In a display device for a camera of the type having adjustable display brightness, photographic information to be displayed is repeatedly converted by an A-D operation which is performed by an A-D conversion circuit; the digitally converted information is displayed by a display device. Information concerning display brightness modulation required for the display is arranged to be converted by A-D operation by the A-D converter every time the photographic information to be displayed is converted by A-D operation a predetermined number of times. The display brightness is adjusted on the basis of the A-D converted value of the display brightness information.