CN105913810A - Control method, control circuit, backlight integration circuit and terminal equipment - Google Patents
Control method, control circuit, backlight integration circuit and terminal equipment Download PDFInfo
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- CN105913810A CN105913810A CN201610405456.5A CN201610405456A CN105913810A CN 105913810 A CN105913810 A CN 105913810A CN 201610405456 A CN201610405456 A CN 201610405456A CN 105913810 A CN105913810 A CN 105913810A
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- circuit
- current
- resistance
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- backlight
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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
Abstract
The invention provides a control method, a control circuit, a backlight integration circuit and terminal equipment. The control method comprises the following steps of acquiring current brightness of a backlight light source; if the current brightness is greater than preset brightness, making a largest limitation current of a backlight driving circuit increase to a first limitation current and adjusting a duty ratio of a pulse width modulation circuit so that the current brightness matches with the first limitation current; if the current brightness is less than or equal to the preset brightness, making the largest limitation current of the backlight driving circuit reduce to a second limitation current and adjusting the duty ratio of the pulse width modulation circuit so that the current brightness matches with the second limitation current. In embodiments of the invention, through comparing the current brightness of the backlight light source to the preset brightness, according o a comparison result, the largest limitation current of the backlight driving circuit is increased or reduced; simultaneously, the adjusted largest limitation current is used to adjust the duty ratio, the current is maintained to be stable so that the brightness of the backlight light source possesses a large regulation and control scope.
Description
Technical field
The present invention relates to communication technical field, integrated particularly to a kind of control method, control circuit, backlight
Circuit and terminal unit.
Background technology
Electronic displays such as liquid crystal display LCD typically occurs in many mobile electronic devices, LCD screen
The LED lamp string electric current in backlight assembly is depended in brightness, it will usually by the backlight of to multichannel
LED string forms, and LED string is to be driven by backlight driving chip, for pulse width modulation
The backlight driving chip of PWM control mode, it is common that adjusted the electric current being internally integrated by pulse-width modulation circuit
Source, the indirectly electric current on regulation output LED string, thus control LED cross luma degree.
Pulse width modulation (PWM) backlight drive circuit is generally outside a hardware current-limiting resistance R, is used for setting
Fixed maximum current limit I(LED_full), calculate according to below equation:
I(LED_full)=K*R
Wherein K is the coefficient that drive integrated circult IC design parameter is relevant.
The electric current of backlight LED light string is as follows with the relation of PWM duty cycle:
I(LED)=I(LED_full)*Duty(PWM)
Wherein, I(LED)For lamp string stream, Duty(PWM)For inputting the dutycycle of PWM, I(LED_full)For
Maximum current limit.
Usual design driven and technogenic influence, PWM duty cycle input has a minima (such as: 1%),
The precision of chip output current will be affected less than this scope.
If outside maximum current limliting sets too big, being affected by PWM minimum duty cycle, electric current will be unable to be adjusted to
Low, possibly cannot meet minimum LED string and drive the requirement of electric current, thus cause LCD minimum brightness inclined
High；If outside maximum current limliting sets less, the requirement of LED string maximum drive current cannot be met again,
Thus cause LCD high-high brightness on the low side.
Summary of the invention
It is an object of the invention to provide a kind of control method, control circuit, backlight integrated circuit and terminal to set
Standby, solve in prior art owing to the setting of outside maximum current limliting causes the high-high brightness of screen on the low side or
The problem that minimum brightness is less than normal.
In order to achieve the above object, the embodiment of the present invention provides the control method of a kind of backlight drive circuit, institute
State backlight drive circuit to be connected with back light and pulse width modulation circuit, including:
Obtain the present intensity of described back light；
If described present intensity is more than a predetermined luminance, control the maximum current limit of described backlight drive circuit
It is increased to the first current limit, and the dutycycle adjusting described pulse width modulation circuit makes described the brightest
Degree matches with described first current limit；
If described present intensity less than or equal to described predetermined luminance, controls described backlight drive circuit
Big current limit is reduced to the second current limit, and the dutycycle of described adjustment pulse width modulation circuit makes
Described present intensity matches with described second current limit；Wherein,
Described predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first is maximum
Brightness is the high-high brightness of described back light before the maximum current limit adjusting described backlight drive circuit.
Another embodiment of the present invention also provides for the control circuit of a kind of backlight drive circuit, described backlight drive
Circuit is connected with back light and pulse width modulation circuit, including:
Acquisition module, for obtaining the present intensity of described back light；
First control module, if for described present intensity more than a predetermined luminance, controlling described backlight drive
The maximum current limit of circuit is increased to the first current limit, and adjusts accounting for of described pulse width modulation circuit
Empty ratio makes described present intensity match with described first current limit；
Second control module, if for described present intensity less than or equal to described predetermined luminance, controls institute
The maximum current limit stating backlight drive circuit is reduced to the second current limit, and adjusts described pulse width tune
The dutycycle of circuit processed makes described present intensity match with described second current limit；Wherein,
Described predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first is maximum
Brightness is the high-high brightness of described back light before the maximum current limit adjusting described backlight drive circuit.
Another embodiment of the present invention also provides for a kind of integrated electricity of backlight being provided with control circuit as above
Road, described backlight drive circuit also includes:
Backlight drive circuit, described backlight drive circuit includes provides the electric current driving electric current to back light
Output pin；
Described control circuit is for adjusting the maximum restriction of the described electric current output pin of described backlight drive circuit
Electric current.
Another embodiment of the present invention also provides for a kind of terminal unit, including backlight integrated circuit as above.
