CN214175661U - Power supply circuit of liquid crystal display device and liquid crystal display device - Google Patents
Power supply circuit of liquid crystal display device and liquid crystal display device Download PDFInfo
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- CN214175661U CN214175661U CN202120101531.5U CN202120101531U CN214175661U CN 214175661 U CN214175661 U CN 214175661U CN 202120101531 U CN202120101531 U CN 202120101531U CN 214175661 U CN214175661 U CN 214175661U
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Abstract
The utility model discloses a liquid crystal display device's power supply circuit and liquid crystal display device, liquid crystal display device's power supply circuit includes: the detection unit is used for detecting whether the liquid crystal display device enters a shutdown state from a working state or not and generating a control signal according to a detection result; the switch unit and the first resistor are connected in series between a target node and the ground, and the target node is arranged on a line of a power supply circuit for outputting working voltage to a drive plate of the liquid crystal display device; the switch unit is connected with the detection unit to switch on and off under the control of the control signal, and the switch unit is switched to be in a conducting state when the liquid crystal display device enters a shutdown state from a working state. The utility model discloses can both reach when liquid crystal display device shuts down and accelerate the discharged purpose of drive plate, can not increase circuit load under liquid crystal display device's operating condition again.
Description
Technical Field
The utility model relates to a liquid crystal display's technical field, more specifically relates to liquid crystal display device's supply circuit and liquid crystal display device.
Background
Referring to fig. 1, a liquid crystal display device 1000 in the prior art includes a display panel 1100, a driving board 1200 and a power supply circuit 1300, wherein the driving board 1200 and the display panel 1100 are connected to provide a scanning signal G [ i ] for controlling on/off of a thin film transistor to the display panel 1100]And data signal Sj for controlling pixel unit to display gray scale]The power supply circuit 1300 is connected to the display panel 1100 to provide the backlight voltage LED _ EN to the backlight module of the display panel 1100, and the power supply circuit 130 is further connected to the driving board 1200 to provide the driving board 1200 with a plurality of operating voltages Vout。
Referring to FIG. 1, a driver board 1200 is provided with a data signal Sj]And a source driving circuit 1210 for providing a scan signal G [ i ]]If the Gate driving circuit 1220 employs a Gate Driver (Gate Driver) integrated with a Gate-Driver IN Array (GIA) or an Output ALL-ON Control (XON) function, the driving board 1200 may have a phenomenon of residual charges when the liquid crystal display device 1000 is turned off, which may cause a picture-sticking problem when the liquid crystal display device is turned off or a picture-flickering problem when the liquid crystal display device is turned ON next time. The prior art solves the problem in the following ways: an upper part position D of the ground resistor reserved at the power input end of the driving board 1200 for connecting the power supply circuit 13001D2If the residual charge problem is determined to exist, the workpiece is placed at the workpiece loading position D1D2Serially connected with a ground resistor.
In the above-described solution, when the liquid crystal display device 1000 including the ground resistance is turned off, residual electric charges in the drive board 1200 can be discharged to the ground through the ground resistance. However, the load of the power supply circuit 1300 is inevitably increased due to the resistance to ground, and therefore, it is necessary to design a new power supply circuit of the liquid crystal display device and the liquid crystal display device to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a liquid crystal display device's supply circuit and liquid crystal display device can both reach when liquid crystal display device shuts down and accelerate the purpose that the drive plate discharged, can not increase the circuit load under liquid crystal display device's operating condition again.
According to the utility model discloses an aspect provides a liquid crystal display device's supply circuit, and this supply circuit includes:
the detection unit is used for detecting whether the liquid crystal display device enters a shutdown state from a working state or not and generating a control signal according to a detection result;
the switch unit and the first resistor are connected in series between a target node and the ground, and the target node is arranged on a line of the power supply circuit for outputting working voltage to the liquid crystal display device driving plate;
the switch unit is connected with the detection unit to switch on and off under the control of the control signal, and the switch unit is switched to be in a conducting state when the liquid crystal display device enters a shutdown state from a working state.
Optionally, the detection unit includes:
the input end of the first comparison subunit receives a panel voltage and a first reference voltage respectively, and the output end of the first comparison subunit outputs a first comparison result obtained by comparing the panel voltage with the first reference voltage;
the input end of the second comparison subunit receives the backlight voltage and a second reference voltage respectively, and the output end of the second comparison subunit outputs a second comparison result obtained by comparing the backlight voltage with the second reference voltage;
and an input end of the shutdown judging subunit is connected with an output end of the first comparing subunit and an output end of the second comparing subunit respectively, so as to generate the control signal according to the first comparing result and the second comparing result.
