Display device comprising a deflection unit and a deflection unit for a display device
AssigneeLG. Philips Displays
InventorLeendert Noordermeer
Life of this patent
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Abstract
A colour display device comprising a cathode ray tube and a deflection unit. The display device includes compensation magnets for correcting a raster distortion in the raster displayed on the screen. Said magnets (25, 26) comprise a shunt (25a, 26a) to increase the temperature coefficient of the permanent remanence. Preferably overcompensation occurs, i.e. the temperature coefficient is changed from a negative to a positive value.
Claims8
A colour display device comprising a cathode ray tube comprising a display screen, a means for generating at least one electron beam and a deflection unit for generating deflection fields for deflecting electron beam(s) across the display screen in two perpendicular directions (x, y) and having magnetic field-generating means at or near a display screen-facing end of the deflection unit for generating a magnetic field to reduce raster distortions, characterized in that the permanent magnets are made of a material having a negative temperature coefficient for the magnetic remanence(B(G)), said magnets being provided with a compensating shunt to increase the temperature coefficient of the magnetic remanence.
A deflection unit for a display device having a cathode ray tube with a display screen a means for venerating at least one electron beam and a deflection unit for generating deflection fields for deflecting electron beam(s) across the display screen in two perpendicular directions (x, y) and having magnetic field-generating means at or near a display screen-facing end of the deflection unit for generating a magnetic field to reduce raster distortions, characterized in that the permanent magnets are made of a material having a negative temperature coefficient for the magnetic remanence (B(G)), said magnets being provided with a compensating shunt to increase the temperature coefficient of the magnetic remanence.
Dependencies are inferred from the claim text.