Graphics light pen and method for raster scan CRT

Details Graphics light pen and method for raster scan CRT Graphics light pen and method for raster scan CRT

1980-04-04

1983-01-04

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340712, G09G 116

Patent

active

043674658

ABSTRACT:
A graphics system for a raster scan CRT implements a light pen tracked by a cursor. Hits corresponding to the cursor are distinguished from those corresponding to background data by a selective interlacing technique. A threshold level shifting technique providing accurate measurement of a horizontal component of the cursor allows accurate prediction of the location of the center of the field of view during the next frame.

REFERENCES:
patent: 3413515 (1968-11-01), Haring
patent: 3512037 (1970-05-01), Eckert et al.
patent: 3786479 (1974-01-01), Brown et al.
patent: 3793481 (1974-02-01), Ripley et al.
patent: 4093947 (1978-06-01), Habeger, Jr. et al.
patent: 4117471 (1978-09-01), Schlig

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