Split screen smooth scrolling arrangement

Details Split screen smooth scrolling arrangement Split screen smooth scrolling arrangement

1983-10-18

1986-09-09

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

G09G 106

Patent

active

046112022

ABSTRACT:
The present invention is employed in a system which has a bit map memory connected to a CRT display device and the CRT display device can display a fixed region of information and a scrollable region of information. In a preferred embodiment, the system uses a graphic display control circuit to change starting addresses and length ending values of the fixed and scrollable regions in the bit map memory. By changing the starting address one scan line per frame, without any actual transfer of data in memory, from one location to another location, the present system effects a "smooth" scroll. The system is able to scroll upward and downward. The system uses logic circuitry to load an off screen segment of the bit map memory with additional scrollable information, so that (in an upward scroll load) as a top line of the scrollable information region is no longer displayed, new information will be displayed at the bottom line of said scrollable region. On the other hand during a downward scroll, a bottom line of information on the scrollable region of the screen will fade out and new information is added, from the off screen region, of the bit map memory to provide information for a new top line. In addition the system has the ability to reorganize the information in the bit map memory in the event the size or location of the fixed region is to be altered.

REFERENCES:
patent: 4068225 (1978-01-01), Lee
patent: 4437093 (1984-03-01), Bradley
patent: 4511962 (1985-04-01), Machida et al.

Affiliated with

Also associated with

Rating

Split screen smooth scrolling arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Split screen smooth scrolling arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Split screen smooth scrolling arrangement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1017412