Photocuring Curved Screen Protector Prevents Warping
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Solution Overview
Problem
Current protective films for curved screens are prone to poor attachment, warping, and springback, especially when applied to screens with ultra-large bending angles, due to inadequate adhesion and thermal bending issues.
Innovation Solution
A thermal bending-free photocuring curved screen protective paster is developed, comprising a sequence of layers including a first protective film, OCA glue layer, a main functional layer with thermosetting acrylic resin and isocyanate, a PET film layer, a surface functional layer, and a second protective film, which are specifically formulated to prevent warping and springback by controlling the cross-linking degree and using defoaming and leveling agents to ensure strong adhesion and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional resin protective film is heated and bent into an arc surface, then the protective film can be applied to curved screens, but warping and springback problems occur with ultra-large bending angles
Solution Approach 1:
The patent changes the curing mechanism from thermal to photocuring (UV irradiation). The main functional layer uses photopolymerizable resin that cures upon UV exposure, eliminating the need for thermal bending. This parameter change in the curing process resolves the warping and springback issues associated with thermal heating while maintaining adaptability to curved screens with large bending angles.
Solution Approach 2:
The patent replaces the thermal heating mechanism with a photocuring mechanism. Instead of using heat to bend and cure the protective film, UV light is used to initiate polymerization. This substitution eliminates thermal effects that cause warping and springback, while achieving the same goal of conforming to curved screen surfaces.
2Strength
If traditional toughened film is used, then the screen protection is provided, but the curvature cannot exceed 80%
Solution Approach 1:
The patent changes the material composition to include photopolymerizable resin with specific molecular structures that allow for greater flexibility and curvature. The resin formulation, combined with photocuring, enables the protective film to conform to screens with bending angles exceeding 80% without compromising protective strength.
Solution Approach 2:
The patent uses a composite structure with multiple layers including the main functional layer containing photopolymerizable resin, OCA glue layer, and PET film layer. This composite material approach combines the advantages of different materials to achieve both high strength for screen protection and sufficient flexibility for ultra-large curvature applications.
3Strength
If the protective film is made with high cross-linking degree, then the attachment strength is improved, but the resin becomes too brittle and easy to break
Solution Approach 1:
The patent optimizes the cross-linking degree by controlling the ratio of isocyanate to hydroxyl groups in the resin system. By adjusting this parameter, the patent achieves a balance between attachment strength and flexibility, preventing excessive brittleness while maintaining strong adhesion to the curved screen surface.
Solution Approach 2:
The patent creates different functional zones within the protective film structure. The main functional layer has optimized cross-linking for attachment strength, while other layers maintain flexibility. This local quality differentiation allows the film to have strong adhesion where needed while remaining flexible overall to prevent breaking on ultra-large curvature screens.
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 effectively prevents warping and springback, providing good wear resistance, anti-scraping properties, and stable attachment to curved screens with large radii, while maintaining transparency and temperature resistance.
Implementation Method 1
the isocyanate is used as a cross-linking agent to react with a hydroxyl group in the acrylic resin to form a cross-linked network
Implementation Method 2
thermal bending-free photocuring curved screen protective paster
Data Source
AI summary
The disclosure provides a thermal bending-free photocuring curved screen protective paster which comprises a first protective film, an OCA glue layer, a main functional layer, a PET film layer, a surface functional layer and a second protective film sequentially arranged from bottom to top. The protective paster of the disclosure can be well attached to a curved screen and the like, and avoids the phenomena of warping, forming failure, springback and the like occurring after the traditional protective film is attached. The protective paster of the disclosure has good wear resistance, good anti-scraping effect, good transparency, good temperature resistance and stable structure, which can be prepared into a film with any angle, can be firmly attached to a curved screen with a large radian, and can effectively protect the curved screen.