Optionally, the first comparing subunit includes a first comparator and a first inverter, wherein a non-inverting input terminal of the first comparator receives the panel voltage and an inverting input terminal of the first comparator receives the first reference voltage, and an input terminal of the first inverter is connected to an output terminal of the first comparator;
the second comparison subunit comprises a second comparator and a second inverter, wherein the non-inverting input terminal of the second comparator receives the backlight voltage and the inverting input terminal of the second comparator receives the second reference voltage, and the input terminal of the second inverter is connected with the output terminal of the second comparator;
the shutdown judging subunit comprises an and gate, an input end of the and gate is respectively connected with an output end of the first phase inverter and an output end of the second phase inverter, and an output end of the and gate outputs the control signal.
Optionally, the first comparator subunit further includes a second resistor, and the second resistor is connected in series between the output end of the first comparator and the input end of the first inverter;
the second comparison subunit further comprises a third resistor, and the third resistor is connected in series between the output end of the second comparator and the input end of the second inverter.
Optionally, the first comparison subunit further includes a fourth resistor, and the fourth resistor is connected in series between the output end and the input end of the first inverter;
the second comparison subunit further comprises a fifth resistor, and the fifth resistor is connected in series between the output end and the input end of the second inverter.
Optionally, the detection unit further includes:
and the amplifying subunit is connected in series between the output end of the shutdown judging subunit and the switching unit, and is used for amplifying the control signal output by the shutdown judging subunit and then inputting the amplified control signal to the switching unit.
Optionally, the amplifying sub-unit comprises:
the non-inverting input end of the amplifier is connected with the output end of the shutdown judging subunit, and the output end of the amplifier is connected with the input end of the switching unit;
and the sixth resistor is connected between the inverting input end of the amplifier and the ground in series.
Optionally, the switching unit comprises a transistor, wherein,
the control end of the transistor is connected with the output end of the AND gate to receive the control signal;
the input end of the transistor is connected with the first resistor;
the output terminal of the transistor is connected to the target node.
Optionally, the transistor is an NMOS transistor, wherein,
the grid electrode of the NMOS tube is the control end of the transistor;
the source electrode of the NMOS tube is the input end of the transistor;
and the drain electrode of the NMOS tube is the output end of the transistor.
According to a second aspect of the present invention, there is provided a liquid crystal display device, comprising: a display panel, a driving board, and any one of the power supply circuits of the first aspect, wherein,
the driving board is connected with the display panel to provide scanning signals for controlling the on-off of the thin film transistor and data signals for controlling the pixel unit to display gray scales for the display panel;
the power supply circuit is connected with the display panel to provide backlight voltage for a backlight module of the display panel;
and the power supply circuit is also connected with the driving board to provide working voltage for the driving board.
The utility model has the advantages that:
the power supply circuit comprises a detection unit, a switch unit and a first resistor, wherein the detection unit detects whether the liquid crystal display device enters a shutdown state from a working state or not and generates a control signal according to a detection result; the switch unit and the first resistor are connected in series between a target node and the ground, and the target node is arranged on a line of a power supply circuit outputting working voltage to a drive board of the liquid crystal display device. In the power supply circuit, the switch unit and the detection unit are connected to switch on and off under the control of the control signal, and the switch unit is switched to the conducting state when the liquid crystal display device enters the shutdown state from the working state, so that the first resistor is connected to a circuit of the power supply circuit outputting working voltage to the drive board as a ground resistor only when the liquid crystal display device enters the shutdown state from the working state, the purpose of accelerating the discharge of the drive board is achieved when the liquid crystal display device is shut down, and the circuit load is not increased under the working state of the liquid crystal display device.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic view showing a structure of a related art liquid crystal display device;
fig. 2 shows a schematic diagram of a power supply circuit according to the present invention;
fig. 3 shows another schematic structure of the power supply circuit of the present invention;
fig. 4 shows a schematic circuit connection diagram of the power supply circuit of the present invention;
fig. 5 is a schematic structural diagram of the liquid crystal display device according to the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
Numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of the devices are described below in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a middle power supply circuit according to the present invention, referring to fig. 2, the power supply circuit 2300 includes a detection unit 2310, a switch unit 2320 and a first resistor R1, wherein the detection unit 2310 detects whether the liquid crystal display device is operatedThe state enters a shutdown state, and a control signal Con is generated according to a detection result; the switch unit 2320 and the first resistor R1 are connected in series between a target node P and ground, and the target node P is arranged on the power supply circuit 2300 and outputs a working voltage V to the drive board of the liquid crystal display deviceoutOn the line of (2); the switching unit 2320 and the detecting unit 2310 are connected to perform on-off switching under the control of the control signal Con, and the switching unit 2320 is switched to the on state when the liquid crystal display device enters the shutdown state from the working state.
