CRT control system.

摘要

There is described a picture quality control system for use with a multi-beam cathode ray tube raster scan display device (24). The display device generates an image comprising a multiplicity of parallel, nonoverlaping bands of pixels, each band of pixels comprising a set of parallel lines of pixels.

The control system (26) includes a linearity correction circuit and a dynamic detwist correction circuit. The linearity oorrection circuit adjusts the distance between neighboring bands of pixels. The dynamic detwist correction circuit ad- juststhe relative positions of the electron beams generated by the cathode ray tube.