WO2014114192A1 - 环境光传感器及其调节方法、电子产品 - Google Patents

环境光传感器及其调节方法、电子产品 Download PDF

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Publication number
WO2014114192A1
WO2014114192A1 PCT/CN2014/070224 CN2014070224W WO2014114192A1 WO 2014114192 A1 WO2014114192 A1 WO 2014114192A1 CN 2014070224 W CN2014070224 W CN 2014070224W WO 2014114192 A1 WO2014114192 A1 WO 2014114192A1
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Prior art keywords
ambient light
light sensor
light
light intensity
sensor
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PCT/CN2014/070224
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English (en)
French (fr)
Inventor
厐磊磊
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华为终端有限公司
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Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to JP2015532297A priority Critical patent/JP6075454B2/ja
Priority to EP14742888.2A priority patent/EP2857809B1/en
Publication of WO2014114192A1 publication Critical patent/WO2014114192A1/zh
Priority to US14/582,766 priority patent/US9778102B2/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4204—Photometry, e.g. photographic exposure meter using electric radiation detectors with determination of ambient light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J1/1626—Arrangements with two photodetectors, the signals of which are compared
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/28—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source
    • G01J1/30—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors
    • G01J1/32—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors adapted for automatic variation of the measured or reference value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/505—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by lighting fixtures other than screens, monitors, displays or CRTs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources

Definitions

  • the present invention relates to the field of sensor technologies, and in particular, to an ambient light sensor, a method for adjusting the same, and an electronic product. Background technique
  • the ambient light sensor in the mobile phone can detect the brightness of the external light source, and the mobile phone automatically adjusts the display of the mobile phone according to the brightness of the external light source. Brightness, specifically, when the ambient light level is low, the brightness of the mobile phone display screen is lowered, so that the user does not have a glare feeling and reduces power consumption; when the ambient light brightness is high, the brightness of the mobile phone display screen Raised, to avoid the user can not see the screen. Therefore, the use of ambient light sensors increases user experience and reduces the power consumption of the phone.
  • the invention provides an ambient light sensor, an adjusting method thereof and an electronic product, which make the ambient light sensor have the same output light intensity under different color temperature ambient light, thereby avoiding the deviation of the output light intensity when detecting the ambient light intensity at different color temperatures. .
  • the present invention uses the following technical solutions:
  • an adjustment method for an ambient light sensor including:
  • the output light intensity of the ambient light sensor is adjusted according to the difference in color temperature, so that the output light intensity when the ambient light sensor receives light of different color temperatures is consistent.
  • the ambient light sensor comprises: a first photodiode sensitive to visible light and infrared light; and a second photodiode sensitive only to infrared light;
  • the color temperature of the light received by the ambient light sensor includes:
  • the parameter ratio ⁇ is used to reflect that the ambient light sensor receives
  • the color temperature of the light is the color temperature of the light.
  • the output light intensity of the ambient light sensor is obtained according to the following output light intensity calculation formula:
  • Lux K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata), 0] , where Lux is the output light intensity of the ambient light sensor, K, B, C and D are used for The output light intensity of the ambient light sensor is close to a coefficient of light intensity perceived by the human eye, and MAX is an operation symbol that takes a maximum value; and the output light intensity of the ambient light sensor is adjusted according to the color temperature, so that The process in which the ambient light sensor receives the light intensity at different color temperature is consistent:
  • the output light intensity Lux of the ambient light sensor is different from ⁇ £.
  • the output light intensity of the ambient light sensor is connected to the ambient light sensor
  • the received light is equal.
  • an ambient light sensor including: An acquireer, configured to acquire a color temperature of the light received by the ambient light sensor;
  • a regulator configured to adjust an output light intensity of the ambient light sensor according to a color temperature acquired by the acquirer, so that an output light intensity of the ambient light sensor when receiving light of different color temperatures is consistent.
  • the acquirer includes:
  • a sub-acquirer configured to acquire a 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 a spectral curve of the light received by the ambient light sensor with a light sensitivity curve of the first photodiode to obtain a first data parameter Cdata, such that a spectral curve of the light received by the ambient light sensor Integrating with the light sensitivity curve of the second photodiode to obtain a second data parameter Irdata;
  • a parameter ratio calculator for obtaining a parameter ratio ⁇ , the parameter ratio ⁇ is used to reflect the
  • the color temperature of the light received by the ambient light sensor is the color temperature of the light received by the ambient light sensor.
  • the ambient light sensor further includes:
  • the regulator is specifically configured to adjust the output light intensity according to different parameter ratios
  • K in the equation makes the parameter light intensity Lux of the ambient light sensor different from ⁇ .
  • the regulator is specifically configured to adjust the output according to different parameter ratios
  • an electronic product including: a display device connected to the display device
  • the display brightness adjusting device and the ambient light sensor described above are connected to the display brightness adjusting device.
