CN207572047U - Lcd screen backlight power supply control circuit and receiver - Google Patents
Lcd screen backlight power supply control circuit and receiver Download PDFInfo
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- CN207572047U CN207572047U CN201721377893.7U CN201721377893U CN207572047U CN 207572047 U CN207572047 U CN 207572047U CN 201721377893 U CN201721377893 U CN 201721377893U CN 207572047 U CN207572047 U CN 207572047U
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- lcd screen
- backlight
- discharge
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Abstract
The utility model discloses LCD screen backlight power supply control circuit.The circuit includes System self-test circuit, controller, discharge circuit and the backlight switch circuit including switch.Whether each circuit power supply module of the System self-test checking system for PCB works normally, and sends self-detection result to the controller.The controller receives the self-detection result, and in the case where self-detection result is invalid, the electric discharge trigger signal of controller output is effective；Effective in self-detection result, the electric discharge trigger signal of output is invalid.The discharge circuit is effective in electric discharge trigger signal, discharges the charge on the charge in place circuit of the backlight switch circuit and/or the backlight module of LCD screen.The circuit of the utility model can prevent LCD screen from occurring the white screen phenomenon of moment in switching on and shutting down.
Description
Technical field
The utility model is related to LCD screen display field more particularly to LCD screen backlight power supply control circuit and with the back of the body
The receiver of optical functions control circuit, the start-up circuit can prevent LCD screen from occurring moment white screen phenomenon in booting or shutdown.
Background technology
Existing LCD screen includes backlight module and backlight power supply control circuit.When LCD screen booting powers on, in the backlight of LCD
Remaining charge when may have last time shutdown in module, then since each power module of system starts temporal difference, cause each
Level voltage normal work has the difference in sequential to fall, and LCD screen may be caused to show that signal lags behind beating for backlight in start process
It opens, the phenomenon that LCD display just will appear moment white screen as a result,.
Invention content
The utility model solves the problems, such as it is the problem of existing LCD screen will appear moment white screen phenomenon on startup.
To solve the above problems, the utility model provides a kind of LCD screen backlight power supply control circuit.The backlight power supply controls
Circuit includes System self-test circuit, controller, electric discharge driving circuit and the backlight switch circuit including switch.The System self-test
Whether start completion works normally each power module of system where circuit detection LCD screen, then sends self-detection result and extremely controls
Device.The controller receives self-test as a result, in the case where self-detection result is invalid, and the electric discharge trigger signal of output is effective and defeated
Go out invalid backlight control signal and do not export display signal；It is effective in self-detection result, the electric discharge triggering letter of output
It is number invalid, and export backlight control signal effectively and display signal；The self-detection result includes process of self-test in vain to be completed and has
The abnormal or process of self-test of power supply module work does not complete, and the self-detection result, which effectively includes process of self-test, to be completed and respectively power
Module works normally.The discharge circuit is effective in electric discharge trigger signal, discharges the backlight switch circuit place
The charge in circuit, in the case where electric discharge trigger signal is invalid, the charge in circuit where not discharging backlight switch circuit.The back of the body
Light commutation circuit is connected in the case that backlight control signal is effective, is powered to the backlight module of LCD screen, in backlight control signal
It turns off, does not power to the backlight module of LCD screen in the case of invalid.
In addition, a kind of receiver is also disclosed in the utility model.The receiver includes LCD screen and LCD described in the utility model
Shield backlight control circuit.Receiver how is shown and be assemblied in as LCD screen, the prior art may be used, and is repeated no more.
Compared with prior art, the utility model has at least the following advantages：
The utility model in self-detection result, (complete and have the abnormal or self-test of power supply module work in vain by process of self-test
Journey does not complete) in the case of, all in discharge condition on the backlight module of LCD screen and the circuit of LCD screen backlight module, only exist
In the case of self-detection result effectively (process of self-test is completed and each power supply module works normally), LCD screen backlight module and place are returned
The charge on road is not just discharged and backlight control signal and display signal are exported, in this way, avoiding when powering on booting, due to upper
Residual charge causes LCD screen moment the phenomenon that white screen occur in the difference of electric sequential and LCD backlight module.
Description of the drawings
Fig. 1 is the schematic diagram of the utility model LCD screen backlight power supply control circuit；
Fig. 2 is the circuit diagram of self-checking circuit in Fig. 1；
Fig. 3 is the circuit diagram of discharge circuit in Fig. 1；
Fig. 4 is the circuit diagram of backlight switch circuit in Fig. 1.
