Resources Contact Us Home
Color cathode ray tube display apparatus with compensation for errors due to interfering magnetic fields

Image Number 2 for United States Patent #4410840.

A color cathode ray tube display apparatus is provided with compensation for errors due to interfering magnetic fields in which a deflection yoke causes the electron beams to raster scan across the tube, a convergence assembly on the neck of the cathode ray tube adjusting the beam convergence. Errors in the waveforms suppied to the radial convergence assembly are caused by high frequency magnetic field coupling between the yoke and the convergence assembly via the internal magnetic structure 7 of the cathode ray tube. A compensating coil 11, placed adjacent the convergence coil unit 12, 16 supplies compensating current through resistor 20 to the amplifier 15 driving the convergence coil unit, thus avoiding a fringe on the left-hand side of the screen. Alternatively, compensating current can be derived from the line flyback pulse or the logic signal initiating line flyback.

  Recently Added Patents
Method and system for dynamic digital rights bundling
Microporous membranes and methods for producing and using such membranes
Organic light emitting diode display device and method of fabricating the same
Scanning optical positioning system with spatially triangulating receivers
Managing aging of silicon in an integrated circuit device
Content distribution system, mobile communication terminal device, and computer readable medium
Process for preparation of Efavirenz
  Randomly Featured Patents
Plural mode recirculating document handler
Reinforced metal shell golf club head, with keel
Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)
High temperature fuel cell system with integrated heat exchanger network
Activating silicoaluminophosphate compositions
Demolition hammer head
Insulated grocery cart cooler
Call control method for a radio system
Cardboard container for bottles and the like
Semiconductor device and method of manufacturing such a semiconductor device