CN109523968B - Control circuit and display device - Google Patents
Control circuit and display device Download PDFInfo
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- CN109523968B CN109523968B CN201811585912.4A CN201811585912A CN109523968B CN 109523968 B CN109523968 B CN 109523968B CN 201811585912 A CN201811585912 A CN 201811585912A CN 109523968 B CN109523968 B CN 109523968B
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The invention discloses a control circuit and a display device, wherein the control circuit comprises: the power supply, the voltage detection circuit, the main controller, the pulse generation circuit and the voltage generation circuit; the detection end of the voltage detection circuit is connected with the output end of the power supply, the output end of the voltage detection circuit is connected with the input end of the main controller, the output end of the main controller is connected with the first input end of the pulse generation circuit, the second input end of the pulse generation circuit is connected with the voltage signal output end of the voltage generation circuit, the output end of the pulse generation circuit is connected with the signal input end of the voltage generation circuit, and the power input end of the voltage generation circuit is connected with the output end of the power supply. The invention solves the problem that the electric charge in the liquid crystal unit can not be normally released because the voltage input to the active switch is reduced too fast when the display device is shut down.
Description
Technical Field
The invention relates to the technical field of display, in particular to a control circuit and a display device.
Background
When the display device is turned off, all the active switches are controlled to be turned on to release the charges stored in the liquid crystal unit, however, in the process of turning off the display device, the charges stored in the liquid crystal unit cannot be normally released due to the fact that the voltage input to the active switches is reduced too fast.
Disclosure of Invention
The embodiment of the application provides a control circuit and a display device, and aims to solve the problem that in the shutdown process of the display device, charges stored in a liquid crystal unit cannot be normally released due to the fact that the voltage input to an active switch is reduced too fast.
To achieve the above object, the present invention provides a control circuit, including:
a power supply;
a voltage generating circuit having a power input terminal, a signal input terminal, and a voltage signal output terminal;
the detection end of the voltage detection circuit is connected with the output end of the power supply and is used for outputting a corresponding voltage detection signal when detecting that the voltage output by the power supply is reduced to a reference value;
the input end of the main controller is connected with the output end of the voltage detection circuit and is used for generating and outputting a corresponding control signal according to the voltage detection signal;
the pulse generating circuit is provided with a first input end, a second input end and an output end, the first input end of the pulse generating circuit is connected with the output end of the main controller, the second input end of the pulse generating circuit is connected with the voltage signal output end of the voltage generating circuit, and the output end of the pulse generating circuit is connected with the signal input end of the voltage generating circuit and used for outputting a pulse signal with an increased duty ratio according to the control signal and the voltage signal output by the voltage generating circuit;
and the voltage generating circuit is used for generating and outputting a corresponding voltage signal according to the pulse signal so as to control the active switch to be switched on.
Optionally, the voltage detection circuit includes a voltage division detection circuit and a switch circuit, a detection end of the voltage division detection circuit is the detection end of the voltage detection circuit, an output end of the voltage division detection circuit is connected with a controlled end of the switch circuit, and an output end of the switch circuit is the output end of the voltage detection circuit.
Optionally, the voltage division detection circuit includes a first resistor and a second resistor, a first end of the first resistor is a detection end of the voltage division detection circuit, a second end of the first resistor is an output end of the voltage division detection circuit, and is connected to a first end of the second resistor, and a second end of the second resistor is grounded.
Optionally, the switch circuit includes a first dc power supply, a first electronic switch and a third resistor, an output end of the first dc power supply is connected to a first end of the third resistor, and a second end of the third resistor is an output end of the switch circuit and is connected to a first execution end of the first electronic switch; the controlled end of the first electronic switch is the controlled end of the switch circuit, and the second execution end of the first electronic switch is grounded.
Optionally, the first electronic switch is an N-type insulating field effect transistor, a gate of the N-type insulating field effect transistor is a controlled end of the first electronic switch, a drain of the N-type insulating field effect transistor is a first executing end of the first electronic switch, and a source of the N-type insulating field effect transistor is a second executing end of the first electronic switch.
Optionally, the voltage generating circuit includes a second electronic switch, an inductor, a diode, and a capacitor; one end of the inductor is a power supply input end of the voltage generating circuit, and the other end of the inductor is interconnected with the first execution end of the second electronic switch and the anode of the diode; the controlled end of the second electronic switch is a signal input end of the voltage generating circuit, and the second execution end of the second electronic switch is grounded; the negative electrode of the diode is a voltage signal output end of the voltage generating circuit and is connected with one end of the capacitor, and the other end of the capacitor is grounded.
