CN108399898A - A kind of television set - Google Patents
A kind of television set Download PDFInfo
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- CN108399898A CN108399898A CN201810471963.8A CN201810471963A CN108399898A CN 108399898 A CN108399898 A CN 108399898A CN 201810471963 A CN201810471963 A CN 201810471963A CN 108399898 A CN108399898 A CN 108399898A
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- inductance
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- control module
- backlight
- 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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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of television set, is related to display technology field, includes the backlight drive circuit for providing driving current to light emitting module, which includes：The anode of control module, inductance, afterflow module, capacitance, light emitting module is connected to backlight driving voltage output end；Capacitance is connected in parallel on the both ends of light emitting module；The first end of inductance is connected to the cathode of light emitting module, and the second end of inductance is connected to the first end of control module, the second end ground connection of control module；The first end of afterflow module is connected between inductance and control module, and the second end of afterflow module is connected to backlight driving voltage output end；When the second end of the first end of control module and the control module is connected, driving current is followed by light emitting module, inductance and control module；When the second end of the first end of control module and the control module disconnects, driving current is followed by light emitting module, inductance and afterflow module.The present invention is used to show the manufacture of equipment.
Description
The application is entitled " a kind of backlight drive circuit, the backlight module and aobvious proposed on May 06th, 2016
Show equipment " Chinese invention patent application 201610302178.0 divisional application.
Technical field
The present invention relates to display technology field more particularly to a kind of television sets.
Background technology
With the continuous development of display technology, application of the backlight module in various display equipment is very universal.Usually
Backlight module accesses supply voltage by backlight drive circuit and adjusts supply voltage under the control of pulse width modulating signal
Driving voltage is generated, and then is shone under the driving of driving voltage.
Invention content
The embodiment of the present invention provides a kind of television set, for reducing or avoiding backlight drive circuit in whole work process
In electromagnetic interference.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
In a first aspect, a kind of backlight drive circuit is provided, including：Voltage transformation module, control module, inductance, afterflow mould
Block and LED light bar, which is characterized in that the backlight drive circuit further includes the filtering mould for being connected to the LED light bar cathode
Block；
The voltage transformation module connection electric network source and backlight driving voltage output end, are used for the electric network source
Output voltage be converted to backlight driving voltage；
The anode of the LED light bar connects the backlight driving voltage output end, described in the cathode connection of the LED light bar
The first end of filter module；
The filter module is used to absorb the surge current in the driving current of the cathode outflow of the LED light bar；
The first end of the inductance connects the second end of the filter module, and the second end of the inductance connects the control
The first end of module；
The second end of the control module is grounded, and the control terminal of the control module is for receiving control signal, the control
The second end for the first end and the control module that molding block is used to control the control module according to the control signal is connected
Or it disconnects；
The afterflow module connects the second end of the inductance and the backlight driving voltage output end, in the control
When the disconnection of the second end of the first end of molding block and the control module, second end and the backlight that the inductance is connected are driven
Dynamic voltage output end.
Second aspect provides a kind of backlight module, including the backlight drive circuit described in first aspect.
The third aspect provides a kind of display equipment, including the backlight module described in second aspect.
