Patent ID: 8624823

Claim:
A light source assembly comprising: a light source assembly which emits light and comprises a red light source which emits red light, a green light source which emits green light and a blue light source which emits blue light, a detector which detects the light and generates a light signal based on a property of the light; an operator operably connected to the detector and which receives the light signal and calculates a color coordinate of the light source based on the light signal; a comparator operably connected to the operator and which compares the color coordinate of the light source to a predetermined reference color coordinate; and a control unit operably connected to the comparator and which controls separately pulse width modulation signals transmitted to the red light source, the green light source, and the red light source based on a result of the comparison of the comparator; wherein the comparator derives an equation of a first straight line which passes through a reference coordinate of a first color and a reference coordinate of a second color, derives an equation of a second straight line which passes through the reference coordinate of the first color and a color coordinate of a second color light source, derives an equation of a third straight line which passes through a color coordinate of a first color light source and the reference coordinate of the second color, and determines whether a y-intercept of the equation of the first straight line is located between a y-intercept of the equation of the second straight line and a y-intercept of the equation of the third straight line.