CN109949753A - A kind of power supply unit of backlight - Google Patents
A kind of power supply unit of backlight Download PDFInfo
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- CN109949753A CN109949753A CN201910334635.8A CN201910334635A CN109949753A CN 109949753 A CN109949753 A CN 109949753A CN 201910334635 A CN201910334635 A CN 201910334635A CN 109949753 A CN109949753 A CN 109949753A
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Abstract
The embodiment of the invention discloses a kind of power supply units of backlight.Including boost module, control module and switch module, boost module is electrically connected with the backlight of the power supply of display device and display device respectively, for the voltage of the power supply output of display device to be adjusted to the operating voltage of the backlight of display device, control module respectively with boost module, the backlight of display device and the mainboard electrical connection of display device, backlight of the control module for subregion constant current driving display device, switch module respectively with boost module, control module, the power supply of display device and the mainboard electrical connection of display device, switch module is used to control electrifying timing sequence of the power supply to boost module and control module of display device, wherein, electrifying timing sequence of the electrifying timing sequence of boost module earlier than control module.Technical solution provided in an embodiment of the present invention can dim the backlight region of display device.
Description
Technical field
The present embodiments relate to back light model setting technology field more particularly to a kind of power supply units of backlight.
Background technique
The display panel of liquid crystal display device does not emit light itself, and therefore, in liquid crystal display device is provided with backlight module and is
It provides light source, wherein the luminance of the backlight of backlight module is the key factor for influencing display panel picture and showing.
Currently, the power supply unit of backlight cannot dim backlight subregion in most of liquid crystal display device,
That is the light emission luminance of the backlight of arbitrary region is identical.But with the raising required image quality and to display
The energy-efficient requirement of device, the power supply unit of backlight need to backlight carry out local dimming, to realize local dimming, then for
The circuit structure that backlight provides the power supply unit of power supply also will be improved accordingly.
Summary of the invention
The present invention provides a kind of power supply unit of backlight, to realize that the backlight region to display device dims.
In a first aspect, the embodiment of the invention provides a kind of power supply unit of backlight, including boost module, control module
And switch module；
Boost module is electrically connected with the backlight of the power supply of display device and display device respectively, is used for display device
Power supply output voltage be adjusted to display device backlight operating voltage；
Control module is electrically connected with the mainboard of boost module, the backlight of display device and display device respectively, control
The backlight for the backlight control signal subregion constant current driving display device that module is sent for mainboard according to display device；
Mainboard of the switch module respectively with boost module, control module, the power supply of display device and display device is electrically connected
It connects, switch module controls the power supply of display device to boosting mould for the power supplying control signal that mainboard according to display device is sent
The electrifying timing sequence of block and control module；
Wherein, electrifying timing sequence of the electrifying timing sequence of boost module earlier than control module.
Optionally, switch module includes two switch units, and each switch unit includes power input, control signal
And power output end, two switch units are respectively first switch unit and second switch unit；
The power input of the power input of first switch unit and second switch unit with the electricity of display device
Source electrical connection, the first control output end of the mainboard of the control signal and display device of first switch unit are electrically connected, and second
Second control output end of the mainboard of the control signal and display device of switch unit is electrically connected, the power supply of first switch unit
Output end is electrically connected with boost module, and the power output end of second switch unit is electrically connected with control module；
Wherein, the timing that first switch unit receives power supplying control signal is received earlier than second switch unit for automatically controlled
The timing of signal processed.
Optionally, switch unit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the first transistor and
Two-transistor；
The control terminal of the first transistor is electrically connected with the first end of the second end of first resistor and second resistance respectively, the
The first end of one transistor is electrically connected with the first end of first resistor；The control terminal of second transistor respectively with 3rd resistor
The electrical connection of the first end of two ends and the 4th resistance, the second end of second transistor are electrically connected with the second end of second resistance, the
The first end of two-transistor and the second end of the 4th resistance ground connection；The first end of first resistor is the power supply of switch unit
Input terminal, the second end of the first transistor are the output end of switch unit, and the first end of 3rd resistor is the control of switch unit
Input terminal.
Optionally, switch unit further includes first capacitor and the second capacitor；
The first end of first capacitor is electrically connected with the first end of first resistor, the second end of first capacitor and first resistor
Second end electrical connection；The first end of second capacitor is electrically connected with the first end of the 4th resistance, the second end of the second capacitor and the 4th
The second end of resistance is electrically connected.
