CN104851415A - Control method and device, and electronic equipment - Google Patents
Control method and device, and electronic equipment Download PDFInfo
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- CN104851415A CN104851415A CN201510315589.9A CN201510315589A CN104851415A CN 104851415 A CN104851415 A CN 104851415A CN 201510315589 A CN201510315589 A CN 201510315589A CN 104851415 A CN104851415 A CN 104851415A
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Abstract
The invention discloses a control method and device, and electronic equipment. When a target drive current value corresponding to the brightness requested by a user is less than a preset current threshold value (a preset minimum output current of a light source drive circuit), the output current of the light source drive circuit does not need to be controlled to be the target drive current value, so as to prevent the too large fluctuation proportion of the output current from causing the unstable screen brightness, but is controlled to be greater than or equal to the preset current threshold value, thereby guaranteeing a small fluctuation proportion. Moreover, a needed drive current is supplied to a display screen through the dividing of the output current of the drive circuit. The dividing of the current cannot affect the fluctuation proportion, thereby achieving a larger adjustment range of brightness under the condition of guaranteeing the stability of the screen brightness, meeting the demands of a user for low brightness, and achieving better user experience.
Description
Technical field
The invention belongs to the screen intensity regulation and control field of electronic equipment, particularly relate to a kind of control method, device and electronic equipment.
Background technology
At present, the electronic equipment such as smart mobile phone, panel computer, by adopting PWM (Pulse WidthModulate, pulse-length modulation) control LED (Light Emitting Diode, light emitting diode) output current of driving circuit, i.e. drive current, carrys out adjusting screen brightness, drive current is larger, and screen intensity is higher.
LED drive circuit comprises Switching Power Supply and inductance, Switching Power Supply and inductance cause the output current of LED drive circuit to there is the fluctuation of certain amplitude because of its inherent characteristic, and then when formulating the brightness scheme of electronic equipment, require that the output current of LED drive circuit can not be too little (when being less than certain threshold value, the fluctuation ratio that fluctuating range accounts for output current is too large, and screen intensity is unstable).Based on this, the screen intensity modification scope of current electronic device is general less, even if be adjusted to minimum brightness, in the scenes such as dark, backlight, still there is the higher problem of brightness, can not meet the low-light level demand of user, reduce Consumer's Experience.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of control method, device and electronic equipment, be intended to solve the inherent characteristic of prior art because of LED drive circuit breaker in middle power supply and inductance, and cause the screen intensity modification scope of electronic equipment this problem less.
For this reason, the present invention's openly following technical scheme:
A kind of control method, be applied to electronic equipment, described electronic equipment has display screen, display screen light source and light source driving circuit, and described method comprises:
Receive user to the brightness regulation request of display screen, described brightness regulation request comprises target brightness value;
Obtain the target drive current value corresponding to described target brightness value;
Judge that whether described target drive current value is lower than the current threshold preset; Described current threshold is the minimum output current of prespecified light source driving circuit;
If judged result is yes, the output current then controlling light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
Said method, preferably, the output current of described control light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be that the drive current of described target drive current value comprises to be embodied as display screen light source:
Utilize pulse width modulation (PWM), the output current of light source driving circuit is controlled to be a pre-set current value being not less than described current threshold;
The output current of divided circuit to light source driving circuit controlling to preset is shunted, and provides numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
Said method, preferably, described default divided circuit comprises the switched resistor circuit of N number of parallel connection, and each described switched resistor circuit comprises a metal-oxide-semiconductor and is connected to the resistance of described metal-oxide-semiconductor source electrode, in each switched resistor circuit, the original state of metal-oxide-semiconductor is off state, and N is natural number.
Said method, preferably, the output current of divided circuit to light source driving circuit that described control is preset is shunted, and provides numerical value to be the drive current of described target drive current value, comprising to be embodied as display screen light source:
Based on the output current of light source driving circuit, the resistance of display screen light source and described target drive current value, calculate the shunt resistance values realized needed for shunting;
Closed control is carried out to the metal-oxide-semiconductor in target switch resistance circuit, to realize shunting; Described target switch resistance circuit is: resistance size is the switched resistor circuit at the resistance place of described shunt resistance values.
