Organic EL Display Burn-In Correction via Pre-Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic EL displays suffer from 'burn-in' due to non-uniform degradation of pixels, making it difficult to accurately correct image signals and requiring real-time monitoring and correction, which complicates the system.
Innovation Solution
An image display system that calculates the accumulated display time for each pixel based on pre-known still image data and degradation characteristics, allowing for pre-determination of correction amounts before image display, thereby reducing the need for real-time monitoring and simplifying the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time monitoring and correction of pixel degradation is implemented, then burn-in correction accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the accumulated display time for each pixel based on the known still image data and display duration before actual display occurs. The correction amounts are determined in advance using the formula C(x,y) = exp(k×T_acc(x,y)) - 1, where T_acc is the pre-calculated accumulated display time. This eliminates the need for real-time monitoring during display, significantly reducing system complexity while maintaining correction accuracy.
2Measurement precision
If accumulated display time is counted in real time, then correction accuracy is improved, but processing time and system resources increase
Solution Approach 1:
The patent performs the time accumulation calculation in advance before display, using the known display parameters (still image data and display time). The accumulated display time T_acc(x,y) is calculated as the sum of (display time × luminance level) for each pixel across multiple still images. This pre-calculation approach eliminates real-time processing requirements, reducing both processing time and system resource consumption while maintaining the accuracy needed for effective burn-in correction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate estimation and pre-determination of correction amounts for each pixel, effectively reducing burn-in in organic EL displays with a simpler system by using pre-stored data and dummy pixels for photodetection.
Implementation Method 1
displays using, as light-emitting elements of pixels, current drive type optical elements of which light emission luminance changes depending on the value of a current flowing therethrough, for example, organic EL (Electro Luminescence) elements
Implementation Method 2
a photosensor 19 detecting light emitted from the one or the plurality of dummy pixels 18
Data Source
AI summary
An image display includes: a display panel in which a plurality of pixels including first display elements, respectively, are two-dimensionally arranged; a drive section deriving, from a plurality of pieces of still image data and display times of a plurality of still images based on the plurality of pieces of still image data, an accumulated display time of each first display element in each still image data when the plurality of still images are sequentially displayed from one to another, and deriving, from the accumulated display time of each first display element derived in each still image data and degradation characteristic data stored in a memory section, a correction amount of each still image data in each pixel, and further sequentially displaying a plurality of still images based on a plurality of pieces of still image data corrected with use of the obtained correction amount from one to another.