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    • 8. 发明申请
    • DIGITAL CONTROLLER FOR A TRUE MULTI-POINT SURFACE USEABLE IN A COMPUTER SYSTEM
    • 用于计算机系统中可用的真正多点表面的数字控制器
    • WO2008086315A2
    • 2008-07-17
    • PCT/US2008/050442
    • 2008-01-07
    • APPLE INC.KRAH, Christoph, H.
    • KRAH, Christoph, H.
    • G06F3/041G06F3/044
    • G06F3/044G06F3/0416
    • An embodiment of an improved touch surface controller for controlling a multi-point touch surface such as a touch screen or a touch pad in a computer system is disclosed. The improved touch system controller detects signal capacitance from the pixels in the touch surface digitally, and therefore is easier and simpler to implement then previous approaches relying on analog detection and processing. Specifically, signal capacitance is measured by measuring a number of clock cycles taken to discharge or charge the input node of a comparator. Embodiments of the disclosed touch surface controller are particularly useful in the context of detecting multiple simultaneous touches on the touch surface.
    • 公开了一种用于在计算机系统中控制诸如触摸屏或触摸板的多点触摸表面的改进的触摸表面控制器的实施例。 改进的触摸系统控制器以数字方式从触摸表面中的像素检测信号电容,因此更容易和更简单地实现依赖于模拟检测和处理的先前方法。 具体地说,通过测量对比较器的输入节点进行放电或充电所花费的时钟周期数来测量信号电容。 所公开的触摸表面控制器的实施例在检测触摸表面上的多个同时触摸的上下文中是特别有用的。