Optionally, switch module further includes voltage regulation unit, and the power supply of the input terminal and second switch unit of voltage regulation unit is defeated
Outlet electrical connection, the output end of voltage regulation unit are electrically connected with control module.
Optionally, voltage regulation unit includes the 5th resistance, the 6th resistance, two pole of third capacitor, third transistor and pressure stabilizing
Pipe；
The control terminal of third transistor is electrically connected with the first end of the second end of the 6th resistance and zener diode respectively,
The second end of third transistor is electrically connected with the first end of the second end of the 5th resistance and the 6th resistance, third transistor
First end be electrically connected with the first end of third capacitor, the second end ground connection of the second end of third capacitor and zener diode,
The first end of 5th resistance is the input terminal of voltage regulation unit, and the first end of third transistor is the output end of voltage regulation unit.
Optionally, voltage regulation unit further includes voltage-stablizer and the 4th capacitor；
The input terminal of voltage-stablizer is electrically connected with the first end of third transistor, the ground terminal ground connection of voltage-stablizer, voltage-stablizer
Output end is electrically connected with the first end of the 4th capacitor, and the second end ground connection of the 4th capacitor, the output end of voltage-stablizer is voltage regulation unit
Output end.
Optionally, switch module further includes the 5th capacitor, the 6th capacitor, the 7th capacitor and the 7th resistance；
The first end of 7th resistance and the power electric connection of display device, the second end and first switch unit of the 7th resistance
Power input electrical connection, the power supply of the first end of the 5th capacitor and the first end of the 6th capacitor with first switch unit
Output end electrical connection, the second end of the 5th capacitor and the second end of the 6th capacitor be grounded, the first end of the 7th capacitor and the
The power output end of two switch units is electrically connected, the second end ground connection of the 7th capacitor.
Optionally, boost module includes inductance, first diode, the 8th capacitor, switching tube, the 8th resistance and control
Device；
The control terminal of switching tube is electrically connected with the first end of controller, the first end of switching tube respectively with the second end of inductance
And the anode electrical connection of first diode, the cathode of first diode are electrically connected with the first end of the 8th capacitor, the 8th capacitor
Second end ground connection, the second end of switching tube is electrically connected with the second end of the first end of the 8th resistance and controller respectively, the
The second end of eight resistance is grounded, the first end of inductance and the power electric connection of display device, the cathode of first diode and display
The backlight of device is electrically connected；The third end of controller is electrically connected with first switch unit, the 4th end of controller and control mould
Block electrical connection.
Optionally, control module includes driving unit and control unit；
The first end of control unit is electrically connected with the mainboard of display device, and the of the second end of control unit and driving unit
One end electrical connection, the power input of control unit be electrically connected with the output end of voltage regulation unit, the second end of driving unit with show
The backlight of showing device is electrically connected, and the power input of driving unit is electrically connected with the power output end of second switch unit.
The power supply unit of a kind of backlight provided in an embodiment of the present invention, by boost module first by the power supply of display device
It adjusts to the operating voltage of the backlight of display device, then, control module rezones the backlight of domain constant current driving display device
Source solves the problems, such as that backlight power supply unit in the prior art can not achieve and dims to backlight region, reached to backlight
Source region dims and avoids the effect of screen flash.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the power supply unit of backlight provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the power supply unit of another backlight provided in an embodiment of the present invention；
Fig. 3 is a kind of circuit element diagram of switch module provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of the power supply unit of backlight provided in an embodiment of the present invention.Referring to Fig. 1, the back
The power supply unit of light source includes control module 11, switch module 12 and boost module 13.Boost module 13 is filled with display respectively
The power supply 1 set and the backlight of display device 4 are electrically connected, and the voltage for exporting the power supply 1 of display device is adjusted to aobvious
The operating voltage of the backlight 4 of showing device.Control module 11 respectively with boost module 13, the backlight 4 of display device and aobvious
The mainboard 3 of showing device is electrically connected, and control module 11 is used for the backlight control signal subregion that mainboard 3 according to display device is sent
The backlight 4 of constant current driving display device.The electricity with boost module 13, control module 11, display device respectively of switch module 12
The electrical connection of the mainboard 3 of source 1 and display device, switch module 12 are used for the power supply control that mainboard 3 according to display device is sent
Signal controls electrifying timing sequence of the power supply 1 to boost module 13 and control module 11 of display device, wherein boost module 13
Electrifying timing sequence of the electrifying timing sequence earlier than control module 11.
