Rca Inc.

Carmen A Catanese

John Guiry Endriz

Stanley Bloom

Scott Allen Keneman

Eric F Hockings

Jan Aleksander Rajchman

Louis S Cosentino

David A De Wolf

Norman Lee Lindburg

Joshua Shefer

James Berkeley Harrison, Jr

An electron gun for use in a cathode ray tube includes beam forming electrodes and beam focusing electrodes. A gun improvement comprises the beam forming electrodes including a cathode, a control grid adjacent to the cathode and two screen grids. A first screen grid is located adjacent to the control grid. A second screen grid is located between the first screen grid and the beam focusing electrodes. Preferably, the second screen grid and the control grid are grounded.

Electron gun with improved beam forming region

CRT comprises a color-selection structure for producing a plurality of quadrupolar lenses, each lens defining a window for passing and focusing portions of electron beams to an associated color group of a target. The color-selection structure comprises (i) a metal masking plate having therein an array of substantially rectangular windows, each window having associated therewith (ii) a pair of first conductors insulatingly spaced from one major surface of the plate and located adjacent opposite sides of the aperture and (iii) a pair of second conductors insulatingly spaced from the other major surface of the plate and located adjacent opposte sides of the window. The CRT includes means for applying a voltage to said plate, means for applying a voltage to said pairs of first conductors and means for applying a voltage to said pairs of second conductors.

Multicolor cathode-ray tube with quadrupolar focusing color-selection

CPT comprises a deflection-and-focus color-selection masking structure, a screen of parallel phosphor stripes, and means for producing three convergent in-line electron beams directed towards the target. When the CPT is operated, pairs of beamlets transmitted through windows in adjacent apertures in the masking structure are deflected towards one another to excite the same phosphor stripe and, also, are focused (compressed) in the narrow width direction of the phosphor stripes and defocused (stretched) in the length direction of the phosphor stripes.

Color television picture tube with color-selection structure and method

A CRT comprises a deflection-and-focus color-selection masking structure, a screen of parallel phosphor stripes, and means for producing three convergent in-line electron beams directed towards the target. The masking structure comprises a metal masking plate having two major surfaces and having therein an array of apertures arranged in columns that are substantially parallel to the phosphor stripes. Arrays of narrow conductors are insulatingly supported in opposed positions on each major surface of said plate. The conductors extend substantially parallel to the stripes and are located in every other space between the columns.

CRT With dipolar deflection and quadrupolar-focusing color-selection

In a display device having an evacuated envelope, an electron beam guide and an electron generating means for generating beams of electrons, a modulator structure on which is disposed a plurality of control electrodes may be formed by interconnecting selected ones of the control electrodes which operate at a common potential. This interconnected electrode structure decreases the number of control electrodes which extend from the evacuated envelope. The electron generating means is shielded from the interconnected electrode structure to prevent perturbation of the generated electron beams.

Isolation busbar for a flat panel display device

The electron multiplier device is operable in a substantial vacuum and comprises a cathode which emits electrons upon ion bombardment and an electron multiplier section adjacent the cathode for multiplying electrons emitted from the cathode. An output target surface is partially interposed in the path of the electrons near the output of the multiplier. A portion of the electrons released by the multiplier strike the output target surface causing ions to be emitted therefrom. The ions then feed back and bombard the cathode causing it to release more electrons, which in turn are multiplied thereby providing a buildup of electrons leaving the multiplier output. The output electrons may be controlled by an electron control section aligned with the multiplier near its output end.

Electron multiplier device with surface ion feedback

A cathode device which employs regenerative ion feedback for sustained electron emission includes an enclosure filled with inert gas. A cathode, an electron multiplier region, and an ion interaction region are disposed in consecutive order within the enclosure with the interaction region being positioned at the output of the electron multiplier region. Means are provided for controlling the magnitude of ion feedback to the cathode whereby the feedback loop gain of the device can be caused to be either greater than, or less than, unity. The cathode device is useful in a cathodoluminescent cell which further includes an electron accelerating region and a cathodoluminescent screen. A plurality of these cathodoluminescent cells can be arranged so as to constitute an image display device. Disclosed also is a method of operating the cathode device and image display device.

