Patent ID: 8605068

Claim:
A light emitting device including a light emitting unit for emitting light, comprising: a control unit for analyzing an image information continuously received, obtaining a first current level corresponding to a current for displaying a first image and a second current level corresponding to a current for displaying a subsequent second image, and extracting a differential value by comparing the first current level with the second current level, the control unit obtaining the first current level by analyzing pixel value information of the first image displayed on a display device; a differential amplifier, having a first input from the control unit of the first current level corresponding to a current for displaying the first image, and a second input of the second current level corresponding to a current for displaying the subsequent second image, for extracting the differential value; a power supply unit for supplying a level-adjusted analogue voltage to the light emitting unit by adjusting a voltage level of a drive voltage according to the differential value; and a memory for storing corrected values for the voltage level to be applied to the light emitting unit corresponding to the result of comparing the first and second current levels, wherein the first current level and the second current level are obtained separately, wherein the control unit adjusts a pulse width of a pulse width modulation (PWM) signal by using the corrected values, and wherein the power supply unit adjusts the voltage level by using the adjusted PWM signal as the differential value.