Multi-Layer Light Conversion Film for LCD Backlight Efficiency

The patent divides the light conversion function into multiple separate layers, each containing a specific organic fluorescent dye with a defined emission wavelength range. By segmenting the conversion task across multiple layers rather than using a single high-concentration dye, the patent achieves high overall conversion efficiency while maintaining stability in each individual layer.

Each layer is designed with specific local properties - different organic fluorescent dyes are selected for each layer based on their emission characteristics. This allows optimization of conversion efficiency for specific wavelength ranges in each layer while maintaining appropriate dye concentrations that prevent excessive extinction and degradation.

The patent employs organic fluorescent dyes that are significantly cheaper than inorganic fluorescent substances. Although organic dyes were traditionally considered less stable, the patent overcomes this limitation through the multi-layer structure and encapsulation in transparent resins, achieving both cost-effectiveness and stability.

The patent creates a composite structure combining organic fluorescent dyes with transparent resins or polymers as encapsulating materials. This composite approach provides the benefits of low-cost organic dyes while the resin matrix protects against degradation from heat and oxygen, achieving stability comparable to inorganic materials.