A full-color flat panel display using emission colors of red, green, and blue is increasingly required to have higher definition, higher aperture ratio and higher reliability. Rapid heating is achieved by placing a water adsorbent downstream of the fuel processor’s primary reactor, which converts a hydrocarbon-based fuel to a hydrogen-rich fuel. The amount of noise included in the input image signal and the frequency level of the input image signal are measured and the input image signal is selectively filtered based on the measured noise and frequency level, so that the noise included in the input image signal can be reduced with the image quality improved.