Patent ID: 9542883
Date: 2017-01-10
CPC Classifications: G09G

Claim:
1. A brightness control device in an OLED display device comprising: a computer system having either a PWM controller for converting and forwarding external brightness control information into a PWM (Pulse Width Modulation) signal and forwarding the PWM signal or a master for forwarding the brightness control data by using a data communication protocol; a selector for selecting either the PWM signal from the PWM controller or the brightness control data from the master; a normalizer for normalizing the PWM signal or the brightness control data from the selector into an external brightness adjusting gain and a preset optical compensation parameter into a optical compensation gain according to an optical characteristic of a picture display unit; a peak brightness value detector for analyzing a video data from the computer system to detect a peak brightness value; a first multiplier for multiplying the peak brightness value by the external brightness adjusting gain to produce a final peak brightness value; a maximum gamma voltage adjuster for adjusting R/G/B maximum gamma voltage values according to the final peak brightness value for the first time; a second multiplier for multiplying the R/G/B maximum gamma voltage values, adjusted by the maximum gamma voltage adjuster, by the external brightness adjusting gain to adjust the R/G/B maximum gamma voltage values for the second time; and a reference gamma voltage generator for generating R/G/B reference gamma voltage sets by using the R/G/B maximum gamma voltage values from the second multiplier.