Digital blanker for scanned displays
    1.
    发明授权
    Digital blanker for scanned displays 失效
    用于扫描显示器的数字消隐器

    公开(公告)号:US5068647A

    公开(公告)日:1991-11-26

    申请号:US331912

    申请日:1989-04-03

    IPC分类号: G09G1/08 G09G1/16

    CPC分类号: G09G1/16 G09G1/08

    摘要: A digital blanker for scanned displays is provided which turns off the electron beam on a Cathode Ray Tube whenever the beam is in a pre-defined area on the screen. A high speed analog to digital converter is utilized to digitize the position of either a raster or randomly scanned CRT beam. Once the beam position is digitized, the resulting number is used as an address to an EPROM. The data in the EPROM is coded to cause the CRT beam to be blanked if the beam is positioned in the predefined area where blanking is required.

    摘要翻译: 提供用于扫描显示器的数字消隐器,每当光束在屏幕上的预定义区域中时,它将关闭阴极射线管上的电子束。 利用高速模数转换器对光栅或随机扫描的CRT光束的位置进行数字化。 一旦波束位置被数字化,结果的数字就被用作EPROM的地址。 EPROM中的数据被编码为使得如果光束被定位在需要消隐的预定区域中,则CRT光束被消隐。