CN110070836A - Drive circuit for backlight module group - Google Patents
Drive circuit for backlight module group Download PDFInfo
- Publication number
- CN110070836A CN110070836A CN201910318753.XA CN201910318753A CN110070836A CN 110070836 A CN110070836 A CN 110070836A CN 201910318753 A CN201910318753 A CN 201910318753A CN 110070836 A CN110070836 A CN 110070836A
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- circuit
- backlight module
- control chip
- module group
- drive circuit
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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)
Abstract
The invention discloses a kind of drive circuit for backlight module group, including controlling chip, control the first end connection backlight module anode of chip, control the second end ground connection of chip, the third end of control chip is separately connected backlight module cathode and voltage regulator circuit, voltage regulator circuit is made of several voltage regulation units in parallel, each voltage regulation unit include wire jumper and with the concatenated voltage regulating element of wire jumper, the voltage regulation capability of different voltages regulating element is different, when one of wire jumper is in the conductive state, other wire jumpers are in an off state, 4th end of control chip is separately connected first choice circuit and the second selection circuit, first choice circuit connection Input voltage terminal, second selection circuit accesses pwm signal, the 5th end for controlling chip connects the Input voltage terminal；The drive circuit for backlight module group, structure is simple, at low cost, and can not only realize fixed current output on a circuit but also realize variable-current.
Description
Technical field
The present invention relates to liquid crystal display device technical fields, more particularly to a kind of drive circuit for backlight module group.
Background technique
With the rapid development of electronic communication technology, the products such as electronic equipment, such as computer, television set are answered extensively
With these electronic equipments can all use liquid crystal display device.Liquid crystal itself does not have in the liquid crystal display panel of liquid crystal display device
The characteristics of luminescence, it is therefore desirable to cooperate planar light source device to provide light source to liquid crystal, backlight module is exactly current liquid crystal display device
In most common planar light source device.
Backlight module in process of production, is needed to be tested for the property it using drive circuit board, passes through driving circuit
Driving circuit in plate drives backlight module to shine, in the prior art, drive circuit for backlight module group there are circuit structure complexity,
Required element is more, and can not only realize fixed current output on a circuit but also realize variable-current, affects backlight
The testing efficiency and testing cost of mould group.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, it is an object of the invention to
It proposes the drive circuit for backlight module group that a kind of structure is simple, at low cost, fixed current output had not only been realized on a circuit but also real
Existing variable-current.
The first end of the drive circuit for backlight module group provided according to the present invention, including control chip, the control chip connects
Backlight module anode is connect, the third end of the second end ground connection of the control chip, the control chip is separately connected backlight module
Cathode and voltage regulator circuit, the voltage regulator circuit are made of several voltage regulation units in parallel, each electricity
Pressure adjust unit include wire jumper and with the concatenated voltage regulating element of the wire jumper, the voltage of the different voltage regulating elements
Regulating power is different, and when one of them described wire jumper is in the conductive state, other wire jumpers are in an off state, the control
4th end of coremaking piece is separately connected first choice circuit and the second selection circuit, the first choice circuit connection input voltage
End, second selection circuit access pwm signal, and the 5th end of the control chip connects the Input voltage terminal；
When first choice circuit conducting, second selection circuit is turned off, and the drive circuit for backlight module group is defeated
Constant current out；
When second selection circuit conducting, the first choice circuit shutdown, by changing accounting for for the pwm signal
The empty feedback voltage than to adjust the control chip, and then adjust the electric current of the drive circuit for backlight module group output.
Above-mentioned drive circuit for backlight module group, structure is simple, and electronic component used is less, and cost is lower, permanent when needing to export
When constant current, first choice circuit need to be only connected, the second selection circuit shutdown, at this point, certain in multiple voltage regulation units
A voltage regulation unit work, i.e., only one wire jumper is in the conductive state, and other wire jumpers are in an off state, therefore can be defeated
Constant current out, and by switching different wire jumper conductings, the electric current for exporting different steady state values may be implemented；Become when needing to export
When galvanic current, the second selection circuit need to be only connected, the shutdown of first choice circuit, the duty ratio by changing pwm signal can
The feedback voltage of control chip is adjusted, and then adjusts the size of output electric current, therefore, fixed electricity had both been realized on a circuit
Stream output realizes variable-current again.
