CN110096089A - Driving circuit and display device - Google Patents
Driving circuit and display device Download PDFInfo
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- CN110096089A CN110096089A CN201910346418.0A CN201910346418A CN110096089A CN 110096089 A CN110096089 A CN 110096089A CN 201910346418 A CN201910346418 A CN 201910346418A CN 110096089 A CN110096089 A CN 110096089A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
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Abstract
The embodiment of the present application provides a kind of driving circuit and display device, is related to field of circuit technology.Wherein, driving circuit includes reference voltage input unit, the first current lens unit and constant current output unit, which includes the first branch and second branch.Reference voltage input unit is used to constitute negative feedback loop with the first branch to generate reference current, and the first current lens unit according to default image ratio for handling reference current to obtain image current；Constant current output unit is used to generate constant current signal to load according to image current.The application can be realized the convenient adjusting to the image ratio of the first current lens unit.
Description
Technical field
This application involves field of circuit technology, in particular to a kind of driving circuit and display device.
Background technique
Currently, LED (Light Emitting Diode, light emitting diode) display device generally uses driving circuit to realize
Display driving, but in order to be adapted to different applications, the output current scope of driving circuit is usually required according to different application
Different model employed in occasion or different types of display device are adaptively adjusted, but existing driving circuit can not
It is adaptively adjusted for different display devices.
Summary of the invention
In response to the above problems, the embodiment of the present application provides a kind of driving circuit and display device, specific as follows.
On the one hand, the embodiment of the present application provides a kind of driving circuit, including reference voltage input unit, the first current mirror list
Member and constant current output unit, first current lens unit includes the first branch and second branch；
The first input end of the reference voltage input unit is used for external reference power supply；
The first input end of the first branch and the first input end of the second branch are respectively used to and the base
The output end of quasi- voltage input unit is connected to obtain branch operating voltage；
Second input terminal of the first branch is used for external first control signal, the second input terminal of the second branch
For external second control signal, the first branch and the second branch are used for according to the first control signal and described
The adjusting of second control signal realization image ratio；The output end of the first branch is used for and the reference voltage input unit
The connection of second input terminal；
The first input end of the constant current output unit for connect with the output end of the second branch, the second input terminal
It is used to connect with load for external first working voltage source, output end；
Wherein, the reference voltage input unit is used to constitute negative feedback loop with the first branch to generate benchmark electricity
Stream, first current lens unit is for handling the reference current according to default image ratio to obtain image current, institute
Constant current output unit is stated for generating according to the image current for driving the constant current signal of the load to the load.
In the selection of the embodiment of the present application, the first branch includes the first sub switch and multiple first switch units；
The first input end of first sub switch for connect with the output end of the reference voltage input unit, second
Input terminal is used to connect with the second input terminal of the reference voltage input unit for external second working voltage source, output end
It connects；
The first input end of each first switch unit for connect with the output end of the reference voltage input unit,
Second input terminal is for external second working voltage source, third input terminal for external first control signal in first control
Off state, the output end that itself is adjusted under the control of signal are used to connect with the second input terminal of the reference voltage input unit
It connects.
In the selection of the embodiment of the present application, each first switch unit includes that the second sub switch and third are opened
It closes；
The first input end of second sub switch for connect with the output end of the reference voltage input unit, second
Input terminal is used to connect with second working voltage source, output end is used to connect with the first input end of the third sub switch
It connects；
Second input terminal of the third sub switch is for external first control signal in the control of the first control signal
Off state, the output end that itself is adjusted under system are used to connect with the second input terminal of the reference voltage input unit.
In the selection of the embodiment of the present application, first sub switch and each second sub switch are PMOS
(Positive channel Metal Oxide Semiconductor, p-type Metal-oxide-semicondutor) pipe, the PMOS tube
Grid as the first input end of first sub switch and second sub switch, drain electrode be used as first sub switch
And output of the second input terminal, source electrode of second sub switch as first sub switch and second sub switch
End.
