Polarizing Plate Void Portion for Crack Prevention
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Solution Overview
Problem
Polarizing plates used in non-rectangular shapes and with through-holes, such as in automobile meter displays, face durability issues due to stress concentration at the boundaries between the polarizer and protective films, leading to cracks.
Innovation Solution
A polarizing plate design featuring a polarizer with a void portion formed by positioning the polarizer's end surface inward relative to the protective films' end surfaces, along with through-holes and specific edge shapes, and a production method involving laser cutting and treatment with a liquid to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the polarizing plate is formed into a non-rectangular shape or with through-holes, then the adaptability to different display applications is improved, but the durability deteriorates due to stress concentration at boundaries
Solution Approach 1:
The invention applies local quality by creating a polarizer void portion at specific locations (end portions of the polarizer) where stress concentration occurs. This void portion locally modifies the structure to reduce stress concentration at the boundaries between the polarizer and protective films, thereby improving durability without affecting the overall non-rectangular shape or through-holes of the polarizing plate.
2Manufacturing precision
If the end surface of the polarizer is positioned flush with the protective films, then the manufacturing precision is improved, but the durability deteriorates due to stress concentration
Solution Approach 1:
The invention deviates from flush alignment at specific locations by creating a polarizer void portion at the end portions of the polarizer. This local structural modification positions the polarizer end surface inward relative to the protective film end surfaces, reducing stress concentration while maintaining overall manufacturing precision for the majority of the polarizing plate.
Solution Approach 2:
The polarizer void portion acts as a pre-designed stress relief structure that cushions against stress concentration before it can cause cracks. By anticipating stress concentration at the boundaries and incorporating the void portion in advance, the invention prevents durability issues before they occur.
3Reliability
If a polarizer void portion is formed by positioning the end surface inward, then the durability is improved by reducing stress concentration, but the manufacturing complexity increases
Solution Approach 1:
The invention incorporates the polarizer void portion formation into the preliminary stages of polarizing plate manufacturing. By designing the void portion to be created during the lamination or cutting process rather than as a separate post-processing step, the manufacturing complexity is minimized while still achieving the durability improvement.
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 polarizing plate exhibits significantly improved durability by relaxing stress concentrations and preventing crack formation, particularly at the edges of through-holes and absorption axis directions, while maintaining external appearance and bonding integrity.
Implementation Method 1
the cutting and/or the punching processing is performed by laser light irradiation
Implementation Method 2
the polarizing plate has a polarizer void portion formed by positioning of an end surface of the polarizer inward in a plane direction relative to each of end surfaces of the protective films
Data Source
AI summary
There is provided a polarizing plate excellent in durability. A polarizing plate 100 according to one embodiment of the present invention includes a polarizer 10; and a pair of protective films 21, 22 respectively arranged on both main surfaces of the polarizer 10, wherein the polarizing plate 100 has a polarizer void portion 30 formed by positioning of an end surface 10a of the polarizer 10 inward in a plane direction relative to each of end surfaces 21a, 22a of the protective films 21, 22.