Backlight drive circuit provided in an embodiment of the present invention, including voltage transformation module, control module, inductance, afterflow mould
Block, LED light bar and the filter module for being connected to LED light bar cathode；Wherein, voltage transformation module can be by the defeated of electric network source
Going out voltage and is converted to backlight driving voltage, control module can control first end and second end and be turned on or off, and the first of inductance
The second end of end connection filter module, the first end of the second end link control module of inductance, so inductance can be in control mould
Electric energy is stored by the driving current that backlight driving voltage output end exports when conducting is connected with second end for the first end of block, is being controlled
Driving current is provided to LED light bar by the electric energy of storage when the first end of molding block is disconnected with second end, afterflow module can
In the disconnection of the second end of the first end and control module of control module, second end and the backlight driving voltage that inductance is connected are defeated
Outlet；Again because the anode of LED light bar connects backlight driving voltage output end, backlight driving voltage output end can be passed through
The driving current of offer shines；So can ensure that the light source in backlight group module is normally sent out in above-described embodiment first
Light, it further includes being connected to the filter module of LED light bar cathode, and filter mould that secondly the embodiment of the present invention, which provides backlight drive circuit,
Block can absorb the surge current in the driving current of the cathode outflow of LED light bar, so no matter LED light bar is turned by voltage
The backlight driving voltage that mold changing block provides shine or the electric energy that is stored by inductance shines, and filter module can be with
Surge current in the driving current of LED light bar is absorbed, so the embodiment of the present invention can reduce or backlight is avoided to drive
Dynamic electromagnetic interference of the circuit in whole work process.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the circuit diagram of backlight drive circuit in the prior art；
Fig. 2 is the schematic diagram of backlight drive circuit provided in an embodiment of the present invention；
Fig. 3 is another backlight drive circuit schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of circuit diagram of backlight drive circuit provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram of another backlight drive circuit provided in an embodiment of the present invention；
Fig. 6 is the equivalent circuit diagram of inductance provided in an embodiment of the present invention；
Fig. 7 is the impedance schematic diagram with frequency change of inductance provided in an embodiment of the present invention；
Fig. 8 is the impedance schematic diagram with frequency change of inductance 23 provided in an embodiment of the present invention and magnetic bead L；
Fig. 9 is the EMC provided in an embodiment of the present invention that analog simulation experiment acquisition is carried out to existing backlight drive circuit
Oscillogram；
Figure 10 is the waveform that backlight drive circuit provided in an embodiment of the present invention carries out the EMC that analog simulation experiment obtains
Figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention can be thin film transistor (TFT) or field-effect tube or other characteristic phases
Same device, is mainly switching transistor according to transistor used by effect the embodiment of the present invention in circuit.Due to
Here the source electrode of the switching transistor used, drain electrode are symmetrical, so its source electrode, drain electrode can be interchanged.In addition this hair
Switching transistor used by bright embodiment includes two kinds of p-type switching transistor and N-type switching transistor, wherein p-type switchs
Transistor is connected when grid is low level, ends when grid is high level, and it is high level that N-type switching transistor, which is in grid,
When be connected, grid be low level when end.
Wherein, supply voltage is adjusted in backlight drive circuit under the control of pulse width modulating signal and generates driving voltage
Circuit be BUCK circuits (also known as：Buck conversion circuit).
Shown in referring to Fig.1, a kind of existing backlight drive circuit includes：Diode D, triode Q, inductance L, capacitance C with
And resistance R；Wherein, capacitance C is connected in parallel on the both ends of the back light 11 of backlight module, and inductance L is connected to back light 11 and three
Between the source electrode of pole pipe Q, the drain electrode of triode Q is grounded by resistance R, and the grid of triode Q connects pulse width modulating signal
Between the anode connection inductance L and triode Q of input terminal P, diode D, the cathode connection backlight driving voltage of diode D is defeated
Enter to hold V.When triode Q is connected, electric current flows separately through back light 11, inductance L, triode Q after being flowed by voltage input end V
And resistance R, as with the arrow shown in solid in Fig. 1；When triode Q ends, electric current divides after being flowed by voltage input end V
Back light 11, inductance L and diode D are not flowed through, as shown in dotted line with the arrow in Fig. 1.The ideal waveform figure of its electric current
For：When triode Q is connected；The electric current linear rise of inductance L and triode Q are flowed through, no current flows through diode D；Three
When pole pipe Q cut-offs；The electric current linear rise of diode D is flowed through, no current flows through triode Q.However, because backlight drive circuit
During the work time triode Q can high frequency switch between on and off and there are leakage inductances, so triode Q and two poles
Pipe D will produce surge current and peak voltage surge current on and off, in turn result in serious electromagnetic interference source, shadow
Ring the Electro Magnetic Compatibility (full name in English of backlight drive circuit：Electro Magnetic Compatibility, referred to as：EMC).
