CN106875899A - The control method and electronic equipment of a kind of display output device - Google Patents
The control method and electronic equipment of a kind of display output device Download PDFInfo
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- CN106875899A CN106875899A CN201710166023.3A CN201710166023A CN106875899A CN 106875899 A CN106875899 A CN 106875899A CN 201710166023 A CN201710166023 A CN 201710166023A CN 106875899 A CN106875899 A CN 106875899A
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Liquid Crystal Display Device Control (AREA)
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Abstract
The embodiment of the invention provides the control method and electronic equipment of display output device, by obtaining the first brightness value and supply current corresponding with the first brightness value, first brightness value is used to control the brightness of display output device to be in the first brightness value, M path included by backlight drive circuit based on the first brightness value and display output device, N number of path is selected from M path, based on supply current by light source power supply that N number of path is each path on N number of path, to cause that the brightness of display output device is the first brightness value, wherein, electric current sum in N number of path is equal to supply current.This programme determines the number of passages that backlight drive circuit need to be opened by according to the first brightness value, to enable that backlight drive circuit adjusts the unlatching path of varying number according to the first different brightness values, so as to improve the efficiency of backlight drive circuit.
Description
Technical field
The present invention relates to control field, more particularly to a kind of display output device control method and electronic equipment.
Background technology
As the screen size of electronic equipment is increasing, light source (such as LED) quantity that display screen includes is more next
More, display screen also includes the backlight drive circuit for driving light source luminescent, and the light of driving is needed due to backlight drive circuit
Source quantity becomes many with the increase of screen size so that the delivery efficiency reduction of backlight drive circuit.
The content of the invention
At present, in use, all light sources that display screen is included need to open simultaneously display screen, in all light sources
In the case that total current is certain, every group of smaller backlight drive of dutycycle of the average current of light source (including one or more light sources)
The delivery efficiency of circuit is lower, because the quantity of light source is on the increase so that the duty of every group of electric current of light source is smaller, so that
Reduce the delivery efficiency of backlight drive circuit.In view of this, the present invention provide a kind of display output device control method and
Electronic equipment, the influence back of the body smaller with the duty for solving every group of average current of light source in backlight drive circuit in the prior art
The problem of the delivery efficiency of light drive circuit, its concrete scheme is as follows：
A kind of control method of display output device, including：
The first brightness value and supply current corresponding with first brightness value are obtained, first brightness value is used to control
The brightness for making the display output device is in first brightness value；
M path included by backlight drive circuit based on first brightness value and the display output device,
N number of path is selected from the M path, there is at least one light source on each path in the M path；M >=N, M, N
It is integer；
Based on the supply current by the light source power supply that N number of path is each path on N number of path, so that
The brightness for obtaining the display output device is first brightness value, wherein, the electric current sum on N number of path is equal to described
Supply current.
Preferably, also include：
Judge first brightness value whether be the display output device maximum brightness value；
When first brightness value is not the maximum brightness value of the display output device, performs step and be based on described the
M path included by the backlight drive circuit of one brightness value and the display output device, selects from the M path
N number of path.
Wherein, included by the backlight drive circuit based on first brightness value and the display output device
M path, selects N number of path from the M path, including：
Determine the maximum current that each path can bear in the M path, each path to be held in the M path
The maximum current received is equal；
According to the corresponding supply current of the first brightness value and the maximum current, select N number of from the M path
Path, the electric current of each path is less than or equal to the maximum current, electric current sum of N number of path etc. in N number of path
In the supply current.
Wherein, included by the backlight drive circuit based on first brightness value and the display output device
M path, selects N number of path from the M path, including：
According to the average current of the corresponding each path of each delivery efficiency, the mesh of the corresponding each path of highest delivery efficiency is determined
Average current；
According to the corresponding supply current of the first brightness value and the purpose average current, selected from the M path
Select N number of path, the electric current of each path is equal to the purpose average current in N number of path, the electric current of N number of path it
With equal to the supply current.
Wherein, the average current according to the corresponding each path of each delivery efficiency, determines that highest delivery efficiency is corresponding
The purpose average current of each path includes：
When the average current of the corresponding each path of the highest delivery efficiency has multiple, the highest delivery efficiency is determined
Corresponding minimum average current；
Using the minimum average current as the purpose average current.
