Abstract:
A color cathode ray tube (CRT) arrangement utilizing only a single electron gun. A single electron beam, emitted from the single gun, is deflected in such a manner as to simulate the three electron beams that would normally be provided by three separate electron guns in a conventional CRT arrangement. The single electron beam is electrostatically deflected by electrodes according to a three stage cycle to simulate three electron beams directed in different directions. The simulated electron beams are deflected by a supplemental coil to correct for convergence error. The three electron beams are deflected by the main deflection coils of the tube's yoke and then pass through apertures of the tube's shadow mask to impinge on phosphor stripes of a screen formed on a face plate of the tube.
Abstract:
The novel CRT includes a color-selection structure which comprises a first electrode having a plurality of column and row elements forming a plurality of apertures, and a second electrode including an array of conductors electrically insulated from the first electrode. The plurality of apertures in the first electrode comprise alternate columns of first and second apertures. The first apertures have a width less than the width of the second apertures which are intersected by the conductors of the second electrodes to form first and second windows. The CRT also includes a viewing screen comprising an array of substantially parallel phosphor stripes of three different emission colors arranged in cyclic order in adjacent triads. Each of the triads of phosphor stripes is associated with a column of first and second windows and a column of first apertures. The column of first apertures is aligned with one of the phosphor stripes of the triad and is flanked on one side by a column of first windows and on the other side by a column of second windows. A method of producing an image screen using the novel color-selection structure is also disclosed. The method comprises the steps of: (a) providing the conductors of the second electrode of the color-selection structure with an opaque light blocking structure to temporarily close the first and second windows, (b) projecting light through the first apertures of the first electrode whereby to photodeposit the screen, and (c) then removing the opaque light blocking structure from the conductors of the second electrode to open the first and second windows.
Abstract:
A shadow-mask cathode ray tube for the visualization of colors, such as in television, where the peripheral edge of the mask is rigid with the frame fixed on the tube plate and is in contact with said frame only in areas spaced from each other. The frame is formed with bosses providing its contact in reduced cross-section areas spaced from each other with the edge of the mask.
Abstract:
In a color picture tube having an electron gun within the neck portion of its envelope for directing and focusing a plurality of electron beams at a color phosphor screen on a face plate of the conical envelope portion, a first high voltage for operation of the gun is supplied to the latter through a conductive layer on the inner surface of the conical envelope portion, and a second high voltage required for operation of the gun is supplied to the latter by way of a lead wire extending within the conical envelope portion through a conductive tubular member which is electrically connected with the conductive layer and insulated from the lead wire. The conductive tubular member is electrically connected with the conductive layer by an arcuate spring member which further serves to accurately and securely position the tubular member and the lead wire therein within the tube envelope, thereby ensuring proper engagement with the gun of a contact member that extends from the lead wire.
Abstract:
A display device utilizing an array of electron-emitting sources insulatively supported opposite a screen member so that each emitting source is in register with a selected area element of such screen member. Means are provided for sequentially controlling the emission of electrons from such sources so that the emitted electrons impinge in an appropriate sequence upon the selected area elements of the screen member to produce an image thereon. An appropriate stereoscopic display of such image may be provided by using optical filters adjacent each selected area element so that certain selected portions of the visible spectrum are transmitted to the receiver from each such element as a result of the impingement of electrons thereon.