Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1993-02-19
1995-09-12
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
345127, 345210, H01J 2952
Patent
active
054499844
ABSTRACT:
This specification concerns cathode ray tube display apparatus comprises a cathode ray tube display screen (10). A beam generator (60,30) is provided for generating at least one electron beam in the cathode ray tube display screen (10) to produce a video image. Also provided is a line timebase circuit (40) for generating a line deflection signal to sequentially address the or each electron beam to successive pixels on the screen (10) in a line of a raster, and a frame timebase circuit (50) for generating an alternating frame deflection signal for sequentially addressing the or each electron beam to successive lines of the raster. The apparatus further comprises a standby circuit (110) connected to the line and frame timebase circuits (40,50). The standby circuit (40,50) switches the deflection signals generated by the timebase circuits (40,50) between first predetermined amplitudes and second predetermined amplitudes, less than the first predetermined amplitudes, in response to a control input (100) switching between first and second predetermined states. Because the amplitudes of the deflection signals are reduced when the display is configured to operate in standby mode, both the power dissipated by, and the stray electric and magnetic fields radiating from the display can be significantly reduced during periods of temporary non-use.
REFERENCES:
patent: 3437873 (1969-04-01), Eggert
Beanlands Peter
Beeteson John S.
Sawdon David
Aker David
Blum Theodore M.
International Business Machines - Corporation
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