Memory control unit in a display apparatus having a buffer memor

Details Memory control unit in a display apparatus having a buffer memor Memory control unit in a display apparatus having a buffer memor

1981-02-06

1983-08-16

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340802, 340801, G09G 116

Patent

active

043994350

ABSTRACT:
A digital data display apparatus in which digital data to be displayed are stored in a refresh memory and displayed on a CRT display screen while scanning with rasters. The apparatus comprises a first buffer memory and a second buffer memory so that data read out from the refresh memory can be stored in the mode classified by an odd row and an even row respectively. When the display data stored in the first or second buffer memory are being displayed in an odd or even row on the display screen, the horizontal flyback period of that row is utilized so as to read out display data for the other row from the refresh memory, and store the same in the second or first buffer memory. In this manner, display data are alternately stored in and read out from the first and second buffer memories so that all the data can be displayed over the entire area of the display screen.

REFERENCES:
patent: 3345458 (1967-10-01), Cole et al.
patent: 3426344 (1969-02-01), Clark
patent: 3849773 (1974-11-01), Katahira et al.

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