In the prior art in order to inhibit electromagnetic interference, the Electro Magnetic Compatibility of backlight drive circuit is improved, by diode D
Anode connect between inductance L and the tie point of triode Q a magnetic bead, absorb the surge in the electric current for flowing through diode D
Electric current, still, the duty ratio of triode Q turn-on times is 75% in the usual backlight drive circuit course of work, and this scheme
The surge current in the electric current for flowing through diode D can only be absorbed, so 25% electromagnetic interference below can only be inhibited.
The embodiment of the present invention provides backlight drive circuit, and with reference to shown in Fig. 2, which includes：Voltage turns
Change the mold block 21, control module 22, inductance 23, afterflow module 24, LED light bar 25 and the filtering for being connected to 25 cathode of LED light bar
Module 26.
Voltage transformation module 21 connects electric network source e and backlight driving voltage output end V, for by electric network source e's
Output voltage is converted to backlight driving voltage；
The anode of LED light bar 25 connects backlight driving voltage output end V, and the cathode of LED light bar 25 connects filter module 26
First end；
Filter module 26 is used to absorb the surge current in the driving current of the cathode output of LED light bar 25；
The second end of the first end connection filter module 26 of inductance 23, the of the second end link control module 22 of inductance 23
One end；
The second end of control module 22 is grounded, and the control terminal S of control module 22 is for receiving control signal, control module 22
The second end of first end and control module for controlling control module according to control signal is turned on or off；
Afterflow module 24 connects the second end and backlight driving voltage output end V of inductance 23, in control module 22
When the disconnection of the second end of first end and control module, the second end and backlight driving voltage output end V of inductance 23 is connected.
Backlight drive circuit provided in an embodiment of the present invention, including voltage transformation module, control module, inductance, afterflow mould
Block, LED light bar and the filter module for being connected to LED light bar cathode；Wherein, voltage transformation module can be by the defeated of electric network source
Going out voltage and is converted to backlight driving voltage, control module can control first end and second end and be turned on or off, and the first of inductance
The second end of end connection filter module, the first end of the second end link control module of inductance, so inductance can be in control mould
Electric energy is stored by the driving current that backlight driving voltage output end exports when conducting is connected with second end for the first end of block, is being controlled
Driving current is provided to LED light bar by the electric energy of storage when the first end of molding block is disconnected with second end, afterflow module can
In the disconnection of the second end of the first end and control module of control module, second end and the backlight driving voltage that inductance is connected are defeated
Outlet；Again because the anode of LED light bar connects backlight driving voltage output end, backlight driving voltage output end can be passed through
The driving current of offer shines；So can ensure that the light source in backlight group module is normally sent out in above-described embodiment first
Light, it further includes being connected to the filter module of LED light bar cathode, and filter mould that secondly the embodiment of the present invention, which provides backlight drive circuit,
Block can absorb the surge current in the driving current of the cathode outflow of LED light bar, so no matter LED light bar is turned by voltage
The backlight driving voltage that mold changing block provides shine or the electric energy that is stored by inductance shines, and filter module can be with
Surge current in the driving current of LED light bar is absorbed, so the embodiment of the present invention can reduce or backlight is avoided to drive
Dynamic electromagnetic interference of the circuit in whole work process.Generated pulse spike when control module opening and closing can also be solved simultaneously.
Further, with reference to shown in Fig. 3, above-mentioned backlight drive circuit further includes：Clamp diode 27；
The plus earth of clamp diode 27, the first end of the cathode connection inductance 23 of clamp diode 27；For controlling
The voltage of the first end of inductance 23 is adjusted to the threshold value of clamp diode 27 by the first end of molding block 22 when being disconnected with second end
Voltage.
Compared to backlight drive circuit shown in Fig. 2, the backlight drive circuit in the embodiment of the present invention increases diode 27,
And the voltage of the first end of inductance 23 is adjusted to the threshold voltage of clamp diode 27, institute when 23 second end of inductance is earth-free
Further LED light bar can be adjusted when the first end of control module 22 and the second end of ground connection disconnect cloudy with the embodiment of the present invention
The voltage of pole, makes the voltage stabilization of LED light bar cathode, and then further avoids LED light bar and generate electromagnetic radiation.
