Talbot pattern illuminator and display based thereon

US11619774B2 · kind B2 · utility

Assignee

• Meta Platforms Technologies, LLC · US

Inventors

• Jacques Gollier · Sammamish, US
• Fenglin Peng · Redmond, US
• Alexander Koshelev · Redmond, US
• Giuseppe Calafiore · Redmond, US
• Lu Lu · Kirkland, US
• Ying Geng · Bellevue, US
• Yun-Han Lee · Hengshan, TW

Key dates

• Filing date: Jul 22, 2021
• Grant date: Apr 4, 2023
• Expiry date: Jul 22, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0078
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An illuminator for a display panel includes a light source for providing a light beam and a lightguide coupled to the light source for receiving and propagating the light beam along the substrate. The lightguide includes an array of out-coupling gratings that runs parallel to the array of pixels for out-coupling portions of the light beam from the lightguide such that the out-coupled light beam portions propagate through the substrate and produce an array of optical power density peaks at the array of pixels due to Talbot effect. A period of the array of peaks is an integer multiple of a pitch of the array of pixels.