Diffusion Film
Brightness Enhancement Film for LCD Backlight Modules
Kaixin Brightness Enhancement Film, also known as BEF prism film, is a high-performance optical film designed to improve LCD display brightness and energy efficiency. With a precision micro-prismatic structure formed on the surface of PET film, it helps redirect and concentrate light inside the backlight module, improving light utilization and display performance.
Leveraging optical film manufacturing experience and precision processing capability, Kaixin supplies brightness enhancement film for LCD TVs, monitors, tablets, smartphones and other electronic display devices. It is an important optical film material for backlight modules where higher brightness, better energy efficiency and stable visual performance are required.
How Brightness Enhancement Film Works
Brightness enhancement film improves display brightness by altering the direction of light propagation inside the LCD backlight system. Kaixin uses UV-curable adhesive technology to precisely replicate a micro-prismatic structure on the PET film surface.
When light reaches the prism structure, it is redirected through refraction and reflection. Light that does not exit at an effective viewing angle can be recycled within the backlight module. This process helps concentrate more useful light toward the display direction, improving front brightness and light efficiency.
Refraction
The prism structure changes the direction of incident light and guides more light toward the useful viewing angle.
Reflection
Light outside the effective output angle can be reflected back into the backlight module for reuse.
Light Recycling and Condensation
By optimizing light propagation, the film helps increase front brightness and reduce wasted light.
KX-ZL Brightness Enhancement Film Series
The KX-ZL series is Kaixin’s brightness enhancement film series designed for liquid crystal display applications. The film is produced by forming a uniformly distributed acrylic resin prism structure on the surface of highly transparent PET film.
This microstructure enables light recycling and light condensation, helping LCD backlight modules achieve higher brightness and improved energy efficiency. The KX-ZL series is suitable for display manufacturers, backlight module suppliers and optical film processors requiring stable optical performance and reliable roll material quality.
Product positioning: PET-based prism film for LCD backlight modules, display panels and optical film stack applications.
Product Structure of Brightness Enhancement Film
In a typical LCD backlight module, brightness enhancement film works together with diffusion film, reflective film and light guide components. Its main function is to control the direction of light after diffusion and guide more useful light toward the display viewing direction.
The optical stack may vary by display design, but BEF film is commonly used as a key light management layer in LCD backlight systems.
| Layer / Component | Function |
|---|---|
| LCD Panel | Displays image content |
| Polarizer | Controls light polarization |
| Brightness Enhancement Film | Redirects and concentrates light |
| Diffusion Film | Improves light uniformity |
| Reflective Film | Reflects light back into the module |
| Light Guide Plate | Guides light from the source |
| LED Light Source | Provides backlight illumination |
Brightness Enhancement Film Data Sheet
The following technical data is provided as a reference for Kaixin KX-ZL brightness enhancement film. Final specifications can be adjusted according to film structure, production batch, roll width and application requirements.
| Property | Direction / Unit | Standard Value | Test Method |
|---|---|---|---|
| Thickness | μm | 144 ± 2 | ASTM D374 |
| Transparency / Opacity | % | / | ASTM D1003 |
| Density | g/cm³ | 1.40 | ASTM D792 |
| Tensile Strength | MD / MPa | 191 | ASTM D882 |
| Tensile Strength | TD / MPa | 225 | ASTM D882 |
| Strain Rate | MD / % | 135 | ASTM D882 |
| Strain Rate | TD / % | 100 | ASTM D882 |
| Heat Shrinkage Rate | MD / % | -1.00 | ASTM D1204 |
| Heat Shrinkage Rate | TD / % | -0.39 | ASTM D1204 |
Roll Width and Thickness Options
Kaixin supplies brightness enhancement film materials in roll form. Roll width can be customized according to customer processing and backlight module production requirements. Standard and customized widths are available, including 300 mm, 640 mm, 800 mm, 1000 mm and other specified widths.