Specifically, referring to backlight drive circuit shown in Fig. 4 circuit diagram in above-described embodiment each module it is specific
Structure is described in detail.
Control module 22 in backlight drive circuit shown in above-mentioned Fig. 2 or 3 is specially a transistor T1；
The second end of the source electrode connection inductance 23 of transistor T1, the grid of the grounded drain of transistor T1, transistor T1 are
The control terminal S of control module 22.
Preferably, transistor T1 can be MOS memory (full name in English： metal oxide
Semiconductor, referred to as：Metal-oxide-semiconductor).
Afterflow module 24 in backlight drive circuit shown in above-mentioned Fig. 2 or 3 is specially the first diode D1；
The second end of the anode connection inductance 23 of first diode D1, the cathode connection backlight drive electricity of the first diode D1
Press output end V.
Filter module 26 in backlight drive circuit shown in above-mentioned Fig. 2 or 3 is specially a magnetic bead L；
The cathode of the first end connection LED light bar 25 of magnetic bead L, the first end of the second end connection inductance 23 of magnetic bead L.
It is formed specifically, magnetic bead is usually made by the ferrimagnetic material of cubic lattice structure, function is mainly eliminated
The radio noise being present in transmission line circuit.Magnetic bead has very high resistivity and magnetic conductivity, he is equivalent to resistance and inductance
Series connection, but resistance value and inductance value all change with power frequency in transmission line.Magnetic bead is in low-frequency range, resistance value very little, impedance
Mainly be made of the induction reactance of inductance, inductance value is larger, therefore under low-frequency range, magnetic bead be a low-loss, high quality factor electricity
Sense.In high band, as frequency increases, the magnetic conductivity of magnetic bead reduces, and the inductance value of inductance reduces, therefore impedance is mainly by resistance
Ingredient is constituted, therefore when high-frequency signal passes through magnetic bead, electromagnetic interference, which is absorbed and is converted into the form of thermal energy, to be dissipated.
In addition, those skilled in the art are probably thought of and replace above-mentioned reality with inductance on the basis of in the above-described embodiments
Apply the magnetic bead in example, but compared to inductance, magnetic bead has better High frequency filter characteristic, presented in high frequency it is resistive, can be in phase
When keeping higher impedance in wide frequency range, to improve frequency modulation filter effect, it is therefore preferred that above-mentioned filter module by
Magnetic bead is formed.
Optionally, referring to Figure 5, backlight drive circuit further includes：One capacitance C；
The first end of the second pole connection inductance 23 of the first pole connection backlight driving voltage the output end V, capacitance C of capacitance C.
Further alternative, above-mentioned backlight drive circuit further includes：Voltage stabilizing module 28；
Voltage stabilizing module 28 connects backlight driving voltage output end V, and the backlight exported for burning voltage conversion module 21 is driven
Dynamic voltage.
Illustratively, Voltage stabilizing module 28 is specifically as follows capacitance, wherein the first pole connection backlight driving voltage of capacitance is defeated
Outlet V, the second pole ground connection of capacitance.
The N-type transistor ended when conducting, low level when below using transistor T1 as grid high level is to shown in above-mentioned Fig. 5
The operation principle of backlight drive circuit illustrate.
When controlling signal high level, when the grid high level of transistor T1, transistor T1 conductings, the second end of inductance 23
Be grounded by transistor T1, at this time backlight driving voltage output end V, LED light bar 25, magnetic bead L, inductance 23, transistor T1 and
The earth forms current loop, and backlight driving voltage output end V inputs driving current to LED light bar 25, and electric current flows successively through LED
Lamp bar 25, magnetic bead L, inductance 23, transistor T1 finally flow into the earth, while capacitance C chargings.Electricity in this stage in inductance 23
Stream increases, and due to the characteristic of inductive obstacle curent change, inductance 23 is equivalent to a power supply, and the first end of inductance 23 is equivalent to
Positive pole is high level；The second end of inductance 23 is equivalent to power cathode, is low level, so in this stage, the one or two pole
The anode voltage of pipe D1 is less than cathode voltage, and the first diode D1 cut-offs, second end and the backlight driving voltage of inductance 23 export
Hold V open circuits.The anode voltage of second diode D2 is less than cathode voltage, and the second diode D2 cut-offs, the first end of inductance 23 is not
Ground connection.Inductance 23 also charges while hindering curent change in this stage.Because of the driving of LED light bar 25 in stage thus
Voltage needs to flow through magnetic bead L, so magnetic bead L can absorb the surge current in driving circuit, and is converted into thermal energy
Form dissipates.
