CN102466515B - Method and system for calibrating optical sensor of mobile terminal - Google Patents
Method and system for calibrating optical sensor of mobile terminal Download PDFInfo
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- CN102466515B CN102466515B CN201010546388.7A CN201010546388A CN102466515B CN 102466515 B CN102466515 B CN 102466515B CN 201010546388 A CN201010546388 A CN 201010546388A CN 102466515 B CN102466515 B CN 102466515B
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Abstract
The invention provides a method and a system for calibrating an optical sensor of a mobile terminal, wherein the method comprises the following steps: placing the mobile terminal containing the optical sensor under a light source; measuring the illuminating value of light irradiated on the front shell glass of the mobile terminal, and recording an illuminating value measured by the optical sensor in the mobile terminal; determining the light transmission ratio of the front shell glass of the mobile terminal according to the illuminating value of the front shell glass of the mobile terminal and the illuminating value measured by the optical sensor; and calibrating the optical sensor according to the light transmission ratio of the front shell glass of the mobile terminal. According to the invention, the optical sensor is calibrated through referring to the influence of the light transmission ratio of the front shell glass, thus not only can the calibration precision be improved, but also the calibration method is simple and practicable.
Description
Technical field
The present invention relates to electronic equipment manufacturing technical field, particularly a kind of method and system of the optical sensor for calibrating mobile terminal.
Background technology
Along with the development of the communication technology, the use of the mobile terminals such as mobile phone is more and more extensive.Due to the movability of mobile phone, it is caused to be used under the environment of different brightness, but the brightness of traditional mobile phone screen is fixing, so just there is a problem: under the brightness of indoor light, the brightness of mobile phone screen is suitable, but under having arrived outdoor sunshine, mobile phone screen secretly will must not see Chu, or under having arrived dim environment, mobile phone screen seems again too bright too dazzling, causes damage to the eyesight of user.
For the problems referred to above, existing solution is: add the power that optical sensor carrys out ambient light to mobile phone, and change the brightness of screen backlight according to the power of the surround lighting detected.Like this, screen just can change brightness along with the intensity of surround lighting, user can be seen clearly, and protect eyes.
The present inventor finds that the shortcoming that prior art exists is: the optical sensor added just according to self experimental file reference value to regulate backlight, therefore the intensity of illumination detected and actual environment also have gap, thus cause the backlight illumination that adjusts inaccurate.
Summary of the invention
The optical sensor that object of the present invention is intended at least solve mobile terminal accurately cannot detect the technological deficiency of intensity of illumination.
For achieving the above object, one aspect of the present invention proposes a kind of method of the optical sensor for calibrating mobile terminal, comprises the following steps: under the mobile terminal comprising optical sensor is placed on light source; Measure the brightness value of the light be radiated on the fore shell glass of described mobile terminal, and record the brightness value that in described mobile terminal, described optical sensor is measured; The brightness value measured according to the brightness value on the fore shell glass of described mobile terminal and described optical sensor determines the transmittance of the fore shell glass of described mobile terminal; And according to the transmittance of the fore shell glass of described mobile terminal, described optical sensor is calibrated.
Another fermentation of the present invention also proposes a kind of system of the optical sensor for calibrating mobile terminal, comprise the mobile terminal comprising optical sensor, light source, illuminance measurement device and controller, wherein, described optical sensor is for measuring illuminance value, described light source is for irradiating described mobile terminal, described illuminance measurement device is for measuring the brightness value of the light on the fore shell glass being radiated at described mobile terminal, the brightness value that described controller is used for measuring according to brightness value and the described optical sensor of described illuminance measurement measurement device determines the transmittance of the fore shell glass of described mobile terminal, and according to the transmittance of the fore shell glass of described mobile terminal, described optical sensor is calibrated.
