Abstract:
A multipersistence display device is described which comprises a cathode-ray tube whose faceplate is coated with a layer of an ultraviolet-emitting phosphor. Provided on the ultraviolet phosphor layer is a layer of a phosphor-emitting visible light. The electron beam accelerating voltage of the cathode-ray tube is selectively controlled; a lower voltage causing the electron beam to excite the visible phosphor layer, and higher voltage causing the electron beam to excite the ultraviolet phosphor layer. An image-storage panel is included for storing the ultraviolet image which is produced when the ultraviolet phosphor layer is excited. An optical image system is provided for projecting images appearing on the screen of the cathode-ray tube onto the imagestorage panel. Thus, when the cathode-ray tube is operated at the lower voltage to excite the visible phosphor, dynamic information can be displayed on the image-storage panel and, when the cathode-ray tube is operated at the higher voltage to excite the ultraviolet phosphor, static information can be stored in the image-storage panel and displayed by the action of an electroluminescent material thereby.
Abstract:
A DISPLAY SYSTEM INCLUDING A GAS DISCHARGE DISPLAY PANEL MADE UP OF AN ASSEMBLY OF GLASS FILMS ENCLOSING A GAS AND INCLUDING ELECTRODES THAT DEFINE AN ARRAY OF DISCRETE CELLS. A SOURCE OF SUSTAINING VOLTAGE IS APPLIED TO THE ELECTRODES TO MAINTAIN THE GAS SLIGHTLY BELOW A THRESHOLD VALUE. A HAND STYLUS WHICH PRODUCES A HIGH VOLTAGE DISCHARGE IS CONNECTED TO THE SOURCE OF SUSTAIN-
ING VOLTAGE AND IS EMPLOYED TO SELECTIVELY EXCITE THE CELLS WHICH THEN EMIT VISIBLE LIGHT SELECTIVELY EXTINGUISHED.
Abstract:
An improved halftone charge-controlled viewing storage tube which uses the field-effect principle is described. The tube is characterized as having as its face plate a panel comprising a light transparent support plate, a light transparent conductive coating on one side of such support plate a first electroluminescent material layer disposed over the conductive coating and a layer of a uniform mixture of a second electroluminescent material and a photoconductor is disposed over the first electroluminescent layer. The first electroluminescent material is selected to emit light in the visible range of the electromagnetic spectrum, while the second electroluminescent material is sealed to emit light in the near ultraviolet region of the electromagnetic spectrum. Large panels 12 X 12 inches and larger can be used to give sharp clear images. Additionally, high writing speed is obtained in the storage tube. Information can be stored or can be disposed without being stored. Also, the storage tube is capable of providing long viewing times.