Display device with waveguide-based talbot illuminator

US11555961B1 · kind B1 · utility

Assignee

• Meta Platforms Technologies, LLC · US

Inventors

• Alexander Koshelev · Redmond, US
• Giuseppe Calafiore · Redmond, US
• Ying Geng · Bellevue, US
• Fenglin Peng · Redmond, US
• Jacques Gollier · Sammamish, US

Key dates

• Filing date: Nov 12, 2021
• Grant date: Jan 17, 2023
• Expiry date: Nov 12, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/34
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A waveguide illuminator for illuminating a display panel includes an input waveguide, a waveguide splitter coupled to the input waveguide, and a waveguide array coupled to the waveguide splitter. The waveguide array includes an array of out-couplers out-coupling portions of the split light beam to form an array of out-coupled beam portions for illuminating a display panel. The out-coupled beam portions undergo optical interference and form a Talbot pattern of illumination correlated with pixel array of the display panel, enabling an optical throughput increase by centering individual Talbot peaks on the display panel pixels.