Display Panel Lifespan Evaluation for Mixed-Color Degradation

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Solution Overview

Problem

Existing methods for evaluating the lifespan of organic light-emitting display panels, particularly in mixed color areas, are inaccurate and costly, as they fail to account for the differential deterioration rates of individual color components, leading to unreliable lifespan predictions.

Innovation Solution

A method and system for evaluating the lifespan of display panels by measuring single color and mixed color luminance retention rates at multiple time points, calculating mixed color spectrums and offset values, and using photodiodes and luminance meters to accurately determine the mixed color luminance retention rate, thereby accounting for visual characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional lifespan evaluation methods are used for mixed color areas, then the evaluation process is simplified, but the measurement precision and reliability of lifespan prediction deteriorate due to failure to account for differential deterioration rates of individual color components

Engineering Contradiction:

Improvelifespan prediction accuracyVSAvoidevaluation method complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the mixed color area evaluation into individual color component evaluations. It measures the luminance retention rates of red, green, and blue sub-pixels separately, then combines these segmented measurements to determine the overall mixed color area lifespan, thereby achieving precise prediction while maintaining manageable evaluation complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the evaluation parameter from direct mixed color area measurement to individual color component measurement. By measuring luminance retention rates of red, green, and blue components separately and using their weighted combination, the method achieves higher precision in lifespan prediction

Inventive Principle:

Principle #35Parameter changes

2Reliability

If individual color component measurements are performed separately, then the lifespan prediction accuracy improves, but the measurement time and evaluation cost increase

Engineering Contradiction:

Improvelifespan evaluation reliabilityVSAvoidevaluation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent merges the evaluation of multiple color components into a unified lifespan prediction model. By combining the luminance retention rates of red, green, and blue components using their luminance ratios as weights, the method achieves reliable lifespan prediction for mixed color areas while streamlining the evaluation process

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal evaluation method that can assess both individual color components and mixed color areas using the same measurement system. The luminance retention rate measurements serve multiple purposes: evaluating single color areas directly and serving as basis for mixed color area evaluation through weighted combination

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables accurate and cost-effective evaluation of the lifespan of mixed color areas in display panels by compensating for differential deterioration rates, reducing evaluation costs and improving prediction accuracy.

Implementation Method 1

measuring first single color luminance retention rates of the first to third single color areas and a first mixed color luminance retention rate of the mixed color area at a plurality of luminance measurement time points

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Implementation Method 2

Organic light-emitting display panels are display panels that display images using organic light-emitting elements (or organic light-emitting diodes) that emit light by recombination of electrons and holes

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12586497B2Method for evaluating lifespan of display panel and lifespan evaluation system for display panel

Publication Date: 2026.03.24 SAMSUNG DISPLAY CO LTD

AI summary

A method for evaluating a lifespan of a display panel includes deteriorating a display panel including a first single color area, a second single color area, a third single color area, and a mixed color area, measuring first single color luminance retention rates of the first to third single color areas and a first mixed color luminance retention rate of the mixed color area at luminance measurement time points, calculating mixed color spectrums of the mixed color area at the luminance measurement time points based on second single color luminance retention rates of the first to third single color areas converted from the first single color luminance retention rates, calculating mixed color offset values based on the mixed color spectrums, and calculating a second mixed color luminance retention rate of the mixed color area by applying the mixed color offset values to the first mixed color luminance retention rate.