Color monitor with improved color accuracy and current sensor

摘要

A color monitor having a highly accurate video processing circuit for providing a high accuracy color CRT display is disclosed which utilizes three feedback loops in each of the three primary color channels, each feedback loop including both the final video amplifier and the CRT in order to achieve equalization and stabilization of their combined signal-to-brightness transfer characteristics against both CRT and circuit drift. The video processor circuitry also includes a D/A converter for generating a signal representative of the desired amplitude component for each primary color from a three bit digital input. By utilizing the three feedback loops, the color produced in the CRT display is independent of the operator set brightness and contrast settings and is maintained to within 10% of its desired value over varying temperature and adverse environmental conditions.