CN205751480U - A kind of display device and power driving circuit thereof - Google Patents
A kind of display device and power driving circuit thereof Download PDFInfo
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- CN205751480U CN205751480U CN201620474853.3U CN201620474853U CN205751480U CN 205751480 U CN205751480 U CN 205751480U CN 201620474853 U CN201620474853 U CN 201620474853U CN 205751480 U CN205751480 U CN 205751480U
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Abstract
This utility model belongs to display and drives control field, it is provided that a kind of display device and power driving circuit thereof.This utility model includes the power driving circuit of power module and drive control module by employing, a constant voltage DC electricity is exported to drive control module by power module, and by drive control module, described constant voltage DC electricity is boosted and blood pressure lowering process, respectively obtain backlit operation voltage and display running voltage, for backlight lamp bar, mainboard and display unit are powered, and then achieve power module and only need to export the purpose that the load of multiple different operating voltages just can be powered by a road constant voltage DC electricity, when overcoming that power module uses multiple-channel output present in prior art, the meeting intermodulation to power supply, the problem that efficiency etc. produce impact, simultaneously, simplify circuit structure, save pcb board space, reduce cost.
Description
Technical field
This utility model belongs to display and drives control field, particularly relates to a kind of display device and power drives thereof
Circuit.
Background technology
At present, the drive circuit of liquid crystal display or inside liquid crystal television is all by power module and constant-current driving
Module composition, power module exports a 12V voltage by Transformer Winding, and constant-current driven module is by 12V
Boost in voltage to backlit operation voltage is that backlight lamp bar is powered, and provides driving electric current for backlight lamp bar.Meanwhile,
In order to power to the mainboard of display interior and display unit, drive circuit also needs to export the electricity of a 5V
Pressure, current way is to increase by a road output in power module, as it is shown in figure 1, by power module
Transformer Winding output one 5V voltage, directly power for mainboard and display unit, so, power supply
Module just has two-way to export, i.e. one tunnel output 12V voltage, another road output 5V voltage.
It is known that multiple-channel output is to have very to intermodulation, efficiency, overcurrent protection and the overvoltage protection etc. of power supply
Big impact, if power supply loop or transformator slightly design improper, the normal work of complete machine can be directly affected
Make, and in power module, increase by a road output so that circuit structure is more complicated, causes pcb board
Area increases, and cost increases.
Utility model content
The purpose of this utility model is to provide a kind of display device and power driving circuit thereof, it is intended to solve existing
When having that in technology, the power module of the drive circuit of display interior has multiple-channel output, the intermodulation of power supply can be affected
With efficiency etc., and causing circuit structure complicated, the area of pcb board increases, the problem that cost increases.
This utility model is achieved in that a kind of display drive circuit, the of described power driving circuit
One voltage output end and current output terminal meet the backlight lamp bar in the display unit of described display device, institute simultaneously
The second voltage output end stating power driving circuit connects mainboard and the display unit of described display device simultaneously；Institute
State power driving circuit and include power module, described power module output constant voltage DC electricity, it is characterised in that
Described power driving circuit also includes drive control module, the input of described drive control module and described electricity
The outfan of source module connects, the first outfan of described drive control module, the second outfan and the 3rd
Outfan is respectively the first voltage output end of described power driving circuit, current output terminal and the second voltage
Outfan；
Described drive control module by described constant voltage DC electricity boost in voltage to backlit operation voltage and to described
Backlight lamp bar carries out constant current-supplying driving, and meanwhile, described drive control module is by the electricity of described constant voltage DC electricity
Pressure drop is depressed into display running voltage, and powers for described mainboard and described display unit.
This utility model additionally provides a kind of display device, and shown display device includes that power supply described above drives
Galvanic electricity road.
This utility model includes the power driving circuit of power module and drive control module by employing, by electricity
It is to drive control module and straight to described constant voltage by drive control module that source module exports a constant voltage DC electricity
Stream electricity carries out boosting and blood pressure lowering processes, and respectively obtains backlit operation voltage and display running voltage, for backlight
Bar, mainboard and display unit are powered, and then achieve power module and only need to export a road constant voltage DC electricity just
The purpose can being powered the load of multiple different operating voltages, overcomes power supply present in prior art
When module uses multiple-channel output, the problem that the intermodulation of power supply, efficiency etc. can be produced impact, simplify meanwhile
Circuit structure, saves pcb board space, reduces cost.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the drive circuit of the display interior that prior art provides；
Fig. 2 is the modular structure schematic diagram of the power driving circuit that this utility model embodiment provides；
Fig. 3 is the electrical block diagram of the power driving circuit that this utility model embodiment provides.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, this utility model is further elaborated.Should be appreciated that described herein specifically
Embodiment, only in order to explain this utility model, is not used to limit this utility model.
