CN208848603U - A kind of control circuit and display terminal of backlight - Google Patents
A kind of control circuit and display terminal of backlight Download PDFInfo
- Publication number
- CN208848603U CN208848603U CN201821683939.2U CN201821683939U CN208848603U CN 208848603 U CN208848603 U CN 208848603U CN 201821683939 U CN201821683939 U CN 201821683939U CN 208848603 U CN208848603 U CN 208848603U
- Authority
- CN
- China
- Prior art keywords
- module
- control
- voltage
- power supply
- supply voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model embodiment discloses the control circuit and display terminal of a kind of backlight, the circuit includes the first isolation module, for receiving the export after mainboard powers on first control voltage, and be connected under the action of the first control voltage, the second supply voltage that the first power supply module exports is exported to power factor correction module；Supply voltage control module is used for according to the first control voltage output third supply voltage；Time-sequence control module is used to complete initialization under the action of third supply voltage, and generates the second control voltage to the second isolation module；Second isolation module is used to be connected under the action of the second control voltage, and the second supply voltage is exported to the second power supply module；Second power supply module is used under the action of the second supply voltage, and the voltage signal conversion target supply voltage of power factor correction module output is exported to backlight.By using above scheme, solve since each power supply module is because of the problems such as screen flash caused by electrifying timing sequence or blank screen.
Description
Technical field
The utility model embodiment is related to field of display technology more particularly to a kind of control circuit of backlight and display eventually
End.
Background technique
With making rapid progress for science and technology, the development of electrical equipment having a display function is also to advance by leaps and bounds, and disappear
Requirement of the expense person to display image quality is also higher and higher.To meet consumer demand, electrical equipment producer is also constantly to obtain
The breakthrough of technical aspect.There is the electrical equipment of high dynamic range images (High-DynamicRange, HDR) function at present,
Colour gamut, contrast and depth of field degree etc. can bring user and visually shake sense, user is allowed to be profuse in praise.But because of viewing area
The dimming function in domain has the power supply timing of the control circuit inside electrical equipment when electrical equipment realizes its display function
High requirement.If timing entanglement, the problems such as being easy to cause screen flash, blank screen.
Currently on the market using in more local dimming control circuit, power supply module and PFC electricity are generally given
The supply voltage on road is controlled by the control signal of mainboard generation.When the control signal that mainboard generates is high level, control circuit
In circuit of power factor correction and power supply module will start to work, power supply module can provide supply voltage for backlight.At this point,
If the microcontroller chip in control circuit does not complete initialization also, current constant control can not be carried out to backlight, it may appear that back
Phenomena such as light source scintillation or even blank screen.
Utility model content
The utility model embodiment provides the control circuit and display terminal of a kind of backlight, to realize each power supply module
Orderly power on, solve due to each power supply module because electrifying timing sequence it is unreasonable caused by screen flash or the problems such as blank screen.
In a first aspect, the utility model embodiment provides a kind of control circuit of backlight, it is applied in display terminal,
The display terminal has backlight, wherein the control circuit includes:
First power supply module supplies voltage to mainboard for exporting first after display terminal powers on；
First isolation module is connected, for receiving the mainboard in institute with first power supply module by the mainboard
The the first control voltage exported under the action of the first supply voltage is stated, and is connected under the action of the first control voltage, with
The second supply voltage that first power supply module exports is exported to power factor correction module；
The input terminal of the power factor correction module connects alternating current output end, for the work in second supply voltage
Voltage signal is provided with lower for first power supply module and the second power supply module；
Supply voltage control module, for according to the first control voltage output third supply voltage；
Time-sequence control module is connected with the supply voltage control module, for the effect in the third supply voltage
Lower completion initialization, and the second control voltage is generated to the second isolation module；
Second isolation module is respectively connected with the time-sequence control module and first isolation module, for described
It is connected under the action of second control voltage, second supply voltage is exported to the second power supply module；
Second power supply module is respectively connected with the power factor correction module and second isolation module, is used for
Under the action of second supply voltage, the voltage signal that the power factor correction module is exported converts target supply voltage
It exports to the backlight.
