Ambient light sensing technique
First Claim
Patent Images
1. An electronic device, comprising:
- a display including a first backlight;
a keyboard illuminated by a second backlight; and
an ambient light sensor configured to detect ambient light levels and to operate in accordance with a spectral response function that varies based on the detected ambient light levels such that the spectral response function comprises a first peak response of the ambient light sensor that occurs at a first wavelength for a first ambient light level and a second peak response that occurs at a second wavelength different from the first wavelength for a second ambient light level lower than the first ambient light level;
wherein the brightness of the first and second backlights is controlled based on output from the ambient light sensor and on the variation of the spectral response function of the ambient light sensor.
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Abstract
A method for controlling characteristics of an electronic device based on ambient light levels is provided. In one embodiment, the method includes receiving light at an ambient light sensor of a device and measuring components, such as color components, of the visible light. The component levels may be weighted differently by factors that vary based on the intensity of the light received by the ambient light sensor. Also, the brightness level of a light source in the device or color output of the device may be controlled based on the weighted component levels. Additional methods, systems, and devices relating to control of an electronic device based on sensed ambient light are also disclosed.
24 Citations
21 Claims
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1. An electronic device, comprising:
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a display including a first backlight; a keyboard illuminated by a second backlight; and an ambient light sensor configured to detect ambient light levels and to operate in accordance with a spectral response function that varies based on the detected ambient light levels such that the spectral response function comprises a first peak response of the ambient light sensor that occurs at a first wavelength for a first ambient light level and a second peak response that occurs at a second wavelength different from the first wavelength for a second ambient light level lower than the first ambient light level; wherein the brightness of the first and second backlights is controlled based on output from the ambient light sensor and on the variation of the spectral response function of the ambient light sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving light at an ambient light sensor; measuring intensity levels of different components of the received light; generating a first set of weighted measured intensity levels of the different components using the measured intensity levels and a first set of weighting factors, wherein the first set of weighting factors is associated with a photopic luminance range; calculating a first luminance of the first set of weighted measured intensity levels; and controlling the brightness level of a light source based on the first luminance when the first luminance is above an upper threshold value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a display panel; an ambient light sensor configured to receive ambient light and to operate in accordance with a spectral response function that varies based on the received ambient light such that a first peak response of the ambient light sensor occurs at a first wavelength for a first ambient light level and a second peak response occurs at a second wavelength different from the first wavelength for a second ambient light level lower than the first ambient light level; and a processor configured to provide image data to be displayed by the display panel; wherein the system is configured to alter color output of the display panel based on at least one characteristic of the received ambient light, wherein the at least one characteristic of the received ambient light comprises a variation of the spectral response function of the ambient light sensor. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification