Design and fabrication of a porous prism film for display backlight applications

IF 2.8 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Express Pub Date : 2024-05-30 DOI:10.1364/ome.528148

Fang-Hsuan Su, Ray-Hua Horng, Dong-Sing Wuu

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引用次数: 0

Abstract

This study demonstrates a fabrication method of a porous brightness enhancement film (pBEF) that offers brightness enhancement, light diffusion, color shift reduction, and improved thermal stability. During the ultraviolet imprinting and solvent evaporation processes, the nano/submicron-sized air pores are generated within the polymer prism structure, and micropatterns spontaneously form on the prism surface. The inner pores ranging from 30 to 450 nm can effectively scatter light to mitigate color shift, which is caused by multiple internal reflections within the prism structure. The micropatterns have multiple rings formed one around another with 5–15-µm diameter on the prism surface improve visual quality. Moreover, the obtained functions are achieved in a single film solution, obviating the need for using multiple materials, and the fabrication process is relatively simple and fast as it is conducted under ambient conditions. When the pBEF is integrated into a liquid-crystal display backlight, it provides the brightness enhancement performance and comparable viewing angle distribution of a regular BEF combined with an additional diffuser (two films) and increases brightness by ∼8% compared to a bead prism (particle-based BEF). Additionally, it reduces the redshift (Δxy) from 0.1605 to 0.1415. Furthermore, the pBEF exhibits a lower coefficient of thermal expansion than the regular BEF.

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设计和制造用于显示器背光的多孔棱镜薄膜

本研究展示了一种多孔增亮膜（pBEF）的制造方法，这种薄膜具有增亮、光扩散、减少色移和提高热稳定性等功能。在紫外线压印和溶剂蒸发过程中，聚合物棱镜结构内部会产生纳米/亚微米级的气孔，棱镜表面会自发形成微图案。内部 30 纳米到 450 纳米的气孔可有效散射光线，减轻棱镜结构内部多重反射造成的色移。在棱镜表面形成的直径为 5-15µm 的多个环状微图案提高了视觉质量。此外，所获得的功能只需一种薄膜溶液即可实现，无需使用多种材料，而且制作过程相对简单快捷，因为它是在环境条件下进行的。当 pBEF 集成到液晶显示器背光中时，它具有普通 BEF 的亮度增强性能和可比视角分布，并结合了额外的扩散器（两层薄膜），与珠棱镜（颗粒型 BEF）相比，亮度提高了 ∼ 8%。此外，它还将红移（Δxy）从 0.1605 降低到 0.1415。此外，pBEF 的热膨胀系数低于普通 BEF。

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来源期刊

Optical Materials Express MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS

CiteScore

5.50

自引率

3.60%

发文量

377

审稿时长

1.5 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optical Materials Express (OMEx), OSA''s open-access, rapid-review journal, primarily emphasizes advances in both conventional and novel optical materials, their properties, theory and modeling, synthesis and fabrication approaches for optics and photonics; how such materials contribute to novel optical behavior; and how they enable new or improved optical devices. The journal covers a full range of topics, including, but not limited to: Artificially engineered optical structures Biomaterials Optical detector materials Optical storage media Materials for integrated optics Nonlinear optical materials Laser materials Metamaterials Nanomaterials Organics and polymers Soft materials IR materials Materials for fiber optics Hybrid technologies Materials for quantum photonics Optical Materials Express considers original research articles, feature issue contributions, invited reviews, and comments on published articles. The Journal also publishes occasional short, timely opinion articles from experts and thought-leaders in the field on current or emerging topic areas that are generating significant interest.