Further, first isolation module includes the first optocoupler and first switch unit；Wherein,
The control terminal of the first switch unit is connected with the mainboard, for receiving the first control electricity of mainboard transmission
Pressure；
The input terminal of the first switch unit is connected with the cathode of the first diode inside first optocoupler, described
The anode of first diode is connected with the first output end of first power supply module；
The second output terminal phase of the collector of the first triode inside first optocoupler and first power supply module
Even, for receiving second supply voltage；The emitter of the first triode inside first optocoupler with described second every
It is connected from module.
Further, second isolation module includes: the second optocoupler and second switch unit；Wherein,
The control terminal of the second switch unit is connected with the output end of the time-sequence control module, for receiving described
Two control voltages；
The collector of the second switch unit is connected with the cathode of the second diode inside second optocoupler；
The collector of the second triode inside second optocoupler and the first triode inside first optocoupler
Emitter is connected；The emitter of the second triode inside second optocoupler is connected with second power supply module.
Further, the control circuit further include:
Third switch unit is connected between the second isolation module and the second power supply module；
Wherein, the control terminal of third switch unit is connected with the emitter of second triode；Third switch unit
Input terminal is connected with the collector of second triode；The output end of third switch unit and the second power supply module phase
Even；
When the second triode is in the conductive state, the third switching means conductive, for second power supply module
Second supply voltage is provided.
Further, the time-sequence control module includes: constant-current control unit and microcontroller chip；Wherein,
The constant-current control unit and the microcontroller chip are connected, for connecing respectively with the supply voltage control module
Receive the supply voltage that the supply voltage control module provides；
First output end of the microcontroller chip is connected with the control terminal of the second switch unit, the microcontroller chip
Second output terminal is connected with the constant-current control unit；
The output end of the constant-current control unit is connected with the backlight, under the control of the microcontroller chip,
Control the constant current hold of the backlight.
Further, the control circuit further include: rectifier diode, filter capacitor, the first divider resistance and second point
Piezoresistance；
The rectifier diode is connected by first divider resistance with the control terminal of the second switch unit；
Second divider resistance is connected in parallel between the control terminal and output end of the second switch unit；
The filter capacitor is connected in parallel on second divider resistance both ends.
Further, the emitter of second triode passes through the control terminal of current-limiting resistance and the third switch unit
It is connected；
Third divider resistance and zener diode have been arranged in parallel between the control terminal and ground of the third switch unit.
Further, the control circuit further include:
Electromagnetic interference suppression module is connected between alternating current output end and the power factor correction module, for institute
It states common mode interference signal in control circuit and DM EMI signal inhibits, and by AF panel treated ac voltage signal
It is rectified into d. c. voltage signal.
Further, the control circuit further include:
Filter module is connected between the power factor correction module and the first power supply module, for power factor
Treated that voltage signal is filtered for correction module.
Second aspect, the utility model embodiment additionally provide a kind of display terminal, which includes backlight, also
Control circuit including backlight provided by the utility model any embodiment.
