Abstract: A brightness control circuit for use with Plasma and Electroluminescent displays. The circuit receives from a computer, or other driving device, video data to be displayed, an intensity signal indicating the intensity with which to display data, a video clock and horizontal and vertical sync signals. The circuit generates first and second video fields, each having some data removed from the fields defined by the input video signal. These fields are combined to form frame data which is then modulated by the intensity signal. The result is modified video data for coupling to the display which can cause the display to display data at a low intensity.