Display Lifespan Prediction Using Multilayer Test Panels
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Solution Overview
Problem
Existing methods for predicting the lifespan of display devices are inefficient and have high error rates, requiring extensive manufacturing and testing of samples.
Innovation Solution
A method involving a test panel with multiple light emitting layers and wavelength conversion layers to measure luminance changes over time, calculating pixel lifespan using luminance maintenance rates and color component ratios, allowing prediction without manufacturing a full display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to predict display device lifespan, then manufacturing and testing can be performed, but the evaluation time is extensive and the error rate is high
Solution Approach 1:
The patent divides the display device into multiple test panels with different configurations (single light emitting layer vs. multiple light emitting layers). By segmenting the testing process and using representative test panels, the method achieves accurate lifespan prediction without requiring full manufacturing and testing of every possible display device configuration, thus reducing evaluation time while maintaining precision.
Solution Approach 2:
The patent performs preliminary measurements of luminance changes on test panels before actual display device manufacturing. By measuring luminance at different times (initial luminance, luminance after usage, luminance maintenance rate) on simplified test structures, the method predicts lifespan beforehand, avoiding the need for extensive post-manufacturing testing and reducing overall evaluation time.
2Reliability
If existing methods are used to predict display device lifespan, then some prediction can be achieved, but the error rate is high
Solution Approach 1:
The patent focuses on measuring luminance changes in specific critical components (light emitting layers and wavelength conversion layers) rather than attempting to measure the entire display device. By localizing measurements to these key elements that primarily determine lifespan, the method improves prediction reliability and reduces error rates associated with measuring complex entire devices.
Solution Approach 2:
The patent uses test panels as simplified copies or representations of actual display devices. These test panels replicate the essential light emitting and wavelength conversion structures without the full complexity of commercial display devices. By measuring these representative copies, the method achieves reliable lifespan predictions with lower error rates compared to attempting to measure actual complex devices.
3Measurement precision
If full display devices are manufactured for testing, then accurate lifespan data can be obtained, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the essential lifespan-determining components (light emitting layers and wavelength conversion layers) from the full display device structure. By creating test panels that contain only these critical elements, the method obtains accurate lifespan data without requiring manufacturing of complete display devices, thus reducing manufacturing complexity and cost while maintaining measurement precision.
Solution Approach 2:
The patent uses simplified test panels as disposable or low-cost substitutes for expensive full display devices. These test panels are easier and cheaper to manufacture, allowing repeated measurements and experiments without the high cost and complexity of manufacturing actual display devices. The test panels serve their purpose accurately and can be discarded or reused without significant cost.
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
Reduces lifespan evaluation time and error rate by accurately predicting display device lifespan through luminance analysis, enabling more precise manufacturing and quality control.
Implementation Method 1
The self-light emitting element may include two opposite electrodes and a light emitting layer interposed between the electrodes. In the case of using the organic light emitting element as the self-light emitting element, the electrons and holes from the two electrodes are recombined in the light emitting layer to produce excitons, which transition from the excited state to the ground state, emitting light.
Implementation Method 2
a first wavelength conversion layer overlapping the first light emitting element in a thickness direction
Data Source
AI summary
A method of predicting a lifespan of a display device includes preparing a test panel including a test light emitting element including a first and second test light emitting layers, measuring a luminance of the first and second color of the test panel to acquire first and second deterioration data of the first and second color, calculating a lifespan of a pixel based on the first and second deterioration data, and a first and second color component ratio of first emission light for a thickness of a wavelength conversion layer. The pixel includes a light emitting element emitting the first emission light and mixed light of the first and second color, and the wavelength conversion layer, and a light emitting layer of the light emitting element includes a first light emitting layer emitting light of the first color, and a second light emitting layer emitting light of the second color.