Optical Laminate Rubber Particles Antiglare Layer
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Solution Overview
Problem
Cellulose ester-based films used in polarizer protective optical films have high water permeability and poor water resistance, leading to light leakage and mechanical durability issues in liquid crystal display devices.
Innovation Solution
An optical laminate comprising a polymer substrate with rubber particles and an antiglare layer containing organic or inorganic fine particles, where the rubber particles are strategically positioned within a specific thickness range of the antiglare layer to enhance scratch resistance and optical properties, such as high contrast ratio and image sharpness, while maintaining low haze values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a cellulose ester-based film is used as a light-transmissive substrate film, then transparency and optical isotropy are improved, but water resistance deteriorates
Solution Approach 1:
The patent uses a polymer substrate composite material consisting of a polymer resin matrix combined with rubber particles having specific cross-sectional dimensions (10 to 500 nm). This composite structure provides both optical transparency and enhanced water resistance, resolving the contradiction between these two properties. The rubber particles dispersed in the polymer resin create a material that maintains light transmission while blocking water vapor permeation.
2Strength
If a hard coating layer is applied on the polarizer to prevent damage, then mechanical strength is improved, but scratch resistance deteriorates
Solution Approach 1:
The patent changes the physical parameters of the protective layer by incorporating rubber particles with specific cross-sectional dimensions (10 to 500 nm) into the polymer substrate. This parameter change enables the material to achieve both mechanical strength and scratch resistance simultaneously, as the rubber particles provide toughness and resistance to scratching while maintaining the structural integrity needed for mechanical strength.
3Reliability
If water permeability is reduced to prevent light leakage, then reliability is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent employs a composite material system where rubber particles (10 to 500 nm cross-section) are dispersed within a polymer resin matrix. This composite structure simultaneously achieves low water vapor permeation rates (improved reliability) and maintains excellent mechanical properties including scratch resistance and wear resistance. The rubber particles provide both water blocking capability and mechanical toughness.
Data Source
AI summary
The present disclosure provides an optical laminate including a polymer substrate and an antiglare layer, wherein rubber particles having a cross-sectional diameter of 10 to 500 nm exist within 50% of the thickness of the antiglare layer from the interface between the polymer substrate and the antiglare layer, a polarizing plate including the optical laminate, and a liquid crystal display and a display device including the polarizing plate.