The utility model embodiment provides the control circuit and display terminal of a kind of backlight, which is applied to
In display terminal, which has backlight.Wherein, which includes: the first power supply module, for whole in display
Output first supplies voltage to mainboard after end powers on；First isolation module is connected, for connecing with the first power supply module by mainboard
The first control voltage that mainboard exports under the action of the first supply voltage is received, and is connected under the action of the first control voltage,
It is exported with the second supply voltage for exporting the first power supply module to power factor correction module；Power factor correction module it is defeated
Enter end connection alternating current output end, for providing under the action of the second supply voltage for the first power supply module and the second power supply module
Voltage signal；Supply voltage control module, for according to the first control voltage output third supply voltage；Time-sequence control module,
It is connected with supply voltage control module, for completing initialization under the action of third supply voltage, and generates the second control electricity
It presses to the second isolation module；Second isolation module is respectively connected with time-sequence control module and the first isolation module, for second
It is connected under the action of control voltage, the second supply voltage is exported to the second power supply module；Second power supply module, with power because
Number correction module and the second isolation module are respectively connected with, and are used under the action of the second supply voltage, by PFC mould
The voltage signal conversion target supply voltage of block output is exported to backlight.By using above-mentioned technical proposal, realize
After the conducting of one isolation module, first control sequential control module completes initialization, then controls the conducting of the second isolation module again, so that
The second supply voltage for obtaining the output of the first power supply module, which can pass through the first isolation module in the conductive state and second, is isolated
Module transfer is to the second power supply module, using the starting voltage as the second power supply module.After the work of the second power supply module, it can incite somebody to action
The voltage signal of power factor correction module output is converted to the target voltage signal of backlight, to avoid for backlight power supply
Screen flash or blank screen etc. caused by first obtaining starting before time-sequence control module completes initialization due to the second power supply module
Problem.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the control circuit for backlight that the utility model embodiment one provides；
Fig. 2 is a kind of structural block diagram of the control circuit for backlight that the utility model embodiment two provides；
Fig. 3 is the circuit diagram that a kind of microcontroller chip that the utility model embodiment two provides controls power supply mode.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of structural block diagram of the control circuit for backlight that the utility model embodiment one provides, which can
It is integrated into the display terminal with backlight, which can be television set or monitor etc..As shown in Figure 1, the back
The control circuit of light source includes: the first power supply module 110, the first isolation module 120, power factor correction module 130, power supply electricity
Press control module 140, time-sequence control module 150, the second isolation module 160 and the second power supply module 170.Wherein,
First power supply module 110 supplies voltage to mainboard for exporting first after display terminal powers on.
In the present embodiment, the first power supply module is preferably AC/DC (ac/dc) power module, which can be defeated
12V voltage is to main board power supply out, and on this basis, the also exportable 20V voltage of the power module is powered to power amplifier.
Illustratively, which can be circuit of reversed excitation or LLC (harmonic conversion) circuit.
In the present embodiment, the first power supply module is connected by the first isolation module with power factor correction module, for for
Power factor correction module provides operating voltage, and power factor correction module is enable to amplify processing to ac signal.
Specifically, the first isolation module 120, is connected by mainboard with the first power supply module 110, for receiving mainboard
The the first control voltage exported under the action of one supply voltage, and be connected under the action of the first control voltage, first is supplied
The second supply voltage that electric module 110 exports is exported to power factor correction module 130.Power factor correction module 130 it is defeated
Enter end connection alternating current output end, for being the first power supply module 110 and the second power supply module under the action of the second supply voltage
170 provide voltage signal.
In the present embodiment, mainboard is also connected with supply voltage control module 140, which is used for
According to the first control voltage output third supply voltage, for the power supply of time-sequence control module 150.Wherein, time-sequence control module
150, it is connected with supply voltage control module 140, after completing initialization under the action of third supply voltage, generates second
Voltage is controlled to the second isolation module 160.Second isolation module 160, with time-sequence control module 150 and the first isolation module 120
It is respectively connected with, for being connected under the action of the second control voltage, the second supply voltage that the first power supply module 110 is generated
It is exported by the first isolation module 120 in the conductive state to the second power supply module 170, so that the second power supply module is in timing
Control module 150 is started again after completing initialization.
Further, in the present embodiment, time-sequence control module includes current constant control voltage and microcontroller chip, wherein constant current
Control unit is used to control the constant current hold of backlight, and microcontroller chip is used to complete just under the action of third supply voltage
After beginningization, the second control voltage is generated to the second isolation module, to control the conducting of the second isolation module.
It is understood that in the present embodiment, the second isolation module can be used as the switch of the second power supply module starting, when the
After the conducting of two isolation modules, the second power supply module is just operable.And the second power supply module mainly provides confession for backlight
Therefore piezoelectric voltage is controlled by using time-sequence control module, may make opening for the first isolation module and the second isolation module
It is dynamic be divided into timing successively, and can be after time-sequence control module completes initialization, the second power supply module of control is backlight
Source provides supply voltage, improves the electrifying timing sequence of backlight in the prior art, solves and lead since electrifying timing sequence is unreasonable
The screen flash or blank screen problem of cause.