In the selection of the embodiment of the present application, the quantity of the first switch unit is 2M-1, M > 0, and first control
Signal is realized using thermometer-code.
In the selection of the embodiment of the present application, the second branch includes the 4th sub switch and multiple second switch units；
The first input end of 4th sub switch for connect with the output end of the reference voltage input unit, second
Input terminal is for external second working voltage source, output end for connecting with the first input end of the constant current output unit；
The first input end of each second switch unit is respectively used to the output end with the reference voltage input unit
Connection, the second input terminal are respectively used to connect with second working voltage source, third input terminal is respectively used to external second and controls
Signal processed with adjusted under the control of the second control signal itself off state, output end be respectively used to it is defeated with the constant current
The first input end connection of unit out.
In the selection of the embodiment of the present application, the quantity of the second switch unit is 2N- 1, N > 0, and second control
Signal processed is realized using binary code value.
In the selection of the embodiment of the present application, the image ratio of first current lens unit isWherein, M is the quantity of the first switch unit in the first branch, and N is the in second branch
The quantity of two switch units, DR [j] are first control signal, and DI [i] is second control signal, and i, j are whole more than or equal to 0
Number.
In the selection of the embodiment of the present application, the reference voltage input unit includes first error amplifier and in-built electrical
Resistance；
The first input end of the first error amplifier for connect with the reference power supply, the second input terminal for
The output end connection of the first branch, output end are used for first input end and the second branch with the first branch
First input end be separately connected；
One end of the built-in resistor is connect with the output end of the first branch, the other end is grounded.
In the selection of the embodiment of the present application, the constant current output unit includes the second error amplifier and the second current mirror
Unit；
The first input end of second error amplifier with the output end of the second branch for connecting, second inputs
It holds for being connect with first working voltage source, output end is used to connect with the first input end of second current lens unit
It connects；
Second input terminal of second current lens unit with the output end of the second branch for connecting, output end is used
It is connected in the load.
In the selection of the embodiment of the present application, second current lens unit includes the first MOS device and the 2nd MOS device
Part；
The grid of first MOS device for connect with the output end of second error amplifier, drain for
The output end connection of the second branch, source electrode ground connection；
The grid of second MOS device for connect with the output end of second error amplifier, drain for
The load connection, source electrode ground connection.
On the other hand, the embodiment of the present application also provides a kind of display device, including above-mentioned driving circuit.
In the above-mentioned driving circuit and display device that the embodiment of the present application provides, by being set to the ingenious of circuit structure
Meter can realize the convenient tune to the image ratio of first current lens unit by first control signal and second control signal
Section, so that the driving circuit can be used in the display driving of different types of display device.In addition, the application implement in the
One current lens unit is constituted using multiple unit current sources, so that current mismatch is permanent in different applications for driving circuit
It is fixed, it is unrelated with output electric current.
To enable the above objects, features, and advantages of the application to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the frame structure schematic diagram of driving circuit provided by the embodiments of the present application.
Fig. 2 is the electricity of the negative feedback loop of reference voltage input unit shown in Fig. 1 and the first current lens unit composition
Line structure schematic diagram.
Fig. 3 is the electrical block diagram of the first current lens unit shown in Fig. 1.
Fig. 4 is the electrical block diagram of constant current output unit shown in Fig. 1.
Fig. 5 is the electrical block diagram of driving circuit provided by the embodiments of the present application.
Fig. 6 is the device architecture schematic diagram for constituting the MOS device of first current lens unit.