This utility model embodiment provides the power driving circuit of a kind of display device.
Fig. 2 shows the modular structure of the power driving circuit that this utility model embodiment provides, for the ease of
Illustrate, illustrate only the part relevant to this utility model embodiment.
As in figure 2 it is shown, the first voltage output end of power driving circuit and current output terminal connect display dress simultaneously
Backlight lamp bar in the display unit put, the second voltage output end of power driving circuit connects display device simultaneously
Mainboard and display unit.
Power driving circuit includes that power module 1, power module 1 export constant voltage DC electricity.Power drives electricity
Road also includes that drive control module 2, the input of drive control module 2 connect with the outfan of power module 1
Connecing, the first outfan of drive control module 2, the second outfan and the 3rd outfan are respectively described electricity
First voltage output end of source driving circuit, current output terminal and the second voltage output end.
Drive control module 2 by described constant voltage DC electricity boost in voltage to backlit operation voltage and to the described back of the body
Light modulation bar carries out constant current-supplying driving, and meanwhile, drive control module 2 is by the voltage drop of described constant voltage DC electricity
It is depressed into display running voltage, and powers for mainboard and display unit.
As an embodiment of the present utility model, the value of the constant voltage DC electricity of power module 1 output is 12V,
Backlit operation voltage is 12V-24V, and display running voltage is 5V, and drive control module 2 can be to power module
The constant voltage DC electricity of 1 output carries out boosting and blood pressure lowering processes, and respectively obtains backlit operation voltage and display work
Voltage, powers for backlight lamp bar, mainboard and display unit.
As an embodiment of the present utility model, drive control module 2 includes:
Drive control module 2 includes boosting unit 21, control unit 22 and pressure unit 23.
The input of boosting unit 21 connects as drive control module 2 altogether with the input of control unit 22
Input, the outfan of boosting unit 21 is the first outfan of drive control module 2, control unit 22
Control termination boosting unit 21 switch terminals, the electric current adjustable side of control unit 22 is drive control module
Second outfan of 2, the input of the output termination pressure unit 23 of control unit 22, pressure unit 23
The 3rd outfan that outfan is drive control module 2.
Control unit 22 controls boosting unit 21
Backlight lamp bar is powered, and meanwhile, control unit 22 exports a driving electric current and drives backlight lamp bar；Control unit
22 with pressure unit 23 jointly by the voltage step-down of constant voltage DC electricity to display running voltages and be mainboard and show
Show that unit is powered.
In the present embodiment, control unit 22 has control boosting unit work simultaneously, provides for backlight lamp bar
Drive electric current and work in coordination with the function carrying out blood pressure lowering with pressure unit.
Fig. 3 shows the circuit structure of the power driving circuit that this utility model embodiment provides, for the ease of
Illustrate, illustrate only the part relevant to this utility model embodiment.
As an embodiment of the present utility model, control unit 22 includes: constant-current decompression driving chip U2,
Resistance R7, resistance R8, diode D6, resistance R9 and resistance R10.
The input that supply pin VIN is control unit 22 of constant-current decompression driving chip U2, constant-current decompression drives
The brightness adjustment control foot PWM of dynamic chip U2 connects external dimmer pwm signal, constant-current decompression by resistance R7
Input pin BS and on and off switch output pin SW is common for the feed back input foot FB1 of driving chip U2, driving
As the outfan of control unit 22, the output of constant-current decompression driving chip U2 drives foot GATE for controlling
The control end of unit, the electric current of constant-current decompression driving chip U2 arranges first end of foot FB connecting resistance R8,
Second end of resistance R8, the anode of diode D6, first end of resistance R9 and the first of resistance R10
End connects the electric current adjustable side as control unit 22, the negative electrode of diode D6, second end of resistance R9 altogether
And second end of resistance R10 is connected to ground, the lower margin GND ground connection of constant-current decompression driving chip U2 altogether.
In the present embodiment, the electric current from constant-current decompression driving chip U2 arranges foot FB output to backlight lamp bar
Current value be: the electric current of constant-current decompression driving chip U2 arranges the magnitude of voltage of foot FB and the ratio of resistance R8
Value, therefore, in actual applications, can by regulation R8 resistance come regulation unit 22 export to
The electric current of backlight lamp bar.
As an embodiment of the present utility model, pressure unit 23 includes: electric capacity C2, inductance L2, resistance
R1, resistance R2, electric capacity C3 and electric capacity C4.
