Curved Display Window Polymer Composite Impact Resistance
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Solution Overview
Problem
Existing display devices with flexible substrates face challenges in maintaining impact resistance and light transmittance when bent beyond certain angles, leading to potential cracking and reduced durability.
Innovation Solution
A window for display devices is designed with a base substrate composed of a blend of polymers, including polycarbonate and polymethyl methacrylate, coated with a multi-layer organic and inorganic material structure, featuring light blocking and transmission areas to enhance impact resistance and maintain light transmittance even when bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the window is made from a single polymer material to ensure durability, then impact resistance is improved, but light transmittance deteriorates when bent
Solution Approach 1:
The window uses a composite material consisting of polycarbonate as the continuous phase and PMMA as the dispersion phase. This composite structure allows the window to simultaneously achieve high impact resistance from polycarbonate and high light transmittance from PMMA, even when bent. The composite material resolves the contradiction by combining materials with complementary properties rather than relying on a single polymer.
Solution Approach 2:
The patent applies different polymer phases in specific distributions within the window material. The continuous polycarbonate phase provides structural integrity and impact resistance, while the dispersed PMMA phase provides light transmittance. This local differentiation of material properties within the composite allows simultaneous optimization of both impact resistance and light transmittance.
2Adaptability or versatility
If the window is bent beyond certain angles to achieve flexible display shapes, then adaptability is improved, but cracking occurs reducing reliability
Solution Approach 1:
The composite structure of polycarbonate continuous phase and PMMA dispersion phase creates a material that can bend without cracking. The polycarbonate provides flexibility and crack resistance, while the dispersed PMMA maintains structural integrity during bending. This composite approach allows the window to achieve high bending angles while maintaining reliability and preventing cracks.
Solution Approach 2:
The patent changes the material parameters by using a blend of polymers with different mechanical properties. The polycarbonate component provides ductility and bendability, allowing the window to adapt to various shapes without cracking, while the overall composite structure maintains sufficient strength to prevent failure during bending operations.
3Ease of manufacture
If the window uses a simple single-layer structure to reduce complexity, then manufacturing is simplified, but impact resistance and light transmittance cannot be simultaneously optimized
Solution Approach 1:
Rather than using multiple separate layers that would complicate manufacturing, the patent uses a composite material where polycarbonate and PMMA are combined in a single homogeneous structure with polycarbonate as continuous phase and PMMA as dispersion phase. This single-phase composite approach simplifies manufacturing compared to multi-layer structures while simultaneously achieving both high impact resistance and high light transmittance.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A display device including a display panel (DP1) and a window (WD1). The display panel (DP1) includes curved display portions (CDP11, CDP12). The window (WD1) covers the display panel (DP1) and includes a light transmitting base substrate (BS1). The base substrate (BS1) includes bent portions (BP-1, BP-2). The bent portions (BP-1, BP-2) are defined by bending at least a portion of the base substrate (BS1) and cover the first curved display portions (CDP11, CDP12). The base substrate (BS1) includes a composition material comprising at least two different polymer materials.