CN106097986A - A kind of backlight drive circuit - Google Patents
A kind of backlight drive circuit Download PDFInfo
- Publication number
- CN106097986A CN106097986A CN201610709720.4A CN201610709720A CN106097986A CN 106097986 A CN106097986 A CN 106097986A CN 201610709720 A CN201610709720 A CN 201610709720A CN 106097986 A CN106097986 A CN 106097986A
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- Prior art keywords
- drive circuit
- switch element
- backlight drive
- input
- resistance
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention provides a kind of backlight drive circuit, and described backlight drive circuit includes: input block, boost module, output module, the first detector unit and current adjustment unit；Described input block, described boost module and described output module are sequentially connected with, and described output module is connected with the first end of load, and described boost module, described first detector unit, described current adjustment unit are commonly connected to the second end of described load；Described current adjustment unit, for adjusting the electric current inputting described load according to the second external control signal.The backlight drive circuit of the present invention, reduces production cost.
Description
[technical field]
The present invention relates to Display Technique field, particularly relate to a kind of backlight drive circuit.
[background technology]
Along with the development of Display Technique, the backlight technology of liquid crystal display also develops constantly.Existing display mould
Formula includes that two and three dimensions shows pattern, generally under three-dimensional display mode, needs the voltage that backlight drive circuit input is bigger,
Therefore backlight drive circuit needs the driving voltage different according to display pattern offer.
But, the backlight drive circuit of existing display device needs multiple chips to provide, and such as provides and enables the micro-of signal
Control unit (MCU, Microcontroller Unit), and input voltage is boosted to required voltage when 3D shows pattern
Boost chip, and the chip of the size of current of detection inflow light emitting diode, owing to existing backlight drive circuit needs to set
Put multiple chip, therefore increase production cost.
Therefore, it is necessary to provide a kind of backlight drive circuit, to solve the problem existing for prior art.
[summary of the invention]
It is an object of the invention to provide a kind of backlight drive circuit, to solve the life of the backlight drive circuit of prior art
Produce relatively costly technical problem.
For solving above-mentioned technical problem, the present invention provides a kind of backlight drive circuit, comprising:
Input block, boost module, output module, the first detector unit and current adjustment unit；Described input block,
Described boost module and described output module are sequentially connected with, and described output module is connected with the first end of load, described boosting
Module, described first detector unit, described current adjustment unit are commonly connected to the second end of described load；
Described boost module, for generating the first control signal, and increases described input according to described first control signal
The voltage of unit input, obtains driving voltage；So that described driving voltage is corresponding with display pattern；Wherein said display pattern bag
Include two dimensional mode and three-dimensional display mode；
Described first detector unit, for detecting electric current input described load, and according to described electric current adjustment described the
The dutycycle of one control signal, so that the electric current inputting described load remains constant；
Described current adjustment unit, for adjusting the electric current inputting described load according to the second external control signal.
In the backlight drive circuit of the present invention, described current adjustment unit includes the first resistance and the first switch element,
One end of described first resistance is connected with the second end of described load, the other end of described first resistance and described first switch unit
The input of part connects, and the control end of described first switch element is connected with described second control signal, described first switch unit
The output head grounding of part.
In the backlight drive circuit of the present invention, described boost module includes that boosting unit, described boosting unit include control
Device processed, inductance and second switch element；
Described controller has the first outfan, the first test side；Described first outfan is used for exporting described first control
Signal processed；Common node between described first test side with described first resistance and described load is connected；
One end of described inductance is connected with described input module, the other end of described inductance and described second switch element
Input connects, and the control end of described second switch element is connected with described first outfan, described second switch element defeated
Go out to hold ground connection.
In the backlight drive circuit of the present invention, described boost module also includes the second detector unit, described second detection
Unit, for detecting the size of described driving voltage, when described driving voltage is more than preset value, controls described boosting unit and stops
Only work.
In the backlight drive circuit of the present invention, described controller also has the second test side, described second detector unit
Including the 3rd resistance, one end of described 3rd resistance is examined with the outfan of described second switch element and described second respectively
Survey end connects, the other end ground connection of described 3rd resistance.
In the backlight drive circuit of the present invention, described first detector unit includes the second resistance, described second resistance
One end is connected with described first test side, the other end ground connection of described second resistance.
In the backlight drive circuit of the present invention, described output module includes rectification unit, the input of described rectification unit
End is connected with the input of described second switch element, and the outfan of described rectification unit connects described load.
In the backlight drive circuit of the present invention, described output module also includes filter capacitor, the one of described filter capacitor
End is connected with the outfan of described rectification unit, the other end ground connection of described filter capacitor.
