CN105719618A - Method for saving energy by means of automatically adjusting brightness of mobile phone screen - Google Patents
Method for saving energy by means of automatically adjusting brightness of mobile phone screen Download PDFInfo
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- CN105719618A CN105719618A CN201610191508.3A CN201610191508A CN105719618A CN 105719618 A CN105719618 A CN 105719618A CN 201610191508 A CN201610191508 A CN 201610191508A CN 105719618 A CN105719618 A CN 105719618A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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Abstract
The invention discloses a method for saving energy by means of automatically adjusting brightness of a mobile phone screen.The method comprises the following steps that 1, a light intensity sensor is used for detecting surroundings and outputting a voltage signal; 2, a brightness adjusting control unit collects the voltage signal output by the light intensity sensor and processes the voltage signal to obtain the environment light intensity, and a current brightness value of the mobile phone screen is calculated according to a set brightness model; 3, the brightness value is sent to the mobile phone screen through an ARINC-429 bus, and the mobile phone screen receives and analyzes the brightness value and gives out backlight brightness corresponding to the brightness value.According to the method for saving the energy by means of automatically adjusting the brightness of the mobile phone screen, the light intensity sensor detects light changes of the surroundings, the target mobile phone screen brightness is calculated according to the mobile phone screen brightness model, and the current mobile phone screen brightness is adjusted on the basis of bright and dark adaptation curves of human eyes, and it is guaranteed that the mobile phone screen brightness change is mild and uniform.
Description
Technical field
The present invention relates to screen intensity automatic adjustment technology field, be specifically related to a kind of power-economizing method being automatically adjusted screen luminance of mobile phone.
Background technology
Liquid crystal display has goed deep in our everyone life now, brings challenge also to while in this our eyes, and therefore we need the display of more hommization, and the research of this problem accords with the demands of the market just.When you are immersed in computer game, office work, TV programme etc. completely when, we usually forget the disappearance of time, and the light around us changes as well as rising in east and drop in west of the sun certainly.Therefore we need the brightness changed to adapt to our eyes, alleviate visual fatigue, have the most also reached the call of energy-conserving and environment-protective.People will constantly pursue more comfortable life style, and liquid crystal display indispensable flavoring agent in living exactly, so can automatic regulating lightness be very promising research direction according to changing of external environment.This problem can also derive to being automatically adjusted contrast, colorfulness etc..
At present, liquid crystal display is widely used to the multiple fields such as mobile phone, computer, advertisement screen, auto meter.Along with the progress of science and technology, liquid crystal display performance has a very big improvement, but still Shortcomings.Investigation finds, the place that available liquid crystal display is the most to be improved in terms of brightness regulation, and when backlight illumination is inharmonious with environmental light intensity, human eye will produce visual fatigue, and human eyesight will be caused irreversible damage by this fatigue.And the too high meeting of screen intensity directly affects the service life of mobile phone screen；The too low mobile phone screen display effect that affects again, in actual use, when bias light intensity generation acute variation when, liquid crystal interface figure often cannot bring inconvenience to user for the identification of human eye institute.Manually regulation the most not science to liquid crystal brightness.Therefore, brightness regulation becomes the function that mobile phone screen display is necessary.
Employing photoconductive resistance regulates, and there are two shortcomings: l) temperature influence is big, and under different room temperatures, the data collected have difference；2) response speed is slow, and time delay is relevant to the complexity of coupled circuit.If directly using photodiode, then need with amplifying circuit and A/D converter with the use of, while system design increases complexity, also induced one unnecessary error.
Summary of the invention
For problem above, the invention provides a kind of power-economizing method being automatically adjusted screen luminance of mobile phone, light change with optical sensor detection environment, mobile phone screen object brightness is calculated according to screen luminance of mobile phone model, and, dark adaptation curve regulation mobile phone screen present intensity bright according to human eye, ensure that screen luminance of mobile phone changes soft, uniform, can effectively solve the problem in background technology.
