OLED Electrode Incline Structure for Spacer Step Coverage
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Solution Overview
Problem
Current fabrication methods for scaled-down headgear devices, such as VR and AR headsets, face challenges in maintaining the integrity and yield of organic light-emitting diode (OLED) display components due to issues with spacer layer thickness and alignment, leading to potential breakage and reduced display resolution.
Innovation Solution
The design of an OLED display device with a first electrode having an inclined surface and controlled angles between 45 to 80 degrees, along with a spacer layer that covers this surface smoothly, reduces vertical offsets and prevents breakage of the second electrode, enhancing yield and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the second electrode is made thinner to improve flexibility and reduce stress, then the device can be scaled down for headgear applications, but the electrode becomes more prone to breaking and has poor step coverage
Solution Approach 1:
The first electrode is designed with different surface characteristics at different locations: an inclined surface facing the second electrode that provides gradual step coverage, and a bottom surface that ensures proper adhesion to the insulation layer. This local differentiation allows the second electrode to be thin while maintaining reliability through improved step coverage on the inclined surface.
Solution Approach 2:
The first electrode incorporates an inclined surface (angled at 45-80 degrees) instead of a vertical or flat surface. This curved/angled geometry provides gradual step coverage that reduces stress concentration on the thin second electrode, preventing breakage while maintaining the desired thin profile for flexibility.
2Productivity
If the second electrode is made thinner to reduce vertical offset and improve uniformity, then fabrication efficiency improves, but the electrode becomes more susceptible to disconnection
Solution Approach 1:
The inclined surface (45-80 degree angle) of the first electrode creates a gradual transition zone that reduces vertical offset between the first and second electrodes. This curved geometry allows the second electrode to be deposited more uniformly with better step coverage, reducing disconnection risks while maintaining thin profile for efficient fabrication.
Solution Approach 2:
The first electrode's inclined surface provides localized geometric optimization specifically at the interface with the second electrode. This local structural modification ensures that the thin second electrode achieves proper step coverage and adhesion precisely where needed, preventing disconnection while maintaining overall thinness for fabrication efficiency.
3Manufacturing precision
If the first electrode is designed with an inclined surface, then step coverage of the second electrode improves, but the fabrication process becomes more complex
Solution Approach 1:
The inclined surface (45-80 degree angle) of the first electrode is formed using standard photolithography and etching techniques. This geometric feature, while improving step coverage significantly, can be integrated into existing fabrication workflows without requiring complex additional process steps, thus achieving better manufacturing precision with moderate complexity increase.
Solution Approach 2:
The inclined surface is implemented only at specific locations of the first electrode (the surface facing the second electrode), rather than modifying the entire electrode structure. This localized geometric modification achieves improved step coverage where critical while minimizing the overall complexity increase of the fabrication process.
Data Source
AI summary
An organic light emitting diode display includes an integrated circuit, a first electrode, a spacer, an organic material stack layer, and a second electrode. The first electrode is electrically connected to the integrated circuit and has a top surface, a bottom surface, and an inclined surface connecting the top and bottom surfaces. An angle between the inclined surface and the bottom surface is in a range from about 45 degrees to about 80 degrees. The spacer is disposed to cover the inclined surface of the first electrode. The organic material stack layer is disposed on the first electrode. The second electrode is disposed on the organic material stack layer and the spacers.