  • the ambient light sensor, the adjusting method thereof and the electronic product provided by the invention adjust the output light intensity of the ambient light sensor according to the light receiving the different color temperature, so that the output light intensity of the ambient light sensor when receiving the light of different color temperatures is uniform, thereby The deviation of the output light intensity generated by the ambient light sensor when detecting the ambient light intensity of different color temperatures is avoided.
  • FIG. 1 is an output light intensity curve of an ambient light sensor under ambient light of different color temperatures in the prior art
  • FIG. 2 is a flow chart of an adjustment method of an ambient light sensor according to an embodiment of the present invention
  • FIG. 3 is a flow chart of another method for adjusting an ambient light sensor according to an embodiment of the present invention
  • FIG. 4 is a light sensitivity curve of a first photodiode and a second photodiode according to an embodiment of the present invention
  • FIG. 5 is an output light intensity curve of an ambient light sensor before and after adjusting a K value according to an embodiment of the present invention
  • FIG. 6 is a structural block diagram of an ambient light sensor according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of another ambient light sensor according to an embodiment of the present invention. detailed description
  • an embodiment of the present invention provides a method for adjusting an ambient light sensor, including: Step 101: Acquire a color temperature of light received by an ambient light sensor; Step 102: Adjust the output light intensity of the ambient light sensor according to the color temperature, so that the ambient light sensor has the same output light intensity when receiving light of different color temperatures.
  • the output light intensity of the ambient light sensor is calculated by a formula, and the formula can reflect that the output light intensity is proportional to the received light intensity. Therefore, by adding different coefficients to the formula, the proportional relationship between the output light intensity and the received light intensity can be changed. Therefore, the output light intensity can be adjusted according to the color temperature of the received light, so that the output light intensity of the ambient light sensor when receiving light of different color temperatures is consistent.
  • the method for adjusting the ambient light sensor in the embodiment of the present invention by adjusting the output light intensity of the ambient light sensor according to the light receiving the different color temperatures, so that the output light intensity of the ambient light sensor when receiving light of different color temperatures is consistent, thereby avoiding The output light intensity deviation produced by the ambient light sensor when detecting ambient light intensity at different color temperatures.
  • the ambient light sensor specifically includes: a first photodiode sensitive to visible light and infrared light; and a second photodiode sensitive only to infrared light;
  • the color temperature of the light received by the ambient light sensor is specifically as follows:
  • Step 1011 Acquire a light language 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;
  • the photodiodes have different light sensitivity curves.
  • ChO and Chi are the light sensitivity curves of the first photodiode and the second photodiode, respectively, as can be seen, ChO is sensitive to visible light at wavelengths from 300 to 700 nm and infrared light at wavelengths from 700 to HOOnm, while Chi is only sensitive in the invisible infrared range.
  • the two curves of ChO and Chi are just examples.
  • ChO and Chi can be other shapes, as long as ChO reflects that the first photodiode is sensitive to visible light and infrared light, Chi reflects the second photoelectric The diode is only sensitive to infrared light.
  • Step 1012 Integrate the optical language curve of the light received by the ambient light sensor with the light sensitivity curve of the first photodiode to obtain a first data parameter Cdata, a spectral curve of the light received by the ambient light sensor, and a light of the second photodiode.
  • the sensitivity curve is integrated to obtain a second data parameter Irdata;
  • the color temperature of the light is the color temperature of the light.
  • the 4200K cool white (coolwhite) has a parameter ratio of ⁇ 9.
  • K, B, C, and D are the coefficients used to make the output light intensity of the ambient light sensor close to the light intensity perceived by the human eye
  • MAX is the arithmetic symbol of the maximum value.
  • the output light intensity calculation formula can reflect that the output light intensity is proportional to the received light intensity. Therefore, by adding different coefficients to the output light intensity calculation formula, the proportional relationship between the output light intensity and the received light intensity can be changed, and the K value is adjusted. Equivalent to adding different coefficients for the output light intensity calculation formula.
  • step 102 the process of adjusting the output light intensity of the ambient light sensor according to the difference of the color temperature, and the output light intensity when the ambient light sensor receives the light of different color temperatures may be specifically:
  • the output light intensity curve of the ambient light sensor has different slopes, and after adjusting the K value, the slope of the output light intensity curve of the ambient light sensor is the same, that is, the output light intensity of the ambient light sensor is uniform.
  • the above-mentioned ⁇ value in the calculation formula of the output light intensity is adjusted according to different parameter ratios
  • the output light intensity of the ambient light sensor when the parameter is different than ⁇ ⁇ Lux-specific process can be:
  • the output light intensity of the ambient light sensor is equal to the received light intensity of the ambient light sensor.
  • the dotted line is the output light intensity curve of the ambient light sensor before adjusting the K value
  • the solid line is the output light intensity of the ambient light sensor after adjusting the K value. Curve, it can be seen that after adjusting the K value, the slope of the output light intensity curve of the ambient light sensor is 1 under ambient light of three different color temperatures.
  • the slope of the output light intensity curve of the ambient light sensor is 1.2 or 0.8 or other values, as long as the slope is the same, the ambient light sensor can be made.
