CN102855849B - Liquid crystal backlight driving current control device - Google Patents
Liquid crystal backlight driving current control device Download PDFInfo
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- CN102855849B CN102855849B CN201210350405.9A CN201210350405A CN102855849B CN 102855849 B CN102855849 B CN 102855849B CN 201210350405 A CN201210350405 A CN 201210350405A CN 102855849 B CN102855849 B CN 102855849B
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Abstract
The invention discloses a liquid crystal backlight driving current control device which comprises a control unit, a level switch unit and a constant-current unit. The level switch unit is connected with the control unit and used for receiving control levels outputted by the control unit on the basis of acquired control signals and generating a reference level based on the control levels. The constant-current unit is connected with the level switch unit and used for receiving the reference level and generating currents at least including a first current a second current on the basis of the reference level, wherein a first current value of the first current and a second current value of the second current are different current values.
Description
Technical field
The present invention relates to field of liquid crystal display, particularly relate to LCD backlight drive current control field.
Background technology
3D (D:Dimension, the meaning of dimension, dimension) display is as a kind of emerging display mode, more three-dimensional true to nature because comparing common 2D display frame, allows spectators have sensation on the spot in person and to enjoy the parent of consumer to look at.
And the TV programme major part that current cable TV station plays or 2D picture, 3D picture is also fewer, and wanting to watch 3D picture needs the 2D picture by TV station transmits to convert 3D picture to show.Therefore, consumer is also more and more higher for the requirement of LCD TV, wish that the LCD TV bought can either be watched 2D picture and can be watched 3D picture again, thus, LCD TV producer is exploitation 2D and 3D switchable liquid crystal TV as possible, make buyer when watching can according to oneself need switch display mode.
In current technology, to the three-dimensional display of the changeable display of 2D/3D, the liquid crystal light valve of a controllable switch must be added at the rear portion of liquid crystal panel, when liquid crystal light valve is opened, realize 3D display, when liquid crystal light valve cuts out, realize 2D display, and then realize the switching of 2D/3D display; The existence of liquid crystal light valve, although the switching achieving 2D/3D; But in liquid crystal light valve opening, a big chunk light that light source can be made to provide cannot project on liquid crystal panel, cause falling sharply of brightness in 3 d mode, and then under same backlight illumination, brightness in 3 d mode can be made will to decay about 2/3rds compared with the brightness under 2D pattern, but the height of brightness has a great impact the effect that 3D shows.
In the prior art, increase to make brightness under 3D state, backlight, brightness is very high with regard to what arrange in 2 d mode in usual employing, although do the brightness requirement that ensure that under 3D state like this, but luminance difference is larger under also making 2D and 3D state, not only can bring discomfort to beholder, under also making 2D pattern, there is the technical matters of power wastage.
For addressing this problem, current method is, the reduced-current being applicable to 2D display and the dim signal used compared with big space rate is used when 2D shows, and the dim signal wanting high electric current and the less dutycycle of use compared with 2D display is switched to when 3D shows, requirement large to brightness when both ensure that 3D shows like this, is applicable to the low-light level of viewing and energy-conservation demand when in turn ensure that 2D shows.The method is all the input by adopting the mode of gauge tap pipe interpolation parallel resistance to adjust the control level of the driving chip of liquid crystal panel backlight at present, control driving chip by this control level and produce datum, thus realize changing backlight driver electric current.
As Fig. 1,2D/3D control level gauge tap pipe V1, make the ADMIN pin of LED drive chip when the state that V1 is in out or closes, produce different control levels due to the dividing potential drop of resistance R1, resistance R2 and resistance R3.When the PWMIN signal of input queued switches chip is high level, the switching tube V2 at the COMP pin place of driving chip is in closed condition, ISENSE pin detects the voltage of the ungrounded end of resistance R0, the output of pin DRI is controlled according to the magnitude of voltage detected, control level is different, and the output valve of corresponding DRI is just different, and the VOUT produced by voltage control module is just different, thus make LED group two ends have different pressure reduction, namely LED group has different electric currents; Meanwhile, the detection of ISENSE pin or a dynamic process, this process is also the process keeping current constant; When PWMIN signal is low level, the switching tube V2 at control COMP pin place opens, then no current in LED group.Thus, 2D/3D control level is relied on to carry out switching and the light modulation that driving chip completes backlight current.