Image display device with ion feedback control and method of operating

An electron multiplier is formed between two spaced parallel substrates of electrically conductive material with a cathode at one end of the substrates. On opposed surfaces of the two substrates are dynodes, extraction electrodes, modulation electrodes, electrically conductive protrusions and deflection electrodes in that order going away from the cathode end. The dynodes form a conventional staggered dynode chain. The modulation electrode on one substrate is opposite a modulation electrode on the other substrate and both have a width equal to the distance between the substrates. The protrusions are similarly directly opposite one another. At the end of the substrates remote from the cathode is a deflection electrode on the tip of each substrate.

Electron multiplier output electron optics

An electron multiplier includes a plurality of staggered parallel dynodes disposed between two insulating vanes. The dynodes are disposed between a cathode at one end and a high energy electron filter at the other end. The electron filter includes at least two staggered filter bodies which extend into the space between the vanes. Each of the filter bodies extends slightly more than one-half the distance between the vanes so as to provide no straight path therethrough for high energy electrons, i.e., the filter is optically opaque. Between the dynodes closest to the cathode and the electron filter is a transition region. The transition region includes transition dynodes, having unequal widths and unequal spacings, and steering electrodes. In multiplier operation, the transition region functions to steer low energy electrons around the electron filter.

Electron multiplier with high energy electron filter

An electron multiplier includes a plurality of staggered parallel dynodes. The dynodes include spaced confinement bumps along their lengths with active multiplying areas between the bumps. The confinement bumps and active areas therebetween define a plurality of channels which extend from a cathode at one end of the multiplier to the output end. Each channel traverses the staggered parallel dynodes and causes an electron beam to pass therethrough without substantial spreading. The electron multiplier includes additional structure for creating a high gain condition in the channels which are desired to be in an 'on' condition while simultaneously creating a low gain condition in the adjacent channels. Electrical potentials can be simply switched at the dynodes so as to change this first condition into a second condition where the relative gain parameters of the channels are reversed.

Electron multiplier with switchable beam confinement structure

An electron multiplier includes a plurality of staggered parallel dynodes. The dynodes include spaced confinement bumps along their lengths with active areas between the bumps. The confinement bumps and active areas therebetween define a plurality of channels which extend from a cathode at one end of the multiplier. Each channel traverses the staggered parallel dynodes and causes an electron beam to pass therethrough without spreading. The multiplier is useful in a display device which includes a plurality of line sources of electrons, e.g., a plurality of cathode stripes.

Electron multiplier with beam confinement structure

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.

Vane structure for a flat image display device

A metal sheet is provided with a plurality of slots which are disposed in parallel rows and columns. Charge sensing pads are disposed on an insulating layer on one surface of the metal sheet with a separate pair of the charge sensing pads being in abutting relation and sandwiching a separate slot. The sensing pads include a portion which extends beyond the length of the slot and is of a material having a high secondary emission ratio. The sensing pads have a capacitance to the metal layer such that they can be electrically charged to a common voltage level which permits a substantially uniform maximum electrical charge to pass into each one of the slots when the abutting sensing pads are discharged by line electron sources. The charge sensing pads may be repetitively charged, i.e., brought back to the common level, through secondary emission from the portions of the pads which extend beyond the slots. A plurality of substantially parallel modulating electrodes are disposed on, but insulated from, the other surface of the metal sheet. Each one of the modulating electrodes extends around one of the parallel columns of slots. The modulating electrodes control the charge which exits from each one of the slots during a charge-discharge cycle. The modulating mask is suitable for use with line electron sources to form a display having desirable characteristics. The modulation mask can be used in conjunction with feedback multiplier line sources as long as high energy electrons are eliminated through the use of high energy electron filters.

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Rocky Hill, NJ, United States of America

Carmen A Catanese