  • the output light intensity is the same, but when the slope is 1, the output light intensity of the ambient light sensor is equal to the received light intensity of the ambient light sensor, which best reflects the true ambient light intensity, so that the ambient light sensor detects the brightness and the human The brightness felt by the eyes is the same.
  • the photodiode is an element for detecting the brightness of the ambient light sensor. Since the photodiode has a high infrared sensitivity of 4 ,, and the infrared light is invisible light, the brightness perception of the human eye cannot be accurately simulated. Therefore, the ambient light sensor in the embodiment of the present invention includes a first photodiode sensitive to visible light and infrared light and a second photodiode sensitive only to infrared light, and finally uses the former response value minus the latter response value, thereby Minimize infrared light interference to simulate the true brightness of the human eye. Understandably, there can be only one photodiode in the ambient light sensor.
  • the output light intensity calculation formula of the ambient light sensor will It is different, but you can still adjust the output light intensity by increasing the coefficient.
  • the embodiment of the present invention only uses the ambient light of three different color temperatures of the ground, the sunlight, and the cool white light to adjust the output light intensity as an example, and the color temperature of the ambient light may be more specifically divided or more as needed. Wide range of divisions.
  • the method for adjusting the ambient light sensor in the embodiment of the present invention by adjusting the output light intensity of the ambient light sensor according to the light receiving the different color temperatures, so that the output light intensity of the ambient light sensor when receiving light of different color temperatures is consistent, thereby avoiding The output light intensity deviation produced by the ambient light sensor when detecting ambient light intensity at different color temperatures.
  • an embodiment of the present invention further provides an ambient light sensor, including:
  • the acquirer 1 is configured to acquire a color temperature of the light received by the ambient light sensor
  • the regulator 2 is configured to adjust the output light of the ambient light sensor according to the color temperature acquired by the acquirer Strong, the output light intensity when the ambient light sensor receives light of different color temperatures is consistent.
  • the adjustment method and principle of the ambient light sensor are the same as those of the foregoing embodiment, and details are not described herein again.
  • the ambient light sensor in the embodiment of the present invention adjusts the output light intensity of the ambient light sensor according to the received light of different color temperatures, so that the ambient light sensor receives the light of different color temperatures, and the output light intensity is consistent, thereby avoiding the ambient light sensor.
  • the ambient light sensor further includes:
  • first photodiode D1 sensitive to visible light and infrared light and a second photodiode D2 sensitive only to infrared light;
  • the getter 1 includes:
  • the sub-acquisor 11 is configured to acquire a light language curve of the light received by the ambient light sensor, a light sensitivity curve of the first photodiode 4, and a light sensitivity curve of the second photodiode 5;
  • the integrator 12 is configured to integrate the spectral curve of the light received by the ambient light sensor with the light sensitivity curve of the first photodiode 4 to obtain a first data parameter Cdata, so that the spectral curve of the light received by the ambient light sensor and the second photoelectric Integrating the light sensitivity curve of the diode 5 to obtain a second data parameter Irdata;
  • the parameter ratio calculator 13 is used to obtain the parameter ratio ⁇ , and the parameter ratio ⁇ is used to reflect the ambient light.
  • the color temperature of the light received by the sensor is the color temperature of the light received by the sensor.
  • the ambient light sensor further includes:
  • the output light intensity calculator 3 is used to calculate the above output light intensity, and the above output light intensity calculation formula is:
  • Lux K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata), 0] , where Lux is the output light intensity of the ambient light sensor, and K, B, C, and D are used to make the environment The output light intensity of the light sensor is close to the coefficient of light intensity perceived by the human eye, and MAX is an operation symbol that takes the maximum value;
  • the regulator 2 is specifically used to adjust the output light intensity calculation formula according to different parameter ratios.
  • the value of K makes the output light intensity of the ambient light sensor different when the parameter is different than ⁇ ⁇ .
  • the regulator 2 is specifically configured to adjust the output light intensity meter according to different parameter ratios
  • the received light intensity of the sensor is equal.
  • the adjustment method and principle of the ambient light sensor are the same as those of the foregoing embodiment, and details are not described herein again.
  • the ambient light sensor in the embodiment of the present invention adjusts the output light intensity of the ambient light sensor according to the received light of different color temperatures, so that the ambient light sensor receives the light of different color temperatures, and the output light intensity is consistent, thereby avoiding the ambient light sensor.
  • An embodiment of the present invention further provides an electronic product, including: a display device, a display brightness adjusting device connected to the display device, and the ambient light sensor, wherein the ambient light sensor is connected to the display brightness adjusting device, and the display brightness adjusting device is used according to the environment.
  • the output light intensity of the light sensor adjusts the brightness of the display device. Specifically, when the output light intensity of the ambient light sensor is low, that is, the ambient light intensity is low, the brightness of the display device is lowered, so that the user does not feel glare. At the same time, the power consumption is reduced; when the output light intensity of the ambient light sensor is high, that is, the ambient light intensity is high, the brightness of the display device is increased, and the phenomenon that the user cannot see the screen is avoided.
