Patent ID: 9653024
Date: 2017-05-16
CPC Classifications: G09G

Claim:
1. A method of compensating AMOLED IR Drop, comprising steps of: step 1, providing an AMOLED display panel, comprising: a calculation unit, a storage unit, a compensation unit and a plurality of pixel driving circuits; the pixel driving circuit at least comprises two N-type thin film transistors, a capacitor and an organic light emitting diode, wherein the N-type thin film transistor coupled to the organic light emitting diode is a drive thin film transistor; first, employing the storage unit to set power supply voltages of respective pixel driving circuits coupled in series on the same power supply line to be a standard power supply voltage, which is set to be: wherein n is an integer greater than 1; wherein OVdd step2, the calculation unit reads the power supply voltages of respective pixel driving circuits from the storage unit, and calculates driving currents corresponding to the power supply voltages of respective pixel driving circuits, and the calculation equations are: Ids i represents the driving current of the ith pixel driving circuit, and K represents a configuration parameter of the drive thin film transistor in respective pixel driving circuits, and VGS i represents a gate-source voltage of the drive thin film transistor in the ith pixel driving circuit, and Vth represents a threshold voltage of the drive thin film transistor in the respective pixel driving circuits, and λ represents a coefficient, and VDS i represents a source-drain voltage of the drive thin film transistor in the ith pixel driving circuit; Vdata wherein i=1, 2, . . . n; step 3, the calculation unit reversely obtains the power supply voltages OVdd wherein R is an equivalent resistance of the power supply line between every two adjacent pixel driving circuits; then, a first iterated operation is accomplished; then, the calculation unit stores the reversely obtained power supply voltages OVdd step 4, the calculation unit calculates and compares whether a ratio of the difference ΔOVdd step 5, the compensation unit performs adjustment and compensation to the initial values Vdata