Porous Frit Layer for OLED Moisture and Strain Management
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Solution Overview
Problem
Organic light emitting diode displays are sensitive to moisture, which affects their performance and service life, and existing solutions fail to provide effective moisture resistance while maintaining structural integrity under strain.
Innovation Solution
A 'loose-dense-loose' structured frit layer with specific pore distributions in an organic light emitting diode display, comprising a first porous region with larger pores and a second porous region with smaller pores, located between the first and third porous regions, enhances both moisture resistance and strain release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dense frit layer is used to achieve moisture resistance, then moisture resistance is improved, but strain release capability deteriorates
Solution Approach 1:
The frit layer is designed with a porous structure containing multiple pores distributed throughout its thickness. These pores allow the frit layer to release strain effectively while maintaining adequate moisture resistance, resolving the contradiction between density for moisture protection and porosity for strain release.
Solution Approach 2:
The frit layer exhibits non-uniform pore distribution with different pore densities in different regions. The first region (near organic light emitting diodes) has a first pore density, while the second region (peripheral area) has a second pore density different from the first. This local variation optimizes both moisture resistance and strain release in different functional zones.
2Strength
If the frit layer is made porous to release strain, then strain release capability is improved, but moisture resistance deteriorates
Solution Approach 1:
The frit layer is designed with a porous structure containing multiple pores distributed throughout its thickness. These pores allow the frit layer to release strain effectively while maintaining adequate moisture resistance, resolving the contradiction between density for moisture protection and porosity for strain release.
Solution Approach 2:
The patent specifies precise pore diameter ranges (4-15 μm) and pore density variations across different regions. By controlling these parameters, the frit layer achieves optimal balance between strain release (requiring porosity) and moisture resistance (requiring density).
3Ease of manufacture
If a uniform pore distribution is used in the frit layer, then manufacturing simplicity is improved, but performance optimization deteriorates
Solution Approach 1:
The frit layer exhibits non-uniform pore distribution with different pore densities in different regions. The first region (near organic light emitting diodes) has a first pore density, while the second region (peripheral area) has a second pore density different from the first. This local variation optimizes both moisture resistance and strain release in different functional zones.
Data Source
AI summary
An organic light emitting diode display and a manufacturing method thereof are provided. The organic light emitting diode display includes a first substrate, a second substrate, a plurality of organic light emitting diodes, and a frit layer. The organic light emitting diodes are disposed on the first substrate, and the frit layer adheres the first substrate and the second substrate to each other. The frit layer includes a first porous region having pores, a second porous region having pores, and a third porous region having pores. The number of the pores of the first porous region with a diameter of larger than or equal to 4 μm and smaller than or equal to 15 μm is greater than the number of the pores of the second porous region with the above-mentioned diameter range.