Specifically, the second power supply module 170 in the present embodiment, with power factor correction module 130 and the second isolation mode
Block 160 is respectively connected with.After the conducting of the second isolation module 160, the second isolation module 160 in the conductive state can be supplied second
Piezoelectric voltage is output to the second power supply module 170.Second power supply module 170 works normally under the action of the second supply voltage, and
The voltage signal conversion target supply voltage that power factor correction module 130 exports is exported to backlight, so that backlight is sent out
It is bright.
The technical solution of the present embodiment realizes after the conducting of the first isolation module, and first control sequential control module is completed
Then initialization controls the conducting of the second isolation module again, so that the second supply voltage of the first power supply module output can lead to
It crosses the first isolation module and the second isolation module in the conductive state and is transferred to the second power supply module as the second power supply module
Starting voltage.After the work of the second power supply module, the voltage signal that power factor correction module exports can be converted to backlight
The target voltage signal in source, to avoid and be completed initially due to the second power supply module in time-sequence control module for backlight power supply
Screen flash or the problems such as blank screen caused by first being started before changing.
Embodiment two
Fig. 2 is a kind of structural block diagram for the control circuit of backlight that the utility model embodiment two provides, wherein with it is upper
State that embodiment is identical or the explanation of corresponding term details are not described herein.As shown in Fig. 2, the control circuit of the backlight includes:
First power supply module 210, the first isolation module 220, power factor correction module 230, supply voltage control module 240, timing
Control module 250, the second isolation module 260 and the second power supply module 270, electromagnetic interference suppression module 280, filter module 290.
Wherein,
Electromagnetic interference suppression module 280 is connected between alternating current output end and 230 pieces of PFC mould, for pair
Common mode interference signal in control circuit and DM EMI signal inhibit, and treated that ac voltage signal is whole by AF panel
Stream is d. c. voltage signal.Filter module 290 is connected between power factor correction module 230 and the first power supply module 210,
For to power factor correction module, treated that voltage signal is filtered.
In the present embodiment, electromagnetic interference suppression module can be electromagnetic interference (Electro
MagneticInterference, EMI) suppression circuit.Filter module is high-voltage electrolytic capacitor, and electric main is whole through EMI circuit
After stream and high-voltage electrolytic capacitor filtering, steady dc voltage about 325V can be obtained.The voltage passes through power factor correction module
390V is obtained after being boosted, while providing electric energy to the first power supply module and the second power supply module.
In the present embodiment, the first isolation module 220 includes the first optocoupler 221 and first switch unit 222.Wherein, first
The control terminal of switch unit 222 is connected with mainboard, for receiving the first control voltage of mainboard transmission.First switch unit 222
Input terminal be connected with the cathode of the first diode inside the first optocoupler, the anode of first diode and the first power supply module
First output end is connected.The second output terminal phase of the collector of the first triode inside first optocoupler and the first power supply module
Even, for receiving the second supply voltage, the emitter of the first triode inside the first optocoupler is connected with the second isolation module.
Specifically, as shown in Fig. 2, the first power supply module exports 12V voltage to main board power supply, and mainboard has after alternating current opens
After power supply, output the first control voltage control first switch unit conducting, thus the first diode inside the first optocoupler of control
Conducting, so that first diode shines, to control the first triode ON inside the first optocoupler, in this way, the first power supply module
Second output terminal then can provide supply voltage for power factor correction module, make its normal work.
In the present embodiment, the second isolation module 260 includes: the second optocoupler 261 and second switch unit 262, wherein second
The control terminal of switch unit 262 is connected with the output end of time-sequence control module 250, for receiving the second control voltage；Second opens
The collector for closing unit 262 is connected with the cathode of the second diode inside the second optocoupler 261；Inside second optocoupler 261
The collector of two triodes is connected with the emitter of the first triode inside the first optocoupler 221；Inside second optocoupler 261
The emitter of two triodes is connected with the second power supply module 270.