A kind of electronic equipment, including：
Display output device, for being shown with corresponding bright；
Processor, for obtaining the first brightness value and supply current corresponding with first brightness value, described first
Brightness value is used to control the brightness of the display output device to be in first brightness value；
M path included by backlight drive circuit based on first brightness value and the display output device,
N number of path is selected from the M path, there is at least one light source on each path in the M path；M >=N, M, N
It is integer；
Based on the supply current by the light source power supply that N number of path is each path on N number of path, so that
The brightness for obtaining the display output device is first brightness value, wherein, the electric current sum on N number of path is equal to described
Supply current.
Preferably, the processor is additionally operable to：
Judge first brightness value whether be the display output device maximum brightness value；
When first brightness value is not the maximum brightness value of the display output device, performs step and be based on described the
M path included by the backlight drive circuit of one brightness value and the display output device, selects from the M path
N number of path.
Wherein, the processor is in the backlight drive circuit based on first brightness value and the display output device
M included path, when selecting N number of path from the M path, specifically for：
Determine the maximum current that each path can bear in the M path, each path to be held in the M path
The maximum current received is equal；
According to the corresponding supply current of the first brightness value and the maximum current, select N number of from the M path
Path, the electric current of each path is less than or equal to the maximum current, electric current sum of N number of path etc. in N number of path
In the supply current.
Wherein, the processor is in the backlight drive circuit based on first brightness value and the display output device
M included path, when selecting N number of path from the M path, specifically for：
According to the average current of the corresponding each path of each delivery efficiency, the mesh of the corresponding each path of highest delivery efficiency is determined
Average current；
According to the corresponding supply current of the first brightness value and the purpose average current, selected from the M path
Select N number of path, the electric current of each path is equal to the purpose average current in N number of path, the electric current of N number of path it
With equal to the supply current.
Wherein, the processor determines highest output effect in the average current according to the corresponding each path of each delivery efficiency
During the purpose average current of the corresponding each path of rate, specifically for：
When the average current of the corresponding each path of the highest delivery efficiency has multiple, the highest delivery efficiency is determined
Corresponding minimum average current；
Using the minimum average current as the purpose average current.
From above-mentioned technical proposal as can be seen that the control method and electronic equipment of display output device disclosed in the present application,
By obtaining the first brightness value and supply current corresponding with the first brightness value, the first brightness value is used to control display output device
Brightness be in the first brightness value, M included by the backlight drive circuit based on the first brightness value and display output device is logical
Road, selects N number of path from M path, is supplied by the light source that N number of path is each path on N number of path based on supply current
Electricity, to cause that the brightness of display output device is the first brightness value, wherein, the electric current sum in N number of path is equal to supply current.
This programme determines the number of passages that backlight drive circuit need to be opened by according to the first brightness value, to enable backlight drive circuit
Enough unlatching paths that varying number is adjusted according to the first different brightness values, so as to improve the efficiency of backlight drive circuit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of display output device disclosed in the embodiment of the present invention；
Fig. 2 is the position relationship schematic diagram of a kind of display output device disclosed in the embodiment of the present invention and each group light source；
Fig. 3 is a kind of circuit diagram of backlight drive circuit disclosed in the embodiment of the present invention；
Fig. 4 is a kind of schematic flow sheet of the control method of display output device disclosed in the embodiment of the present invention；
Fig. 5 a kind of delivery efficiency of backlight drive circuit and the average electricity provided for light source disclosed in the embodiment of the present invention
The relation schematic diagram of stream；
Fig. 6 is the duty that each path corresponding average current during each path is all turned on disclosed in the embodiment of the present invention
Than the comparison diagram of the dutycycle of each path corresponding average current during with only opening section path；
Fig. 7 is the structural representation of a kind of electronic equipment disclosed in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
At present, the display screen (comprising the display output device in the embodiment of the present invention) of electronic equipment in use,
Display screen is needed to be in illuminating state, all light sources are opened simultaneously in now needing display output device.In the embodiment of the present invention
The on and off of multiple light sources, wherein one or more light sources composition one group of light source, backlight drive electricity are driven by backlight drive circuit
Road includes multiple paths, and each path drives one group of light source.The constant feelings of the total current of all light sources included in electronic equipment
Under condition, the dutycycle of average current is smaller, and the delivery efficiency of backlight drive circuit is relatively low.In order to improve the defeated of backlight drive circuit
Go out efficiency, the embodiment of the invention provides and backlight drive circuit is determined by the first brightness value according to needed for display output device
The number of passages that need to be opened, to enable that backlight drive circuit adjusts the unlatching of varying number according to the first different brightness values
Path (path correspondence one group of light source).For being every time in the prior art to open whole light sources, the present invention is implemented
The implementation that example passes through only opening section light source so that the dutycycle of every group of average current of light source is larger, so as to improve the back of the body
The delivery efficiency of light drive circuit.