But present inventor is in the process realizing invention technical scheme in application embodiment, and at least there are the following problems to find above-mentioned technology:
1, need backlight driver chip must have 2D/3D control level and receive pin, lamp group voltage control pin, steady current control pin etc., therefore there is the technical matters that the pin of needs is more;
2, simultaneously, need the peripheral circuit of steady current to coordinate driving chip to complete the constant function of back facet current, so just there is the technical matters high to the dynamic conditioning rate request of chip;
3, owing to departing from driving chip in prior art, the switching of electric current cannot be completed, so, there is the single and technical matters that dependence is strong of implementation.
Summary of the invention
The embodiment of the present application is by providing a kind of LCD backlight drive current control device and method, solve the single and technical matters that dependence is strong of the implementation existed in prior art, achieve and also can realize the switching of backlight drive electric current and the technique effect of constant function without backlight driver chip.
The embodiment of the present application provides a kind of LCD backlight drive current control device, comprising:
Control module, comprise the first control module and the second control module, the instruction that described first control module switches in order to receive display mode, and exporting corresponding control signal based on the instruction that described display mode switches, described second control module is in order to export control level based on described control signal;
Level conversion unit, is connected with described control module, for receiving the control level that described control module exports based on the control signal obtained; And based on described control level generating reference level;
Constant current unit, be connected with described level conversion unit, for receiving described datum, and the two kinds of electric currents at least comprising the first electric current and the second electric current are generated based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.
Further, described control module, comprising:
First control module, comprising: the first signal input pin and a PWMIN pin;
Second control module, comprising: the secondary signal input pin be connected with described first signal input pin, and the 2nd PWMIN pin be connected with a described PWMIN pin.
Further, described second control module comprises:
First energization pins;
First electronic switch, comprises first end, the second end and the 3rd end, and wherein, described second end is connected with described energization pins, and described first end is connected with inside first control signal of described control module;
Second electronic switch, comprises the 4th end, five terminal and the 6th end, wherein, described five terminal and described three-terminal link, described 4th end is connected with inside second control signal of described control module;
First grounding pin, with described six end connecting;
I/O pin, is connected on the line between described five terminal and described 3rd end.
Further, described level conversion unit specifically comprises:
Second energization pins;
First resistance, comprises the 7th end and the 8th end, and wherein, described 7th end is connected with described second energization pins;
Second resistance, comprises the 9th end and the tenth end, and wherein, described 9th end is connected with described 8th end;
3rd resistance, comprises the tenth one end and the 12 end, and wherein, described tenth one end is connected with described tenth end;
Second grounding pin, is connected with described 12 end;
Automatic level control pin, is connected on the line between described 8th end and described 9th end, and is connected with described I/O pin;
Datum pin, is connected on the line between described tenth end and described tenth one end.
Further, described constant current unit comprises:
Amplifier module, comprises the 13 end, the 14 end and the tenth five terminal, and wherein, described 13 end is connected with described datum pin;
Adjust flow module, be connected with described amplifier module.
Further, described tune flow module comprises:
First triode, comprises the 16 end, the 17 end and the 18 end, and wherein, described 18 end is connected with described 14 end;
4th resistance, comprises the 19 end and the 20 end, and wherein, described 19 end is connected with described 18 end with described 14 end respectively;
5th resistance, comprises the 20 one end and the 22 end, and wherein, described 20 one end is connected with described 16 end, and described 22 end is connected with described tenth five terminal;
3rd grounding pin, is connected with described 20 end.
Further, described device also comprises:
LED, is connected with described constant current unit, and after described first electric current received or the second electric current, described LED can be in luminance.
Additionally provide a kind of LCD backlight drive current control method in the embodiment of the present application, be applied to described backlight drive current control device, comprise:
Receive the instruction control signal that also generation is corresponding that display mode switches;
Control level is generated based on described control signal;
Based on described control level generating reference level;
Generate the two kinds of electric currents at least comprising the first electric current and the second electric current based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.
