A display system includes an image generator that generates an image and a control circuit that reduces or eliminates the viewer's perception of a visual artifact when the viewer's gaze shifts with respect to the image. For example, such a display system may generate a fill-in light to reduce or eliminate the viewer's perception of flicker or other visual artifacts when the viewer shifts his gaze with respect to an exit pupil through which the generated image is viewed. The system may match the fill-in light's brightness, color, or both the brightness and color to the brightness and/or color of the image.