Wire Grid Polarizer Protective Layer Openings for Outgassing Control
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Solution Overview
Problem
Conventional polarizing elements in display devices, such as LCDs, face issues with heat resistance and degradation due to ultraviolet light, and outgassing during manufacturing can contaminate the liquid crystal layer, reducing the reliability of the display device.
Innovation Solution
A display device design featuring a first and second polarizing element with linear patterns separated by gaps, where the polarizing elements are protected by a protective layer with openings that allow gas release, reducing outgassing and enhancing reliability by maintaining a vacuum environment during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is formed on the wire grid polarizer to protect the metallic linear patterns, then the polarizing element is protected, but gas such as air may exist in the space between the metallic linear patterns and the protective layer, causing outgassing during manufacturing
Solution Approach 1:
The protective layer is designed with openings that penetrate through it, creating a porous structure that allows gas to escape. This resolves the contradiction by maintaining the protective function while eliminating the harmful outgassing effect during manufacturing processes.
Solution Approach 2:
The harmful gas trapped between the metallic linear patterns and the protective layer is extracted through the openings in the protective layer. This allows the gas to be removed from the sealed space, preventing outgassing issues during manufacturing while maintaining the protective function.
2Ease of manufacture
If conventional polarizing plates are used in LCDs, then the display device can be manufactured, but the polarizing plate does not have high heat resistance and is degraded by ultraviolet light
Solution Approach 1:
The conventional organic polarizing plate is replaced with a wire grid polarizer consisting of metallic linear patterns. This substitution replaces the material-based polarization mechanism with a structural/metallic-based mechanism, achieving superior heat resistance and UV resistance while maintaining the polarization function necessary for LCD operation.
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 improves the heat resistance and reliability of the display device by preventing contamination from outgassing and maintaining a vacuum environment, thus enhancing the display's performance and longevity.
Implementation Method 1
A polarization component of a polarization direction perpendicular to a direction (lengthwise direction) in which the metallic linear patterns extend transmits through the wire grid polarizer, and a polarization component of a polarization direction parallel to the lengthwise direction of the metallic linear patterns is reflected by the wire grid polarizer.
Implementation Method 2
maintaining a vacuum environment during bonding
Data Source
AI summary
A display device includes a display area and a seal area which surrounds the display area. The display device includes a first display substrate, a second display substrate facing the first display substrate; and a sealant disposed between the first display substrate and the second display substrate, in the seal area. The first display substrate has a first base substrate, a first polarizing element including a plurality of first linear patterns extending along a first direction on the first base substrate, and a first protective layer on the first polarizing element and including a first opening. The sealant covers the first opening. Adjacent first linear patterns are separated from each other along a second direction, intersecting the first direction, by a first gap and the first opening exposes at least one first gap in the seal area.