CN113112965A - Backlight protection circuit and display device - Google Patents
Backlight protection circuit and display device Download PDFInfo
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- CN113112965A CN113112965A CN202110390683.6A CN202110390683A CN113112965A CN 113112965 A CN113112965 A CN 113112965A CN 202110390683 A CN202110390683 A CN 202110390683A CN 113112965 A CN113112965 A CN 113112965A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The embodiment of the invention provides a backlight source protection circuit and a display device, comprising: the protection device comprises a first power supply module and a protection module; the protection module includes: the circuit comprises a first resistor, a first field effect transistor, a second resistor and a third resistor; the first resistor is connected with the first power supply module and the backlight source, and the first resistor is connected with the source electrode of the first field effect transistor; the first end of the second resistor is connected with the first power supply module, and the second resistor is connected with the grid electrode of the first field effect transistor; the third resistor is connected with the first power supply module, and the second end of the third resistor is respectively connected with the drain electrode of the first field effect transistor and the backlight source and is grounded. In the embodiment of the invention, when the backlight source works normally, only the backlight source works, and the problem of increasing invalid power consumption can be avoided. When the backlight does not work, the source electrode and the drain electrode of the first field effect transistor are in a conducting state, the first resistor is grounded to carry out rapid discharge, and the problem of flicker caused by untimely discharge after the backlight works again is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight source protection circuit and a display device.
Background
Referring to fig. 1, a backlight circuit diagram provided by the prior art includes: power module 01, backlight 02 and voltage stabilizing module 03, wherein, power module 01 backlight 02 supplies power, and voltage stabilizing module 03 is used for guaranteeing power module 01's stability and interference immunity. The backlight circuit diagram shown in fig. 1 has the following problems that when the backlight 02 normally works, the power supply of the power supply module 01 is stopped, and the power supply of the power supply module 01 is immediately started; since the time between stopping the power supply of the power supply module 01 and immediately starting the power supply of the power supply module 01 is very short, the energy storage element C1 in the voltage stabilizing module 03 and/or the backlight 02 still have no time to release the redundant electric quantity, the power supply module 01 is started again, the capacitor bootstrap occurs, and further, when the power supply module is started again, the voltage to the backlight 02 becomes high, and further, the problem that the backlight 02 is easily damaged or the service life is shortened is caused, and the problem that the display panel flickers is caused. The circuit structure shown in fig. 1 is applied to a central control screen of an automobile, and if the central control screen flickers, a great visual influence is caused to a driver, and further, the risk of accidents is caused.
In order to solve the problems, in the prior art, the circuit diagram of the backlight source in fig. 2 is adopted, and a ground resistor R0 is arranged in parallel with the backlight source 02, so that after the power supply module 01 stops supplying power, the redundant electric quantity in the voltage stabilizing module 03 and the backlight source 02 can be rapidly released through the ground resistor R0, but the circuit diagram of the backlight source in fig. 2 has the problems that when the backlight source 02 works, the ground resistor R0 generates heat and loses, and further, the useless power consumption of the display device during working is increased; meanwhile, the ground resistance R0 is increased, so that the impedance of a load in the loop is reduced, and the working efficiency of the loop is reduced.
Disclosure of Invention
The invention provides a backlight source protection circuit, which aims to solve the problems that the existing backlight source protection circuit is easy to flicker when being shut down and started and increases useless power consumption.
The first aspect of the present invention provides a backlight protection circuit, including: the protection device comprises a first power supply module and a protection module;
the protection module includes: the circuit comprises a first resistor, a first field effect transistor, a second resistor and a third resistor;
the first end of the first resistor is respectively connected with the first power supply module and the first end of the backlight source, and the second end of the first resistor is connected with the source electrode of the first field effect transistor;
the first end of the second resistor is connected with the first power supply module, and the second end of the second resistor is connected with the grid electrode of the first field effect transistor;
the first end of the third resistor is connected with the first power supply module, and the second end of the third resistor is respectively connected with the drain electrode of the first field effect transistor and the second end of the backlight source and grounded.
Optionally, the method further comprises: a switch module; the switch module is connected with the first power supply module and the protection module; the first end of the second resistor is connected with the switch module, and the first end of the third resistor is connected with the switch module; the switch module is configured to control the first power supply module and the protection module to be disconnected or connected.