Said method, preferably, also comprises:
If judged result is no, then the output current controlling described light source driving circuit is described target drive current value.
A kind of control device, is applied to electronic equipment, and described electronic equipment has display screen, display optical screen source and light source driving circuit, and described device comprises:
Receiver module, for receiving the brightness regulation request of user to display screen, described brightness regulation request comprises target brightness value;
Acquisition module, for obtaining the target drive current value corresponding to described target brightness value;
Judge module, for judging that whether described target drive current value is lower than the current threshold preset; Described current threshold is the minimum output current of prespecified light source driving circuit;
First control module, for when judged result is for being, the output current controlling light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
Said apparatus, preferably, described first control module comprises:
Output control unit, for utilizing pulse width modulation (PWM), controls to be a pre-set current value being not less than described current threshold by the output current of light source driving circuit;
Flow-dividing control unit, shunts for the output current of divided circuit to light source driving circuit controlling to preset, and provides numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
Said apparatus, preferably, described default divided circuit comprises the switched resistor circuit of N number of parallel connection, and each described switched resistor circuit comprises a metal-oxide-semiconductor and is connected to the resistance of described metal-oxide-semiconductor source electrode, in each switched resistor circuit, the original state of metal-oxide-semiconductor is off state, and N is natural number; Then described flow-dividing control unit comprises:
Computation subunit, for based on the output current of described light source driving circuit, the resistance of display screen light source and described target drive current value, calculates the shunt resistance values realized needed for shunting;
Closed control subelement, for carrying out Closed control to the metal-oxide-semiconductor in target switch resistance circuit, to realize shunting; Described target switch resistance circuit is: resistance size is the switched resistor circuit at the resistance place of described shunt resistance values.
Said apparatus, preferably, also comprises:
Second control module, for when the judged result of described judging unit is no, the output current controlling described light source driving circuit is described target drive current value.
A kind of electronic equipment, have display screen, display optical screen source and light source driving circuit, described electronic equipment comprises control device as above.
From above scheme, the target drive current value that the brightness that the application asks user is corresponding, during lower than current threshold (this current threshold is the minimum output current of prespecified light source driving circuit) of presetting, for avoiding the fluctuation ratio of output current too large, cause screen intensity unstable, no longer the output current of light source driving circuit is controlled for described target drive current value, but control it as the pre-set current value that is not less than described current threshold, guarantee a less fluctuation ratio, and simultaneously by shunting the output current of driving circuit, be embodied as the drive current that display screen light source provides required.Shunting can not have an impact to the fluctuation ratio of electric current, thus the application, under the prerequisite ensureing screen intensity stability, achieves larger brightness control scope, meets the low-light level demand of user, better user experience.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the process flow diagram of a kind of control method embodiment one that the application provides;
Fig. 2 is the process flow diagram of a kind of control method embodiment two that the application provides;
Fig. 3 is the structural representation of a kind of control device embodiment three that the application provides;
Fig. 4 is the structural representation of a kind of control device embodiment four that the application provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
With reference to figure 1, the process flow diagram of a kind of control method embodiment one that Fig. 1 provides for the application, described method can be applicable to the electronic equipment such as smart mobile phone, panel computer, described electronic equipment has display screen, display screen light source and light source driving circuit, described display screen light source can be LED backlight, CCFL (ColdCathode Fluorescent Lamp, cold-cathode fluorescence lamp) the various backlight such as backlight, as shown in Figure 1, described method can comprise the following steps:
S101: receive user to the brightness regulation request of display screen, described brightness regulation request comprises target brightness value.
The brightness adjustment approach that user can provide based on electronic equipment, performs corresponding operating and realizes to the brightness value needed for electronic equipment requests at brightness regulation interface.
Such as, for the operation luminance bar regulative mode that the electronic equipments such as current smart mobile phone more often adopt, user is by being dragged to the relevant position of luminance bar by the slide sign in luminance bar, or the relevant position directly clicking luminance bar makes slide sign beat to this position, realizes to the brightness value associated by electronic equipment requests slide sign present convergence location.
S102: obtain the target drive current value corresponding to described target brightness value.