When controlling signal low level, the grid low level of transistor T1, transistor T1 cut-offs, the second end of inductance 23 is not
Ground connection.Electric current in inductance 23 reduces, and due to the characteristic of inductive obstacle curent change, inductance 23 is equivalent to a power supply, and electricity
The first end of sense 23 is equivalent to power cathode, is low level；The second end of inductance 23 is equivalent to positive pole, is high level, institute
It is higher than cathode voltage, the first diode D1 conductings with the anode voltage of the first diode D1 in this stage；LED light bar 25, inductance
23, magnetic bead L, the first diode D1 form current loop, and inductance 23 and capacitance C start the electric energy stored in release on last stage,
Current loop, which is formed, by LED light bar 25, inductance 23, magnetic bead L, the first diode D1 provides driving current to LED light bar.Because
The driving voltage of LED light bar 25 needs to flow through magnetic bead L in this stage, so magnetic bead L can be to the surge current in driving current
It is absorbed, and the form for being converted into thermal energy dissipates.In addition, the anode voltage of the second diode D2 is higher than cathode voltage, the
Two diode D2 conductings, so the threshold voltage that the voltage of 23 first end of inductance is the second diode D2 in this stage, so can
So that the current potential of the cathode of LED light bar 25 is stablized.
No matter be connected in transistor T1 it can be seen from the operation principle of above-mentioned backlight drive circuit, backlight driving voltage
When output end V output driving currents, or in transistor T1 cut-offs, 23 output driving current of inductance, driving current is both needed to flow
Through magnetic bead L, so the backlight drive circuit that above-described embodiment provides can be right in the whole work process of backlight drive circuit
Surge current in driving current is absorbed, and then reduces or avoid electromagnetic interference.
In addition, in the backlight drive circuit that the prior art provides, since magnetic bead is connected between diode and triode,
So the due to voltage spikes generated when triode Q is turned off may also result in the damage of triode Q.And it is provided in the embodiment of the present invention
Backlight drive circuit in, the first diode D1 and transistor T1 are not connect with magnetic bead L directly, so in transistor T1
Be not in higher peak voltage when shutdown, between the source electrode and drain electrode of transistor T1, it is possible to avoid transistor T1's
Damage, and then ensure the reliability of backlight drive circuit.
It should also be noted that, the P be connected when cut-off, low level when grid high level can also be used in above-described embodiment
Transistor npn npn is hung according to P-type crystal, then needs the control signal of control signal input being adjusted to and use N-type crystal
The control signal of opposite in phase when pipe.
Hereinafter, further being carried out to the principle of absorption of the surge current in driving current to magnetic bead in above-described embodiment detailed
Explanation.
First, with reference to shown in Fig. 6, figure is the equivalent-circuit model of inductance L, including an inductance L1, a capacitance C1 and one
Resistance R1.Wherein, it is in parallel with capacitance C1 again after inductance L1 connects with resistance R1.
Capacitance C1 is in circuit to inhibition caused by alternating current in circuit model：
Wherein, C is the capacitance of capacitance C1；F is frequency；J is current density；ω is angular frequency, i.e. the capacitive reactance of inductance L
Inductance L1 is jointly in circuit to inhibition caused by alternating current in circuit model：
ZL=j2 π fL=j ω L；
Wherein, L is the inductance value of inductance L1；F is frequency；J is current density；ω is angular frequency, i.e. the induction reactance Z of inductance LL
=j ω L.
