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 exposed to visible light in a light path;
a first color sensor having a first color filter and a clear sensor having no color filter, to detect light in said light path 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.
12 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 exposed to visible light in a light path; a first color sensor having a first color filter and a clear sensor having no color filter, to detect light in said light path 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