图形用户界面系统MiniGUI的IAL输入引擎开发

MiniGUI是一种面向嵌入式系统的图形用户界面支持系统，它采用分层设计的层次结构，定义了便于移植的图形抽象层GAL和输入抽象层IAL。本文针对网络故障测试仪触摸图形界面的开发与参数获取，介绍了MiniGUI的IAL接口，详细讲解了特定嵌入式系统输入引擎的开发过程，并对触摸屏坐标转换校正的方法进行了分析，给出相应的解决方案。     

基于嵌入式Linux系统的MiniGUI移植研究

基于PXA270开发板搭建了宿主机-目标板交叉编译环境,对MiniGUI移植和相关的Linux内核裁剪进行了研究,并编写了自定义的输入抽象层IAL程序,改进了MiniGUI的图形输入引擎,实现了底层硬件驱动与上层应用开发之间的输入接口交互,使基于此类开发板的MiniGUI应用程序能同时接受键盘和触摸屏两种输入设备的输入.应用结果表明,该方法可操作性强,具有一定的实用性和参考价值.     

船舶控制系统中鼠标和触摸屏兼容的接口程序设计

针对高可靠性系统需要同时具备鼠标器和触摸屏输入设备的应用场合,提出了鼠标器和触摸屏兼容的接口程序的设计思想.详细分析了触摸屏接口程序、鼠标驱动程序以及应用接口函数的设计过程,实现了鼠标操作和触摸屏操作的兼容.设计的程序在船舶智能控制系统中获得成功应用,对类似系统输入设备的接口程序设计具有较好的参考意义.     

基于SEP4020和MiniGUI的缴费终端设计

为解决市场上各种缴费终端的高成本问题,提出了一种基于arm7的嵌入式缴费终端的解决方案.对该方案进行了总体结构的设计,并考虑了在满足缴费功能的条件下设计所需的低端硬件平台.在这基础上选用MiniGUI作为图形人机界面,并分析了MiniGUI的体系结构和消息驱动机制,提供了触摸屏的校正方法并编写用户自己的输入引擎IAL,裁剪和移植嵌入式Linux系统,完成了MiniGUI在SEP4020上的移植.实验结果表明了该设计方案的可行性,且降低了成本,满足嵌入式缴费终端的应用要求.     

基于EFI的图形用户界面的设计与研究

可扩展固件接口(EFI)规范为启动操作系统前的程序提供了一个标准环境。NUWA系统是一个专门针对EFI环境开发的图形用户界面。该系统采用分层设计思想，其中的图形抽象层(GAL)与输入抽象层(IAL)定义了一组不依赖于任何特殊硬件的抽象接口，而用于实现这一抽象接口的底层代码形成了NUWA系统的“图形引擎”，类似于操作系统中的驱动程序。该文介绍了GAL与IAL的设计以及在EFI环境下GAL驱动程序的实现。     

基于SOPC的多波形信号发生器

设计了一种基于SOPC的多波形信号发生器,系统由核心主板和显示及输入模块组成,核心主板为Altera公司CycloneII系列的FPGA和高速DAC组成的片上系统开发平台,FPGA中配置NiosⅡ软核CPU、信号发生模块和相关的接口控制逻辑电路,显示和输入部分为分辨率240×320的TFT LCD触摸屏,负责界面显示和外部输入控制,采用直接数字频率合成DDS技术.经测试,系统精度高,稳定性好,得到波形平滑,灵活性和通用性好.     

触摸屏

触摸屏是多媒体信息输入的一种新型设备,提高了人机交互功能,各国都在积极地进行触摸屏的研制开发。触摸屏从低档到高档,从红外线式、电阻式走到电容感应式,现在又发展到表面声波触摸屏,更先进的体波声波触摸屏正在研制之中。触摸屏性能越来越高,技术也越来越先进。由于触摸屏的特点,对其有以下要求：透明度高、定位精确、长时间保持准确、工作稳定可靠、不影响美观和不易被破坏等等。触摸屏系统一般由三部分组成：1．传感器（触摸屏）：检测用户以触摸屏幕方式输入的信息。2.触摸屏控制部件：接受用户在屏上的触摸点信息,转换为数…     

便携式红外相机中触摸屏原理与应用

为了提高实验型红外相机的灵活性并研究其小型化技术,基于嵌入式系统技术构建了便携式红外相机.红外相机采用带触摸屏的液晶显示器(LCD)作为用户交互设备,其中触摸屏作为输入设备实现对相机的控制.设计了系统硬件,研究了Linux2.6内核下触摸屏的驱动原理,利用校正函数库Tslib进行了触摸屏校正,最后利用Qt/Embedded程序作为用户界面接收用户的触摸屏输入.实验结果表明,触摸屏设备在便携式红外相机中能准确控制系统.     

嵌入式Linux触摸屏在漆包线检测系统中的应用

本文针对嵌入式Linux触摸屏在漆包线检测系统中的应用,介绍了本系统中触摸屏的具体接口电路,嵌入式Lin-ux下驱动程序的实现,及与应用程序的接口.与传统的键盘输入方式相比,触摸屏输入方式简单、便捷、灵活.     