To achieve these goals, the technical solution used in the present invention is as follows: a kind of power-economizing method being automatically adjusted screen luminance of mobile phone, comprises the steps:
(1) by optical sensor detection surrounding output voltage signal；
(2) gathered the voltage signal of output of optical sensor by brightness regulation control unit, and process this some signal and obtain ambient light illumination, calculate, according to the Intensity model set, the brightness value that mobile phone screen is current；
(3) brightness value is sent to mobile phone screen by ARINC-429 bus, after mobile phone screen reception, parsing brightness value, provides backlight illumination corresponding with brightness value；
The core devices of described optical sensor is photodiode, and when unglazed irradiation, the dark current that photodiode produces is the least, the output voltage of optical sensor is relatively low, when being irradiated by light, the electric current that photodiode produces increases therewith, and the output voltage of optical sensor raises accordingly；If its receiving plane of optical sensor that area is S, luminous flux is Φ is considered preferable diffusing scattering face, luminous intensity is the point source of I when being radiated on optical sensor, and on optical sensor, average illumination E is:
In formula, d Φ is the luminous flux on bin dS, the solid angle that point source is opened by dw by bin dS, and θ is angle between bin normal and irradiation light, and l is bin and point source spacing.
Described brightness regulation control unit is brilliance control assembly, is arranged on interior of mobile phone, and the analog input voltage signal circuit after filtering of optical sensor, amplifying circuit and overvoltage crowbar enter the ADC sampling channel of dsp system after processing；Described dsp system connects EEPROM, watchdog circuit, 429 EBIs and RS232 interface.
Described brightness regulation control unit is by RS232 interface and outside interaction data, and brightness regulation control unit identifies connection status automatically, when after successful connection, then preparing to update brilliance control model data.
Described filter circuit is made up of input second-order filter network R27, R28, R40, U2B, C5, C6, plays voltage follow isolation, the function of second-order filter, wherein R27=R28=1K, C5=C6=100nF；R30, C7 constitute first-order filtering network, choose R30=10K, C7=10nF, are allowed to the time constant identical with second-order filter network, and U2C constitutes voltage follower, and R12, D3 constitute mu balanced circuit, limit output voltage without departing from 5.1V.
Beneficial effects of the present invention:
The present invention detects the light change of environment with optical sensor, calculates mobile phone screen object brightness, and, dark adaptation curve regulation mobile phone screen present intensity bright according to human eye according to screen luminance of mobile phone model, it is ensured that it is soft, uniform that screen luminance of mobile phone changes.
Accompanying drawing explanation
Fig. 1 is brightness regulation control unit theory diagram of the present invention.
Fig. 2 is optical sensor internal circuit diagram of the present invention.
Fig. 3 is the circuit diagram of amplifying circuit of the present invention.
Fig. 4 is the circuit diagram of ADC sampling channel of the present invention.
Fig. 5 is the circuit diagram of dsp system of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment:
Referring to figs. 1 through shown in Fig. 5, a kind of power-economizing method being automatically adjusted screen luminance of mobile phone, comprise the steps:
(1) by optical sensor detection surrounding output voltage signal；
(2) gathered the voltage signal of output of optical sensor by brightness regulation control unit, and process this some signal and obtain ambient light illumination, calculate, according to the Intensity model set, the brightness value that mobile phone screen is current；
(3) brightness value is sent to mobile phone screen by ARINC-429 bus, after mobile phone screen reception, parsing brightness value, provides backlight illumination corresponding with brightness value；
ARINC-429 bus has the advantages such as interface is convenient, reliability is high, capacity of resisting disturbance is strong.
The core devices of described optical sensor is photodiode, and when unglazed irradiation, the dark current that photodiode produces is the least, the output voltage of optical sensor is relatively low, when being irradiated by light, the electric current that photodiode produces increases therewith, and the output voltage of optical sensor raises accordingly；If its receiving plane of optical sensor that area is S, luminous flux is Φ is considered preferable diffusing scattering face, luminous intensity is the point source of I when being radiated on optical sensor, and on optical sensor, average illumination E is:
In formula, d Φ is the luminous flux on bin dS, the solid angle that point source is opened by dw by bin dS, and θ is angle between bin normal and irradiation light, and l is bin and point source spacing.