In particular, the above-mentioned operating voltage VoutFor example, the gate high level voltage VGH and the gate low level voltage VGL required by the gate driving circuit on the driving board, and the supply voltage AVDD converted into the gamma voltage required by the source driving circuit are included.
It should be noted that the liquid crystal display device enters the operating state after being started, and the liquid crystal display device enters the shutdown state from the operating state when the power supply is cut off. The switching unit 2320 is in an off state after the liquid crystal display device is started, that is, the first resistor R1 has no upper part, and is not switched to an on state until the detecting unit 2310 detects that the liquid crystal display device enters a shutdown state from a working state, at this time, the first resistor R1 serves as an upper part of a ground resistor, the power supply circuit 2300 does not supply power to the driving board any more, and residual charges on the driving board are released to the ground through the first resistor R1.
The embodiment of the utility model provides an in, power supply circuit 2300 is through setting up detecting element 2310 and switch unit 2320 for first resistance R1 only just goes up when liquid crystal display device gets into the power off state by operating condition, thereby both reached when liquid crystal display device shuts down and accelerated the purpose that the drive plate discharged, can not increase the circuit load that leads to by first resistance R1 under liquid crystal display device's operating condition again.
Fig. 3 is another schematic structural diagram of the middle power supply circuit of the present invention, and referring to fig. 3, the detecting unit 2310 includes: a first comparing subunit 2311, an input end receives the panel voltage VIN and the first reference voltage VIN _ ref, respectively, and an output end outputs a first comparison result Res1 obtained by comparing the panel voltage VIN and the first reference voltage VIN _ ref; the input end of the second comparison subunit 2312 receives the backlight voltage LED _ EN and the second reference voltage EN _ ref respectively, and the output end outputs a second comparison result Res2 obtained by comparing the backlight voltage LED _ EN and the second reference voltage EN _ ref; the shutdown determination subunit 2313 has inputs respectively connected to the output of the first comparing subunit 2311 and the output of the second comparing subunit 2312, so as to generate the control signal Con according to the first comparison result Res1 and the second comparison result Res 2.
It should be noted that the power supply circuit 2300 receives the panel voltage VIN, and the panel voltage VIN is used for providing the operating voltage V to the driving board after voltage conversionout(ii) a The power supply circuit 2300 further receives a backlight voltage LED _ EN, and the backlight voltage LED _ EN is used for driving a backlight module of a display panel of the liquid crystal display device to emit backlight. Under the condition that the liquid crystal display device is in a normal state, the panel voltage VIN is greater than a first reference voltage Vin _ ref, and the backlight voltage LED _ EN is greater than a second reference voltage EN _ ref; if the lcd device is powered off, the panel voltage VIN will decrease to be less than the first reference voltage VIN _ ref, the backlight voltage LED _ EN will decrease to be less than the second reference voltage EN _ ref, and the detecting unit 2310 combines the panel voltage VIN and the backlight voltage LED _ EN to detect whether the lcd device is powered off from a normal operating state.
Specifically, referring to the circuit diagram of the detection unit 2310 in fig. 4, the first comparison sub-unit 2311 includes a first comparator U11 and a first inverter U12, wherein a non-inverting input terminal of the first comparator U11 receives the panel voltage VIN and an inverting input terminal thereof receives the first reference voltage VIN _ ref, and an input terminal of the first inverter U12 is connected to an output terminal of the first comparator U11; the second comparing sub-unit 2312 comprises a second comparator U21 and a second inverter U22, wherein a non-inverting input terminal of the second comparator U21 receives the backlight voltage LED _ EN and an inverting input terminal thereof receives the second reference voltage EN _ ref, and an input terminal of the second inverter U22 is connected to an output terminal of the second comparator U21; the shutdown determination subunit 2313 includes an and gate, the input terminals of which are respectively connected to the output terminal a1 of the first inverter U12 and the output terminal a2 of the second inverter U22, and the output terminal B of which outputs the control signal Con.
