航空液晶显示模块加固优化分析

加固液晶显示模块在温度变化时,由于光学胶、加固玻璃、偏振片等元件的热膨胀系数、弹性模量、泊松比的不同,会对液晶产生额外的热应力。针对加固液晶显示模块建立有限元分析模型,仿真分析了高温环境下不同光学胶厚度、不同光学胶工艺和不同加固玻璃厚度对液晶屏的影响。仿真结果表明:当加固玻璃的厚度为2.3 mm,光学胶的厚度为300μm,采用固化后弹性模量为1.65E7 Pa、热膨胀系数为1.2E-3/℃、泊松比为0.44的光学胶固化工艺,模块的变形量、应变和应力值最小,有利于保证模块的显示性能。     

LED背光对LCD色彩的影响

通过试验研究了不同驱动电流下LED背光透过液晶器件时TFT-LCD白色色度坐标在驱动电流影响下的变化规律、LCD的红绿蓝3色辉度以及LCD色域与驱动电流变化的关系。实验结果表明液晶屏平均亮度和液晶屏中心RGB亮度随驱动电流呈线性变化,而液晶屏中心色域值几乎与驱动电流变化无关。     

基于热电制冷的大功率LED散热性能分析

提出了一种新型的基于热电制冷的大功率LED热管理方法。这种大功率LED阵列模块采用板上封装技术制造。为了解决散热问题,采用了热电制冷器将LED芯片产生的热量转移到周围的环境中。利用热电偶测量了大功率LED阵列模块在不同工作条件下的温度分布,LED的光学性能则通过光强分布测试仪来测试。结果表明,这种采用热电制冷的大功率LED阵列封装模块能够显著降低器件的工作温度,与不采用热电制冷器相比,基板温度能够降低36％以上,光学性能测量表明LED阵列模块的发光效率达到30．18lm／W。     

带过温保护功能的LED恒流驱动电路设计

本文设计了一种带过温保护功能的LED恒流驱动电路。该电路由恒流驱动模块和温度传感模块组成,能在设定温度下同时控制两个开关NMOS管,实现过温保护功能。恒流驱动模块采用的方案能够有效降低恒流工作电压并实现利用外接电阻控制恒流输出的大小,驱动电流范围为54.26mA到258.24mA。当驱动电流为258.24mA时,恒流工作电压仅为0.35V。在LED电源电压正负变化10%范围内,驱动电流变化小于5%。温度传感模块利用PTAT(与绝对温度成正比)电压与基准电压比较,产生关断信号,关断温度在60℃~100℃范围内可由外接电阻设定。     

Senbot新品出炉

主机自带充电线路电池模块,2h充满可用8h,抗干扰设计,声音清晰通透。专业无线系统主机分LED数码管或LCD液晶显示2个版本,其中LED数码管版本适合T作环境恶劣的场合（-40-65℃,相对温度〉65％,沙尘天气）。且价格相对低廉。LCD液晶显示版本则因液晶屏本身不可克服的局限性,需在相对较好的环境下使用且成本有所上升。     

加固屏高温显示特性分析

应用于高温环境下的加固液晶屏通常会出现显示不均问题,严重影响显示效果。针对这个问题,提出了利用试验和有限元仿真相结合的方法对加固液晶屏高温显示特性进行分析。首先利用有限元仿真软件对液晶原屏和加固液晶屏进行热力学仿真,分析液晶层厚度的变化,再对其进行热力学试验,并与仿真相对比,最后结合仿真和试验结果得出:出现显示不均(Mura)现象的位置处液晶层的厚度发生了明显的变化,并且随着液晶层厚度变化增大,Mura现象更明显;高温环境下加固液晶屏较容易出现Mura,且不同厂家的液晶屏出现高温显示Mura的概率不同。为了降低高温环境下Mura出现的机率,建议对原屏进行筛选。     

一种基于FPGA伪彩液晶显示系统的设计

根据场序法彩色液晶显示原理和功能要求,基于XILINX公司Spartan3系列FP-GA,采用硬件描述语言Verilog设计了一种伪彩液晶显示控制电路,并利用单色液晶屏和三基色的LED背光源完成了场序法伪彩液晶显示控制系统的设计与实现。仿真和测试结果表明,该系统的设计控制灵活可靠,能够实现场序法伪彩液晶显示时序和控制功能。     

一种基于FPGA伪彩液晶显示系统的设计

根据场序法彩色液晶显示原理和功能要求，基于XILINX公司Spartan3系列FPGA，采用硬件描述语言Verilog设计了一种伪彩液晶显示控制电路，并利用单色液晶屏和三基色的LED背光源完成了场序法伪彩液晶显示控制系统的设计与实现。仿真和测试结果表明，该系统的设计控制灵活可靠，能够实现场序法彩色液晶显示时序和控制功能。     

液晶显示模块振动分析与减振加固方案

机械振动是大尺寸加固型军用液晶显示模块损坏的重要原因,为了提高加固型液晶模块的质量,需要在强振动情况下,对液晶模块的受力、能量传递和分布进行分析,本文中首先根据液晶模块的结构,采用了由4块平板建构成的盒式结构模型,然后通过能量强度和能量的传递等计算,研究大尺寸加固型军用液晶模块的振动。通过上述分析,可以得出机械振动能量的主要分布、共振峰的位置等,结果表明在垂直于耦合边缘的方向上受力最强,在此基础上提出了一套可行的解决方案。文中的研究结果为进一步改进液晶屏的质量,提供了理论基础。     

LED和荧光粉光谱数学模型

提出了LED光谱数学模型,并对在不同驱动电流条件下红光、黄光、绿光和蓝光LED的光谱分布进行了实验验证。结果表明此光谱模型拟合的LED光谱分布非常接近实际测量光谱分布,优于其他光谱模型,并表明此光谱模型同样适用于荧光粉。进一步对白光LED光谱分布和显色性进行了仿真模拟,结果也表明提出的新光谱模型优于其他光谱模型。     

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