  • the specific structure and adjustment method of the ambient light sensor are the same as those of the above embodiment, and are not described herein again.
  • the ambient light sensor may be a single function sensor or integrated in a three-in-one light sensor.
  • a three-in-one light sensor in a mobile phone has an infrared LED and a proximity light sensor in addition to an ambient light sensor, wherein the infrared sensor The LED is used to emit close light, and the proximity light sensor is used to receive the close light reflected back from the face when the phone is close to the face, thereby turning off the screen to reduce power consumption.
  • the electronic product in the embodiment of the invention adjusts the output light intensity of the ambient light sensor according to the light receiving the different color temperature, so that the ambient light sensor receives the light of different color temperatures, and the output light intensity is consistent, thereby avoiding the ambient light sensor Output light intensity deviation when detecting ambient light intensity at different color temperatures Poor.
  • the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. .
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk or the like includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

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Abstract

公开了一种环境光传感器及其调节方法，以及电子产品，涉及传感器技术领域。环境光传感器的调节方法包括：获取环境光传感器接收到的光的色温（101）；根据色温的不同调节环境光传感器的输出光强，使环境光传感器接收到不同色温的光时的输出光强一致（102）。环境光传感器包括：获取器（1），用于获取环境光传感器接收到的光的色温；调节器（2），用于根据获取器（1）获取的色温的不同调节环境光传感器的输出光强，使环境光传感器接收到不同色温的光时的输出光强一致。环境光传感器在不同色温的环境光下的输出光强一致避免了检测不同色温下的环境光强时产生输出光强的偏差。

Description

环境光传感器及其调节方法、 电子产品 技术领域
本发明涉及传感器技术领域， 尤其涉及一种环境光传感器及其调节方法、 电子产品。 背景技术
目前， 电子产品的用户体验度越来越高， 例如手机， 会在不同的光源环 境中使用， 手机中的环境光传感器可以检测外界光源的亮度， 手机根据外界 光源的亮度自动调节手机显示屏的亮度， 具体地， 在外界环境光亮度偏低时， 手机显示屏的亮度降低， 使用户不会有刺眼的感觉， 同时降低了功耗； 在外 界环境光亮度偏高时， 手机显示屏的亮度升高， 避免了用户看不清屏幕的现 象。 因此， 环境光传感器的使用提升了用户体验度， 并且降低了手机的功耗。
然而， 现有的环境光传感器在不同色温的环境光下的输出光强不一致， 例如， 日光 ( daylight )、 冷白光（ coolwhite )和地平（ horizon )光是三种从高 色温到低色温的典型光源， 如图 1 所示， 在这三种不同色温的环境光下， 环 境光传感器的输出光强曲线的斜率不同， 因此只能较准确的检测出某一特定 光源下的光强， 从而在不同色温下的进行环境光强检测时会产生偏差。 发明内容
本发明提供一种环境光传感器及其调节方法、 电子产品， 使环境光传感 器在不同色温的环境光下的输出光强一致， 从而避免了检测不同色温下的环 境光强时输出光强的偏差。
为解决上述技术问题， 本发明釆用如下技术方案：