The impact that the transmittance that contemplated by the invention fore shell glass in actual production is calibrated optical sensor, transmittance by reference to fore shell glass is calibrated optical sensor, improve the precision of optical sensor calibration, and improve the actual usability of optical sensor, simultaneously, this calibration steps is simple, can not increase the production cost of product.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is according to an embodiment of the invention for calibrating the process flow diagram of the method for the optical sensor of mobile phone;
Fig. 2 is the structural representation of the system of the optical sensor for calibrating mobile terminal of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Find that the factor affecting the calibration of optical sensor mainly contains six in the present invention: (1) chip itself is to the sensitivity of photoinduction; (2) size of resistance value; (3) impact of power supply; (4) distance of sensor photosensitive face and product casing; (5) daylighting pore size; (6) transmittance of glass.Wherein, first three factor can regard internal factor as, and the data measured in actual production process are reference data; (4) and (5) factor can be given as fixed value aborning, such as, can in mobile phone is produced given optical sensor light-sensitive surface apart from the distance of product casing, such as 4mm; And daylighting pore size, such as 2mm, calibrate according to these definite values when calibration; Last factor can regard external factor as, because the light transmission of glass is different, can have an impact to the ADC value that reality reads.
Therefore, the embodiment of the present invention proposes a kind of method and system of calibrating optical sensor according to the transmittance of glass.In the following embodiments, be described for mobile phone.It will be understood by those skilled in the art that this is only exemplary embodiment, be not used in restriction the present invention, calibration steps of the present invention can also be used for the calibration of the optical sensor of other mobile terminal.
Fig. 1 is that the method comprises the following steps according to an embodiment of the invention for calibrating the process flow diagram of the method for the optical sensor of mobile phone:
Step S101, under being placed on light source by the mobile phone comprising optical sensor.
Due to daylight lamp relatively natural light, so in one embodiment of the invention, daylight lamp preferably can be adopted as light source.
Step S102, measures the brightness value of the light be radiated on the fore shell glass of mobile terminal, and the brightness value that in record move terminal, optical sensor is measured.In order to reduce the error of calibration, can measure under different intensities of illumination and record multi-group data, and ask its mean value, then calibrating according to mean value.Owing to also needing the difference considering environment for use, in one embodiment of the invention, at least can select two kinds of intensities of illumination: a kind of is intensity of illumination under night mode, and another kind is the intensity of illumination under sunshine on daytime, such as, intensity of illumination under fine day sunshine at noon.Meanwhile, in another embodiment of the present invention, different irradiating angles can also be selected, such as, adopt vertical irradiation and close to 0 degree of two kinds of irradiating angle.Certainly also can when measuring variation illumination intensity and irradiating angle simultaneously, should be understood that above-mentioned intensity of illumination and irradiating angle are exemplary embodiment simultaneously, in addition, other intensity of illumination and irradiating angle can also be selected.In addition, in an embodiment of the present invention, the brightness value measuring the light be radiated on the fore shell glass of mobile terminal refers to be measured to the place that the Distance geometry angle of light source is equal with mobile terminal, thus improves measuring accuracy.
Step S103, the transmittance of the fore shell glass of the brightness value determination mobile terminal measured according to the brightness value on the fore shell glass of mobile terminal and optical sensor.
Particularly, the brightness value can first measured optical sensor carries out ADC measured value corresponding to brightness value that analog to digital conversion (Analog-to-Digital Convert, ADC) is measured to obtain optical sensor.Then, the mapping table of brightness value and ADC reference value is inquired about to determine ADC reference value according to the brightness value on the fore shell glass of mobile terminal.
In one particular embodiment of the present invention, as following table 1 gives the mapping table of brightness value and ADC reference value.It should be noted that, this mapping table only gives the corresponding relation between two groups of brightness values and ADC reference value, and in this mapping table, brightness value is larger, and its ADC reference value is also mutually deserved larger.The brightness value of more groups and the corresponding relation of ADC reference value can be reset, to divide brightness value data better between larger brightness value and less brightness value.This mapping table is preferred, and those skilled in the art can make equivalent amendment or change according to above-mentioned thought to following table, and these all should be included within protection scope of the present invention.
| Brightness value | ADC reference value |
| 99 | 12 |
| 1042 | 130 |
The mapping table of table 1 brightness value and ADC reference value
Finally, according to ADC reference value and ADC measured value, the transmittance of formula determination handset front case glass below can be used: the reference value of the ADC value/ADC value of transmittance=measurement.
Step S104, the transmittance according to the fore shell glass of mobile terminal is calibrated optical sensor.