Further, in the present embodiment, time-sequence control module 250 includes: constant-current control unit 251 and microcontroller chip 252；
Wherein, constant-current control unit 251 and microcontroller chip 252, are connected with supply voltage control module 240 respectively, for receiving power supply
The supply voltage that voltage control module 240 provides.The control of the first output end and second switch unit 262 of microcontroller chip 252
End is connected, and the second output terminal of microcontroller chip 252 is connected with constant-current control unit 251.The output end of constant-current control unit 251 with
Backlight is connected, for controlling the constant current hold of backlight under the control of microcontroller chip 252.
Specifically, supply voltage control module receives the first control voltage of mainboard, and exports third after mainboard powers on
Supply voltage is that current constant control chip and microcontroller chip are powered.After microcontroller chip is completed to initialize, high level control letter is sent
Number, i.e., the second control voltage in the present embodiment gives second switch unit, to control the conducting of second switch unit, so that the
The second diode inside two optocouplers is also switched on, the second LED lighting, so that the second triode inside the second optocoupler is led
It is logical, thus the second supply voltage that the first power supply module is exported by the first optocoupler and the second optocoupler in the conductive state to
Second power supply module power supply, so that the second power supply module works normally.Second power supply module under the action of the second supply voltage,
The voltage signal that power factor correction module can be exported converts target supply voltage, the i.e. supply voltage of backlight, thus
So that backlight shines.And constant-current control unit will form current closed-loop, to keep the electric current of backlight constant.
Further, in the present embodiment, control circuit further includes third switch unit Q3, be connected to the second isolation module and
Between second power supply module.Wherein, the transmitting of the control terminal of third switch unit Q3 and the second triode inside the second optocoupler
Extremely it is connected；The input terminal of third switch unit Q3 is connected with the collector of the second triode inside the second optocoupler；Third switch
The output end of unit Q3 is connected with the second power supply module.When the second triode is in the conductive state, third switching means conductive,
To provide the second supply voltage for the second power supply module.
Further, control circuit provided in this embodiment further include: rectifier diode, filter capacitor, the first partial pressure electricity
Resistance and the second divider resistance.Wherein, rectifier diode is connected by the first divider resistance with the control terminal of second switch unit；The
Two divider resistances are connected in parallel between the control terminal and output end of second switch unit；Filter capacitor is connected in parallel on the second divider resistance two
End.
Further, the emitter of the second triode inside the second optocoupler passes through current-limiting resistance and third switch unit
Control terminal is connected.Third divider resistance and zener diode have been arranged in parallel between the control terminal and ground of third switch unit.
Specifically, the circuit that Fig. 3 is a kind of microcontroller chip control power supply mode that the utility model embodiment two provides shows
It is intended to, as shown in figure 3, exporting high level signal after microcontroller chip (MCU) completes initialization, which passes through rectifier diode
It after D1 rectification, divides by the first divider resistance R1 and the second divider resistance R2, after filter capacitor C1 filtering processing, is opened to second
It closes unit 262 and conducting voltage is provided, which is generally 0.6V, so that second switch unit 262 is in saturation conduction shape
State, so that 2 feet of the second optocoupler 261 be dragged down, the 12V voltage for inputting 1 foot of the second optocoupler 261 at this time first passes through current-limiting resistance
R4 current limliting to the second optocoupler 261 1 foot, then through the second light emitting diode inside the second optocoupler 261 to ground.Second luminous two
Pole pipe is coupled to the second triode inside the second optocoupler 261, so that the second triode saturation conduction.It is defeated from the first power supply module
The second supply voltage out passes through diode D2 to the collector of third switch unit and the 4th foot of the second optocoupler, due to second
The second triode inside optocoupler 261 is in the conductive state, then 4 foot voltages are transferred to 3 feet of the second optocoupler 261, the voltage
By current-limiting resistance R5, using third divider resistance R3 and zener diode D3, base current is provided to third switch unit,
So that third switching means conductive works, supply voltage is provided to the second power supply module, so that the second power supply module works normally,
Output target supplies voltage to backlight power supply.