一方面， 提供一种环境光传感器的调节方法， 包括：
获取环境光传感器接收到的光的色温；
根据所述色温的不同调节所述环境光传感器的输出光强， 使所述环境光 传感器接收到不同色温的光时的输出光强一致。 进一步地， 所述环境光传感器包括： 对可见光和红外光敏感的第一光电 二极管以及只对红外光敏感的第二光电二极管；
所述获取环境光传感器接收到的光的色温包括：
获取所述环境光传感器接收到的光的光谱曲线、 所述第一光电二极管的 光灵敏度曲线和所述第二光电二极管的光灵敏度曲线；
所述环境光传感器接收到的光的光谱曲线与所述第一光电二极管的光灵 敏度曲线积分得到第一数据参数 Cdata, 所述环境光传感器接收到的光的光谱 曲线与所述第二光电二极管的光灵敏度曲线积分得到第二数据参数 Irdata;
获取参数比^^ , 所述参数比^≥用于反映所述环境光传感器接收到
Irdata Irdata
的光的色温。
所述环境光传感器的输出光强根据以下输出光强计算公式得到：
Lux = K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata),0] , 其中 Lux为 所述环境光传感器的输出光强， K、 B、 C和 D为用于使所述环境光传感器的 输出光强接近人眼感受到的光强的系数， MAX为取最大值的运算符号； 所述根据所述色温的不同调节所述环境光传感器的输出光强， 使所述环 境光传感器接收到不同色温的光时的输出光强一致的过程为：
根据不同的参数比^ ^调节所述输出光强计算公式中的 κ值， 使参数
Irdata
比^ £不同时所述环境光传感器的输出光强 Lux—致。
Irdata
进一步地，所述根据不同的参数比 调节所述输出光强计算公式中的
Irdata
K值， 使参数比^ ^不同时所述环境光传感器的输出光强 Lux—致的过程
Irdata
为：
所述根据不同的参数比^ ^调节所述输出光强计算公式中的 κ值， 使
Irdata
参数比 不同时所述环境光传感器的输出光强与所述环境光传感器的接
Irdata
收到的光强相等。
另一方面， 提供一种环境光传感器， 包括： 获取器， 用于获取所述环境光传感器接收到的光的色温；
调节器， 用于根据所述获取器获取的色温的不同调节所述环境光传感器 的输出光强， 使所述环境光传感器接收到不同色温的光时的输出光强一致。
进一步地， 还包括：
对可见光和红外光敏感的第一光电二极管以及只对红外光敏感的第二光 电二极管；
所述获取器包括：
子获取器， 用于获取所述环境光传感器接收到的光的光谱曲线、 所述第 一光电二极管的光灵敏度曲线和所述第二光电二极管的光灵敏度曲线；
积分器， 用于使所述环境光传感器接收到的光的光谱曲线与所述第一光 电二极管的光灵敏度曲线积分得到第一数据参数 Cdata,使所述环境光传感器 接收到的光的光谱曲线与所述第二光电二极管的光灵敏度曲线积分得到第二 数据参数 Irdata;
参数比计算器， 用于获取参数比^^ , 所述参数比^^用于反映所述
Irdata Irdata
环境光传感器接收到的光的色温。
进一步地， 所述环境光传感器， 还包括：
输出光强计算器， 用于计算所述输出光强， 所述输出光强计算公式为： Lux = K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata),0] , 其中 Lux为 所述环境光传感器的输出光强， K、 B、 C和 D为用于使所述环境光传感器的 输出光强接近人眼感受到的光强的系数， MAX为取最大值的运算符号；
所述调节器具体用于，根据不同的参数比^ ^调节所述输出光强计算公
Irdata
式中的 K值，使参数比^ ^不同时所述环境光传感器的输出光强 Lux—致。
Irdata
进一步地， 所述调节器具体用于，根据不同的参数比^ ^调节所述输出
Irdata
光强计算公式中的 K值， 使参数比^ ^不同时所述环境光传感器的输出光
Irdata
强与所述环境光传感器的接收到的光强相等。
另一方面， 提供一种电子产品， 包括： 显示装置、 连接于所述显示装置 的显示亮度调节装置和上述的环境光传感器， 所述环境光传感器连接于所述 显示亮度调节装置。
本发明提供的环境光传感器及其调节方法、 电子产品， 通过根据接收到 不同色温的光调节环境光传感器的输出光强， 使环境光传感器接收到不同色 温的光时的输出光强一致， 从而避免了环境光传感器在检测不同色温的环境 光强时产生的输出光强偏差。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为现有技术中环境光传感器在不同色温的环境光下的输出光强曲线； 图 2为本发明实施例中一种环境光传感器的调节方法流程图；
图 3为本发明实施例中另一种环境光传感器的调节方法流程图； 图 4 为本发明实施例中第一光电二极管和第二光电二极管的光灵敏度曲 线；
图 5为本发明实施例中在调节 K值前后环境光传感器的输出光强曲线； 图 6为本发明实施例中一种环境光传感器的结构框图；
图 7为本发明实施例中另一种环境光传感器的结构框图。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
