Organic Light-Emitting Display Panel Lifespan Evaluation via Patterned Aging
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Solution Overview
Problem
Existing methods for evaluating the lifespan of organic light emitting display panels are hindered by initial luminance changes due to thin film transistor stress, leading to inaccurate and lengthy lifespan assessments.
Innovation Solution
A method and system that evaluates the lifespan by displaying different colors in specific pattern areas during an aging period, measuring luminance differences, and calculating the lifespan of light emitting elements based on these differences, minimizing the influence of thin film transistor stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lifespan evaluation methods are used, then comprehensive aging assessment is achieved, but initial luminance changes due to thin film transistor stress cause measurement inaccuracy and extended evaluation time
Solution Approach 1:
The evaluation panel is divided into multiple pattern areas (first pattern area, second pattern area, third pattern area, fourth pattern area) that are selectively driven during aging. This segmentation allows different regions to experience different stress conditions, enabling the isolation and elimination of TFT stress effects from the lifespan measurement of light emitting elements.
Solution Approach 2:
Different pattern areas are assigned different driving patterns during the aging period. The first and second pattern areas are driven to display first and second colors respectively, while the third and fourth pattern areas remain undriven or differently driven. This creates local quality differences that allow the measurement to focus specifically on light emitting element degradation rather than TFT stress effects.
2Reliability
If all pattern areas are driven during aging, then comprehensive stress testing is achieved, but TFT stress effects contaminate the lifespan measurement
Solution Approach 1:
The invention extracts and isolates the TFT stress effect from the lifespan measurement by using control pattern areas (third and fourth pattern areas) that are not driven or differently driven during aging. By comparing the luminance degradation of driven pattern areas against these control areas, the TFT stress component is separated and eliminated from the measurement, leaving only the light emitting element degradation.
Solution Approach 2:
The driving patterns applied to different pattern areas during aging are intentionally made asymmetric. The first and second pattern areas receive driving signals to display specific colors, while the third and fourth pattern areas receive different or no driving signals. This asymmetric treatment creates a controlled experiment where the difference in luminance degradation directly attributes to light emitting element stress rather than TFT stress.
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 reduces the initial luminance deviation period, shortens the evaluation time, and enhances the reliability of lifespan data by minimizing the impact of thin film transistor stress, providing accurate and efficient lifespan assessment.
Implementation Method 1
An organic light emitting display panel included in a display device displays an image by using an organic light emitting element (or an organic light emitting diode) that generates light by recombination of electrons and holes
Data Source
AI summary
A method for evaluating a lifespan of an organic light emitting display panel includes: aging an organic light emitting display panel, including first light emitting elements for emitting a first color, second light emitting elements for emitting a second color, and third light emitting elements for emitting a third color, during a preset aging period by displaying the first color in a first pattern area of the organic light emitting display panel and displaying a fourth color in a second pattern area of the organic light emitting display panel; measuring luminances of the first pattern area and the second pattern area by displaying the first color in the first pattern area and the second pattern area during a measurement period; and calculating a lifespan of the first light emitting elements based on the measured luminance of the first pattern area and the measured luminance of the second pattern area.