Multichannel OLED (Organic Light Emitting Diode) life testing system based on Howland current pump

Abstract

The invention discloses a multichannel OLED (Organic Light Emitting Diode) life testing system based on a Howland current pump, comprising a lower computer, an upper computer and a plurality of OLED sample fixing boxes, wherein the lower computer comprises a micro controller module, an AD / DA (analog-to-digital / digital-to-analog) module, a current pump module, a signal processing and selecting module and a serial port; the current pump module, the OLED sample fixing boxes, the signal processing and selecting module, the AD / DA module, the micro controller module, the serial port and the upper computer are connected sequentially; and the AD / DA module is connected with the current pump module. The multichannel OLED life testing system disclosed by the invention adopts an improved Howland power pump design and provides the accurate and stable constant current output; combined with the upper computer design based on Labview, the multichannel OLED life testing system is simple, convenient and fast and supports the simultaneous testing operation of a plurality of samples, the half-life period of each point on the sample under certain constant current can be obtained from returned data, and the half-life period under any current can be calculated, so that the testing efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of semiconductor device detection, and in particular relates to a multi-channel organic light emitting diode (organic light emitting diode, OLED) life test system based on a Howland current pump. Background technique [0002] With the continuous development of OLED production technology and the continuous improvement of the luminous efficiency of OLEDs, OLEDs are more and more widely used in the fields of information display and lighting. In the process of commercialization of OLED, there are three key performance parameters that affect the progress of industrialization: luminous efficiency, service life and cost during mass production. Although the efficiency of OLED has been greatly improved, the service life is still an important factor limiting the development of industrialization. Therefore, it is of great significance to promote the industrialization of OLEDs by conducting OLED life tests, in-depth research on ...

AI Technical Summary

Problems solved by technology

However, no matter whether it is imported equipment from abroad or domestic related reports, only the half-life of a single point of the device under a specific working condition is simply obtained, and the life information of the device under test under different working conditions cannot be estimated.

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