Organic light emitting diode display device and method for sensing characteristic parameters of pixel driving circuits

摘要

Disclosed are an OLED display device and method for sensing characteristic parameters of pixel driving circuits. The display device includes a display panel including pixels each having a light emitting element and a pixel driving circuit for independently driving the light emitting element, and a characteristic parameter detecting unit for driving the pixel driving circuit of one of the plural pixels, which is a sensing pixel, sensing a voltage discharged in accordance with characteristics of a driving TFT in the pixel driving circuit of the sensing pixel, on a data line connected to the pixel driving circuit of the sensing pixel, among data lines connected to respective pixel driving circuits of the pixels, and detecting a threshold voltage (Vth) of the driving TFT and a deviation of a process characteristic parameter (k-parameter) of the driving TFT, using the measured voltage.

主权项

1. An organic light emitting diode (OLED) display device comprising:
a display panel comprising a plurality of pixels each having a light emitting element and a pixel driving circuit for independently driving the light emitting element; and a characteristic parameter detecting unit for sensing characteristic parameters of the pixel driving circuit in each of the plural pixels, the characteristic parameter detecting unit driving the pixel driving circuit of one of the plurality of pixels as a sensing pixel, sensing a first voltage output from the pixel driving circuit of the sensing pixel in accordance with characteristics of a driving thin film transistor (TFT) in the pixel driving circuit of the sensing pixel and detecting a threshold voltage (Vth) of the driving TFT using the sensed first voltage, wherein the characteristic parameter detecting unit drives the pixel driving circuit of the sensing pixel using a data voltage compensated for the detected threshold voltage (Vth), senses a second voltage output from the pixel driving circuit of the sensing pixel responsive to driving the pixel driving circuit using the data voltage compensated for the detected threshold voltage (Vth), and detects a deviation of a process characteristic parameter (k-parameter) of the driving TFT using the sensed second voltage.