Display system with finger sensing

US11960683B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Bharat R. Acharya · Woodbury, US
• Robert D. Taylor · Boulder, US
• Joseph P. Attard · Woodbury, US
• Benjamin J. Forsythe · Stillwater, US
• David T. Yust · Woodbury, US
• Matthew E. Sousa · Rosemount, US
• Jason S. Petaja · Hudson, US
• Anthony M. Renstrom · Maplewood, US
• William Blake Kolb · Windom, US
• Matthew S. Cole · Woodbury, US
• Matthew S. Stay · Minneapolis, US
• Matthew R.D. Smith · Woodbury, US
• Jeremy O. Swanson · Woodbury, US
• Tri D. Pham · Woodbury, US
• David A. Rosen · North St. Paul, US
• Qunyi Chen · Okabena, US
• Lisa A. DeNicola · Okabena, US
• Quinn D. Sanford · Ellsworth, US
• Carl A. Stover · Okabena, US
• Lin Zhao · Woodbury, US
• Gilles J. Benoit · Minneapolis, US

Key dates

• Filing date: May 4, 2021
• Grant date: Apr 16, 2024
• Expiry date: May 4, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F2203/04103
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A display system for sensing a finger of a user applied to the display system includes a display panel; a sensor for sensing the finger; a sensing light source configured to emit a first light having a first wavelength W1; and a reflective polarizer disposed between the display panel and the sensor. For a substantially normally incident light, an optical transmittance of the reflective polarizer versus wavelength for a first polarization state has a band edge such that for a first wavelength range extending from a smaller wavelength L1 to a greater wavelength L2 and including W1, where 30 nm≤L2−L1≤50 nm and L1 is greater than and within about 20 nm of a wavelength L3 corresponding to an optical transmittance of about 50% along the band edge, the optical transmittance has an average of greater than about 75%.