Specific embodiment
For technology contents, construction feature, institute's reached purpose and effect of the utility model is described in detail, below in conjunction with reality
It applies example and attached drawing is coordinated to be described in detail.
It please refers to Fig.1 to Fig.4, the utility model LCD screen backlight power supply control circuit includes System self-test circuit 1, control
Device 2, discharge circuit 3 and the backlight switch circuit 4 including switch.System is each where the System self-test circuit 1 detects LCD screen
Whether start completion works normally power module, also postpones preset time by the voltage output of overall system power.The system is certainly
It examines circuit 1 and includes detection circuit 11 and delay circuit 12.Detection circuit 11 detect each power module whether the normal work of start completion
Make (include whether power on completion and whether working properly), Fig. 2 illustrates output 3V_PG, 5v power module of 3v power modules
Output 5V_PG and 12v power modules output 12_PG, other power modules do not illustrate.In the situation for including delay circuit 12
Under, the self-detection result effectively include process of self-test complete and have the abnormal, process of self-test of power supply module work do not complete or
Delay time is not up to preset time, and the electric discharge trigger signal includes process of self-test completion and the normal work of each power supply module in vain
Make and delay time reach preset time, that is to say, that power on completion and each power module is working properly and delay time reaches
In the case of preset time, signal pwrok is just effective, as long as there is one of them to be unsatisfactory for condition, signal pwrok is invalid, letter
Single, those skilled in the art can be interpreted as the System self-test circuit 1 and door.Detection circuit 11 and delay circuit 12 all may be used
To be realized using circuit of the prior art or chip, it is not limited.The delay time 20ms of the delay circuit 12~
100ms.The controller 2 in self-detection result effectively in the case of (signal pwrok is effective), output electric discharge trigger signal is invalid,
Backlight control signal effectively and display signal output, and then, moment will not occur white screen phenomenon, backlight control signal effectively and
In the case of having display signal output, LCD screen can show information；In the case of self-detection result invalid (signal pwrok is invalid),
Output electric discharge trigger signal is effectively and backlight control signal is invalid, does not export display signal also.Backlight control signal in vain and
In the case of not exporting display signal, LCD screen does not show any information.
Please refer to Fig. 3 and with reference to Fig. 1, the discharge circuit 3 is effective in electric discharge trigger signal, discharges the back of the body
Charge on the backlight module of 4 place circuit of light commutation circuit and LCD screen in the case where electric discharge trigger signal is invalid, is not released
The charge on the backlight module of 4 place circuit of backlight switch circuit and LCD screen is put, is discharged including electric discharge driving circuit 31, first
32 and second discharge circuit 33 of circuit.The electric discharge driving circuit 31 is effective in electric discharge trigger signal slp_s3, to
First discharge circuit 32 and the discharge control signal of the second discharge circuit 33 output are effective, in the invalid situation of electric discharge trigger signal
Under, the discharge control signal exported to the first discharge circuit 32 and the second discharge circuit 33 is invalid.First discharge circuit 32
Discharge the charge on 4 place circuit of backlight switch circuit.Charge on the backlight module of second discharge circuit 33 release LCD screen.
In one embodiment, the electric discharge driving circuit 31 includes the first metal-oxide-semiconductor Q4 and first resistor R8.First metal-oxide-semiconductor
(NMOS) grid of Q4 connects the controller 2, and drain often has power supply VCC_SBY by connecing first resistor R8 connections, and source electrode connects
Ground.Often there is power supply to have electricity always.First discharge circuit 32 is effective in the discharge control signal, described in release
Charge on 4 place circuit of backlight switch circuit, in the case where discharge control signal is invalid, discharge circuit is invalid and reaches section
Save the effect of electric energy.In one embodiment, first discharge circuit 32 includes the electricity of the second metal-oxide-semiconductor (NMOS) Q5 and second
R9 is hindered, wherein, the output terminal of the grid connection electric discharge driving circuit 31 of the second metal-oxide-semiconductor Q5, drain D passes through second resistance R9
Connect 12v power supplys VCC (power supply of backlight module), source S connection ground.Second discharge circuit 33 is in electric discharge driving circuit 31
In the case of the discharge control signal of output is effective, the charge in the LCD screen backlight electric power module of driving is discharged；It is driven in electric discharge
In the case that discharge control signal that circuit 31 exports is invalid, the second discharge circuit 33 is invalid and has the function that save electric energy.
In one embodiment, second discharge circuit 33 includes third metal-oxide-semiconductor Q6 and 3rd resistor R10, wherein, the 3rd MOS
The output terminal of the grid connection electric discharge driving circuit 31 of pipe Q6, drain electrode are connect by 3rd resistor R9 connection power supply VCC_LCD, source electrode
Ground.
It please refers to Fig.1 and Fig. 4, the backlight switch circuit 4 includes booster circuit 41 and switch 42.The booster circuit 41
Effective in backlight control signal, output voltage control signal is effective, in the invalid feelings of the backlight control signal of output
Under condition, output voltage control signal is invalid.In a kind of specific embodiment, the booster circuit 41 include the 4th resistance R1,
5th resistance R2 and NPN triode Q1.The 4th resistance R1 is connected to the output terminal and NPN triode Q1 of the controller 2
Base stage.The emitter ground connection of the NPN triode Q1.The collector connection switch 42 of NPN triode simultaneously passes through described
5th resistance R2 connection power supplys VCC_12V.The switch 42 is in effective be connected of voltage control signal and to LCD screen
Backlight module is powered (being defeated by backlight module by VCC_LCD), and in the case where voltage control signal is invalid, shutdown is without to LCD
The backlight module power supply of screen.In a kind of specific embodiment, the switch 42 is metal-oxide-semiconductor, more specifically PMOS tube Q2,
The source electrode connection power supply VCC_12V of the grid connection booster circuit of the PMOS tube, drain electrode are grounded by capacitance C2.
It please refers to Fig.1 to Fig.4, the course of work of the utility model LCD screen backlight control circuit is as follows：
First, under switch on condition
1.1st, self-test and delay do not complete after being switched on：The meeting self-test of detection circuit 11 of System self-test circuit 1, it is complete in self-test
Into and each power module all work normally and in the case that the delay time of delay circuit 12 reaches preset time, System self-test electricity
The output signal pwrok on road 1 is effective, self-test does not complete, delay time is not up to preset time or self-test is completed but has an electricity
In the case of source module work is abnormal, the output signal pwrok of System self-test circuit 1 is invalid (self-detection result is invalid).Control
Device 2 is in the case where self-detection result is invalid, output electric discharge trigger signal slp_s3 effectively (namely triggering discharge process), the signal
Slp_s3 effectively (low level) is so that metal-oxide-semiconductor Q4 cut-offs, often have power supply VCC_SBY to export to the metal-oxide-semiconductor of the first discharge circuit 32
The metal-oxide-semiconductor Q6 of Q5 and the second discharge circuit 33, the grid for being equivalent to metal-oxide-semiconductor Q5 and Q6 connect high level (i.e. discharge control signal have
Effect), and then, metal-oxide-semiconductor Q5 and Q6 are switched on, and the charge in 4 place circuit of backlight switch circuit is by the metal-oxide-semiconductor of the first discharge circuit 32
Q5 and resistance R9 discharges, and the charge on the backlight module of LCD screen is discharged by the metal-oxide-semiconductor Q6 of the second discharge circuit 33 and resistance R10.
It should be added that self-test does not complete, delay time is not up to preset time or self-test is completed but has power module
Work it is abnormal in the case of, backlight control signal L-BKLTEN is invalid and controller 2 will not control output to show signal, LCD
Screen does not show information.
1.2nd, self-test completion, power module normal work and delay time reach preset time after being switched on：In such cases,
The signal pwrok that System self-test circuit 1 exports is effective.Electric discharge effective in signal pwrok, that controller 2 exports
Trigger signal slp_s3 is invalid and and output is controlled to show that signal and backlight control signal L_BKLTEN are effective.How output is controlled
Signal belongs to the prior art, and details are not described herein.In the case of electric discharge trigger signal slp_s3 invalid (high level),
NMOS tube Q4 is connected, and the grid for being equivalent to the metal-oxide-semiconductor Q5 of the first discharge circuit 32 and the metal-oxide-semiconductor Q6 of the second discharge circuit 33 is drawn
It is low for low level (discharge control signal is invalid), metal-oxide-semiconductor Q5 and Q6 end so that circuit where backlight switch circuit 4 and
The backlight module of LCD screen has the required 12v voltages of normal work, that is, not to 4 place circuit of backlight switch circuit and the back of the body
Optical module discharges.It is effective in backlight control signal L-BKLTEN, triode Q1 conductings, and then, switch the grid of Q2
Low level (namely voltage control signal is effective) is pulled to, which to switch Q2 conductings, power supply VCC and VCC_LCD structure
It powers into circuit to the backlight module of LCD screen.In the case where backlight control signal L_BKLTEN is invalid, triode Q1 cut-offs,
The grid and source electrode for switching Q2 are all 12v, so, switch Q2 cut-offs will not power to the backlight module of LCD screen.
2nd, the situation of shutdown
In the case of shutdown, controller 2 exports electric discharge trigger signal and the electric discharge trigger signal is effectively (for example, low electricity
It is flat), in such cases, the NMOS tube Q4 cut-offs of electric discharge driving circuit 31 are equivalent to the electric discharge control that electric discharge driving circuit 31 exports
Signal processed is effective, and then, the grid voltage of the NMOS tube Q5 of the first discharge circuit 32 is switched on higher than source voltage so that the back of the body
The charge in 4 place circuit of light commutation circuit is released, and in such cases, the discharge control signal is effectively so that the second discharge circuit
33 NMOS tube Q6 conductings, and then, the residual charge on the backlight module of LCD screen is released.
From the above embodiment it is known that the utility model LCD screen backlight control circuit at least has following beneficial effect
Fruit：
1. the utility model is in the case where self-detection result is invalid, the backlight module of LCD screen and returning for LCD screen backlight module
Road effectively (powers on completion, each power module normal work and delay and reaches default all in discharge condition, only self-detection result
Time) after, the backlight module of LCD screen and the charge in place circuit are not just discharged, in this way, avoid when powering on booting, by
In in the difference of each power module electrifying timing sequence of system and backlight module there may be charge to cause shield LCD screen there is moment white screen
The phenomenon that.
2. due to the utility model controller in the case of power-off, also output electric discharge trigger signal and the electric discharge trigger
Signal is effective, is triggered by the electric discharge trigger signal and causes LCD screen in the case of power-off by the backlight module of LCD screen and its institute
Residual charge in circuit discharges, so as to remaining on the backlight module of LCD screen and its place circuit when avoiding being switched on next time
Charge and even charge causes device failure etc. the phenomenon that lead to moment white screen.
3. the self-checking circuit due to the utility model includes delay circuit, when all power modules power on completion and postpone
Between reach preset time in the case of, the just effective electric discharge trigger signal of output, in this way, the mode by delay is powering on
Backlight control signal and display signal are just exported after stabilization, and then, avoid system electrification is unstable from LCD screen being caused white screen occur show
As the problem of.
Claims (13)
1.LCD screen backlight power supply control circuits, it is characterized in that：The circuit include System self-test circuit, controller, discharge circuit and
Backlight switch circuit including switch, wherein,
Whether start completion works normally each power module of system where the System self-test circuit detection LCD screen, Ran Houfa
Self-detection result is sent to controller；
The controller receives self-test as a result, in the case where self-detection result is invalid, and the electric discharge trigger signal of output is effective and defeated
Go out invalid backlight control signal and do not export display signal；It is effective in self-detection result, the electric discharge triggering letter of output
It is number invalid, and export backlight control signal effectively and display signal；The self-detection result includes process of self-test in vain to be completed and has
The abnormal or process of self-test of power supply module work does not complete, and the self-detection result, which effectively includes process of self-test, to be completed and respectively power
Module works normally；
The discharge circuit is effective in electric discharge trigger signal, the electricity in circuit where discharging the backlight switch circuit
Lotus, in the case where electric discharge trigger signal is invalid, the charge in circuit where not discharging backlight switch circuit；
The backlight switch circuit is connected in the case that backlight control signal is effective, is powered, is being carried on the back to the backlight module of LCD screen
It turns off, does not power to the backlight module of LCD screen in the case that optical control signal is invalid.
2. LCD screen backlight power supply control circuit according to claim 1, it is characterized in that：The discharge circuit includes electric discharge
Driving circuit and the first discharge circuit, wherein,
The electric discharge driving circuit is effective in electric discharge trigger signal, and the control of discharge exported to the first discharge circuit is believed
Number effectively, electric discharge trigger signal it is invalid in the case of, to the first discharge circuit export discharge control signal it is invalid；
First discharge circuit is effective in the discharge control signal, discharges the backlight switch circuit place and returns
The charge on road；In the case where discharge control signal is invalid, it is impossible to discharge.
3. LCD screen backlight power supply control circuit according to claim 2, it is characterized in that：First discharge circuit includes
Second metal-oxide-semiconductor and second resistance, wherein, the output terminal of the grid connection electric discharge driving circuit of second metal-oxide-semiconductor, source electrode connects
Ground, drain electrode connect the power supply of backlight module by second resistance.