In addition, above-mentioned drive circuit for backlight module group according to the present invention, can also have the following additional technical features:
Further, the first choice circuit uses first resistor, and second selection circuit uses second resistance, institute
It states first resistor and the second resistance is in parallel, the first end of the first resistor is connect with the 4th end of the control chip,
The second end of the first resistor connects the Input voltage terminal, and the of the first end of the second resistance and the control chip
The second end of the connection of four ends, the second resistance accesses the pwm signal.
Further, the first resistor is identical with the resistance value of the second resistance.
Further, the voltage regulating element is 3rd resistor, the 3rd resistor in the different voltage regulation units
Resistance value it is different, the first end of the wire jumper is connected with the corresponding 3rd resistor, and the second end of the wire jumper is grounded, described
3rd resistor is connect with the third end of the control chip and the backlight module cathode respectively.
Further, the control chip drives IC, the SW pin and the back of the control chip using TPS61169
The FB pin of the connection of optical mode group anode, the GND pin ground connection of the control chip, the control chip is separately connected the backlight
The CTRL pin of mould group cathode and the voltage regulator circuit, the control chip is separately connected the first choice circuit and institute
The second selection circuit is stated, the VIN pin of the control chip connects the Input voltage terminal.
Further, the drive circuit for backlight module group further includes input terminal voltage regulator circuit, the input terminal voltage regulator circuit
It is connected between the second end and backlight module anode of the control chip.
Further, the drive circuit for backlight module group further includes output end voltage regulator circuit, the output end voltage regulator circuit
First end be connected between the 5th end and the Input voltage terminal of the control chip, the of the output end voltage regulator circuit
Two ends ground connection.
Further, the drive circuit for backlight module group further includes accumulator, the first end of the accumulator and institute
The first end connection of control chip is stated, the second end of the accumulator is connect with the 5th end of the control chip.
Further, the drive circuit for backlight module group further includes rectification circuit, the first end of the rectification circuit and institute
The first end connection of control chip is stated, the second end of the rectification circuit is connect with the backlight module anode.
Further, the rectification circuit uses diode, the anode of the diode and the first of the control chip
End connection, the cathode of the diode are connect with the backlight module anode.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the logic diagram of drive circuit for backlight module group according to an embodiment of the invention；
Fig. 2 is the logic diagram of voltage regulation unit；
Fig. 3 is the electrical block diagram of drive circuit for backlight module group according to an embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Several embodiments of the invention are given in attached drawing.But the present invention can be to be permitted
Mostly different form is realized, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes
It is more thorough and comprehensive to the disclosure.
It should be noted that it can directly on the other element when element is referred to as " being fixedly arranged on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side ", "upper", "lower" and similar statement for illustrative purposes only, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.Term " and or " used herein include the arbitrary of one or more relevant listed items and
All combinations.
It please refers to Fig.1 to Fig.3, the drive circuit for backlight module group that one embodiment of the invention provides, including control chip 10, institute
State the first end connection backlight module anode 20 of control chip 10, the second end ground connection of the control chip 10, the control core
The third end of piece 10 is separately connected backlight module cathode 30 and voltage regulator circuit 40, and the voltage regulator circuit 40 is by several
Voltage regulation unit 41 in parallel forms, and each voltage regulation unit 41 includes wire jumper 411 and goes here and there with the wire jumper 411
The voltage regulation capability of the voltage regulating element 412 of connection, the different voltage regulating elements 412 is different, described in one of them
When wire jumper 411 is in the conductive state, other wire jumpers 411 are in an off state, that is, guarantee only one voltage regulation unit
41 is in running order.