The course of work of the power supply unit of backlight shown in FIG. 1 is as follows: the first direct current that the power supply 1 of display device exports
The mainboard 3 of voltage (such as 12V-15V) input and display device is the power supply of mainboard 3 of display device, meanwhile, switch module 12 is controlled
The timing for the second DC voltage input boost module 13 that the power supply 1 of display device processed exports is inputted earlier than the second DC voltage to be controlled
The timing that molding block 11 is powered.The power supplying control signal control display dress that the mainboard 3 according to display device of switch module 12 is sent
The power supply 1 set is the first DC voltage (example that boost module 13 inputs the power supply 1 of display device after boost module 13 powers on
Such as 24V-100V) it adjusts to the operating voltage of the backlight 4 of display device, so that the backlight 4 for display device is powered.By
Prefixed time interval, the electricity for the power supplying control signal control display device that the mainboard 3 according to display device of switch module 12 is sent
Source 1 is that control module 11 powers on, the backlight control signal that the mainboard 3 of 11 receiving and displaying device of control module is sent, and subregion is permanent
The backlight 4 of stream driving display device.
It is understood that display is filled in boost module 13 if boost module 13 powers on simultaneously with control module 11
During the second voltage that the power supply 1 set exports adjusts the operating voltage to the backlight 4 of display device, control module 11 is just
Start to drive the backlight 4 of display device to shine, the voltage at 4 both ends of backlight of display device can be dragged down, to generate display
The problem of device screen flash.However, upper timing of the electrifying timing sequence of boost module 13 earlier than control module 11, it is ensured that work as control
When 11 subregion constant current of module drives the backlight 4 of display device, backlight 4 that boost module 13 has been able to as display device
The operating voltage needed for it is provided, to avoid the problem that display device booting screen flash.
It should be noted that the time interval between 11 electrifying timing sequence of 13 electrifying timing sequence of boost module and control module, this
Field technical staff can be set according to actual conditions.In addition, being particularly shown the communication between the mainboard 3 of device and control module 11
Mode, the particular content and control module 11 for the backlight control signal that the mainboard 3 of display device is sent are believed according to backlight control
The algorithm of the brightness in each region of backlight number is calculated, those skilled in the art can be set according to actual conditions, and the application compares not
It limits.
The power supply unit of backlight provided in an embodiment of the present invention, by boost module 13 first by the power supply of display device 1
It adjusts to the operating voltage of the backlight 4 of display device, then, control module 11 rezones the back of domain constant current driving display device
Light source 4 solves the problems, such as that backlight power supply unit in the prior art can not achieve and dims to backlight region, reached to back
Source region dims and avoids the effect of screen flash.
There are many specific setting methods of above-mentioned technical proposal, is described in detail below with regard to typical case, but do not constitute
Limitation to the application.
Fig. 2 is the structural schematic diagram of the power supply unit of another backlight provided in an embodiment of the present invention.Referring to fig. 2, should
The power supply unit of backlight includes control module 11, switch module 12 and boost module 13.Control module 11 includes that driving is single
Member 111 and control unit 112.Switch module 12 includes two identical switch units and voltage regulation unit 123, this two switches
Unit is respectively first switch unit 121 and second switch unit 122.Boost module 13 include inductance L, first diode D1,
8th capacitor C8, switching tube Q4, the 8th resistance R8 and controller 131.
