Optical Laminate Light Blocking Layer Foldability
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Solution Overview
Problem
Existing optical laminate technologies face challenges in achieving excellent processability, cost reduction, foldability, and simultaneous high adhesiveness and reworkability, particularly in the formation of light blocking layers for display devices, which often result in defects and increased costs due to print flow patterns and stress issues during folding.
Innovation Solution
An optical laminate design featuring a second adhesive layer, a first adhesive layer, and a light blocking part between them, where the light blocking layer can be formed at the edge of either adhesive layer, with controlled storage modulus and peel strength properties, and optionally including protective layers, to enhance foldability and adhesiveness while reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light blocking layer is formed on a base film in a roll-to-roll manner, then productivity is improved, but manufacturing precision deteriorates due to print flow patterns and print smearing
Solution Approach 1:
The patent divides the light blocking layer formation into multiple stages: first forming a composition layer on the base film, then applying a separate adhesive layer on top. This segmentation allows the composition layer to be optimized for print quality while the adhesive layer handles bonding, resolving the conflict between productivity and manufacturing precision.
Solution Approach 2:
The patent introduces an intermediary adhesive layer between the light blocking composition and the window film. This intermediary layer acts as a mediator that prevents direct contact issues between the composition and the window film, reducing print defects while maintaining efficient roll-to-roll production.
2Strength
If surface treatment is applied to the base film to increase adhesion, then adhesiveness is improved, but device complexity increases due to additional process steps
Solution Approach 1:
The patent changes the chemical parameters of the adhesive layer by selecting specific adhesive materials with appropriate viscosity and curing characteristics. This allows the adhesive layer itself to provide sufficient adhesion without requiring surface treatment of the base film, thus improving adhesion strength while keeping the process simple.
3Reliability
If the window film and optical adhesive film are laminated to improve foldability, then reliability is improved, but manufacturing precision deteriorates due to stress during folding
Solution Approach 1:
The patent creates a composite structure where the adhesive layer is formulated with specific material properties (viscosity, elasticity) that allow it to accommodate folding stresses. This composite approach enables the window film assembly to achieve excellent foldability while maintaining manufacturing precision by preventing stress-related defects through proper material selection.
Data Source
AI summary
Provided are: an optical laminate comprising a second adhesive layer, a second adhesive layer laminated on the second adhesive layer, and a light shield part laminated between the first adhesive layer and the second adhesive layer; an optical member comprising same; and an optical display device including same.