The present embodiment controls the second power supply mould powered to backlight using microcontroller chip on the basis of above-mentioned implementation
The supply voltage of block, so that second power supply module works again after the completion of microcontroller chip initializes, so as to avoid screen
The problem of sudden strain of a muscle or blank screen.In addition, control circuit provided in this embodiment is simple, performance issue, is easy debugging and cost is relatively low.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of control circuit of backlight is applied in display terminal, the display terminal has backlight, and feature exists
In the control circuit includes:
First power supply module supplies voltage to mainboard for exporting first after display terminal powers on；
First isolation module is connected by the mainboard with first power supply module, for receiving the mainboard described
The the first control voltage exported under the action of one supply voltage, and be connected under the action of the first control voltage, by institute
The second supply voltage for stating the output of the first power supply module is exported to power factor correction module；
The input terminal of the power factor correction module connects alternating current output end, under the action of second supply voltage
Voltage signal is provided for first power supply module and the second power supply module；
Supply voltage control module is connected with the mainboard, for according to the first control voltage output third supply voltage；
Time-sequence control module is connected with the supply voltage control module, for complete under the action of the third supply voltage
After initialization, the second control voltage is generated to the second isolation module；
Second isolation module is respectively connected with the time-sequence control module and first isolation module, for described second
Control voltage under the action of be connected, by second supply voltage by the first isolation module in the conductive state export to
Second power supply module；
Second power supply module is respectively connected with the power factor correction module and second isolation module, for described
Under the action of second supply voltage, the voltage signal conversion target supply voltage that the power factor correction module is exported is exported
To the backlight.
2. control circuit according to claim 1, which is characterized in that first isolation module includes the first optocoupler and the
One switch unit；Wherein,
The control terminal of the first switch unit is connected with the mainboard, for receiving the first control voltage of mainboard transmission；
The input terminal of the first switch unit is connected with the cathode of the first diode inside first optocoupler, and described first
The anode of diode is connected with the first output end of first power supply module；
The collector of the first triode inside first optocoupler is connected with the second output terminal of first power supply module, uses
In reception second supply voltage；The emitter of the first triode inside first optocoupler and second isolation module
It is connected.
3. control circuit according to claim 2, which is characterized in that second isolation module include: the second optocoupler and
Second switch unit；Wherein,
The control terminal of the second switch unit is connected with the output end of the time-sequence control module, for receiving second control
Voltage processed；
The collector of the second switch unit is connected with the cathode of the second diode inside second optocoupler；
The transmitting of the first triode inside the collector of the second triode inside second optocoupler and first optocoupler
Extremely it is connected；The emitter of the second triode inside second optocoupler is connected with second power supply module.
4. control circuit according to claim 3, which is characterized in that the control circuit further include:
Third switch unit is connected between the second isolation module and the second power supply module；
Wherein, the control terminal of third switch unit is connected with the emitter of the second triode inside second optocoupler；Third
The input terminal of switch unit is connected with the collector of the second triode inside second optocoupler；The output of third switch unit
End is connected with second power supply module；
When the second triode inside second optocoupler is in the conductive state, the third switching means conductive, for institute
It states the second power supply module and the second supply voltage is provided.
5. control circuit according to claim 4, which is characterized in that the time-sequence control module includes: current constant control list
Member and microcontroller chip；Wherein,
The constant-current control unit and the microcontroller chip are connected, for receiving respectively with the supply voltage control module
The supply voltage of supply voltage control module offer is provided；
First output end of the microcontroller chip is connected with the control terminal of the second switch unit, and the second of the microcontroller chip
Output end is connected with the constant-current control unit；
The output end of the constant-current control unit is connected with the backlight, for controlling under the control of the microcontroller chip
The constant current hold of the backlight.
6. control circuit according to claim 5, which is characterized in that the control circuit further include: rectifier diode, filter
Wave capacitor, the first divider resistance and the second divider resistance；
The rectifier diode is connected by first divider resistance with the control terminal of the second switch unit；
Second divider resistance is connected in parallel between the control terminal and output end of the second switch unit；
The filter capacitor is connected in parallel on second divider resistance both ends.
7. control circuit according to claim 6, which is characterized in that the hair of the second triode inside second optocoupler
Emitter-base bandgap grading is connected by current-limiting resistance with the control terminal of the third switch unit；
Third divider resistance and zener diode have been arranged in parallel between the control terminal and ground of the third switch unit.