Further, when described control signal comprises the first control signal and the second control signal, described based on described control signal generation control level, be specially:
Based on described first control signal and described second control signal;
When the first electronic switch in described LCD backlight drive current control device be in closed condition, the second electronic switch be in open mode time, the I/O pin in described LCD backlight drive current control device exports the first control level;
When described first electronic switch be in open mode, the second electronic switch be in closed condition time, described I/O pin exports the second control level.
Further, when described first electronic switch and the second electronic switch are all in open mode, described I/O pin is in high-impedance state.
Further, described based on described control level generating reference level, be specially:
By the dividing potential drop of the first resistance of level conversion unit in described LCD backlight drive current control device, the second resistance and the 3rd resistance;
When described I/O pin exports described first control level, generate the first datum by described level conversion unit;
When described I/O pin is in high-impedance state, generate the second datum by described level conversion unit;
When described I/O pin exports described second control level, generate the first zero level by described level conversion unit.
Further, the described two kinds of electric currents at least comprising the first electric current and the second electric current based on described datum generation, are specially:
Described first datum is received by the amplifier module in constant current unit in described LCD backlight drive current control device;
The first reference current is generated by the 4th resistance in described constant current unit;
Described second datum is received by the amplifier module in constant current unit in described LCD backlight drive current control device;
The second reference current is generated by described 4th resistance.
The technical scheme that the application is provided by above embodiment, has following beneficial effect or advantage:
1, the control level owing to using control module to produce is carried out control level converting unit and is generated different datums, and produce different backlight currents by this datum control constant current unit, realize the switching of backlight current, compare pin number required for backlight driver chip in prior art, greatly reduce, and then reduce the requirement to driving chip.
2, also complete electric current from constant function because constant current unit produces reference current according to datum simultaneously, thus the cooperation can breaking away from backlight driver chip completes the function of current constant voluntarily, reduce the demand of chip and the requirement to driving chip dynamic conditioning speed.
3, owing to using the cooperation of control module, level conversion unit and constant current unit, so, under the prerequisite not relying on backlight driver chip, also can realize the switching of backlight current.
Accompanying drawing explanation
The module map of the LCD backlight drive current control circuit that Fig. 1 provides for prior art;
Fig. 2 is the module map of LCD backlight drive current control device in the embodiment of the present application;
Fig. 3 is the process flow diagram of LCD backlight drive current control method in the embodiment of the present application;
Fig. 4 is the circuit module pie graph of the embodiment of the present application one;
Fig. 5 is the circuit module pie graph of the embodiment of the present application two.
Embodiment
The embodiment of the present application is by the device that provides a kind of LCD backlight drive current and control and method, solve the single and technical matters that dependence is strong of the implementation existed in prior art, achieve and also can realize the switching of backlight drive electric current and the technique effect of constant function without backlight driver chip.
The technical scheme general thought of the embodiment of the present application is as follows:
By providing a kind of LCD backlight drive current control device, this device comprises:
Control module;
Level conversion unit, is connected with described control module, for receiving the control level that described control module exports based on the control signal obtained; And based on described control level generating reference level;
Constant current unit, be connected with described level conversion unit, for receiving described datum, and the two kinds of electric currents at least comprising the first electric current and the second electric current are generated based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.
As Fig. 2, level controling signal is produced by the control module being different from LCD backlight source drive chip, level controling signal control level converting unit produces different datums, and based on the different datum produced by the different steady current of constant current unit generation for driving backlight, thus achieve the switching of backlight current.
Below in conjunction with accompanying drawing, the device and method that a kind of LCD backlight drive current provided in the embodiment of the present application controls is described in detail.
