Color Conversion Substrate With Graded Low-Refractive Edge Layer
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Solution Overview
Problem
Existing display devices face issues with reliability due to the intrusion of external materials through the low refractive layer, leading to defects and reduced performance.
Innovation Solution
A color conversion substrate design with a low refractive layer that increases in thickness from the outer to inner areas, combined with a protective layer to cover and expose minimal side surfaces, preventing material intrusion and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a low refractive layer is used in display devices, then light extraction efficiency is improved, but external materials can intrude through the layer causing defects
Solution Approach 1:
The low refractive layer is designed with non-uniform thickness, being thicker at the edges and thinner at the center. This local variation in thickness provides enhanced protection at the edges where material intrusion is most likely to occur, while maintaining optimal optical performance in the center region.
Solution Approach 2:
The patent introduces a thickness dimension variation to the low refractive layer, transitioning from a uniform thin layer to a graded thickness structure. This adds a vertical dimensional component to the protection mechanism, creating a barrier that increases in height toward the edges to prevent material intrusion.
2Reliability
If the low refractive layer is made thicker to prevent material intrusion, then reliability is improved, but light extraction efficiency may be compromised
Solution Approach 1:
Different regions of the low refractive layer have different thicknesses optimized for their specific functions: the edge regions are thicker to prevent material intrusion, while the center region is thinner to maintain light extraction efficiency. This local optimization resolves the contradiction between protection and optical performance.
Solution Approach 2:
The low refractive layer provides excessive thickness (enhanced protection) only where needed at the edges, rather than uniformly throughout the entire layer. This partial application of the protective function maintains overall light extraction efficiency while providing sufficient protection against material intrusion.
3Reliability
If a protective layer is added to cover the low refractive layer, then material intrusion is prevented, but device complexity increases
Solution Approach 1:
The low refractive layer itself is designed to serve dual functions: maintaining light extraction efficiency in its primary optical role, and preventing material intrusion through its graded thickness structure. This multi-functionality eliminates the need for a separate protective layer, reducing device complexity.
Solution Approach 2:
The protective function is merged into the low refractive layer by varying its thickness, rather than adding a separate protective layer. This consolidation of functions reduces the total number of layers and simplifies the device structure while maintaining protection against material intrusion.
Data Source
AI summary
A color conversion substrate, a display device including the color conversion substrate, and a method of manufacturing the color conversion substrate are provided. The color conversion substrate includes: a first base substrate including a first area, a second area around the first area, and a third area around the second area; a sealing member on the first base substrate and in the second area; a color filter layer on the first base substrate and under the sealing member; and a low refractive layer on the color filter layer, under the sealing member, and increasing in thickness from the third area to the second area in at least a portion of the third area.