4th end of the control chip 10 is separately connected first choice circuit 50 and the second selection circuit 60, and described first
Selection circuit 50 connects Input voltage terminal 70, and second selection circuit 60 accesses pwm signal, described to control the 5th of chip 10
End connects the Input voltage terminal 70.
Only one is in the conductive state for first choice circuit 50 and the second selection circuit 60.
When the first choice circuit 50 conducting, second selection circuit 60 is turned off, the backlight module driving electricity
Road exports constant current, and the constant current exported at this time is corresponding in running order voltage regulation unit 41.In addition, and leading to
It crosses and switches the different conductings of wire jumper 411, the electric current for exporting different steady state values may be implemented.
When second selection circuit 60 conducting, the first choice circuit 50 is turned off, by changing the pwm signal
Duty ratio to adjust the feedback voltage of the control chip 10, and then adjust the electricity of drive circuit for backlight module group output
Stream, and the range of current regulation is corresponding in running order voltage regulation unit 41.
Therefore the drive circuit for backlight module group had not only realized fixed current output on a circuit but also had realized variation electricity
Stream.And the circuit structure is simple, electronic component used is less, and cost is lower.
Specifically in the present embodiment, the control chip 10 drives IC, the SW of the control chip 10 using TPS61169
Pin is connect with the backlight module anode 20, the GND pin ground connection of the control chip 10, the FB pipe of the control chip 10
Foot is separately connected the backlight module cathode 30 and the voltage regulator circuit 40, the CTRL pin difference of the control chip 10
The first choice circuit 50 and second selection circuit 60 are connected, the VIN pin connection of the control chip 10 is described defeated
Enter voltage end 70.
It should be pointed out that in other embodiments of the invention, control chip 10 can also use other driving chips.
The first choice circuit 50 specifically uses first resistor R1, and the second selection circuit 60 uses second resistance R2, institute
State first resistor R1 and second resistance R2 parallel connection, the first end of the first resistor R1 and the 4th of the control chip 10
(i.e. CTRL pin) connection is held, the second end of the first resistor R1 connects the Input voltage terminal 70, the second resistance R2
First end connect with the 4th end (i.e. CTRL pin) of the control chip 10, the second end of second resistance R2 access institute
State pwm signal.
It specifically, the first resistor R1 is identical with the resistance value of the second resistance R2, such as is all 10R.
The voltage regulating element 412 is specially 3rd resistor, the 3rd resistor in the different voltage regulation units 41
Resistance value it is different, the first end of the wire jumper 411 is connected with the corresponding 3rd resistor, and the second of the wire jumper 411 terminates
Ground, the 3rd resistor connect with the third end (i.e. FB pin) of the control chip 10 and the backlight module cathode 30 respectively
It connects.
Specifically, the quantity of voltage regulation unit 41 4,4 voltage regulation units 41 are in parallel, therefore have 4 wire jumpers 411
With 4 3rd resistors, respectively wire jumper JUMP1, wire jumper JUMP2, wire jumper JUMP3, wire jumper JUMP4,3rd resistor R3a, third
Resistance R3b, 3rd resistor R3c, 3rd resistor R3d, wire jumper JUMP1 connect with 3rd resistor R3a, wire jumper JUMP2 and third electricity
R3b series connection is hindered, wire jumper JUMP3 connects with 3rd resistor R3c, and wire jumper JUMP4 connects with 3rd resistor R3d, 3rd resistor R3a,
3rd resistor R3b, 3rd resistor R3c, the resistance value of 3rd resistor R3d are different, for realizing different voltages regulating element 412
Voltage regulation capability it is different.
Specifically in the present embodiment, the resistance value of 3rd resistor R3a is 10R, the jump where it in voltage regulation unit 41
When line JUMP1 is in the conductive state, the electric current of 20MA can be exported.
The resistance value of 3rd resistor R3b is 5R, and the wire jumper JUMP2 where it in voltage regulation unit 41 is in the conductive state
When, the electric current of 40MA can be exported.
The resistance value of 3rd resistor R3c is 2.5R, and the wire jumper JUMP3 where it in voltage regulation unit 41 is on shape
When state, the electric current of 80MA can be exported.
