Sheet for led light cover application

Abstract

Disclosed herein is a sheet comprising a polymeric material; light diffusing particles disposed in the polymeric material; and a non-random surface texture on a surface of the sheet; wherein the surface texture comprises hemispherical structures, partial hemispherical structures, ellipsoidal structures, immersed spherical beads, ellipsoidal beads, "bell-shape" bump, complex lens shape structures, pyramidal structures, reversed pyramidal structures, or combinations comprising at least one of the foregoing. The sheet has excellent hiding power and transmission at the same time and is suitable for LED light cover applications. The unit structures have an aspect ratio of 0.15 to 0.5 and a pitch of greater than or equal to 100 mum

Description

technical field [0001] The present disclosure relates generally to polymeric sheets and, more particularly, to polymeric sheets for light emitting diode (LED) lampshade applications. Background technique [0002] Hiding power and light transmission are two important parameters for the optical properties of sheets for LED lampshade applications. While light scattering particles (scatterers) in the sheet can improve hiding power to some extent, this improvement is limited, usually at the expense of light transmission. In particular, to achieve reasonable hiding power performance, a certain amount of diffuser loading is required. As the sheet thickness decreases, the amount of scatterer loading required to achieve the desired hiding power increases. For sheets with a thickness less than 0.5mm, the required scatterer loading can reach as high as 0.5wt% (as high as 0.5wt%) for silicone-based scatterers, while for poly(methyl methacrylate) (PMMA ) class of scatterers, the requi...

AI Technical Summary

Problems solved by technology

For sheets with a thickness less than 0.5mm, the required scatterer loading can reach as high as 0.5wt% (as high as 0.5wt%) for silicone-based scatterers, while for poly(methyl methacrylate) (PMMA ) class of scatterers, the required scatterer loading can reach as high as 1wt% (as high as 1wt%), which makes it difficult to economically obtain balanced hiding power and light transmission

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