Embodiment one
The embodiment of the present application provides the device that a kind of LCD backlight drive current controls, as shown in Figure 4, for using P-MOS pipe and N-MOS pipe as the first electronic switch and the second electronic switch, give a main circuit blocks pie graph of this device, specifically, the device that LCD backlight drive current in the embodiment of the present application controls, comprising:
Control module; Comprise the first control module CHIP0 and the second control module CHIP1; CHIP1 receives the display mode switching signal 2D/3D_In from CHIP0; Two electronic switches are at least comprised: P-MOS pipe M1 and N-MOS pipe M2 in CHIP1, wherein, the source electrode of M1 meets the supply voltage pin VCC of CHIP2 (without representing), grid meets the control signal N_Control1 of CHIP1 inside, drain electrode connects the source electrode of M2, the grid of M2 meets another control signal N_Control2 of CHIP1 inside, its grounded drain; The pin I/O_0 of an output signal is drawn in the junction of M1 and M2.In the present embodiment, CHIP0 can be the control chip such as main control chip or built-in FPGA of device, CHIP1 may also be the control chip such as main control chip or built-in FPGA of device, CHIP0 and CHIP1 can be same processing unit, also can be two independently processing units.
Level conversion unit, is connected with described control module, for the control level that reception control unit exports based on the control signal obtained, and based on described control level generating reference level.
Level conversion unit comprises resistance R1, resistance R2 and the resistance R3 of series connection, and wherein one end of R1 connects the voltage of pressure value identical with CHIP1 supply voltage, the other end ground connection of R3; The junction of R1 and R2 connects the output pin I/O_0 from control module, and the pin I/O_1 of an output signal is drawn in the junction of R2 and R3, and namely this signal is the datum produced.
Constant current unit, be connected with described level conversion unit, for receiving described datum, and the two kinds of electric currents at least comprising the first electric current and the second electric current are generated based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.
Wherein, described constant current unit comprises: amplifier N1 and the tune current circuit be made up of resistance R0, resistance R4 and triode V1; The in-phase end of amplifier N1 connects the output signal I/O_1 of level conversion unit, and end of oppisite phase is connected jointly with one end of resistance R0 and the emitter of triode V1, and output terminal is connected with one end of R4; The other end ground connection of R0, the other end of R4 is connected with the base stage of triode V1; The collector of V1 is connected with LED group.
In a particular application, the device course of work in the embodiment of the present application is as follows:
Suppose that current liquid crystal display shows with 2D state, when user sends by the command input device of external remote or device self instruction switching 3D display, namely trigger the first control module and send the control signal 2D/3D_Out switching display mode, this control signal is high level; After second control module receives the control signal of this switching display mode, judge that this is the instruction switching 3D display, then arrange that internal control signal N_Control1 is high level, internal control signal N_Control2 is low level, make M1 conducting, M2 by, in this case, I/O_0 is outputed signal because the conducting of M1 has the voltage VCC identical with M1 source electrode.
The control level that level conversion unit sends according to control module, namely outputs signal I/O_0, by the dividing potential drop of resistance R1, R2 and R3, makes the output control signal I/O_1 of level conversion unit export different datums.Specifically as shown in Figure 3, when I/O_0 exports high level VCC, I/O_1 exports 3D and switches datum, namely switches 3D and shows the level needed.
Because the in-phase end of the amplifier N1 of constant current unit is because be connected with I/O_1, so, there is the level identical with I/O_1, according to the characteristic of amplifier " empty short ", its end of oppisite phase and in-phase end have identical level, and the voltage that therefore resistance R0 holds can be determined, and then the emitter voltage of triode V1 also can be determined, and then the electric current flowing through R0 also can be determined, and then the collector current of V1 also can be determined, finally makes the 3D controlling LED group show electric current and is also determined.
In like manner, if current liquid crystal display shows with 3D state, when user sends by the command input device of external remote or device self instruction switching 2D display, namely trigger the first control module and send the control signal 2D/3D_Out switching display mode, this control signal is low level; After second control module receives the control signal of this switching display mode, judge that this is the instruction switching 2D display, then arranging internal control signal N_Control1 is that low level, internal control signal N_Control2 are also for low level, M1, M2 are all ended, in this case, output signal I/O_0 is because the cut-off of M1, M2 is in high-impedance state, then I/O_1 switches datum according to output 2D, namely switches the level that 2D display needs; Constant current unit generates the electric current switching 2D display and need according to this level, the 2D namely controlling LED group shows electric current.
