IC697PWR711 亿佳做口碑

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，有好的防刮性，能承受粗暴的触摸，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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