Described brightness regulation control unit is brilliance control assembly, is arranged on interior of mobile phone, and the analog input voltage signal circuit after filtering of optical sensor, amplifying circuit and overvoltage crowbar enter the ADC sampling channel of dsp system after processing；Described dsp system connects EEPROM, watchdog circuit, 429 EBIs and RS232 interface.
Described brightness regulation control unit is by RS232 interface and outside interaction data, and brightness regulation control unit identifies connection status automatically, when after successful connection, then preparing to update brilliance control model data.
Described filter circuit is made up of input second-order filter network R27, R28, R40, U2B, C5, C6, plays voltage follow isolation, the function of second-order filter, wherein R27=R28=1K, C5=C6=100nF；R30, C7 constitute first-order filtering network, choose R30=10K, C7=10nF, are allowed to the time constant identical with second-order filter network, and U2C constitutes voltage follower, and R12, D3 constitute mu balanced circuit, limit output voltage without departing from 5.1V.
Automatic brightness adjustment principle:
When screen luminance of mobile phone is automatically adjusted, after ambient light illumination being detected by optical sensor, mobile phone screen objects brightness under current environment illuminance is determined according to screen luminance of mobile phone Controlling model, then according to human eye is bright, dark adaptation curve regulation mobile phone screen present intensity, wherein screen luminance of mobile phone Controlling model and be the key that screen luminance of mobile phone is automatically adjusted according to human eye light dark adaptation curve adjustment brightness.
Screen luminance of mobile phone Controlling model defines ambient light illumination and screen luminance of mobile phone corresponding relation, and this brilliance control model is set up by the experiment of vision work efficiency.The theoretical basis of vision ergonomics evaluation is Weber Fechner law, and Weber Fechner law gives human eye when being stimulated by some, the relation between human eye brightness and light-source brightness.Brightness F of human eye is directly proportional to the logarithm of light-source brightness B:
F=KlgB+K0
Wherein K0 with K is the constant relevant with surrounding brightness.During different brightness B, the minimum light source brightness flop that human eye can be discovered obtains Δ Bmin and depends on that relative luminance changes.Perceptible minimum relative luminance changes delta Bmin/B of human eye is referred to as contrast sensitivity threshold, represents with δ, and its value is generally between 0.005～0.05.During the experiment of vision work efficiency, simulated solar light source forms the ambient light that illumination is different, ambient light illumination is changed with geometric ratio relation according to Weber Fechner law, when a certain ambient light illumination, by sighting target on user interpretation mobile phone screen, if watching comfortable, then it is assumed that current phone screen intensity is comfortable brightness.
The Changing Pattern of screen luminance of mobile phone when environment is entered dark situation by bright ring border or entered bright ring border by dark situation is defined according to human eye light dark adaptation curve adjustment brightness.When entering into dark situation from bright ring border, within a period of time, crew can't see completely or is hardly visible visual object, after a while, along with the rising of vision sensitivity gradually can see visual object, last Visual Observations Observations reaches stable and clear, the rising of this visual system sensitivity is referred to as dark adaptation, on the contrary, the phenomenon that visual system sensitivity declines during dark situation enters into bright ring border is referred to as brightness adaptation, although human visual system adapts to the bright dark change of luminous environment brightness, but the length of light dark adaptation time depends on the magnitude of brightness flop, luminance difference is the biggest, adaptive time is the longest.
