Apple Inc.

Instrument Systems Optische Messtechnik Gmbh

Amy M Winkler

David W Ritter

Zhen Zhang

Zhang Jia

Christopher S Erickson

Reto Haring

Christoph Kappel

Florian Schewe

Markus Estermann

Felix Frank

Corin Michael Ricardo Greaves

An electronic device may be provided with a color sensing ambient light sensor. The color sensing ambient light sensor may measure the color of ambient light. Control circuitry in the electronic device may use information from the color sensing ambient light sensor in adjusting a display in the electronic device or taking other action. The color sensing ambient light sensor may have light detectors with different spectral responses. A test system may be used to calibrate the color sensing light sensor. The test system may have a tunable light source with light-emitting diodes that are turned on in sequence while gathering measured responses from the detectors. Numerical optimization techniques may be used to produce final versions of the spectral responses for the light detectors from the measured responses and corresponding calibration data that is stored in the electronic device.

Methods for color sensing ambient light sensor calibration

The invention relates to an apparatus for generating light, comprising a plurality of light sources (), &#x2014;a control device (), which drives the light sources (), and a superimposition optical unit, which superimposes the light emitted by the light sources () in an exit opening (). It is an object of the invention to provide an apparatus which is improved compared with the prior art. For this purpose, the invention proposes that the superimposition optical unit comprises a first concave mirror (), in the focal plane of which the light sources () are situated, an optical grating (), onto which the first concave mirror () reflects the light () emitted by the light sources (), and &#x2014;a second concave mirror (), which reflects the light () diffracted at the optical grating () onto the exit opening () situated at the focus of the second concave mirror ().

Light source having a controllable spectrum

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Cupertino, CA, United States of America

Amy M Winkler