Optionally, the second electronic switch is an N-type insulating field effect transistor, a gate of the N-type insulating field effect transistor is a controlled end of the second electronic switch, a drain of the N-type insulating field effect transistor is a first executing end of the second electronic switch, and a source of the N-type insulating field effect transistor is a second executing end of the second electronic switch.
In order to achieve the above object, the present invention further provides a control circuit, including:
a power supply;
a voltage generating circuit having a power input terminal, a signal input terminal, and a voltage signal output terminal;
the detection end of the voltage detection circuit is connected with the output end of the power supply and is used for outputting a corresponding voltage detection signal when detecting that the voltage output by the power supply is reduced to a reference value;
the input end of the main controller is connected with the output end of the voltage detection circuit and is used for generating and outputting a corresponding control signal according to the voltage detection signal;
the pulse generating circuit comprises a triangular wave generating circuit and an operational amplifying circuit; the input end of the triangular wave generating circuit is connected with the output end of the main controller, the output end of the triangular wave generating circuit is connected with the first input end of the operational amplifying circuit, and the second input end of the operational amplifying circuit is connected with the voltage signal output end of the voltage generating circuit; the output end of the operational amplification circuit is connected with the signal input end of the voltage generation circuit, and the pulse generation circuit is used for outputting a pulse signal with an increased duty ratio according to the control signal and the voltage signal output by the voltage generation circuit;
and the voltage generating circuit is used for generating and outputting a corresponding voltage signal according to the pulse signal so as to control the active switch to be switched on.
In order to achieve the above object, the present invention further provides a display device, including a display panel, a circuit board and the control circuit as described in any one of the above, wherein the circuit board is connected to the display panel, and the control circuit is disposed on the circuit board.
According to the technical scheme, the voltage value output by the power supply is detected through the voltage detection circuit, when the voltage output by the power supply is detected to be reduced to the reference value, the corresponding voltage detection signal is output to the main controller, the main controller outputs the corresponding control signal to the pulse generation circuit according to the voltage detection signal so as to control the pulse generation circuit to output the pulse signal with the increased duty ratio, the pulse signal acts on the voltage generation circuit, the voltage output to the active switch by the voltage generation circuit is increased, the higher the voltage of the active switch is, the better the opening state of the active switch is, and therefore the charges stored in the liquid crystal unit can be quickly released when the display device is shut down.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a control circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of an embodiment of the voltage detection circuit of FIG. 1;
FIG. 3 is a block diagram of an embodiment of the pulse generating circuit of FIG. 1;
fig. 4 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a control circuit.
Referring to fig. 1, in an embodiment of the present invention, the control circuit includes:
the power supply circuit comprises a power supply 50, a voltage detection circuit 10, a main controller 20, a pulse generation circuit 30 and a voltage generation circuit 40, wherein the voltage generation circuit 40 is provided with a power supply input end, a signal input end and a voltage signal output end; the pulse generating circuit 30 has a first input terminal, a second input terminal and an output terminal. The detection end of the voltage detection circuit 10 is connected with the output end of the power supply 50, the output end of the voltage detection circuit 10 is connected with the input end of the main controller 20, the output end of the main controller 20 is connected with the first input end of the pulse generation circuit 30, the second input end of the pulse generation circuit 30 is connected with the voltage signal output end of the voltage generation circuit 40, the output end of the pulse generation circuit 30 is connected with the signal input end of the voltage generation circuit 40, and the power input end of the voltage generation circuit 40 is connected with the output end of the power supply 50.
In this embodiment, the voltage detection circuit 10 is configured to output a corresponding voltage detection signal when detecting that the voltage output by the power supply 50 decreases to a reference value. The voltage detection circuit 10 may adopt a sampling resistor for voltage division detection, a hall sensor or a special voltage detection chip for voltage detection, and is not limited herein.
In this embodiment, the main controller 20 is configured to generate and output a corresponding control signal according to the voltage detection signal. The main controller 20 may be a single chip, a digital signal processor DSP, a field programmable gate array FPGA, or other microprocessor, which is not limited herein.
In this embodiment, the pulse generating circuit 30 is configured to output a pulse signal with an increased duty ratio according to the control signal and the voltage signal output by the voltage generating circuit 40. The pulse generating circuit 30 may include a triangular wave generating circuit 301 and an operational amplifier circuit 302, or may adopt various circuit designs in the prior art, which is not limited herein.