Icon: 10- driving circuit；11- reference voltage input unit；110- first error amplifier；111- built-in resistor；
The first current lens unit of 12-；The 120- first branch；The first sub switch of 1200-；1201- first switch unit；The second son of 1202-
Switch；1203- third sub switch；121- second branch；The 4th sub switch of 1210-；1211- second switch unit；13- constant current is defeated
Unit out；The second error amplifier of 130-；The second current lens unit of 131-；The first MOS device of 1310-；The 2nd MOS device of 1311-
Part.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment only
It is a part of the embodiment of the application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings
The component of embodiment can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments herein provided in the accompanying drawings is not intended to limit below claimed
Scope of the present application, but be merely representative of the selected embodiment of the application.Based on the embodiment in the application, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model of the application protection
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.In the description of the present application
In, " first, second, third, fourth etc. is only used for distinguishing description term, and should not be understood as only or imply relative importance.
In the description of the present application unless specifically defined or limited otherwise, term " setting ", " connected ", " connection " are answered
It is interpreted broadly, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The connection in portion.For the ordinary skill in the art, the tool of above-mentioned term in this application can be understood with concrete condition
Body meaning.
As shown in Figure 1, driving circuit 10 provided by the embodiments of the present application may include the 11, first electricity of reference voltage input unit
Mirror unit 12 and constant current output unit 13 are flowed, first current lens unit 12 includes the first branch 120 and second branch 121.
Wherein, the reference voltage input unit 11 and the first branch 120 composition negative feedback loop are described to generate reference current
The first current lens unit 12 that the first branch 120 and the second branch 121 are constituted is according to default image ratio to the benchmark electricity
Stream is handled to obtain image current, and the constant current output unit 13 is generated according to the image current for driving the load
Constant current signal.
Specifically, referring to Fig. 1, the first input end of the reference voltage input unit 11 is for external benchmark electricity
Source is to obtain reference voltage Vref；The first input end of the first branch 120 and the first input of the second branch 121
End is respectively used to connect with the output end of the reference voltage input unit 11 to obtain branch operating voltage；The first branch
120 the second input terminal is used for external first control signal, and the second input terminal of the second branch 121 is for external second control
Signal processed, the first branch 120 and the second branch 121 are used for according to the first control signal and second control
The adjusting of signal realization image ratio；The output end of the first branch 120 is used for the with the reference voltage input unit 11
The connection of two input terminals；The first input end of the constant current output unit 13 for connect with the output end of the second branch 121,
Second input terminal is used to connect with load for external first working voltage source, output end.
In the aforementioned driving circuit 10 that the embodiment of the present application provides, control word (such as first control signal, second can be passed through
Control signal) form to the image ratio of first current lens unit 12 carry out quickly, easily adjustment, to increase the driving
The range of the output electric current of circuit 10, and driven for the display of different types of display device.
In detail, the reference voltage input unit 11 is used to obtain the benchmark electricity in 10 course of work of driving circuit
Pressure.As shown in Fig. 2, in one embodiment, the reference voltage input unit 11 may include 110 He of first error amplifier
Built-in resistor 111.Wherein, the first input end of the first error amplifier 110 for connect with the reference power supply, second
Input terminal is used to connect with the output end of the first branch 120, output end is used for the first input with the first branch 120
The first input end of end and the second branch 121 is separately connected；One end of the built-in resistor 111 and the first branch
120 output end connects, the other end is grounded.Optionally, the reference power supply can be but be not limited to the band gap base of chip interior
Size, the model etc. of quasi- source, the first error amplifier 110 and the built-in resistor 111 can carry out according to actual needs
It chooses, the embodiment of the present application is herein with no restrictions.
In addition, as shown in Fig. 2, the first branch 120 may include the first sub switch 1200 and multiple first switch units
1201；The first input end of first sub switch 1200 for connect with the output end of the reference voltage input unit 11,
Second input terminal is used for the second input with the reference voltage input unit 11 for external second working voltage source, output end
End connection；The first input end of each first switch unit 1201 is respectively used to defeated with the reference voltage input unit 11
Outlet connection, the second input terminal are respectively used to external second working voltage source, third input terminal is respectively used to external first control
Signal is to adjust each switch-off state in itself under the control of the first control signal to realize to the first current mirror
The adjusting of the image ratio of unit 12, output end are respectively used to connect with the second input terminal of the reference voltage input unit 11.