At present, electronic equipment adopts the output current of light source driving circuit, as the drive current of display screen light source, and controls the output current of light source driving circuit and the size of drive current by PWM, control the brightness of display screen light source, and then realize brightness of display screen regulation and control; Drive current is larger, and brightness of display screen is higher, otherwise drive current is less, and brightness of display screen is then lower.The all corresponding corresponding driving current value of each brightness number of display screen.
Based on this, the present embodiment pre-establishes the mapping algorithm between brightness of display screen and required drive current.Thus have brightness of display screen to regulate and control demand user, and after asking a corresponding target brightness value, according to this mapping algorithm, can know and realize this target drive current value needed for target brightness value correspondence.
S103: judge that whether described target drive current value is lower than the current threshold preset; Described current threshold is the minimum output current of prespecified light source driving circuit.
S104: if judged result is yes, the output current then controlling light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
Switching Power Supply and inductance is comprised in the light source driving circuit of the light sources such as LED, Switching Power Supply and inductance cause the output current of driving circuit to there is the fluctuation of certain amplitude because of its inherent characteristic, fixing driving circuit, the fluctuating range of its output current is also fixing.Thus output current is larger, its fluctuation ratio is less, and namely the output current of light source driving circuit and its fluctuation ratio are inversely proportional to, particularly:
Fluctuation ratio=fluctuating range/the output current of output current.
The stability of display screen screen intensity depends on the stability of drive current largely, and drive current is more stable, then the stability of screen intensity is higher.Therefore consider that the screen intensity stability of user is experienced, when formulating the brightness scheme of electronic equipment, for avoiding occurring screen intensity wild effect, require that the fluctuation ratio of drive current can not exceed certain numerical value, and then under the fixing prerequisite of the fluctuating range of driving circuit output current, require that the output current of driving circuit can not be less than certain current threshold.The concrete numerical value of this current threshold depends on therefore in practical application, can be designed the practical devices design of electronic equipment, set the concrete numerical value of this current threshold according to the practical devices of electronic equipment by technician.
When the target drive current value needed for the brightness correspondence that user asks is less than described current threshold, for avoiding occurring screen intensity wild effect, the application utilizes PWM to be controlled to be a pre-set current value being not less than described current threshold by the output current of light source driving circuit, can be specifically such as described current threshold by the Numerical Control of output current, and utilize the output current of default divided circuit to light source driving circuit to shunt simultaneously, pass through shunting mode, being embodied as display screen light source provides a numerical value to be the drive current of described target drive current value, meet the low-light level demand of user.
The divided circuit of the present embodiment specifically comprises the switched resistor circuit of N number of parallel connection, each described switched resistor circuit comprises a metal-oxide-semiconductor and is connected to the resistance of described metal-oxide-semiconductor source electrode, in each switched resistor circuit, the original state of metal-oxide-semiconductor is off state, and N is natural number.The resistance of N number of resistance included in N number of switched resistor circuit is different, thus the output current that each switched resistor circuit can be light source driving circuit provides diverter function in various degree.
Before utilizing described divided circuit to shunt, need first to realize the shunt resistance values R needed for shunting according to following formulae discovery
distri:
R
distri＝I
drive·R
light/(I
out-I
drive)
In this formula, I
outrepresent output current, the I of light source driving circuit
driverepresent described target drive current value, R
lightrepresent the resistance of display screen light source.
On this basis, can determine that in divided circuit, resistance size is R
distrithe switched resistor circuit at resistance place, afterwards, the mos pipe utilizing controller to control in this switched resistor circuit is closed, realizes shunting the output current of light source driving circuit, finally produces the drive current that size is described target drive current value.
Wherein, shunting can not have an impact to the fluctuation ratio of electric current.
Such as, suppose that light source driving circuit exists the current fluctuation that amplitude size is 1A, and the fluctuation ratio of hypothesis driven electric current higher than 10% time, user can experience screen intensity instability, and setting described current threshold based on this is 10A.When the drive current needed for the brightness value correspondence that user asks is 8A, then according to the application's method, the output current that PWM can be made to control light source driving circuit is 10A, owing to there is fluctuation, its actual output current is 9A-11A, fluctuation ratio is 1A/10A=10%, after the corresponding switched resistor circuit of employing is shunted it, the drive current that size is 7.2A-8.8A can be obtained, fluctuation ratio is (8.8A-8A)/8A=10%, thus fluctuation constant rate, screen intensity wild effect can not be produced.
