Patent ID: 7408557

Claim:
An apparatus for adjusting a brightness and a color temperature of a screen on which input RGB color signals are displayed, the apparatus comprising: a RGB color signal generator to detect a maximum value of each of the RGB color signals, to compare the maximum values, to detect a color signal having a higher maximum value than the other color signals of the RGB color signals, to increase the color temperature of the detected color signal to a predetermined value to compensate for the color temperature of the detected color signal, to detect a total maximum value of the RGB color signals, and to store the total maximum value of the RGB color signals; and a system controller to provide a predetermined critical value, the predetermined value, and data on conditions for detecting a color signal having the higher maximum value than the other color signals to the RGB color signal generator, wherein the RGB color signal generator increases or decreases a brightness level of an image displayed on the screen by one of a plurality of predetermined ratios based on the comparison result, wherein the RGB color signal generator generates RGB color signals having decreased brightness by decreasing the brightness level of the image by one of the plurality of the predetermined ratios if the total maximum value is greater than a first predetermined critical value, determined in a case wherein a brightness level of pixels in an area of the screen from which the total maximum value is detected corresponds to full white, wherein the RGB color signal generator generates RGB color signals having increased brightness by increasing the brightness level of the image by one of the plurality of the predetermined ratios if the total maximum value is less than a second predetermined critical value, determined in consideration of a case wherein a brightness level of pixels in the area of the screen from which the total maximum value is detected corresponds to full black, and wherein the detecting and storing the total maximum value of the RGB color signals includes windowing a predetermined area of the screen, and then detecting the total maximum value of the RGB color signals in the predetermined area.