如图 2所示， 本发明实施例提供了一种环境光传感器的调节方法， 包括： 步骤 101、 获取环境光传感器接收到的光的色温； 步骤 102、根据上述色温的不同调节环境光传感器的输出光强， 使环境光 传感器接收到不同色温的光时的输出光强一致。
具体地， 环境光传感器的输出光强通过公式计算得到， 该公式能够反映 输出光强与接收光强成正比， 因此为该公式增加不同的系数即可以改变输出 光强与接收光强的比例关系， 从而可以根据接收光色温的不同调节输出光强， 实现环境光传感器接收到不同色温的光时的输出光强一致。
本发明实施例中的环境光传感器的调节方法， 通过根据接收到不同色温 的光调节环境光传感器的输出光强， 使环境光传感器接收到不同色温的光时 的输出光强一致， 从而避免了环境光传感器在检测不同色温的环境光强时产 生的输出光强偏差。
进一步地， 上述环境光传感器具体包括： 对可见光和红外光敏感的第一 光电二极管以及只对红外光敏感的第二光电二极管；
如图 3所示， 上述步骤 101、获取环境光传感器接收到的光的色温具体包 括：
步骤 1011、 获取环境光传感器接收到的光的光语曲线、 第一光电二极管 的光灵敏度曲线和第二光电二极管的光灵敏度曲线；
具体地， 根据光电二极管本身的特性， 光电二极管具有不同的光灵敏度 曲线， 例如， 如图 4所示， ChO和 Chi分别为第一光电二极管和第二光电二 极管的光灵敏度曲线，可以看到， ChO在 300 ~ 700nm波长的可见光以及 700 ~ HOOnm波长的红外光范围内都较敏感， 而 Chi只在不可见的红外光范围内较 敏感。 这里的 ChO和 Chi两条曲线只是举例， 根据环境光传感器中光电二极 管的实际特性， ChO和 Chi可以为其他形状， 只要 ChO反映第一光电二极管 对可见光和红外光都敏感， Chi反映第二光电二极管只对红外光敏感即可。
步骤 1012、 环境光传感器接收到的光的光语曲线与第一光电二极管的光 灵敏度曲线积分得到第一数据参数 Cdata, 环境光传感器接收到的光的光谱曲 线与所述第二光电二极管的光灵敏度曲线积分得到第二数据参数 Irdata; 步骤 1013、获取参数比 参数比^≥用于反映环境光传感器接收
Irdata Irdata
到的光的色温。
例如， 在本发明实施例中， 色温为 2300K的地平 （horizon )光的参数比 2.1 , 色温为 6900K的日光（ daylight )的参数比^≥ ¾ 2.6 , 色温为 Irdata Irdata
4200K的冷白光（ coolwhite ) 的参数比 ^ 9。
Irdata
具体地， 环境光传感器的输出光强根据以下输出光强计算公式得到： Lux = K X MAX[(Cdata - B x Irdata), (C x Cdata - D x lrdata),0] , 其中 Lux为环境 光传感器的输出光强， K、 B、 C和 D为用于使环境光传感器的输出光强接近 人眼感受到的光强的系数， MAX为取最大值的运算符号。 该输出光强计算公 式即能够反映输出光强与接收光强成正比， 因此为该输出光强计算公式增加 不同的系数即可以改变输出光强与接收光强的比例关系， 而调节 K值就相当 于为该输出光强计算公式增加不同的系数。
上述步骤 102、根据上述色温的不同调节环境光传感器的输出光强，使环 境光传感器接收到不同色温的光时的输出光强一致的过程具体可以为：
根据不同的参数比^ ^调节输出光强计算公式中的 κ值， 使参数比
Irdata
^^不同时环境光传感器的输出光强 Lux—致。
Irdata
例如， 当参数比 0≤^≥≤2.25时， 调节 K，= , K，为调节之后输出光
Irdata 1.2
强计算公式的系数， 对 K值的调节相当于为该输出光强计算公式增加系数
—； 当参数比 2.25 < ^≥≤5时， 调节 K，= ; 当参数比 5 < ^≥时， 调 1.2 Irdata 1.4 Irdata 节 K，= 。 如图 5所示， 在调节 K值之前， 在三种不同色温的环境光下， 环 0.8
境光传感器的输出光强曲线具有不同的斜率， 而在调节 K值之后， 环境光传 感器的输出光强曲线的斜率相同， 也就是使环境光传感器的输出光强一致。
优选地， 上述根据不同的参数比^ ^调节输出光强计算公式中的 κ值，
Irdata
使参数比^ ^不同时环境光传感器的输出光强 Lux—致的过程具体可以为：
Irdata 根据不同的参数比^ ^调节输出光强计算公式中的 K值， 使参数比
Irdata
不同时环境光传感器的输出光强与环境光传感器的接收到的光强相等。
Irdata
具体地， 例如， 如图 5所示， 在三种不同色温的环境光下， 虚线为调节 K 值之前环境光传感器的输出光强曲线， 实线为调节 K值之后环境光传感器的 输出光强曲线， 可以看到， 在调节 K值之后， 在三种不同色温的环境光下， 环境光传感器的输出光强曲线的斜率都为 1。
当然也可以设置为在调节 K值之后， 在三种不同色温的环境光下， 使环 境光传感器的输出光强曲线的斜率都为 1.2或 0.8或者其他数值， 只要斜率相 同就可以使环境光传感器的输出光强一致， 但是斜率为 1 时环境光传感器的 输出光强与环境光传感器的接收到的光强相等， 最能反映真实的环境光强， 从而使环境光传感器检测到的亮度与人眼感受到的亮度一致。
