ACTIVE MATRIX LIGHT EMITTING DIODE PIXEL STRUCTURE AND ITS METHOD

摘要

PROBLEM TO BE SOLVED: To correct electric parameters of a TFT and an OLED and to generate an OLED current excellently determined thereby in a pixel array.

SOLUTION: Each pixel block 1200 is connected to a detection pin (VDD/SENSE pin) 1210 at an end of a display. In normal display operation, the detection pin 1210 is connected to a VDD power supply through a transistor P1, but the detection pin is connected to a current detecting circuit 1334 through a transistor P2 during a measurement cycle. A measured current of each pixel block is gathered by an I/O device 1340, converted to a digital format, and saved for calibration of a data voltage. This saved information is used to correct a data voltage for coping with threshold voltage variation of the transistor and OLED turn-on voltage variation.

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