Patent ID: 8592744

Claim:
For use in controlling the operation of an electronic device, a sensor arrangement comprising: a light sensor circuit configured and arranged to provide at least one output corresponding to an intensity of light incident upon the light sensor circuit, the light sensor circuit including: a first light sensor configured and arranged to respond predominantly to light incident upon the light sensor circuit and in the visible spectrum, and a second light sensor configured and arranged to respond predominantly to light incident upon the light sensor circuit and in the infrared spectrum; and a controller circuit configured and arranged to determine the presence of artificial light based upon the at least one output, by determining a ratio between a response of the first light sensor and a response of the second light sensor, determining a color temperature of light incident on the light sensor circuit based upon the determined ratio, filtering, for light incident on the light sensor circuit, direct current (DC) components of light intensity variations from the at least one output of the light sensor circuit to produce a filtered output, and detecting, using the filtered output, the presence of an artificial source by correlating variations in the intensity, for light incident on the light sensor circuit, to variations in intensity resulting from a corresponding type of artificial source, and selectively operate circuits in the electronic device in response to determining the presence of artificial light.