The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1995
Filed:
Feb. 19, 1993
International Business Machines Corporation, Armonk, NY (US);
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.