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US 8,450,917 B2Granted
High-definition cathode ray tube and electron gun
AssigneeAltera Corporation
InventorsThomas A. Skupien, Byron G. Zollars
Life of this patent
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Abstract
A high-definition CRT is provided having an electron gun to produce high beam current without increasing spot size and to provide lower electrical power requirements at high beam-modulation frequencies. The electron gun includes beam-forming electrodes and a lens. Each beam-forming electrode has several aperture clusters operable to form several collimated beams of electrons. In addition, the lens is operable to focus the several collimated beams of electrons onto a display screen.
Claims20
An electron gun comprising:
- a plurality of beam-forming electrodes, each beam-forming electrode of the plurality of beam-forming electrodes having a plurality of aperture clusters operable to form a plurality of collimated beams of electrons;
- an insulating layer provided between opposing surfaces of each electrode of the plurality of electrodes, the insulator layer having a plurality of aperture clusters substantially aligned with the plurality of aperture clusters of opposing surfaces of each beam forming electrode, wherein a size of each aperture of the plurality of aperture clusters of the insulating layer is greater than a size of each aperture of the plurality of aperture clusters of each beam forming electrode;
- a support bracket having a recessed region, wherein the plurality of beam-forming electrodes are enclosed within the recessed region;
- and
- a lens operable to focus the plurality of collimated beams of electrons onto a display screen.
2 more elements
An electron gun comprising:
- a support bracket;
- and
- a monolithic structure that includes a plurality of electrodes operable to form beams, the monolithic structure having a plurality of aperture clusters for each electrode of the plurality of electrodes, wherein the monolithic structure is enclosed within a recessed region of the support bracket and wherein a first electrode from the plurality of electrodes is in contact with the support bracket to establish an electrical connection from the first electrode through an extension extending from the support bracket.
A method for operating a cathode ray tube, the method comprising:
- supplying electrons from a cathode;
- forming a plurality of collimated beams of electrons by applying selected values of electrical voltage to a plurality of electrodes, each electrode of the plurality of electrodes having a plurality of aperture clusters, wherein the plurality of electrodes is enclosed within a recessed region of a support bracket, wherein each aperture from the plurality of aperture clusters is utilized to form one of the collimated beams of electrons from the plurality of collimated beams of electrons, and wherein an insulating layer is provided between opposing surfaces of each electrode of the plurality of electrodes, the insulator layer having a plurality of aperture clusters substantially aligned with the plurality of aperture clusters of opposing surfaces of each electrode, wherein a size of each aperture of the plurality of aperture clusters of the insulating layer is greater than a size of each aperture of the plurality of aperture clusters of each electrode;
- and
- focusing the plurality of collimated beams of electrons onto a display.
1 more element
Dependencies are inferred from the claim text.