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Samsung patents film that uses grooves to spread light evenly in displays

Patent drawing from the official filing.

Samsung describes a method for making a light-diffusing film by rubbing a textured drum against a base sheet to create parallel grooves. These grooves are then filled with a resin containing particles that scatter light in specific directions, which is then hardened to form the final film.

Why it mattersThis technique could help manufacturers create displays with more uniform brightness and better light control, which is a standard improvement in screen technology.

In the filing’s own words

A method of manufacturing a light diffusion film includes preparing a cylindrical drum having protrusions extending in a length direction on an outer circumferential surface; moving a base film having a defined width in a first direction; rubbing the cylindrical drum on the base film to form a plurality of grooves extending in a second direction perpendicular to the first direction; supplying, to the moving base film, a mixture having anisotropic light diffusion particles and a resin to fill the plurality of grooves; and curing the resin of the mixture in the plurality of grooves. The light diffusion film includes a base film with parallel grooves filled with resin containing anisotropic light diffusion particles, wherein the length of the particles is greater than the width of the grooves.

What exactly they claim (claim 1)

1. A method of manufacturing a light diffusion film, comprising: preparing a cylindrical drum having protrusions extending in a length direction on an outer circumferential surface of the cylindrical drum; moving a base film having a defined width in a first direction; rubbing the cylindrical drum on the base film and forming a plurality of grooves on the base film, the plurality of grooves extending in a second direction perpendicular to the first direction; supplying, to the moving base film, a mixture having anisotropic light diffusion particles and a resin to fill the plurality of grooves; and curing the resin of the mixture in the plurality of grooves.

Facts

Company: Samsung (SAMSUNG ELECTRONICS CO., LTD.)
Official title: LIGHT DIFFUSING FILM, MANUFACTURING METHOD THEREOF, AND DISPLAY APPARATUS COMPRISING SAME
Publication number: US20260309901A1
Application number: 19247115
Filed: Jun 24, 2025
Published: Oct 8, 2026
Inventors: 4
Claims: 15

Classified under

G02B 5/0268 Physics & computingG02B 5/0242 Physics & computingG02B 5/0257 Physics & computingG02F 1/133504 Physics & computingG02B 1/04 Physics & computingG02F 1/133562 Physics & computing

Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.