4. LCD screen backlight power supply control circuit according to claim 1, it is characterized in that：The discharge circuit includes electric discharge
Driving circuit and the second discharge circuit, wherein,
The electric discharge driving circuit is effective in electric discharge trigger signal, and the control of discharge exported to the second discharge circuit is believed
Number effectively, electric discharge trigger signal it is invalid in the case of, to the second discharge circuit export discharge control signal it is invalid；
Second discharge circuit is effective in the discharge control signal that charge/discharge control circuit exports, and discharges driving
Charge on LCD screen backlight module；In the case where the discharge control signal of electric discharge driving circuit output is invalid, driving is not discharged
The charge on backlight module that circuit is driven.
5. LCD screen backlight power supply control circuit according to claim 4, it is characterized in that：Second discharge circuit includes
Third metal-oxide-semiconductor and 3rd resistor, wherein, the output terminal of the grid connection electric discharge driving circuit of third metal-oxide-semiconductor, drain electrode passes through third
Resistance connects power supply VCC_LCD, source electrode ground connection.
6. the LCD screen backlight power supply control circuit according to Claims 2 or 3 or 4 or 5, it is characterized in that：The electric discharge driving
Circuit includes the first metal-oxide-semiconductor and first resistor, and the grid of first metal-oxide-semiconductor connects the controller, and drain electrode passes through the first electricity
Resistance connection often has power supply, source electrode ground connection.
7. LCD screen backlight power supply control circuit according to claim 1, it is characterized in that：The backlight switch circuit includes
Booster circuit and switch, wherein,
The booster circuit is effective in backlight control signal, and the voltage control signal of output is effective, in backlight control
In the case of invalidating signal, the voltage control signal of output is invalid；
The switch is powered in effective be connected of voltage control signal to the backlight module of LCD screen, is controlled in voltage
Shutdown is without the backlight module power supply to LCD screen in the case of invalidating signal.
8. LCD screen backlight power supply control circuit according to claim 7, it is characterized in that：The switch is PMOS tube, should
The power supply of the source electrode connection backlight module of PMOS tube, drain electrode pass through capacity earth.
9. LCD screen backlight power supply control circuit according to claim 7, it is characterized in that：The booster circuit includes the 4th
Resistance, the 5th resistance and NPN triode, wherein, the 4th resistance is connected to the output terminal and NPN triode of the controller
Base stage, the NPN triode emitter ground connection, collector connection it is described switch simultaneously pass through the 5th resistance connection power supply.
10. LCD screen backlight power supply control circuit according to claim 1, it is characterized in that：The System self-test circuit includes
Detection circuit and delay circuit, wherein, whether start completion works normally each power supply module of detection circuit detecting system, delay
The voltage of circuit delay preset time and output system power supply, it is not up to default that the self-detection result further includes delay time in vain
Time；The self-detection result effectively further includes delay time and reaches preset time.
11. LCD screen backlight power supply control circuit according to claim 1, it is characterized in that：The controller is also in shutdown
In the case of output electric discharge trigger signal and the electric discharge trigger signal it is effective.
12. receiver, including LCD screen and LCD screen backlight power supply control circuit, it is characterized in that：The LCD screen backlight power supply control
Circuit is the LCD screen backlight power supply control circuit any one of claim 1 to 5 and 7 to 11.
13. receiver, including LCD screen and LCD screen backlight power supply control circuit, it is characterized in that：The backlight power supply control circuit
It is the LCD screen backlight power supply control circuit described in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721377893.7U CN207572047U (en) | 2017-10-24 | 2017-10-24 | Lcd screen backlight power supply control circuit and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721377893.7U CN207572047U (en) | 2017-10-24 | 2017-10-24 | Lcd screen backlight power supply control circuit and receiver |
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| Publication Number | Publication Date |
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| CN207572047U true CN207572047U (en) | 2018-07-03 |
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| CN201721377893.7U Active CN207572047U (en) | 2017-10-24 | 2017-10-24 | Lcd screen backlight power supply control circuit and receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113763894A (en) * | 2021-09-30 | 2021-12-07 | 深圳市皓丽软件有限公司 | Self-checking reset method and system for area light control circuit |
-
2017
- 2017-10-24 CN CN201721377893.7U patent/CN207572047U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113763894A (en) * | 2021-09-30 | 2021-12-07 | 深圳市皓丽软件有限公司 | Self-checking reset method and system for area light control circuit |
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