Patent ID: 8044891

Claim:
A system for providing threshold voltage compensation of pixels comprising: a first switching element transferring a data signal; and a voltage compensation driver coupled between a power voltage and a display device, inducing a charging voltage on a first node according to a reference signal and generating a compensation voltage according to the charging voltage during a first period, and outputting a driving current according to the data signal and the compensation voltage to the display device during a second period following with the first period, wherein the charging voltage is higher than the power voltage, and the reference signal is pulled to the power voltage with in the first period and is pulled to ground within the second period, and wherein the power voltage is maintained during the first and the second periods, and the voltage compensation driver comprises a key transistor coupled between the power voltage and the display device, generating the driving current according to the data signal and the compensation voltage; a first capacitor coupled between the reference signal and the first node; and a second capacitor coupled between the first node and the key transistor, storing the compensation voltage, and the voltage compensation driver and the first switching element are coupled to a first scan line and a second scan line respectively, and the first scan line is asserted during the first period and the second scan line is asserted ruing the second period later than the first period.