Optical Film with High Modulus Adhesives for Flexible Displays
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Solution Overview
Problem
Current optical films used in display devices have weak durability and thickness issues, which can lead to damage when bent or folded, and hinder the development of thinner display devices.
Innovation Solution
An optical film comprising a polarization film made of polyolefin and dichroic dye, with thin phase delay layers and adhesives having a high storage modulus, which improves durability and reduces thickness, preventing external light reflection and enhancing display device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical film is made thinner to enable thinner display devices, then the thickness is reduced, but the durability and resistance to damage during bending or folding deteriorate
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different functions: a polarization film layer, a first phase delay layer with first adhesive, and a second phase delay layer with second adhesive. This multi-layer composite structure achieves both thinness and durability by distributing mechanical stress across different materials with complementary properties, preventing damage during bending while maintaining overall thin profile.
Solution Approach 2:
The patent utilizes flexible thin films by selecting materials with appropriate mechanical properties for each layer. The phase delay layers and adhesives are specifically chosen to provide flexibility and bendability, allowing the optical film to be thin yet resistant to damage during folding or bending operations in display devices.
2Ease of manufacture
If conventional adhesives are used in the optical film, then the manufacturing is easier, but the durability at bent or folded locations deteriorates due to low storage modulus
Solution Approach 1:
The patent applies parameter changes by specifically controlling the storage modulus of the adhesives to be greater than or equal to 0.2 MPa at room temperature and 10 Hz frequency. This parameter optimization ensures the adhesive maintains sufficient rigidity to prevent damage at bent locations while still allowing for practical manufacturing and assembly processes.
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 optical film achieves improved durability and reduced thickness, effectively preventing light reflection and enhancing display device performance, making it suitable for flexible and thin display applications.
Implementation Method 1
a polarization film including a polyolefin and a dichroic dye
Implementation Method 2
a polarization film including a polyolefin and a dichroic dye
Implementation Method 3
a first phase delay layer positioned on the polarization film and including a liquid crystal, a second phase delay layer positioned on the first phase delay layer and including a liquid crystal
Data Source
AI summary
An optical film includes a polarization film including a polyolefin and a dichroic dye, a first phase delay layer positioned on one side of the polarization film and including a liquid crystal, a second phase delay layer positioned on one side of the first phase delay layer and including a liquid crystal, a first adhesive between the polarization film and the first phase delay layer, and a second adhesive between the first phase delay layer and the second phase delay layer, wherein at least one of the first adhesive and the second adhesive has a room temperature storage modulus of greater than or equal to about 0.2 MPa at a frequency of 10 Hz, and a display device including the same, are provided.