Resistance R1, capacitance C1 and inductance L1 are jointly in circuit to inhibition caused by alternating current in circuit model：
Wherein, R is the resistance value of resistance R1；C is the capacitance of capacitance C1；L is the inductance value of inductance L1；F is frequency；J is electricity
Current density；ω is angular frequency, i.e. the impedance of inductance L；Evaluation in parallel in // indication circuit.The then impedance of inductance L
It can be obtained by Computer Corp. of the capacitive reactance of above-mentioned inductance, reactance and impedance：As frequency f increases, inductance L's
Inductance induction reactance ZLIncrease, the inductance capacitive reactance Z of inductance LCReduce.When frequency f is more than resonant frequency f0After, inductance will present out electricity
Capacitive.Shown in specific reference Fig. 7, Fig. 7 is inductance frequency and impedance ZHFLChange curve.In 0≤f of frequency≤f0Area
In, inductance characteristic is presented in inductance, and as frequency f increases, the impedance Z of inductanceHFLGradually increase, and in f=f0Impedance ZHFL
Reach maximum value；As f ＞ f0When, capacitive character, the impedance Z of inductance is presented in inductanceHFLIncrease with frequency f and reduces.
Further, with reference to shown in Fig. 8, Fig. 8 is that the impedance of the inductance 23 and magnetic bead L in the embodiment of the present invention becomes with frequency
The curve graph of change.Wherein solid line indicates that the impedance trend with frequency change of inductance 23, dotted line indicate the impedance of magnetic bead L with frequency
The trend of variation.The impedance of inductance 23 reaches maximum when frequency is 300KHZ, and capacitive character is presented when frequency is more than 300KHZ,
Impedance is gradually reduced；And the impedance of magnetic bead L just reaches maximum when frequency is 200MHZ.So the magnetic bead L in above-described embodiment
The surge current of high frequency can be absorbed, and inductance 23 can conduct surge current, be not converted into magnetic energy and deposit
Storage.
Further, with reference to shown in Fig. 9,10, Fig. 9 is to be obtained after carrying out analog simulation experiment to existing backlight drive circuit
The EMC oscillograms gone out；Figure 10 is to be obtained after carrying out analog simulation experiment to the backlight drive circuit that the embodiment of the present invention provides
EMC oscillograms.The analog simulation experiment of the backlight drive circuit provided is provided to existing backlight drive circuit and the present invention
Oscillogram is compared it is found that surge current is substantially reduced in the embodiment of the present invention, so the present invention can be smaller or avoids
Electromagnetic interference in backlight drive circuit.
Yet another embodiment of the invention provides a kind of backlight module, which includes the back of the body that any of the above-described embodiment provides
Light drive circuit.
Backlight drive circuit in backlight module provided in an embodiment of the present invention, including voltage transformation module, control module,
Inductance, afterflow module, LED light bar and the filter module for being connected to LED light bar cathode；Wherein, voltage transformation module can incite somebody to action
The output voltage of electric network source is converted to backlight driving voltage, and control module can control first end and second end and lead on-off
It opens, the second end of the first end connection filter module of inductance, the first end of the second end link control module of inductance, so inductance
The driving current that can be exported by backlight driving voltage output end when conducting is connected with second end in the first end of control module
Electric energy is stored, driving current is provided to LED light bar by the electric energy of storage when the first end of control module is disconnected with second end,
The second end and the back of the body of inductance can be connected in the disconnection of the second end of the first end and control module of control module in afterflow module
Optical drive voltage output end；Again because the anode of LED light bar connects backlight driving voltage output end, can be driven by backlight
The driving current that dynamic voltage output end provides shines；So can ensure first in backlight group module in above-described embodiment
Light source normal luminous, it further includes the filtering mould for being connected to LED light bar cathode that secondly the embodiment of the present invention, which provides backlight drive circuit,
Block, and filter module can absorb LED light bar cathode outflow driving current in surge current, so no matter LED light bar
The electric energy that the backlight driving voltage provided by voltage transformation module shine or stored by inductance shines, and filters
Module can absorb the surge current in the driving current of LED light bar, thus the embodiment of the present invention can reduce or
Avoid electromagnetic interference of the backlight drive circuit in whole work process.
