High-performance optical film
NotePart 1: Product Structure
1. High-Performance Optical Film Architecture and Design
1.1 Multi-Layer Composite Structure
- Representative Layered Architecture:
- As illustrated in the schematic structure, the optical protective film is engineered with a sophisticated multi-layer configuration (which can be further tailored or expanded based on specific functional demands):
- Protection Film (Layer 1): Shields the top functional surface prior to application.
- Hard-Coated PET Film (Layer 2): The core functional substrate coated with Hard Coating providing Anti-Reflective (AR) and/or Anti-Glare (AG) functionalities.
- Green TPU Layer (Layer 3): Our synthesized eco-friendly, high-performance TPU acting as the core high-impact-resistant layer.
- Silicone PSA (Layer 4): Silicone Pressure-Sensitive Adhesive designed for reliable bonding and bubble-free attachment to electronic screen glass.
- Release Liner (Layer 5): Protects the adhesive layer before installation.
- As illustrated in the schematic structure, the optical protective film is engineered with a sophisticated multi-layer configuration (which can be further tailored or expanded based on specific functional demands):
- Figure 1: Typical 5-layer composite structure of the optical protective film integrating Green TPU.
1.2 Core Performance Requirements for Screen Protection
- Target Application:
- Designed specifically for advanced electronic device screen protection, demanding rigorous optical-grade quality and mechanical durability.
- Three Pillar Requirements:
- Impact Resistance: Leveraging the unique energy-dissipating Green TPU layer to protect screens from drops and localized shocks.
- Anti-Nail Scratch Performance: Resisting everyday marring, indentation, and fingernail scratching during active use.
- High Transparency: Maintaining exceptional visual clarity, high transmittance, and anti-reflective/anti-glare synergy without optical distortion.
TipPart 3: Anti-Nail Scratch Performance
3. Anti-Nail Scratch Resistance and Self-Healing Behavior
3.1 Testing Criteria & Benchmark Comparison
- Testing Methodology:
- Evaluated using a Keyence VK3000 3D laser scanning microscope to measure surface 3D topography and indentation profiles after a standardized fixed force is applied and dragged across the surface.
- Industry Standard for Qualification:
- The qualification threshold requires that the residual scratch dimensions (Width \(\times\) Depth) must not exceed that of a conventional qualified reference standard (\(250 \times 0.2\,\mu\text{m}\)), or that deep initial indentations must rapidly recover to within acceptable specifications. (Note: Conventional qualified reference samples typically pass the nail scratch test but fail rigorous anti-impact requirements).
- Figure 3: 3D profile and cross-sectional depth of a conventional qualified sample (\(W \times H: 250 \times 0.2\,\mu\text{m}\)).
3.2 Performance of Green TPU Optical Film & 9-Day Recovery
- Immediate Test Results:
- As demonstrated by the Keyence 3D profile in Figure 4, our Green TPU composite film fully satisfies the strict criteria right after testing, matching the standard threshold (\(250 \times 0.2\,\mu\text{m}\)) while simultaneously retaining superior impact resistance.
Figure 4: Keyence 3D morphology and depth profile of the Green TPU film showing initial compliance.
- Remarkable Self-Healing Phenomenon (Day 9):
- Even more remarkably, due to the exceptional viscoelasticity and delayed elastic recovery endowed by our tailor-made network architecture, the 3D profile measured on the 9th day reveals that the scratch marks completely vanished, with the depth successfully reducing to \(0\,\mu\text{m}\) (\(250 \times 0\,\mu\text{m}\)).
- This highlights an outstanding long-term surface resilience and self-healing synergy ideal for daily electronic device usage.
Figure 5: Keyence 3D morphology and depth profile of the Green TPU film showing complete scratch disappearance after 9 days.
TipPart 4: Optical Characteristics
4. Optical Performance and Transmittance Analysis
4.1 Visible Light Transmittance Spectra (\(400 - 700\,\text{nm}\))
- Comparative Evaluation:
- The light transmittance across the visible spectrum (\(400 - 700\,\text{nm}\)) was thoroughly evaluated for various single-layer and composite film configurations using spectrophotometry.
- Tested Configurations in Spectrum:
- Black Curve: Single-layer HC PET (\(50\,\mu\text{m}\)).
- Green Curve: Pure Green TPU (\(30\,\mu\text{m}\), H40).
- Red & Blue Curves: Composite structures of PET/H40 at different thicknesses (\(80\,\mu\text{m}\) and \(65\,\mu\text{m}\), respectively).
- Figure 6: Light transmittance comparison across the visible light spectrum (\(400 - 700\,\text{nm}\)) for PET, Green TPU, and their composite structures.
4.2 Key Optical Insights: High Transparency & Anti-Reflection Synergy
- Superior Transmittance of TPU:
- As clearly indicated by the spectral curves, the configurations incorporating the Green TPU layer (both pure H40 and PET/H40 composites) consistently exhibit significantly higher transmittance across nearly the entire visible range compared to the baseline HC PET film.
- Anti-Reflection & Enhancement Effect:
- More importantly, the integration of the tailored Green TPU layer achieves an optical enhancement effect, minimizing internal reflection losses and preserving exceptional visual clarity, which is essential for high-end electronic display protection without causing chromatic aberration or image distortion.