电容触摸屏测试中的激励信号发生器的硬件电路设计

更新时间：2020-09-14 10:20:59 大小：506K 上传用户：xiaohei1810 查看TA发布的资源 标签：电容触摸屏信号发生器 下载积分：1分评价赚积分（如何评价?）收藏评论(0) 举报

资料介绍

电容式触摸屏由于它具有响应时间短和透过率高等特点,近年来已成为一种主流的触摸屏,在智能终端和手机等产品中得到了广泛应用。首先给出了对电容触摸屏进行测试的硬件电路结构,它主要包含激励信号模块、控制模块、检测模块、探针模块、存储电路、LCD显示、键盘输入模块、接口模块等多个模块;其次,给出了激励信号模块的实现方法,采用DDS芯片AD9954来产生多种频率的信号波形。实验结果表明所给出的硬件电路结构可以产生所需要的多种类型的信号波形。因此,通过采用FPGA和DDS芯片来对激励信号发生器的硬件电路进行设计,能够较好地满足实际的对电容触摸屏测试的要求。

Due to its short response time and high transmission rate,capacitive touch screen has been widely used in the smart terminal and mobile phone. Firstly,the hardware circuit structure is given for the test of capacitive touch screen,it mainly includes the excitation signal module,control module,detection module,probe module,storage circuit,LCD display,keyboard input module and interface module. Secondly,the realization method of excitation signals module is given,which uses DDS chip AD9954 to generate signal waveforms with multiple frequency. The experimental results show that the hardware circuit structure can generate multiple types of signal waveforms. Therefore,it ...