With continued reference to Fig. 2, the connection type of each device is as follows in the power supply unit of backlight: the control terminal of switching tube Q4 with
The first end of controller 131 is electrically connected, the first end of switching tube Q4 respectively with the second end of inductance L and first diode D1
Anode electrical connection, the cathode of first diode D1 are electrically connected with the first end of the 8th capacitor C8, the second termination of the 8th capacitor C8
Ground, the second end of switching tube Q4 are electrically connected with the second end of the first end of the 8th resistance R8 and controller 131 respectively, the 8th electricity
Hinder the second end ground connection of R8, the first end of inductance L be electrically connected with the power supply 2 of display device, the cathode of first diode D1 with show
The backlight 4 of showing device is electrically connected, and the third end of controller 131 is electrically connected with first switch unit 121, and the of controller 131
Four ends are electrically connected with the third end of driving unit 111.The power input and second switch unit of first switch unit 121
122 power input is electrically connected with the power supply of display device 2, and the control signal of first switch unit 121 and display fill
First control output end of the mainboard 3 set is electrically connected, the control signal of second switch unit 122 and the mainboard 3 of display device
The electrical connection of the second control output end, the power input of the power output end and controller 131 of first switch unit 121 is electrically connected
Connect, the power output end of second switch unit 122 respectively with the power input of driving unit 111 and voltage regulation unit 123
Input terminal electrical connection, the output end of voltage regulation unit 123 are electrically connected with the power input of control unit 112.Control unit 112
First end is electrically connected with the mainboard 3 of display device, and the second end of control unit 112 is electrically connected with the first end of driving unit 111,
The second end of driving unit 111 is electrically connected with the backlight 4 of display device.
Wherein, the timing that first switch unit 121 receives power supplying control signal is received earlier than second switch unit 122
The timing of power supplying control signal.
Illustratively, control unit 112 can be micro-control unit 112 (Microcontroller Unit, MCU), drive
Moving cell 111 can be constant-current driven chip, and the controller 131 in boost module 13 can control chip for DC-DC.Driving is single
Pass through Serial Peripheral Interface (SPI) (Serial Peripheral between the mainboard 3 of member 111, control unit 112 and display device
Interface, SPI) carry out data transmission.The received power supplying control signal of first switch unit 121 can be standby signal
STB, the received power supplying control signal of first switch unit 121 can be backlight enable signal ENA, right in the mainboard of display
Standby signal STB and backlight enable signal ENA carries out timing setting.
Illustratively, the course of work of the power supply unit of backlight described in Fig. 2 is as follows: when display device booting, showing
The second DC voltage that the power supply 2 of showing device exports is that the mainboard 3 of display device is powered, defeated after the main board work of display device
Standby signal STB out, first switch unit 121 are closed, and the first DC voltage that the power supply 2 of display device exports is opened by first
Output is powered, boost module 13 starts to controller 131 after closing unit 121 for controller 131.The mainboard 3 of display device is defeated
Out after standby signal STB prefixed time interval, backlight enable signal ENA is exported, second switch unit 122 is closed, display device
The first DC voltage that exports of power supply 2 by the driving unit 111 of output after second switch unit 122 to control module 11,
For the power supply of driving unit 111, driving unit 111 starts, meanwhile, the voltage exported from second switch unit 122 passes through pressure stabilizing list
123 output of member is powered to control unit 112 for control unit 112.Hereafter, boost module 13 works normally, and is display device
Backlight 4 provides the operating voltage needed for it, and 111 subregion constant current of driving unit drives backlight.
The power supply unit of backlight provided in an embodiment of the present invention passes through first switch unit 121 and second switch unit
The electrifying timing sequence of 122 control boost modules 1313 and control module 1111, also, be driving unit 111 by voltage regulation unit 123
Stable voltage is provided.
Based on the above technical solution, optionally, switch unit include first resistor, second resistance, 3rd resistor,
4th resistance, the first transistor and second transistor, the control terminal of the first transistor respectively with the second end of first resistor and
The first end of second resistance is electrically connected, and the first end of the first transistor is electrically connected with the first end of first resistor；Second transistor
Control terminal be electrically connected respectively with the first end of the second end of 3rd resistor and the 4th resistance, the second end of second transistor with
The second end of second resistance is electrically connected, the second end ground connection of the first end of second transistor and the 4th resistance；First electricity
The first end of resistance is the power input of switch unit, and the second end of the first transistor is the output end of switch unit, third electricity
The first end of resistance is the control signal of switch unit.
Optionally, switch unit further includes first capacitor and the second capacitor, the first end of first capacitor and first resistor
First end electrical connection, the second end of first capacitor are electrically connected with the second end of first resistor；The first end of second capacitor and the 4th
The first end of resistance is electrically connected, and the second end of the second capacitor is electrically connected with the second end of the 4th resistance.The benefit being arranged in this way exists
Influence of the clutter to circuit in the power supply 2 for eliminating display device.
