Colour cathode-ray tube apparatus with shadow mask

Details Colour cathode-ray tube apparatus with shadow mask Colour cathode-ray tube apparatus with shadow mask

H - Electricity

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J

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H01J 29/07 (2006.01) H01J 29/00 (2006.01) H04N 9/16 (2006.01) H04N 9/24 (2006.01) H04N 9/28 (2006.01)

Patent

CA 1151311

COLOUR CATHODE-RAY TUBE APPARATUS WITH SHADOW MASK ABSTRACT In shadow mask colour cathode-ray tube apparatus, the shadow mask is provided with slits or rows of slots extending from side to side of the mask and a line raster is con- strained so that the lines of the raster are collinear with the slits, there being just one slit to each line of the raster. Open loop control may be used to achieve collin- earity but closed loop control is preferred. Beam position signals may be derived from the shadow mask by sensing secondary emission from different phosphors on the gun side of the mask or by sensing currents generated in the mask. In the preferred embodiment the beams are dithered as they traverse the raster and the difference in the currents generated by a beam at the mask and at the conductive layer at the tube screen is detected. The first fundamental of the difference current indicates by its amplitude and phase the amount and direction of the misregistration of a beam and a slit. Different beams are distinguished by frequency multiplexing. UK9-79-003

352828

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