Optionally, a second power supply module is further included; the switch module includes: the fourth resistor, the first triode, the fifth resistor, the sixth resistor and the switch unit; the switching unit includes a first pole, a second pole, and a third pole; the first pole controls the second pole and the third pole to be switched on or switched off;
the second power supply module is respectively connected with the first end of the fourth resistor and the base electrode of the first triode; the second end of the fourth resistor is connected with the collector of the first triode and grounded;
an emitter of the first triode is connected with a first end of the fifth resistor, and a second end of the fifth resistor is connected with a first pole of the switch unit and a first end of the sixth resistor;
a second end of the sixth resistor is connected with a second pole of the switch unit and the first power supply module;
a third pole of the switching unit is connected to a first end of the third resistor.
Optionally, the switching unit comprises: a second field effect transistor;
the first electrode of the switch unit is a grid electrode of the second field effect transistor; the second pole of the switch unit is the source electrode of the second field effect transistor; a third pole of the switching unit is a drain of the second field effect transistor.
Optionally, the switching unit comprises: a second triode;
the first electrode of the switch unit is the base electrode of the second triode; the second pole of the switch unit is the collector of the second triode; the third pole of the switching unit is an emitter of the second triode.
Optionally, the switch module comprises: single pole single throw switch.
Optionally, the method further comprises: a voltage stabilization module;
the voltage stabilizing module comprises a plurality of capacitors connected in parallel; the first end of the capacitor is connected with the first power supply module; the second end of the capacitor is grounded.
Optionally, the method further comprises: a diode; the anode of the diode is connected with the first power supply module; and the cathode of the diode is respectively connected with the first end of the backlight source and the first end of the first resistor.
Optionally, the first and second field effect transistors comprise: a P-type field effect transistor or an N-type field effect transistor.
A second aspect of the present invention provides a display device, including the backlight protection circuit described in any one of the above; further comprising: a backlight source; the backlight source protection circuit is connected with the backlight source.
An embodiment of the present invention provides a backlight protection circuit, including: the protection device comprises a first power supply module and a protection module; the protection module includes: the circuit comprises a first resistor, a first field effect transistor, a second resistor and a third resistor; the first end of the first resistor is respectively connected with the first power supply module and the first end of the backlight source, and the second end of the first resistor is connected with the source electrode of the first field effect transistor; the first end of the second resistor is connected with the first power supply module, and the second end of the second resistor is connected with the grid electrode of the first field effect transistor; the first end of the third resistor is connected with the first power supply module, and the second end of the third resistor is respectively connected with the drain electrode of the first field effect transistor and the second end of the backlight source and grounded. In the embodiment of the invention, when the first power supply module supplies power and the backlight source normally works, the grid electrode of the first field effect transistor is connected with the first power supply module through the second resistor and is at a high potential, the source electrode and the drain electrode of the first field effect transistor are in a disconnected state, only the backlight source works, and the problem of increasing invalid power consumption is avoided. When the first power supply module is turned off and the backlight does not work, the grid electrode of the first field effect transistor is not conducted with the first power supply module and is in a grounding state, the source electrode and the drain electrode of the first field effect transistor are in a conducting state, the first resistor is grounded, and rapid discharge is carried out.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a circuit structure of a backlight according to the prior art;
FIG. 2 is a schematic circuit diagram of a backlight protection circuit in the prior art;
fig. 3 is a schematic circuit structure diagram of a first backlight protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a second backlight protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit structure diagram of a third backlight protection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, a schematic diagram of a backlight protection circuit according to an embodiment of the present invention is shown, and a first aspect of the present invention provides a backlight protection circuit, including: a first power supply module 10 and a protection module 20; the protection module 20 includes: a first resistor R1, a first field effect transistor Q1, a second resistor R2 and a third resistor R3; a first end of the first resistor R1 is connected to the first power supply module 10 and a first end of the backlight 30, respectively, and a second end of the first resistor R1 is connected to the source S1 of the first fet Q1; a first end of the second resistor R2 is connected to the first power supply module 10, and a second end of the second resistor R2 is connected to the gate G1 of the first field effect transistor Q1; a first end of the third resistor R3 is connected to the first power supply module 10, and a second end of the third resistor R3 is connected to the drain D1 of the first fet Q1 and a second end of the backlight 30, respectively, and is grounded.
In fig. 3, the first field effect transistor Q1 is a PMOS (positive channel Metal Oxide Semiconductor) transistor.
