本研究利用分散聚合法合成出高分子微粒子，而將其應用在LCD背光模組之光擴散膜中，使光照射到高分子微粒子可以發生散射作用而達到光均勻化之目的，所以又稱之為擴散劑。

　　本研究成功合成出粒徑分佈狹窄的三種類型擴散劑，分別有實心PS擴散劑之1.10μm、3.13μm和 5.21μm、實心PMMA之3.84μm和多孔PS擴散劑之1.10μm，進一步將與水性樹脂混合當作其基材，再經成膜得到光擴散膜，量測其光學性質，分別有擴散率與全光穿透率，並探討擴散劑之粒徑大小、添加量、折射率和總表面積對光學性質之影響。其結果顯示擴散劑的添加量越大、總表面積越大和跟基材折射率差越大會使擴散率越大但也伴隨全光穿透率越小。

　Uniformly polymer microspheres are prepared by using dispersion polymerization, and then, the microspheres are applied to the light diffuser films of the LCD backlight so to achieve the scattering function of light; hence it is also called the light diffuser.

　Three types of light diffusers which have narrow particle size distribution, including solid-centred PS diffuser with 1.10 μm, 3.13 μm and 5.21 μm, solid-centred PMMA with 3.84 μm, and porous PS diffuser with 1.10 μm, are successfully synthesized via well controlled reaction condition. Then, the light diffuser films are prepared via coating the mixture which contained various kinds of diffuser and acrylate resins. In addition, the optical properties, including diffusion ratio and total transmittance, corresponding to the diffuser size, amount of diffuser, refractive index and the total surface areas, is examined in this study. The results show that more the diffusers are added, larger the total surface areas are increased, thus, the higher of the light diffusion is. In addition, the light diffusion will increase with the increasing of the differences of refractive index between the matrix and diffuser. However, the total transmittance ratio will oppositely decrease with the light diffusion.

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