Electroluminescence Display Aging Signal Voltage Swing
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Solution Overview
Problem
Organic light-emitting displays face defects due to short-circuits between the anode and cathode caused by impurities, leading to dark defects and a need for enhanced aging processes to improve product reliability and yield.
Innovation Solution
An electroluminescence display with a power supply part that outputs a drive voltage and applies an externally generated aging signal to the cathode, maximizing the voltage swing range for effective aging, thereby eliminating defects and enhancing aging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an aging process is carried out by applying constant voltage to eliminate short-circuit defects, then product reliability is improved, but the voltage swing range is limited and aging performance cannot be further enhanced
Solution Approach 1:
The patent applies dynamics by transitioning from static constant voltage aging to dynamic voltage aging. The aging signal voltage dynamically changes over time with a specific waveform pattern, allowing the voltage to swing between different levels (including reverse bias conditions) to effectively eliminate defects while enhancing aging performance beyond what constant voltage can achieve.
Solution Approach 2:
The patent employs parameter changes by modifying the voltage parameter during the aging process. Instead of maintaining a fixed voltage level, the aging signal voltage varies according to a defined waveform, changing between forward bias and reverse bias conditions. This parameter variation enables more comprehensive defect elimination and improves aging effectiveness.
2Ease of manufacture
If impurities are present between anode and cathode, then manufacturing is simplified, but short-circuit defects occur leading to dark defects
Solution Approach 1:
The patent applies preliminary action by implementing an enhanced aging process before the display product is shipped to customers. The aging signal is applied in advance to eliminate potential short-circuit defects caused by impurities, ensuring that defects are removed before the product reaches the end user, thereby maintaining manufacturing simplicity while improving reliability.
Solution Approach 2:
The patent converts the harmful effect of impurities into a beneficial aging process. By applying reverse bias voltage through the dynamic aging signal, the impurities that cause short-circuits are actually utilized to create detectable leakage currents that can be measured and eliminated, transforming a manufacturing defect into a controllable aging parameter.
3Ease of operation
If constant voltage is applied during aging, then the aging process is simple to implement, but aging performance is limited and cannot be further enhanced
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic aging signal with a specific waveform that varies voltage over time. The signal transitions between different voltage levels including reverse bias conditions, maintaining ease of implementation through automated signal generation while significantly enhancing aging performance compared to static constant voltage methods.
Solution Approach 2:
The patent applies periodic action through the oscillating waveform of the aging signal. The voltage periodically swings between forward bias and reverse bias conditions, creating cyclic stress that effectively eliminates defects over time. This periodic variation maintains operational simplicity while dramatically improving aging effectiveness over constant voltage methods.
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
The solution effectively extends the range of applicable aging signals, ensuring reliable operation by separating impurities and preventing short-circuits, thus improving product reliability and yield.
Implementation Method 1
an organic light-emitting element that emits light by a drive current controlled by a plurality of transistors and the drive transistor
Implementation Method 2
an externally applied aging signal is applied to a cathode of the electroluminescence element to perform aging on the display panel... separating impurities and preventing short-circuits
Data Source
AI summary
An electroluminescence display and a method for driving the same are provided to enhance the aging performance of the electroluminescence display. The electroluminescence display comprises: a display panel on which a plurality of pixels each comprising an electroluminescence element; and a power supply part that outputs a drive voltage for driving the pixels, wherein an externally applied aging signal is applied to a cathode of the electroluminescence element to perform aging on the display panel.