Refreshing of dynamic memory

Claim 1

In a video system wherein a field of image data that is to be displayed is stored in a refreshable memory, the method of refreshing the memory during the field that includes the steps of supplying a row address signal from a row address counter to the memory to select a row of memory for display at the beginning of a field, latching the selected row of memory whereby the row is refreshed, supplying a train of cloumn address signals from a column address counter to the memory to sequentially address each memory cell in the selected row whereby the data stored in the selected row is transferred to a video display means to provide a line video data, incrementing the row address counter a number of times during the video horizontal retrace period and supplying said address signals to the memory to sequentially refresh a given number of rows, incrementing the row address counter once again to address the next row to be displayed, and repeating the above noted steps until such time as the entire field of data stored in the memory is displayed.