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A degradation model for blue fluorescent OLEDs for compensation of decreased pixel luminance and lifetime enhancement of OLED displays

蓝色荧光 OLED 的退化模型，用于补偿像素亮度下降并延长 OLED 显示器的寿命

基本信息

批准号：
282450530
负责人：
Professor Dr.-Ing. Chihao Xu
金额：
--
依托单位：
Lehrstuhl für Mikroelektronik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/282450530?language=en
关键词：
degradation model blue fluorescent OLEDs

项目摘要

The aim of an OLED degradation model is to determine the efficiency of an OLED during the lifetime of an OLED display. This enables the compensation of the differential aging of the pixels and the suppression of the biggest problem of an OLED display, image sticking.In the previous project, a correlation model and a data counting model for the OLED degradation were developed. The correlation model correlates the measurable current drift with the drift of the efficiency, while the data counting model calculates the decreased efficiency from the accumulated stresses of the OLED pixel. The efficiency obtained from the correlation model and/or the data counting model is stored as the aging state and used for the next level of the degradation model, the electro-optical model. In this way, the efficiency in dependence on the aging state and the operating point can be simulated.The goal of this new project application is to suppress the image sticking artifact with a real-time compensation algorithm based on this novel electro-optic model. This should make the model applicable.In the first phase of the new project, the strengths of the correlation model and the data counting model will be combined. A specific algorithm is to be derived which, based on the electro-optical model, determines the efficiency as a function of the aging state and the operating point. The fact may be beneficial that the aging state for the real time operation can be considered as constant.Digital driving of AMOLEDs has some advantages particularly for the aging compensation. The operating point lies in a relatively narrow range with little color shift. The higher gray scale resolution necessary for the compensation can be easily and accurately realized with time-based digital driving. The image decomposition for digital AMOLEDs, however, requires some complexity. The image decomposition and the aging compensation form an interdependent system, so that special attention must be paid to the efficiency of the algorithm. An integrated method for image decomposition and aging compensation will be designed and developed in such a way that the logic complexity will increase just moderately.The value of the degradation model lies mainly in the suppression of the image sticking artifact, which can only be confirmed and evaluated by HW validation. The algorithm is implemented in an FPGA and is intended to drive a digital AMOLED prototype of medium size and high resolution specifically designed by us for that purpose. By performing a user test, the effectiveness of the aging compensation can be evaluated and the lifetime enhancement of OLED displays can be quantified. Finally, the potential challenges of aging compensation for analog driving are to be identified.

OLED退化模型的目的是确定OLED在OLED显示器寿命期间的效率。这使得能够补偿像素的差异老化，并抑制OLED显示屏的最大问题--图像粘连。在先前的项目中，建立了OLED退化的关联模型和数据计数模型。相关模型将可测量的电流漂移与效率的漂移相关联，而数据计数模型根据OLED像素的累积应力来计算降低的效率。将从相关模型和/或数据计数模型获得的效率存储为老化状态，并用于退化模型的下一级，即光电模型。这一新的工程应用的目标是基于这种新的电光模型的实时补偿算法来抑制图像粘连伪影。在新项目的第一阶段，将结合相关性模型和数据统计模型的优点。将推导出一种特定的算法，该算法基于电光模型来确定作为老化状态和工作点的函数的效率。可以将实时操作的老化状态视为常量，这一事实可能是有益的。AMOLED的数字驱动特别在老化补偿方面具有一些优势。工作点位于相对较窄的范围内，色移很小。通过基于时间的数字驱动，可以轻松而准确地实现补偿所需的更高的灰度分辨率。然而，数字AMOLED的图像分解需要一定的复杂性。图像分解和老化补偿是一个相互依存的系统，因此必须特别关注算法的效率。设计和开发了一种综合的图像分解和老化补偿方法，使得逻辑复杂度略有增加，退化模型的价值主要在于抑制图像粘连伪影，而这一点只能通过硬件验证来确认和评估。该算法在一片FPGA中实现，旨在驱动我们专门为此目的而设计的中等尺寸和高分辨率的数字AMOLED原型。通过执行用户测试，可以评估老化补偿的有效性，并且可以量化OLED显示器的寿命增强。最后，要确定模拟驾驶老化补偿的潜在挑战。