In actual implementation, since the reference voltage input unit 11 provided in the application can be with described first
Road 120 constitutes the negative feedback loop for generating reference current, then the reference voltage Vref that the reference power supply provides can be through
The negative feedback loop being made of the first error amplifier 110, the first branch 120 and built-in resistor 111 shown in Fig. 2
Reference current I0, and I0=Vref/Rext are generated after processing, wherein Vref represents reference voltage, and Rext is built-in resistor 111
Resistance value, it is noted that in the driving circuit that the embodiment of the present application provides, the resistance value size of built-in resistor 111 determines base
The size of quasi- electric current I0.
In addition, the driving circuit 10 provided in the embodiment of the present application it can be seen from negative feedback loop shown in Fig. 2 exists
When generating reference current, no setting is required, and additional external resistance carries out the adjusting of reference current, but passes through first control signal
Adjusting of the on-off quantity realization of first switch unit 1201 to reference current is controlled, is effectively reduced in driving circuit 10
The quantity of PIN, while can also reduce the circuit design cost and circuit power consumption of the driving circuit 10.
As an implementation, referring to Fig. 2, each first switch unit 1201 may each comprise the second son
Switch 1202 and third sub switch 1203 for controlling 1202 on off operating mode of the second sub switch.Wherein, second son
The first input end of switch 1202 for connect with the output end of the reference voltage input unit 11, the second input terminal for
The second working voltage source connection, output end with the first input end of the third sub switch 1203 for connecting；Described
Second input terminal of three sub switchs 1203 is for external first control signal to adjust certainly under the control of the first control signal
Off state, the output end of body are used to connect with the second input terminal of the reference voltage input unit 11.
Optionally, first sub switch 1200 and each second sub switch 1202 can be but be not limited to PMOS
Pipe, the grid of the PMOS tube is as the first input end of first sub switch 1200 and second sub switch 1202, leakage
Pole is as the second input terminal of first sub switch 1200 and second sub switch 1202, source electrode as first son
The output end of switch 1200 and second sub switch 1202.In addition, the quantity of the first switch unit 1201 can be
2M-1, M > 0, and thermometer-code realization, j >=0 can be used in the first control signal DR [j].In addition, the third sub switch
1203 can also be used but be not limited to metal-oxide-semiconductor or other kinds of transistor etc..
Further, in the embodiment of the present application, the first branch 120 is removed and 11 structure of reference voltage input unit
Except negative feedback loop as shown in Figure 2, it is also used to constitute the first electric current as shown in Figure 3 with the second branch 121
Mirror unit 12, and first current lens unit 12 can obtain accurate matched image current based on the reference current.
Wherein, referring to Fig. 3, the second branch 121 may include the 4th sub switch 1210 and multiple second switches
Unit 1211；The first input end of 4th sub switch 1210 is used to connect with the output end of the reference voltage input unit 11
It connects, the second input terminal is used to input with the first of the constant current output unit 13 for external second working voltage source, output end
End connection；The first input end of each second switch unit 1211 is respectively used to defeated with the reference voltage input unit 11
Outlet connection, the second input terminal are respectively used to connect with second working voltage source, third input terminal is respectively used to external the
Two control signals are respectively used to and the perseverance with adjusting itself off state, output end under the control of the second control signal
Flow the first input end connection of output unit 13.
It should be noted that, the second branch that in the embodiment of the present application provides similar with the first branch 120
Each of 121 second switch units 1211 are similar with the circuit structure of the first switch unit 1201, e.g., Mei Gesuo
Stating second switch unit 1211 may also comprise the second sub switch 1202 and third sub switch 1203.When actual implementation, described second
The first input end of the second sub switch 1202 in branch 121 is used to connect with the output end of the reference voltage input unit 11
It connects, the second input terminal is used to connect with second working voltage source, output end is for the with the third sub switch 1203
The connection of one input terminal；Second input terminal of the third sub switch 1203 is for external second control signal in first control
Off state, the output end that itself is adjusted under the control of signal are used to connect with the first input end of the constant current output unit 13
It connects.
Optionally, the third sub switch 1203 in the second switch unit 1211 and the 4th sub switch 1210 are also possible to
But it is not limited to PMOS tube.In addition, the quantity of the second switch unit 1211 is 2N- 1, N > 0, and the second control signal can
Using but be not limited to binary code value realize.
Based on the first above-mentioned current lens unit 12, it is assumed that first sub switch 1200, the second sub switch 1202 are adopted
With PMOS device, then when multiple PMOS devices bias voltage having the same, the output electric current and device of each PMOS device
Size is directly proportional, and multiple PMOS devices that identical size therefore, in the embodiment of the present application can be used constitute as described above first
Current lens unit 12, and the image ratio of first current lens unit 12 is then determined by the quantity of PMOS device in the conductive state
It is fixed, so can be adjusted by first control signal and second control signal the quantity of PMOS device in the first current lens unit 12 with
Default image ratio required for obtaining.
Further, according to actual needs, in the first current lens unit 12 provided in above-mentioned Fig. 3, described first
Road 120 and the second branch 121 are made of unit current source (such as PMOS device), and the first branch 120 and described
Each PMOS device grid source having the same in two branches 121, drain-source bias voltage, that is, the output of the first current lens unit 12
Image current and the ratio between the reference current of negative feedback loop output be equal to the PMOS device that connected state is in the first branch 120
The ratio of PMOS device number in the conductive state in the number of part and the second branch 121, that is to say, that the first electricity
The ratio between reference current of the image current that mirror unit 12 exports and negative feedback loop output is flowed by first control signal DR and second
The corresponding code value of two groups of control signals (control word) of signal DI is controlled to determine.
Such as, when the quantity of the first switch unit 1201 is 2M-1, the quantity of M > 0, the second switch unit 1211 is
2N- 1, N > 0, the corresponding code value of the first control signal are DR [j], and the corresponding code value of the second control signal is DI [i]
When, the image ratio of first current lens unit 12 isThat is the first current lens unit 12 output
Image current be with the ratio between the reference current that negative feedback loop exports
It should be noted that the corresponding code value of the first control signal is that DR [j] and second control signal are corresponding
Code value is that DI [i] can realize that details are not described herein for the present embodiment by way of writing register.
Further, when carrying out the design of the driving circuit 10, in order to accurately control in the driving circuit 10
Gate source voltage, drain-source voltage in first current lens unit 12, and comprehensively consider the driving capability and circuit power consumption of current mirror
Current mirror structure twice can be used in the driving circuit 10 provided in the embodiment of the present application in balance, is once above-mentioned first
Current lens unit 12, another time can be by increasing current mirror structure in the constant current output unit 13.
Specifically, as an implementation, as shown in figure 4, the constant current output unit 13 may include that the second error is put
Big device 130 and the second current lens unit 131；The first input end of second error amplifier 130 is used for and described second
Road 121 output end connection, the second input terminal for connect with first working voltage source (VCRES), output end for
The first input end of second current lens unit 131 connects；Second input terminal of second current lens unit 131 be used for
The output end connection of the second branch 121, output end are used to connect with the load.
According to actual needs, second current lens unit 131 may include the first MOS device 1310 and the second MOS device
1311；The grid of first MOS device 1310 is used to connect with the output end of second error amplifier 130, drain use
In connect with the output end of the second branch 121, source electrode ground connection；The grid of second MOS device 1311 be used for it is described
The output end connection of second error amplifier 130 drains for being grounded with load connection, source electrode.
In actual implementation, it is assumed that first MOS device 1310 and second MOS device 1311 can be respectively by more
The identical but in varying numbers NMOS tube of a size is constituted, and each NMOS tube constitutes current-mirror structure under identical bias voltage,
The output electric current Iout (constant current signal) of the so described driving circuit 10 can beWherein, K is the mirror image of second current lens unit 131
Than.
