Foldable Display Polarizer Coating for UV Color Shift Prevention
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Solution Overview
Problem
Foldable display devices without UV blocking functions suffer from color shift due to UV exposure, and existing designs face challenges in achieving both portability and small thickness.
Innovation Solution
Incorporating a light blocking layer and a hard coating layer with UV absorbent on the top surface of the polarizing plate or transparent base, reducing the overall thickness and curvature radius of the device while preventing UV-induced color changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a foldable display device is designed with a small thickness to improve portability, then the device can be folded with a smaller curvature radius and is more portable, but it becomes difficult to incorporate sufficient UV blocking layers without increasing thickness
Solution Approach 1:
The patent combines the UV blocking function with the hard coating layer by incorporating UV absorbers into the hard coating material. This merging of functions allows the single layer to simultaneously provide both mechanical protection and UV filtering, eliminating the need for separate UV blocking layers and thus maintaining thin device profile while ensuring adequate UV protection
Solution Approach 2:
The hard coating layer is designed to serve multiple functions: providing mechanical hardness and scratch resistance, and simultaneously blocking UV rays through incorporated UV absorbers. This multi-functional design allows thin device construction while maintaining both protective and UV blocking capabilities
2Stability of the object's composition
If a foldable display device is exposed to UV rays for a long time, then the device remains thin and portable, but the polarizing plate undergoes physical property changes causing greenish color shift
Solution Approach 1:
The UV absorbers in the hard coating layer provide preliminary protection by absorbing UV rays before they can reach and damage the polarizing plate. This preventive action blocks harmful UV radiation in advance, preventing the physical property changes and greenish color shift that would otherwise occur with prolonged UV exposure
3Object-affected harmful factors
If separate UV blocking layers are added to protect against UV rays, then UV protection is improved, but the overall device thickness increases
Solution Approach 1:
The patent merges the UV blocking function with the existing hard coating layer by incorporating UV absorbers into the hard coating material formulation. This integration eliminates the need for separate UV blocking layers, maintaining thin device profile while ensuring adequate UV protection
Solution Approach 2:
The hard coating layer is designed to serve multiple functions simultaneously: providing mechanical hardness and scratch resistance, and blocking UV rays through incorporated UV absorbers. This multi-functional approach achieves UV protection without increasing device thickness
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 solution enhances portability by allowing a smaller foldable display device thickness and improves manufacturing efficiency while maintaining image quality by blocking UV rays, preventing a greenish color shift.
Implementation Method 1
a hard coating layer for covering the polarizing plate and the light blocking layer and including a UV absorbent
Data Source
AI summary
A foldable display device includes a display panel, a protective base disposed on a top surface of the display panel, a polarizing plate disposed on a top surface of the protective base, a light blocking layer disposed at an edge of a top surface of the polarizing plate, and a hard coating layer for covering the polarizing plate and the light blocking layer and including a UV absorbent.