For realizing above-described embodiment, the present invention also provides a kind of system of the optical sensor for calibrating mobile terminal, comprise: the mobile terminal 10 comprising optical sensor 100, light source 20, illuminance measurement device 30 and controller 40, wherein, optical sensor 100 is for measuring illuminance value, light source 20 is for irradiating mobile terminal 10, illuminance measurement device 30 is for measuring the brightness value of irradiation light on mobile terminal 10, the transmittance of the fore shell glass of the brightness value determination mobile terminal 10 that controller 40 is measured for the brightness value measured according to illuminance measurement device 30 and optical sensor 100, and according to the transmittance of the fore shell glass of mobile terminal 10, optical sensor 100 is calibrated.
In one embodiment of the invention, adopt illuminometer as illuminance measurement device 30.
In order to improve measuring accuracy, in one embodiment of the invention, make illuminance measurement device 30 equal apart from the Distance geometry angle of light source 20 with mobile terminal 10, thus under same illumination condition, measure the brightness value of light and the ADC value of mobile terminal 10 that irradiate on mobile terminal 10.
In one embodiment of the invention, controller 40 is arranged in mobile terminal 10, and certainly, controller 40 also can be the equipment be arranged on outside mobile terminal 10.
In one embodiment of the invention, this system being used for the optical sensor calibrating mobile terminal also comprises AD converter 50, AD converter 50 is connected between optical sensor 100 and controller 40, carry out ADC to the brightness value of optical sensor 100 measurement to change with ADC measured value corresponding to the brightness value obtaining optical sensor 100 measurement, and ADC measured value is sent to controller 40.AD converter 50 can be arranged in mobile terminal 10, also can be arranged on outside mobile terminal 10.Controller 40 receives the ADC measured value of AD converter 50, and the brightness value that illuminance measurement device 30 is measured is converted into ADC reference value, and the transmittance of fore shell glass according to ADC reference value and ADC measured value determination mobile terminal 10.
The impact that the transmittance that contemplated by the invention fore shell glass in actual production is calibrated optical sensor, transmittance by reference to fore shell glass is calibrated optical sensor, improve the precision of optical sensor calibration, and improve the actual usability of optical sensor, simultaneously, this calibration steps is simple, can not increase the production cost of product.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (12)
1. for calibrating a method for the optical sensor of mobile terminal, it is characterized in that, comprising the following steps:
Under the mobile terminal comprising optical sensor is placed on light source;
Measure the brightness value of the light be radiated on the fore shell glass of described mobile terminal, and record the brightness value that in described mobile terminal, described optical sensor is measured;
The brightness value measured according to the brightness value on the fore shell glass of described mobile terminal and described optical sensor determines the transmittance of the fore shell glass of described mobile terminal, wherein, the described brightness value measured according to the brightness value on the fore shell glass of mobile terminal and described optical sensor determines that the transmittance of the fore shell glass of described mobile terminal specifically comprises:
The brightness value measured described optical sensor carries out analog to digital conversion ADC with ADC measured value corresponding to the brightness value obtaining described optical sensor and measure;
Brightness value on the fore shell glass of described mobile terminal is converted into ADC reference value;
The transmittance of the fore shell glass of described mobile terminal is determined according to described ADC reference value and described ADC measured value; And
Transmittance according to the fore shell glass of described mobile terminal is calibrated described optical sensor.
2. the method for the optical sensor for calibrating mobile terminal according to claim 1, is characterized in that, describedly brightness value on the fore shell glass of described mobile terminal is converted to ADC reference value comprises further:
According to the brightness value on the fore shell glass of described mobile terminal, and the mapping table of brightness value and ADC reference value determines described ADC reference value.
3. the method for the optical sensor for calibrating mobile terminal according to claim 1, is characterized in that, determines that the transmittance of the fore shell glass of described mobile terminal comprises further according to described ADC reference value and described ADC measured value:
According to described ADC reference value and ADC measured value, determined the transmittance of the fore shell glass of described mobile terminal by following formula,
Transmittance=ADC measured value/ADC reference value.
4. the method for the optical sensor for calibrating mobile terminal according to claim 1, is characterized in that, described light source is daylight lamp.
5. the method for the optical sensor for calibrating mobile terminal according to claim 1, is characterized in that,
The transmittance of the fore shell glass of described mobile terminal is calculated respectively under at least two kinds of intensities of illumination and/or at least two kinds of irradiating angles; And
The transmittance calculated under at least two kinds of intensities of illumination and/or irradiating angle is weighted average to obtain final transmittance.
