Ambient light sensor and adjusting method thereof, and electronic product

• US 9,778,102 B2
• Filed: 12/24/2014
• Issued: 10/03/2017
• Est. Priority Date: 01/23/2013
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: Pang, Leilei
• Primary Examiner(s): Elahi, Shan
• Application Number:
  US14/582,766
• Publication Number:
  US 20150109455A1
• Time in Patent Office: 1,014 Days
• Field of Search: 348164
• CPC Class Codes: G01J 1/1626 Arrangements with two photodetectors, the signals of which are compared
• CPC Class Codes: G01J 1/32 adapted for automatic variation of the measured or reference value regulation of light intensity G05D25/00
• CPC Class Codes: G01J 1/4204 with determination of ambient light solar light G01J2001/4266
• CPC Class Codes: G01J 2001/4247 for testing lamps or other light sources
• CPC Class Codes: G01J 3/505 measuring the colour produced by lighting fixtures other than screens, monitors, displays or CRTs
• CPC Class Codes: H04N 23/20 for generating image signals from infrared radiation only
• CPC Class Codes: H04N 5/33 Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20

Abstract

A method for adjusting an ambient light sensor includes: acquiring a color temperature of light received by the ambient light sensor; and adjusting an output light intensity of the ambient light sensor according to the color temperature to enable output light intensities of the ambient light sensor to be consistent under received light with different color temperatures. The ambient light sensor includes: an acquiring device, configured to acquire a color temperature of light received by the ambient light sensor; and an adjuster, configured to adjust an output light intensity of the ambient light sensor according to the color temperature acquired by the acquiring device to enable output light intensities of the ambient light sensor to be consistent under received light with different color temperatures.

Claims

1. A method for adjusting an ambient light sensor, the method comprising:

acquiring a color temperature of an incoming light received by the ambient light sensor, the color temperature of the received light measuring a color characteristic of the incoming light in Kelvins;

in response to the incoming light having been received, calculating an intensity of a light output by the ambient light sensor;

adjusting the calculated intensity of the output light of the ambient light sensor according to the color temperature of the incoming light for achieving consistency with other incoming lights having different color temperatures as received by the ambient light sensor; and

communicating the intensity of the light output by the ambient light sensor to a brightness adjustment apparatus to enable the brightness adjustment apparatus to effectuate a brightness adjustment of a display device based on the intensity of the light output by the ambient light sensor.

2. The method for adjusting an ambient light sensor according to claim 1, wherein the ambient light sensor comprises:

a first photodiode that is sensitive to visible light and infrared light, and a second photodiode that is sensitive only to infrared light, and wherein the method further comprises;

acquiring a light spectral curve of the incoming light received by the ambient light sensor, a light sensitivity curve of the first photodiode and a light sensitivity curve of the second photodiode;

integrating the light spectral curve of the incoming light received by the ambient light sensor and the light sensitivity curve of the first photodiode to obtain a first data parameter Cdata, and integrating the light spectral curve of the incoming light received by the ambient light sensor and the light sensitivity curve of the second photodiode to obtain a second data parameter Irdata, and

acquiring a parameter ratio between the Cdata and Irdata as

3. The method for adjusting an ambient light sensor according to claim 2, wherein:

the output light intensity of the ambient light sensor is adjusted according to the following output light intensity calculation formula;

Lux=K×

MAX [(Cdata−

B×

Irdata),(C×

Cdata−

D×

Irdata),0], wherein Lux is an output light intensity of the ambient light sensor;

K, B, C and D are coefficients that are used to enable the output light intensity of the ambient light sensor to be close to a light intensity perceived by human eyes; and

MAX is an operation symbol for obtaining a maximum value; and

adjusting the intensity of the output light of the ambient light sensor according to the color temperature of the incoming light comprises;

adjusting a K value in the output light intensity calculation formula according to different parameter ratios

4. The method for adjusting an ambient light sensor according to claim 3, wherein:

adjusting the K value in the output light intensity calculation formula according to different parameter ratios

5. An ambient light sensor, comprising:

an acquiring device, configured to a color temperature of an incoming light received by the ambient light sensor, the color temperature of the received light measuring a color characteristic of the incoming light in Kelvins;

an output light intensity calculating device configured to calculate an intensity of a light output by the ambient light sensor; and

an adjusting device, configured to adjust the calculated intensity of the output light of the ambient light sensor according to the color temperature of the incoming light for achieving consistency with other incoming lights having different color temperatures as received by the ambient light sensor; and

, wherein the ambient light sensor is configured to

communicate the intensity of the light output by the ambient light sensor to a brightness adjustment apparatus to enable the brightness adjustment apparatus to effectuate a brightness adjustment of a display device based on the intensity of the light output by the ambient light sensor.

