Flexible Display Polarization Member for Bend-Induced Color Shift
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Solution Overview
Problem
Flexible display devices face deterioration in display quality due to stress applied when bent or folded, leading to issues with color shift and reflectance variation as viewing angles change.
Innovation Solution
A flexible display device incorporating a polarization member with a λ/4 phase retardation layer and a λ/2 phase retardation layer, both having liquid crystal coating layers, along with specific adhesion members and a line polarizer, is designed. The λ/4 phase retardation layer has a positive phase retardation value, and the λ/2 phase retardation layer has a negative phase retardation value, with the adhesion members having tailored glass transition temperatures and thicknesses to enhance durability and bendability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made flexible and bendable, then portability and adaptability are improved, but display quality deteriorates due to stress-induced color shift and reflectance variation
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the glass transition temperatures of the adhesion members. The first adhesion member has a glass transition temperature of 40°C to 150°C, while the second adhesion member has a glass transition temperature of -35°C to 0°C. This parameter optimization allows the polarization member to maintain its optical properties and structural integrity when bent, thereby improving display quality while preserving flexibility
Solution Approach 2:
The patent uses composite materials by combining different liquid crystal materials (nematic and discotic) with specific adhesion members having different glass transition temperatures. This composite structure creates a polarization member that can withstand bending stress while maintaining display quality, resolving the contradiction between flexibility and reliability
2Manufacturing precision
If the polarization member uses traditional rigid structure, then manufacturing precision is improved, but ease of operation deteriorates due to inability to bend without display quality loss
Solution Approach 1:
The patent changes the physical parameters of the adhesion members by selecting materials with specific glass transition temperatures. The first adhesion member (40°C to 150°C) and second adhesion member (-35°C to 0°C) are chosen to provide appropriate flexibility at operating temperatures while maintaining structural precision during manufacturing
Solution Approach 2:
The patent implements flexible shells and thin films by using thin adhesion member layers (0.1 to 5 micrometers for the first adhesion member) that allow the polarization member to bend without compromising manufacturing precision or display quality
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
This configuration reduces color shift and reflectance variation across different viewing angles, maintaining display quality even when the device is bent or folded, by offsetting phase differences and improving molecular bonding resistance.
Implementation Method 1
a λ/4 phase retardation layer disposed on the flexible display module and including a nematic liquid crystal coating layer, a first adhesion member disposed on the λ/4 phase retardation layer, a λ/2 phase retardation layer disposed on the first adhesion member and including a discotic liquid crystal coating layer
Implementation Method 2
the adhesion members having tailored glass transition temperatures and thicknesses to enhance durability and bendability
Data Source
AI summary
A flexible display device includes a display module including a bending area that is bendable along a reference axis, and a polarization member disposed on the display module. The polarization member includes a λ/4 phase retardation layer disposed on the display module and including a nematic liquid crystal coating layer. The polarization member further includes a first adhesion member disposed on the λ/4 phase retardation layer, a λ/2 phase retardation layer disposed on the first adhesion member and including a discotic liquid crystal coating layer, a second adhesion member disposed on the λ/2 phase retardation layer, and a line polarizer disposed on the second adhesion member and including an absorption axis, wherein an angle between the reference axis and the absorption axis is about 15 degrees to about 75 degrees.