In this embodiment, the voltage generating circuit 40 is configured to generate a corresponding voltage signal according to the pulse signal to control the active switch to be turned on. The voltage generating circuit 40 can be implemented by various circuits in the prior art, and is not limited herein.
In this embodiment, the voltage output by the output terminal VIN of the power supply 50 is detected by the voltage detection circuit 10, when the voltage output by the power supply 50 is detected to be reduced to a reference value, the reference value is used to determine whether the display device enters a shutdown state, the voltage detection circuit 10 outputs a corresponding voltage detection signal to the main controller 20, the main controller 20 outputs a corresponding control signal to the pulse generation circuit 30 according to the received voltage detection signal, so as to control the pulse generation circuit 30 to generate a pulse signal with an increased duty ratio, and the pulse signal acts on the voltage generation circuit 40, so that the voltage output by the voltage generation circuit 40 is increased. The voltage acts on the active switch, the active switch of the embodiment can be realized by adopting a thin film transistor, and is not limited specifically, all the active switches can be ensured to be normally opened in the shutdown process, so that charges stored in the liquid crystal unit connected with the active switch can be quickly released. With such an arrangement, the voltage level of the starting voltage of the active switch is increased, the higher the voltage level of the starting voltage of the active switch is, the slower the voltage falling trend of the active switch is in the shutdown process, the better the on state of the active switch is, and the electric charge stored in the liquid crystal unit can be quickly released.
In one embodiment, referring to fig. 2, the voltage detection circuit 10 includes: the voltage divider circuit comprises a voltage division detection circuit 101 and a switch circuit 102, wherein a detection end of the voltage division detection circuit 101 is a detection end of the voltage detection circuit 10, and an output end of the voltage division detection circuit 101 is connected with a controlled end of the switch circuit 102; the output terminal of the switching circuit 102 is the output terminal of the voltage detection circuit 10.
As an embodiment of the present invention, referring to fig. 4, the voltage division detecting circuit 101 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is a detecting end of the voltage division detecting circuit 101, a second end of the first resistor R1 is an output end of the voltage division detecting circuit 101 and is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded.
Specifically, the first resistor R1 and the second resistor R2 adopt serial voltage division, according to the principle of voltage division, the larger the ratio between the first resistor R1 and the second resistor R2 is, the larger the voltage divided across the first resistor R1 is, and the magnitude of the voltage divided by the first resistor R1 and the second resistor R2 can adjust the turn-off or turn-on of the first electronic switch Q1 of the switch circuit 102, for example, when the display device normally works, the voltage output by the power supply is large enough, the voltage output after voltage division by the first resistor R1 and the second resistor R2 is larger than the conduction threshold of the first electronic switch Q1, at this time, the first electronic switch Q1 is conducted, when the display device is turned off, the voltage output by the power supply 50 gradually decreases, and when the voltage decreases to a reference value, the voltage divided by the first resistor R1 and the second resistor R2 is smaller than the turn-on threshold of the first electronic switch Q1, and at this time, the first electronic switch Q1 is turned off.
Referring to fig. 4, as an embodiment of the present invention, the switch circuit 102 includes a first dc power supply VDD, a first electronic switch Q1, and a third resistor R3, an output terminal of the first dc power supply VDD is connected to a first terminal of the third resistor R3, a second terminal of the third resistor R3 is an output terminal of the switch circuit 102 and is connected to a first execution terminal of the first electronic switch Q1; the controlled terminal of the first electronic switch Q1 is the controlled terminal of the switch circuit 102, and the second execution terminal of the first electronic switch Q1 is grounded.
As an embodiment of the present invention, the first electronic switch Q1 may be an N-type insulated field effect transistor, i.e., an N-MOS transistor, a gate of the N-MOS transistor is a controlled terminal of the first electronic switch Q1, a drain of the N-MOS transistor is a first executing terminal of the first electronic switch Q1, and a source of the N-MOS transistor is a second executing terminal of the first electronic switch Q1. In other embodiments, the first electronic switch Q1 may also be implemented by a transistor, an insulated gate bipolar transistor IGBT, or other switching tubes, which is not limited herein.
