Algorithm and device for improving lifespan of oled

A technology of life and algorithm, applied in static indicators, instruments, etc., can solve the problems of limited life efficiency of OLED, no consideration of display effect, decrease of aperture ratio, etc., to achieve high accuracy, ensure brightness uniformity, and prolong life effect.

Inactive Publication Date: 2019-05-03
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0004] With the continuous improvement and improvement of OLED production and packaging technology, it has become more and more difficult to improve the life of OLED in terms of technology; internal circuit compensation will increase the number of TFTs and capacitors, which will lead to a decrease in aperture ratio, thus improving OLED life. The efficiency is limited; the improvement of external circuit compensation and image processing methods has unlimited possibilities for improving the life of OLEDs. A large number of scholars have concentrated their research. Among them, Kyonghwan Oh et al. proposed an OLED life improvement algorithm based on increasing the duty cycle of OLED luminescence time And combined with digital hardware circuit to realize [5] ([5]Kyonghwan Oh,Seong-KwanHong and Oh-Kyong Kwon Lifetime Extension Method for Active MatrixOrganicLight-Emitting Diode Displays Using a Modified Stretched Exponential DecayModel,[J]IEEE Electron Device Letters,VOL.36,NO.3,March 2015) , but this method is only suitable for digital circuits, and this method does not consider the actual display effect

Method used

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  • Algorithm and device for improving lifespan of oled
  • Algorithm and device for improving lifespan of oled
  • Algorithm and device for improving lifespan of oled

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no. 1 example

[0062] Based on the OLED lifetime improvement algorithm and the optimization method of the OLED lifetime improvement algorithm proposed above, the above method was implemented with an OLED sample provided by a certain company. In the embodiment, the OLED is lit with 5000 nits as the initial brightness. Considering that different pixels of the image display different brightnesses, the degree of attenuation is different, resulting in different uniformity. The uniformity of the LCD display is greater than 75%, so it needs to be considered when optimizing the OLED life compensation algorithm. Make the display uniformity greater than 75%, and determine the lower limit L of OLED brightness x 75% L 0 That is 3750nits; for the actual OLED driving capability, the maximum current corresponding to the OLED brightness can reach 15000nits, so the brightness compensation limit L is determined max for 15000nits; for L y For cyclic processing, the implementation process adopts ΔL as 1% L 0...

no. 2 example

[0066] refer to Figure 6 , Figure 6 It is a block diagram of an implementation device for an OLED lifetime improvement algorithm, including a compensation data calculation module 601, a brightness data calculation module 602, a brightness data storage module 603, an attenuation degree calculation module 604, an attenuation degree storage module 605 and a detection and judgment module 606.

[0067] The main function of the calculation compensation data module 601 is to calculate the corresponding relationship between gray scale and brightness and the relationship between brightness and voltage or current through the N and α values ​​sent by the detection and judgment module 606, and then send the brightness data to the calculation brightness The data module 602 sends the voltage or current data to the OLED drive module 607; the calculation brightness data module 602 is to calculate the brightness data sent by the calculation compensation data module 601; the storage brightnes...

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Abstract

The present invention discloses an OLED (Organic Light Emitting Diode) life improvement algorithm and device. According to an OLED brightness decay model, an OLED luminescent device life improvement algorithm is provided through combination of OLED actual hardware driving capability. The OLED luminescent device life improvement algorithm employs a method for improving driving current and voltage of the OLED when the brightness of the OLED decays to Lx when the OLED is lightened by an initial brightness L0 to improve the brightness of the OLED to Ly, and employs an optimization algorithm to obtain three optimal parameters, namely a value of brightness decay lower limit Lx, a Ly value and the number mbest of improvement times so as to effectively reach the purpose of prolonging the OLED life. The OLED life improvement algorithm and device discloses a device for realizing the OLED life improvement algorithm. The device comprises a calculation compensation data module, a calculation brightness data module, a storage brightness data module, a calculation decay degree module, a storage decay degree module and a detection determination module.

Description

technical field [0001] The invention relates to an algorithm and a device for improving the service life of an organic light-emitting device (hereinafter referred to as OLED). According to the luminance attenuation characteristics of OLED, the luminance attenuation curve of OLED is corrected, considering the hardware driving capability and the maximum attenuation degree α that OLED can compensate limit Optimizing the OLED life-span improvement algorithm to determine the optimal improvement parameters; meanwhile, an OLED life-span improvement algorithm device is proposed according to the OLED life-span improvement algorithm of the present invention. The OLED lifetime improvement algorithm and device can be applied in fields such as OLED lighting and display. Background technique [0002] Organic Light Emitting Diode (Organic Light Emitting Diode) has many advantages such as self-illumination, high brightness, high contrast, fast response, wide viewing angle, simple structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G2320/0233
Inventor 张小宁夏世东屠震涛樊瑞黄泰钧付舰航
Owner XI AN JIAOTONG UNIV
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