Optionally, voltage regulation unit includes the 5th resistance, the 6th resistance, two pole of third capacitor, third transistor and pressure stabilizing
Pipe, the control terminal of third transistor are electrically connected with the first end of the second end of the 6th resistance and zener diode respectively, third
The second end of transistor is electrically connected with the first end of the second end of the 5th resistance and the 6th resistance, the first end of third transistor
It is electrically connected with the first end of third capacitor, the second end of third capacitor and the second end ground connection of zener diode, the 5th resistance
First end be voltage regulation unit input terminal, the first end of third transistor is the output end of voltage regulation unit.
Optionally, voltage regulation unit further includes voltage-stablizer and the 4th capacitor, and the of the input terminal of voltage-stablizer and third transistor
One end electrical connection, the ground terminal ground connection of voltage-stablizer, the output end of voltage-stablizer are electrically connected with the first end of the 4th capacitor, the 4th capacitor
Second end ground connection, the output end of voltage-stablizer is the output end of voltage regulation unit.The advantages of this arrangement are as follows further increasing steady
The stability for the voltage for pressing unit 123 to export.
In above-mentioned technical proposal there are many specific setting methods of switch module 12, typical case is carried out specifically below
It is bright, but the limitation to the application is not constituted.
Fig. 3 is a kind of circuit element diagram of switch module provided in an embodiment of the present invention.Referring to Fig. 3, switch module includes
First switch unit 121, second switch unit 122, voltage regulation unit 123, the 7th resistance, are without capacitor, the 6th capacitor C6 and
Seven capacitor C7.First switch unit 121 includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, first
Triode Q1 and the second triode Q2, first capacitor C1 and the second capacitor C2.Second switch unit 122 include the 9th resistance R9,
Tenth resistance R10, eleventh resistor R11, twelfth resistor R12, third transistor Q3 and the 4th triode, the 9th capacitor C9 and
Tenth capacitor C10.Voltage regulation unit 123 includes the 5th resistance R5, the 6th resistance R6, third transistor Q3, zener diode D2, steady
Depressor, third capacitor C3 and the 4th capacitor C4.
With continued reference to Fig. 3, each device connection relationship is as follows in switch module shown in Fig. 3: the control of the first triode Q1
End is electrically connected with the first end of the second end of first capacitor C1, the second end of first resistor R1 and second resistance R2 respectively；The
The first end of one triode Q1 is electrically connected with the first end of the first end of first resistor R1 and first capacitor C1 respectively；One or three
The second end of pole pipe Q1 is electrically connected with the first end of the first end of the 5th capacitor C5 and the 6th capacitor C6 respectively, the 5th capacitor C5
Second end and the second end of the 6th capacitor C6 be grounded；The control terminal of second triode Q2 respectively with 3rd resistor R3
The first end at two ends, the first end of the 4th resistance R4 and the second capacitor C2 is electrically connected, the first end and display of 3rd resistor R3
The mainboard 3 of device is electrically connected；The second end of second triode Q2 is electrically connected with the second end of second resistance R2；Second triode Q2
First end, the second end of the second end of the 4th resistance and the second capacitor C2 be grounded, the first end of first resistor R1 and the
The second end of seven resistance R7 is electrically connected, and the R7 first end of the 7th resistance is electrically connected with the power supply 2 of display device.