Specifically, when the display device normally works, because the voltage output by the power supply 50 is large enough, after being divided by the first resistor R1 and the second resistor R2, the voltage output to the first electronic switch Q1 is greater than the turn-on threshold thereof, the first electronic switch Q1 is in the turn-on state, the voltage at the lower end of the third resistor R3 is 0, and a voltage detection signal representing 0V is output to the main controller 20, so that the main controller 20 generates a corresponding control signal according to the received voltage detection signal; when the display device is turned off, the voltage output by the power supply 50 gradually decreases, the voltage divided by the first resistor R1 and the second resistor R2 also decreases, when the voltage output by the power supply 50 decreases to a reference value, the voltage output to the first electronic switch Q1 is smaller than the on-threshold, the first electronic switch Q1 is switched from the on-state to the off-state, and at this time, the voltage at the lower end of the third resistor R3 is changed from 0V to the voltage value of the first dc power supply VDD and is output to the main controller 20, so that the main controller 20 generates a corresponding control signal according to the received voltage detection signal.
In one embodiment, referring to fig. 1, the control circuit further includes a main controller, and the main controller 20 may be integrated with an ADC (Analog-to-Digital Converter) module, and may also be integrated with a software program for analyzing the received voltage detection signal representing the voltage magnitude. The received voltage detection signal is analyzed by running or executing a software program and/or module stored in the memory of the main controller 20, thereby generating a corresponding control signal and outputting the same to the pulse generating circuit 30.
In one embodiment, referring to fig. 3, the pulse generating circuit 30 includes a triangular wave generating circuit 301 and an operational amplifying circuit 302; the input end of the triangular wave generating circuit 301 is the first input end of the pulse generating circuit 30, the output end of the triangular wave generating circuit 301 is connected with the first input end of the operational amplifying circuit 302, and the second input end of the operational amplifying circuit 302 is the second input end of the pulse generating circuit 30; the output terminal of the operational amplifier circuit 302 is the output terminal of the pulse generator circuit 30.
The triangular wave generating circuit 301 and the operational amplifier circuit 302 may employ various circuits in the prior art, and are not limited herein.
As an embodiment of the present invention, referring to fig. 4, the operational amplifier circuit 302 may employ an operational amplifier OP, a non-inverting input terminal of the operational amplifier OP is a first input terminal of the operational amplifier circuit 302, an inverting input terminal of the operational amplifier OP is a second input terminal of the operational amplifier circuit 302, and an output terminal of the operational amplifier OP is an output terminal of the operational amplifier circuit 302.
Specifically, when the display device normally operates, the main controller 20 outputs a corresponding control signal to the triangular wave generating circuit 301 according to the received voltage detection signal, for example, a voltage signal of 0V, so as to control the triangular wave generating circuit 301 to output a triangular wave with a smaller amplitude, for example, a triangular wave with an amplitude of 5V, the triangular wave is input to the non-inverting input terminal of the operational amplifier OP, the voltage VGH output by the voltage generating circuit 40 is input to the inverting input terminal of the operational amplifier OP, and the triangular wave is differentiated from the voltage VGH and then outputs a square wave with a smaller duty ratio, for example, a square wave with a duty ratio of 50% through the output terminal of the operational amplifier OP. When the display device is turned off, the voltage output by the power supply 50 gradually decreases, and when the voltage decreases to a reference value, the main controller 20 outputs a corresponding control signal to the triangular wave generating circuit 301 according to the received voltage detection signal, for example, the voltage signal of the first dc power VDD, so as to control the amplitude of the triangular wave generated by the triangular wave generating circuit 301 to increase, for example, output a triangular wave with an amplitude of 9V, and after the triangular wave is differentiated from the voltage VGH, the output end of the operational amplifier OP outputs a square wave with an increased duty ratio, for example, a square wave with a duty ratio of 90%.
The characteristics of the operational amplifier OP are: if the voltage input by the non-inverting input terminal is greater than the voltage input by the inverting input terminal, the output of the operational amplifier circuit 302 is high, and if the voltage input by the non-inverting input terminal is less than the voltage input by the inverting input terminal, the output of the operational amplifier circuit 302 is low, so that when the amplitude of the input triangular wave is increased, the duty ratio of the square wave output by the operational amplifier circuit 302 is correspondingly increased. The square wave with the increased duty ratio is applied to the voltage generation circuit 40, so that the voltage output by the voltage generation circuit 40 can be increased.
In one embodiment, referring to fig. 4, the voltage generating circuit 40 includes a second electronic switch Q2, an inductor L, a diode D, and a capacitor C; one end of the inductor L is a power input end of the voltage generating circuit 40, and the other end of the inductor L is interconnected with the first execution end of the second electronic switch Q2 and the anode of the diode D; the controlled terminal of the second electronic switch Q2 is the signal input terminal of the voltage generating circuit 40, and the second executing terminal of the second electronic switch Q2 is grounded; the cathode of the diode D is the voltage signal output end of the voltage generating circuit 40, and is connected to one end of the capacitor C, and the other end of the capacitor C is grounded.