Driving circuit 10 based on foregoing description, as shown in fig. 5, it is assumed that the first son in first current lens unit 12
Switch 1200, second sub switch 1202 are PMOS device, the first MOS device in second current lens unit 131
1310 the NMOS tube identical but in varying numbers by multiple sizes can be constituted respectively with second MOS device 1311, and second
The image ratio of current lens unit 131 is K, then, below to the electric current in 10 course of work of driving circuit provided in the application
The constant principle of mismatch is illustrated.
Firstly, current mismatch in the first current lens unit 12 provided in the application is mainly by constituting the unit of the circuit
Current source decision, such as PMOS device, then, when each PMOS device for constituting first current lens unit 12 is in depth saturation region
When, the current mismatch in first current lens unit 12 mostlys come from the threshold voltage δ of PMOS deviceVthMismatch.
Secondly, Fig. 6 is please referred to, the equivalent mismatch current δ of MOS deviceIWith drain terminal electric current IdsThe ratio between are as follows:
Wherein, W is the width of the conducting channel in PMOS device, and L is the length of the conducting channel in PMOS device, δVthTo lose
The variation of threshold voltage with introducing,κ is scale factor, depending on the making technology of PMOS device, then
It can be obtained according to PMOS device modelTherefore, and PMOS device constant in output signal
L value it is constant under the premise of, the equivalent mismatch current δ of PMOS deviceIWith source-drain current IdsThe ratio between it is unrelated with device W value.
Therefore, in practical applications, although the driving circuit 10 needs to be adapted to various application occasions, so that the perseverance of output
The current range of stream signal Iout usually requires to change between 0.5mA~20mA, but due to first in the application above-mentioned
The matching current of current lens unit 12 is determined by minimum current unit, then constituting the first branch with the increase of current range
The quantity of PMOS device in 120 halves, the current doubles of current unit,Halve, while the mismatch of threshold voltage vt h adds
Times, last equivalent mismatch current is constant, i.e., the current mismatch for being contributed under different current ranges by the first current lens unit 12
It is constant.
Further, the embodiment of the present application also provides a kind of display device, which includes above-mentioned driving circuit
10, wherein due to the display device have with the same or similar technical characteristic of the driving circuit 10, accordingly, with respect to institute
The detailed description for stating display device can refer to the aforementioned description to the driving circuit 10, and the embodiment of the present application is no longer superfluous herein
It states.Further it will be understood that the display device can be but not limited to LED display.
In conclusion in the above-mentioned driving circuit 10 and display device that the embodiment of the present application provides, by circuit knot
The ingehious design of structure can realize the mirror to first current lens unit 12 by first control signal and second control signal
As than convenient adjusting so that the driving circuit 10 can be used in different types of display device display driving.In addition, this
The first current lens unit 12 in application implementation is constituted using multiple unit current sources, so that driving circuit 10 is in different applications
Current mismatch is constant in occasion.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (12)
1. a kind of driving circuit, which is characterized in that including reference voltage input unit, the first current lens unit and constant current output list
Member, first current lens unit includes the first branch and second branch；
The first input end of the reference voltage input unit is used for external reference power supply；
The first input end of the first branch and the first input end of the second branch are respectively used to and the benchmark electricity
The output end of input unit is pressed to connect to obtain branch operating voltage；
Second input terminal of the first branch is used for external first control signal, and the second input terminal of the second branch is used for
External second control signal, the first branch and the second branch are used for according to the first control signal and described second
Control the adjusting that signal realizes image ratio；The output end of the first branch is for second with the reference voltage input unit
Input terminal connection；
The first input end of the constant current output unit is used to connect with the output end of the second branch, the second input terminal is used for
External first working voltage source, output end are used to connect with load；
Wherein, the reference voltage input unit is used to constitute negative feedback loop with the first branch to generate reference current,
First current lens unit is for handling the reference current according to default image ratio to obtain image current, the perseverance
Stream output unit is used to generate the constant current signal for driving the load according to the image current.