The divided circuit that the application provides needs to work when shunt and regulation at pole dark situation, by current sinking, increase extra power consumption, guarantee a less drive current, ensure a comparatively suitable drive current fluctuations ratio simultaneously, while meeting user's low-light level demand, ensure that the stability of screen intensity.
It should be noted that, the diverter function that described divided circuit provides, be specially the shunting in various degree based on resistance different in each switched resistor circuit, thus the screen intensity regulation and control realized on shunting basis are discontinuous, based on this, when practical application the application, can on an electronic device for user designs, a kind of special classification brightness control mode (the operation luminance bar control methods independent of under the dark scene of non-pole) needing shunt and regulation for pole dark scene is provided, as supposed, divided circuit comprises the resistance of 3 different resistances altogether, then can be user pole dark scene is provided under 3 kinds of different gray scales, select for user.
Certainly, also the common regulation and control under the shunt and regulation under the dark scene of pole and non-pole dark scene can be selected to be integrated in one, the mode of operation luminance bar is all adopted to realize regulation and control, but under being different from non-pole dark scene, the continuous brightness value adjusting function based on slide sign position that luminance bar provides, for the situation extremely secretly need carrying out shunt and regulation, the discontinuous brightness value adjusting function for position-based interval that luminance bar provides, such as suppose that divided circuit comprises the resistance of 3 different resistances altogether equally, shadow control region, pole then in luminance bar comprises between three lane place altogether, a corresponding specific brightness value between each lane place, slide sign is positioned to the optional position in certain interval by user, can realize screen intensity being regulated to brightness value corresponding to this interval.
From above scheme, the target drive current value that the brightness that the application asks user is corresponding, during lower than current threshold (this current threshold is the minimum output current of prespecified light source driving circuit) of presetting, for avoiding the fluctuation ratio of output current too large, cause screen intensity unstable, no longer the output current of light source driving circuit is controlled for described target drive current value, but control it as the pre-set current value that is not less than described current threshold, guarantee a less fluctuation ratio, and simultaneously by shunting the output current of driving circuit, be embodied as the drive current that display screen light source provides required.Shunting can not have an impact to the fluctuation ratio of electric current, thus the application, under the prerequisite ensureing screen intensity stability, achieves larger brightness control scope, meets the low-light level demand of user, better user experience.
Embodiment two
With reference to the process flow diagram of a kind of control method embodiment two that figure 2, Fig. 2 provides for the application, as shown in Figure 2, in the present embodiment, described method can also comprise the following steps:
S105: if judged result is no, then the output current controlling described light source driving circuit is described target drive current value.
When the target drive current value needed for the brightness correspondence of user's request is not less than described current threshold, screen intensity wild effect can not be produced, shunt without the need to adopting divided circuit, therefore, directly the output current of light source driving circuit can be controlled for described target drive current value, realize brightness control.
Embodiment three
With reference to figure 3, the structural representation of a kind of control device embodiment three that Fig. 3 provides for the application, described device can be applicable to the electronic equipment such as smart mobile phone, panel computer, described electronic equipment has display screen, display screen light source and light source driving circuit, described display screen light source can be the various backlight such as LED backlight, CCFL backlight, as shown in Figure 3, described device can comprise: receiver module 100, acquisition module 200, judge module 300 and the first control module 400.
Receiver module 100, for receiving the brightness regulation request of user to display screen, described brightness regulation request comprises target brightness value.
The brightness adjustment approach that user can provide based on electronic equipment, performs corresponding operating and realizes to the brightness value needed for electronic equipment requests at brightness regulation interface.
Such as, for the operation luminance bar regulative mode that the electronic equipments such as current smart mobile phone more often adopt, user is by being dragged to the relevant position of luminance bar by the slide sign in luminance bar, or the relevant position directly clicking luminance bar makes slide sign beat to this position, realizes to the brightness value associated by electronic equipment requests slide sign present convergence location.
Acquisition module 200, for obtaining the target drive current value corresponding to described target brightness value.