8. control circuit according to claim 1, which is characterized in that the control circuit further include:
Electromagnetic interference suppression module is connected between alternating current output end and the power factor correction module, for the control
Common mode interference signal in circuit processed and DM EMI signal inhibit, and treated that ac voltage signal rectifies by AF panel
For d. c. voltage signal.
9. control circuit according to claim 8, which is characterized in that the control circuit further include:
Filter module is connected between the power factor correction module and the first power supply module, for PFC
Voltage signal after resume module is filtered.
10. a kind of display terminal, including backlight, which is characterized in that the display terminal is also included at least such as claim 1-9
The control circuit of any backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821683939.2U CN208848603U (en) | 2018-10-17 | 2018-10-17 | A kind of control circuit and display terminal of backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821683939.2U CN208848603U (en) | 2018-10-17 | 2018-10-17 | A kind of control circuit and display terminal of backlight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208848603U true CN208848603U (en) | 2019-05-10 |
Family
ID=66375656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821683939.2U Active CN208848603U (en) | 2018-10-17 | 2018-10-17 | A kind of control circuit and display terminal of backlight |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208848603U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880294A (en) * | 2019-12-10 | 2020-03-13 | 深圳创维－Rgb电子有限公司 | OLED driving power supply and electronic product |
| WO2021185150A1 (en) * | 2020-03-18 | 2021-09-23 | 海信视像科技股份有限公司 | Display apparatus and display control method |
-
2018
- 2018-10-17 CN CN201821683939.2U patent/CN208848603U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880294A (en) * | 2019-12-10 | 2020-03-13 | 深圳创维－Rgb电子有限公司 | OLED driving power supply and electronic product |
| WO2021185150A1 (en) * | 2020-03-18 | 2021-09-23 | 海信视像科技股份有限公司 | Display apparatus and display control method |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107172745B (en) | Colour temperature Automatic adjustment method, device and lamp mirror | |
| CN103947137B (en) | Lighting apparatus for visible light communication, and visible light communication system using said apparatus | |
| CN106851927B (en) | A kind of multichannel light modulation toning LED drive circuit of speech recognition | |
| CN104202874B (en) | The LED drive circuit of a kind of single inductance and driving method | |
| CN102752940A (en) | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof | |
| CN208848603U (en) | A kind of control circuit and display terminal of backlight | |
| CN107426874B (en) | Dimming control power supply for LED lamp | |
| WO2015196894A1 (en) | Multi-mode led lamp string control circuit and led lamp string | |
| WO2021185150A1 (en) | Display apparatus and display control method | |
| US20110057960A1 (en) | Backlight apparatus and display apparatus including the same | |
| CN105764184A (en) | Wireless intelligent dimming switch | |
| CN104377971B (en) | A kind of flyback based on Voltage Feedback directly drives LED power circuit and television set | |
| CN103813595A (en) | Efficient power source capable of supplying electricity in constant voltage and constant current alternation mode | |
| CN104125686A (en) | Safe-isolated and full-color LED lamp circuit and dimming method | |
| CN209748853U (en) | LED lamp control circuit, lamp and lighting system | |
| CN104066237A (en) | LED driving circuit and driving method | |
| CN205987484U (en) | Backlight unit's drive circuit , backlight unit and display device | |
| CN102387625A (en) | Direct drive light-emitting diode (LED) driver | |
| CN108200689A (en) | LED illumination device light synchronization system based on alternating current voltage zero crossing | |
| CN204836707U (en) | LED drive device that wireless control can adjust luminance and mix colours | |
| CN112785971A (en) | Display device and negative-pressure step power supply circuit | |
| CN104780643B (en) | Light emitting diode circuit system with power factor correction and optimization | |
| CN202759635U (en) | Indicating lamp control circuit and television set | |
| CN201893979U (en) | High-power efficient constant-current light-emitting diode (LED) driver | |
| CN208971648U (en) | A kind of television set and multi-functional TV electromechanical source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |