Calibration device of sub-pixel circuit, source electrode driver and data voltage compensation method

Abstract

The invention provides a calibration device of a sub-pixel circuit, a source electrode driver and a data voltage compensation method. The sub-pixel circuit comprises a driving transistor, a data line and a sensing line. The calibration device comprises a capacitance measurement circuit, a charge detection circuit and a parameter calibration component, wherein the capacitance measurement circuit is used for outputting capacitance measurement voltage which is related with sensing line capacitance of the sensing line; the charge detection circuit is used for detecting capacitance charging voltage on the sensing line capacitance of the sensing line under the condition that reference data voltage is applied to the data line; and the parameter calibration component is used for calculating an electrical parameter of the driving transistor according to the capacitance measurement voltage, the reference data voltage and the capacitance charging voltage. Therefore, an electrical parameter drift condition of the driving transistor in the sub-pixel circuit can be determined, and thus data voltage applied to the sub-pixel circuit can be adjusted according to the electrical parameter drift condition, so that a circumstance of non-uniform display brightness caused by electrical parameter drift is compensated.

Description

technical field [0001] The present invention relates to the field of organic light-emitting display technology, and more particularly relates to a calibration device, a source driver and a data voltage compensation method for a sub-pixel circuit in an organic light-emitting display device. Background technique [0002] Organic light-emitting display diodes (OLEDs), as a current-mode light-emitting device, have been increasingly used in high-performance displays. In an active matrix organic light-emitting display (Active Matrix OLED), a row of pixels in the pixel array is sequentially selected by row-by-row scanning, and a data voltage is applied to the selected row of pixels, and the generated data is generated according to the applied data voltage. OLED current, so as to realize the light-emitting display of OLED. [0003] AMOLED mostly uses low-temperature polysilicon thin-film transistors (LTPS TFT) or oxide thin-film transistors (OxideTFT) to construct sub-pixel circuit...

AI Technical Summary

Problems solved by technology

[0004] In addition, in a large-size AMOLED, due to the difference in the distance between each sub-pixel circuit and the data voltage output terminal of the source driver and the internal resistance of the data line itself, the final data voltage applied to each sub-pixel circuit is different from that of the source driver. There is a difference in the data voltage at the output of the data voltage of the

Similarly, in a large-size AMOLED, due to the difference in the distance between each sub-pixel circuit and the power supply voltage output terminal and the internal resistance of the power line itself, the final power supply voltage applied to each sub-pixel circuit is different from the power supply voltage at the power supply voltage output terminal. There is a difference in ARVDD

When the data voltage output terminal of the source driver outputs the same data voltage, the above data voltage difference and power supply voltage difference will also lead to differences in the OLED current in each sub-pixel circuit of the AMOLED, which is then reflected in the display brightness of each part of the AMOLED difference

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