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

A technology of life test and current pump, applied in the direction of single semiconductor device testing, etc., can solve the problem of not being able to estimate the life information of the device under test, etc., to meet the needs of OLED life test, the current is accurate and stable, and the overall cost is reduced.

Inactive Publication Date: 2013-07-10
SHANGHAI JIAO TONG UNIV
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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...

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

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Embodiment Construction

[0022] The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

[0023] Considering the original intention of the design: miniaturization and intelligence, such as figure 1 , figure 2 As shown, the multi-channel OLED lifetime test system based on the Howland current pump of the present invention is mainly composed of three parts: the lower computer 1, the upper computer 2 and several OLED sample fixing boxes 3 . The upper computer 2 and the fixed OLED sample box 3 are respectively connected with the lower computer 1 .

[0024] Wherein, the OLED sample fixing box 3 includes a photoelectric signal acquisition circuit, an OLED sample fixing socket and a signal transmission interface with a lower computer. When used for sample detection, in a closed environment, the OLED sample fixing box 3 is no...

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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 ...

Claims

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Application Information

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IPC IPC(8): G01R31/26
Inventor 石鑫栋何谷峰
Owner SHANGHAI JIAO TONG UNIV
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