In the backlight drive circuit of the present invention, described backlight drive circuit also includes the 3rd switch element, the described 3rd
The input of switch element is connected with the second end of described load, and the end that controls of described 3rd switch element is controlled with the external the 3rd
Signal processed connects, and the outfan of described 3rd switch element is connected with described common node.
In the backlight drive circuit of the present invention, described input block includes total input and storage electric capacity, described storage
One end of electric capacity is connected with described total input, the other end ground connection of described storage electric capacity.
The backlight drive circuit of the present invention, owing to redesigning existing backlight drive circuit, simplifies existing
Circuit, thus decrease the quantity of chip, reduce production cost.
[accompanying drawing explanation]
Fig. 1 is the structural representation of existing backlight drive circuit；
Fig. 2 is the structural representation of the backlight drive circuit of the present invention.
[detailed description of the invention]
The explanation of following embodiment is particular implementation that is graphic with reference to add, that implement in order to illustrate the present invention may be used to
Example.The direction term that the present invention is previously mentioned, such as " on ", D score, "front", "rear", "left", "right", " interior ", " outward ", " side "
Deng, it is only the direction with reference to annexed drawings.Therefore, the direction term of use is to illustrate and understand the present invention, and is not used to
Limit the present invention.In the drawings, the unit that structure is similar is to represent with identical label.
Refer to the structural representation that Fig. 1, Fig. 1 are existing backlight drive circuit.
Existing backlight drive circuit include boost chip 100 (such as BOOST IC), micro-control unit 101 (MCU),
Controller 102 (LED controler)；This backlight drive circuit has total input 11, at the beginning of this total input 11 is used for inputting
Beginning voltage；This backlight drive circuit also includes storing electric capacity C1 and filter capacitor C2, and commutator D1.
Wherein micro-control unit 101 includes the first outfan 15 and the second outfan 16, this first outfan 15 for
Boost chip 100 provides and enables signal, works triggering boost chip 100；This second outfan 16, for showing mould by correspondence
The data transmission such as electric current required under formula and dutycycle are to controller 102, and controller 102 is further according to the data genaration electricity of input
Pressure control signal.Controller 102 has the 3rd outfan 14 and the first test side 18, and this first test side 18 is used for detecting input
Voltage on the voltage of light emitting diode, namely resistance R2, the 3rd outfan 14 is used for transmitting this voltage control signal.
Boost chip 100 has the 4th outfan 12 and the second test side 13, and the 4th outfan 12 is used for exporting boosting
Control signal, voltage control signal is for adjusting the dutycycle of voltage up control signal；This second test side 13 is used for detecting process
Voltage on voltage swing after boosting, namely resistance R1.
When specific works, micro-control unit 101 triggers boost chip 100 and works, and boost chip 100 is according to control afterwards
The voltage control signal that device 102 provides controls switch and the Guan Bi of the first field-effect transistor Q1, to control the charge and discharge of inductance L
The electricity time, thus improve the size of initial voltage.This outer controller 102 also detects the size of current of input light emitting diode,
When electric current is more than preset value, voltage control signal is carried out feedback control, so that input current keeps constant.Boost chip
100 voltage swings that also detection inductance L1 exports, when voltage is more than preset value, controls the first field-effect transistor Q1 and disconnect,
No longer promote initial voltage.
When display pattern is 3D flash pattern, controller, by the control signal of the 5th input 17 output, controls the
The opening and closing of two field-effect transistor Q2, and then make LED flash.
Refer to the structural representation of the backlight drive circuit that Fig. 2, Fig. 2 are the present invention.
The backlight drive circuit of the present invention, as in figure 2 it is shown, include: input block 201, boost module 202, output module
203, the first detector unit 204 and current adjustment unit 205；Described input block 201, described boost module 202 and institute
Stating output module 203 to be sequentially connected with, described output module 203 is connected with first end (such as positive pole) of load 30, and this load is
The light emitting diode of at least two series connection, described boost module 202, described first detector unit 204, described electric current adjust single
Unit 205 is commonly connected to second end (such as negative pole) of described load 30；Described input block 201 is used for providing voltage source.
Described boost module 202 is used for generating the first control signal (namely input Q1 controls voltage of end), and according to institute
State the first control signal and increase the voltage of described input block 201 input, obtain driving voltage (namely voltage of inductance output)；
So that described driving voltage is corresponding with display pattern；Wherein said display pattern includes two dimensional mode and three dimensional display mould
Formula；
Described first detector unit 204, for detecting the electric current inputting described load 30, and adjusts institute according to described electric current
State the dutycycle of the first control signal, so that the electric current inputting described load remains constant；Specifically, the first detector unit 204
By the voltage on detection resistance R2, obtain exporting the electric current of described load, and calculated electric current is entered with predetermined threshold value
Row compares, if being not equal to predetermined threshold value, is then adjusted the dutycycle of the first control signal, by adjusting the first control letter
Number dutycycle, namely the voltage of input load is carried out feedback control, so that the electric current inputting described load 30 keeps
Constant.
Described current adjustment unit 205, for adjusting the electricity inputting described load according to the second external control signal P2
Stream.Described current adjusting module 205, may be used for adjusting, according to the second external control signal, the electricity being connected with described load 30
The resistance of resistance, to adjust the electric current inputting described load.Described second control signal P2 is such as square-wave signal, this second control
Signal P2 is such as according to display schema creation.When in two dimensional mode, the second control signal P2 is low level, when in three-dimensional
During display pattern, the second control signal P2 is high level.
Described current adjustment unit 205 includes the first resistance R3 and the first switch element Q3, the one of described first resistance R3
End is connected with second end (negative pole) of described load 30, and the other end of described first resistance R3 is with described first switch element Q3's
Input connects, and the control end of described first switch element Q3 is connected with described second control signal P2, described first switch unit
The output head grounding of part Q3.This first switch element Q3 is such as field-effect transistor.
Described boost module 202 includes boosting unit, and it includes controller 20, inductance L1 and second switch element Q1,
This second switch element Q1 is such as field-effect transistor.
Described controller 20 has first outfan the 21, first test side 22；Described first outfan 21 is used for exporting institute
State the first control signal；Common node N between described first test side 22 and described first resistance R3 and described load 30 is even
Connect；
One end of described inductance L1 is connected with described input module 201, and the other end of described inductance L1 is opened with described second
The input closing element Q1 connects, and the control end of described second switch element Q1 is connected with described first outfan 21, and described the
The output head grounding of two switch element Q1.
Described boost module 202 also includes that the second detector unit 24, described second detector unit 24 are driven described in being used for detecting
The size of galvanic electricity pressure, when described driving voltage is more than preset value, controls described boosting unit and quits work.Specifically, control
Device 20 also detects the voltage swing of inductance L1 output, when output voltage size is more than preset value so that boosting unit stops work
Make, namely Q1 is disconnected.
Described controller 20 also has the second test side 23, and described second detector unit 24 includes the 3rd resistance R1, described
One end of 3rd resistance R1 is connected with the outfan of described second switch element Q1 and described second test side 23 respectively, institute
State the other end ground connection of the 3rd resistance R1.
Described first detector unit 204 includes the second resistance R2, one end of described second resistance R2 and described first detection
End 22 connection, the other end ground connection of described second resistance R2.It is understood that one end of the second resistance R2 the most respectively with resistance
One end of R3, the outfan of Q2 connect.
Described output module 203 includes rectification unit D1, the input of described rectification unit D1 and described second switch unit
The input of part Q1 connects, and the outfan of described rectification unit D1 connects described load 30.
Described output module 203 also includes filter capacitor C2, one end of described filter capacitor C2 and described rectification unit 203
Outfan connect, the other end ground connection of described filter capacitor C2.
Described backlight drive circuit also includes the 3rd switch element Q2, and the input of described 3rd switch element Q2 is with described
Second end of load 30 connects, and the end that controls of described 3rd switch element Q2 is connected with the 3rd external control signal P3, described
The outfan of the 3rd switch element Q2 is connected with described common node N.Namely the 3rd control signal P3 be square-wave signal, work as display
When pattern is three-dimensional flash pattern, controlled the closed and disconnected of the 3rd switch element Q2 by the 3rd control signal P3.When the 3rd
During switch element Q2 Guan Bi, lumination of light emitting diode.When the 3rd switch element Q2 disconnects, light emitting diode is the most luminous, namely
Achieve flicker.
Described input block 201 includes total input 25 and storage electric capacity C1, and one end of described storage electric capacity C1 is with described
Total input 25 connects, the other end ground connection of described storage electric capacity C1.
Specifically, owing to when three-dimensional display mode, needing to input bigger electric current to load.Therefore at three dimensional display mould
During formula, control Q3 by outer signal and close, so that R3 with R2 is in parallel, thus reduce the electricity being connected with light emitting diode
The resistance of resistance, and then increase the current value of input light emitting diode.Due to the drive circuit after improving, it is not necessary to arrange
More chip, thus decrease the quantity of chip, therefore reduce production cost.
The backlight drive circuit of the present invention, owing to redesigning existing backlight drive circuit, simplifies existing
Circuit, thus decrease the quantity of chip, reduce production cost.
In sum, although the present invention is disclosed above with preferred embodiment, but above preferred embodiment and be not used to limit
The present invention processed, those of ordinary skill in the art, without departing from the spirit and scope of the present invention, all can make various change and profit
Decorations, therefore protection scope of the present invention defines in the range of standard with claim.