The backlight source protection circuit provided by the embodiment of the invention has the working principle that: the first power supply module 10 is turned on, the gate G1 of the first field effect transistor Q1 is connected to the first power supply module 10, and is at a high potential, the source S1 and the drain D1 of the first field effect transistor are not turned on, and the first resistor R1 does not consume power; the backlight 30 is turned on to emit normal light. When the first power supply module 10 is turned off, the backlight source 30 does not operate, the gate G1 of the first field effect transistor Q1 is grounded, the source S1 and the drain D1 of the first field effect transistor are turned on, the first resistor R1 is grounded, and the excessive electric quantity in the backlight source 20 and the voltage stabilizing module 50 starts to be quickly released.
In addition, the first resistor R1 plays a role of current limiting, and the second resistor R2 and the third resistor R3 play a role of current limiting and voltage dividing.
In the embodiment of the present invention, referring to fig. 3 and 4, further including: a switch module 40; the switch module 40 connects the first power supply module 10 and the protection module 20; wherein a first terminal of the second resistor R2 is connected to the switch module 40, and a first terminal of the third resistor R3 is connected to the switch module 40; the switching module 40 is configured to control the first power supply module 10 and the protection module 20 to be disconnected or connected.
Specifically, when the backlight 30 is in operation and the first power supply module 10 is turned on; the switch module 40 is turned on, and the high potential of the first field effect transistor Q1 is cut off; when the backlight 30 is not operated and the first power supply module 10 is turned off, the switch module 40 is turned off, and the gate G1 of the first field effect transistor Q1 is grounded.
In the embodiment of the present invention, the first field effect transistor Q1 may also be an NMOS transistor, which is turned on at a high potential and turned off at a low potential; the first field effect transistor Q1 is controlled to be turned off when the backlight 30 normally operates, and the first field effect transistor Q1 is controlled to be turned on when the backlight 30 does not operate.
When the first field effect transistor Q1 is an NMOS transistor, a switch circuit for turning on and off the first field effect transistor Q1 may be added to the circuit, and will not be described herein again.
Referring to fig. 4 and 5, a second power supply module 60 is further included; the switch module 40 includes: a fourth resistor R4, a first triode T1, a fifth resistor R5, a sixth resistor R6 and a switch unit 41; the switching unit 41 includes a first pole 411, a second pole 412, and a third pole 413; the first pole 411 controls the second pole 412 and the third pole 413 to be turned on or off; the second power supply module 60 is respectively connected to a first end of the fourth resistor R4 and the base b1 of the first transistor T1; a second end of the fourth resistor R4 is connected to the collector e1 of the first transistor T1 and is grounded; an emitter c1 of the first transistor T1 is connected to a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is connected to the first pole 411 of the switching unit 41 and a first end of the sixth resistor R6; a second end of the sixth resistor R6 is connected to the second pole 412 of the switch unit 41 and the first power supply module 10; a third pole 413 of the switching unit 41 is connected to a first end of the third resistor R3.
In the embodiment of the present invention, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 function as current limiting and voltage dividing, and together with the first transistor T1 and the switch unit 41, function as a switch circuit, so as to control the on/off of the protection circuit more efficiently.
The backlight 30 includes: a plurality of LED (light emitting diode) lamps; the first power supply module 10 generates a driving voltage and a current from a driving chip (IC) such as an LED, and provides the driving voltage and the current to the LED lamp. In addition, the second power supply module 60 provides a voltage of 3.3V to the first transistor T1, and the second power supply module 60 provides a voltage of 3.3V when operating normally and provides a voltage of 0V when being turned off.
Referring to fig. 4, the switching unit 41 includes: a second field effect transistor Q2; the first pole 411 of the switch unit 41 is the gate G2 of the second field effect transistor Q2; the second pole 412 of the switch unit 41 is the source S2 of the second field effect transistor Q2; the third pole 413 of the switch unit 41 is the drain D2 of the second FET Q3.
The working principle of fig. 4 is as follows: when the backlight source 30 works, the first power supply module 10 is turned on, and the capacitor C in the voltage stabilizing module 50 is charged; the second power supply module 60 is turned on, the first transistor T1 is turned on, the emitter c1 of the first transistor T1 is grounded, the gate G2 of the second field effect transistor Q2 (here, Q2 is a PMos transistor) is grounded, the second field effect transistor Q2 is turned on, the high potential of the gate G1 of the first field effect transistor Q1 is turned off, and the first resistor R1 does not consume power.
When the backlight 30 is turned off, the first power supply module 10 is turned off, the second power supply module 60 is also turned off, and after the second power supply module 60 is turned off, the first transistor T1 is not turned on, because the capacitor C1 in the voltage stabilizing module 50 discharges in a short time when the first power supply module 10 is turned off, the high potential of the gate G2 of the second field effect transistor Q2 is turned off, the gate G1 of the first field effect transistor Q1 is grounded, and the first resistor R1 is grounded, so that the redundant electric quantity in the voltage stabilizing module 50 and the backlight 30 is quickly released.