At present, electronic equipment adopts the output current of light source driving circuit, as the drive current of display screen light source, and controls the output current of light source driving circuit and the size of drive current by PWM, control the brightness of display screen light source, and then realize brightness of display screen regulation and control; Drive current is larger, and brightness of display screen is higher, otherwise drive current is less, and brightness of display screen is then lower.The all corresponding corresponding driving current value of each brightness number of display screen.
Based on this, the present embodiment pre-establishes the mapping algorithm between brightness of display screen and required drive current.Thus have brightness of display screen to regulate and control demand user, and after asking a corresponding target brightness value, according to this mapping algorithm, can know and realize this target drive current value needed for target brightness value correspondence.
Judge module 300, for judging that whether described target drive current value is lower than the current threshold preset; Described current threshold is the minimum output current of prespecified light source driving circuit.
First control module 400, for when judged result is for being, the output current controlling light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
Switching Power Supply and inductance is comprised in the light source driving circuit of the light sources such as LED, Switching Power Supply and inductance cause the output current of driving circuit to there is the fluctuation of certain amplitude because of its inherent characteristic, fixing driving circuit, the fluctuating range of its output current is also fixing.Thus output current is larger, its fluctuation ratio is less, and namely the output current of light source driving circuit and its fluctuation ratio are inversely proportional to, particularly:
Fluctuation ratio=fluctuating range/the output current of output current.
The stability of display screen screen intensity depends on the stability of drive current largely, and drive current is more stable, then the stability of screen intensity is higher.Therefore consider that the screen intensity stability of user is experienced, when formulating the brightness scheme of electronic equipment, for avoiding occurring screen intensity wild effect, require that the fluctuation ratio of drive current can not exceed certain numerical value, and then under the fixing prerequisite of the fluctuating range of driving circuit output current, require that the output current of driving circuit can not be less than certain current threshold.The concrete numerical value of this current threshold depends on therefore in practical application, can be designed the practical devices design of electronic equipment, set the concrete numerical value of this current threshold according to the practical devices of electronic equipment by technician.
When the target drive current value needed for the brightness correspondence that user asks is less than described current threshold, for avoiding occurring screen intensity wild effect, the application utilizes PWM to be controlled to be a pre-set current value being not less than described current threshold by the output current of light source driving circuit, can be specifically such as described current threshold by the Numerical Control of output current, and utilize the output current of default divided circuit to light source driving circuit to shunt simultaneously, pass through shunting mode, being embodied as display screen light source provides a numerical value to be the drive current of described target drive current value, meet the low-light level demand of user.
The divided circuit of the present embodiment specifically comprises the switched resistor circuit of N number of parallel connection, each described switched resistor circuit comprises a metal-oxide-semiconductor and is connected to the resistance of described metal-oxide-semiconductor source electrode, in each switched resistor circuit, the original state of metal-oxide-semiconductor is off state, and N is natural number.The resistance of N number of resistance included in N number of switched resistor circuit is different, thus the output current that each switched resistor circuit can be light source driving circuit provides diverter function in various degree.
Before utilizing described divided circuit to shunt, need first to realize the shunt resistance values R needed for shunting according to following formulae discovery
distri:
R
distri＝I
drive·R
light/(I
out-I
drive)
In this formula, I
outrepresent output current, the I of light source driving circuit
driverepresent described target drive current value, R
lightrepresent the resistance of display screen light source.
On this basis, can determine that in divided circuit, resistance size is R
distrithe switched resistor circuit at resistance place, afterwards, the mos pipe utilizing controller to control in this switched resistor circuit is closed, realizes shunting the output current of light source driving circuit, finally produces the drive current that size is described target drive current value.
Wherein, shunting can not have an impact to the fluctuation ratio of electric current.
Such as, suppose that light source driving circuit exists the current fluctuation that amplitude size is 1A, and the fluctuation ratio of hypothesis driven electric current higher than 10% time, user can experience screen intensity instability, and setting described current threshold based on this is 10A.When the drive current needed for the brightness value correspondence that user asks is 8A, then according to the application's method, the output current that PWM can be made to control light source driving circuit is 10A, owing to there is fluctuation, its actual output current is 9A-11A, fluctuation ratio is 1A/10A=10%, after the corresponding switched resistor circuit of employing is shunted it, the drive current that size is 7.2A-8.8A can be obtained, fluctuation ratio is (8.8A-8A)/8A=10%, thus fluctuation constant rate, screen intensity wild effect can not be produced.