Yet another embodiment of the invention provides a kind of display equipment, which includes the backlight mould that above-described embodiment provides
Group.Specifically, display device can be：Electronic Paper, mobile phone, tablet computer, television set, display, laptop, digital phase
Any product or component with display function such as frame, navigator.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, all answer by the change or replacement that can be readily occurred in
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Wherein, R is the resistance value of resistance R1；C is the capacitance of capacitance C1；L is the inductance value of inductance L1；F is frequency；J is electricity
Current density；ω is angular frequency, i.e. the impedance of inductance L；// indicate
Evaluation in parallel in circuit.The then impedance of inductance L
It can be obtained by Computer Corp. of the capacitive reactance of above-mentioned inductance, reactance and impedance：As frequency f increases, inductance L's
Inductance induction reactance ZLIncrease, the inductance capacitive reactance Z of inductance LCReduce.When frequency f is more than resonant frequency f0After, inductance will present out electricity
Capacitive.Shown in specific reference Fig. 7, Fig. 7 is inductance frequency and impedance ZHFLChange curve.In 0≤f of frequency≤f0Area
In, inductance characteristic is presented in inductance, and as frequency f increases, the impedance Z of inductanceHFLGradually increase, and in f=f0Impedance ZHFL
Reach maximum value；As f ＞ f0When, capacitive character, the impedance Z of inductance is presented in inductanceHFLIncrease with frequency f and reduces.
Further, with reference to shown in Fig. 8, Fig. 8 is that the impedance of the inductance 23 and magnetic bead L in the embodiment of the present invention becomes with frequency
The curve graph of change.Wherein solid line indicates that the impedance trend with frequency change of inductance 23, dotted line indicate the impedance of magnetic bead L with frequency
The trend of variation.The impedance of inductance 23 reaches maximum when frequency is 300KHZ, and capacitive character is presented when frequency is more than 300KHZ,
Impedance is gradually reduced；And the impedance of magnetic bead L just reaches maximum when frequency is 200MHZ.So the magnetic bead L in above-described embodiment
The surge current of high frequency can be absorbed, and inductance 23 can conduct surge current, be not converted into magnetic energy and deposit
Storage.
Further, with reference to shown in Fig. 9,10, Fig. 9 is to be obtained after carrying out analog simulation experiment to existing backlight drive circuit
The EMC oscillograms gone out；Figure 10 is to be obtained after carrying out analog simulation experiment to the backlight drive circuit that the embodiment of the present invention provides
EMC oscillograms.The analog simulation experiment of the backlight drive circuit provided is provided to existing backlight drive circuit and the present invention
Oscillogram is compared it is found that surge current is substantially reduced in the embodiment of the present invention, so the present invention can be smaller or avoids
Electromagnetic interference in backlight drive circuit.
Yet another embodiment of the invention provides a kind of backlight module, which includes the back of the body that any of the above-described embodiment provides
Light drive circuit.
Backlight drive circuit in backlight module provided in an embodiment of the present invention, including voltage transformation module, control module,
Inductance, afterflow module, LED light bar and the filter module for being connected to LED light bar cathode；Wherein, voltage transformation module can incite somebody to action
The output voltage of electric network source is converted to backlight driving voltage, and control module can control first end and second end and lead on-off
It opens, the second end of the first end connection filter module of inductance, the first end of the second end link control module of inductance, so inductance
The driving current that can be exported by backlight driving voltage output end when conducting is connected with second end in the first end of control module
Electric energy is stored, driving current is provided to LED light bar by the electric energy of storage when the first end of control module is disconnected with second end,
The second end and the back of the body of inductance can be connected in the disconnection of the second end of the first end and control module of control module in afterflow module
Optical drive voltage output end；Again because the anode of LED light bar connects backlight driving voltage output end, can be driven by backlight
The driving current that dynamic voltage output end provides shines；So can ensure first in backlight group module in above-described embodiment
Light source normal luminous, it further includes the filtering mould for being connected to LED light bar cathode that secondly the embodiment of the present invention, which provides backlight drive circuit,
Block, and filter module can absorb LED light bar cathode outflow driving current in surge current, so no matter LED light bar
The electric energy that the backlight driving voltage provided by voltage transformation module shine or stored by inductance shines, and filters
Module can absorb the surge current in the driving current of LED light bar, thus the embodiment of the present invention can reduce or
Avoid electromagnetic interference of the backlight drive circuit in whole work process.