The of the driving input pin BS, electric capacity C2 of the first termination constant-current decompression driving chip U2 of electric capacity C2
First end of two ends and inductance L2 is connected to the on and off switch output pin SW of constant-current decompression driving chip U2 altogether,
First end of second end of inductance L2, first end of resistance R1, the positive pole of electric capacity C3 and electric capacity C4 is altogether
Connect the outfan as pressure unit 23, first end of the second terminating resistor R2 of resistance R1, resistance R2
Second end of the first end, the negative pole of electric capacity C3 and electric capacity C4 be connected to ground, resistance R1 and resistance R2 altogether
The feed back input foot FB1 of public termination constant-current decompression driving chip U2.
In the present embodiment, constant-current decompression driving chip U2 is the core being integrated with constant-current driving with buck functionality
Sheet.Existing constant-current driven chip and existing blood pressure lowering chip will combine and obtain constant-current decompression driving chip
U2.In actual applications, pressure unit can be regulated by arranging resistance R1 and the resistance of resistance R2
The magnitude of voltage of 23 outputs.
As an embodiment of the present utility model, boosting unit 21 includes: inductance L1, diode D5, electricity
Resistance R5, NMOS tube Q1, resistance R6 and electric capacity C5.
The input that first end is boosting unit 21 of inductance L1, second end of inductance L1 and NMOS tube
Drain electrode be connected to the anode of diode D5 altogether, the negative electrode of diode D5 connects conduct altogether with the positive pole of electric capacity C5
The outfan of boosting unit 21, second end of the grid connecting resistance R5 of NMOS, first end of resistance R5
For the switch terminals of boosting unit 21, first end of the source electrode connecting resistance R6 of NMOS, the second of resistance R6
End is connected to ground altogether with the negative pole of electric capacity C5.
In the present embodiment, the operation principle of boosting unit 21 is: when NMOS tube Q1 turns on, electricity
The constant voltage DC electricity that power module 1 is exported by sense L1 is converted to magnetic field energy and stores；When NMOS tube Q1
Having no progeny in pass, the magnetic field energy that inductance L1 is stored is converted to electric field energy, and this electric field energy is defeated with power module 1
After the constant voltage DC electricity superposition gone out, obtained the DC voltage smoothed by the filtering of diode D5 and electric capacity C5
Being supplied to backlight lamp bar, the voltage finally exported due to boosting unit 21 is the constant voltage exported by power module 1
The electric energy that unidirectional current is converted to the magnetic field energy of inductance L1 superposes formation, and therefore, boosting unit 21 is defeated
The voltage gone out is higher than the voltage of power module 1 output.
In the present embodiment, the brightness adjustment control foot PWM of constant-current decompression driving chip U2 is able to receive that 100HZ
To the low frequency pwm signal of 1KHZ, according to the brightness adjustment control foot PWM of constant-current decompression driving chip U2,
The output of constant-current decompression driving chip U2 drives foot GATE to export a square wave, is used for driving NMOS tube
Q1, makes NMOS tube Q1 carry out turn-on and turn-off according to default dutycycle, thus completes output voltage
Control.
This utility model embodiment additionally provides a kind of display device, and this display device includes that mainboard and display are single
Unit, described display unit includes backlight lamp bar, this display device can be LCD TV, liquid crystal display,
LED television, light-emitting diode display etc., mainboard is the main control board for controlling display device work, aobvious
Show unit be the display unit of the display floater in display device, such as LCD TV be exactly display panels,
The display unit of LED television is exactly LED display panel.Described display device also includes above-described embodiment institute
The power driving circuit provided.
Below in conjunction with operation principle, embodiment of the present utility model is described further:
As it is shown on figure 3, the 12V voltage of power module 1 output is given to constant-current decompression driving chip U2 simultaneously
Supply pin VIN and the input of boosting unit 21, the output of constant-current decompression driving chip U2 drives foot
GATE exports a square wave to control conducting and the shutoff of NMOS tube Q1, when NMOS tube Q1 turns on,
The constant voltage DC electricity that power module 1 is exported by inductance L1 is that magnetic field energy stores；When NMOS tube Q1
Having no progeny in pass, the magnetic field energy that inductance L1 is stored is converted to electric field energy, and this electric field energy is defeated with power module 1
After the constant voltage DC electricity superposition gone out, obtained the DC voltage smoothed by the filtering of diode D5 and electric capacity C5
Being supplied to backlight lamp bar, constant-current decompression driving chip U2 arranges foot FB by its electric current to export one constant simultaneously
Electric current drives backlight lamp bar.And constant-current decompression driving chip U2 is common with pressure unit 23 to voltage module
The 12V voltage of output carries out blood pressure lowering process, obtains 5V voltage, powers for mainboard and display unit.
