Among the core optical components of the LCD backlight module, the BEF prism (Brightness Enhancement Film) uses a precise microstructure to focus scattered light, significantly improving screen brightness and energy efficiency. The key surface treatment material to achieve this function, optical film UV ink, directly determines the optical performance and long-term reliability of the prism. The high-performance UV ink system based on T-6603 resin is becoming an industry-leading solution.
Core requirements of BEF prism for optical film UV ink
BEF prism surface usually has micron-level prism structure, and its optical brightening effect depends on:
Ultra-high transmittance (>92%)
Precise refractive index matching (n≈1.60)
Complete coverage of microstructure surface
Traditional solvent-based inks are prone to structural collapse or uneven thickness, while ordinary UV inks face the problems of large shrinkage stress and insufficient adhesion, which may cause micro cracks or optical distortion.
T-6603 resin: core technology support for optical grade UV ink
As the main film-forming substance of the ink system, T-6603 resin meets stringent requirements through molecular structure innovation:
Key performance advantages:
Extremely low curing shrinkage (<3%)
Specially modified polyurethane acrylate structure, orderly molecular arrangement during curing
Avoid deformation of prism microstructure due to shrinkage stress
Precise refractive index control (n=1.52±0.005)
Aromatic ring structure and high-purity monomer compound
Perfect match for PC/PMMA substrate to reduce interfacial light loss
Excellent leveling and coating
Dynamic viscosity can be controlled at 350-450cps (25℃)
Uniform micron-level film thickness is formed on the prism bevel (typical value 8-12μm)
Strong interfacial bonding
Contains polar functional groups, forming chemical bonds with prism substrate
Passed Baige test 5B level, alcohol wiping resistance >500 times
Process adaptability: precise control from coating to curing
Inks based on T-6603 resin support a variety of precision coating processes:
Micro-gravure coating: film thickness fluctuation <±0.3μm, ensuring uniform coverage of prism structure
Slit extrusion coating: suitable for ultra-thin coating (thinnest 5μm)
UV-LED curing: compatible with 365/395nm light source, first choice for temperature-sensitive substrates
Operation tips:
Prism substrates require plasma pretreatment (40-60W, argon environment)
Coating environment cleanliness must reach Class 1000
Curing energy needs to be >250mJ/cm² (to avoid surface stickiness)
Application value: Improve the overall performance of display devices
In mass production environment, T-6603-based ink brings significant benefits to BEF prisms:
Optical gain improvement: The ink layer reduces the interface reflection loss by 2%, and the equivalent brightness increases by 1.5%
Yield improvement: The reduction of curing shrinkage stress reduces the microcrack defect rate to <0.1%
Environmental compliance: Does not contain organic solvents, passed RoHS 2.0 and REACH SVHC certification
Conclusion
Optical thin film UV ink with T-6603 resin as the core solves the optical consistency, structural fidelity and durability problems in BEF prism manufacturing through the deep collaboration of material science and coating process. Its value is not only reflected in improving the performance of existing display devices, but also provides basic material guarantee for the next generation of ultra-thin and high-brightness display technology.