Light pen detection system for CRT image display

Details Light pen detection system for CRT image display Light pen detection system for CRT image display

1978-05-08

1980-02-26

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340747, 340799, G06F 314

Patent

active

041908317

ABSTRACT:
In addition to the binary code that controls the image, or portion thereof, that is to be graphically traced on the screen of a cathode ray tube, a refresh memory also provides an identification code indicative of the image, or portion thereof, within the refresh memory. While the image, or portion thereof is being traced on the screen of the cathode ray tube, the identification code from the refresh memory is stored in a register. A light pen output signal generated by sensing light from the trace on the screen of the cathode ray tube enables the identification code stored in the register to be transferred to a computer to provide the computer with an accurate input as to which image, or portion thereof, the operator identified with the light pen. Means are also provided to disable the light pen whenever the portion of the display being traced on the screen of the cathode ray tube is not intended to be accessible to the operator by means of the light pen.

REFERENCES:
patent: 3037192 (1962-05-01), Everett
patent: 3131154 (1965-04-01), Henne
patent: 3402395 (1968-09-01), Culler et al.
patent: 3413515 (1968-11-01), Haring
patent: 3543240 (1970-11-01), Miller et al.
patent: 3680078 (1972-07-01), Baskin
patent: 3774158 (1973-11-01), Clark
patent: 3944988 (1976-03-01), Mayer
patent: 3997891 (1976-12-01), Iwamura
patent: 4129858 (1978-12-01), Hara

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