Display Panel Through-Hole Coating for Moisture-Resistant Polarizers
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Solution Overview
Problem
Display devices face issues with moisture permeation through optical holes, leading to polarizing film shrinkage and appearance defects, which affect the transmittance and reliability of the display.
Innovation Solution
A display device design that includes a hole coating layer on the inner walls of through holes to prevent moisture permeation, combining a flexible substrate with a thin-film encapsulation layer, polarizing bonding layer, and a transparent bonding layer to cover and protect the polarizing film, while maintaining high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through hole is created in the display panel and polarizing member to allow light reception, then optical element functionality is improved, but moisture permeation increases causing polarizing film shrinkage and appearance defects
Solution Approach 1:
The through hole structure is segmented into multiple functional zones: an upper through hole portion, a lower through hole portion, and a bent connection portion linking them. This segmentation allows the hole to serve optical functions while the bent configuration prevents direct moisture pathways to the polarizing member, resolving the contradiction between optical functionality and moisture protection.
Solution Approach 2:
The bent connection portion acts as an intermediary element between the upper and lower through hole portions. This intermediary structure blocks the direct transmission path for moisture while maintaining optical element functionality, preventing moisture from reaching the polarizing member through the through hole.
2Illumination intensity
If the polarizing member is physically penetrated to increase transmittance, then light transmittance is improved, but the polarizing film becomes exposed to moisture and air
Solution Approach 1:
The through hole structure implements local quality differentiation: the upper portion allows light transmission for optical functionality, while the bent connection portion creates a localized barrier that prevents moisture ingress. This localized structural variation enables simultaneous achievement of high light transmittance and moisture protection at different locations within the same through hole structure.
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
Prevents polarizing film shrinkage and appearance defects, ensuring the display's reliability and maintaining high light transmittance by effectively blocking moisture ingress through the optical holes.
Implementation Method 1
a first through hole which penetrates the display panel and the polarizing member in a thickness direction is defined in the display panel and the polarizing member and the display panel and the polarizing member include a hole coating layer which is disposed on an inner wall of the polarizing member of the first through hole
Data Source
AI summary
A display device includes an active region and a non-active region. The display device includes a display panel and a polarizing member which is disposed on a surface of the display panel, where the display panel and the polarizing member include a first through hole which penetrates the display panel and the polarizing member in a thickness direction and a hole coating layer which is disposed on an inner wall of the polarizing member of the first through hole.