The resistance value of 3rd resistor R3d is 1R, and the wire jumper JUMP4 where it in voltage regulation unit 41 is in the conductive state
When, the electric current of 200MA can be exported.
Therefore, when the first choice circuit 50 is connected, second selection circuit 60 is turned off, different by switching
Wire jumper 411 is connected, and the electric current for exporting different steady state values may be implemented.Also output can be adjusted by replacing the resistance value of R3a-R3d
Electric current.
In addition, when second selection circuit 60 conducting, the first choice circuit 50 is turned off, described in changing
The duty ratio of pwm signal is to adjust the feedback voltage for controlling chip 10, and then it is defeated to adjust the drive circuit for backlight module group
Electric current out, and the range of current regulation is corresponding in running order voltage regulation unit 41.For example, at wire jumper JUMP2
In on state, then output electric current can be controlled by pwm signal and is changed between 0-40MA.If wire jumper JUMP14 is on
State can then control output electric current by pwm signal and change between 0-200MA, therefore analogize.
It should be pointed out that in other embodiments of the invention, the quantity and 3rd resistor of voltage regulation unit 41
Resistance value can be set according to the actual situation, the present invention and with no restrictions.
Please continue to refer to Fig. 3, in the present embodiment, the drive circuit for backlight module group can also include input terminal voltage regulator circuit
80, the input terminal voltage regulator circuit 80 is connected between the second end and the backlight module anode 20 of the control chip 10,
For realizing the pressure stabilizing of input terminal, specifically, input terminal voltage regulator circuit 80 can use capacitor C1.
The drive circuit for backlight module group can also include output end voltage regulator circuit 90, the output end voltage regulator circuit 90
First end is connected between the 5th end and the Input voltage terminal 90 of the control chip 10, the output end voltage regulator circuit 90
Second end ground connection, for realizing the pressure stabilizing of output end, specifically, output end voltage regulator circuit 90 can use capacitor C2.
The drive circuit for backlight module group can also include accumulator 100, the first end of the accumulator 100 and institute
The first end connection of control chip 10 is stated, the second end of the accumulator 100 is connect with the 5th end of the control chip 10,
For realizing the effect of energy storage, specifically, accumulator 100 can use inductance L1.
The drive circuit for backlight module group can also include rectification circuit 110, the first end of the rectification circuit 110 and institute
The first end connection of control chip 10 is stated, the second end of the rectification circuit 110 connect with the backlight module anode 20, is used for
Realize rectification effect, specifically, the rectification circuit 100 can use diode D1, the diode D1 anode with it is described
The first end connection of chip 10 is controlled, the cathode of the diode D2 is connect with the backlight module anode 20.
To sum up, according to drive circuit for backlight module group provided in this embodiment, structure is simple, and electronic component used is less, at
This is lower, and when needing to export constant current, only first choice circuit need to be connected, the second selection circuit shutdown, at this point, multiple
Some voltage regulation unit work in voltage regulation unit, i.e., only one wire jumper is in the conductive state, and other wire jumpers are in
Off-state, therefore constant current can be exported, and by switching different wire jumper conductings, it may be implemented to export different steady state values
Electric current；When needing to export variable-current, the second selection circuit need to be only connected, the shutdown of first choice circuit passes through change
The duty ratio of pwm signal can adjust the feedback voltage of control chip, and then adjust the size of output electric current, therefore, at one
Not only fixed current output had been realized on circuit but also realized variable-current.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of drive circuit for backlight module group, which is characterized in that including controlling chip, the first end of the control chip connects back
The third end of optical mode group anode, the second end ground connection of the control chip, the control chip is separately connected backlight module cathode
And voltage regulator circuit, the voltage regulator circuit are made of several voltage regulation units in parallel, each voltage tune
Section unit include wire jumper and with the concatenated voltage regulating element of the wire jumper, the voltage of the different voltage regulating elements adjusts
Ability is different, and when one of them described wire jumper is in the conductive state, other wire jumpers are in an off state, the control core
4th end of piece is separately connected first choice circuit and the second selection circuit, the first choice circuit connection Input voltage terminal,
Second selection circuit accesses pwm signal, and the 5th end of the control chip connects the Input voltage terminal；
When first choice circuit conducting, the second selection circuit shutdown, the drive circuit for backlight module group output perseverance
Constant current；
When second selection circuit conducting, the first choice circuit shutdown, by the duty ratio for changing the pwm signal
To adjust the feedback voltage of the control chip, and then adjust the electric current of the drive circuit for backlight module group output.