From above-mentioned, user sends and switches steering order to the control module in the device in the embodiment of the present application, control module produces different control levels according to different instructions, different control levels generates different switching datums at level conversion unit, different switch currents is generated in constant current unit, thus achieve the switching of electric current, namely meet the switching of electric current when 2D/3D switches; And corresponding 3D display, due to the datum that datum show higher than 2D, so, the 3D switch current of generation also higher than 2D switch current, and then when achieving 3D display brightness large and 2D shows time brightness little requirement.
Under above-mentioned two states, if the electric current of LED group there occurs change, then according to the characteristic of triode, the electric current flowing through R0 also can change.Such as, when the electric current of LED group reduces, the electric current then flowing through R0 also reduces, and the voltage of R0 end reduces thereupon, causes the voltage of voltage lower than in-phase end of N1 end of oppisite phase, thus amplifier exports high level, the pressure reduction at R4 two ends is increased, then base current increases, and causes the emitter current of V1 to increase, R0 terminal voltage raises, and namely the end of oppisite phase voltage of amplifier raises close to in-phase end; When the electric current of LED group increases, the electric current then flowing through R0 also increases, the voltage of R0 end increases thereupon, cause the voltage of voltage higher than in-phase end of N1 end of oppisite phase, thus amplifier output low level, the pressure reduction at R4 two ends is reduced, then base current reduces, cause the emitter current of V1 to reduce, R0 terminal voltage reduces, and namely the end of oppisite phase voltage of amplifier reduces close to in-phase end.Thus, form closed loop, achieve the function of current constant.
The dividing potential drop of resistance R1, R2 and R3 from Fig. 4,3D switches datum and switches datum higher than 2D.This is a kind of mode of the present embodiment, and on the contrary, control 3D switches datum and is also fine lower than 2D switching datum, no longer repeats herein.
Further, at the device of the embodiment of the present application, while realizing current switching, backlight pulse bandwidth modulation signals PWM can also be added, while current switching, realizes the modulation of backlight.Specifically, be described below in conjunction with Fig. 5:
Control module CHIP0, sending current switching instruction level simultaneously, sends corresponding pwm signal; Such as, when user send from 2D be switched to 3D display instruction time, send accordingly be applicable to 3D display pwm signal, this signal reply 3D demand be the pwm signal that dutycycle is little; And when user send from 3D be switched to 2D display instruction time, send accordingly be applicable to 2D display pwm signal, this signal reply 2D demand be the pwm signal that dutycycle is larger.
No matter be which kind of pwm signal, its processing procedure is the same, namely control module CHIP1 is after receiving pwm signal, according to this signal, internal control is carried out to M1 and M2, namely when PWM is in high level, control module CHIP1 control N_Control1 is high level and N_Control12 is that low level makes the embodiment of the present application device generate 3D switch current, or control N_Control1 and N_Control12 is low level, the embodiment of the present application device is made to generate 2D switch current, and when PWM is in low level, control N_Control1 is low level and N_Control12 is high level, then I/O_0 is low level signal, the supply voltage of level conversion unit is made to be zero, the datum then exported is zero, amplifier N1 does not have control level, whole constant current unit does not work, thus make the electric current of LED group be zero.Thus, the light modulation of LED backlight group is achieved.
Technical scheme as can be seen from above-mentioned the embodiment of the present application: the backlight driving chip of the whole process disengaging LCDs of current switching and current constant completes, effectively reduce the dependence to driving chip, current constant is a dynamic process constantly adjusted, this process completes in driving chip outside, also reduces the requirement to driving chip dynamic conditioning speed.The work of PWM also can be taken out process from backlight driving chip, reduce further the requirement to driving chip, simultaneously due to the dynamic of light modulation, driving chip needs to possess higher dynamic conditioning speed, and PWM work is departed from driving chip realization by the embodiment of the present application, reduce the requirement that driving chip is regulated the speed.
Embodiment two
The embodiment of the present application provides a kind of method that LCD backlight drive current controls, and be applied to the LCD backlight drive current device in above-described embodiment, see Fig. 3, concrete steps comprise:
S01, reception control signal.