As shown in figure 1, being the structural representation of display output device provided in an embodiment of the present invention.
Fig. 1 is said as a example by (Liquid Crystal Display, liquid crystal display) with display output device as LCD
Bright.
Display output device can include：Glass substrate 11, LCM (LCD Module, Liquid Crystal Module) 12, glass substrate
13rd, Polarizer 14, diffuser plate 15, light guide plate 16 and reflecting plate 17.
Each group light source can be in the same side of display output device, naturally it is also possible to positioned at the difference of display output device
Side, shows each group light source at the same side of display output device in Fig. 1, position of the multiple light sources in display output device
Put.As shown in Fig. 2 being a kind of display output device provided in an embodiment of the present invention and the position relationship schematic diagram of each group light source.
Assuming that the number of light source is 4 in one group of light source, and include light source 1, light source 2, light source 3, light source per one group of light source
Each group light source is located at the side of display output device in 4, Fig. 2.4 groups of light sources are shown in Fig. 2, so the display shown in Fig. 2 is defeated
The backlight drive circuit gone out in device has 4 groups of paths.It is understood that the path number that display output device is included can be
2nd, 3,4,5 ... ..., do not limited by Fig. 2.
Because the number of light source in the one group of light source shown in Fig. 2 is 4, then backlight drive circuit includes 4 driving passages,
I.e. 4 paths, each driving passage can drive one group of light source, specific as shown in figure 3, being one kind provided in an embodiment of the present invention
The circuit diagram of backlight drive circuit.
As shown in figure 3, backlight drive circuit includes 4 driving paths of passage, i.e., 4：CH1, CH2, CH3 and CH4, often
One passage correspondence drives the on and off of each light source in one group of light source.
It is described in detail below and how one or more groups of light source ignitings is controlled by backlight drive circuit.
The invention discloses a kind of control method of display output device, its flow chart as shown in figure 4, including：
Step S401：The first brightness value and supply current corresponding with first brightness value are obtained, described first is bright
Angle value is used to control the brightness of the display output device to be in first brightness value.
Step S402：Included by backlight drive circuit based on first brightness value and the display output device
M path, selects N number of path from the M path, has at least one light source on each path in the M path.
M >=N, M, N are integer.
Still by taking Fig. 2 as an example, it is assumed that display output device includes 4 groups of light sources, then backlight drive circuit includes 4 paths, this
When M=4, N can be 1, or, 2, or, 3, or 4.In Fig. 2, there are 4 light sources on each path.Light source can be LED etc..
Step S403：Based on the supply current by light source that N number of path is each path on N number of path
Power supply, to cause that the brightness of the display output device is first brightness value.
Wherein, the electric current sum on N number of path is equal to the supply current.
The control method of display output device disclosed in the embodiment of the present invention, by obtaining the first brightness value and bright with first
The corresponding supply current of angle value, the first brightness value is used to control the brightness of display output device to be in the first brightness value, based on the
M path included by the backlight drive circuit of one brightness value and display output device, selects N number of path, base from M path
In supply current by the light source power supply that N number of path is each path on N number of path, to cause the brightness of display output device
It is the first brightness value, wherein, the electric current sum on N number of path is equal to supply current.This programme is by true according to the first brightness value
The number of passages that backlight drive circuit need to be opened is determined, to enable that backlight drive circuit is adjusted according to the first different brightness values
The unlatching path of varying number, so as to improve the efficiency of backlight drive circuit.
The implementation of N number of path is selected from M path various, and the embodiment of the present invention is provided but is not limited to following several
Kind.
The first, selects the implementation of N number of path from M path.