2. drive circuit for backlight module group according to claim 1, which is characterized in that the first choice circuit uses first
Resistance, second selection circuit use second resistance, and the first resistor and the second resistance are in parallel, the first resistor
First end connect with the 4th end of the control chip, the second end of the first resistor connection Input voltage terminal, institute
The first end for stating second resistance is connect with the 4th end of the control chip, and the second end of the second resistance accesses the PWM
Signal.
3. drive circuit for backlight module group according to claim 2, which is characterized in that the first resistor and second electricity
The resistance value of resistance is identical.
4. drive circuit for backlight module group according to claim 1, which is characterized in that the voltage regulating element is third electricity
The resistance value of resistance, the 3rd resistor in the different voltage regulation units is different, the first end of the wire jumper and corresponding described the
The connection of three resistance, the second end ground connection of the wire jumper, the 3rd resistor respectively with the control third end of chip and described
The connection of backlight module cathode.
5. drive circuit for backlight module group according to claim 1, which is characterized in that the control chip uses TPS61169
IC is driven, the SW pin of the control chip is connect with the backlight module anode, the GND pin ground connection of the control chip,
The FB pin of the control chip is separately connected the backlight module cathode and the voltage regulator circuit, the control chip
CTRL pin is separately connected the first choice circuit and second selection circuit, the VIN pin connection of the control chip
The Input voltage terminal.
6. drive circuit for backlight module group according to claim 1, which is characterized in that the drive circuit for backlight module group also wraps
Input terminal voltage regulator circuit is included, the input terminal voltage regulator circuit is being connected to the second end for controlling chip and the backlight module just
Between pole.
7. drive circuit for backlight module group according to claim 1, which is characterized in that the drive circuit for backlight module group also wraps
Include output end voltage regulator circuit, the first end of the output end voltage regulator circuit is connected to the 5th end of the control chip and described defeated
Enter between voltage end, the second end ground connection of the output end voltage regulator circuit.
8. drive circuit for backlight module group according to claim 1, which is characterized in that the drive circuit for backlight module group also wraps
Accumulator is included, the first end of the accumulator is connect with the first end of the control chip, and the second of the accumulator
It holds and is connect with the 5th end of the control chip.
9. drive circuit for backlight module group according to claim 1, which is characterized in that the drive circuit for backlight module group also wraps
Rectification circuit is included, the first end of the rectification circuit is connect with the first end of the control chip, and the second of the rectification circuit
End is connect with the backlight module anode.
10. drive circuit for backlight module group according to claim 9, which is characterized in that the rectification circuit uses diode,
The anode of the diode is connect with the first end of the control chip, the cathode of the diode and backlight module anode
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910318753.XA CN110070836B (en) | 2019-04-19 | 2019-04-19 | Backlight module driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910318753.XA CN110070836B (en) | 2019-04-19 | 2019-04-19 | Backlight module driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110070836A true CN110070836A (en) | 2019-07-30 |
| CN110070836B CN110070836B (en) | 2021-01-26 |
Family
ID=67368126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910318753.XA Active CN110070836B (en) | 2019-04-19 | 2019-04-19 | Backlight module driving circuit |
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| Country | Link |
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| CN (1) | CN110070836B (en) |
Cited By (1)
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| CN113539150A (en) * | 2021-06-09 | 2021-10-22 | 重庆两江联创电子有限公司 | Backlight brightness control circuit and liquid crystal display screen detection equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110070836B (en) | 2021-01-26 |
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