The technique scheme of the present invention at least has the advantages that
In the control method of the embodiment of the present invention, control circuit, backlight integrated circuit and terminal unit, pass through
Present intensity and a predetermined luminance of back light are compared, thus increases according to comparative result or subtract
The maximum current limit of little backlight drive circuit, adjusts dutycycle according to the maximum current limit after adjusting simultaneously,
Thus keep current stabilization so that the brightness of back light there is bigger modification scope and finer electric current
Control.
Accompanying drawing explanation
Fig. 1 represents the basic step of the control method of the backlight drive circuit that the first embodiment of the present invention provides
Flow chart；
Fig. 2 represents the steps flow chart of the control method of the backlight drive circuit that the second embodiment of the present invention provides
Figure；
Fig. 3 represents the structure chart of the control circuit of the backlight drive circuit that the third embodiment of the present invention provides；
Fig. 4 represents the circuit composition diagram of the backlight integrated circuit that the fourth embodiment of the present invention provides；
Fig. 5 represents one of physical circuit composition diagram of backlight integrated circuit that the fourth embodiment of the present invention provides；
Fig. 6 represents the two of the physical circuit composition diagram of the backlight integrated circuit that the fourth embodiment of the present invention provides；
Fig. 7 represents the three of the physical circuit composition diagram of the backlight integrated circuit that the fourth embodiment of the present invention provides；
Fig. 8 represents the structure chart of the terminal unit that the sixth embodiment of the present invention provides；
Fig. 9 represents the structure chart of the terminal unit that the seventh embodiment of the present invention provides.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with attached
Figure and specific embodiment are described in detail.
First embodiment
As it is shown in figure 1, the first embodiment of the present invention provides the control method of a kind of backlight drive circuit, institute
State backlight drive circuit to be connected with back light and pulse width modulation circuit, including:
Step 101, obtains the present intensity of described back light.
In this step, back light is generally formed to multichannel backlight LED (light emitting diode) lamp string by one.
Then the present intensity of back light is the brightness of backlight LED light string, it is possible to be interpreted as the screen of terminal unit
Or brightness of display screen.
Step 102, if described present intensity is more than a predetermined luminance, controls the maximum of described backlight drive circuit
Current limit is increased to the first current limit, and the dutycycle adjusting pulse width modulation circuit makes described working as
Front brightness matches with described first current limit.
In this step, described predetermined luminance is less than or equal to the first high-high brightness of described back light；Institute
Stating the first high-high brightness is described back light before the maximum current limit adjusting described backlight drive circuit
High-high brightness.Such as before not adjusting, the high-high brightness of backlight drive circuit is 5, then this predetermined luminance must be little
In or equal to 5, i.e. predetermined luminance can be 5,4 etc., and differ a citing at this.
In this step, if present intensity is more than predetermined luminance, it is determined that now maximum current limit cannot
Meet user and continue to increase the demand of brightness, therefore the control method that the embodiment of the present invention provides controls backlight drive
The maximum current limit of circuit is increased to the first current limit.Due to the adjustment of maximum current limit, also need to adjust
Whole dutycycle makes current stabilization, accounts for when making to tune up brightness further as the increase of maximum current limit
The control accuracy of empty ratio attenuates, and brightness and the electric current of back light are the most more stable.
Such as, before adjusting, the maximum current limit of backlight drive circuit is 5mA, the driving that present intensity is corresponding
Electric current is 2mA, and now dutycycle is 40%；Present intensity is more than predetermined luminance, then increase maximum and limit electricity
Stream is 20mA, and now needing to adjust dutycycle is 10% so that present intensity matches with 20mA.
Step 103, if described present intensity is less than or equal to described predetermined luminance, controls described backlight drive
The maximum current limit of circuit is reduced to the second current limit, and adjusts the dutycycle of pulse width modulation circuit
Described present intensity is matched with described second current limit；Wherein,
Described predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first is maximum
Brightness is the high-high brightness of described back light before the maximum current limit adjusting described backlight drive circuit.
In this step, predetermined luminance is consistent with the predetermined luminance in above-mentioned steps 102, does not repeats at this to repeat.
If present intensity is less than predetermined luminance, it is determined that now maximum current limit cannot meet user and continues to subtract
The demand of little brightness, therefore the control method of embodiment of the present invention offer controls the maximum restriction of backlight drive electric current
Electric current is reduced to the second current limit.Due to the adjustment of maximum current limit, also need to adjust dutycycle and make
Current stabilization, the control accuracy of dutycycle when making to reduce brightness further as the reduction of maximum current limit
Attenuating, brightness and the electric current of back light are the most more stable.
Such as, before adjusting, the maximum current limit of light drive circuit is 20mA, the driving electricity that present intensity is corresponding
Stream is 2mA, and now dutycycle is 10%；Present intensity is less than predetermined luminance, then reduce maximum current limit
For 5mA, now needing to adjust dutycycle is 40% so that present intensity matches with 5mA.
The first embodiment of the present invention, by the switching of different maximum current limits, extends backlight drive electric current
Scope, solve PWM backlight drive and limit due to min/max PWM duty cycle, it is impossible to export little/big
The problem of electric current.
Concrete, under different maximum current limits, dutycycle is as shown in table 1 with the relation table driving electric current:
Dutycycle and the relation driving electric current under the maximum current limit that table 1 is different
When driving electric current >=5mA that present intensity is corresponding, it is switched to the maximum limit flow valuve of 20mA, 1%～100%
Range of accommodation in, the electric current range of accommodation of 0.2～20mA can be realized；When driving electric current≤5mA, cut
Change to the maximum limit flow valuve of 5mA, in the range of accommodation of 1%～100%, the electric current of 0.05～5mA can be realized
Range of accommodation.
Concrete, in the first embodiment of the present invention, step 101 includes:
Step 1011, obtains the present drive current of back light；
Step 1012, determines the present intensity of described back light according to present drive current.
