Display Panel Lifespan Measurement via Region Segmentation
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Solution Overview
Problem
Existing display devices face challenges in objectively measuring the light emission efficiency and lifespan of self-luminous display panels, particularly due to the interference of the polyimide substrate charging phenomenon, which complicates the distinction between luminance degradation caused by the substrate and the organic light emitting layer's degradation.
Innovation Solution
A method is introduced that involves a display panel with distinct regions, where one region emits light continuously and another region does not, allowing for the application of different data voltages to measure the luminance change and separate the effects of light emission efficiency and polyimide substrate charging, thereby objectively determining the lifespan of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light is continuously emitted from the light emitting layer, then the display device can function as a self-luminous display, but the light emission efficiency of the light emitting layer deteriorates over time
Solution Approach 1:
The display panel is divided into a first region where sub-pixels emit light continuously and a second region where sub-pixels do not emit light continuously. This segmentation allows separate measurement of light emission efficiency degradation in the first region from other factors affecting the second region, enabling objective assessment of the light emitting layer's reliability while maintaining self-luminous function.
2Measurement precision
If attempts are made to objectively identify luminance deterioration, then measurement can be performed, but the polyimide substrate charging phenomenon interferes with accurate measurement
Solution Approach 1:
The patent extracts the light emitting layer's degradation effect from the overall luminance change by comparing regions with different emission patterns. By isolating the first region (continuous emission) from the second region (non-continuous emission), the measurement system can separate the polyimide substrate charging phenomenon from the light emitting layer degradation, enabling precise identification of light emission efficiency changes.
3Measurement precision
If a method considering transistor characteristic changes is used, then light emission efficiency can be measured more objectively, but the measurement system becomes more complex
Solution Approach 1:
Different regions of the display panel are assigned different emission characteristics: the first region uses sub-pixels that emit light continuously to accelerate degradation and enable measurement, while the second region uses sub-pixels that do not emit light continuously. This local quality differentiation allows the measurement system to capture transistor characteristic changes and light emission efficiency degradation without requiring complex external measurement equipment, as the display panel itself serves as the measurement platform.
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 method enables the accurate measurement of the display panel's lifespan by isolating the effects of light emission efficiency and polyimide substrate charging, providing a more objective assessment of the panel's performance and durability.
Implementation Method 1
the display device may include a light emitting layer configured to emit light. As light is continuously emitted from the light emitting layer, the light emission efficiency of the light emitting layer may be deteriorated.
Implementation Method 2
the interference of the polyimide substrate charging phenomenon, which complicates the distinction between luminance degradation caused by the substrate and the organic light emitting layer's degradation.
Data Source
AI summary
In a method of measuring a life time of a display panel, pixels each including a first sub-pixel emitting light of a first color are disposed in the display panel. The display panel includes a first region in which at least one pixel including a first sub-pixel emitting light of the first color is located and a second region not overlapping with the first region and having at least one pixel located therein. The method includes a first step in which a first sub-pixel in the first region emits light and a first sub-pixel in the second region does not emit light while the first sub-pixel emits light, and a second step in which a data voltage for displaying an image of the same grayscale is applied to the first sub-pixel located in the first region and the first sub-pixel located in the second region.