6ES7431-1KF00-0AB0 库尔勒县

电阻式触摸屏不怕尘埃、水及污垢影响，能在恶劣环境下工作。但并且由于经常被触动，表层 ITO使用一段时间后会出现细小的裂纹，甚至变形，因此其寿命并不长久。门槛低，成本相对价廉，优点是不受灰尘、温度、湿度的影响。缺点也很明显，外层屏膜很容易刮花，不能使用尖锐的物体点触屏面。电阻式触摸屏利用压力感应进行控制，它的表层是一层塑胶，底层是一层玻璃，能承受恶劣环境因素的干扰，但手感和透光性较差，适合佩带手套和不能用手直接触摸的场合。

表面声波式触摸屏

表面声波是超声波的一种，它是在介质（例如玻璃）表面进行浅层传播的机械能量波。表面声波性能稳定、易于分析，并且在横波传递过程中具有非常尖锐的频率特性。表面声波触摸屏的触摸屏部分可以是一块平面、球面或柱面的玻璃平板, 安装在 CRT、LED、LCD或是等离子显示器屏幕的前面。这块玻璃平板只是一块纯粹的强化玻璃，没有任何贴膜和覆盖层。玻璃屏的左上角和右下角各固定了竖直和水平方向的超声波发射换能器, 右上角则固定了两个相应的超声波接收换能器，玻璃屏的四边刻有由疏到密间隔非常精密的 45 度角反射条纹。在没有触摸的时候，接收信号的波形与参照波形完全一样。当手指触摸屏幕时，手指吸收了一部分声波能量，控制器侦测到接收信号在某一时刻的衰减，由此可以计算出触摸点的位置。除了一般触摸屏都能响应的 x、y 坐标外,表面声波触摸屏的突出特点是它能感知第三轴（z 轴）坐标, 也就是能感知用户触摸压力的大小值,其原理是由接收信号衰减处的衰减量计算得到。三轴一旦确定,控制器就把它们传给主机。

表面声波式触摸屏特点

表面声波触摸屏不受温度、湿度等环境因素影响，分辨率高，具有防刮性，寿命长( 维护良好情况下达 5000 万次) ，透光率和清晰度高,没有色彩失真和漂移, 安装后无需再进行校准，有极好的防刮性，能承受各种粗暴的触摸，适合公共场所使用。 [但尘埃、水及污垢会严重影响其性能，需要经常维护，保持屏面的光洁。

电容式触摸屏

这种触摸屏是利用人体的电流感应进行工作的，在玻璃表面贴上一层透明的特殊金属导电物质，当有导电物体触碰时，就会改变触点的电容，从而可以探测出触摸的位置。但用戴手套的手或手持不导电的物体触摸时没有反应，这是因为增加了更为绝缘的介质。

电容触摸屏能很好地感应轻微及快速触摸、防刮擦、不怕尘埃、水及污垢影响，适合恶劣环境下使用。 [电容屏主要的缺点是漂移: 当环境温度、湿度改变, 环境电场发生改变时, 会引起电容式触摸屏的漂移, 造成不准确。

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发布时间：2024-06-19

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