扩散膜

扩散膜是LCD背光模组（BLU）中的关键光学元件，它散射并均匀化LED光源发出的光。它利用微观表面结构或嵌入粒子来重新引导光线，将点光源转化为均匀的平面光分布。该元件确保显示表面亮度一致，同时减少可见的LED图案并改善视角。

扩散膜基于光散射原理工作，采用表面微结构（棱镜、透镜或随机图案）或通过嵌入粒子（如二氧化硅或聚合物微珠）进行体积扩散。当LED发出的光穿过薄膜时，这些结构或粒子会引起多次折射和反射，使光线均匀分布在表面上。这将集中的光点转化为具有受控角度分布的均匀光场。

The diffuser film operates on light scattering principles using either surface microstructures (prisms, lenses, or random patterns) or volumetric diffusion through embedded particles (such as silica or polymer beads). When light from LEDs passes through the film, these structures or particles cause multiple refractions and reflections, spreading the light evenly across the surface. This transforms concentrated light points into a uniform light field with controlled angular distribution.