Lapped transform‐based codec for frame‐memory reduction in super‐quality LCD overdrive

Abstract— Overdrive is commonly used to reduce the liquid‐crystal response time and motion blur in liquid‐crystal displays (LCDs). However, overdrive requires a large frame memory in order to store the previous frame for reference. In this paper, a lapped transform‐based codec (LTC) is proposed to reduce the frame memory needed for LCD overdrive. In the latest literature, a directional prediction‐based codec (DPC) employs eight directional predictions, which takes up a large percentage of the computational complexity of the codec and does not consider the de‐correlation of the inter‐blocks. Therefore, the LTC first uses the lapped transform to decompose the correlation of the inter‐blocks in the YUV color space. A hadamard transform is then used for energy compaction. The reordered coefficients are pre‐quantized and encoded using the proposed adaptive bit‐plane coding (ABPC) method for a simple hardware implementation. The simulation results show that the proposed LTC significantly improves the DPC in both subjective and objective performance and outperforms the block truncation coding (BTC) and adaptive multi‐level BTC (AM‐BTC), which have been described in the literature.     

Survey of actual viewing conditions at home and appropriate luminance of LCD‐TV screens

Abstract— To understand actual viewing conditions at home is important for TV design. And the preferred luminance level of LCD TVs under actual viewing conditions is also important in order to obtain both good picture quality and low power consumption. The actual viewing conditions of households and the preferred luminance levels was investigated. In a field test of 83 households, the display luminance, screen illuminance, and viewing locations were measured on site. In laboratory experiments, young and elderly subjects adjusted the luminance of an LCD‐TV screen to their preferred levels under different screen illuminance levels, angular screen sizes, and average luminance levels (ALL) of the images. As a result, two equations, which represent the preferred luminance level of LCD‐TV screens corresponding to different viewing conditions for young and elderly subjects were obtained. When the ALL of the images was 25% and the screen illuminance and angular screen size were set at 100 lx and 20°, respectively, the preferred luminance was 1 60 cd/m² for the young subjects and 248 cd/m² for the elderly subjects. By using the setting of the preferred luminance of an LCD TV under actual viewing conditions, it is possible to conserve energy consumption.     

A new vertical‐alignment LC mode with high‐transmittance and fast‐response‐time features

Abstract— A novel pixel design for vertical‐alignment LCDs with superior transmittance has been developed. The new liquid‐crystal mode, refered to as the hole‐induced vertical‐alignment mode (Hi‐VA), uses a via hole of an organic layer on a TFT substrate to achieve multi‐domain alignment. Compared to the conventional design, the Hi‐VA mode has a transmittance of up to 135% with a contrast ratio of 2000:1. Moreover, the new structure is free from ITO patterning or protrusion on the color‐filter side, which makes the fabrication process simple and low cost.     

基于VxWorks的OpenGL图形界面开发

提出一种基于VxWorks的OpenGL图形界面开发方法。研究VxWorks下的OpenGL图形解决方案及汉字生成的基本原理,提取字符的点阵信息生成点阵字体,使用FreeType产生矢量字体。将字体以OpenGL的方式绘制在图形中,实现基于VxWorks的中文图形界面。应用结果表明,该方法具有可行性和实用性。     

基于Mega169的空调控制器的设计

采用单片机技术,设计了一种车用空调控制器.控制器可对空调的各个部件进行控制,实现制冷制热、调整风量及控制风口的变换等操作.系统采用液晶显示屏显示,由程序控制实现各个环节的功能,方便了汽车驾驶员的操作.该设计具有很高的实用价值,可适用于现有的大多数汽车以及工程车.     

基于EasyARM1138的电能收集充电器设计

设计了基于EasyARM1138嵌入式处理器为控制核心的电能收集充电器,阐述了电能收集器的硬件电路结构、工作原理及软件程序设计.根据充电电池取样电流与电压状态信息,EasyARM1138产生合适的PWM信号,并控制BUCK变换器工作,实现充电高效控制.本电能收集充电器具有数字化、智能化的特点.     

接触网测试仪显示设计

中铁路接触网测试仪是基于TI公司的TMS320F2812数字信号处理芯片的检测系统。结合F2812本身强大的功能,搭配松下公司生产的型号为LTM024D250的液晶,提供实现检测系统的实时工作状态显示——采样数据、波形、设备号等,给现场检测人员提供直观的显示。     

基于Micro2440视觉处理平台的构建

采用Micro2440开发板和OV9650摄像头,成功获取了视频图像,并且能够对视频中的每一帧图像同步进行自定义的图像处理,其处理的结果同时能够在LCD上予以显示.实验结果证明该视觉处理平台具有良好的视觉处理特性,适合作为数字图像处理平台,为进一步的图像处理、功能扩展以及嵌入式应用创造了条件.     

基于单片机的开关电源检测系统的研制

根据某军用雷达所用开关电源的要求,设计了一种安全可靠的开关电源检测系统。分别介绍了各个外部扩展模块的电路以及主要模块的驱动程序,最后分析了系统实时操作的实现,讨论了系统的资源分配,提出了驱动程序和操作系统的优化方案。该检测系统充分利用LCD附带的存储器,实现了缓存机制,提高了工作的安全性和实时性。投产后的使用表明,该检测系统运行稳定可靠。     

基于LPC1100的温度检测网络节点设计

基于NXP公司LPC1100系列处理器设计了一种温度检测网络节点。介绍了网络系统的整个设计方案和温度检测网络节点的硬件设计,并给出功耗管理、温度传感器和ZigBee三个软件模块的具体软件设计方法。