The software of screen luminance of mobile phone automatic regulating system is brightness regulation control unit software, and brightness regulation control unit software loading is in brilliance control assembly；Mainly comprise the following steps:
(1) program initialization, initialization time variable T, TN, T is the persistent period of ambient light change, and TN is the time of last brightness flop, and T, TN are set to present system time；
(2) gather optical sensor signal, read sensor values on mobile phone screen, it is determined that current environment illuminance, according to screen luminance of mobile phone Controlling model, determine mobile phone screen present intensity, change screen luminance of mobile phone simultaneously.Screen luminance of mobile phone Controlling model defines the corresponding relation between ambient light illumination and screen luminance of mobile phone；
(3) update ambient light illumination, read sensor values on mobile phone screen, update current environment illuminance value；
(4) update object brightness, by current environment illuminance value, according to screen luminance of mobile phone Controlling model, obtain mobile phone screen object brightness；
(5) judging object brightness and the identity property of present intensity, if object brightness and present intensity are equal, then update time variable T, TN, screen luminance of mobile phone is constant, returns step (3)；Otherwise forward step (6) to；
(6) comparison object brightness and the size of present intensity, if object brightness is more than present intensity, then increases present intensity, and returns step (3), if object brightness is less than present intensity, then reduces present intensity, and returns step (3).
Wherein in step (6), if object brightness is more than present intensity, calculates object brightness and the difference of present intensity, luminance difference calculate present intensity and transform to the time TU needed for object brightness；Update time variable TN, and calculate difference DELTA T of time variable T and time variable TN.If Δ T ＞ TU, increase present intensity according to human eye brightness adaptation curve table, and change screen luminance of mobile phone according to present intensity, update time variable T, TN simultaneously, return step (3)；If Δ T ＜ TU, updating time variable TN, screen luminance of mobile phone is constant, returns step (3)；
If object brightness is less than present intensity, calculates present intensity and the difference of object brightness, luminance difference calculate present intensity and transform to the time TU needed for object brightness；Update time variable TN, and calculate difference DELTA T of time variable T and time variable TN.If Δ T ＞ TU, reduce present intensity according to human eye dark adaptation curve table, and change screen luminance of mobile phone according to present intensity, update time variable T, TN simultaneously, return step (3)；If Δ T ＜ TU, updating time variable TN, screen luminance of mobile phone is constant, returns step (3).
Based on above-mentioned, it is an advantage of the current invention that, the present invention is with the light change of optical sensor detection environment, mobile phone screen object brightness is calculated according to screen luminance of mobile phone model, and, dark adaptation curve regulation mobile phone screen present intensity bright according to human eye, it is ensured that it is soft, uniform that screen luminance of mobile phone changes.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (5)
1. the power-economizing method being automatically adjusted screen luminance of mobile phone, it is characterised in that comprise the steps:
(1) by optical sensor detection surrounding output voltage signal；
(2) gathered the voltage signal of output of optical sensor by brightness regulation control unit, and process this some signal and obtain ambient light illumination, calculate, according to the Intensity model set, the brightness value that mobile phone screen is current；
(3) brightness value is sent to mobile phone screen by ARINC-429 bus, after mobile phone screen reception, parsing brightness value, provides backlight illumination corresponding with brightness value.
A kind of power-economizing method being automatically adjusted screen luminance of mobile phone the most according to claim 1, it is characterized in that, the core devices of described optical sensor is photodiode, when unglazed irradiation, the dark current that photodiode produces is the least, and the output voltage of optical sensor is relatively low, when being irradiated by light, the electric current that photodiode produces increases therewith, and the output voltage of optical sensor raises accordingly；If its receiving plane of optical sensor that area is S, luminous flux is Φ is considered preferable diffusing scattering face, luminous intensity is the point source of I when being radiated on optical sensor, and on optical sensor, average illumination E is:
In formula, d Φ is the luminous flux on bin dS, the solid angle that point source is opened by dw by bin dS, and θ is angle between bin normal and irradiation light, and l is bin and point source spacing.
A kind of power-economizing method being automatically adjusted screen luminance of mobile phone the most according to claim 1; it is characterized in that; described brightness regulation control unit is brilliance control assembly; being arranged on interior of mobile phone, the analog input voltage signal circuit after filtering of optical sensor, amplifying circuit and overvoltage crowbar enter the ADC sampling channel of dsp system after processing；Described dsp system connects EEPROM, watchdog circuit, 429 EBIs and RS232 interface.
