Flexible folding screen and its threshold voltage compensation method and compensation device

Abstract

The present application provides a flexible folding screen and its threshold voltage compensation method and compensation device. The compensation method adjusts the first driving voltage signal and / or The second driving voltage signal for driving the thin film transistor in the non-folding region, that is, inputting different driving voltage signals to the folding region and the non-folding region, forwardly compensating the threshold voltage of the folding region and / or reversely compensating the threshold voltage of the non-folding region , reducing the threshold voltage drift of the folding region and / or increasing the threshold voltage drift of the non-folding region, so that the difference between the first driving voltage signal and the second driving voltage signal can compensate the first threshold voltage of the folding region The difference between the second threshold voltage of the folding area and the non-folding area, so that the driving current for driving the thin film transistor in the folding area and the non-folding area is the same, that is, the brightness of the folding area and the non-folding area are consistent, and the display unevenness is avoided. .

Description

technical field [0001] The present application relates to the field of display technology, and in particular to a flexible folding screen and its threshold voltage compensation method and compensation device. Background technique [0002] Currently, active-matrix organic light-emitting diodes (AMOLEDs) are widely used in the development of flexible foldable panels due to their flexibility. When the flexible foldable panel is not in use, it needs to be placed in a folded state for a long time, so that the thin film transistors in the folded area will be affected by stress for a long time, and the threshold voltage of the thin film transistors in the folded area will drift. Fig. 1 (a) is the transfer characteristic curve of the N-type thin film transistor in the prior art, and Fig. 1 (b) is the transfer characteristic curve of the P-type thin film transistor in the prior art, wherein, the solid curve is the transfer characteristic of the threshold voltage without drift The do...

AI Technical Summary

Problems solved by technology

[0004] Although the current flexible folding panel can compensate the drift of the threshold voltage of the thin film transistor to a certain extent, the compensation range is generally only about 0.5V.

When the threshold voltage of the thin film transistor in the folded area changes greatly, the brightness of the folded area will change significantly, and there is a significant difference in the brightness of the folded area and the non-folded area, which will cause the display unevenness (Mura) of the flexible foldable panel.

[0005] Therefore, there is a need for a method and device capable of compensating the threshold voltage of the thin film transistor in the folding area of ​​the flexible folding screen, so as to avoid the phenomenon of non-uniform display (Mura) in the case of long-term folding of the flexible folding panel

Images