Method and apparatus for verification of displayed characters

Details Method and apparatus for verification of displayed characters Method and apparatus for verification of displayed characters

1978-01-09

1980-09-23

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340709, 340723, 340748, 340803, G06F 314

Patent

active

042246148

ABSTRACT:
A light pen detection system used in a data display system utilizes a cathode ray tube (CRT) in which characters displayed on the screen of the cathode ray tube are detected by the light pen, the detection of the character by the light pen resulting in the background inversion of the character sensed thereby providing a visual indication to the operator the character sensed by the light pen. A locking circuit is provided which, upon the sensing of a displayed character by the light pen, conditions the sensing circuits connected to the light pen to continually output the character sensed until the light pen is moved completely away from the locked character.

REFERENCES:
patent: T915013 (1973-10-01), Jones et al.
patent: 3509350 (1970-04-01), Gundrum
patent: 3569617 (1971-03-01), Allen et al.
patent: 3768073 (1973-10-01), Rawson et al.
patent: 3868673 (1975-02-01), Mau, Jr. et al.
patent: 3911419 (1975-10-01), Bates et al.
patent: 4022969 (1977-05-01), McKinlay et al.

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