激光显示光源颜色配比和色温研究

为了实现对激光投影白平衡的实时控制,根据CIE1931和CIE1964标准色度系统,对激光红绿蓝三基色组成的激光光源进行了颜色配比和色温研究。首先,根据格拉斯曼颜色混合定律,介绍了三基色混合白光色坐标和色温的获得方法。接着,理论计算了红(638nm)、绿(532nm,520nm)、蓝(445nm)激光器在目标色温6500和9300K下的功率配比,分析了实现6500~9300K连续可调对应的功率配比变化;然后,对绿光波长变化对色温和亮度的影响以及功率下降引起的色温变化进行了分析。最后,搭建了激光光源色温测试实验系统,相比按照标准功率配比计算的理论色温值,实验获得的色温结果偏低约15%。     

双通道PWM的冷暖白光LED混色模型研究

LED光色度的动态调节是实现智能照明的基础, 采用冷暖白光LED和双通道脉冲宽度调制(PWM)法,基于1931CIE标准建立混合光源模型,推导出混合光源色坐标、相关色温 、最大亮度、显色指数与双通道调制脉冲 占空比比值的关系式。采用暖白光(色温3282 K)和冷白光(色温12930K)两种白光LED进行 混色实验, 通过微控制器输出PWM信号控制LED驱动电源,改变冷色光和暖色光的比重,得到的混合 光源色坐 标、最大亮度、相关色温及显色指数值与理论计算值吻合很好,证明了理论模型的正确性。 理论和实验结 果还表明,混合光源在双通道调制脉冲占空比比值为1的附近可得到低色温、高显色性和大 光通量的混合白光。     

用于背光模组的三基色微细导光管的设计研究

提出了一种用于背光模组的三基色微细导光管的设计方案。该导光管结构可取代传统的线光源冷阴极荧光灯管(CCFL),并保留其导光板设计成熟的优点,在保证环保、提高对比度的同时将色域提高150%。对三基色微细导光管在光学软件中进行建模,并理论推导能够均光的网点半径排布规律,将该微细导光管与三基色LED光源相结合实现时间混色,省略彩色滤光片,提高光能利用率及空间分辨率。模拟实验表明,该微细导光管的光能利用率达66%以上,亮度均匀性达95%。取代CCFL后结合时间混色技术实现色序法显示,该新型背光源的总体光透过率为12%,较传统的CCFL背光源光透过率提高一倍以上。     

一种新型白光LED模组驱动电路的设计

为了改善白光LED模组的照明质量,实现对白光LED模组色温的调节,通过分析白光LED模组的驱动电路技术,提出了一种新型白光LED模组驱动电路的设计方案。该驱动电路中利用PWM方式驱动RGB三色LED,并通过光强反馈来分别控制三色LED的PWM信号。该电路具有稳定输出光功率的功能,另外还可以调节输出光的色温和光强,达到了良好的照明效果。     

彩色LED背光源调频调光与混色方法

介绍了一种使用橙、绿、蓝三基色LED灯作为背光灯的平板显示模块背光源。本背光源亮度的调节通过变频调光技术实现。最终的标准白色光利用这种三色灯的调光脉冲高电平时间混色的方法得到,并按照光传感器输出的数据来微调三色灯调光脉冲高电平时间。这种调光与混色的方法可以有效改善由于温度变化带来的背光源亮度、色温变化与色坐标漂移。     

新品

<正>Barco(巴可) Freya+网址：www.barco.com欧美顶级投影机品牌巴可推出了采用RGB三基色的超高亮度投影机Freya+，峰值亮度达到了13500ANSI流明，可以在7.8米的距离下投射出308英寸的小巨幕。得益于机身当中RGB三基色固态激光光源系统，Freya+能够呈现出极为逼真的色彩还原，色域覆盖范围在去年就已经能完整覆盖DCI-P3色域范围。而最近巴可为Freya+升级了新一代的激光光源，从而使得它的色域覆盖范围更上一层面，     

高效暖白光器件的廉价制备及其相关材料研究

低色温光源由于其对抗黑变激素具有较低的抑制作用而成为生理友好照明的首选。同时,高的能量效率对于节能也至关重要。本课题采用温和的溶液旋涂方法分别制备了含互补色、三基色和四基色磷光染料的单层有机白光二极管(WOLED)。经过优化WOLED的结构,实现了宽亮度范围内100~10 000cd/m2的低色温(low-CCT)白光发射。CCT低至2 500K以下、显示指数(CRI)高达到83、电流效率在亮度为1 000cd/m2时达到了17.8cd/A,与传统的白炽灯功效相当。高发光性能、廉价制备成本及生理友好的特性表明,本工作制备的器件是益于人类健康的照明光源尤其是夜间照明光源的理想选择。     

基于二分法的RGB-LEDs配色研究

研究如何快速、精确地匹配三基色RGB的比例得到任意颜色的光具有重要意义.提出一种结构简单易于实现的RGB-LEDs配色模型,通过振幅调制电流来改变三基色LED辐射功率,从而调节各基色在混合色中的亮度比例,使得RGB-LEDs能够匹配到任意颜色.同时给出使用该模型进行配色的精确度评价指标.在此模型基础上提出一种基于二分法的RGB配色算法,使得混合颜色的色品坐标能够快速、精确地匹配到指定范围.仿真实验证明了算法的正确性和有效性.该算法收敛速度快,配色精确度高,具有很高的实用价值.     

OLED面板的彩色显示驱动技术研究

OLED(有机发光二极管)彩色化最常用的工艺方法之一是RGB象素独立发光法。在详细分析了各种材料的亮度稳定性和使用寿命后,得出OLED的白光材料具有更高的功率效率和稳定性,由RGB三色合成白光OLED会造成功率的浪费。据此提出了一种四色法:即发光材料除了红、绿、蓝(RGB)三色发光材料外,还有白色发光材料,由白OLED材料直接产生白光。文章首先介绍了这种方法的工作原理,然后对这种彩色OLED实现方式的驱动电路进行了详细的探讨。在保证原RGB三色显示的色彩和寿命的前提下,通过对每个RGB的电流进行换算,用RGBW四色实现了OLED的彩色显示。结果表明这种显示法在降低总的驱动功率的同时,还可对高分辨率面板的色彩平衡变化加以控制。     

彩色滤光片实现OLED彩色化的瑕疵分析

近来主要通过使用彩色滤色膜(CF)与使用RGB三色排列的方法来实现有机电致发光显示器(OLED)的全彩化、本文比较两种方式实现OLED全彩化的亮度以及表面平整度等光电参数后得出结论:CF在OLED实现全彩化的应用上依然面临一些问题,需要进行改进和优化,才能更好地实现OLED全彩化.     

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.     

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.     

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.     

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.     

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.     

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.     

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