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Method for assessing service life of AMOLED (active matrix/organic light emitting diode) microdisplay

A technology for microdisplay and life evaluation, applied in static indicators, instruments, etc., can solve problems such as affecting the life of OLED devices

Active Publication Date: 2011-10-19
YUNNAN NORTH OLIGHTEK OPTO ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different multilayer film structure designs and material applications will also significantly affect the life of OLED devices

Method used

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  • Method for assessing service life of AMOLED (active matrix/organic light emitting diode) microdisplay
  • Method for assessing service life of AMOLED (active matrix/organic light emitting diode) microdisplay
  • Method for assessing service life of AMOLED (active matrix/organic light emitting diode) microdisplay

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: The technical solution of the present invention will be described in detail in conjunction with the accompanying drawings and the lifetime evaluation process of a top-emission type white light AMOLED with a typical structure.

[0030] (1) First, under the driving of the same duty cycle and different current driving signal period T, the accelerated aging test of the device was performed on 6 samples of AMOLED microdisplays at higher brightness;

[0031] What drives the AMOLED microdisplay is a positive constant current, reverse ground periodic signal, and the time of the forward constant current is t 1 , during which the AMOLED is in the working (lit) state; the reverse grounding time is t 2 , during which the AMOLED is not working, the entire cycle time is T, t 1 / T is defined as the duty ratio Ton of the drive signal. Among them, T=18ms, t 1 =16ms, t 2 =2ms, T on =8 / 9.

[0032] The AMOLEDs of the 6 samples selected for the accelerated aging test hav...

Embodiment 2

[0056] Embodiment 2: The technical solution of the present invention will be described in detail in conjunction with the accompanying drawings and the life evaluation process of the top emission type and green light AMOLED with a typical structure.

[0057] (1) First, under the driving of the same duty cycle and different current driving signal period T, the accelerated aging test of the device was performed on 6 samples of AMOLED microdisplays at higher brightness;

[0058] Drive periodic signal, T=50ms, t 1 =25ms, T on =1 / 2, the specific current value and brightness value are as follows:

[0059] I 0 1 =12.0mA, L 0 1 =8700cd / m 2 ,

[0060] I 0 2 =11.5mA, L 0 2 =8400cd / m 2 ,

[0061] I 0 3 =11.0mA, L 0 3 =8100cd / m 2 ,

[0062] I 0 4 =10.0mA, L 0 4 =7500cd / m 2 ,

[0063] I 0 5 =9.5mA, L 0 5 =7200cd / m 2 ,

[0064] I 0 6 =9.0mA, L 0 6 =6900cd / m 2

[0065] During the aging test, the brightness L of the display corresponding to different time ...

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PUM

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Abstract

The invention discloses a method for assessing the service life of an AMOLED (active matrix / organic light emitting diode) microdisplay, relating to a method for assessing the service life of an OLED (organic light emitting diode) display. The method comprises the steps of: carrying out an accelerated ageing test of a sample; establishing a brightness decay theoretical model for the accelerated ageing process; analyzing the brightness decay theoretical model; and establishing a service life prediction model so as to calculate the half-life period for assessing the service life.

Description

technical field [0001] The invention relates to a life evaluation method of an OLED (organic light emitting diode) display, in particular to a life evaluation method of an AMOLED (active matrix organic light emitting diode) microdisplay. Background technique [0002] OLED or Organic Light Emitting Diode is a technology that has developed rapidly in recent years. In terms of driving methods, OLED can be divided into active matrix (AMOLED) and passive matrix (PMOLED). Generally speaking, those with a screen diagonal below 1 inch are called OLED microdisplays. Compared with traditional LCDs, OLED displays have the advantages of self-illumination, wide viewing angle, fast response time, high luminous efficiency, low operating voltage, thin panel thickness, wide operating temperature range, flexible manufacturing, and low production cost. As the next generation of mainstream display technology, the only slight disadvantage is that OLED has a short lifespan. [0003] OLED is an ...

Claims

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Application Information

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IPC IPC(8): G09G3/00
Inventor 胡赞东汪博炜
Owner YUNNAN NORTH OLIGHTEK OPTO ELECTRONICS TECH
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