In a
raster graphics display, the
vertical blanking interval (
VBI), also known as the
vertical interval or
VBLANK, is the time between the end of the final line of a frame or field and the beginning of the first line of the next frame. It is present in analog television,
VGA,
DVI and other signals. During the VBI the incoming data stream is not displayed on the screen. In raster
cathode ray tube displays, the beam is
blanked to avoid displaying the retrace line; see
raster scan for details. The signal source, such as a
television broadcast, does not supply image information during the blanking period.