Patent ID: 7026969

Claim:
A display device comprising; a test signal generator that generates a predetermined test pattern signal; a Red/Green/Blue cathode-ray-tube (RGB CRT) driving unit that amplifies the predetermined test pattern signal by a gain value and outputs the amplified predetermined test pattern signal as an RGB signal; a RGB CRT that generates a photoelectric signal that corresponds to the RGB signal output by the RGB CRT driving unit; a plurality of photo-sensors that are arranged over predetermined positions on a display screen and detect the photoelectric signals projecting into the RGB CRT; a plurality of amplifiers that amplify photoelectric signals detected by the plurality of photo-sensors; a control signal generator that generates a switching control signal and a buffer control signal using the clock signal; a multiplexer (MUX) that receives signals output by the plurality of amplifiers and selectively outputs a signal according to the switching control signal; an analog-to digital converter (ADC) that converts analog signals output by the MUX to digital signals; a buffer memory that sequentially stores the digital signals corresponding to the number of signals input to the MUX, the length of the digital signals corresponding to a number of digital filter taps, and sequentially outputs the digital signals corresponding to the number of digital filter taps; a digital filter that multiplies each of the digital signals output by the buffer memory corresponding to the number of digital filter taps by predetermined tap coefficients to remove noise; a register block that sequentially stores filtered digital signals output by the digital filter; and a microprocessor that reads a digital signal from the register block, uses the digital signal in a predetermined color coherency correction process, and generates a gain control signal for the color coherence correction.