需要说明的是， 光电二极管是环境光传感器中检测光亮度的元件， 由于 光电二极管具有 4艮高的红外灵敏度， 而红外光是不可见光， 无法准确模拟人 眼的亮度感受。 因此， 本发明实施例中的环境光传感器包括对可见光和红外 光敏感的第一光电二极管以及只对红外光敏感的第二光电二极管， 最终用前 者的响应值减去后者的响应值， 从而将红外光干扰降到最低， 以模拟人眼真 实的亮度感受。 可以理解的， 环境光传感器中也可以只有一个光电二极管， 通过釆用红外截止膜或其他处理方法降低红外光的干扰， 在只有一个光电二 极管的情况下， 环境光传感器的输出光强计算公式会有所不同， 但是仍然可 以用增加系数的方法来调节输出光强。 另外， 本发明实施例仅以对地平光、 日光和冷白光三种不同色温的环境光进行输出光强的调节为例进行说明， 也 可以根据需要对环境光的色温进行更加具体的划分或者更宽范围的划分。
本发明实施例中的环境光传感器的调节方法， 通过根据接收到不同色温 的光调节环境光传感器的输出光强， 使环境光传感器接收到不同色温的光时 的输出光强一致， 从而避免了环境光传感器在检测不同色温的环境光强时产 生的输出光强偏差。
如图 6所示， 本发明实施例还提供一种环境光传感器， 包括：
获取器 1 , 用于获取环境光传感器接收到的光的色温；
调节器 2,用于根据获取器获取的色温的不同调节环境光传感器的输出光 强， 使环境光传感器接收到不同色温的光时的输出光强一致。
具体地， 环境光传感器的调节方法和原理与上述实施例相同， 在此不再 贅述。
本发明实施例中的环境光传感器， 通过根据接收到不同色温的光调节环 境光传感器的输出光强， 使环境光传感器接收到不同色温的光时的输出光强 一致， 从而避免了环境光传感器在检测不同色温的环境光强时产生的输出光 强偏差。
进一步地， 如图 7所示， 上述环境光传感器， 还包括：
对可见光和红外光敏感的第一光电二极管 D1 以及只对红外光敏感的第 二光电二极管 D2;
获取器 1包括：
子获取器 11 , 用于获取环境光传感器接收到的光的光语曲线、 第一光电 二极管 4的光灵敏度曲线和第二光电二极管 5的光灵敏度曲线；
积分器 12, 用于使环境光传感器接收到的光的光谱曲线与第一光电二极 管 4的光灵敏度曲线积分得到第一数据参数 Cdata,使环境光传感器接收到的 光的光谱曲线与第二光电二极管 5 的光灵敏度曲线积分得到第二数据参数 Irdata;
参数比计算器 13 ,用于获取参数比^^ ,参数比^≥用于反映环境光
Irdata Irdata
传感器接收到的光的色温。
进一步地， 上述环境光传感器， 还包括：
输出光强计算器 3 , 用于计算上述输出光强， 上述输出光强计算公式为：
Lux = K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata),0] , 其中 Lux为 环境光传感器的输出光强， K、 B、 C和 D为用于使环境光传感器的输出光强 接近人眼感受到的光强的系数， MAX为取最大值的运算符号；
调节器 2具体用于，根据不同的参数比 调节输出光强计算公式中的
Irdata
K值， 使参数比^ ^不同时环境光传感器的输出光强 Lux—致。
Irdata 进一步地， 调节器 2具体用于，根据不同的参数比^ ^调节输出光强计
Irdata
算公式中的 K值， 使参数比^ ^不同时环境光传感器的输出光强与环境光
Irdata
传感器的接收到的光强相等。
具体地， 环境光传感器的调节方法和原理与上述实施例相同， 在此不再 贅述。
本发明实施例中的环境光传感器， 通过根据接收到不同色温的光调节环 境光传感器的输出光强， 使环境光传感器接收到不同色温的光时的输出光强 一致， 从而避免了环境光传感器在检测不同色温的环境光强时产生的输出光 强偏差。
本发明实施例还提供一种电子产品， 包括： 显示装置、 连接于显示装置 的显示亮度调节装置和上述的环境光传感器， 环境光传感器连接于显示亮度 调节装置， 显示亮度调节装置用于根据环境光传感器的输出光强调节显示装 置的亮度， 具体地， 在环境光传感器的输出光强偏低时， 即环境光强偏低， 此时显示装置的亮度降低， 使用户不会有刺眼的感觉， 同时降低了功耗； 在 环境光传感器的输出光强偏高时， 即环境光强偏高， 此时显示装置的亮度升 高， 避免了用户看不清屏幕的现象。 环境光传感器的具体结构和调节方法与 上述实施例相同， 在此不再贅述。
需要说明的是， 上述电子产品可以为手机、 MP4、 平板电脑或其他便携 式电子设备。 上述环境光传感器可以为单独功能的传感器， 也可以集成在三 合一光传感器， 例如在手机中的三合一光传感器除了具有环境光传感器外， 还集成有红外 LED和接近光传感器，其中红外 LED用于发射接近光，接近光 传感器用于在手机靠近脸部时接收脸部反射回来的接近光， 从而关闭屏幕来 降低功耗。
本发明实施例中的电子产品， 通过根据接收到不同色温的光调节环境光 传感器的输出光强， 使环境光传感器接收到不同色温的光时的输出光强一致， 从而避免了环境光传感器在检测不同色温的环境光强时产生的输出光强偏 差。