In the embodiment of the present invention, only the first power supply module 10 and the second power supply module 20 need to be controlled to be turned on simultaneously, the backlight source works and is turned off simultaneously, and the backlight source is turned off, so that the control is convenient, and the working efficiency of the backlight source is improved.
Referring to fig. 5, the switching unit 41 includes: a second transistor T2; the first pole 411 of the switch unit 41 is the base b2 of the second transistor T2; the second pole 412 of the switch unit 41 is the collector e2 of the second transistor T2; the third pole 413 of the switching unit 41 is the emitter c2 of the second transistor T2.
In the embodiment of the present invention, when the switch unit 41 is the second triode T2, the operation principle of fig. 5 is as follows: when the backlight source 30 works, the first power supply module 10 is turned on, and the capacitor C in the voltage stabilizing module 50 is charged; the second power supply module 60 is turned on, the first transistor T1 is turned on, the emitter c1 of the first transistor T1 is grounded, the base b2 of the second transistor T2 is grounded and turned on, the gate G1 of the first field effect transistor Q1 is turned off at a high potential, and the first resistor R1 does not consume power.
When the backlight 30 is turned off, the first power supply module 10 is turned off, the second power supply module 60 is also turned off, and after the second power supply module 60 is turned off, the first transistor T1 is not turned on, because the capacitor C1 in the voltage stabilizing module 50 discharges in a short time when the first power supply module 10 is turned off, the high potential of the base b2 of the second transistor T2 is turned on, the gate G1 of the first field effect transistor Q1 is grounded and is turned on, the first resistor R1 is grounded, and redundant electric quantity in the voltage stabilizing module 50 and the backlight 30 is rapidly released.
In the embodiment of the invention, the first transistor T1 is an NPN transistor, and the second transistor T2 is a PNP transistor.
Referring to fig. 3, the switch module 40 includes: single pole single throw switch K1. In the embodiment of the present invention, the switch module 40 may also be a relay switch or other switches, which are not limited herein.
In the embodiment of the present invention, the operation principle of fig. 3 is as follows: the first power supply module 10 is turned on, the single-pole single-throw switch K1 is turned on, the gate G1 of the first field effect transistor Q1 is connected to the first power supply module 10, and if the potential is high, the source S1 and the drain D1 of the first field effect transistor are not turned on, and the first resistor R1 does not consume power; the backlight 30 is turned on to emit normal light. The first power supply module 10 is turned off, the single-pole single-throw switch K1 is turned off, the backlight source 30 does not work, the gate G1 of the first field effect transistor Q1 is grounded, the source S1 and the drain D1 of the first field effect transistor are turned on, the first resistor R1 is grounded, and the redundant electric quantity in the backlight source 20 and the voltage stabilizing module 50 starts to be quickly released.
Referring to fig. 3 to 5, further comprising: a voltage stabilization module 50; the voltage stabilizing module 50 comprises a plurality of capacitors C1 connected in parallel; a first end of the capacitor C1 is connected to the first power supply module 10; the second terminal of the capacitor C1 is connected to ground.
The voltage stabilizing module 50 includes a plurality of capacitors C1 connected in parallel, and the second backlight protection circuit can perform voltage stabilizing and filtering functions.
Wherein, still include: a diode D1; the anode of the diode D1 is connected to the first power supply module 10; the cathode of the diode D1 is connected to the first end of the backlight 30 and the first end of the first resistor R1, respectively.
In the embodiment of the present invention, the diode D1 has unidirectional conductivity and can only conduct in one direction, so as to prevent the current from flowing back after the first power module 10 is turned off.
Further, the first and second field effect transistors include: a P-type field effect transistor or an N-type field effect transistor.
In the diagrams shown in fig. 3 to 5, the first field effect transistor and the second field effect transistor are both PMos transistors, the first transistor T1 is an NPN transistor, and the second transistor T2 is a PNP transistor. In the actual use process, the first field effect transistor and the second field effect transistor can be NMos transistors; the first triode may also be an NPN type triode, and the second triode T1 may also be a PNP type transistor, which may be specifically selected as needed and will not be described herein again.
The embodiment of the invention also provides a display device, which comprises the backlight source protection circuit; further comprising: a backlight source; the backlight source protection circuit is connected with the backlight source.
