Raster display position detection

摘要

In order to accurately detect and commmunicate the position of a data location in a raster type luminescent display utilizing light-sensitive detection means, the permitted response time for the light detection means is extended by allowing detection of only a portion of the data locations during each scan of raster display means. Maintenance of a predetermined relationship between the number of raster scans in a detection cycle and the particular data locations for which detection is possible on each scan permits exact definition of a target data location. Detection is aided by the superimpositon of a luminescent cursor associated with each data location for which detection is permitted as the raster display is scanned.