4. according to a kind of power-economizing method being automatically adjusted screen luminance of mobile phone described in claim 1 or 3, it is characterized in that, described brightness regulation control unit is by RS232 interface and outside interaction data, brightness regulation control unit identifies connection status automatically, when after successful connection, then preparing to update brilliance control model data.
A kind of power-economizing method being automatically adjusted screen luminance of mobile phone the most according to claim 3, it is characterized in that, described filter circuit is made up of input second-order filter network R27, R28, R40, U2B, C5, C6, play voltage follow isolation, the function of second-order filter, wherein R27=R28=1K, C5=C6=100nF；R30, C7 constitute first-order filtering network, choose R30=10K, C7=10nF, are allowed to the time constant identical with second-order filter network, and U2C constitutes voltage follower, and R12, D3 constitute mu balanced circuit, limit output voltage without departing from 5.1V.
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| CN107911919A (en) * | 2017-11-08 | 2018-04-13 | 珠海格力电器股份有限公司 | A kind of control device of remote controler, method, storage medium, remote controler and equipment |
| CN110073432A (en) * | 2016-12-14 | 2019-07-30 | 三星电子株式会社 | Display device and its seam bearing calibration |
| CN110223659A (en) * | 2019-07-18 | 2019-09-10 | 福建晶彩光电科技股份有限公司 | It is a kind of for control include pixel active matrix display screen brightness method |
| CN113424135A (en) * | 2019-01-03 | 2021-09-21 | 广东夏野日用电器有限公司 | Self-adaptive adjusting method based on environment light distribution field |
| CN113665479A (en) * | 2021-08-30 | 2021-11-19 | 北斗星通智联科技有限责任公司 | Backlight brightness adjusting system and method for in-vehicle instrument, in-vehicle instrument and vehicle |
| CN113808545A (en) * | 2021-08-23 | 2021-12-17 | 中车南京浦镇车辆有限公司 | Backlight control method for front-end destination display of metro vehicle |
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| CN117475806A (en) * | 2023-12-28 | 2024-01-30 | 深圳康荣电子有限公司 | Display screen self-adaptive response method and device based on multidimensional sensing data feedback |
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| CN110073432A (en) * | 2016-12-14 | 2019-07-30 | 三星电子株式会社 | Display device and its seam bearing calibration |
| CN107911919A (en) * | 2017-11-08 | 2018-04-13 | 珠海格力电器股份有限公司 | A kind of control device of remote controler, method, storage medium, remote controler and equipment |
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| CN113424135B (en) * | 2019-01-03 | 2023-01-10 | 广东夏野日用电器有限公司 | Self-adaptive adjusting method based on environment light distribution field |
| CN110223659A (en) * | 2019-07-18 | 2019-09-10 | 福建晶彩光电科技股份有限公司 | It is a kind of for control include pixel active matrix display screen brightness method |
| CN113808545A (en) * | 2021-08-23 | 2021-12-17 | 中车南京浦镇车辆有限公司 | Backlight control method for front-end destination display of metro vehicle |
| CN113665479A (en) * | 2021-08-30 | 2021-11-19 | 北斗星通智联科技有限责任公司 | Backlight brightness adjusting system and method for in-vehicle instrument, in-vehicle instrument and vehicle |
| WO2023122879A1 (en) * | 2021-12-27 | 2023-07-06 | 京东方科技集团股份有限公司 | Backlight control circuit, control method therefor, and display device |
| CN117475806A (en) * | 2023-12-28 | 2024-01-30 | 深圳康荣电子有限公司 | Display screen self-adaptive response method and device based on multidimensional sensing data feedback |
| CN117475806B (en) * | 2023-12-28 | 2024-03-29 | 深圳康荣电子有限公司 | Display screen self-adaptive response method and device based on multidimensional sensing data feedback |
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