Control device for video display module

Details Control device for video display module Control device for video display module

1977-02-07

1979-02-20

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

364900, G06K 1520

Patent

active

041410033

ABSTRACT:
A control device for a video display module includes means for scrolling the displayed alpha-numeric data either up or down, means for displaying the top line of the displayed data from the top of the video screen, and means for selecting the starting point within a memory system at which the display of alpha-numeric data commences. The device includes an address register and a displacement register which store the memory address at which display commences, and the displacement of the beginning of the display from the top of the screen, respectively. Each register feeds a respective displacement counter and an address counter. Loading of the displacement counter is actuated by the vertical retrace signal, while loading of the address counter is actuated at the time when the displacement counter reaches zero. The address counter is incremented by the text line advance signal of the display circuitry, and the address counter output is connected to the internal memory line address input. The video display is inhibited by a signal from a latch which is set by the vertical retrace signal and reset when the displacement counter reaches zero.

REFERENCES:
patent: 3505650 (1970-04-01), Brown
patent: 3676850 (1972-07-01), Goldman et al.
patent: 3821731 (1974-06-01), Levine
patent: 3913089 (1975-10-01), Albrecht
patent: 4045789 (1977-08-01), Bristow
patent: 4068225 (1978-01-01), Lee

Affiliated with

Also associated with

Rating

Control device for video display module does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control device for video display module, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control device for video display module will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-260523