The operating principle of the circuit diagram shown in fig. 4 is as follows:
(1) if the lcd device is in operation, VIN > VIN _ ref, and then the comparison result output by the first comparator U11 is a logic value 1, which is inverted by the first inverter U12 to obtain a first comparison result Res1 being 0; and LED _ EN > EN _ ref, the comparison result output by the second comparator U21 is a logic value 1, and the logic value is inverted by the second inverter U22 to obtain a second comparison result Res2 being 0; finally, the and gate output control signal Con is equal to 0, the switching unit 2320 is turned off, and the first resistor R1 is not connected to the load.
(2) If the liquid crystal display device enters a shutdown state from a working state, the following steps: VIN < VIN _ ref, and then the comparison result output by the first comparator U11 is a logic value 0, which is inverted by the first inverter U12 to obtain a first comparison result Res1 being 1; and LED _ EN < EN _ ref, the comparison result output by the second comparator U21 is a logic value 0, and the logic value is inverted by the second inverter U22 to obtain a second comparison result Res2 being 1; finally, the and gate outputs the control signal Con equal to 1, the switching unit 2320 is turned on, and the first resistor R1 is connected.
It should be noted that the shutdown determination subunit 2313 employs an and gate, and the and gate outputs the control signal Con equal to 0 if the power supply lines of the panel voltage VIN and the backlight voltage LED _ EN are not cut off at the same time, that is, if only the panel voltage VIN falls below the first reference voltage VIN _ ref or only the backlight voltage LED _ EN falls below the second reference voltage EN _ ref.
The embodiment of the utility model provides an in, detecting element 2310 combines panel voltage VIN and backlight voltage LED _ EN to detect whether liquid crystal display device gets into the power-off state by normal operating condition, and only panel voltage VIN and backlight voltage LED _ EN's power supply line cuts off back first resistance R1 simultaneously and just goes up, and it is that panel voltage VIN and backlight voltage LED _ EN's power supply line all cuts off the adaptation with the shutdown of liquid crystal display device like this.
In another alternative embodiment, the first comparator sub-unit 2311 further comprises a second resistor R2, and a second resistor R2 is connected in series between the output terminal of the first comparator U11 and the input terminal of the first inverter U12; the second comparator unit 2312 further includes a third resistor R3, and a third resistor R3 is connected in series between the output terminal of the second comparator U21 and the input terminal of the second inverter U22.
It should be noted that the first comparing sub-unit 2311, the second comparing sub-unit 2312 and the shutdown judging sub-unit 2313 all work in the dc small-signal mode, and the resistances of the second resistor R2 and the third resistor R3 are also very small, and the power consumption of these devices is much less than the power consumption increased after the first resistor R1 is loaded.
In the embodiment of the present invention, if the liquid crystal display device is switched to the shutdown state by the operating state, the first comparator U11 and the second comparator U21 all output the low level signal, the setting of the second resistor R2 and the third resistor R3 makes the low level signal output by the first comparator U11 and the second comparator U21 input to the phase inverter connected separately after further voltage drop, so that the phase inverter ensures to receive the low level signal, and thus the detection precision of the shutdown state is improved.
In another alternative embodiment, the first comparator sub-unit 2311 further includes a fourth resistor R4, and the fourth resistor R4 is connected in series between the output terminal a1 and the input terminal of the first inverter U12, so that the first inverter U12 further has a signal amplifying function; the second comparing subunit 2312 further includes a fifth resistor R5, and the fifth resistor R5 is connected in series between the output terminal a2 and the input terminal of the second inverter U22, so that the second inverter U22 also has a signal amplifying function.
It should also be noted that, the resistances of the fourth resistor R4 and the fifth resistor R5 are very small, and the power consumption added by the fourth resistor R4 and the fifth resistor R5 is much less than the power consumption added by the first resistor R1 after being loaded.
The embodiment of the utility model provides an in, first phase inverter U12 and second phase inverter U22 have inverting and amplification function concurrently, if liquid crystal display device switches to the shutdown state by operating condition, then first phase inverter U12 and second phase inverter U22 all export obvious high level signal to ensure that the AND gate that shutdown was judged subunit 2313 and was adopted can export the control signal Con of high level, therefore improved the control accuracy to switching unit 2320 under the shutdown state.