It is appreciated that display output device has a maximum brightness value, and the corresponding supply current of maximum brightness value is most
Greatly, generally, the corresponding supply current of maximum brightness value is that light source in all M paths on each path can bear
Maximum current sum.Therefore, when the first brightness value is maximum brightness value, M=N；When the first brightness value is not high-high brightness
During value, N<M.Specific method includes：
Judge first brightness value whether be the display output device maximum brightness value；
When first brightness value is not the maximum brightness value of the display output device, based on first brightness value
And M path included by the backlight drive circuit of the display output device, select N number of path from the M path；
When first brightness value is the maximum brightness value of the display output device, by the backlight drive circuit
M included path is the light source power supply of each path on the M path, to cause the brightness of the display output device
It is first brightness value.
Second, the implementation of N number of path is selected from M path.
It is understood that the maximum current that be can bear per one group of light source is certain, when the electricity provided for every group of light source
When stream is more than the maximum current that it can bear, the light source of the group will be damaged, or the lost of life, therefore, improving backlight
It is maximum electricity that the electric current of every one group of light source distribution can not can bear more than it during the delivery efficiency of drive circuit
Stream.
M included by the backlight drive circuit based on first brightness value and the display output device is logical
Road, selects N number of path from the M path, including：
Determine the maximum current that each path can bear in the M path, each path to be held in the M path
The maximum current received is equal；
According to the corresponding supply current of the first brightness value and the maximum current, select N number of from the M path
Path, the electric current of each path is less than or equal to the maximum current, electric current sum of N number of path etc. in N number of path
In the supply current.
The third, selects the implementation of N number of path from M path.
As shown in figure 5, for a kind of delivery efficiency of backlight drive circuit provided in an embodiment of the present invention with provide for light source
Average current relation schematic diagram.
Abscissa is the average current of the corresponding each path of each path that backlight drive circuit control is opened in Fig. 5.Still
By taking Fig. 2 as an example, it is assumed that backlight drive circuit opens 2 groups of light sources, now the corresponding supply current of the first brightness value is 40mA, often
One group of light source is that the average current of each path is 40/2=20mA.
Ordinate is the delivery efficiency of backlight drive circuit.
As seen in Figure 5, when average current is smaller, the average current for rising to every group of light source offer can be significantly
Degree improves the delivery efficiency of backlight drive circuit.When average current reaches certain value, then rise to that every group of light source provide it is flat
Equal electric current, it is smaller that the delivery efficiency of backlight drive circuit is improved, and will not even improve.
As in Fig. 5, average current is improved during to 5mA from 1mA, the delivery efficiency of backlight drive circuit from 80% improve to
88%.When average current reaches 10mA, the delivery efficiency of backlight drive circuit is 90%.When average current is 20mA, the back of the body
The delivery efficiency of light drive circuit is still 90%.
The average current of the corresponding each path of each delivery efficiency can be prestored, such as the backlight drive electricity shown in Fig. 5
The delivery efficiency on road and the corresponding relation of average current.
M included by the backlight drive circuit based on first brightness value and the display output device is logical
Road, selects N number of path from the M path, including：
According to the average current of the corresponding each path of each delivery efficiency, the mesh of the corresponding each path of highest delivery efficiency is determined
Average current；
According to the corresponding supply current of the first brightness value and the purpose average current, selected from the M path
Select N number of path, the electric current of each path is equal to the purpose average current in N number of path, the electric current of N number of path it
With equal to the supply current.
Still by taking Fig. 5 as an example, the purpose average current of the corresponding each path of highest delivery efficiency 90% of backlight drive circuit
Arbitrary value for 10mA and more than 10mA.
The computing formula of N can be as follows：Assuming that supply current is 20mA, purpose average current
Be 10mA, then N=2.
Preferably, when the average current of the corresponding each path of the highest delivery efficiency has multiple, the highest is determined
The corresponding minimum average current of delivery efficiency；Using the minimum average current as the purpose average current.
Average current such as the corresponding each path of highest delivery efficiency in Fig. 5 is 10mA and the arbitrary value more than 10mA,
And the average current of minimum is 10mA, therefore it is purpose average current that 10mA is.
In order to allow those skilled in the art more to understand the embodiment of the present invention, below with the backlight drive circuit shown in Fig. 2
Only include being tested as a example by 4 groups of light sources, obtain every group of signal graph of the average current of light source.As shown in fig. 6, being the present invention
What embodiment was provided is all turned on the dutycycle of the corresponding average current of each path during each path, during with only opening two paths
The comparison diagram of the dutycycle of the corresponding average current of each path.
