Vertical blanking interval
DURATION BETWEEN THE WRITING OF THE FINAL ROW OF ONE FRAME IN A TELEVISION SIGNAL AND THE WRITING OF THE INITAL ROW IN THE NEXT FRAME, DURING WHICH THE DISPLAY IS ALLOWED TO RESET AND THE DISPLAY HEAD TO RETURN TO THE FRAME START POSITION
Vertical interval; Vertical blank; Vertical Blanking Interval; VBlank; Vertical retrace; Vblank; Vertical blanking; Vertical retrace interval
In a raster scan display, the vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time between the end of the final visible line of a frame or field and the beginning of the first visible line of the next frame. It is present in analog television, VGA, DVI and other signals.