Abstract: A multi-layer electroluminescent element so constructed that the overlapping area between a second voltage applying electrode and a transparent conductive layer is larger than the overlapping area between a first voltage applying electrode and the transparent conductive layer, a further decrease of the driving voltage is possible.

Abstract: A gas discharge display device comprising alternately disposed anodes and cathodes, wherein the anodes and the cathodes are interconnected respectively in multi-phase connections whereby a bar-graph display can be effected by means of a self-scanning function.

Abstract: The display panel comprises a gas-filled envelope which contains a series of aligned cathode electrodes, an anode for the series, and a reset cathode at each end of the series of cathodes. The system includes a driving circuit which repeatedly scans along the series of aligned cathode electrodes by sequentially grounding the aligned electrodes and repeating the process cyclically. Within each cycle, a pulse width modulator energizes the anode, which is opposite the cathode electrodes, for a period of time corresponding to an input value. Sequential glow discharges thus occur between the cathodes and the anode over a portion of the anode length. The discharges occur with sufficient rapidity so that they are observed as an illuminated portion of a bar formed by the electrodes. The panel is particularly suited for producing two illuminated bands or bars separated from each other. Desired upper and lower set point limits for the input quantity determine the lengths of the bands and the separation between them.

Abstract: A phosphorus luminescent display tube of the triode type having, in a vacuum casing, a filamentary cathode for emitting thermions, a control electrode for accelerating and controlling the thermions emitted from the cathode, a plurality of pattern display sections each composed of a plurality of segment anodes each coated with a phosphor layer for emitting light when the thermions impinge thereon, the segment anodes being selectively given an anode potential, and auxiliary anode conductors provided in the vicinity of and substantially on the same level with the segment anodes and kept positive with respect to the filamentary cathode so as to absorb electron oscillations occurring in the vicinity of the segment anodes to which the anode potential is not given.

Abstract: The disclosure utilizes a memory electroluminescent (EL) layer which has brightness-voltage (B-V) characteristics with multistable hysteresis loops of one color emission. Another EL layer of second color emission is incorporated therewith for a multicolor display device. The device comprises the two EL layers fabricated in sandwich form separated from each and from the electrodes by insulating layers which are inserted for breakdown protection and isolation of the two EL layers. Certain insulating layers may be omitted if the two EL layers are made of compatible materials and the hysteresis characteristics are not effected. In steady operation, an AC voltage signal is applied to the sandwiched device to maintain a display characteristic. A superposed switching voltage or electron beam or light beam is used to trigger a desired display. The displayed image may be erased by reducing sustaining AC voltage below threshold value.

Abstract: A display comprises a plurality of addressable display panels each having a display zone for displaying visual information and arranged in a formation so as to collectively provide a composite display of increased area. A fibre optic image transform construction is arranged in front of the display panels for transforming an image collectively provided by the panels into a corresponding continuous image in which discontinuity between adjacent panel display zones is eliminated.

Abstract: A vacuum fluorescent display is disclosed having a grid plate substantially coplanar with the anode and which is controllable with conventional metal oxide semiconductor devices. Each digit of the display includes a segmented anode structure substantially surrounded by a control electrode or grid plate. At least one cathode is disposed adjacent the anode segments and control electrode such that the distance between the cathode and the control electrode is less than the distance between the cathode and any of the anode segments. Utilizing such a structure, a voltage on the order of about -5 volts on the control electrode is effective to cut off luminescence from any of the anode segments of that digit.

Abstract: Disclosed is a driving method for a thin-film electroluminescent element of a three-layer construction which emits light and exhibits the hysteresis phenomenon within the light emission versus applied voltage characteristics. The light intensity is maintained and memorized at a predetermined value in the element by the application of a train of sustaining pulses of alternating voltage, the amplitude thereof being chosen at the voltage level appearing at the point in the hysteresis loop characteristics where the difference between the maximum light brightness on the voltage decreasing curve and the minimum light brightness on the voltage increasing curve is considerably large. The sustaining light brightness is controlled by varying the amplitude or the pulse width of the sustaining pulses. The information may be written, memorized and eliminated in the EL element as variations of the light brightness.