Patent ID: 8866857

Claim:
A device for adjusting white balance in a laser display system, having red, green, and blue laser beam sources, comprising: a temperature sensing unit for sensing the present temperatures of the laser beam sources; a detecting unit for measuring laser beam output intensity of the laser beam sources; a storing unit for storing reference values on allowable current ranges at different temperatures and laser beam output intensity at different temperatures, and reference values on wave length information on different laser beam output intensity at the same temperature; an adjusting value generating unit for comparing a measured value of the laser beam output intensity obtained from the detecting unit to the reference values obtained from the storing unit, to generate an adjusting value; a laser beam source driving unit for adjusting the laser beam output intensity of a relevant laser beam source according to a current value within the allowable current range or the adjusting value generated thus; and a control unit for searching the storing unit for the allowable current range corresponding to the present temperature sensed thus, or the reference value corresponding to the laser beam output intensity measured thus to control the adjusting value generating unit and the laser beam source driving unit, wherein the adjusting value generated from the adjusting value generating unit is calculated by the following equation, the adjusting value=aR+bG+cB+=a(R±x)+b(C±y)+c(B±z), where, R, G, B are the basic laser beam output intensity, a, b, c are the basic color ratio values for the white balance, and x, y, z are difference values between the measured values and the reference values, of red, green and blue laser beams, respectively.