ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,867, issued on Feb. 3, was assigned to Apple Inc. (Cupertino, Calif.).
"Temperature sensing using optical sensors" was invented by Wegene H. Tadele (San Francisco) and Tao Shui (Cupertino, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "This relates to using light emitting diodes (LEDs) and/or photodiodes (PDs) on a device intended to come in contact with a user for temperature sensing. In some examples, the LEDs and PDs can be used for both biometric sensing and user temperature sensing. By biasing the LEDs and PDs with different bias currents and obtaining different diode base-emitter voltages (VBE) having known negative temperature coefficie...