6. the method for the optical sensor for calibrating mobile terminal according to claim 5, is characterized in that, wherein, described at least two kinds of intensities of illumination comprise the intensity of illumination under night mode and day mode.
7. the method for the optical sensor for calibrating mobile terminal according to claim 5, is characterized in that, wherein, described at least two kinds of irradiating angles comprise vertical irradiation angle and horizontal irradiation angle.
8. for calibrating a system for the optical sensor of mobile terminal, it is characterized in that, comprising:
Comprise the mobile terminal of optical sensor, wherein, described optical sensor is for measuring illuminance value;
Light source, for irradiating described mobile terminal;
Illuminance measurement device, for measuring the brightness value of the light on the fore shell glass being radiated at described mobile terminal; And
Controller, brightness value for measuring according to brightness value and the described optical sensor of described illuminance measurement measurement device determines the transmittance of the fore shell glass of described mobile terminal, and calibrates described optical sensor according to the transmittance of the fore shell glass of described mobile terminal.
9. the system of the optical sensor for calibrating mobile terminal according to claim 8, is characterized in that, described illuminance measurement device is equal to the Distance geometry angle of described light source with described mobile terminal.
10. the system of the optical sensor for calibrating mobile terminal according to claim 8, is characterized in that, also comprise:
AD converter, described AD converter is connected between described optical sensor and described controller, brightness value for measuring described optical sensor carries out ADC measured value corresponding to brightness value that ADC measures to obtain described optical sensor, and described ADC measured value is sent to described controller.
The system of 11. optical sensors for calibrating mobile terminal according to claim 10, it is characterized in that, the brightness value of described illuminance measurement measurement device is converted into ADC reference value by described controller, and determines the transmittance of the fore shell glass of described mobile terminal according to described ADC reference value and described ADC measured value.
The system of the 12. described optical sensors for calibrating mobile terminal according to claim 11, it is characterized in that, described controller is according to the brightness value on the fore shell glass of described mobile terminal, and the mapping table of brightness value and ADC reference value determines described ADC reference value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103678070B (en) * | 2013-12-27 | 2018-07-17 | 上海斐讯数据通信技术有限公司 | Optical sensor calibration method, test method and the manufacturing method of mobile terminal |
| CN104589742A (en) * | 2014-12-26 | 2015-05-06 | 小米科技有限责任公司 | Device for improving light transmissivity precision and optical detection method |
| CN105651381B (en) * | 2015-12-24 | 2018-02-23 | 小米科技有限责任公司 | light sensor calibration method and device |
| CN105953915A (en) * | 2016-06-30 | 2016-09-21 | 维沃移动通信有限公司 | Calibration device and calibration method of photosensitive sensor |
| CN106802183A (en) * | 2016-11-30 | 2017-06-06 | 努比亚技术有限公司 | A kind of photosensitive sensors calibration method and terminal |
| CN109283192A (en) * | 2018-11-20 | 2019-01-29 | 苏州精濑光电有限公司 | Illumination auto-correction method, apparatus and system |
| CN110660087B (en) * | 2019-08-16 | 2022-05-13 | 深圳市万普拉斯科技有限公司 | Light sensation correction method and device, electronic equipment and storage medium |
| CN110827349B (en) * | 2019-11-14 | 2023-06-23 | 广东小天才科技有限公司 | Calibration method, system, computer equipment and storage medium |
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| CN101793552A (en) * | 2009-02-03 | 2010-08-04 | 罗姆股份有限公司 | Optical sensor, object detection device and disk device using the same |
| CN102042872A (en) * | 2010-09-05 | 2011-05-04 | 苏州佳世达电通有限公司 | Adjustment system and adjustment method of sensing range of ambient light sensor |
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| CN101558292A (en) * | 2006-12-14 | 2009-10-14 | 日本电气硝子株式会社 | Glass sheet defect detection device, glass sheet manufacturing method, glass sheet, glass sheet quality judging device, and glass sheet inspection method |
| CN101793552A (en) * | 2009-02-03 | 2010-08-04 | 罗姆股份有限公司 | Optical sensor, object detection device and disk device using the same |
| CN102042872A (en) * | 2010-09-05 | 2011-05-04 | 苏州佳世达电通有限公司 | Adjustment system and adjustment method of sensing range of ambient light sensor |
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