Organic Light Emitting Display Electrode Surface Evenness
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in maintaining consistent light transmittance and surface evenness due to variations in electrode thickness and material agglomeration, leading to degraded display characteristics.
Innovation Solution
The organic light emitting display apparatus features a substrate with an organic layer having concave and convex portions, and electrodes with corresponding surface features, where the vertical distance between these features is minimized to reduce thickness deviations and improve surface evenness, thereby maintaining consistent light transmittance and enhancing display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the electrode thickness is increased to improve light blocking, then the light transmittance decreases, but the manufacturing complexity and surface evenness deteriorate
Solution Approach 1:
The electrode is divided into multiple layers with different thicknesses and materials. The first electrode includes a first sub-electrode and a second sub-electrode with different optical properties, allowing selective light management in different regions or wavelengths, thereby maintaining light transmittance while achieving sufficient light blocking where needed
Solution Approach 2:
Different regions of the electrode structure have different thicknesses and material compositions optimized for their specific functions. The first and second sub-electrodes have different properties tailored to their respective roles in light transmission and blocking, avoiding uniform thickness that would compromise either transmittance or surface evenness
2Illumination intensity
If the electrode thickness is varied to improve light blocking, then the light transmittance control improves, but the manufacturing precision and transmittance consistency worsen
Solution Approach 1:
The electrode is segmented into multiple sub-electrodes with controlled thickness variations. This segmentation allows independent optimization of light blocking in specific regions while maintaining consistent transmittance in other regions, resolving the contradiction between light blocking control and transmittance consistency
Solution Approach 2:
The electrode structure incorporates dynamic light management capabilities through its multi-layer design, where each sub-electrode can be independently optimized for different light control requirements, enabling adaptive light blocking while maintaining overall transmittance consistency across the display
3Ease of manufacture
If material agglomeration occurs during deposition, then the electrode formation becomes simpler, but the surface evenness and display characteristics worsen
Solution Approach 1:
The electrode formation process is segmented into multiple deposition steps creating separate sub-electrodes. This segmentation prevents material agglomeration that would occur in single-step deposition, as each sub-electrode can be deposited with controlled thickness and uniform distribution, maintaining surface evenness while simplifying the overall manufacturing process
Solution Approach 2:
The first sub-electrode is deposited as a preliminary layer before the second sub-electrode. This preliminary action creates a foundation that prevents subsequent material agglomeration, ensuring surface evenness is maintained throughout the electrode formation process while keeping the manufacturing steps manageable
Data Source
AI summary
An organic light emitting display apparatus includes a substrate, an organic layer on the substrate, wherein the organic layer includes a first concave portion and a first convex portion on a surface thereof, a first electrode on the organic layer, wherein the first electrode includes a second concave portion and a second convex portion on a surface thereof, a second electrode on the first electrode, and an emission layer between the first and second electrodes. A vertical distance between the second concave portion and the second convex portion is less than that between the first concave portion and the first convex portion.