Specifically be: control module receives the control signal from complete machine main control unit, control signal can be in the embodiment of the present application: require to switch the signal of display mode, be specifically: indicate and 2D display switched to the signal that 3D display or 3D display switch to 2D display.Composition graphs 4, the first control module CHIP0 sends the signal 2D/3D_In switching display mode and is the control signal received.
S02, generates control level based on described control signal.
Specifically be: according to the control signal of the switching display mode received, generate corresponding control level, for different display modes, corresponding different control levels.Composition graphs 4, second control module CHIP1 receives the display mode switching signal 2D/3D_In from the first control module CHIP0, this signal pin is the control signal of two kinds of varying levels to 2D display and 3D display, second control module CHIP1, according to different 2D/3D_In, generates different control signal I/O_0.
S03, based on described control level generating reference level.Concrete, be described below in conjunction with Fig. 4:
Level conversion unit, according to different control signal I/O_0, produces different datum I/O_1 by the dividing potential drop of resistance; That is, when 2D display switches to 3D display, generate the level that 3D shows demand, this level is generally the multiple level that 2D display needs level, and when 3D display switches to 2D display, generates the level that 2D shows demand.
S04, generate the two kinds of electric currents at least comprising the first electric current and the second electric current based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.Namely in the embodiment of the present application, can generate be applicable to the electric current of corresponding display mode according to different datum I/O_1, this electric current is used for controlling the brightness of LCD backlight, and when 3D show, current value is large, and brightness is large, and during 2D display, electric current is little, brightness reduction.
The present embodiment method, when embody rule, can be applied in the device in embodiment one, and its concrete course of work is described in detail in embodiment one, in this just no longer repeated description.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
1, the control level owing to using control module to produce is carried out control level converting unit and is generated different datums, and produce different backlight currents by this datum control constant current unit, realize the switching of backlight current, compare pin number required for backlight driver chip in prior art, greatly reduce, and then reduce the requirement to driving chip;
2, also complete electric current from constant function because constant current unit produces reference current according to datum simultaneously, thus the cooperation can breaking away from backlight driver chip completes the function of current constant voluntarily, reduce the demand of chip and the requirement to driving chip dynamic conditioning speed.
3, owing to using the cooperation of control module, level conversion unit and constant current unit, so, under the prerequisite not relying on backlight driver chip, also can realize the switching of backlight current.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (12)
1. a LCD backlight drive current control device, is characterized in that, comprising:
Control module, comprise the first control module and the second control module, the instruction that described first control module switches in order to receive display mode, and exporting corresponding control signal based on the instruction that described display mode switches, described second control module is in order to export control level based on described control signal;
Level conversion unit, is connected with described control module, for receiving the control level that described control module exports based on the control signal obtained; And based on described control level generating reference level;
Constant current unit, be connected with described level conversion unit, for receiving described datum, and the two kinds of electric currents at least comprising the first electric current and the second electric current are generated based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.
2. device as claimed in claim 1, it is characterized in that, described control module, comprising:
First control module, comprising: the first signal output pin and a PWMIN pin;
Second control module, comprising: the secondary signal input pin be connected with described first signal output pin, and the 2nd PWMIN pin be connected with a described PWMIN pin.
3. device as claimed in claim 2, it is characterized in that, described second control module comprises:
First energization pins;
First electronic switch, comprises first end, the second end and the 3rd end, and wherein, described second end is connected with described energization pins, and described first end is connected with inside first control signal of described control module;
Second electronic switch, comprises the 4th end, five terminal and the 6th end, wherein, described five terminal and described three-terminal link, described 4th end is connected with inside second control signal of described control module;
First grounding pin, with described six end connecting;
I/O pin, is connected on the line between described five terminal and described 3rd end.