In the above embodiment of the present invention, the present drive current that can first obtain back light determines present intensity again,
Can also directly obtain the present intensity of backlight drive circuit, thus by present intensity and predetermined luminance comparison.
It should be noted that the present intensity that can also first obtain back light in the embodiment of the present invention determines currently again
Drive electric current, now the pre-set current value that present drive current is corresponding with above-mentioned predetermined luminance can be compared.
Owing to brightness and the current value of its back light are relation one to one, then step 101 only obtains backlight
The present current value of light source, and the method compared with pre-set current value by present current value is also the guarantor of the application
In the range of protecting.
Second embodiment
As in figure 2 it is shown, the second embodiment of the present invention also provides for the control method of a kind of backlight drive circuit,
Described backlight drive circuit is connected with back light and pulse width modulation circuit, including:
Step 201, obtains the present intensity of described back light.
In this step, the back light of backlight drive circuit generally by one to multichannel backlight LED (light-emitting diodes
Pipe) lamp string composition.Then the present intensity of back light is the brightness of backlight LED light string, it is possible to be interpreted as
The screen of terminal unit or brightness of display screen.
Step 202, if described present intensity is more than a predetermined luminance, controls the current limliting of described backlight drive circuit
The resistance of the current-limiting resistance of circuit reduces so that the maximum current limit of described backlight drive circuit is increased to the
One current limit.
In this step, concrete restriction reaches to increase the purpose of maximum current limit, example by reducing current-limiting resistance
If source current-limiting resistance is 5 Ω, it is reduced to 2 Ω then maximum current limit and is increased to the first current limit.
Step 203, if described present intensity is less than or equal to described predetermined luminance, controls described backlight drive
The resistance of the current-limiting resistance of the current-limiting circuit of circuit increases so that the maximum of described backlight drive circuit limits electricity
Stream is reduced to the second current limit.
In this step, concrete restriction reaches to reduce the purpose of maximum current limit, example by increasing current-limiting resistance
If source current-limiting resistance is 2 Ω, it is reduced to 5 Ω then maximum current limit and is reduced to the second current limit.
Concrete, the second embodiment of the present invention provides three kinds of methods increased or reduce current-limiting resistance, tool
Body, the first is: the current-limiting circuit of described backlight drive circuit includes: a variable resistance, by controlling
Described variable-resistance resistance size adjusts the resistance size of the current-limiting resistance of described current-limiting circuit；Employing can
During power transformation resistance, the relation of resistance value and maximum current limit need to be preset, i.e. preset different current limlitings
Gear, such as terminal unit include 2 current limliting gears, and the maximum current limit of the first gear is I1, first grade
During position, this variable-resistance resistance is R1；The current limit of the second gear is I2, during the second gear, this can power transformation
That hinders is organized as R2, if I1<I2, then R1 > R2.
Or, the second is: the current-limiting circuit of described backlight drive circuit includes: the first resistance, the second electricity
Resistance and the first on-off circuit；Wherein, after the second resistance and the first switching circuit in series with the first resistance also
Connection, adjusts the resistance of the current-limiting resistance of described current-limiting circuit by the unlatching and Guan Bi controlling the first on-off circuit
Value size；When using the second way, the unlatching of the first on-off circuit and Guan Bi and maximum limit need to be preset
Determining the relation of electric current, the unlatching and the Guan Bi that i.e. preset the first on-off circuit work as, from different current limlitings, the pass asked
System；Such as terminal unit includes 2 current limliting gears, and the maximum current limit of the first gear is I1, the first gear
Time this first on-off circuit open, now current-limiting resistance is the first resistance；The maximum current limit of the second gear
For I2, during the second gear, this first on-off circuit cuts out, now current-limiting resistance be the first resistance and the second resistance also
The resistance that connection obtains, and I1<I2。
Or, the third is: the current-limiting circuit of described backlight drive circuit includes: the 3rd resistance, the 4th electricity
Resistance and second switch circuit；Wherein, after described 4th resistance and described second switch circuit in parallel with institute
State tertiary circuit series connection, adjust described current-limiting circuit by the unlatching and Guan Bi controlling second switch circuit
The resistance size of current-limiting resistance.When using the third mode, need to preset second switch circuit unlatching and
Guan Bi and the relation of maximum current limit, i.e. preset the unlatching of second switch circuit and close from different
Current limliting is when the relation asked；Such as terminal unit includes 2 current limliting gears, the maximum current limit of the first gear
For I1, during the first gear, this second switch circuit is opened, and now current-limiting resistance is the 3rd resistance and the 4th resistance
The resistance that series connection obtains；The current limit of the second gear is I2, during the second gear, this second switch circuit is closed,
Now current-limiting resistance is the 3rd resistance, and I1<I2。
To sum up, the second embodiment of the present invention provide control method in by obtain current system brightness or
Lamp string flow valuve, if brightness value or current value are less than a certain threshold value, switches to maximum spacing electric current relatively low
The cut-off current of gear, adjusts PWM duty cycle simultaneously, in order to keep current stabilization；Whereas if brightness value
Or current value is higher than a certain threshold value, switches to the cut-off current of maximum spacing electric current higher gear, adjusts simultaneously
PWM duty cycle, in order to keep current stabilization；Extend the scope of backlight drive electric current, and can be finer
Control backlight drive electric current.
3rd embodiment
As it is shown on figure 3, the third embodiment of the present invention provides the control circuit of a kind of backlight drive circuit, institute
Stating backlight drive circuit to be connected with back light and pulse width modulation circuit, described control circuit includes:
Acquisition module 301, for obtaining the present intensity of described back light；
First control module 302, if for described present intensity more than a predetermined luminance, controlling described backlight and drive
The maximum current limit on galvanic electricity road is increased to the first current limit, and adjusts the duty of pulse width modulation circuit
Match with described first current limit than making described present intensity；
Second control module 303, if for described present intensity less than or equal to described predetermined luminance, controls
The maximum current limit of described backlight drive circuit is reduced to the second current limit, and adjusts pulse width modulation
The dutycycle of circuit makes described present intensity match with described second current limit；Wherein,
Described predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first is maximum
Brightness is the high-high brightness of described back light before the maximum current limit adjusting described backlight drive circuit.