Yet another embodiment of the invention provides a kind of display equipment, which includes the backlight mould that above-described embodiment provides
Group.Specifically, display device can be：Electronic Paper, mobile phone, tablet computer, television set, display, laptop, digital phase
Any product or component with display function such as frame, navigator.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, all answer by the change or replacement that can be readily occurred in
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (5)
1. a kind of television set includes the backlight drive circuit for providing driving current to light emitting module, the backlight drive electricity
Road includes：Control module, inductance, afterflow module, capacitance, which is characterized in that
The anode of the light emitting module is connected to backlight driving voltage output end；
The capacitance is connected in parallel on the both ends of the light emitting module；
The first end of the inductance is connected to the cathode of the light emitting module, and the second end of the inductance is connected to the control mould
The first end of block, the second end ground connection of the control module；
The first end of the afterflow module is connected between the inductance and the control module, the second end of the afterflow module
It is connected to the backlight driving voltage output end；
When the control terminal of the control module controls the second end conducting of the first end and the control module of the control module
When, driving current is followed by the light emitting module, the inductance and the control module；
When the second end of first end and the control module that the control terminal of the control module controls the control module disconnects
When, driving current is followed by the light emitting module, the inductance and the afterflow module.
2. television set according to claim 1, which is characterized in that the control module is specially a transistor；
The source electrode of the transistor connects the second end of the inductance, the grounded drain of the transistor, the grid of the transistor
The control terminal of the extremely described control module.
3. television set according to claim 2, which is characterized in that the transistor is metal oxide field effect crystal
Pipe.
4. television set according to claim 1, which is characterized in that the afterflow module is specially the first diode；
The anode of first diode connects the second end of the inductance, and the cathode of first diode connects the backlight
Driving voltage output end.
5. television set according to claim 1, which is characterized in that the backlight drive circuit further includes：Voltage stabilizing module；
The Voltage stabilizing module connects the backlight driving voltage output end, the backlight for stablizing the voltage transformation module output
Driving voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810471963.8A CN108399898A (en) | 2016-05-06 | 2016-05-06 | A kind of television set |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810471963.8A CN108399898A (en) | 2016-05-06 | 2016-05-06 | A kind of television set |
| CN201610302178.0A CN105825820B (en) | 2016-05-06 | 2016-05-06 | A kind of backlight drive circuit, backlight module and display equipment |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610302178.0A Division CN105825820B (en) | 2016-05-06 | 2016-05-06 | A kind of backlight drive circuit, backlight module and display equipment |
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| Publication Number | Publication Date |
|---|---|
| CN108399898A true CN108399898A (en) | 2018-08-14 |
Family
ID=56529195
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810471963.8A Pending CN108399898A (en) | 2016-05-06 | 2016-05-06 | A kind of television set |
| CN201610302178.0A Active CN105825820B (en) | 2016-05-06 | 2016-05-06 | A kind of backlight drive circuit, backlight module and display equipment |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610302178.0A Active CN105825820B (en) | 2016-05-06 | 2016-05-06 | A kind of backlight drive circuit, backlight module and display equipment |
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| CN106101591B (en) * | 2016-08-29 | 2019-07-26 | 青岛海信电器股份有限公司 | The method of adjustment of LCD TV and its backlight driving voltage, device |
| CN108847188A (en) * | 2018-06-05 | 2018-11-20 | 珠海格力电器股份有限公司 | Backlight source circuit and its back light source brightness control method, device and electronic equipment |
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| CN105825820A (en) | 2016-08-03 |
| CN105825820B (en) | 2018-08-10 |
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Application publication date: 20180814 |