OLED Pixel Electrode Groove for Uniform Emission Layer
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Solution Overview
Problem
In organic light emitting devices, forming a uniform emission layer is challenging due to surface tension issues, leading to potential leakage currents and luminance deviations.
Innovation Solution
The device incorporates a substrate with a first pixel electrode, a second pixel electrode featuring a groove, a partition overlapping the groove to create a gap, and an organic light emitting member positioned within this gap, along with a common electrode on the partition and organic light emitting member, facilitating uniform emission layer formation and preventing leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the emission layer is formed using conventional methods, then the manufacturing process is simple, but the emission layer cannot be uniformly formed due to surface tension issues
Solution Approach 1:
The second pixel electrode is divided into multiple regions by forming grooves that expose the first pixel electrode. This segmentation creates distinct areas with different electrical characteristics, allowing the emission layer to be uniformly formed across different regions while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the pixel electrode structure are given different properties: the first pixel electrode provides a base layer, the second pixel electrode provides overhang coverage, and the grooves create exposed regions. This local differentiation of properties enables uniform emission layer formation without requiring complex overall restructuring.
2Reliability
If the emission layer is not uniformly formed, then the manufacturing process is simpler, but leakage current is generated
Solution Approach 1:
The grooves are formed in advance during the electrode fabrication process, creating predetermined exposure regions before the emission layer is deposited. This preliminary structuring ensures that the emission layer will be uniformly formed and properly covered in subsequent steps, preventing leakage current without requiring complex post-processing.
Solution Approach 2:
The groove structure acts as an intermediary element between the first and second pixel electrodes. It creates controlled exposure regions that mediate the formation of the emission layer, ensuring uniform coverage and proper electrical isolation to prevent leakage current.
3Illumination intensity
If the emission layer does not cover the electrodes properly, then the device structure is simpler, but luminance deviation occurs
Solution Approach 1:
The pixel electrode is segmented into covered regions (by the second pixel electrode) and exposed regions (through grooves), creating distinct zones that guide uniform emission layer formation. This segmentation ensures proper luminance consistency without requiring overly complex electrode configurations.
Solution Approach 2:
Different local regions of the pixel electrode structure provide different functions: some areas provide overhang coverage while others create exposed regions through grooves. This local quality differentiation ensures the emission layer covers electrodes properly for consistent luminance while maintaining overall structural simplicity.
Data Source
AI summary
The present invention relates to an organic light emitting device including a substrate, a first pixel electrode disposed on the substrate, a second pixel electrode disposed on the first pixel electrode and having a groove, a partition disposed on the second pixel electrode and having an opening exposing the groove, an organic light emitting member, and a common electrode disposed on the partition and the organic light emitting member. At least a portion of the organic light emitting member is disposed in the groove. The partition overlaps the groove to form a gap, and at least a portion of the organic light emitting member is disposed in the gap.