Abstract: An evacuated envelope includes a transparent front panel having a cathodoluminescent screen thereupon and a back panel interconnectably sealed to the front panel. The back has a plurality of cathode stripes thereon. A plurality of vanes, spaced from and parallel to each other, extend between the front and back panels orthogonal to the cathode stripes. Electrodes to control the operation of the device are formed directly on the vanes. Any two adjacent vanes form an electron multiplier in which a self sustaining source of electrons is created only at a location along the vanes which is determined by the proper energizing of the cathode stripe at that location.

Abstract: A flat panel display device has a cathodoluminescent screen which is bombarded by a flow of electrons. The screen becomes electrically charged due to the electron bombardment. The charge striking various points on the screen is directly related to the image brightness at those points. The flow of electrons to each point is modulated by sensing the electrical charge which strikes the screen's surface at each point and comparing it to the image brightness signal for the display. When a predetermined relationship between the charge and the signal exists, indicating that the proper brightness level has been reached, the electron flow is terminated. The sensing system may be multiplexed to reduce its complexity.

Abstract: The structure comprises an evacuated envelope that includes a transparent front panel having a cathodoluminescent screen thereon and a back panel interconnectably sealed to the front panel. A plurality of first vanes, spaced from and parallel to each other, are perpendicular to and in contact with the back panel and a plurality of second vanes, spaced from and parallel to each other, are perpendicular to and in contact with the front panel. The first and second vanes are transverse to each other and provide mutual support for each other. Electroding to control operation of the device is formed directly on the vanes.