Optical Diffusion Film
RINA TECH optical diffusion film is a high-performance functional film specially designed for uniform scattering of light. It converts point light sources or line light sources into uniform surface light sources through precisely controlled microstructures or diffused particles, eliminating glare and uneven brightness. It is widely used in display, lighting and emerging optical fields.
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Product Introduction
Rina Technology Co., Ltd. is one of the leading manufacturers and suppliers of optical diffusion film in China. Welcome to wholesale durable products in stock here and get quotation from our factory. All customized products are with high quality and low price.
Optical Diffusion Film Technology: A Comprehensive Guide
1. Definition of Optical Diffusion Film
Optical diffusion film is a specialized functional optical material designed to uniformly scatter incident light. Its primary purpose is to create soft, homogeneous illumination by eliminating direct imaging of light sources through controlled light diffusion.
Key characteristics include:
Light homogenization capability: Transforms point/line light sources into surface light sources
Haze control: Typically exhibits 50%-95% haze values
Light transmittance: Maintains high transparency (80%-95%) while providing diffusion
Anti-glare performance: Effectively reduces direct glare
Angular light distribution: Controls viewing angle characteristics
Technical parameters:
Total transmittance: 85-95%
Haze: 50-95% (adjustable based on application)
Surface roughness: 0.5-5μm (depending on diffusion requirements)
Thickness: Typically 50-250μm (including substrate)
Composition of Diffusion Films
Substrate Materials
Polyethylene terephthalate (PET):Thickness range: 50-250μm,Most common substrate (＞80% market share),Excellent mechanical properties and thermal stability
Polycarbonate (PC):,Higher temperature resistance (up to 150°C),Better impact strength than PET
Polymethyl methacrylate (PMMA):,Outstanding optical clarity (92% transmittance),UV resistance
Glass substrates:,Used for high-end applications,Excellent dimensional stability
Diffusion Particles
Silicone-based particles:,Particle size: 2-20μm
Refractive index: 1.41-1.58,Excellent dispersion stability,Acrylic resin particles:
Particle size: 1-15μm,Good compatibility with resin matrix,Cost-effective solution
Silicon dioxide (SiO₂):,Particle size: 0.5-10μm,High hardness and thermal stability
Cross-linked polymer beads:,Particle size: 3-25μm,Customizable refractive index
Functional Coatings
UV-curable resins:Form micro-structured surfaces,Acrylic or urethane-based formulations
Anti-static layers:,Surface resistance: 10⁶-10⁹ Ω/sq,Prevent dust accumulation,
Hard coatings:,Pencil hardness: 3H-6H,Enhance abrasion resistance
Anti-reflection coatings:,Multilayer interference coatings,Increase light transmission
Manufacturing Processes
Coating Process (Most Common)
Substrate preparation:
Corona treatment (40-50 dynes/cm surface energy),Primer coating for adhesion promotion
Diffusion layer coating:Precision dispersion of particles in UV resin
Coating methods:,Micro-gravure coating (accuracy ±0.5μm),Slot-die coating (for uniform thickness),Wet thickness control: 10-50μm
UV curing:
Mercury lamp or LED UV source,Energy dose: 300-1000mJ/cm²,Nitrogen inert atmosphere for surface quality
Post-processing:,Hard coat application,Precision slitting (tolerance ±0.1mm),Quality inspection (automated optical detection)
Embossing Process
Master pattern fabrication:,Diamond turning or lithography,Nickel shim production
Resin coating:,UV or thermal curable resins,Micro-structure embossing:,Pressure: 2-10kg/cm²,Temperature: 80-150°C,Curing and release
Co-extrusion Process
Material preparation:,Base resin (PET/PC/PMMA),Diffusion masterbatch,Multi-layer extrusion:,3-7 layer structures,Layer thickness control: ±2%,Casting and stretching:,MD/TD orientation control,Thickness variation: ＜3%
4. Application Scenarios
Display Technologies
LCD backlight units (BLUs):Position: Above light guide plate,Function: Eliminate hot spots,Market share: ~60% of total usage,OLED displays:,Pixel diffusion layer,Thinner films (＜100μm),E-paper displays:,Front light diffusion,Special low-haze requirements
Lighting Applications
LED panel lights:Commercial lighting fixtures,Eliminate individual LED spotting
Automotive lighting:Instrument cluster backlights,Center stack displays
Architectural lighting:Uniform illumination surfaces,Glare reduction
Specialty Applications
Medical displays:Surgical light diffusion,High CRI requirements (＞90)
Projection systems:Light integrator components,High temperature resistance
Smart windows:Privacy while maintaining transparency,Often combined with PDLC films
Emerging Applications
AR/VR devices:Waveguide light homogenization,Ultra-thin requirements (＜50μm)
Automotive HUDs:Windshield projection layers,Combiner film technology
Flexible displays:Bendable diffusion solutions,Radius of curvature ＜5mm
Technical Development Trends
Material Innovations
Nano-composite materials:Improved optical performance,Reduced particle size (＜100nm)
Environmentally friendly formulations:Water-based coating systems,Halogen-free materials
High refractive index particles:Improved diffusion efficiency,Thinner film possibilities
Process Advancements
Roll-to-roll nanoimprinting:Sub-100nm feature sizes,High throughput manufacturing
In-line quality monitoring:Real-time optical measurement,AI-based defect detection
Multi-functional integration:Combined diffusion/prism/reflector films,Simplified optical stacks
Application-Specific Developments
Mini/Micro-LED displays:Fine pitch diffusion requirements,High brightness applications
Transparent displays:Selective light control,Directional diffusion
Energy-efficient lighting:Light recycling technology,Enhanced extraction efficiency
RINA TECHNOLOGY
is a high-tech enterprise specializing in research, development, production , sales of Optical LED products and provide the one step optical lighting solution for customers. Established in 2011, Hong Kong, after years of rapid development, Rina Tech has settled office and factory in Shenzhen, and has professional senior technicians and qualified managers, has a talented team for product research and designing. Nowadays, we have laser cutting machines, printers, film cutting machines, injection molding equipments, high-standard assembly workshops, BM-7 clean machines and other advanced equipments. Our factory daily output is more than 80000pcs. to cater for the market at home and abroad. With years of unremitting effort,RINA TECH has passed get the Registration Certificate of Customs Declaration Unit of the People's Republic of China , National Credit Cultivation Certificate and Get our own Brand already. We has made many breakthroughs in researching and manufacturing and has obtained lots of good reputation from oversea customers. Now we has cooperated with and become strategic partner of some famous enterprises such as LG, Samsung, Lenovo etc. "Living on Sincerity, following with Market, Advancing by Specialty" is our eternal philosophy, and the company motto is "Good at Production, Good for Society". We look forward to cooperating with you to make the world better and future brighter!
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FAQ
1. What does a diffusion film do?
It makes light soft and even by scattering it. Think of it like frosted glass - it removes bright spots and glare while keeping the light bright overall.
2. Where are diffusion films used?
Mainly in screens and lights:
TV/phone/computer displays
LED light panels
Car dashboards
Virtual reality headsets
3. What are they made of?
Most have 3 parts:
Clear plastic base (usually PET)
Tiny light-scattering particles
Protective coating
4. How thick are they?
Typically as thin as a human hair:
Regular displays: 0.05-0.25mm
Phones/VR: even thinner (<0.1mm)
5. What's new in diffusion films?
Recent improvements focus on:
Better performance in foldable phones
Working with ultra-HD Mini LED screens
More eco-friendly materials
Lower production costs
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