Laser touch panel reflective surface aberration cancelling
    1.
    发明授权
    Laser touch panel reflective surface aberration cancelling 失效
    激光触摸面板反射表面像差消除

    公开(公告)号:US5196835A

    公开(公告)日:1993-03-23

    申请号:US697493

    申请日:1991-05-02

    IPC分类号: G06F3/033 G06F3/041 G06F3/042

    CPC分类号: G06F3/0418 G06F3/0423

    摘要: A method and apparatus that distinguish a valid touch from an optical aberration caused by unwanted objects and/or scratches in the light plane of an optical touch panel device is disclosed. During a training mode the device learns the relative position of "aberration dropouts" caused by the unwanted objects. During normal operating mode the relative positions of "touch and aberration dropouts" are generated and compared with the relative position of aberration dropouts to distinguish between aberration dropout signals and touch dropout signals. The touch dropout signals are subjected to further processing to determine the precise location of a touch while the aberration dropout signals are discarded.

    摘要翻译: 公开了一种将有效触摸与由光学触摸面板装置的光平面中的不期望的物体和/或划痕引起的光学像差区分开的方法和装置。 在训练模式下,设备会学习由不需要的物体引起的“像差辍学”的相对位置。 在正常工作模式下,产生“触摸和像差辍学”的相对位置,并与像差压差的相对位置进行比较,以区分像差压差信号和触摸压差信号。 在丢弃像差压差信号的同时,触摸偏移信号经受进一步处理以确定触摸的精确位置。