Abstract: A light emitting device includes an enclosure with a face portion, a cold cathode within the enclosure, a phosphor layer disposed on an interior surface of the face portion, and a tubulator between the cold cathode and the phosphor layer, the tubulator having a conductive insert. Electrons from the cold cathode are defocused by the conductive insert and impact the phosphor layer when an electric field is created between the cold cathode and the phosphor layer due to applied voltages at the cold cathode, conductive insert and phosphor layer. The phosphor layer emits light through the face portion in response to electrons incident thereon.

Abstract: The present invention teaches a matrix addressed flat panel display device. A substrate is contained within a vacuum envelope with a translucent pane to allow viewing of the image. The substrate panel has one side covered with phosphor-coated anode pads, and the other side with driver circuitry for selectively activating individual conductive anode pads by electric connections using vias or similar electric connections through the substrate. An electron source such as thermionic filaments are disposed between the phosphor-coated anode pads and the translucent pane.

Abstract: A Flat Panel Display apparatus has a spacing component composed of a ceramic material which creates an accurately controllable and variable compressive strain on prescribed critical areas of the inner surface of the display panel and backplane which strengthens the assembly and permits the use of thiner and lighter materials.

Abstract: A flat-panel, matrix-type visible light emissive display which has an electron source positioned at the back panel for providing a background of electrons. An electron gating grid having a number of conductive filaments is positioned before the front panel and exposed to the electron source. A display array with a number of parallel conductive phosphor stripes for generating visible radiation when bombarded with electrons is arranged between the electron gating grid and the front panel. The display has a control unit for applying an accelerating voltage V.sub.3 to the conductive phosphor stripes, and an arrangement for selectively applying a blocking voltage V.sub.2 and a gating voltage V.sub.1 to the conductive filaments, such that gating voltage V.sub.

Abstract: A deflecting apparatus for a flat-panel display having an evacuated display housing and a display screen. The display has phosphor stripes or dots for generating visible radiation when bombarded with electrons when accelerating voltage V.sub.1 is applied to stripes. The invention provides for an elongate electron source positioned in the back of the evacuated display housing for emitting electrons which are guided to the display screen through an anode grid or an electron gating grid located before the display screen. The deflecting apparatus for rendering the beam of electrons emitted from the elongate electron source uniform has a deflecting element or unit which is positioned at the back of the display housing and produces a spatially parabolic potential under the influence of steering potential V.sub.4. This spatially parabolic potential forces the electrons moving in the direction of the anode grid or gating grid to form a uniform beam.

Abstract: A control device may be connected in series or in parallel to a telephone for restricting or routing calls made from the telephone to take advantage of low cost carriers for intra-LATA calls. The serial or parallel connection of the telephone can be detected as well. The device may be programmed for routing depending on the geographical location of the telephone. The central receiving office of the local phone company can be prevented from routing the call by the use of interfering tones.