基于LPC3250的微型投影系统设计与实现

本系统以高性能ARM9处理器LPC3250为核心,HX88xx为LCOS驱动芯片。HX70xx为LCOS模块,LQ035Q1DG01为LCD模块,建立μC／OS-Ⅱ嵌入式实时操作系统,通过红外控制实现系统在投影仪和LCD之间切换。本文重点阐述了系统主要接口硬件电路的设计和系统软件的实现。实现了寿命长、成本低、可靠性高的便携式微型投影系统的设计。     

单片机汉字显示系统的设计

设计了一种以AT89C51单片机为核心、ST7920为控制芯片、液晶显示器YM12864R为显示部分的液晶汉字显示系统,对汉字点阵字模的提取流程进行了分析和实验.系统具有调用内置字库和自定义字库的汉字显示功能,显示方便快捷,有很好的实用价值.     

基于龙芯SOC的LCD转VGA方案的设计与实现

GC3210是基于中科院计算所龙芯IP核的一款低功耗、低价格、高性能的嵌入式处理器,不支持VGA接口,无法与通用显示设备进行连接,采用FPAG或ADC实现VGA输出,成本太高,市场无法接受.文章根据市场应用的实际情况提出了一种基于GC3210处理器的LCD转VGA接口的低成本设计方案,讨论了LCD转VGA的总体设计,验证了方案的可行性,在验证过程中改进了方案.方案设计巧妙、成本低廉,已经在Thin Client产品中得到很好的应用,取得了很好的效果.     

基于嵌入式μC/GUI的图形特技应用研究

μC/GUI是一种用于嵌入式应用的图形支持软件,它给任何使用图形LCD的应用程序提供了一个不依赖于处理器和LCD控制器的图形用户接口.主要提出了μC/GUI的硬件平台构建,讨论了ARM7芯片S3C44BOX与LM7M632的硬件接口和软件设计,并在此基础上提出了一种基于嵌入式μC/GUI实现的图形特技算法,最后给出了实验结果.     

基于Framebuffer 的DSP 平台LCD 驱动程序的实现与应用

论述了在uClinux 中基于Framebuffer 的LCD 驱动程序的实现方法。首先主要介绍Framebuffe的处理机制以及底层驱动的接口函数,并在ADSP-BF561 平台上进行了具体实现;其次在Framebuffer 的基础上,简要介绍了嵌入式图形用户接口MiniGUI,并在ADSP-BF561 平台上进行了移植;最后通过实际效果测试,验证了工作的正确性。并将其应用于无线网络视频监控系统中的人机接口中。     

I2C总线在指纹识别系统键盘显示中的应用

针对大多数嵌入式系统键盘显示电路复杂、不灵活、维护困难等问题,结合指纹识别系统在汽车安全领域的应用,介绍了基于I2C总线的数码管显示驱动和键盘扫描控制芯片CH452S以及扩展口器件PCF8574AP在指纹识别系统键盘显示接口中的应用,包括硬件电路连接和软件程序设计.采用I2C总线,不仅占用端口资源少,电路结构简单,而且易于电路扩展与系统升级.     

A study of roll‐printing technology for TFT‐LCD fabrication

Abstract— Recently, potential breakthrough technologies for low‐cost processing of TFT‐LCDs and new process developments for flexible‐display fabrication have been widely studied. A roll‐printing process using etch‐resist material as a replacement for photolithographic patterning was investigated. The characterization of the properties of patterns formed in roll printing, a method to fabricate cliché plates for fine patterns, and the design of a new formulation for resist printing ink is reported. The pattern position accuracy, which is one of the most important issues for the successful application of printing processes in display manufacturing was studied and how it can be improved by optimizing the blanket roll structure is explained. New design rules for the layout of the thin‐film‐transistor array was derived to improve the compatibility of roll printing. As a result, a prototype 15‐in.‐XGA TFT‐LCD panel was fabricated by using printing processes to replace all the photolithographic patterning steps conventionally used.     

A new optical elasticity resin for mobile LCD modules

Abstract— The display used in current cell phones has an air gap between the cover glass and the liquid‐crystal‐display (LCD) module to prevent the LCD glass from being damaged. Reflections at the boundaries of the air gap cause a reduction in the LCD luminance and contrast. To address this problem, a newly proposed LCD structure has been investigated. The “Super View Resin (SVR),” a transparent elastic resin which improves the shock resistance and visibility of the LCD, has been developed. Filling the air gap between the cover glass and LCD module with a refractive‐index‐matching resin solves the light‐reflection problem inherent in the use of a reinforced cover‐glass lens. Moreover, the elastic filler works as a damper, reducing any external shock, which prevents not only the cover glass and LCD module from being damaged, but also the glass from being shattered when it is broken.     

Touch‐screen panel integrated into 12.1‐in. a‐Si:H TFT‐LCD

Abstract— A touch‐screen‐panel (TSP) embedded 12.1‐in. LCD employing a standard existing a‐Si:H TFT‐LCD process has been successfully developed. Compared with conventional external touch‐screen panels, which use additional components to detect touch events, the new internal TSP exhibits a clearer image and improved touch feeling, as well as increased sensing speed using discrete sensing lines to enable higher‐speed sensing functions including handwriting. The new internal digital switching TSP can be fabricated with low cost because it does not require any additional process steps compared to a standard a‐Si:H TFT‐LCD.     

Evaluation of moving‐line contrast degradation without motion

Abstract— A method for evaluation of the contrast of moving step‐grating patterns under smooth‐pursuit eye‐tracking conditions without imaging data acquisition and image analysis is introduced. Periodic optical responses of the display to a set of simple driving signals have been recorded at a fixed location, and the luminance vs. time data has been evaluated to obtain two types of contrast for characterization of the dynamical performance of the display under test: the frame‐convoluted contrast and the frame‐integrated contrast. The relation of this characterization with respect to modulation transfer functions from impulse responses and to the dynamic modulation transfer function from sine‐gratings is explained and discussed. The approach described here provides a detailed and comprehensive characterization of the dynamical properties of electronic displays including both extreme cases of step‐response and impulse‐response with quantities that are related to visual perception. With this type of evaluation, the visual resolution of displays can be described by the same characteristics in the static and the dynamic case. The method is attractive due to limited instrumental efforts and the transparent method of evaluation.