Claims (10)
1. a backlight drive circuit, it is characterised in that including: input block, boost module, output module, the first detection list
Unit and current adjustment unit；Described input block, described boost module and described output module are sequentially connected with, described output
Module is connected with the first end of load, and described boost module, described first detector unit, described current adjustment unit connect jointly
The second end in described load；
Described boost module, for generating the first control signal, and increases described input block according to described first control signal
The voltage of input, obtains driving voltage；So that described driving voltage is corresponding with display pattern；Wherein said display pattern includes two
Dimension display pattern and three-dimensional display mode；
Described first detector unit, for detecting the electric current inputting described load, and adjusts described first control according to described electric current
The dutycycle of signal processed, so that the electric current inputting described load remains constant；
Described current adjustment unit, for adjusting the electric current inputting described load according to the second external control signal.
Backlight drive circuit the most according to claim 1, it is characterised in that described current adjustment unit includes the first resistance
With the first switch element, one end of described first resistance is connected with the second end of described load, the other end of described first resistance
Being connected with the input of described first switch element, the control end of described first switch element is with described second control signal even
Connect, the output head grounding of described first switch element.
Backlight drive circuit the most according to claim 2, it is characterised in that described boost module includes boosting unit, institute
State boosting unit and include controller, inductance and second switch element；
Described controller has the first outfan, the first test side；Described first outfan is used for exporting described first and controls letter
Number；Common node between described first test side with described first resistance and described load is connected；
One end of described inductance is connected with described input module, the other end of described inductance and the input of described second switch element
End connects, and the control end of described second switch element is connected with described first outfan, the outfan of described second switch element
Ground connection.
Backlight drive circuit the most according to claim 3, it is characterised in that
Described boost module also includes the second detector unit, and described second detector unit is for detecting the big of described driving voltage
Little, when described driving voltage is more than preset value, controls described boosting unit and quit work.
Backlight drive circuit the most according to claim 4, it is characterised in that
Described controller also has the second test side, and described second detector unit includes the 3rd resistance, the one of described 3rd resistance
End is connected with the outfan of described second switch element and described second test side respectively, the other end of described 3rd resistance
Ground connection.
Backlight drive circuit the most according to claim 3, it is characterised in that
Described first detector unit includes the second resistance, and one end of described second resistance is connected with described first test side, described
The other end ground connection of the second resistance.
Backlight drive circuit the most according to claim 3, it is characterised in that
Described output module includes that rectification unit, the input of described rectification unit connect with the input of described second switch element
Connecing, the outfan of described rectification unit connects described load.
Backlight drive circuit the most according to claim 7, it is characterised in that described output module also includes filter capacitor,
One end of described filter capacitor is connected with the outfan of described rectification unit, the other end ground connection of described filter capacitor.
Backlight drive circuit the most according to claim 3, it is characterised in that
Described backlight drive circuit also includes the 3rd switch element, the of the input of described 3rd switch element and described load
Two ends connect, and the end that controls of described 3rd switch element is connected with the 3rd external control signal, described 3rd switch element
Outfan is connected with described common node.
Backlight drive circuit the most according to claim 3, it is characterised in that described input block include total input and
Storage electric capacity, one end of described storage electric capacity is connected with described total input, the other end ground connection of described storage electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610709720.4A CN106097986A (en) | 2016-08-23 | 2016-08-23 | A kind of backlight drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610709720.4A CN106097986A (en) | 2016-08-23 | 2016-08-23 | A kind of backlight drive circuit |
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| CN106097986A true CN106097986A (en) | 2016-11-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610709720.4A Pending CN106097986A (en) | 2016-08-23 | 2016-08-23 | A kind of backlight drive circuit |
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Cited By (8)
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| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Control circuit of remote controller with backlight screen |
| CN106602537A (en) * | 2017-02-28 | 2017-04-26 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| CN106782346A (en) * | 2016-12-29 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of backlight module circuit and liquid crystal display |
| CN107016967A (en) * | 2017-06-09 | 2017-08-04 | 河源中光电通讯技术有限公司 | Backlight drive circuit |
| WO2018133136A1 (en) * | 2017-01-19 | 2018-07-26 | 深圳市华星光电技术有限公司 | Backlight control circuit and electronic device |
| CN110390913A (en) * | 2019-06-26 | 2019-10-29 | 昆山龙腾光电有限公司 | Driving circuit, back light system and display device |
| CN110831274A (en) * | 2018-08-07 | 2020-02-21 | 欧姆龙株式会社 | Power supply device |
| US11057974B2 (en) | 2017-12-05 | 2021-07-06 | Omron Corporation | Power supply device |
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| CN106354075A (en) * | 2016-11-25 | 2017-01-25 | 北京意同创科技有限公司 | Control circuit of remote controller with backlight screen |
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Application publication date: 20161109 |
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