6. The ambient light sensor according to claim 5, further comprising:

a first photodiode sensitive to visible light and infrared light, the first photodiode being operatively connected to the acquiring device;

a second photodiode sensitive only to infrared light, the second photodiode being operatively connected to the acquiring device; and

wherein the acquiring device comprises;

a sub-acquiring device, configured to acquire a light spectral curve of the incoming light received by the ambient light sensor, a light sensitivity curve of the first photodiode and a light sensitivity curve of the second photodiode,

an integrator, configured to integrate the incoming light spectral curve of the light received by the ambient light sensor and the light sensitivity curve of the first photodiode to obtain a first data parameter Cdata, and integrate the incoming light spectral curve of the light received by the ambient light sensor and the light sensitivity curve of the second photodiode to obtain a second data parameter Irdata, and

a parameter ratio calculator, configured to acquire a parameter ratio between the Cdata and Irdata as

7. The ambient light sensor according to claim 6, wherein:

the output light intensity calculating device is further, configured to calculate the output light intensity according to an output light intensity calculation formula comprising;

Lux=K×

MAX [(Cdata−

B×

Irdata),(C×

Cdata−

D×

Irdata),0], wherein Lux is an output light intensity of the ambient light sensor;

K, B, C and D are coefficients that are used to enable the output light intensity of the ambient light sensor to be close to a light intensity perceived by human eyes; and

MAX is an operation symbol for obtaining a maximum value; and

wherein the adjusting device is configured to adjust a K value in the output light intensity calculation formula according to different parameter ratios

8. The ambient light sensor according to claim 7, wherein the adjusting device is configured to adjust the K value in the output light intensity calculation formula according to the different parameter ratios

9. An electronic product, comprising:

a display apparatus;

a display brightness adjusting apparatus connected to the display apparatus and an ambient light sensor, wherein the ambient light sensor is connected to the display brightness adjusting apparatus; and

wherein the ambient light sensor comprises;

an acquiring device, configured to a color temperature of an incoming light received by the ambient light sensor, the color temperature of the received light measuring a color characteristic of the incoming light in Kelvins;

an output light intensity calculating device configured to calculate an intensity of a light output by the ambient light sensor; and

an adjusting device, configured to adjust the calculated intensity of the output light of the ambient light sensor according to the color temperature of the incoming light for achieving consistency with other incoming lights having different color temperatures as received by the ambient light sensor; and

, wherein the ambient light sensor is configured to

communicate the intensity of the light output by the ambient light sensor to a brightness adjustment apparatus to enable the brightness adjustment apparatus to effectuate a brightness adjustment of a display device based on the intensity of the light output by the ambient light sensor.

10. The electronic product according to claim 9, wherein the ambient light sensor further comprises:

a first photodiode that is sensitive to visible light and infrared light, the first photodiode being operatively connected to the acquiring device;

a second photodiode that is sensitive only to infrared light, the second photodiode being operatively connected to the acquiring device; and

the acquiring device comprises;

a sub-acquiring device, configured to acquire a light spectral curve of the incoming light received by the ambient light sensor, a light sensitivity curve of the first photodiode and a light sensitivity curve of the second photodiode,

an integrator, configured to integrate the incoming light spectral curve of the light received by the ambient light sensor and the light sensitivity curve of the first photodiode to obtain a first data parameter Cdata, and integrate the incoming light spectral curve of the light received by the ambient light sensor and the light sensitivity curve of the second photodiode to obtain a second data parameter Irdata, and

a parameter ratio calculator, configured to acquire a parameter ratio between the Cdata and Irdata as

11. The electronic product according to claim 10, wherein the ambient light sensor further comprises:

the output light intensity calculating device is further, configured to calculate the output light intensity according to an output light intensity calculation formula comprising;

Lux=K×

MAX [(Cdata−

B×

Irdata),(C×

Cdata−

D×

Irdata),0], wherein Lux is an output light intensity of the ambient light sensor;

K, B, C and D are coefficients that are used to enable the output light intensity of the ambient light sensor to be close to a light intensity perceived by human eyes; and

MAX is an operation symbol for obtaining a maximum value; and

wherein the adjusting device is configured to adjust a K value in the output light intensity calculation formula according to different parameter ratios

12. The electronic product according to claim 11, wherein the adjusting device is configured to adjust the K value in the output light intensity calculation formula according to the different parameter ratios