LIGHT SENSING DEVICE HAVING A COLOR SENSOR AND A CLEAR SENSOR FOR INFRARED REJECTION
First Claim
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1. A light sensing device comprising:
- a substrate on which there is a visibly opaque coating;
a first color sensor having a first color filter and a clear sensor having no color filter, to detect light after the substrate; and
a light intensity calculator to compute a measure of the intensity of visible light, based on a difference between (a) an output signal of the first color sensor and (b) an output signal of the clear sensor.
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Abstract
A light sensing device has a first filter to block visible light in a light path. The light sensing device also has a first color sensor and a clear sensor, to detect light in the light path after the first filter. A light intensity calculator computes a measure of the intensity of visible light in the light path, based on a difference between (a) an output signal of the first color sensor, and (b) an output signal of the clear sensor. Other embodiments are also described and claimed.
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Citations
24 Claims
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1. A light sensing device comprising:
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a substrate on which there is a visibly opaque coating; a first color sensor having a first color filter and a clear sensor having no color filter, to detect light after the substrate; and a light intensity calculator to compute a measure of the intensity of visible light, based on a difference between (a) an output signal of the first color sensor and (b) an output signal of the clear sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic device, comprising:
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a housing having integrated therein a front cover having a light transparent structural layer, the light transparent structural layer having a user-interactive display screen portion and an ambient light sensor portion, the ambient light sensor portion contains a visibly opaque layer that limits visible light outside the device from passing into a light path in the housing, a processor coupled to control brightness of the display screen portion based on a calculated measure of intensity of ambient light outside the device, and a first color sensor and a clear sensor, to detect light in said light path after the visibly opaque layer, wherein the processor is to calculate said measure of ambient light intensity based on a difference between (a) an output signal of the first color sensor and (b) an output signal of the clear sensor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An electronic device comprising:
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a first filter which blocks visible light but not infrared light in a light path; a first color sensor and a clear sensor, to detect light in said light path after the first filter; wherein the clear sensor is configured to output a signal indicative of the sensed intensity of light of several visible colors; wherein the first color sensor is tuned to sense a color of visible light; and a light intensity calculator to compute a measure of the intensity of visible light based on a difference between (a) an output signal of the first color sensor and (b) an output signal of the clear sensor. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification