Protective Film Modulus Control for Flexible Display Shock Resistance
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Solution Overview
Problem
Flexible electronic devices face challenges in maintaining both flexibility and shock resistance, as structures that enhance durability typically degrade flexibility, and vice versa, especially under varying temperature conditions.
Innovation Solution
A protective film with a specific modulus range that changes minimally between low and high temperatures, combined with a functional layer and adhesive layers, is applied to flexible electronic devices to enhance bending reliability and shock resistance without compromising flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a structure for reinforcing durability against shock is applied to a flexible electronic device, then shock resistance is improved, but flexibility is degraded
Solution Approach 1:
The patent applies a protective film with specifically controlled modulus values (100-1000 MPa at room temperature) that maintains flexibility while providing shock resistance. The film's mechanical properties are engineered to balance protection and flexibility, resolving the contradiction between durability reinforcement and flexibility preservation.
Solution Approach 2:
The patent controls the modulus of the protective film within specific parameter ranges (100-1000 MPa at room temperature, with specific values at different temperatures) to achieve both shock resistance and flexibility. By precisely controlling material parameters, the film provides durability while maintaining the device's flexible characteristics.
2Strength
If a protective film with high modulus is applied to ensure durability, then shock resistance is improved, but bending reliability under temperature variation is degraded
Solution Approach 1:
The patent specifies that the protective film's modulus must be within 100-1000 MPa at room temperature, with the difference between modulus at -30°C and +70°C being 900 MPa or less. This precise parameter control ensures the film maintains appropriate mechanical properties across temperature ranges, providing shock resistance while preserving bending reliability.
Solution Approach 2:
The patent pre-characterizes the protective film's mechanical properties across temperature ranges before application. By selecting films with predetermined modulus values and temperature coefficients, the system prepares for temperature variations in advance, ensuring bending reliability is maintained under varying environmental conditions.
3Strength
If the modulus of the protective film is increased to enhance shock resistance, then durability is improved, but the film becomes prone to cracking at low temperatures
Solution Approach 1:
The patent controls the protective film's modulus to be within 100-1000 MPa at room temperature and limits the temperature coefficient of modulus to 900 MPa or less between -30°C and +70°C. This parameter optimization prevents the film from becoming too rigid at low temperatures, thereby avoiding cracking while maintaining shock resistance.
Solution Approach 2:
The patent addresses the potential harm of low-temperature brittleness by carefully selecting films whose modulus naturally decreases at lower temperatures. This converts what would be a harmful effect (temperature-induced rigidity) into a beneficial property (temperature-adaptive flexibility that prevents cracking).
Data Source
AI summary
An electronic device includes a flexible display module, a window on the flexible display module, and a protective base film on the window, and having a first modulus at a first temperature and a second modulus lower than the first modulus at a second temperature 80° C. higher than the first temperature, wherein the difference between the first modulus and the second modulus may be no greater than about 985 MPa.