It is compared for the ease of those skilled in the art, when will simultaneously open 4 groups of light sources, every group of light source is corresponding average
The signal graph of electric current is displayed in the top of Fig. 6, by by the control method of display output device provided in an embodiment of the present invention, from
When N (N is less than 4) group light source is selected in 4 groups of light sources, the signal graph of the corresponding average current of N group light sources is displayed in the lower section of Fig. 6.
Assuming that opening 4 groups of light sources, then every group of average current of light source is 4mA.Assuming that first group of CH1 correspondences shown in Fig. 3
Light source ILED1, CH2 correspondence the is a group light source ILED2, CH3 correspondence the 3rd group of light source ILED3, CH4 the 4th group of light source of correspondence
ILED4。
Assuming that the N groups light source chosen is 2 groups of light sources, and 2 paths of unlatching are respectively CH1 and CH3, and CH2 and CH4 pairs
The path answered is closed.So every group light source, the i.e. corresponding average current of each path are 8mA.
The method of opening section path provided in an embodiment of the present invention as can be seen from Figure 6 so that each path is corresponding
The dutycycle of average current becomes big, so as to improve the delivery efficiency of backlight drive circuit.
The embodiment of the present invention additionally provides a kind of electronic equipment, as shown in fig. 7, being a kind of electricity provided in an embodiment of the present invention
The structural representation of sub- equipment, the electronic equipment includes：
Display output device 71, for being shown with corresponding bright；
Processor 72, for obtaining the first brightness value and supply current corresponding with first brightness value, described the
One brightness value is used to control the brightness of the display output device to be in first brightness value；
M path included by backlight drive circuit based on first brightness value and the display output device,
N number of path is selected from the M path, there is at least one light source on each path in the M path；M >=N, M, N
It is integer；
Based on the supply current by the light source power supply that N number of path is each path on N number of path, so that
The brightness for obtaining the display output device is first brightness value, wherein, the electric current sum on N number of path is equal to described
Supply current.
Optionally, the processor is additionally operable to：
Judge first brightness value whether be the display output device maximum brightness value；
When first brightness value is not the maximum brightness value of the display output device, performs step and be based on described the
M path included by the backlight drive circuit of one brightness value and the display output device, selects from the M path
N number of path.
Optionally, the processor is in the backlight drive electricity based on first brightness value and the display output device
M path included by road, when selecting N number of path from the M path, specifically for：
Determine the maximum current that each path can bear in the M path, each path to be held in the M path
The maximum current received is equal；
According to the corresponding supply current of the first brightness value and the maximum current, select N number of from the M path
Path, the electric current of each path is less than or equal to the maximum current, electric current sum of N number of path etc. in N number of path
In the supply current.
Optionally, the processor is in the backlight drive electricity based on first brightness value and the display output device
M path included by road, when selecting N number of path from the M path, specifically for：
According to the average current of the corresponding each path of each delivery efficiency, the mesh of the corresponding each path of highest delivery efficiency is determined
Average current；
According to the corresponding supply current of the first brightness value and the purpose average current, selected from the M path
Select N number of path, the electric current of each path is equal to the purpose average current in N number of path, the electric current of N number of path it
With equal to the supply current.
Optionally, the processor determines that highest is exported in the average current according to the corresponding each path of each delivery efficiency
During the purpose average current of the corresponding each path of efficiency, specifically for：
When the average current of the corresponding each path of the highest delivery efficiency has multiple, the highest delivery efficiency is determined
Corresponding minimum average current；
Using the minimum average current as the purpose average current.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes the composition and step of each example according to function in the above description.These
Function is performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
The step of method or algorithm for being described with reference to the embodiments described herein, directly can be held with hardware, processor
Capable software module, or the two combination is implemented.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In field in known any other form of storage medium.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (10)
1. a kind of control method of display output device, it is characterised in that including：
The first brightness value and supply current corresponding with first brightness value are obtained, first brightness value is used to control institute
The brightness for stating display output device is in first brightness value；
M path included by backlight drive circuit based on first brightness value and the display output device, from institute
State and select N number of path in M path, there is at least one light source on each path in the M path；M >=N, M, N are whole
Number；
Based on the supply current by the light source power supply that N number of path is each path on N number of path, to cause institute
The brightness of display output device is stated for first brightness value, wherein, the electric current sum on N number of path is equal to the power supply
Electric current.