This utility model embodiment includes the power drives electricity of power module and drive control module by employing
Road, is exported a constant voltage DC by power module electric to drive control module, and by drive control module to institute
State constant voltage DC electricity and carry out boosting and blood pressure lowering process, respectively obtain backlit operation voltage and display running voltage,
Power for backlight lamp bar, mainboard and display unit, and then achieve power module and only need to export a road constant voltage
The purpose that the load of multiple different operating voltages just can be powered by unidirectional current, overcomes in prior art and deposits
Power module use multiple-channel output time, the problem that the intermodulation of power supply, efficiency etc. can be produced impact, with
Time, simplify circuit structure, save pcb board space, reduce cost.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model,
All any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, all should
Within being included in protection domain of the present utility model.
Claims (6)
1. a power driving circuit for display device, the first voltage output end of described power driving circuit and
Current output terminal connects the backlight lamp bar in the display unit of described display device, described power driving circuit simultaneously
The second voltage output end connect mainboard and the display unit of described display device simultaneously；Described power driving circuit
Including power module, described power module output constant voltage DC electricity, it is characterised in that described power drives electricity
Road also includes the outfan of drive control module, the input of described drive control module and described power module
Connecting, the first outfan of described drive control module, the second outfan and the 3rd outfan are respectively institute
State the first voltage output end of power driving circuit, current output terminal and the second voltage output end；
Described drive control module by described constant voltage DC electricity boost in voltage to backlit operation voltage and to described
Backlight lamp bar carries out constant current-supplying driving, and meanwhile, described drive control module is by the electricity of described constant voltage DC electricity
Pressure drop is depressed into display running voltage, and powers for described mainboard and described display unit.
2. power driving circuit as claimed in claim 1, it is characterised in that described drive control module bag
Include boosting unit, control unit and pressure unit；
The input of described boosting unit and the input of described control unit connect altogether and control mould as described driving
The input of block, the outfan of described boosting unit is the first outfan of described drive control module, described
The switch terminals controlling the described boosting unit of termination of control unit, the electric current adjustable side of described control unit is institute
Stating the second outfan of drive control module, the output of described control unit terminates the input of described pressure unit
End, the outfan of described pressure unit is the 3rd outfan of described drive control module；
Described control unit controls the described boosting unit boost in voltage by described constant voltage DC electricity to backlit operation
Voltage is that described backlight lamp bar is powered, and meanwhile, described control unit output one driving electric current drives described backlight
Lamp bar；Described control unit and described pressure unit are jointly by the voltage step-down extremely display of described constant voltage DC electricity
Running voltage is also powered for described mainboard and described display unit.
3. power driving circuit as claimed in claim 2, it is characterised in that described control unit includes:
Constant-current decompression driving chip U2, resistance R7, resistance R8, diode D6, resistance R9 and resistance R10；
The input that supply pin is described control unit of described constant-current decompression driving chip U2, described constant current
The brightness adjustment control foot of blood pressure lowering driving chip U2 connects external dimmer pwm signal by described resistance R7, described
The feed back input foot of constant-current decompression driving chip U2, driving input pin and on and off switch output pin are made jointly
For the outfan of described control unit, the output of described constant-current decompression driving chip U2 drives foot to be described control
The control end of unit processed, the electric current of described constant-current decompression driving chip U2 arranges foot and connects the of described resistance R8
One end, second end of described resistance R8, the anode of described diode D6, first end of described resistance R9
And first end of described resistance R10 connects the electric current adjustable side as described control unit, described diode altogether
Second end of the negative electrode of D6, second end of described resistance R9 and described resistance R10 is connected to ground altogether, described
The lower margin ground connection of constant-current decompression driving chip U2.
4. power driving circuit as claimed in claim 3, it is characterised in that described pressure unit includes:
Electric capacity C2, inductance L2, resistance R1, resistance R2, electric capacity C3 and electric capacity C4；
The driving input pin of the first described constant-current decompression driving chip U2 of termination of described electric capacity C2, described electricity
First end of the second end and described inductance L2 that hold C2 is connected to the electricity of described constant-current decompression driving chip U2 altogether
Source switch output pin, second end of described inductance L2, first end of described resistance R1, described electric capacity C3
Positive pole and first end of described electric capacity C4 connect the outfan as described pressure unit, described resistance altogether
First end of the second described resistance R2 of termination of R1, first end of described resistance R2, described electric capacity C3
Second end of negative pole and described electric capacity C4 is connected to ground altogether, and described resistance R1 is public with described resistance R2's
Terminate the feed back input foot of described constant-current decompression driving chip U2.
5. power driving circuit as claimed in claim 4, it is characterised in that described boosting unit includes:
Inductance L1, diode D5, resistance R5, NMOS tube Q1, resistance R6 and electric capacity C5；
The input that first end is described boosting unit of described inductance L1, second end of described inductance L1 with
The drain electrode of described NMOS tube is connected to the anode of described diode D5 altogether, the negative electrode of described diode D5 with
The positive pole of described electric capacity C5 connects the outfan as described boosting unit altogether, and the grid of described NMOS meets institute
State second end of resistance R5, the switch terminals that the first end is described boosting unit of described resistance R5, described
The source electrode of NMOS meets first end of described resistance R6, second end of described resistance R6 and described electric capacity C5
Negative pole be connected to ground altogether.
6. a display device, described display device includes that mainboard and display unit, described display unit include
Backlight lamp bar, it is characterised in that described display device also includes as described in claim 1-5 any one
Power driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620474853.3U CN205751480U (en) | 2016-05-19 | 2016-05-19 | A kind of display device and power driving circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620474853.3U CN205751480U (en) | 2016-05-19 | 2016-05-19 | A kind of display device and power driving circuit thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107705758A (en) * | 2017-10-26 | 2018-02-16 | 惠科股份有限公司 | Display system and current driving method |
| CN107845367A (en) * | 2017-11-13 | 2018-03-27 | 合肥惠科金扬科技有限公司 | Multifunctional led backlight drive circuit and display device |
| CN108231014A (en) * | 2018-02-08 | 2018-06-29 | 深圳创维－Rgb电子有限公司 | A kind of local dimming constant-current control circuit, driving power and television set |
| CN109410868A (en) * | 2018-12-06 | 2019-03-01 | 深圳市华星光电半导体显示技术有限公司 | Display panel drive device |
| CN110047444A (en) * | 2019-05-15 | 2019-07-23 | 昆山龙腾光电有限公司 | Light source driving circuit and liquid crystal display device |
| CN110708807A (en) * | 2019-10-30 | 2020-01-17 | 南京宁麒智能计算芯片研究院有限公司 | Common-cathode LED driving circuit, chip, display circuit and display method |
| CN111724747A (en) * | 2019-03-20 | 2020-09-29 | 海信视像科技股份有限公司 | Display device and power supply starting method |
| CN118116304A (en) * | 2024-01-17 | 2024-05-31 | 重庆惠科金渝光电科技有限公司 | Driving circuit of display panel and display device |
-
2016
- 2016-05-19 CN CN201620474853.3U patent/CN205751480U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107705758A (en) * | 2017-10-26 | 2018-02-16 | 惠科股份有限公司 | Display system and current driving method |
| CN107845367A (en) * | 2017-11-13 | 2018-03-27 | 合肥惠科金扬科技有限公司 | Multifunctional led backlight drive circuit and display device |
| CN107845367B (en) * | 2017-11-13 | 2024-02-20 | 合肥惠科金扬科技有限公司 | Multifunctional LED backlight driving circuit and display device |
| CN108231014A (en) * | 2018-02-08 | 2018-06-29 | 深圳创维－Rgb电子有限公司 | A kind of local dimming constant-current control circuit, driving power and television set |
| CN109410868A (en) * | 2018-12-06 | 2019-03-01 | 深圳市华星光电半导体显示技术有限公司 | Display panel drive device |
| CN111724747A (en) * | 2019-03-20 | 2020-09-29 | 海信视像科技股份有限公司 | Display device and power supply starting method |
| CN110047444A (en) * | 2019-05-15 | 2019-07-23 | 昆山龙腾光电有限公司 | Light source driving circuit and liquid crystal display device |
| CN110708807A (en) * | 2019-10-30 | 2020-01-17 | 南京宁麒智能计算芯片研究院有限公司 | Common-cathode LED driving circuit, chip, display circuit and display method |
| CN118116304A (en) * | 2024-01-17 | 2024-05-31 | 重庆惠科金渝光电科技有限公司 | Driving circuit of display panel and display device |
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Effective date of registration: 20201222 Address after: No.1 Huike Road, Wujia Town, Fucheng District, Mianyang City, Sichuan Province Patentee after: Mianyang Huike Photoelectric Technology Co.,Ltd. Address before: 230012 northeast corner of the intersection of Jiudingshan road and Kuihe Road, Xinzhan District, Hefei City, Anhui Province Patentee before: HEFEI HUIKE JINYANG TECHNOLOGY Co.,Ltd. |