The control terminal of 5th triode Q5 respectively with the second end of the 9th capacitor C9, the second end of the 9th resistance R9 and
The first end of ten resistance R10 and the power supply 2 of display device are electrically connected；The first end of 5th triode Q5 respectively with the 9th resistance
The power supply 2 of the first end of R9, the first end of the 9th resistance R9 and display device is electrically connected；The second end of 5th triode Q5 point
It is not electrically connected with the first end of the first end of the 7th capacitor C7 and the 5th resistance R5, the second end ground connection of the 7th capacitor C7；The
The control terminal of six triode Q6 is electric with the second end of eleventh resistor R11, the first end of twelfth resistor R12 and the tenth respectively
Hold the first end electrical connection of C10, the first end of eleventh resistor R11 is electrically connected with the mainboard 3 of display device；6th triode Q6
Second end be electrically connected with the second end of the tenth resistance R10；The second of the first end of 6th triode Q6, twelfth resistor R12
The second end of end and the tenth capacitor C10 are grounded.The control terminal of the third transistor Q3 second end with the 6th resistance R6 respectively
And the first end electrical connection of zener diode D2；The second end of third transistor Q3 respectively with the second end of the 5th resistance R5 with
And the 6th resistance first end electrical connection；The first end of the third transistor Q3 first end and pressure stabilizing with third capacitor C3 respectively
The input terminal IN of device is electrically connected, second end, the second end of zener diode D2 and the ground terminal of voltage-stablizer of third capacitor C3
ADJ ground connection, the output end OUT of voltage-stablizer are electrically connected with the first end of the 4th capacitor C4, the second termination of the 4th capacitor C4
Ground.Wherein, the second end of the first triode Q1 is the first voltage output end VCC1 of switch module, the second of the 5th triode Q5
End is the second voltage output end VCC2 of switch module, and the output end OUT of voltage-stablizer is the tertiary voltage output end of switch module
VCC3。
Illustratively, the course of work of switch module described in Fig. 3 is as follows: when display device booting, display device
Power supply 2 is that the mainboard 3 of display device is powered, and after the mainboard 3 of display device works, standby signal STB is exported, through 3rd resistor R3
After the 4th resistance R4 partial pressure, the control terminal of the second triode Q2, the second triode Q2 conducting, so that the one or three pole are inputted
Pipe Q1 conducting, the power supply 2 of display device are the control of boost module by exporting after the 5th capacitor C5 and the 6th capacitor C6 filtering
Device power supply, boost module starting.After exporting standby signal STB prefixed time interval, output backlight makes the mainboard 3 of display device
Energy signal ENA, after eleventh resistor R11 and twelfth resistor R12 partial pressure, the control terminal of the 6th triode Q6 of input, the 6th
Triode Q6 conducting, and then the 7th triode Q7 is connected, the power supply of display device exports after being filtered by the 7th capacitor C7, for control
The driving unit of molding block is powered, meanwhile, it exports after voltage regulation unit 123 to the control unit of control module, is control unit
Power supply.Hereafter, boost module works normally, and provides the operating voltage needed for it, driving unit for the backlight 4 of display device
111 subregion constant currents drive backlight.
It is understood that switch module shown in Fig. 3 can both meet boost module and control in back light display device
The electrifying timing sequence of module, but performance is stable, simple circuit and cost is relatively low.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of power supply unit of backlight, which is characterized in that including boost module, control module and switch module；
The boost module is electrically connected with the backlight of the power supply of display device and the display device respectively, and being used for will be described
The voltage of the power supply output of display device is adjusted to the operating voltage of the backlight of the display device；
The control module mainboard with the boost module, the backlight of the display device and the display device respectively
Electrical connection, the backlight control signal subregion constant current that the control module is used to be sent according to the mainboard of the display device drive
The backlight of the display device；
The switch module is filled with the boost module, control module, the power supply of the display device and the display respectively
The mainboard electrical connection set, the power supplying control signal that the switch module is used to be sent according to the mainboard of the display device control institute
State electrifying timing sequence of the power supply to the boost module and the control module of display device；
Wherein, electrifying timing sequence of the electrifying timing sequence of the boost module earlier than the control module.
2. the power supply unit of backlight according to claim 1, which is characterized in that the switch module includes two switches
Unit, each switch unit include power input, control signal and power output end, two switch units
Respectively first switch unit and second switch unit；
The power input of the power input of the first switch unit and the second switch unit with the display
The power electric connection of device, the control signal of the first switch unit and the first control of the mainboard of the display device are defeated
Outlet electrical connection, the second control output end electricity of the mainboard of the control signal and display device of the second switch unit
Connection, the power output end of the first switch unit are electrically connected with the boost module, the power supply of the second switch unit
Output end is electrically connected with the control module；
Wherein, the timing that the first switch unit receives power supplying control signal receives confession earlier than the second switch unit
The timing of electric control signal.
3. the power supply unit of backlight according to claim 2, which is characterized in that the switch unit includes the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the first transistor and second transistor；
The control terminal of the first transistor first end with the second end of the first resistor and the second resistance respectively
Electrical connection, the first end of the first transistor are electrically connected with the first end of the first resistor；The control of the second transistor
End processed is electrically connected with the first end of the second end of the 3rd resistor and the 4th resistance respectively, the second transistor
Second end is electrically connected with the second end of the second resistance, and the of the first end of the second transistor and the 4th resistance
Two ends ground connection；The first end of the first resistor be the switch unit power input, the second of the first transistor
End is the output end of the switch unit, and the first end of the 3rd resistor is the control signal of the switch unit.