基于Windows CE的触摸屏驱动分析与实现

触摸屏是嵌入式系统中常用的输入设备。本文介绍了Windows CE操作系统中触摸屏驱动程序的模型和工作流程,并给出了AKM4182触摸屏控制芯片在Xscale PXA270平台上的驱动程序。     

基于BU21023的电阻式触摸屏两点触控功能设计

随着触摸屏的普及,两点／多点触控功能成为人们新的关注点。本文介绍了电阻式触摸屏两点触摸控制芯片BU21023的功能与应用,并基于嵌入式Linux系统实现了电阻式触摸屏的两点触控功能。该方案可以用于普通四线电阻式触摸屏上,而且能够有效地降低实现两点触控功能所需的硬件成本。     

Bending stress analysis of flexible touch panel

Flexible touch panel is required to undertake extensive bending operations during service; thus, bending testing of flexible touch panel for mechanical behaviors and even reliability is crucial for realizing the technology. This study aims at exploring the bending behaviors of a flexible touch panel under a four-point bending test using finite element analysis. The touch panel is a laminated structure composed of seven thin film layers, namely a polyester layer, an adhesive layer, a polyimide layer, two organic layers and two indium tin oxide conductive layers. Because the touch panel structure is symmetry, only a quarter of the flexible touch panel is established in the analysis model. The mechanical properties of the materials are first obtained using both nanoindentation and uniaxial tensile/compressive testing. Furthermore, a modeling technique based on global and local finite element analysis is applied to evaluate the bending stress at a specified radius of curvature. Special emphasis of the calculation is put on the critical region with respect to stress, which is identified as the most susceptible cracking site.     

Modeling and analysis of touch on flexible ultra-thin touch sensor panels for AMOLED displays employing finite element methods

The work employs the finite element method (FEM) to model the touch on the flexible ultra-thin touch sensor panel for analyzing touch characteristics and signals. Touch sensor panel readout circuits typically depend on touch signals to determine whether the touch sensor panel is touched or not. However, the ultra-thin touch sensor panel encountered a problem which cannot correctly recognize touch points on this type of touch sensor panel (TSP) on active-matrix organic light emitting diodes (AMOLED) displays since its electrical characteristics are different from the one of the conventional TSP. The modeling techniques for the flexible ultra-thin touch sensor panel on an AMOLED display is used to analyze touch signals from the influence of the thickness of top over layer of the flexible ultra-thin TSP and to observe the variations of mutual capacitance from touch on the flexible ultra-thin TSP. When the flexible ultra-thin touch sensor panel with the thickness of the top over layer less than the threshold thickness of the top over layer is on multi-touch, the phenomenon of the ghost points are generated. The simulation to find the threshold thickness of the top over layer based on the FEM model is conducted, and the simulation results show the top layer thickness should be larger than 107 µm to eliminate the ghost points. Furthermore, a new solution that is an optimization of the electrode pattern of transmitters and receivers in the ultra-thin touch sensor panel to further minimize the threshold thickness of the top over layer of TSP without changing the physical structure of TSP is proposed. The results conducted by using this proposed solution show that TSP top over layer threshold thickness can be reduced to 65 µm without appearance of the ghost points.

     

嵌入式操作系统Windows CE下触摸屏驱动的开发

触摸屏作为终端与用户交互的媒介已经逐渐取代键盘成为嵌入式计算机系统的输入设备，而触摸屏的应用是建立其驱动程序之上，所以研究触摸屏驱动程序的开发就有了重要的意义。本文针对S3C2440的触摸屏模块完成了其Windows CE下驱动程序的开发，在Platform Builder 4．2下进行驱动代码的编写、编译，并通过软硬件交叉环境进行调试，最终完成了触摸屏驱动程序的开发。     

基于Windows CE的触摸屏驱动分析与实现

随着嵌入式电子产品的迅猛发展,触摸屏由于其便捷、灵活、占用空间少等优点,已经逐渐取代键盘成为嵌入式计算机系统常选用的人机交互输入设备。WindowsCE是微软公司推出的嵌入式实时操作系统,是一个紧凑、高效、可扩展的操作系统,适用于各种嵌入产品。介绍了WindowsCE操作系统中触摸屏驱动程序的模型和工作流程,并给出了AKM4182触摸屏控制芯片在XscalePXA270平台上的驱动程序实现。     

一种电感式触摸屏控制器设计

在介绍电感式触摸屏的结构及工作原理的基础之上,设计了以HT460RB70单片机为控制核心的电感式触摸屏控制器,该控制器采用CD4051电子开关电路作为触摸屏驱动。电感式控制器触摸检测装置采用后置的方式,避免了触摸过程中的机械损伤,延长了触摸屏的寿命,同时具有低成本的优点。该控制器的硬件电路及软件部分已全部实现,实验结果表明该控制器具有较好的稳定性,且适用温度范围广。     

The technologies of in‐cell optical touch panel with novel input functions

Abstract— The technologies behind an in‐cell optical touch‐panel LCD with novel input functions will be described. By improving both the optical and electrical signal‐to‐noise ratio (SNR), a touch‐panel operation robust to ambient conditions can be achieved with a low‐power consumption suitable for integration into mobile products. The high SNR also enables a range of novel input functions making the in‐cell optical touch panel a promising platform for the next‐generation of user interface.     

A foldable OLED display with an in‐cell touch sensor having embedded metal‐mesh electrodes

A foldable organic light‐emitting diode display integrating a touch sensor is fabricated. The touch sensor has an in‐cell structure where metal‐mesh sensor electrodes are formed in a counter substrate. It is demonstrated that touch on the entire panel surface, including a bent portion, is detected and that the touch panel operates correctly after 100,000 folding operations with a radius of curvature of 5 mm.     

Design and validation of the readout circuitry for an in-cell active-matrix capacitive (IAMC) touch panel

Microsystem Technologies - This study is dedicated to design an in-cell active-matrix capacitive (IAMC) touch panel and its readout circuitry. This IAMC touch panel is in a structure that embeds...