OLED Repair via Reverse Voltage Electrolysis
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Solution Overview
Problem
Organic light emitting devices are prone to short circuit defects due to pinholes, cracks, or uneven thickness in the organic material layer, leading to reduced light output and display quality issues, which conventional manufacturing methods in clean rooms cannot effectively address.
Innovation Solution
The use of a metal electrode with Ag, including an exposure portion where the organic material layer or bottom electrode is exposed, allowing for the application of a reverse voltage to remove short circuit defect regions and form an exposure portion, thereby preventing leakage currents and enhancing device efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the organic material layer is increased to prevent short circuit defects, then the reliability of the device is improved, but the manufacturing cost increases and the device cannot completely remove short circuit defects
Solution Approach 1:
The patent applies reverse voltage before the device is fully operational to proactively remove short circuit defects. By performing this action during the manufacturing process rather than after, the device can operate at optimal thickness without excessive material usage, reducing manufacturing costs while ensuring reliability.
Solution Approach 2:
The patent changes the electrical parameter by applying reverse voltage to alter the state of the organic material layer. This parameter change enables the removal of short circuit defects without requiring increased material thickness, thus avoiding additional manufacturing costs while maintaining reliability.
2Reliability
If the interval between anode and cathode is increased to decrease short circuit defects, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The reverse voltage treatment is applied during the manufacturing process as a preliminary action to eliminate short circuit defects. This allows the device to maintain optimal electrode spacing without requiring increased intervals, thereby reducing manufacturing costs while ensuring reliability.
3Reliability
If reverse voltage is applied to remove short circuit defect regions, then the device performance is improved and leakage currents are reduced, but additional processing steps are required
Solution Approach 1:
The reverse voltage treatment serves multiple functions: it removes short circuit defects, reduces leakage currents, and improves overall device performance. By combining these functions into a single processing step, the patent minimizes the increase in device complexity while achieving significant performance improvements.
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 effectively minimizes performance degradation and extends the lifetime of organic light emitting devices by removing short circuit defects and reducing leakage currents, while also providing a simple repair process for such devices.
Implementation Method 1
applying a reverse voltage to remove one or more regions of the top electrode including a short circuit defect region
Implementation Method 2
when a voltage is applied between the anode and the cathode, the anode injects a hole into the organic material layer, and the cathode injects an electron into the organic material layer. The hole and the electron which are injected into the organic material layer are combined to generate an exciton, and when the exciton is shifted to a ground state, light is emitted.
Data Source
AI summary
One embodiment of the present invention relates to an organic light emitting diode, a method for manufacturing an organic light emitting diode, and a method for repairing an organic light emitting diode, the light emitting diode comprising at least one exposed part on an upper electrode which exposes an organic layer or a lower electrode, wherein the light emitting diode effectively prevents performance deterioration or operation failure of the light emitting diode due to leakage current by removing an electrical passage in an area prone to short circuit flaws.