Multiple thickness options are available to support different optical film structures and display applications.
| Item | Available Options |
|---|---|
| Product Form | Roll material |
| Width Options | 300 mm, 640 mm, 800 mm, 1000 mm or customized width |
| Thickness Options | 0.125 mm, 0.150 mm, 0.215 mm, 0.225 mm, 0.270 mm |
| Main Substrate | PET film |
| Surface Structure | Micro-prismatic acrylic resin structure |
| Main Application | LCD backlight module and display optical film stack |
Production Process
Kaixin focuses on precision coating, forming and inspection processes to support stable brightness enhancement film quality. During production, key control points include PET substrate cleanliness, prism forming consistency, dimensional stability, cutting accuracy, masking control and final visual inspection.
Raw Material
Feeding
Hot Melding
Extruding & Molding
Stacking
Cutting
Masking
Checking
Applications of Brightness Enhancement Film
Kaixin brightness enhancement films are widely used in LCD display devices where higher brightness, improved light utilization and better energy-saving performance are required. In TV and monitor applications, BEF film helps address large-screen brightness requirements by concentrating light and supporting better image consistency.
For mobile devices such as tablets and smartphones, brightness enhancement film can improve screen visibility in bright environments while reducing power consumption through better light efficiency. This makes it suitable for compact display modules where optical performance and energy efficiency must be balanced.
| Application | Value |
|---|---|
| LCD TVs | Improves front brightness and supports large-screen brightness uniformity. |
| Monitors | Helps optimize brightness, image consistency and visual performance. |
| Tablets | Supports better outdoor visibility and improved energy efficiency. |
| Smartphones | Improves light utilization in compact display modules. |
| LCD Backlight Modules | Functions as a key optical film layer in the backlight film stack. |
Future Development of Brightness Enhancement Film
With the continuous development of display technology, brightness enhancement film will remain important for improving display brightness, energy efficiency and optical performance. Kaixin will continue to optimize BEF film performance through improved brightness enhancement, stable optical structure and more sustainable material solutions.
In addition to conventional LCD backlight modules, Kaixin will continue to explore optical film applications in emerging display technologies such as quantum dot displays and other advanced electronic display systems. The goal is to provide more efficient and environmentally responsible optical film solutions for global electronic products.
Brightness Enhancement Film FAQs
What is brightness enhancement film?
Brightness enhancement film, also known as BEF or prism film, is an optical film used in LCD backlight modules to redirect and concentrate light. It helps improve front brightness and light utilization.
How does BEF film improve display brightness?
BEF film uses a micro-prismatic surface structure to change the direction of light through refraction and reflection. This helps guide more useful light toward the display viewing direction.
What is the difference between brightness enhancement film and diffusion film?
Diffusion film helps spread light more evenly, while brightness enhancement film helps concentrate and redirect light. In many LCD backlight modules, both films are used together to balance brightness and uniformity.
What material is used for Kaixin brightness enhancement film?
Kaixin brightness enhancement film is based on highly transparent PET film with an acrylic resin micro-prismatic structure formed on the surface.
What applications are suitable for brightness enhancement film?
It is suitable for LCD TVs, monitors, tablets, smartphones, display panels and backlight module assemblies requiring higher brightness and better energy efficiency.
Can the roll width be customized?
Yes. Kaixin can provide standard and customized roll widths, including 300 mm, 640 mm, 800 mm, 1000 mm and other specified widths according to customer production requirements.
What thickness options are available?
Available thickness options include 0.125 mm, 0.150 mm, 0.215 mm, 0.225 mm and 0.270 mm.
Can Kaixin support customized BEF film requirements?
Yes. Kaixin can support customized brightness enhancement film requirements based on roll width, thickness, film structure, display application and downstream processing needs.
Request Brightness Enhancement Film Specifications
Need brightness enhancement film for LCD backlight modules, display panels or optical film processing? Contact Kaixin for roll width, thickness options, data sheet support and customized optical film solutions.
Please share your target application, required roll width, thickness, quantity and processing requirements so our team can provide a suitable recommendation.