Patent ID: 7884792

Claim:
A method of extracting an optimized digital variable resistor value of a display panel, the method comprising: varying a digital variable resistor value, which is obtained by digitalizing a voltage level of a common voltage, three times and applying the varied digital variable resistor values to the display panel; measuring brightness values of a screen of the display panel; extracting flicker values corresponding to the varied digital variable resistor values using the brightness values; and extracting an optimized digital variable resistor value representing a minimum flicker value of the flicker values, wherein the extracting of the optimized digital variable resistor value includes: generating first, second and third coordinate values, in which the first, second and third coordinate values have x-coordinate values representing the varied digital variable resistor values, and y-coordinate values representing the flicker values; calculating a first linear function corresponding to a first straight line connecting two coordinate values of the first to third coordinate values, and a second linear function corresponding to a second straight line based on the first linear function and the other coordinate value of the first to third coordinate values; and extracting an x-coordinate value at an intersection point, at which the first and second straight lines intersect with each other, as the optimized digital variable resistor value using the first and second linear functions.