4. device as claimed in claim 3, it is characterized in that, described level conversion unit specifically comprises:
Second energization pins;
First resistance, comprises the 7th end and the 8th end, and wherein, described 7th end is connected with described second energization pins;
Second resistance, comprises the 9th end and the tenth end, and wherein, described 9th end is connected with described 8th end;
3rd resistance, comprises the tenth one end and the 12 end, and wherein, described tenth one end is connected with described tenth end;
Second grounding pin, is connected with described 12 end;
Automatic level control pin, is connected on the line between described 8th end and described 9th end, and is connected with described I/O pin;
Datum pin, is connected on the line between described tenth end and described tenth one end.
5. device as claimed in claim 4, it is characterized in that, described constant current unit comprises:
Amplifier module, comprises the 13 end, the 14 end and the tenth five terminal, and wherein, described 13 end is connected with described datum pin;
Adjust flow module, be connected with described amplifier module.
6. device as claimed in claim 5, it is characterized in that, described tune flow module comprises:
First triode, comprises the 16 end, the 17 end and the 18 end, and wherein, described 18 end is connected with described 14 end;
4th resistance, comprises the 19 end and the 20 end, and wherein, described 19 end is connected with described 18 end with described 14 end respectively;
5th resistance, comprises the 20 one end and the 22 end, and wherein, described 20 one end is connected with described 16 end, and described 22 end is connected with described tenth five terminal;
3rd grounding pin, is connected with described 20 end.
7. the device as described in claim arbitrary in claim 1-6, is characterized in that, described device also wraps
Draw together:
LED, is connected with described constant current unit, and after described first electric current received or the second electric current, described LED can be in luminance.
8. a LCD backlight drive current control method, is applied to LCD backlight drive current control device, it is characterized in that, said method comprising the steps of:
Receive the instruction control signal that also generation is corresponding that display mode switches;
Control level is generated based on described control signal;
Based on described control level generating reference level;
Generate the two kinds of electric currents at least comprising the first electric current and the second electric current based on described datum, wherein, the first current value of described first electric current is different current value from the second current value of described second electric current.
9. method as claimed in claim 8, is characterized in that, when described control signal comprises the first control signal and the second control signal, described based on described control signal generation control level, is specially:
Based on described first control signal and described second control signal;
When the first electronic switch in described LCD backlight drive current control device be in closed condition, the second electronic switch be in open mode time, the I/O pin in described LCD backlight drive current control device exports the first control level;
When described first electronic switch be in open mode, the second electronic switch be in closed condition time, described I/O pin exports the second control level.
10. method as claimed in claim 9, it is characterized in that, when described first electronic switch and the second electronic switch are all in open mode, described I/O pin is in high-impedance state.
11. methods as claimed in claim 10, is characterized in that, described based on described control level generating reference level, are specially:
By the dividing potential drop of the first resistance of level conversion unit in described LCD backlight drive current control device, the second resistance and the 3rd resistance;
When described I/O pin exports described first control level, generate the first datum by described level conversion unit;
When described I/O pin is in high-impedance state, generate the second datum by described level conversion unit;
When described I/O pin exports described second control level, generate the first zero level by described level conversion unit.
12. methods as claimed in claim 11, is characterized in that, the described two kinds of electric currents at least comprising the first electric current and the second electric current based on described datum generation, are specially:
Described first datum is received by the amplifier module in constant current unit in described LCD backlight drive current control device;
The first reference current is generated by the 4th resistance in described constant current unit;
Described second datum is received by the amplifier module in constant current unit in described LCD backlight drive current control device;
The second reference current is generated by described 4th resistance.
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| CN103165085B (en) * | 2013-03-29 | 2016-06-29 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit and driving method thereof and liquid-crystal apparatus |
| US8890423B2 (en) | 2013-03-29 | 2014-11-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving backlight driving circuit |
| CN103247279B (en) * | 2013-05-13 | 2015-07-01 | 深圳市华星光电技术有限公司 | Light source driving circuit of light emitting diode and backlight module |
| WO2017096567A1 (en) * | 2015-12-09 | 2017-06-15 | 华为技术有限公司 | Backlight circuit, electronic device and backlight adjustment method |
| CN105957475A (en) * | 2015-12-27 | 2016-09-21 | 天津市品通电力科技有限公司 | Display screen control circuit of electric power instrument |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co., Ltd Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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