Pixel unit drive circuit and method, pixel drive circuit and AMOLED (active matrix/organic light-emitting diode) display device

Abstract

The invention provides a pixel unit drive circuit and method, a pixel drive circuit and an AMOLED (active matrix/organic light-emitting diode) display device. The pixel unit drive circuit comprises a drive unit and a reverse bias control unit. Th drive unit is used for driving an OLED (organic light-emitting diode) and connected with a scanning line. The drive unit is connected with the OLED through the reverse bias control unit which is used for breaking the connection between the drive unit and the OLED and controlling the reverse bias of the OLED during the reverse bias period. The reverse bias period is a pre-selected period during the close stage of the scanning line in each scanning cycle. According to the arrangement, the OLED is prevented from staying in the direct current bias light-emitting state for the long term, thus polarization of the organic material of the OLED is reduced.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel unit driving circuit, a method, a pixel driving circuit and an AMOLED display device. Background technique [0002] In the prior art, due to the OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) in the DC-driven light-emitting display, the electric field of the DC driving voltage for a long time causes the polarization of ions inside the OLED, forming a built-in electric field, thereby making the OLED threshold The increase of the voltage greatly reduces the luminous efficiency of the OLED and shortens the lifetime of the OLED. [0003] like Figure 1A , Figure 1B As shown, the existing 2T1C pixel unit driving circuit includes a driving transistor DTFT, a storage capacitor C1 and an input transistor T, Figure 1A The DTFT and T used are n-type transistors, Figure 1B The DTFT and T used are p-type transistors, C1 is the storage capacitor, V SC...

AI Technical Summary

Problems solved by technology

It can be seen from the above that if Figure 1A , Figure 1B The shown 2T1C pixel unit drive circuit adds data voltage V through the data line DATA Afterwards, the display will always emit light within one frame, and the OLED will be in a DC biased light-emitting state for a long time, and the polarization of the organic material will accelerate, causing the built-in electric field of the OLED to increase, and the threshold voltage of the OLED will increase, greatly reducing the OLED’s luminescence. efficiency, shortening OLED lifetime

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