Augmented reality headset including viewing direction independent single-layer, pixelated light dimming filter

US11187907B2 · kind B2 · utility

Assignee

• LC-TEC Displays AB · SE

Inventors

• Jesper Osterman · Falun, SE
• Fredrik Kihlborg · Falun, SE
• Terry J. Scheffer · Portland, US

Key dates

• Filing date: Dec 17, 2020
• Grant date: Nov 30, 2021
• Expiry date: Dec 17, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G09G2360/144
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A system included in an augmented reality (AR) headset prevents reduction in legibility of a near-eye image display for observation in combination with an observer's visual exterior view. The system includes a near-eye image source from which emanates near-eye image-carrying light and which is positioned out of the observer's direct visual exterior view. A dimming matrix display including multiple pixels is positioned so that the observer can see though them a scene in an exterior view. A partly transparent optical element is positioned so that the observer can see the scene in the exterior view and reflect the near-eye image-carrying light to provide an image for observation by the observer. A dimming controller controls amounts of scene-carrying light propagating through the multiple pixels from the locations in the scene and thereby prevents wash-out of the near-eye image when outside illumination is very bright.