The divided circuit that the application provides needs to work when shunt and regulation at pole dark situation, by current sinking, increase extra power consumption, guarantee a less drive current, ensure a comparatively suitable drive current fluctuations ratio simultaneously, while meeting user's low-light level demand, ensure that the stability of screen intensity.
It should be noted that, the diverter function that described divided circuit provides, be specially the shunting in various degree based on resistance different in each switched resistor circuit, thus the screen intensity regulation and control realized on shunting basis are discontinuous, based on this, when practical application the application, can on an electronic device for user designs, a kind of special classification brightness control mode (the operation luminance bar control methods independent of under the dark scene of non-pole) needing shunt and regulation for pole dark scene is provided, as supposed, divided circuit comprises the resistance of 3 different resistances altogether, then can be user pole dark scene is provided under 3 kinds of different gray scales, select for user.
Certainly, also the common regulation and control under the shunt and regulation under the dark scene of pole and non-pole dark scene can be selected to be integrated in one, the mode of operation luminance bar is all adopted to realize regulation and control, but under being different from non-pole dark scene, the continuous brightness value adjusting function based on slide sign position that luminance bar provides, for the situation extremely secretly need carrying out shunt and regulation, the discontinuous brightness value adjusting function for position-based interval that luminance bar provides, such as suppose that divided circuit comprises the resistance of 3 different resistances altogether equally, shadow control region, pole then in luminance bar comprises between three lane place altogether, a corresponding specific brightness value between each lane place, slide sign is positioned to the optional position in certain interval by user, can realize screen intensity being regulated to brightness value corresponding to this interval.
From above scheme, the target drive current value that the brightness that the application asks user is corresponding, during lower than current threshold (this current threshold is the minimum output current of prespecified light source driving circuit) of presetting, for avoiding the fluctuation ratio of output current too large, cause screen intensity unstable, no longer the output current of light source driving circuit is controlled for described target drive current value, but control it as the pre-set current value that is not less than described current threshold, guarantee a less fluctuation ratio, and simultaneously by shunting the output current of driving circuit, be embodied as the drive current that display screen light source provides required.Shunting can not have an impact to the fluctuation ratio of electric current, thus the application, under the prerequisite ensureing screen intensity stability, achieves larger brightness control scope, meets the low-light level demand of user, better user experience.
Embodiment four
With reference to figure 4, the structural representation of a kind of control device embodiment four that Fig. 4 provides for the application, as shown in Figure 4, in the present embodiment, described device can also comprise the second control module 500, this module is used for when the judged result of described judge module 300 is no, and the output current controlling described driving circuit is described target drive current value.
Particularly, when the target drive current value needed for the brightness correspondence of user's request is not less than described current threshold, screen intensity wild effect can not be produced, shunt without the need to adopting divided circuit, therefore, directly the output current of light source driving circuit can be controlled for described target drive current value, realize brightness control.
Embodiment five
The present embodiment five discloses a kind of electronic equipment, and this electronic equipment has display screen, display optical screen source and light source driving circuit, and this electronic equipment comprises the control device disclosed in embodiment three or any embodiment of embodiment four.
Based on described control device, electronic equipment, under the dark scene of pole, by shunting by the output current of divided circuit to light source driving circuit, meeting the extremely dark brightness demand of user, ensureing the stability of screen intensity simultaneously.
From above scheme, the target drive current value that the brightness that the application asks user is corresponding, during lower than current threshold (this current threshold is the minimum output current of prespecified light source driving circuit) of presetting, for avoiding the fluctuation ratio of output current too large, cause screen intensity unstable, no longer the output current of light source driving circuit is controlled for described target drive current value, but control it as the pre-set current value that is not less than described current threshold, guarantee a less fluctuation ratio, and simultaneously by shunting the output current of driving circuit, be embodied as the drive current that display screen light source provides required.Shunting can not have an impact to the fluctuation ratio of electric current, thus the application, under the prerequisite ensureing screen intensity stability, achieves larger brightness control scope, meets the low-light level demand of user, better user experience.
It should be noted that, each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
For convenience of description, various module or unit is divided into describe respectively with function when describing above system or device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing the application.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add required general hardware platform by software and realizes.Based on such understanding, the technical scheme of the application can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the application or embodiment.
