Flexible Display Back Film Segmentation for Bending and Transparency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flexible display devices face limitations in deformation resistance and resilience due to the use of polyethylene terephthalate (PET) as a back supporting film, which results in unrecoverable creases and fracture risks when bent, while materials with high elastic modulus and breaking strength offer poor transparency and high haze, making them unsuitable for automatic optic inspection (AOI).
Innovation Solution
A flexible display device with a back supporting film comprising two different base materials: a transparent first base material layer with high transmittance and low haze for the bonding region, and a second base material layer with higher elastic modulus and breaking strength for the non-bonding region, allowing for improved bending resistance and resilience without compromising transparency and AOI capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single base material with high elastic modulus and breaking strength is used for the back supporting film, then bending resistance and resilience are improved, but transparency and haze performance deteriorate
Solution Approach 1:
The back supporting film is divided into multiple base material layers with different materials. The first base material layer (PET) provides transparency for AOI, while the second base material layer (polyimide or stainless steel) provides high bending resistance and resilience. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
The invention uses a composite structure combining different base materials (PET, polyimide, stainless steel) in the back supporting film. Each material contributes its advantageous properties: PET provides transparency, polyimide provides flexibility and strength, and stainless steel provides high elastic modulus. The composite structure achieves both transparency and bending resistance simultaneously.
2Reliability
If a single base material with high elastic modulus is used for the back supporting film, then resilience is improved, but transparency deteriorates
Solution Approach 1:
The back supporting film is segmented into functional layers: the first base material layer (PET) ensures transparency for AOI inspection, while the second base material layer (polyimide or stainless steel) ensures high resilience and bending recovery. This functional segmentation resolves the contradiction between transparency and resilience.
Solution Approach 2:
Different regions of the back supporting film have different material properties tailored to local requirements. The first base material layer provides optical quality for AOI regions, while the second base material layer provides mechanical quality for bending and resilience. Each local region gets the material properties it needs.
Data Source
AI summary
The present disclosure provides a flexible display device. The flexible display device has different base materials for the back supporting film at the bonding region and the non-bonding region, so that it can satisfy the requirements for AOI and bending resistance respectively. The present disclosure also provides a back film for a flexible display device and a preparation method thereof.