JD1G03-0-0 RadiSys

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JD1G03-0-0 RadiSys两种多点触摸技术

　　多点触摸顾名思义就是识别到两个或以上手指的触摸。多点触摸技术目前有两种：Multi-Touch Gesture和Multi-Touch All-Point。通俗地讲，就是多点触摸识别手势方向和多点触摸识别手指位置。

JD1G03-0-0 RadiSys识别手势方向

　　我们现在看到多的是Multi-Touch Gesture，即两个手指触摸时，可以识别到这两个手指的运动方向，但还不能判断出具体位置，可以进行缩放、平移、旋转等操作。这种多点触摸的实现方式比较简单，轴坐标方式即可实现。把ITO分为X、Y轴，可以感应到两个触摸操作，但是感应到触摸和探测到触摸的具体位置是两个概念。XY轴方式的触摸屏可以探测到第2个触摸，但是无法了解第二个触摸的确切位置。单一触摸在每个轴上产生一个单一的大值，从而断定触摸的位置，如果有第二个手指触摸屏面，在每个轴上就会有两个大值。这两个大值可以由两组不同的触摸来产生，于是系统就无法准确判断了。有的系统引入时序来进行判断，假设两个手指不是同时放上去的，但是，总有同时触碰的情况，这时，系统就无法猜测了。我们可以把并不是真正触摸的点叫做“鬼点”，如图1所示。

图1 鬼点（无法分辨红点还是蓝点为真正的触摸）

识别手指位置

　　Multi-Touch All-Point是近期比较流行的话题。其可以识别到触摸点的具体位置，即没有“鬼点”的现象。多点触摸识别位置可以应用于任何触摸手势的检测，可以检测到双手十个手指的同时触摸，也允许其他非手指触摸形式，比如手掌、脸、拳头等，甚至戴手套也可以，它是人性化的人机接口方式，很适合多手同时操作的应用，比如游戏控制。Multi-Touch All-Point的扫描方式是每行和每列交叉点都需单独扫描检测，扫描次数是行数和列数的乘积。例如，一个10根行线、15根列线所构成的触摸屏，使用Multi-Touch Gesture的轴坐标方式，需要扫描的次数为25次，而多点触摸识别位置方式则需要150次。

　　Multi-Touch All-Point基于互电容的检测方式，而不是自电容，自电容检测的是每个感应单元的电容（也就是寄生电容Cp）的变化，有手指存在时寄生电容会增加，从而判断有触摸存在，而互电容是检测行列交叉处的互电容（也就是耦合电容Cm）的变化，如图2所示，当行列交叉通过时，行列之间会产生互电容（包括：行列感应单元之间的边缘电容，行列交叉重叠处产生的耦合电容），有手指存在时互电容会减小，就可以判断触摸存在，并且准确判断每一个触摸点位置。

图2 互电容检测方式

     用诚信的心，真诚的为您服务！！

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