2. method according to claim 1, it is characterised in that also include：
Judge first brightness value whether be the display output device maximum brightness value；
When first brightness value is not the maximum brightness value of the display output device, step is performed bright based on described first
M path included by the backlight drive circuit of angle value and the display output device, selects N number of from the M path
Path.
3. method according to claim 1, it is characterised in that described defeated based on first brightness value and the display
Go out M path included by the backlight drive circuit of device, N number of path is selected from the M path, including：
Determine the maximum current that each path can bear in the M path, each path can bear in the M path
Maximum current is equal；
According to the corresponding supply current of the first brightness value and the maximum current, select N number of logical from the M path
Road, the electric current of each path is less than or equal to the maximum current in N number of path, and the electric current sum of N number of path is equal to
The supply current.
4. method according to claim 1, it is characterised in that described defeated based on first brightness value and the display
Go out M path included by the backlight drive circuit of device, N number of path is selected from the M path, including：
According to the average current of the corresponding each path of each delivery efficiency, determine that the purpose of the corresponding each path of highest delivery efficiency is put down
Equal electric current；
According to the corresponding supply current of the first brightness value and the purpose average current, select N number of from the M path
Path, the electric current of each path is equal to the purpose average current, electric current sum of N number of path etc. in N number of path
In the supply current.
5. method according to claim 4, it is characterised in that described according to the average of the corresponding each path of each delivery efficiency
Electric current, determining the purpose average current of the corresponding each path of highest delivery efficiency includes：
When the average current of the corresponding each path of the highest delivery efficiency has multiple, determine that the highest delivery efficiency is corresponding
Minimum average current；
Using the minimum average current as the purpose average current.
6. a kind of electronic equipment, it is characterised in that including：
Display output device, for being shown with corresponding bright；
Processor, for obtaining the first brightness value and supply current corresponding with first brightness value, first brightness
It is worth for controlling the brightness of the display output device to be in first brightness value；
M path included by backlight drive circuit based on first brightness value and the display output device, from institute
State and select N number of path in M path, there is at least one light source on each path in the M path；M >=N, M, N are whole
Number；
Based on the supply current by the light source power supply that N number of path is each path on N number of path, to cause institute
The brightness of display output device is stated for first brightness value, wherein, the electric current sum on N number of path is equal to the power supply
Electric current.
7. electronic equipment according to claim 6, it is characterised in that the processor is additionally operable to：
Judge first brightness value whether be the display output device maximum brightness value；
When first brightness value is not the maximum brightness value of the display output device, step is performed bright based on described first
M path included by the backlight drive circuit of angle value and the display output device, selects N number of from the M path
Path.
8. electronic equipment according to claim 6, it is characterised in that the processor based on first brightness value and
M path included by the backlight drive circuit of the display output device, when selecting N number of path from the M path, tool
Body is used for：
Determine the maximum current that each path can bear in the M path, each path can bear in the M path
Maximum current is equal；
According to the corresponding supply current of the first brightness value and the maximum current, select N number of logical from the M path
Road, the electric current of each path is less than or equal to the maximum current in N number of path, and the electric current sum of N number of path is equal to
The supply current.
9. electronic equipment according to claim 6, it is characterised in that the processor based on first brightness value and
M path included by the backlight drive circuit of the display output device, when selecting N number of path from the M path, tool
Body is used for：
According to the average current of the corresponding each path of each delivery efficiency, determine that the purpose of the corresponding each path of highest delivery efficiency is put down
Equal electric current；
According to the corresponding supply current of the first brightness value and the purpose average current, select N number of from the M path
Path, the electric current of each path is equal to the purpose average current, electric current sum of N number of path etc. in N number of path
In the supply current.
10. electronic equipment according to claim 9, it is characterised in that the processor is corresponding according to each delivery efficiency
The average current of each path, when determining the purpose average current of the corresponding each path of highest delivery efficiency, specifically for：
When the average current of the corresponding each path of the highest delivery efficiency has multiple, determine that the highest delivery efficiency is corresponding
Minimum average current；
Using the minimum average current as the purpose average current.
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