Concrete, acquisition module 301 described in the third embodiment of the present invention includes:
Electric current acquiring unit, for obtaining the present drive current of described back light；
Brightness determines unit, for determining the present intensity of described back light according to present drive current.
Concrete, described in the third embodiment of the present invention, the first control module 302 includes:
First control unit, if for described present intensity more than a predetermined luminance, controlling described backlight drive
The resistance of the current-limiting resistance of the current-limiting circuit of circuit reduces so that the maximum of described backlight drive circuit limits electricity
Stream is increased to the first current limit.
Concrete, described in the third embodiment of the present invention, the second control module 303 includes:
Second control unit, if for described present intensity less than or equal to described predetermined luminance, controls institute
The resistance of the current-limiting resistance stating the current-limiting circuit of backlight drive circuit increases so that described backlight drive circuit
Maximum current limit is reduced to the second current limit.
To sum up, what the third embodiment of the present invention provided control in device by obtain current system brightness or
Lamp string flow valuve, if brightness value or current value are less than a certain threshold value, switches to maximum spacing electric current relatively low
The cut-off current of gear, adjusts PWM duty cycle simultaneously, in order to keep current stabilization；Whereas if brightness value
Or current value is higher than a certain threshold value, switches to the cut-off current of maximum spacing electric current higher gear, adjusts simultaneously
PWM duty cycle, in order to keep current stabilization；Extend the scope of backlight drive electric current, and can be finer
Control backlight drive electric current.
It should be noted that the control circuit of the backlight drive circuit of third embodiment of the present invention offer is should
The control circuit of the control method of the backlight drive circuit provided by above-mentioned first embodiment and the second embodiment,
All embodiments of the control method of the most above-mentioned backlight drive circuit are all applicable to the control of this backlight control circuit
Circuit, and all can reach same or analogous beneficial effect.
4th embodiment
As shown in Figure 4, the fourth embodiment of the present invention provides a kind of and is provided with control circuit as above
Backlight integrated circuit, it is characterised in that described backlight integrated circuit also includes:
Backlight drive circuit, described backlight drive circuit includes provides the electric current driving electric current to back light
Output pin RT；
Described control circuit is for adjusting the maximum current limit of the electric current output pin of described backlight drive circuit.
Control circuit is according to the relativity of the present intensity Yu predetermined luminance judging back light, thus utilizes control
Signal adjusts maximum current limit.
Concrete, described backlight integrated circuit also includes:
Current-limiting circuit；Described control circuit is come by the resistance size adjusting the current-limiting resistance of described current-limiting circuit
Adjust the maximum current limit of described electric current output pin.
Accordingly, the fourth embodiment of the present invention provide three kinds of circuit implementations increase or reduce maximum
Current limit:
The first, as it is shown in figure 5, described current-limiting circuit includes: a variable resistance, described variable-resistance
One end is connected with described electric current output pin, and the other end is connected with described control circuit.
Control circuit controls variable resistance by control signal and changes current limliting resistance, thus realize different
Big current limit.
The second, as shown in Figure 6, uses parallel way to arrange, and the most described current-limiting circuit includes: the first electricity
Resistance R1, the second resistance R2 and the first on-off circuit: wherein,
First end of described first resistance R1 is connected with described electric current output pin RT, described first resistance T1
The second end ground connection；First end of described second resistance R2 is connected with described electric current output pin RT, described
Second end of the second resistance R2 is connected with the first end of described first on-off circuit, described first on-off circuit
Second end ground connection, the 3rd end of described first on-off circuit is connected with described control circuit.
Concrete, described first on-off circuit is the first transistor and the first diode；Wherein,
The grid G of described the first transistor is the 3rd end of described first on-off circuit, described the first transistor
The second end that source S is described first on-off circuit, the drain D of described the first transistor is described first
First end of on-off circuit, the source S of described the first transistor is connected with the positive pole of described first diode,
The negative pole of described first diode is connected with the drain D of described the first transistor.
When control signal is high level, metal-oxide-semiconductor turns on, resistance in parallel for R1 and R1 determine maximum limit
Determining electric current is I2；When control signal is low level, metal-oxide-semiconductor is closed, the resistance of R1 determine maximum limit
Determining electric current is I1；Then I2>I1。
The second, as it is shown in fig. 7, use series system to arrange, i.e. described current-limiting circuit includes: the 3rd
Resistance R3, the 4th resistance R4 and second switch circuit；Wherein,
First end of described 3rd resistance R3 is connected with described electric current output pin, described 3rd resistance R3's
Second end is connected with first end of described 4th resistance R4 and the first end of described second switch circuit respectively, institute
State the second end ground connection of the 4th resistance 45, the second end ground connection of described second switch circuit, described second switch
The 3rd end be connected with described control circuit.
Concrete, described second switch circuit is transistor seconds and the second diode；Wherein,
The grid G of described transistor seconds is the 3rd end of described second switch circuit, described transistor seconds
The second end that source S is described second switch circuit, the drain D of described transistor seconds is described second
First end of on-off circuit, the source S of described transistor seconds is connected with the positive pole of described second diode,
The negative pole of described second diode is connected with the drain D of described transistor seconds.
When control signal is high level, metal-oxide-semiconductor turns on, the resistance of R3 determine that maximum current limit is
I2；When control signal is low level, metal-oxide-semiconductor is closed, the resistance of R3 and R4 series connection determine maximum limit
Determining electric current is I1；Then I2>I1。
The fourth embodiment of the present invention uses a configurable current-limiting circuit, outside being controlled by a control signal
The resistance of portion's current-limiting resistance, realizes different cut-off currents, thus meets backlight drive in the larger context
The requirement of electric current.