In another alternative embodiment, the detection unit 2310 further includes: the amplifying sub-unit 2314 is connected in series between the output end of the shutdown determination sub-unit 2313 and the switching unit 2320, and is configured to amplify the control signal Con output by the shutdown determination sub-unit 2313 and input the amplified control signal Con to the switching unit 2320.
Specifically, the amplifying sub-unit 2314 includes: the non-inverting input end of the amplifier U4 is connected to the output end of the shutdown determination subunit 2313, and the output end C is connected to the input end of the switching unit 2320; the sixth resistor R6 is connected in series between the inverting input terminal of the amplifier U4 and ground, so as to avoid the problem of unreliable amplification function caused by the floating of the inverting input terminal of the amplifier U4.
It should be understood that the seventh resistor R7 in fig. 4 is connected in series between the output terminal C and the inverting input terminal of the amplifier U4 to form a closed loop to realize the amplification function of the amplifier U4.
The embodiment of the utility model provides an in, enlarge the control signal Con that subunit 2314 was judged the output to the shutdown and input switch unit 2320 after enlargeing, ensure like this that switch unit 2320 can receive high-level control signal Con when liquid crystal display device shuts down, therefore improved switch unit 2320's under the shutdown state control accuracy
In another alternative embodiment, the switching unit 2320 includes a transistor, wherein a control terminal of the transistor is connected to an output terminal of the and gate to receive the control signal Con; the input end of the transistor is connected with a first resistor R1; the output terminal of the transistor is connected to the target node P. Specifically, the transistor may adopt an NMOS transistor, wherein a gate of the NMOS transistor is a control end of the transistor; the source electrode of the NMOS tube is the input end of the transistor; the drain electrode of the NMOS tube is the output end of the transistor, so that the NMOS tube is switched on under the condition that the control signal Con is high in level, and the NMOS tube is switched off under the condition that the control signal Con is low in level.
Specifically, if the detection unit 2310 includes the amplifying sub-unit 2314, the control terminal of the transistor and the output terminal of the and gate are connected through the amplifying sub-unit 2314, that is, the output terminal B of the and gate and the input terminal of the amplifying sub-unit 2314 are connected and the control terminal of the transistor and the output terminal C of the amplifying sub-unit 2314 are connected.
The embodiment of the utility model provides an in, switch element 2320 constructs through the transistor, simple structure, and switching performance is secure.
Corresponding to any one of the above-mentioned supply circuit 2300, the utility model also provides a liquid crystal display device.
Fig. 5 is a schematic structural diagram of the liquid crystal display device of the present invention, and referring to fig. 5, the liquid crystal display device 2000 includes: a display panel 2100, a driving board 2200 and any one of the power supply circuits 2300 described above, wherein the driving board 2200 and the display panel 2100 are connected to supply a scan signal G [ i ] for controlling on/off of the thin film transistor to the display panel 2100]And data signal Sj for controlling pixel unit to display gray scale](ii) a The power supply circuit 2300 is connected to the display panel 2100 to provide a backlight voltage LED _ EN to the backlight module of the display panel 2100; and, the power supply circuit 2300 is further connected to the driving board 2200 to supply the operating voltage V to the driving board 2200out. It should be understood that the supply circuit 2300 still comprises a supply unit 2350, the supply unit 2350 receiving a power signal and providing said backlight voltage LED _ EN and said operating voltage V based on said power signalout. Since the liquid crystal display device 2000 employs the power supply circuit 2300, it is possible to accelerate the discharge of the driving board 2200 when the device is turned off, and it is possible to prevent an increase in the circuit load due to the first resistor R1 when the device is in operation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A power supply circuit for a liquid crystal display device, comprising:
the detection unit is used for detecting whether the liquid crystal display device enters a shutdown state from a working state or not and generating a control signal according to a detection result;
the switch unit and the first resistor are connected in series between a target node and the ground, and the target node is arranged on a line of the power supply circuit for outputting working voltage to the liquid crystal display device driving plate;
the switch unit is connected with the detection unit to switch on and off under the control of the control signal, and the switch unit is switched to be in a conducting state when the liquid crystal display device enters a shutdown state from a working state.
