Cathode ray tube and apparatus and method of controlling brightness

摘要

A control portion detects a level of video signals for each color when video signals are inputted from a frame memory to DSP circuits. Next, the control portion calculates an appropriate correction coefficient of each color to be used in modulation control of brightness, for every unit pixel or unit pixel array among a plurality of correction coefficients stored in its own memory in advance based on the detected signal level. The control portion instructs the DSP circuits to perform modulation of brightness by using the determined correction coefficient.