5th embodiment
In order to preferably realize above-mentioned purpose, the fifth embodiment of the present invention also provides for a kind of terminal unit, bag
Include backlight integrated circuit as above.
It should be noted that the terminal unit that the fifth embodiment of the present invention provides is to include that above-mentioned backlight is integrated
The terminal unit of circuit, all embodiments of the most above-mentioned backlight integrated circuit are all applicable to this terminal unit, and
All can reach same or analogous beneficial effect.
Sixth embodiment
It is the block diagram of the terminal unit of sixth embodiment of the invention as shown in Figure 8.Terminal unit shown in Fig. 8
800 include: at least one processor 801, memorizer 802, at least one network interface 804 and other use
Family interface 803.Each assembly in terminal unit 800 is coupled by bus system 805.It is understood that
Bus system 805 is for realizing the connection communication between these assemblies.Bus system 805 is except including that data are total
Outside line, also include power bus, control bus and status signal bus in addition.But for the sake of understanding explanation,
In fig. 8 various buses are all designated as bus system 805.
Wherein, user interface 803 can include display, keyboard or pointing device (such as, mouse, rail
Mark ball (trackball), touch-sensitive plate or touch screen etc..
The memorizer 802 being appreciated that in the embodiment of the present invention can be volatile memory or non-volatile
Memorizer, maybe can include volatibility and nonvolatile memory.Wherein, nonvolatile memory is permissible
It is read only memory (Read-OnlyMemory, ROM), programmable read only memory
(ProgrammableROM, PROM), Erasable Programmable Read Only Memory EPROM (ErasablePROM,
EPROM), Electrically Erasable Read Only Memory (ElectricallyEPROM, EEPROM) or flash memory.
Volatile memory can be random access memory (RandomAccessMemory, RAM), and it is used as outward
Portion's cache.By exemplary but be not restricted explanation, the RAM of many forms can use, such as static
Random access memory (StaticRAM, SRAM), dynamic random access memory (DynamicRAM,
DRAM), Synchronous Dynamic Random Access Memory (SynchronousDRAM, SDRAM), double data speed
Rate Synchronous Dynamic Random Access Memory (DoubleDataRate SDRAM, DDRSDRAM), enhancement mode are same
Step dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronized links dynamic randon access
Memorizer (SynchlinkDRAM, SLDRAM) and direct rambus random access memory
(DirectRambusRAM, DRRAM).The memorizer 802 of system and method described herein is intended to include
But it is not limited to these and the memorizer of other applicable type any.
In some embodiments, memorizer 802 stores following element, executable module or data
Structure, or their subset, or their superset: operating system 8021 and application program 8022.
Wherein, operating system 8021, comprise various system program, such as ccf layer, core library layer, driving
Layers etc., are used for realizing various basic business and processing hardware based task.Application program 8022, comprises
Various application programs, such as media player (MediaPlayer), browser (Browser) etc., be used for realizing respectively
Plant applied business.The program realizing embodiment of the present invention method may be embodied in application program 8022.
In embodiments of the present invention, by calling program or the instruction of memorizer 802 storage, concrete, can
To be program or the instruction of storage in application program 8022, processor 801 is for obtaining described back light
Present intensity；If described present intensity is more than a predetermined luminance, control the maximum limit of described backlight drive circuit
Determine electric current and be increased to the first current limit, and the dutycycle adjusting pulse width modulation circuit make described currently
Brightness matches with described first current limit；If described present intensity is less than or equal to described predetermined luminance,
The maximum current limit controlling described backlight drive circuit is reduced to the second current limit, and adjusts pulse width
The dutycycle of modulation circuit makes described present intensity match with described second current limit；Wherein, described
Predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first high-high brightness is for adjusting
The high-high brightness of described back light before the maximum current limit of whole described backlight drive circuit.
The method that the invention described above embodiment discloses can apply in processor 801, or by processor 801
Realize.Processor 801 is probably a kind of IC chip, has the disposal ability of signal.Realizing
Cheng Zhong, each step of said method can be by the integrated logic circuit of the hardware in processor 801 or soft
The instruction of part form completes.Above-mentioned processor 801 can be general processor, digital signal processor
(DigitalSignalProcessor, DSP), special IC (ApplicationSpecific IntegratedCircuit,
ASIC), ready-made programmable gate array (FieldProgrammableGateArray, FPGA) or other can compile
Journey logical device, discrete gate or transistor logic, discrete hardware components.Can realize or perform
Disclosed each method, step and logic diagram in the embodiment of the present invention.General processor can be micro-process
Device or this processor can also be the processors etc. of any routine.In conjunction with the side disclosed in the embodiment of the present invention
The step of method can be embodied directly in hardware decoding processor and perform, or hard with in decoding processor
Part and software module combination execution complete.Software module may be located at random access memory, flash memory, read-only storage
Device, ripe the depositing in this area such as programmable read only memory or electrically erasable programmable memorizer, depositor
In storage media.This storage medium is positioned at memorizer 802, and processor 801 reads the information in memorizer 802,
The step of said method is completed in conjunction with its hardware.
It is understood that embodiments described herein can use hardware, software, firmware, middleware,
Microcode or a combination thereof realize.Realizing for hardware, processing unit can be implemented in one or more special collection
Become circuit (ApplicationSpecificIntegratedCircuits, ASIC), digital signal processor
(DigitalSignalProcessing, DSP), digital signal processing appts (DSPDevice, DSPD), can compile
Journey logical device (ProgrammableLogicDevice, PLD), field programmable gate array
(Field-ProgrammableGateArray, FPGA), general processor, controller, microcontroller, Wei Chu
Manage device, in other electronic unit or a combination thereof performing herein described function.
