Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-09-06
1996-01-09
Lee, Benny
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
313414, H01J 2958
Patent
active
054831288
ABSTRACT:
A color cathode ray tube (CRT) includes a multi-beam electron gun capable of operating in two or more modes for use as either a television receiver display or as a high resolution video monitor. The electron gun directs a plurality of electron beams onto the CRT's display screen, with the electron beams arranged in two or more groups. In one group of electron beams, the beam forming portion of the electron gun provides small diameter electron beams having reduced spot size on the CRT's display screen for high video image resolution when used as a monitor for graphics and/or character display. In another group of electron beams, the beam forming portion of the electron gun provides electron beams having a larger diameter and current for increased video image brightness when used as a television receiver. Each group of electron beams includes a plurality of horizontally aligned electron beams, with each beam providing one of the primary colors of red, green, or blue. More than one group of horizontally aligned electron beams may be simultaneously directed onto the CRT's display screen for either tracing out a common horizontal scan line for increased video image brightness or for simultaneously tracing out separate scan lines to allow for reduced horizontal scan frequency. A monochrome arrangement directs either a selectable single larger diameter electron beam or a single smaller diameter electron beam onto the CRT's display screen.
REFERENCES:
patent: 4633244 (1986-12-01), Holtey et al.
patent: 5036258 (1991-07-01), Chen et al.
patent: 5287038 (1994-02-01), Hagar et al.
Hughes et al., A Novel High-Voltage Bipotential CRT Gun Design, IEEE Transactions on Consumer Electronics, vol. CE-25, No. 2, May 1979, pp. 185-192.
Bettendorf Justin P.
Chunghwa Picture Tubes Ltd.
Lee Benny
LandOfFree
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