| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine concavo-convex-surfaced material capable of restoring proper white color and achieving good front luminance while maintaining a certain amount of view angle.SOLUTION: A fine concavo-convex-surfaced material, having a fine concavo-convex pattern formed at least on a portion of a surface thereof, features a relationship between FWHM (FWHM) in a direction Y, in which light passing through the surface with the fine concavo-convex pattern is most widely distributed, and FWHM (FWHM) in a direction X perpendicular to the direction Y that satisfies expression (1) below, where FWHMis no less than 4°, and a relationship between FWHMand FWnM (FWnM) in the direction X that satisfies expression (2) below: FWHM/FWHM≥1.2 ...(1), FWHM×(n×0.033+1.267)+n×2.5≥FWnM≥FWHM×(n×0.033+1.267)+n×0.667-2.667 ...(2), where n is a natural number between 4 and 10.SELECTED DRAWING: Figure 1 |