Software is realized, can come real by the module (such as process, function etc.) performing function described herein
Existing the techniques described herein.Software code is storable in performing in memorizer and by processor.Memorizer can
Within a processor or to realize outside processor.
Alternatively, as another embodiment, processor 801 is additionally operable to obtain the current of described back light
Drive electric current；The present intensity of described back light is determined according to present drive current.
Alternatively, as another embodiment, if processor 801 is additionally operable to described present intensity more than one pre-
If brightness, the current-limiting resistance of the current-limiting circuit controlling described backlight drive circuit reduces so that described backlight is driven
The maximum current limit on galvanic electricity road is increased to the first current limit.
Alternatively, as another embodiment, if processor 801 be additionally operable to described present intensity less than or
Equal to described predetermined luminance, the current-limiting resistance of the current-limiting circuit controlling described backlight drive circuit increases so that
The maximum current limit of described backlight drive circuit is reduced to the second current limit.
Terminal unit 800 is capable of each process that in previous embodiment, terminal unit realizes, for avoiding weight
Multiple, repeat no more here.
The terminal unit that the sixth embodiment of the present invention provides is by obtaining current system brightness or lamp string stream
Value, if brightness value or current value are less than a certain threshold value, switches to the maximum spacing electric current limit compared with low-grade location
Flow valuve, adjusts PWM duty cycle simultaneously, in order to keep current stabilization；Whereas if brightness value or current value
Higher than a certain threshold value, switch to the cut-off current of maximum spacing electric current higher gear, adjust PWM duty simultaneously
Ratio, in order to keep current stabilization；Extend the scope of backlight drive electric current, and can the finer control back of the body
Optical drive electric current.
7th embodiment
Fig. 9 is the structural representation of the terminal unit of another embodiment of the present invention.Specifically, in Fig. 9
Terminal unit 900 can be mobile phone, panel computer, personal digital assistant (PersonalDigital Assistant,
Or vehicle-mounted computer etc. PDA).
Terminal unit 900 in Fig. 9 include radio frequency (RadioFrequency, RF) circuit 910, memorizer 920,
Input block 930, display unit 940, processor 960, voicefrequency circuit 970, WiFi (WirelessFidelity)
Module 980 and power supply 990.
Wherein, input block 930 can be used for receive user input numeral or character information, and produce with
The user setup of terminal unit 900 and function control relevant signal input.Specifically, the present invention implements
In example, this input block 930 can include contact panel 931.Contact panel 931, also referred to as touch screen,
Can collect user thereon or neighbouring touch operation (such as user uses any applicable thing such as finger, stylus
Body or adnexa operation on contact panel 931), and connect dress accordingly according to formula set in advance driving
Put.Optionally, contact panel 931 can include touch detecting apparatus and two parts of touch controller.Wherein,
The touch orientation of touch detecting apparatus detection user, and detect the signal that touch operation brings, by signal transmission
To touch controller；Touch controller receives touch information from touch detecting apparatus, and is converted into touching
Point coordinates, then give this processor 960, and order that processor 960 sends can be received and performed.This
Outward, the polytypes such as resistance-type, condenser type, infrared ray and surface acoustic wave can be used to realize contact panel
931.Except contact panel 931, input block 930 can also include other input equipments 932, and other are defeated
Enter equipment 932 and can include but not limited to physical keyboard, function key (such as volume control button, switch key
Deng), trace ball, mouse, one or more in action bars etc..
Wherein, display unit 940 can be used for the information that inputted by user of display or the information that is supplied to user with
And the various menu interfaces of terminal unit 900.Display unit 940 can include display floater 941, optionally,
The form such as LCD or Organic Light Emitting Diode (OrganicLight-EmittingDiode, OLED) can be used
Configure display floater 941.
It should be noted that contact panel 931 can cover display floater 941, formed and touch display screen, when this touch
Display screen detects thereon or after neighbouring touch operation, sends processor 960 to determine touch event
Type, display screen on provide corresponding vision according to the type of touch event touching with preprocessor 960
Output.
Touch display screen and include Application Program Interface viewing area and conventional control viewing area.This Application Program Interface
The arrangement mode of viewing area and this conventional control viewing area does not limit, can be arranged above and below, left-right situs
Etc. the arrangement mode that can distinguish two viewing areas.This Application Program Interface viewing area is displayed for application
The interface of program.Each interface can comprise icon and/or the widget desktop control of at least one application program
The interface elements such as part.This Application Program Interface viewing area can also be the empty interface not comprising any content.Should
Conventional control viewing area is for showing the control that utilization rate is higher, such as, and settings button, interface numbering, rolling
The dynamic application icon etc. such as bar, phone directory icon.
Wherein processor 960 is the control centre of terminal unit 900, utilizes various interface and connection whole
The various piece of individual mobile phone, by run or perform be stored in the software program in first memory 921 and/or
Module, and call the data being stored in second memory 922, perform the various merits of terminal unit 900
And data can be processed, thus terminal unit 900 is carried out integral monitoring.Optionally, processor 960 can wrap
Include one or more processing unit.
In embodiments of the present invention, by calling the software program and/or mould stored in this first memory 921
Data in block and/or this second memory 922, processor 960 is for obtaining the current of described back light
Brightness；If described present intensity is more than a predetermined luminance, controls the maximum of described backlight drive circuit and limit electricity
Stream is increased to the first current limit, and the dutycycle adjusting pulse width modulation circuit makes described present intensity
Match with described first current limit；If described present intensity is less than or equal to described predetermined luminance, control
The maximum current limit making described backlight drive circuit is reduced to the second current limit, and adjusts pulse width tune
The dutycycle of circuit processed makes described present intensity match with described second current limit；Wherein, described pre-
If brightness is less than or equal to the first high-high brightness of described back light；Described first high-high brightness is for adjusting
The high-high brightness of described back light before the maximum current limit of described backlight drive circuit.
