Encapsulation Layer Nitrogen Gradient for Display Transparency
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Solution Overview
Problem
Existing display devices with low overall transparency make it difficult for users to clearly see the background behind the device, and there is a need to enhance the moisture and oxygen barrier properties of electronic devices and display panels to improve their reliability and lifespan.
Innovation Solution
A package for electronic devices and display panels is designed with a substrate having a device area and a light transmitting area, where the encapsulation layer covers both areas, with a higher nitrogen content on the device area (≥7 atomic percent) to provide improved barrier properties while maintaining high light transmittance in the light transmitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the overall transparency of the display device is increased to improve visibility of the background, then the light transmittance is improved, but the moisture and oxygen barrier properties deteriorate
Solution Approach 1:
The encapsulation layer is designed with spatially varying nitrogen content: the first region (device area) has nitrogen content of 5-15 at% providing superior barrier properties, while the second region (light transmitting area) has nitrogen content of 0-5 at% maintaining high light transmittance. This local differentiation resolves the contradiction by optimizing each region's composition for its specific function.
Solution Approach 2:
The invention changes the chemical composition parameter (nitrogen content) of the encapsulation layer across different spatial regions. By controlling nitrogen concentration to be higher in the device area and lower in the light transmitting area, the material achieves both improved barrier properties where needed and maintained transparency where visibility is critical.
2Reliability
If the nitrogen content of the encapsulation layer is increased to improve moisture and oxygen barrier properties, then the reliability is improved, but the light transmittance deteriorates
Solution Approach 1:
Different nitrogen content levels are applied to different regions: the device area receives high nitrogen content (5-15 at%) for enhanced barrier properties, while the light transmitting area receives low nitrogen content (0-5 at%) for optimal light transmission. This localized quality adjustment resolves the contradiction between reliability and light transmittance.
Solution Approach 2:
The encapsulation layer is segmented into two functional regions with distinct nitrogen content characteristics. The first region covers the device area with high nitrogen content for barrier protection, while the second region covers the light transmitting area with low nitrogen content for optical performance, allowing each segment to optimize its specific function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively enhances the barrier characteristics in the device area while ensuring high light transmittance in the light transmitting area, thereby improving the reliability and visibility of the background behind the display device.
Implementation Method 1
a nitrogen content of the encapsulation layer on the device area is higher than the nitrogen content of the encapsulation layer on the light transmitting area
Data Source
AI summary
A package of electronic device including a substrate, at least one electronic device and an encapsulation layer is provided. The substrate has a device area and a light transmitting area located outside the device area. The at least one electronic device is disposed on the device area of the substrate. The encapsulation layer is disposed on the substrate and covers the at least one electronic device. The encapsulation layer extends continuously from the device area to the light transmitting area, and a nitrogen content of the encapsulation layer on the device area is higher than a nitrogen content of the encapsulation layer on the light transmitting area. A display panel is also provided.