2. The power supply circuit of the liquid crystal display device according to claim 1, wherein the detection unit includes:
the input end of the first comparison subunit receives a panel voltage and a first reference voltage respectively, and the output end of the first comparison subunit outputs a first comparison result obtained by comparing the panel voltage with the first reference voltage;
the input end of the second comparison subunit receives the backlight voltage and a second reference voltage respectively, and the output end of the second comparison subunit outputs a second comparison result obtained by comparing the backlight voltage with the second reference voltage;
and an input end of the shutdown judging subunit is connected with an output end of the first comparing subunit and an output end of the second comparing subunit respectively, so as to generate the control signal according to the first comparing result and the second comparing result.
3. The power supply circuit of claim 2, wherein the first comparator unit comprises a first comparator and a first inverter, wherein a non-inverting input terminal of the first comparator receives the panel voltage and an inverting input terminal of the first comparator receives the first reference voltage, and an input terminal of the first inverter is connected to an output terminal of the first comparator;
the second comparison subunit comprises a second comparator and a second inverter, wherein the non-inverting input terminal of the second comparator receives the backlight voltage and the inverting input terminal of the second comparator receives the second reference voltage, and the input terminal of the second inverter is connected with the output terminal of the second comparator;
the shutdown judging subunit comprises an and gate, an input end of the and gate is respectively connected with an output end of the first phase inverter and an output end of the second phase inverter, and an output end of the and gate outputs the control signal.
4. The power supply circuit of claim 3, wherein the first comparator unit further comprises a second resistor, and the second resistor is connected in series between the output terminal of the first comparator and the input terminal of the first inverter;
the second comparison subunit further comprises a third resistor, and the third resistor is connected in series between the output end of the second comparator and the input end of the second inverter.
5. The power supply circuit of claim 3, wherein the first comparator unit further comprises a fourth resistor, and the fourth resistor is connected in series between the output terminal and the input terminal of the first inverter;
the second comparison subunit further comprises a fifth resistor, and the fifth resistor is connected in series between the output end and the input end of the second inverter.
6. The power supply circuit of the liquid crystal display device according to claim 2, wherein the detection unit further comprises:
and the amplifying subunit is connected in series between the output end of the shutdown judging subunit and the switching unit, and is used for amplifying the control signal output by the shutdown judging subunit and then inputting the amplified control signal to the switching unit.
7. The power supply circuit of the liquid crystal display device according to claim 6, wherein the amplification sub-unit includes:
the non-inverting input end of the amplifier is connected with the output end of the shutdown judging subunit, and the output end of the amplifier is connected with the input end of the switching unit;
and the sixth resistor is connected between the inverting input end of the amplifier and the ground in series.
8. The power supply circuit of the liquid crystal display device according to claim 3, wherein the switching unit includes a transistor, wherein,
the control end of the transistor is connected with the output end of the AND gate to receive the control signal;
the input end of the transistor is connected with the first resistor;
the output terminal of the transistor is connected to the target node.
9. The power supply circuit of the liquid crystal display device according to claim 8, wherein the transistor is an NMOS transistor, wherein,
the grid electrode of the NMOS tube is the control end of the transistor;
the source electrode of the NMOS tube is the input end of the transistor;
and the drain electrode of the NMOS tube is the output end of the transistor.
10. A liquid crystal display device, comprising: a display panel, a driving board, and a power supply circuit of the liquid crystal display device of any one of claims 1 to 9,
the driving board is connected with the display panel to provide scanning signals for controlling the on-off of the thin film transistor and data signals for controlling the pixel unit to display gray scales for the display panel;
the power supply circuit is connected with the display panel to provide backlight voltage for a backlight module of the display panel;
and the power supply circuit is also connected with the driving board to provide working voltage for the driving board.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120101531.5U CN214175661U (en) | 2021-01-14 | 2021-01-14 | Power supply circuit of liquid crystal display device and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120101531.5U CN214175661U (en) | 2021-01-14 | 2021-01-14 | Power supply circuit of liquid crystal display device and liquid crystal display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115631725A (en) * | 2022-12-20 | 2023-01-20 | 惠科股份有限公司 | Display driving architecture, display driving method and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115631725A (en) * | 2022-12-20 | 2023-01-20 | 惠科股份有限公司 | Display driving architecture, display driving method and display device |
| US11842672B1 (en) | 2022-12-20 | 2023-12-12 | HKC Corporation Limited | Display driving architecture, display driving method, and display device |
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