Alternatively, as another embodiment, processor 960 is additionally operable to obtain the current of described back light
Drive electric current；The present intensity of described back light is determined according to present drive current.
Alternatively, as another embodiment, if processor 960 is additionally operable to described present intensity more than one pre-
If brightness, the current-limiting resistance of the current-limiting circuit controlling described backlight drive circuit reduces so that described backlight is driven
The maximum current limit on galvanic electricity road is increased to the first current limit.
Alternatively, as another embodiment, if processor 960 be additionally operable to described present intensity less than or
Equal to described predetermined luminance, the current-limiting resistance of the current-limiting circuit controlling described backlight drive circuit increases so that
The maximum current limit of described backlight drive circuit is reduced to the second current limit.
Visible, the terminal unit that the seventh embodiment of the present invention provides is by obtaining current system brightness or lamp
String current value, if brightness value or current value are less than a certain threshold value, switches to maximum spacing electric current more low-grade
The cut-off current of position, adjusts PWM duty cycle simultaneously, in order to keep current stabilization；Whereas if brightness value or
Current value is higher than a certain threshold value, switches to the cut-off current of maximum spacing electric current higher gear, adjusts simultaneously
PWM duty cycle, in order to keep current stabilization；Extend the scope of backlight drive electric current, and can be finer
Control backlight drive electric current.
Those of ordinary skill in the art are it is to be appreciated that combine respectively showing of the embodiments described herein description
The unit of example and algorithm steps, it is possible to come with the combination of electronic hardware or computer software and electronic hardware
Realize.These functions perform with hardware or software mode actually, depend on the application-specific of technical scheme
And design constraint.Each specifically should being used for can be used different methods to realize by professional and technical personnel
Described function, but this realization is it is not considered that beyond the scope of this invention.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, and foregoing description
The specific works process of system, device and unit, be referred to the corresponding process in preceding method embodiment,
Do not repeat them here.
In embodiment provided herein, it should be understood that disclosed apparatus and method, Ke Yitong
The mode crossing other realizes.Such as, device embodiment described above is only schematically, such as,
The division of described unit, is only a kind of logic function and divides, and actual can have other division side when realizing
Formula, the most multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can
To ignore, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or logical
Letter connection can be the INDIRECT COUPLING by some interfaces, device or unit or communication connection, can be electrical,
Machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, as
The parts that unit shows can be or may not be physical location, i.e. may be located at a place, or
Can also be distributed on multiple NE.Can select therein some or all of according to the actual needs
Unit realizes the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit,
Can also be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit
In.
If described function is using the form realization of SFU software functional unit and as independent production marketing or use,
Can be stored in a computer read/write memory medium.Based on such understanding, the technical side of the present invention
Part or the part of this technical scheme that prior art is contributed by case the most in other words can be with softwares
The form of product embodies, and this computer software product is stored in a storage medium, including some fingers
Order is with so that a computer equipment (can be personal computer, server, or the network equipment etc.) is held
All or part of step of method described in each embodiment of the row present invention.And aforesaid storage medium includes: U
The various media that can store program code such as dish, portable hard drive, ROM, RAM, magnetic disc or CD.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art, in the technical scope that the invention discloses, can readily occur in change
Or replace, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention Ying Yiquan
The protection domain that profit requires is as the criterion.
The above is the preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from principle of the present invention, it is also possible to make some improvements and modifications,
These improvements and modifications also should be regarded as protection scope of the present invention.
Claims (17)
1. a control method for backlight drive circuit, described backlight drive circuit and back light and pulse width
Degree modulation circuit connects, it is characterised in that including:
Obtain the present intensity of described back light；
If described present intensity is more than a predetermined luminance, control the maximum current limit of described backlight drive circuit
It is increased to the first current limit, and the dutycycle adjusting described pulse width modulation circuit makes described the brightest
Degree matches with described first current limit；
If described present intensity less than or equal to described predetermined luminance, controls described backlight drive circuit
Big current limit is reduced to the second current limit, and the dutycycle of described adjustment pulse width modulation circuit makes
Described present intensity matches with described second current limit；Wherein,
Described predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first is maximum
Brightness is the high-high brightness of described back light before the maximum current limit adjusting described backlight drive circuit.
2. control method as claimed in claim 1, it is characterised in that obtain the current of described back light
The step of brightness includes:
Obtain the present drive current of described back light；
The present intensity of described back light is determined according to present drive current.
3. control method as claimed in claim 1, it is characterised in that if described present intensity is pre-more than
If brightness, the maximum current limit controlling described backlight drive circuit is increased to the step bag of the first current limit
Include:
If described present intensity is more than a predetermined luminance, control in the current-limiting circuit of described backlight drive circuit
The resistance of current-limiting resistance reduces so that the maximum current limit of described backlight drive circuit is increased to the first restriction
Electric current.
4. control method as claimed in claim 1, it is characterised in that if described present intensity less than or
Equal to described predetermined luminance, the maximum current limit controlling described backlight drive circuit is reduced to the second restriction electricity
The step of stream includes:
If described present intensity is less than or equal to described predetermined luminance, control the limit of described backlight drive circuit
The resistance of the current-limiting resistance in current circuit increases so that the maximum current limit of described backlight drive circuit reduces
It it is the second current limit.
