Method of compensating AMOLED power supply voltage drop

A method of compensating AMOLED (active matrix organic light emitting diode) power supply voltage drop, comprising steps of:

• step 1, measuring a brightness value L of each column of light-emitting elements row by row of a panel by starting from a COF (chip on film) end of the AMOLED;
• step 2, forming a brightness variation curve of the each column of light-emitting elements caused by IR Drop according to the brightness value L of the each column of light-emitting elements measured in step 1;
• step 3, calculating a voltage value for compensation of every two adjacent columns of light-emitting elements from difference values between the brightnesses of every two adjacent columns of light-emitting elements according to a ratio conversion between a brightness difference ΔL and a voltage difference ΔV, i.e. ΔV=α·ΔL, wherein α is a scaling factor;
• wherein a voltage value for compensation required for a second column of light-emitting elements relative to a first column of light-emitting elements is a first compensation value ΔV1, and a voltage value for compensation required for a third column of light-emitting elements relative to the second column of light-emitting elements is a second compensation value ΔV2, and same definitions are repeated until a last pair of two adjacent columns of light-emitting elements;
• step 4, making no compensation to a data voltage of the first column of light-emitting elements, and adding the first compensation value ΔV1 to a data voltage of the second column of light-emitting elements, and adding a sum (ΔV1+ΔV2) of the first compensation value and the second compensation value to a data voltage of the third column of light-emitting elements and repeating until the last column of light-emitting elements when a sequence controller transmits data voltage signals for showing images;
• in the brightness variation curve of step 2, the measured brightness value of the each column of light-emitting elements decreases when a column number of the light-emitting elements increases;
• wherein a calculation employed in step 3 is:
• ΔVn−1=α·ΔLn−1=α·(Ln−Ln−1)
• ΔVn−1 is an n−1th voltage value for compensating an nth and an n−1th light-emitting element lines, and ΔLn−1 is a brightness difference value of a brightness Ln of the nth column of light-emitting elements and a brightness Ln−1 of the n−1th column of light-emitting elements, and n is a positive integer larger than 1;
• wherein a calculation employed in step 4 is:
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• Vn represents a ultimately required voltage for the nth column of light-emitting elements, and Vdata represents the data voltage, and n is a positive integer larger than 1.