Position reader
    1.
    发明授权
    Position reader 失效
    位置阅读器

    公开(公告)号:US5945973A

    公开(公告)日:1999-08-31

    申请号:US643458

    申请日:1996-05-08

    CPC分类号: G06F3/0412 G06F3/044

    摘要: A position reader having a display device and a tablet, and being provided with means for detecting an end of display period of the display screen to set a position read period for reading the position of a pen-down point on the tablet, means for masking (i.e., fixing) display drive signals of the display device, and means for directing the CPU to read a coordinate position of the pen-down point on the tablet; the pen-down point read period being provided outside the display period of the display screen. Noise caused by changes in levels of display drive signals can be prevented from occurring in the tablet, and therefore the coordinate of the pen-down point of a pen-down means on the tablet can be read with a good precision.

    摘要翻译: 一种具有显示装置和平板电脑的位置读取器,并且具有用于检测显示屏幕的显示周期结束以设置用于读取平板电脑上的笔尖位置的位置读取周期的装置,用于屏蔽的装置 (即,固定)显示装置的驱动信号,以及用于引导CPU读取平板电脑上的笔尖的坐标位置的装置; 在显示屏幕的显示周期之外设置笔尖读取期间。 可以防止在平板电脑中发生由显示驱动信号的电平变化引起的噪声,因此能够以良好的精度读取平板电脑上的笔下装置的笔直点的坐标。