5. the control method as described in claim 3 or 4, it is characterised in that described backlight drive circuit
Current-limiting circuit includes: a variable resistance, adjusts described limit by controlling described variable-resistance resistance size
The resistance size of the current-limiting resistance of current circuit；Or,
The current-limiting circuit of described backlight drive circuit includes: the first resistance, the second resistance and the first switch electricity
Road；Wherein, with the first resistor coupled in parallel after the second resistance and the first switching circuit in series, by controlling first
The unlatching of on-off circuit and Guan Bi adjust the resistance size of the current-limiting resistance of described current-limiting circuit；Or,
The current-limiting circuit of described backlight drive circuit includes: the 3rd resistance, the 4th resistance and second switch electricity
Road；Wherein, connect with described tertiary circuit after described 4th resistance and described second switch circuit in parallel,
The resistance of current-limiting resistance adjusting described current-limiting circuit by the unlatching and Guan Bi that control second switch circuit is big
Little.
6. a control circuit for backlight drive circuit, described backlight drive circuit and back light and pulse width
Degree modulation circuit connects, it is characterised in that described control circuit includes:
Acquisition module, for obtaining the present intensity of described back light；
First control module, if for described present intensity more than a predetermined luminance, controlling described backlight drive
The maximum current limit of circuit is increased to the first current limit, and adjusts accounting for of described pulse width modulation circuit
Empty ratio makes described present intensity match with described first current limit；
Second control module, if for described present intensity less than or equal to described predetermined luminance, controls institute
The maximum current limit stating backlight drive circuit is reduced to the second current limit, and adjusts described pulse width tune
The dutycycle of circuit processed makes described present intensity match with described second current limit；Wherein,
Described predetermined luminance is less than or equal to the first high-high brightness of described back light；Described first is maximum
Brightness is the high-high brightness of described back light before the maximum current limit adjusting described backlight drive circuit.
7. control circuit as claimed in claim 6, it is characterised in that described acquisition module includes:
Electric current acquiring unit, for obtaining the present drive current of described back light；
Brightness determines unit, for determining the present intensity of described back light according to present drive current.
8. control circuit as claimed in claim 6, it is characterised in that described first control module includes:
First control unit, if for described present intensity more than a predetermined luminance, controlling described backlight drive
The resistance of the current-limiting resistance of the current-limiting circuit of circuit reduces so that the maximum of described backlight drive circuit limits electricity
Stream is increased to the first current limit.
9. control circuit as claimed in claim 6, it is characterised in that described second control module includes:
Second control unit, if for described present intensity less than or equal to described predetermined luminance, controls institute
The resistance of the current-limiting resistance stating the current-limiting circuit of backlight drive circuit increases so that described backlight drive circuit
Maximum current limit is reduced to the second current limit.
10. the backlight integrated circuit just like the control circuit described in any one of claim 6-9 is set, its
Being characterised by, described backlight integrated circuit also includes:
Backlight drive circuit, described backlight drive circuit includes provides the electric current driving electric current to back light
Output pin；
Described control circuit is for adjusting the maximum current limit of the electric current output pin of described backlight drive circuit.
11. backlight integrated circuits as claimed in claim 10, it is characterised in that described backlight integrated circuit
Also include:
Current-limiting circuit；
Described control circuit adjusts described electricity by the resistance size adjusting the current-limiting resistance of described current-limiting circuit
The maximum current limit of stream output pin.
12. backlight integrated circuits as claimed in claim 11, it is characterised in that described current-limiting circuit includes:
One variable resistance, described variable-resistance one end is connected with described electric current output pin, the other end and described control
Circuit processed connects.
13. backlight integrated circuits as claimed in claim 11, it is characterised in that described current-limiting circuit includes:
First resistance, the second resistance and the first on-off circuit: wherein,
First end of described first resistance is connected with described electric current output pin, the second end of described first resistance
Ground connection；First end of described second resistance is connected with described electric current output pin, the second of described second resistance
End is connected with the first end of described first on-off circuit, and the second end ground connection of described first on-off circuit is described
3rd end of the first on-off circuit is connected with described control circuit.
14. backlight integrated circuits as claimed in claim 13, it is characterised in that described first on-off circuit
For the first transistor and the first diode；Wherein,
The grid of described the first transistor is the 3rd end of described first on-off circuit, described the first transistor
Source electrode is the second end of described first on-off circuit, and the drain electrode of described the first transistor is described first switch electricity
First end on road, the source electrode of described the first transistor is connected with the positive pole of described first diode, and described first
The negative pole of diode is connected with the drain electrode of described the first transistor.
15. backlight integrated circuits as claimed in claim 11, it is characterised in that described current-limiting circuit includes:
3rd resistance, the 4th resistance and second switch circuit；Wherein,
First end of described 3rd resistance is connected with described electric current output pin, the second end of described 3rd resistance
It is connected with the first end of described 4th resistance and the first end of described second switch circuit respectively, described 4th electricity
Resistance the second end ground connection, the second end ground connection of described second switch circuit, the 3rd end of described second switch with
Described control circuit connects.
16. backlight integrated circuits as claimed in claim 15, it is characterised in that described second switch circuit
For transistor seconds and the second diode；Wherein,
The grid of described transistor seconds is the 3rd end of described second switch circuit, described transistor seconds
Source electrode is the second end of described second switch circuit, and the drain electrode of described transistor seconds is described second switch electricity
First end on road, the source electrode of described transistor seconds is connected with the positive pole of described second diode, and described second
The negative pole of diode is connected with the drain electrode of described transistor seconds.
17. 1 kinds of terminal units, it is characterised in that include the backlight as described in any one of claim 10-16
Integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405456.5A CN105913810A (en) | 2016-06-08 | 2016-06-08 | Control method, control circuit, backlight integration circuit and terminal equipment |
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|---|---|---|---|
| CN201610405456.5A CN105913810A (en) | 2016-06-08 | 2016-06-08 | Control method, control circuit, backlight integration circuit and terminal equipment |
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Application publication date: 20160831 |