Organic Light Emitting Device Mesh Electrode Short Circuit Management
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Solution Overview
Problem
Organic light emitting devices are prone to short circuit defects due to structural irregularities and roughness, leading to reduced emission efficiency and display quality, with conventional methods increasing manufacturing costs without fully addressing the issue.
Innovation Solution
Incorporating a mesh-structured secondary electrode with a high sheet resistance first electrode to manage leakage current and maintain normal operation even with short circuit defects, by ensuring the sheet resistance of the first electrode is 5,000 Ω/□ or more and the multiplication of the sheet resistance and pixel area is 3,200 V cm² or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interval between anode and cathode is increased to prevent short circuit defects, then reliability improves, but organic layer thickness increases beyond necessary levels causing manufacturing cost increase
Solution Approach 1:
A secondary electrode with mesh structure is introduced as an intermediary component between the anode and cathode. This mesh electrode acts as a mediator that collects and redistributes current, preventing direct short circuits while maintaining appropriate organic layer thickness for cost-effective manufacturing.
Solution Approach 2:
The sheet resistance of the first electrode is optimized to 5,000 Ω/□ or more, and the multiplication of sheet resistance and pixel area is controlled to 3,200 V cm² or less. These parameter changes enable the electrode structure to manage leakage current effectively without requiring increased device thickness.
2Ease of manufacture
If conventional manufacturing methods are used in clear chamber, then manufacturing cost is reduced, but short circuit defects are not effectively removed
Solution Approach 1:
The mesh-structured secondary electrode is designed beforehand to compensate for potential short circuit defects. By providing alternative current pathways through the mesh structure, the system cushions against the harmful effects of short circuits that may occur during manufacturing in clear chamber environments.
3Reliability
If mesh-structured secondary electrode is added to manage leakage current, then reliability improves, but device complexity increases
Solution Approach 1:
The secondary electrode is segmented into a mesh structure with multiple discrete conductive elements spaced throughout the device. This segmentation allows the complex function of leakage current management to be achieved through simple, repetitive geometric patterns rather than complex continuous structures.
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 stabilizes the operation of organic light emitting devices with short circuit defects, preventing significant luminance reduction and maintaining efficient light emission without increasing leakage current, thus enhancing display quality and reducing manufacturing costs.
Implementation Method 1
a first electrode, a second electrode provided opposite to the first electrode, a one or more-layered organic material layer including an emission layer provided between the first electrode and the second electrode
Implementation Method 2
An organic light emitting phenomenon denotes a phenomenon where electrical energy is converted into light energy by using an organic material. 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
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AI summary
Disclosed is an organic light emitting device.