Finally, also it should be noted that, in this article, the relational terms of such as first, second, third and fourth etc. and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a control method, is characterized in that, is applied to electronic equipment, and described electronic equipment has display screen, display screen light source and light source driving circuit, and described method comprises:
Receive user to the brightness regulation request of display screen, described brightness regulation request comprises target brightness value;
Obtain the target drive current value corresponding to described target brightness value;
Judge that whether described target drive current value is lower than the current threshold preset; Described current threshold is the minimum output current of prespecified light source driving circuit;
If judged result is yes, the output current then controlling light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
2. method according to claim 1, it is characterized in that, the output current of described control light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be that the drive current of described target drive current value comprises to be embodied as display screen light source:
Utilize pulse width modulation (PWM), the output current of light source driving circuit is controlled to be a pre-set current value being not less than described current threshold;
The output current of divided circuit to light source driving circuit controlling to preset is shunted, and provides numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
3. method according to claim 2, it is characterized in that, described default divided circuit comprises the switched resistor circuit of N number of parallel connection, each described switched resistor circuit comprises a metal-oxide-semiconductor and is connected to the resistance of described metal-oxide-semiconductor source electrode, in each switched resistor circuit, the original state of metal-oxide-semiconductor is off state, and N is natural number.
4. method according to claim 3, is characterized in that, the output current of divided circuit to light source driving circuit that described control is preset is shunted, and provides numerical value to be the drive current of described target drive current value, comprising to be embodied as display screen light source:
Based on the output current of light source driving circuit, the resistance of display screen light source and described target drive current value, calculate the shunt resistance values realized needed for shunting;
Closed control is carried out to the metal-oxide-semiconductor in target switch resistance circuit, to realize shunting; Described target switch resistance circuit is: resistance size is the switched resistor circuit at the resistance place of described shunt resistance values.
5. the method according to claim 1-4 any one, is characterized in that, also comprises:
If judged result is no, then the output current controlling described light source driving circuit is described target drive current value.
6. a control device, is characterized in that, is applied to electronic equipment, and described electronic equipment has display screen, display optical screen source and light source driving circuit, and described device comprises:
Receiver module, for receiving the brightness regulation request of user to display screen, described brightness regulation request comprises target brightness value;
Acquisition module, for obtaining the target drive current value corresponding to described target brightness value;
Judge module, for judging that whether described target drive current value is lower than the current threshold preset; Described current threshold is the minimum output current of prespecified light source driving circuit;
First control module, for when judged result is for being, the output current controlling light source driving circuit is a pre-set current value being not less than described current threshold, and flow-dividing control is carried out to the output current of light source driving circuit, provide numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
7. device according to claim 6, is characterized in that, described first control module comprises:
Output control unit, for utilizing pulse width modulation (PWM), controls to be a pre-set current value being not less than described current threshold by the output current of light source driving circuit;
Flow-dividing control unit, shunts for the output current of divided circuit to light source driving circuit controlling to preset, and provides numerical value to be the drive current of described target drive current value to be embodied as display screen light source.
8. device according to claim 6, it is characterized in that, described default divided circuit comprises the switched resistor circuit of N number of parallel connection, each described switched resistor circuit comprises a metal-oxide-semiconductor and is connected to the resistance of described metal-oxide-semiconductor source electrode, in each switched resistor circuit, the original state of metal-oxide-semiconductor is off state, and N is natural number; Then described flow-dividing control unit comprises:
Computation subunit, for based on the output current of described light source driving circuit, the resistance of display screen light source and described target drive current value, calculates the shunt resistance values realized needed for shunting;
Closed control subelement, for carrying out Closed control to the metal-oxide-semiconductor in target switch resistance circuit, to realize shunting; Described target switch resistance circuit is: resistance size is the switched resistor circuit at the resistance place of described shunt resistance values.
9. device according to claim 6, is characterized in that, also comprises:
Second control module, for when the judged result of described judging unit is no, the output current controlling described light source driving circuit is described target drive current value.
10. an electronic equipment, is characterized in that, have display screen, display optical screen source and light source driving circuit, described electronic equipment comprises the control device as described in claim 6-9 any one.
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