先进的LED驱动器提升全彩视频显示屏的质量

本文介绍了全彩LED视频显示屏的结构以及对LED驱动器的要求,详细介绍了意法半导体为全彩视频显示屏定制的LED驱动器解决方案。     

液晶显示不同颜色编码搭配方式的工效学研究

当今大屏幕显示已成为未来战斗机座舱设计的主流,因此,我们有必要以中国飞行员为对象,系统的研究液晶显示器的视觉工效,为机载液晶显示器的研制及应用提供工效学实验数据具有重要的意义。方法:通过依托于PC机的颜色搭配编程实验获得了97名飞行员观察液晶显示器时的颜色特征数据。结果:对五种颜色的12种配色方式进行方差分析,比较结果显示12种配色方式间有显著性差异(P<0.01);对12种配色方式间的多重比较的LSD-t检验显示搭配方式2和方式1,3,4,6,7,8,9,11,12有统计学差异(P<0.01)。但与5,10间无统计学差异。结论:5种颜色推荐的搭配方式:a.绿、黄、品红、蓝、红;b.黄、红、青、蓝、品红;c.红、品红、青、绿、黄。     

Basic investigation of noncontact transportation system for large TFT-LCD glass sheet used in CCD inspection section

Recently, thin film transistor liquid crystal displays (TFT-LCDs) have been successfully applied to desktop personal computer (PC) monitors and televisions. Higher resolution and larger mother glass sheets have been required for television displays in particular to reduce costs and improve production efficiencies. To handle the increasing resolution and mother glass size, high-speed inspection processes for detecting defects in TFT arrays using charge coupled device (CCD) cameras are becoming very important. Therefore, a noncontact transportation technique for the high-speed inspection section is necessary, to avoid damage to the glass sheet during the inspection process. In addition, high-speed CCD cameras with high resolution, large magnification and shallow focus depth are usually used in the inspection process. Accordingly, it was reported that fluctuations of less than 20 μm in the floating gap of the LCD glass sheet were required. We have used a 240 mm square LCD glass sheet as the first step of this study and an air-pad system using porous metal was investigated to support the glass sheet. The influence on the flatness of design parameters such as the nonuniformity of the permeability of the porous air pads and the appropriate combination of supply and exhaust pressures were investigated numerically for a glass sheet that was quiescently supported by the proposed air-pad system. Moreover, the numerical results are compared with experimental results to verify the validity of the numerical predictions. We found that the flatness of the glass sheet of less than 15 μm could be achieved experimentally with a floating gap of around 30 μm by using the proposed air-pad system.     

高清液晶电视LCD屏检测仪的设计

介绍了一种高清液晶电视LCD显示屏的检测仪器,该仪器具有体积小巧、造价低廉、方便实用的特点。系统的核心控制单元为FPGA芯片,可以在无显卡支持的情况下,控制产生VGA行、场同步信号,由VGA端子向高清显示器输出多种静态和动态检测图样,并可支持640×480@60Hz、1280×1024@60Hz、1920×1080@60Hz多种主流分辨率的测试。     

世界TFT LCD产业现状

网络与无线通信技术的发展及其产品的迅速普及，全球数字化进程的快速推进，促成了信息技术（ＩＴ）与产业的蓬勃兴起，也为映像和信息显示技术创造了广阔的市场和良好的机遇。各种平板显示技术成为人们研究开发的热点。其中，液晶显示器脱颖而出，以其低功耗、轻巧便携和可与微电子技术匹配的特点率先进入市场并不断拓宽其应用领域。薄膜晶体管寻址的液晶显示器（ＴＦＴ ＬＣＤ）又以其大容量、高清晰度和全彩色的视频显示成为目前信息显示领域的主导技术，并形成了完善的产业环境，相关的高新技术产业也成为该领域的主要投资方向。 ＴＦＴ…     

GOA型TFT LCD产品Shorting Bar Testing工序烧伤现象研究

GOA型TFT LCD产品Shorting Bar testing工序烧伤现象严重,针对把根源归结为Shorting Bar Testing工序测试参数电压过高的假设,设计一个Source电压远高于理论测试电压的测试波形,分别以高压值参数和理论值参数对样品进行测试,结果发现两种情况下烧伤概率一样;针对把根源归结为Shorting Bar testing工序驱动程序启动瞬间冲击烧伤的假设,在测试驱动板上每个测试信号输入口加一个限流器,用加限流器和没加限流器的测试治具分别对样品进行测试,结果发现两者烧伤概率一样;针对把根源归结为静电击伤的假设,在Shorting Bar testing工序增加防静电措施,分别在改进前后的测试环境对样品进行测试,发现改进后未出现烧伤现象。可见出烧伤现象的根源在于静电,而非其他原因。     

基于STC89C51单片机的电子琴设计

介绍了一种基于STC89C51单片机的电子琴的电路设计方法。该方法利用单片机定时器来产生固定频率的方波信号以推动喇叭发出旋律,并使用LCD显示器来显示音阶输入的相关消息,然后通过按下键盘组中的相对按键使喇叭发出相对音阶单音,并自动存储所输入的单音,之后再一起自动演奏出来,从而实现具有存储功能的电子琴系统。     

Determination of the limiting current density in electrodialysis desalination as an empirical function of linear velocity

Electrodialysis is known to be a useful membrane process for water desalination. The limiting current density (LCD) in the electrodialysis process is an important parameter which determines the electrical resistance and the current utilization. Usually, LCD depends on membrane and solution properties as well as on the electrodialysis stack construction and various operational parameters such as the flow velocity of the diluate solution. Therefore, a reliable determination of LCD is required for designing an efficient electrodialysis plant. In this study, LCD was measured in an electrodialysis flow cell system of given geometry and spacer configuration as a function of the linear velocity. The coefficients a and b of an equation describing LCD as a function of the linear flow velocity of the diluate solution, i_lim=aCu^b, were determined from a plot of the measured LCD over the electrolyte concentration versus the linear velocity on a double logarithmic scale. It was found that the coefficient b was related to the hydrodynamic conditions, while the coefficient a was affected by the cell geometry, electrolyte concentration and the membrane properties.     

汽车黑匣子显示功能模块的研究与设计

汽车黑匣子是当今研究领域的热点之一。它能完整、准确地记录汽车行驶状态下的有关参数，为车辆管理部门提供一个高效、可靠的管理平台。介绍了以AT89C55微控制器为核心的汽车黑匣子显示功能模块的设计，着重介绍了该模块硬件、软件的设计及其功能。     

基于嵌入式系统的状态显示器设计

现代化军队应具有复杂恶劣条件下的作战及生存能力,这同时也对军用武器系统提出更高的要求。采用嵌入式系统,设计符合军用条件的状态显示器,核心元件选用基于ARM9体系结构的微控制器,外围设计CPLD电路,驱动加强型液晶显示器件。选用实时操作系统μC/OS-II,设计开发驱动程序和应用编程。测试、测评符合军品设计要求,并已广泛应用于多军种中。