Foldable Display Window Module Composite Layer Design
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Solution Overview
Problem
Existing flexible display devices face challenges in achieving both flexibility and durability, particularly in folding and unfolding mechanisms, due to limitations in the modulus and thickness of their window layers, which affect their structural reliability and display quality.
Innovation Solution
A display device design featuring a window module with a base layer and a filler in a recess pattern, combined with a coating layer that contacts the upper surface of the base layer, where the coating layer has a higher modulus than the window layer, enhancing the flexibility and durability by allowing smooth folding and improved impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the window layer is made thinner to improve flexibility, then the folding smoothness is improved, but the structural reliability and impact resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining a window layer with a coating layer having different mechanical properties. The coating layer (10-50 μm thick with modulus 10-2000 Gpa) is formed on the window layer (100-200 μm thick with modulus 5-100 Gpa) to create a composite structure that provides both flexibility for smooth folding and sufficient strength for structural reliability and impact resistance.
2Weight of moving object
If the window layer is made thinner to reduce weight, then the device weight is reduced, but the hardness and peeling resistance deteriorate
Solution Approach 1:
The patent uses composite materials by forming a coating layer with higher modulus (10-2000 Gpa) on the window layer (modulus 5-100 Gpa). This composite structure enhances hardness and peeling resistance while maintaining reduced weight, as the coating layer provides the necessary mechanical strength without requiring the window layer itself to be thicker.
3Strength
If a coating layer with higher modulus is added to improve hardness, then the impact resistance is improved, but the device complexity increases
Solution Approach 1:
The patent applies flexible shells and thin films by using a thin coating layer (10-50 μm) with high modulus formed on the window layer. This thin film approach provides improved impact resistance and hardness without significantly increasing device complexity, as the coating layer is applied as a thin protective layer rather than adding bulky structural components.
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 enables the display device to be folded smoothly while improving durability and structural reliability, ensuring better hardness and reduced peeling of the coating layer, thus enhancing the overall performance of the flexible display.
Implementation Method 1
radiating a laser to a base layer, forming an opening pattern through the base layer by etching the base layer by reacting an etchant with an area irradiated with the laser
Data Source
AI summary
A display device includes a display module displaying an image and a window module disposed on the display module, where the window module is foldable. The window module includes a window layer including a base layer with a recess pattern and a filler filled in the recess pattern, and a coating layer disposed on the window layer and contacting an upper surface of the base layer.