We have developed novel light‐diffusing films by forming two kinds of refractive‐index distribution structures inside a film. The depth of the non‐structural region, which appears near the surface, was controlled by the first UV irradiance. Moreover, the louver or column structures could be formed to this region by the second irradiation. This novel film has both isotropic and anisotropic diffusion property and will contribute to realize the new low power display systems.
We have developed a color-reflective liquid crystal display with a wide color gamut, wide viewing angle, and motion picture capability. Control over the anisotropy of optical diffusion was achieved by optimizing the internal refractive index distribution using a novel diffusion layer, resulting in a high reflectivity across a wide angle range.
In this study, bent structure and two-step irradiation technique were investigated to optimize the internal refractive-index distribution structure of a diffusion film used for reflective displays. The resulting triple-layer film configuration exhibited a wide viewing angle and improved utilization efficiency of ambient light Author
We developed a novel light diffusion film with a double diffusion layer structure for high reflectivity and a wide diffusion angle range. We demonstrated that the internal layer structure of the light diffusion film is controlled by the diffusion angle of the ultraviolet (UV) light used for photopolymerization. We successfully fabricated two different diffusion layers in a single polymer film using a two-step UV curing process and achieved a wide diffusion angle range and high reflectivity normal to the film surface. Our light diffusion film can control the distribution of diffused light, and should contribute to the development of future low-power reflective displays with high reflectivity similar to the white paper.
We have developed a reflective color liquid crystal display with high reflectivity of 60% and a good contrast ratio of 50:1, and a wide color gamut of 50% of NTSC color standards. We fabricated two light diffusion layers with different diffusion angle range in a single polymer film by using two-step UV irradiation process and achieved high reflectivity across a wide angle range. Our reflective display has a high image quality as well as a low power consumption, therefore it is expected to contribute to the development of future low power display applications including smart watches, e-book readers, and digital signages.
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