The display device provided by the embodiment of the invention can be used in vehicle-mounted display equipment and other novel intelligent display products, and has universality in application.
An embodiment of the present invention provides a backlight protection circuit, including: the protection device comprises a first power supply module and a protection module; the protection module includes: the circuit comprises a first resistor, a first field effect transistor, a second resistor and a third resistor; the first end of the first resistor is respectively connected with the first power supply module and the first end of the backlight source, and the second end of the first resistor is connected with the source electrode of the first field effect transistor; the first end of the second resistor is connected with the first power supply module, and the second end of the second resistor is connected with the grid electrode of the first field effect transistor; the first end of the third resistor is connected with the first power supply module, and the second end of the third resistor is respectively connected with the drain electrode of the first field effect transistor and the second end of the backlight source and grounded. In the embodiment of the invention, when the first power supply module supplies power and the backlight source normally works, the grid electrode of the first field effect transistor is connected with the first power supply module through the second resistor and is at a high potential, the source electrode and the drain electrode of the first field effect transistor are in a disconnected state, only the backlight source works, and the problem of increasing invalid power consumption is avoided. When the first power supply module is turned off and the backlight does not work, the grid electrode of the first field effect transistor is not conducted with the first power supply module and is in a grounding state, the source electrode and the drain electrode of the first field effect transistor are in a conducting state, the first resistor is grounded, and rapid discharge is carried out.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A backlight protection circuit, comprising: the protection device comprises a first power supply module and a protection module;
the protection module includes: the circuit comprises a first resistor, a first field effect transistor, a second resistor and a third resistor;
the first end of the first resistor is respectively connected with the first power supply module and the first end of the backlight source, and the second end of the first resistor is connected with the source electrode of the first field effect transistor;
the first end of the second resistor is connected with the first power supply module, and the second end of the second resistor is connected with the grid electrode of the first field effect transistor;
the first end of the third resistor is connected with the first power supply module, and the second end of the third resistor is respectively connected with the drain electrode of the first field effect transistor and the second end of the backlight source and grounded.
2. The backlight protection circuit according to claim 1, further comprising: a switch module; the switch module is connected with the first power supply module and the protection module; the first end of the second resistor is connected with the switch module, and the first end of the third resistor is connected with the switch module; the switch module is configured to control the first power supply module and the protection module to be disconnected or connected.
3. The backlight protection circuit of claim 2, further comprising a second power supply module; the switch module includes: the fourth resistor, the first triode, the fifth resistor, the sixth resistor and the switch unit; the switching unit includes a first pole, a second pole, and a third pole; the first pole controls the second pole and the third pole to be switched on or switched off;
the second power supply module is respectively connected with the first end of the fourth resistor and the base electrode of the first triode; the second end of the fourth resistor is connected with the collector of the first triode and grounded;
an emitter of the first triode is connected with a first end of the fifth resistor, and a second end of the fifth resistor is connected with a first pole of the switch unit and a first end of the sixth resistor;
a second end of the sixth resistor is connected with a second pole of the switch unit and the first power supply module;
a third pole of the switching unit is connected to a first end of the third resistor.
4. The backlight protection circuit according to claim 3, wherein the switching unit includes: a second field effect transistor;
the first electrode of the switch unit is a grid electrode of the second field effect transistor; the second pole of the switch unit is the source electrode of the second field effect transistor; a third pole of the switching unit is a drain of the second field effect transistor.
5. The backlight protection circuit according to claim 3, wherein the switching unit includes: a second triode;
the first electrode of the switch unit is the base electrode of the second triode; the second pole of the switch unit is the collector of the second triode; the third pole of the switching unit is an emitter of the second triode.
6. The backlight protection circuit of claim 2, wherein the switch module comprises: single pole single throw switch.
7. The backlight protection circuit according to claim 1, further comprising: a voltage stabilization module;
the voltage stabilizing module comprises a plurality of capacitors connected in parallel; the first end of the capacitor is connected with the first power supply module; the second end of the capacitor is grounded.
8. The backlight protection circuit according to claim 1, further comprising: a diode; the anode of the diode is connected with the first power supply module; and the cathode of the diode is respectively connected with the first end of the backlight source and the first end of the first resistor.
9. The backlight protection circuit of claim 4, wherein the first and second field effect transistors comprise: a P-type field effect transistor or an N-type field effect transistor.
10. A display device comprising the backlight protection circuit according to any one of claims 1 to 9; further comprising: a backlight source; the backlight source protection circuit is connected with the backlight source.
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| CN113112965B (en) | 2022-09-30 |
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