Method and system for lifetime aging of organic light emitting diodes oled

Abstract

The invention provides an organic light-emitting diode OLED life aging method and system; the method comprises the following steps: driving the OLED so as to control the OLED luminescent layer current according to the write-in voltage; detecting the OLED luminescent layer current so as to form a current detection value; obtaining a preset aging current value; adjusting the write-in voltage according to the difference value between the preset aging current value and the current detection value, driving the OLED according to the adjusted write-in voltage, thus keeping the OLED luminescent layer current at the preset aging current value. The method can accurately control the OLED luminescent layer current through closed loop constant current control, so a L-Aging process can be carried out under a condition in which the luminescent layer current and the preset aging current value basically have no error, thus preventing insufficient L-Aging or adverse burning caused by overhigh or overlow currents in the L-Aging process, improving the L-Aging process stability, better controlling the L-Aging amount in the L-Aging process, and improving the process yield rate.

Description

technical field [0001] The invention relates to the display field, in particular to a life aging method of an organic light emitting diode OLED and a life aging system of an organic light emitting diode OLED. Background technique [0002] In OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) devices, the lifetime of the OLED device is an important indicator for evaluating an OLED device. Aging (referred to as L-Aging) process. The aging indicators in the L-Aging process (brightness attenuation, efficiency reduction, and afterimage quality) are positively correlated with the current in the L-Aging process. The appropriate L-Aging amount can make the OLED material attenuate in brightness during use Lower, and can improve the afterimage quality. [0003] In the related process, when performing L-Aging, the current of the light-emitting layer of the OLED is usually controlled by a given fixed voltage, and the current generated by the OLED device is used to age t...

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Problems solved by technology

However, the problem of the related technology is that the open-loop control is relatively simple to implement, but it is impossible to achieve fine control

Moreover, due to the discreteness of TFT characteristics in the backplane circuit during the process, only the compensation circuit cannot guarantee the consistency of the given fixed voltage and output current, and the uniformity of the backplane circuit is not very good. Therefore, by giving a fixed write The method of inputting voltage will lead to a large deviation of the current of the light-emitting layer of the OLED (the maximum deviation can be about 400mA), so that the organic pixel material of the OLED device may be damaged and the power line may be burned at a high current, and the L-Aging may be insufficient at a low current. , so that the L-Aging process can not achieve the effect

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