晶显示器的品质和使用者的视力健康影响较大。     

空间用液晶显示器关键技术研究

按照空间特殊环境的要求,重点设计了液晶显示器的多功能光学窗口、液晶屏加热器、白光LED背光源和光学膜组等关键部件,达到了空间用液晶显示器表面减反射、电磁屏蔽、低温下启动、背光亮度较高和均匀性好、显示效果理想、高可靠性等具体技术要求.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks