CN102137178A - Mobile phone backlight control method - Google Patents
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Abstract
The invention relates to a mobile phone backlight control method which comprising the steps of triggering a sensor or a camera on a mobile phone to detect current environment luminance brightness according to an incoming call event or a key action event; adjusting a luminance value of a screen of the mobile phone according to the environment luminance brightness, wherein the higher the environment luminance brightness is, the higher the luminance value of the screen of the mobile phone is; and adjusting a display image of the screen of the mobile phone according to the environment luminance brightness, wherein the high the environment luminance brightness is, the higher an adjusting value is, and the adjusting value comprises a contrast adding value to low brightness pixel and a contrast lowering value to high brightness pixel. According to the mobile phone backlight control method, ambient light induction and image gray scale processing are merged together, ambient light, the display screen, backlight of the display screen and backlight of a keyboard are designed into a system, and the dynamic control of the system is conducted by a multipath and efficient adjusting method, so that the power consumption of the backlight is reduced to the largest extent on the premise of not influencing display effect and improving the experience of a user.
Description
Technical field
The present invention relates to the battery of mobile phone energy conservation, be specifically related to a kind of mobile phone method for controlling backlight thereof.
Background technology
At present, mobile telephone power consumption has become the bottleneck problem of mobile phone technique and functional promotion.Be accompanied by enriching constantly and strengthening of function, also step by step the increase of the power consumption of mobile phone, however the electric power storage ability of battery of mobile phone does not but have substantial raising in recent years, thus cause the flying power of mobile phone to highlight deficiency, therefore, the importance of the Low-power Technology of mobile phone becomes increasingly conspicuous.And as the important power consumption factor of mobile phone, the reduction of consumption backlight also has significance.
Summary of the invention
The technical issues that need to address of the present invention are, how a kind of mobile phone method for controlling backlight thereof is provided, and can reduce the mobile phone backlight power consumption to greatest extent under the prerequisite that does not influence the display screen effect.
Technical problem of the present invention solves like this: make up a kind of mobile phone method for controlling backlight thereof, may further comprise the steps:
Detect current environmental light brightness by transducer on incoming call incident or the actuation of keys Event triggered mobile phone or camera;
According to described environmental light brightness size adjustment mobile phone screen brightness value: environmental light brightness is big more, the mobile phone screen brightness value is high more;
Adjust the mobile phone screen display image according to described environmental light brightness size: environmental light brightness is big more, adjusted value is high more, and described adjusted value comprises to the contrast added value of low-light level pixel or to the contrast reduction value of high brightness pixel.
According to control method provided by the invention, except that incoming call incident or actuation of keys incident, also include, but are not limited to: detect current environmental light brightness by transducer or the camera that comes short message event to trigger on the mobile phone.
According to control method provided by the invention, also comprise the processing backlight to cell phone keyboard, specifically include, but are not limited to following two kinds of schemes:
㈠ changes the cell phone keyboard backlight brightness values according to described environmental light brightness size: environmental light brightness is big more, the cell phone keyboard backlight brightness values is low more;
Wherein: described cell phone keyboard backlight brightness values includes, but are not limited to adopt the duty ratio of the pulse width modulation of corresponding mobile phone CPU output to control;
㈡ is lower than the keyboard back light thresholding according to described environmental light brightness size, and to light cell phone keyboard backlight, otherwise the cell phone keyboard that goes out is backlight, and described cell phone keyboard thresholding backlight is the steady state value that the user can set in advance.
According to control method provided by the invention, described display backlight is regulated the function that includes, but are not limited to adopt corresponding following two kinds of situations:
㈠ approximately linear function
C=1/(2-M
(B?-1))+kA；
㈡ exponential form function
C=1/(2-M
(B-kA-1))，
Wherein M is the abscissa of grey scale transformation point, and C is the multiple of display backlight brightness with respect to original intensity, and A is an intensity information, and B is a mode of operation, and k is the light intensity susceptibility of display backlight.
According to control method provided by the invention, the adjustment of described mobile phone screen display image includes, but are not limited to adopt the function of corresponding following two kinds of situations:
㈠ only surround lighting regulates
Y?=?-X
(A+1)?+?2X，
㈡ contains GTG to be handled
Y?=?-X
(A+2)+?2X；
Wherein X is certain the picture element grey scale normalization value before the conversion, and Y is certain the picture element grey scale normalization value after the conversion, and A is an intensity information.
According to control method provided by the invention, it is as follows that the present invention solves the logic module that its technical problem adopts: illuminant module, processor module, the data conversion submodule, display screen, display backlight control module, the display backlight module, keyboard back light control module, keyboard back light module.
In the such scheme, the backlight control flow process is as follows:
1. at first processor module is judged user's setting:
When backlight being set to " only surround lighting regulate brightness function ", processor control data transformation submodule is not carried out GTG to view data and is handled, and directly is transferred to display screen.Contain when operation this moment: incoming call, receive note, and there is button to press, when display screen is lighted and is waited, the triggering illuminant module, and gather light intensity data to the frequency of 25Hz from illuminant module with 5Hz, enter step 2 then.
When backlight being set to " closed adjusting backlight " or when " only reducing picture quality ", processor is locked as median with light intensity data, to cancel its regulating effect.Contain when operation this moment: incoming call, receive note, and there is button to press, when display screen is lighted etc., do not trigger illuminant module, enter step 2 then.
When backlight being set to " full-automatic adjusting backlight ", when operation contains: incoming call, receive note, there is button to press, display screen is lighted when waiting, the triggering illuminant module, and gather light intensity data to the frequency of 25Hz from illuminant module with 5Hz, enter step 2 then.
2. the transmitting and displaying data time, processor is handled respectively light intensity signal, be transferred to data conversion submodule and keyboard back light control module then respectively, and then send corresponding switch control data respectively to display backlight control module and keyboard back light control module.The setting of analysis user, at " closing adjusting backlight ", " only surround lighting is regulated the brightness function ", and " only reducing picture quality ", " full-automatic adjusting backlight " 4 kinds of mode of operations, the working method of control data transformation submodule enters step 3.
3. the data conversion submodule carries out conversion to video data, exports to display screen then and shows, generates data simultaneously and is transferred to the display backlight control module.Enter step 4.
4. display backlight control module and keyboard back light control module are handled the data that receive, and control display screen backlight module and keyboard back light module cut-offs with bright dark respectively.
In the such scheme, the control law of display screen is as follows:
When receiving video data, the GTG contrast of video data is carried out certain raising, with the light intensity data of receiving the GTG contrast is once adjusted again then.The adjustment mode is: if light is stronger, light intensity data is bigger, then contrast is turned down; If light a little less than, light intensity data is less, then contrast is heightened.
In the such scheme, display backlight control module regular as follows:
Receive data C as the brightness reference, the C value is big more, and backlight bright more, the C value is more little, and backlight dark more, vice versa.The data that CPU transmits are only controlled backlight whether lighting.
In the such scheme, keyboard back light control module regular as follows:
The bright dark and switch that the Data Control that CPU transmits is backlight.Can be the PWM waveshape, duty ratio is high more, and keyboard back light is bright more; Duty ratio is low more, and keyboard back light is low more, and vice versa.
Mobile phone method for controlling backlight thereof provided by the invention, integrated environment photoinduction and image gray-scale level are handled, amplitude peak reduces backlight power consumption, further surround lighting, display screen, display backlight and keyboard back light are designed to a system, adopt multichannel and efficiently regulative mode system is dynamically controlled, thereby when reducing backlight power consumption, do not influence display effect, improve user's experience.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is a mobile phone backlight control system high-level schematic functional block diagram of the present invention;
Fig. 2 is the control program schematic flow sheet of illuminant module among Fig. 1;
Fig. 3 is the master control program schematic flow sheet of CPU among Fig. 1;
Fig. 4 is the control program schematic flow sheet of display screen driver module among Fig. 1;
Fig. 5 is the control program schematic flow sheet of display backlight control module among Fig. 1;
Fig. 6 is the control program schematic flow sheet of keyboard back light control module among Fig. 1.
Embodiment
At first, total system of the present invention is described:
As Fig. 1, mobile phone backlight control system of the present invention comprises following functional module:
The ㈠ processor
Operation and setting according to the user, in needs, read light intensity data from sensor devices with certain frequency, in conjunction with backlight whether needs of user's Operations Analyst display screen and keyboard open then, generate multichannel data and control signal after the integrated treatment, be transferred to the display screen driver module respectively, the display backlight control module, the keyboard back light control module.
㈡ display screen driver module
The data conversion submodule is according to the data A that receives in the display screen driver module, and the GTG of video data is carried out a kind of conversion process, afterwards the display data transmissions after the conversion shown to display screen.Generate data C simultaneously and pass to the display backlight control module.
㈢ display backlight control module
According to the data that CPU and data conversion submodule transmit, handle back control display screen backlight module and adjust display backlight brightness;
Receive data C as the brightness reference, the C value is big more, and backlight bright more, the C value is more little, and backlight dark more, vice versa.The data that CPU transmits are only controlled backlight whether lighting.
㈣ keyboard back light control module
According to data and the control signal that CPU transmits, the supervisory keyboard backlight module is adjusted keyboard back light brightness.
The second, control program of the present invention is described:
The control program of ㈠ illuminant module of the present invention as shown in Figure 2, comprises following steps:
Does S201:CPU instruct arrival? whether judge CPU from the illuminant module reading of data,, otherwise continue to carry out S201 if receive the instruction of reading then carry out S202;
S202: gather surround lighting and generate light intensity data, send it to processor.Carry out S201 then.
The master control program of ㈡ CPU of the present invention as shown in Figure 3, comprises following steps:
S301: judge whether to read the illuminant module light intensity data, need read and then carry out S302, otherwise carry out S301-3;
S301-3: the locking light intensity data is in moderate value.Its effect is to make light intensity data ineffective treatment in the processing of back, by data A is locked as 0, make its in the back the influence in the computing can ignore.
S302: the frequency with 5Hz-25Hz reads light intensity data from illuminant module.This frequency adjustable,, when underfrequency may make image change the ladder sense strong excessively, frequency is too high can to reduce operating efficiency, serves as reasonable with 5 Hz-25Hz.
S303: the light intensity data that obtains is handled respectively.Processing procedure need be current to the user operation, state, and the information such as be provided with of mobile phone is analyzed, and then in conjunction with light intensity data, at the data conversion submodule, the display backlight control module, the keyboard back light control module calculates corresponding data respectively.
S304: the data A after will handling is transferred to data processing module.Data A is obtained by the light intensity data linear transformation, and luminous intensity is low more, and this value is low more, and luminous intensity is big more, and this value is big more.This value will exert an influence to the conversion curve of video data at the data conversion submodule.
S305: the switch control data of display screen is transferred to the display backlight control module.
S306: the backlight brightness data and the switch control data of keyboard are transferred to the keyboard back light control module.The environmental light brightness size is lower than the keyboard back light thresholding, and to light cell phone keyboard backlight, otherwise the cell phone keyboard that goes out is backlight, and described cell phone keyboard thresholding backlight is the steady state value that the user can set in advance.Be lower than in the environmental light brightness size under the condition of keyboard back light thresholding, environmental light brightness is big more, and backlight illumination is more little, and environmental light brightness is low more, and backlight illumination is high more.
S307: display data transmissions is given data processing module and handled other tasks.
S308: the luminous intensity that whether needs to carry out is next time sampled.Then carry out S301 if desired, otherwise carry out S307.
Data conversion submodule program in the ㈢ display screen driver module of the present invention as shown in Figure 4, comprises following steps:
Does S401: video data arrive? if receive video data, then carry out S402, otherwise carry out S401;
S402: binding data A carries out grey scale transformation to video data.The flow process of conversion is as follows:
Add up its normalized pixel brightness histogram according to the video data that receives.The minimum brightness of pixel is 0, and maximum brightness is 1.According to pixel brightness sequence arrangement pixel from low to high, calculate the brightness maximum in preceding 90% the picture element, be designated as M, its implication is the abscissa of grey scale transformation point.90% scalable of using in the calculating;
According to the data A that reads, determine conversion curve then.Conversion curve has various ways, and what the present invention adopted is index functional form conversion curve, and form is: Y=-X
(A+B)+ 2X, wherein X is certain the picture element grey scale normalization value before the conversion, Y is certain the picture element grey scale normalization value after the conversion.This form curve is through (0,0), (1,1) point, satisfy basic normalization grey scale transformation condition, this curve is an exponential curve simultaneously, is to realize one of important function form that dynamic backlight is regulated, and the A value is the data A that CPU transmits in the formula, implication is an intensity information, its the value (q, q) between, 0＜q＜0.5.Q increases, and then A increases the influence of grey scale transformation; Q reduces, and then A reduces the influence of grey scale transformation.The concrete value of q need be debugged, and what it was expressed is the strength of adjustment of luminous intensity to this index grey scale transformation curve.When ambient light intensity increased, the A value increased, and when ambient light intensity reduced, the A value reduced.If light sensation is not regulated and opened, when promptly the user was set to " closing adjusting backlight " or " only reducing picture quality ", the A value was locked as 0.B value implication is a mode of operation, and when the user was set to " only reducing picture quality " or " full-automatic adjusting backlight ", the B value was 2.Reason is when A=0, and no light sensation is regulated, and only have grey scale transformation this moment, and the grey scale transformation curve needs the form of quadratic function, so the B value is set at 2.When the user was set to " closing adjusting backlight " or " only surround lighting is regulated the brightness function ", the B value was 1, and this moment, the grey scale transformation curve of video data only was subjected to ambient light effects;
After determining conversion curve, need to determine change point.Make X=M, substitution curve Y=-X
(A+B)Among+the 2X, the Y value that obtains is set at N.Obtain change point (M, N);
Determine final GTG mapping curve then.Straight line connects (0,0) and (M N) obtains curve a, and (M, N), (1,1) obtains curve b in the straight line connection.Curve a, b are exactly final GTG mapping curve;
To carry out grey scale transformation to video data at last.For the pixel of X value less than M, a is converted into Y by curve; For the pixel of X value greater than M, b is converted into Y by curve.The Y value that obtains according to this kind method is an approximation;
After it should be noted that each time the GTG mapping curve is determined, can use in the video data of next a frame or multiframe, this can fix also can be according to user's demand setting.
S403: the video data after will handling is exported to display screen and is shown.
S404: dateout C gives the display backlight control module.Carry out S401 then;
The implication of C is the multiple of display backlight brightness with respect to original intensity.Consider that operand is bigger, adjusting parameter dateout C backlight does not adopt the exponent arithmetic form in the present invention, and formula of index is C=1/ (2-M
(B-kA-1)), but adopt linear approximation to calculate.Linear computing formula: C=1/ (2-M
(B-1))+kA, wherein 1/ (2-M
(B-1)) be the brightness regulation of making for the GTG adjustment that cooperates video data partly, kA cooperates ambient light intensity to change and the linear regulation amount of introducing, 0＜k＜1 wherein, implication is the light intensity susceptibility of display backlight, represents the reaction sensitivity that ambient light intensity is changed backlight.Its value is big more, and backlight illumination is subjected to ambient light effects big more; Its value is more little, and backlight illumination is subjected to ambient light effects more little.This value can be set in user interface, makes light sensation that control more flexibly can be provided.Compare exponential transform simultaneously, adopt linear function to also have a benefit, have bigger brightness regulation scope, backlightly under dark surrounds can reach darker degree; Under the high light environment, backlightly can significantly promote brightness, enough brightness supports are provided.
The control program of ㈣ display backlight control module of the present invention as shown in Figure 5, comprises following steps:
Does S501: the switch control command arrive or data C arrives? if have order or data to arrive, then carry out S502, otherwise carry out S501;
S502: regulate display backlight brightness by the control display screen backlight module.Carry out S501 then.
The control program of ㈤ keyboard back light control module of the present invention as shown in Figure 6, comprises following steps:
Does S601: the switch control command arrive or the keypad brightness data arrive? if have order or data to arrive, then carry out S602, otherwise carry out S601;
S602: regulate the keyboard backlight illumination by the supervisory keyboard backlight module.Carry out S601 then.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to the covering scope of claim of the present invention.
Claims (9)
1. a mobile phone method for controlling backlight thereof is characterized in that, may further comprise the steps:
Detect current environmental light brightness by transducer on incoming call incident or the actuation of keys Event triggered mobile phone or camera;
According to described environmental light brightness size adjustment mobile phone screen brightness value: environmental light brightness is big more, the mobile phone screen brightness value is high more;
Adjust the mobile phone screen display image according to described environmental light brightness size: environmental light brightness is big more, adjusted value is high more, and described adjusted value comprises to the contrast added value of low-light level pixel or to the contrast reduction value of high brightness pixel.
2. according to the described control method of claim 1, it is characterized in that, also comprise: detect current environmental light brightness by transducer or the camera that comes short message event to trigger on the mobile phone.
3. according to the described control method of claim 1, it is characterized in that, also comprise: change the cell phone keyboard backlight brightness values according to described environmental light brightness size: environmental light brightness is big more, the cell phone keyboard backlight brightness values is low more.
4. according to the described control method of claim 3, it is characterized in that the duty ratio of the pulse width modulation of the corresponding mobile phone CPU output of described cell phone keyboard backlight brightness values.
5. according to the described control method of claim 3, it is characterized in that, also comprise: being lower than the keyboard back light thresholding according to described environmental light brightness size, to light cell phone keyboard backlight, otherwise the cell phone keyboard that goes out is backlight, and described cell phone keyboard thresholding backlight is the steady state value that the user can set in advance.
6. according to the described control method of claim 1, it is characterized in that the described exponential form function of regulating correspondence is: C=1/ (2-M
(B-kA-1)), wherein M is the abscissa of grey scale transformation point, and C is the multiple of display backlight brightness with respect to original intensity, and A is an intensity information, and B is a mode of operation, k is the light intensity susceptibility of display backlight.
7. according to the described control method of claim 1, it is characterized in that the described approximately linear function of regulating correspondence is: C=1/ (2-M
(B-1))+kA, wherein: M is the abscissa of grey scale transformation point, and C is the multiple of display backlight brightness with respect to original intensity, and A is an intensity information, and B is a mode of operation, k is the light intensity susceptibility of display backlight.
8. according to the described control method of claim 1, it is characterized in that the described function of adjusting correspondence is: Y=-X
(A+1)+ 2X, wherein: X is certain the picture element grey scale normalization value before the conversion, and Y is certain the picture element grey scale normalization value after the conversion, and A is an intensity information.
9. according to the described control method of claim 1, it is characterized in that the described function of adjusting correspondence is: Y=-X
(A+2)+ 2X, wherein: X is certain the picture element grey scale normalization value before the conversion, and Y is certain the picture element grey scale normalization value after the conversion, and A is an intensity information.
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