4. the power supply unit of backlight according to claim 3, which is characterized in that the switch unit further includes the first electricity
Hold and the second capacitor；
The first end of the first capacitor is electrically connected with the first end of the first resistor, the second end of the first capacitor and institute
State the second end electrical connection of first resistor；The first end of second capacitor is electrically connected with the first end of the 4th resistance, institute
The second end for stating the second capacitor is electrically connected with the second end of the 4th resistance.
5. the power supply unit of backlight according to claim 2, which is characterized in that the switch module further includes pressure stabilizing list
Member, the input terminal of the voltage regulation unit are electrically connected with the power output end of the second switch unit, the voltage regulation unit it is defeated
Outlet is electrically connected with the control module.
6. the power supply unit of backlight according to claim 5, which is characterized in that the voltage regulation unit includes the 5th electricity
Resistance, the 6th resistance, third capacitor, third transistor and zener diode；
The control terminal of the third transistor respectively with the second end of the 6th resistance and the zener diode first
End electrical connection, the second end of the third transistor and the second end of the 5th resistance and the first end of the 6th resistance
Electrical connection, the first end of the third transistor are electrically connected with the first end of the third capacitor, and the second of the third capacitor
The second end of end and zener diode ground connection, the first end of the 5th resistance are the input terminal of the voltage regulation unit,
The first end of the third transistor is the output end of the voltage regulation unit.
7. the power supply unit of backlight according to claim 6, which is characterized in that the voltage regulation unit further includes voltage-stablizer
With the 4th capacitor；
The input terminal of the voltage-stablizer is electrically connected with the first end of the third transistor, the ground terminal ground connection of the voltage-stablizer,
The output end of the voltage-stablizer is electrically connected with the first end of the 4th capacitor, the second end ground connection of the 4th capacitor, described
The output end of voltage-stablizer is the output end of the voltage regulation unit.
8. the power supply unit of backlight according to claim 2, which is characterized in that the switch module further includes the 5th electricity
Appearance, the 6th capacitor, the 7th capacitor and the 7th resistance；
The power electric connection of the first end of 7th resistance and the display device, the second end of the 7th resistance with it is described
The power input of first switch unit is electrically connected, and the first end of the 5th capacitor and the first end of the 6th capacitor are equal
It is electrically connected with the power output end of the first switch unit, the of the second end of the 5th capacitor and the 6th capacitor
Two ends are grounded, and the first end of the 7th capacitor is electrically connected with the power output end of the second switch unit, and the described 7th
The second end of capacitor is grounded.
9. the power supply unit of backlight according to claim 2, which is characterized in that the boost module includes inductance,
One diode, the 8th capacitor, switching tube, the 8th resistance and controller；
The control terminal of the switching tube is electrically connected with the first end of the controller, the first end of the switching tube respectively with it is described
The anode electrical connection of the second end of inductance and the first diode, the cathode of the first diode and the 8th capacitor
First end electrical connection, the 8th capacitor second end ground connection, the second end of the switching tube respectively with the 8th resistance
First end and the controller second end electrical connection, the 8th resistance second end ground connection, the first of the inductance
The power electric connection at end and the display device, the cathode of the first diode and the backlight of the display device are electrically connected
It connects；The third end of the controller is electrically connected with the first switch unit, the 4th end of the controller and the control mould
Block electrical connection.
10. the power supply unit of backlight according to claim 5, which is characterized in that the control module includes that driving is single
Member and control unit；
The first end of described control unit is electrically connected with the mainboard of the display device, the second end of described control unit with it is described
The first end of driving unit is electrically connected, and the power input of described control unit is electrically connected with the output end of the voltage regulation unit,
The second end of the driving unit is electrically connected with the backlight of the display device, the power input of the driving unit and institute
State the power output end electrical connection of second switch unit.
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| CN113112965A (en) * | 2021-04-12 | 2021-07-13 | 福州京东方光电科技有限公司 | Backlight protection circuit and display device |
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| CN109949753B (en) | 2021-06-11 |
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