Display Device Protective Layer for Low-Refractive-Index Moisture Protection
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Solution Overview
Problem
Display devices face reliability issues due to moisture ingress through the low refractive index layer, which can lead to defects.
Innovation Solution
Incorporating a protective layer made of inorganic material around the low refractive index layer and a barrier layer to prevent moisture ingress, along with spacing the color filter layer from the sealing member to minimize exposure to external moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the low refractive index layer is used to improve light extraction efficiency, then display quality is improved, but moisture ingress through this layer causes reliability issues
Solution Approach 1:
A protective layer is introduced as an intermediary component between the low refractive index layer and the external environment. This protective layer specifically prevents moisture ingress through the low refractive index layer while maintaining its light extraction function, thus resolving the contradiction between improved illumination and reduced moisture resistance
Solution Approach 2:
The display device employs a composite structure combining the low refractive index layer with the protective layer. The protective layer is made of materials with low moisture permeability, creating a composite system that simultaneously achieves high light extraction efficiency and effective moisture barrier properties
2Device complexity
If the color filter layer is positioned close to the sealing member for compact design, then device complexity is reduced, but exposure to external moisture increases
Solution Approach 1:
The protective layer serves as a mediator that extends coverage to the color filter layer. By positioning the protective layer to cover the color filter layer in the vertical stacking direction, it creates a moisture barrier without requiring complex lateral sealing structures, thus maintaining structural simplicity while reducing moisture exposure
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
Enhances the reliability of the display device by preventing moisture from entering through the low refractive index layer and reducing the risk of defects.
Implementation Method 1
a protective layer covering the low refractive index layer, surrounding a side surface of the low refractive index layer, and including an inorganic material
Implementation Method 2
a low refractive index layer under the color filter layer, overlapping with the first area, and spaced from the sealing member
Data Source
AI summary
A display device includes: a first substrate including a first area, a second area surrounding the first area, and a third area surrounding the second area; a second substrate facing the first substrate; a sealing member between the first substrate and the second substrate at the third area; a color filter layer under the second substrate; a low refractive index layer under the color filter layer, overlapping with the first area, and spaced from the sealing member; a protective layer covering the low refractive index layer, surrounding a side surface of the low refractive index layer, and including an inorganic material; and a color conversion layer under the protective layer, overlapping with the first area, and including a plurality of color conversion parts spaced from each other.