AMBIENT LIGHT SENSOR AND ADJUSTING METHOD THEREOF, AND ELECTRONIC PRODUCT

• US 20150109455A1
• Filed: 12/24/2014
• Published: 04/23/2015
• 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
• Granted Patent: US 9,778,102 B2
• Time in Patent Office: Days
• US Class Current: 348/164
• 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 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 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.

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

acquiring a color temperature of light received by the ambient light sensor comprises;

acquiring a light spectral curve of the 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 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 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

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

the output light intensity of the ambient light sensor is obtained 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

a process of 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 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:

a process of adjusting a 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 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.

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

a first photodiode sensitive to visible light and infrared light;

a second photodiode sensitive only to infrared light; and

wherein the acquiring device comprises;

a sub-acquiring device, configured to acquire a light spectral curve of the 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 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 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

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

an output light intensity calculator, configured to calculate the output light intensity, wherein an output light intensity calculation formula comprises;

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 adjuster 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 adjuster 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 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.

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;

a second photodiode that is sensitive only to infrared light; and

the acquiring device comprises;

a sub-acquiring device, configured to acquire a light spectral curve of the 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 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 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

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

an output light intensity calculator, configured to calculate the output light intensity, wherein an output light intensity calculation formula comprises;

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 adjuster 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 adjuster is configured to adjust the K value in the output light intensity calculation formula according to the different parameter ratios