Optical sensor sensing illuminance and proximity
First Claim
Patent Images
1. An optical sensor comprising:
- a first photodiode, wherein only a visible light filter is arranged on the first photodiode;
a second photodiode, wherein only an infrared blocking filter is arranged on the second photodiode; and
a third photodiode, wherein the third photodiode has no filters arranged thereon,wherein the optical sensor performs a first difference operation between second and third measured values measured through the second and third photodiodes, respectively, to measure a distance of an object and performs a second difference operation between a result of the first difference operation and a first measured value measured through the first photodiode to measure an illuminance of a specific wavelength.
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Abstract
An optical sensor includes photodiodes and optical filters that are arranged on the photodiodes. The photodiodes and optical filters may be spaced apart from each other. The optical filters include an infrared blocking filter and at least one visible light filter and the optical sensor measures a light quantity of a specific wavelength band in a visible light band through the photodiodes, wherein a specific visible light filter is arranged on the photodiodes. Therefore, the optical sensor has a simplified structure and may function as an ambient illuminance sensor, a proximity sensor, and a color sensor.
46 Citations
13 Claims
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1. An optical sensor comprising:
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a first photodiode, wherein only a visible light filter is arranged on the first photodiode; a second photodiode, wherein only an infrared blocking filter is arranged on the second photodiode; and a third photodiode, wherein the third photodiode has no filters arranged thereon, wherein the optical sensor performs a first difference operation between second and third measured values measured through the second and third photodiodes, respectively, to measure a distance of an object and performs a second difference operation between a result of the first difference operation and a first measured value measured through the first photodiode to measure an illuminance of a specific wavelength. - View Dependent Claims (2, 3, 4)
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5. An optical sensor, comprising:
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a first photodiode configured to measure a light quantity of an infrared ray, wherein only a visible light filter that is an infrared pass filter passing infrared light is arranged on the first photodiode; a second photodiode configured to measure a dark current of the second photodiode, wherein a visible light filter that is an infrared pass filter passing infrared light and an infrared blocking filter are arranged on the second photodiode; and a third photodiode configured to measure a light quantity for a specific wavelength of a visible light wherein only a visible light filter is arranged on the third photodiode, wherein the optical sensor performs a difference operation between the light quantity of the infrared ray measured by the first photodiode and the dark current measured by the second photodiode to measure an adjusted distance of an object, and the optical sensor performs a difference operation between the light quantity for the specific wavelength measured by the third photodiode and the light quantity of the infrared ray measured by the first photodiode to further measure an adjusted illuminance for a specific wavelength. - View Dependent Claims (6, 7, 8, 12)
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9. A method of using an optical sensor, comprising:
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measuring a first quantity of light in an infrared ray received through a first photodiode where only an infrared pass filter is arranged; measuring a second quantity of light received through a second photodiode where only an infrared blocking filter is arranged; measuring a third quantity of light received through a third photodiode where only a color filter is arranged; and measuring the ambient illuminance and the position of an object based on the measured first, second, and third quantities of light. - View Dependent Claims (10, 11)
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13. An optical sensor, comprising:
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a first photodiode configured to measure a first measured value comprising a light quantity of an infrared ray, wherein a first visible light filter is arranged on the first photodiode; and a second photodiode configured to measure a second measured value consisting of a dark current of the second photodiode, wherein a second visible light filter and an infrared blocking filter are arranged on the second photodiode, wherein the optical sensor performs a difference operation between the first measured value measured through the first photodiode and the second measured value measured through the second photodiode to further measure a distance of an object based on a result of the difference operation.
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Specification