通过以上的实施方式的描述， 所属领域的技术人员可以清楚地了解到本 发明可借助软件加必需的通用硬件的方式来实现， 当然也可以通过硬件， 但 很多情况下前者是更佳的实施方式。 基于这样的理解， 本发明的技术方案本 质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来， 该 计算机软件产品存储在可读取的存储介质中， 如计算机的软盘， 硬盘或光盘 等， 包括若干指令用以使得一台计算机设备（可以是个人计算机， 服务器， 或者网络设备等）执行本发明各个实施例所述的方法。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应以所述权利要求的保护范围为准。

Claims

权利 要求 书
1、 一种环境光传感器的调节方法， 其特征在于， 包括：
获取环境光传感器接收到的光的色温；
根据所述色温的不同调节所述环境光传感器的输出光强， 使所述环境光传 感器接收到不同色温的光时的输出光强一致。
2、 根据权利要求 1所述的环境光传感器的调节方法， 其特征在于， 所述环境光传感器包括： 对可见光和红外光敏感的第一光电二极管以及只 对红外光敏感的第二光电二极管；
所述获取环境光传感器接收到的光的色温包括：
获取所述环境光传感器接收到的光的光谱曲线、 所述第一光电二极管的光 灵敏度曲线和所述第二光电二极管的光灵敏度曲线；
所述环境光传感器接收到的光的光谱曲线与所述第一光电二极管的光灵敏 度曲线积分得到第一数据参数 Cdata, 所述环境光传感器接收到的光的光语曲线 与所述第二光电二极管的光灵敏度曲线积分得到第二数据参数 Irdata;
获取参数比^^ , 所述参数比^^用于反映所述环境光传感器接收到的
Irdata Irdata
光的色温。
3、 根据权利要求 2所述的环境光传感器的调节方法， 其特征在于， 所述环境光传感器的输出光强根据以下输出光强计算公式得到：
Lux = K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata),0] , 其中 Lux为所 述环境光传感器的输出光强， K、 B、 C和 D为用于使所述环境光传感器的输出 光强接近人眼感受到的光强的系数， MAX为取最大值的运算符号；
所述根据所述色温的不同调节所述环境光传感器的输出光强， 使所述环境 光传感器接收到不同色温的光时的输出光强一致的过程为：
根据不同的参数比^ ^调节所述输出光强计算公式中的 κ值， 使参数比
Irdata
^^不同时所述环境光传感器的输出光强 Lux—致。
Irdata
4、 根据权利要求 3所述的环境光传感器的调节方法， 其特征在于， 所述根据不同的参数比^ ^调节所述输出光强计算公式中的 K值， 使参
Irdata
数比^ £不同时所述环境光传感器的输出光强 Lux—致的过程为：
Irdata
所述根据不同的参数比^ ^调节所述输出光强计算公式中的 K值， 使参
Irdata
数比^ £不同时所述环境光传感器的输出光强与所述环境光传感器的接收到 Irdata
的光强相等。
5、 一种环境光传感器， 其特征在于， 包括：
获取器， 用于获取所述环境光传感器接收到的光的色温；
调节器， 用于根据所述获取器获取的色温的不同调节所述环境光传感器的 输出光强， 使所述环境光传感器接收到不同色温的光时的输出光强一致。
6、 根据权利要求 5所述的环境光传感器， 其特征在于， 还包括： 对可见光和红外光敏感的第一光电二极管以及只对红外光敏感的第二光电 二极管；
所述获取器包括：
子获取器， 用于获取所述环境光传感器接收到的光的光谱曲线、 所述第一 光电二极管的光灵敏度曲线和所述第二光电二极管的光灵敏度曲线；
积分器， 用于使所述环境光传感器接收到的光的光谱曲线与所述第一光电 二极管的光灵敏度曲线积分得到第一数据参数 Cdata, 使所述环境光传感器接收 到的光的光谱曲线与所述第二光电二极管的光灵敏度曲线积分得到第二数据参 数 Irdata;
参数比计算器， 用于获取参数比^^ , 所述参数比^ ^用于反映所述环
Irdata Irdata
境光传感器接收到的光的色温。
7、 根据权利要求 6所述的环境光传感器， 其特征在于， 还包括： 输出光强计算器， 用于计算所述输出光强， 所述输出光强计算公式为： Lux = K x MAX [(Cdata - B x Irdata), (C x Cdata - D x lrdata),0] , 其中 Lux为所 述环境光传感器的输出光强， K、 B、 C和 D为用于使所述环境光传感器的输出 所述调节器具体用于，根据不同的参数比 调节所述输出光强计算公式
Irdata
中的 K值， 使参数比^ ^不同时所述环境光传感器的输出光强 Lux—致。
Irdata
8、 根据权利要求 7所述的环境光传感器， 其特征在于，
所述调节器具体用于，根据不同的参数比 调节所述输出光强计算公式
Irdata
中的 K值， 使参数比^ ^不同时所述环境光传感器的输出光强与所述环境光
Irdata
传感器的接收到的光强相等。
9、 一种电子产品， 其特征在于， 包括： 显示装置、 连接于所述显示装置的 显示亮度调节装置和如权利要求 5至 8中任意一项中所述的环境光传感器， 所 述环境光传感器连接于所述显示亮度调节装置。
PCT/CN2014/070224 2013-01-23 2014-01-07 环境光传感器及其调节方法、电子产品 WO2014114192A1 (zh)

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