Flexible Display Back Supporting Film Segmentation
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Solution Overview
Problem
Conventional flexible display devices with single base material back supporting films face limitations in deformation resistance, resilience, and transparency, making them unsuitable for foldable display products, as they form unrecoverable creases and risk fracture when bent, while materials with high elastic modulus and breaking strength compromise transparency and are difficult to observe through for automatic optic inspection.
Innovation Solution
A flexible display device with a back supporting film comprising two different base materials, where a transparent UV-cured adhesive layer binds the first base material in the bonding region for high adhesiveness and transparency, and a second base material with higher elastic modulus and breaking strength is used in the non-bonding region for improved bending resistance and resilience, utilizing different adhesives for each region to meet specific requirements.
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 deteriorates
Solution Approach 1:
The back supporting film is segmented into multiple base material layers with different properties. The first base material layer provides transparency for bonding region inspection, while the second base material layer provides high bending resistance for non-bonding region support.
Solution Approach 2:
Different regions of the back supporting film are assigned different material properties to meet local requirements. The bonding region uses transparent materials for optical inspection, while the non-bonding region uses high-strength materials for mechanical support.
2Ease of manufacture
If a single base material is used for the back supporting film, then manufacturing simplicity is maintained, but performance adaptability deteriorates
Solution Approach 1:
The back supporting film is divided into multiple base material layers, each optimized for specific performance requirements while maintaining a relatively simple overall manufacturing process.
Solution Approach 2:
The patent uses composite material structure with multiple base material layers having different properties to achieve both transparency and high bending resistance, adapting to different functional requirements in different regions.
3Difficulty of detecting and measuring
If a transparent base material is used for the back supporting film, then automatic optic inspection is enabled, but bending resistance deteriorates
Solution Approach 1:
The back supporting film is segmented into transparent first base material layer for bonding region inspection and high-strength second base material layer for non-bonding region bending resistance.
Solution Approach 2:
Transparency is localized to the bonding region to enable optical inspection, while high bending resistance is localized to the non-bonding region where mechanical support is most critical.
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 provides excellent bending resistance and resilience in the non-bonding region while maintaining high transparency and low haze in the bonding region, enabling successful automatic optic inspection and improved mechanical performance, expanding the choices of materials for the back supporting film.
Implementation Method 1
irradiating the UV curable transparent adhesive layer with a UV light through a mask, so that the UV curable transparent adhesive layer at at least a portion of a bonding region of the flexible display panel is cured and thus adhesiveness is increased
Data Source
AI summary
The present disclosure provides a flexible display device and a preparation method thereof. The flexible display device has different base materials and adhesives 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, and can be advantageous for a patterning step for base material including subtractive manufacturing.