2. driving circuit according to claim 1, which is characterized in that the first branch includes the first sub switch and multiple
First switch unit；
The first input end of first sub switch with the output end of the reference voltage input unit for connecting, second inputs
End is for external second working voltage source, output end for connecting with the second input terminal of the reference voltage input unit；
The first input end of each first switch unit for connect with the output end of the reference voltage input unit, second
Input terminal is for external second working voltage source, third input terminal for external first control signal in the first control signal
Control under adjust itself off state, output end is with the second input terminal of the reference voltage input unit for connecting.
3. driving circuit according to claim 2, which is characterized in that each first switch unit includes that the second son is opened
It closes and third sub switch；
The first input end of second sub switch with the output end of the reference voltage input unit for connecting, second inputs
End with second working voltage source for connecting, output end is used to connect with the first input end of the third sub switch；
Second input terminal of the third sub switch is for external first control signal under the control of the first control signal
Off state, the output end for adjusting itself are used to connect with the second input terminal of the reference voltage input unit.
4. driving circuit according to claim 3, which is characterized in that first sub switch and each second son are opened
Closing is PMOS tube, and the grid of the PMOS tube is as the first input end of first sub switch and second sub switch, leakage
Pole as the second input terminal of first sub switch and second sub switch, source electrode as first sub switch and
The output end of second sub switch.
5. driving circuit according to claim 2, which is characterized in that the quantity of the first switch unit is 2M-1, M > 0,
And the first control signal is realized using thermometer-code.
6. driving circuit according to claim 2, which is characterized in that the second branch includes the 4th sub switch and multiple
Second switch unit；
The first input end of 4th sub switch with the output end of the reference voltage input unit for connecting, second inputs
End is for external second working voltage source, output end for connecting with the first input end of the constant current output unit；
The first input end of each second switch unit is respectively used to connect with the output end of the reference voltage input unit,
Second input terminal is respectively used to connect with second working voltage source, third input terminal is respectively used to external second control signal
It is respectively used to and the constant current output unit with adjusting itself off state, output end under the control of the second control signal
First input end connection.
7. driving circuit according to claim 6, which is characterized in that the quantity of the second switch unit is 2N- 1, N > 0,
And the second control signal is realized using binary code value.
8. driving circuit according to claim 6, which is characterized in that the image ratio of first current lens unit isWherein, M is the quantity of the first switch unit in the first branch, and N is the in second branch
The quantity of two switch units, DR [j] are first control signal, and DI [i] is second control signal, and i, j are whole more than or equal to 0
Number.
9. driving circuit according to claim 1, which is characterized in that the reference voltage input unit includes first error
Amplifier and built-in resistor；
The first input end of the first error amplifier for connect with the reference power supply, the second input terminal for it is described
The output end connection of the first branch, output end are used for the with the first input end of the first branch and the second branch
One input terminal is separately connected；
One end of the built-in resistor is connect with the output end of the first branch, the other end is grounded.
10. driving circuit according to claim 1, which is characterized in that the constant current output unit includes that the second error is put
Big device and the second current lens unit；
The first input end of second error amplifier with the output end of the second branch for connecting, the second input terminal is used
In connect with first working voltage source, output end is used to connect with the first input end of second current lens unit；
Second input terminal of second current lens unit for connect with the output end of the second branch, output end for
The load connection.
11. driving circuit according to claim 10, which is characterized in that second current lens unit includes the first MOS
Device and the second MOS device；
The grid of first MOS device for connect with the output end of second error amplifier, drain for it is described
The output end connection of second branch, source electrode ground connection；
The grid of second MOS device for connect with the output end of second error amplifier, drain for it is described
Load connection, source electrode ground connection.
12. a kind of display device, which is characterized in that including driving circuit described in any one of the claims 1-11.
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