As an embodiment of the present invention, the second electronic switch Q2 may be an N-type insulated field effect transistor, i.e., an N-MOS transistor, a gate of the N-MOS transistor is a controlled terminal of the second electronic switch Q2, a drain of the N-MOS transistor is a first executing terminal of the second electronic switch Q2, and a source of the N-MOS transistor is a second executing terminal of the second electronic switch Q2. In other embodiments, the second electronic switch Q2 may also be implemented by a transistor, an insulated gate bipolar transistor IGBT, or other switching tubes, which is not limited herein.
Specifically, the pulse generating circuit 30 generates a corresponding pulse signal according to the received control signal and the voltage signal output by the voltage generating circuit 40, and outputs the pulse signal to the controlled terminal of the second electronic switch Q2 of the voltage generating circuit 40, so as to control the second electronic switch Q2 to be turned on or off. When the display device is normally operated, the pulse generating circuit 30 outputs a pulse signal with a small duty ratio, for example, a pulse signal with a 50% duty ratio, according to the corresponding control signal, and when the display device is turned off, the pulse generating circuit 30 outputs a pulse signal with an increased duty ratio, for example, a pulse signal with a 90% duty ratio, according to the corresponding control signal. Since the larger the duty ratio of the pulse signal applied to the second electronic switch Q2, the longer the on-time of the second electronic switch Q2, the larger the inductor energy stored in the inductor L, and the higher the voltage output by the voltage generation circuit 40. When the display device is turned off, the voltage VGH output by the voltage generating circuit 40 can be effectively increased by increasing the duty ratio of the pulse signal input to the voltage generating circuit 40, and the voltage acts on the active switch, so that the on state of the active switch is better, and the charge stored in the liquid crystal unit is released more quickly. The voltage generating circuit 40 is further configured to feed back the generated voltage VGH to the second input terminal of the pulse generating circuit 30, so as to adjust the output voltage to be maintained within a certain range, and avoid shutdown abnormality caused by an excessively large or small output voltage.
It should be understood that, since the display device is in the power-off state at this time, the voltage output by the power supply 50 gradually decreases, and therefore, the voltage VGH output by the voltage generating circuit 40 still tends to decrease, that is, the voltage VGH output by the voltage generating circuit 40 gradually decreases. However, according to the technical solution of the present invention, in the shutdown process of the display device, by increasing the duty ratio of the pulse signal input to the voltage generating circuit 40, it is possible to achieve a larger voltage output to the active switch in the same time period, so that it is possible to ensure that the on state of the active switch is better in the shutdown process, and the charges stored in the liquid crystal unit can be released more quickly.
The invention also provides a display device, which comprises the control circuit, a display panel and a circuit board, wherein the circuit board is connected with the display panel, and the control circuit is arranged on the circuit board. The detailed structure of the control circuit can refer to the above embodiments, and is not described herein; it can be understood that, because the display device of the present invention uses the control circuit, the embodiment of the display device of the present invention includes all technical solutions of all embodiments of the control circuit, and the achieved technical effects are also completely the same, and are not described herein again.
In this embodiment, the display panel includes, but is not limited to, a liquid crystal display panel, an organic light emitting diode display panel, a field emission display panel, a plasma display panel, and a curved panel, and the liquid crystal panel includes a thin film transistor liquid crystal display panel, a TN panel (TN, Twisted Nematic), a VA panel (VA, wide viewing angle), an IPS panel (In-Plane Switching), and the like.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A control circuit, the control circuit comprising:
a power supply;
a voltage generating circuit having a power input terminal, a signal input terminal, and a voltage signal output terminal; the voltage generating circuit comprises a second electronic switch, an inductor, a diode and a capacitor; one end of the inductor is a power supply input end of the voltage generating circuit, and the other end of the inductor is interconnected with the first execution end of the second electronic switch and the anode of the diode; the controlled end of the second electronic switch is a signal input end of the voltage generating circuit, and the second execution end of the second electronic switch is grounded; the negative electrode of the diode is a voltage signal output end of the voltage generating circuit and is connected with one end of the capacitor, and the other end of the capacitor is grounded;
the detection end of the voltage detection circuit is connected with the output end of the power supply and is used for outputting a corresponding voltage detection signal when detecting that the voltage output by the power supply is reduced to a reference value;
the input end of the main controller is connected with the output end of the voltage detection circuit and is used for generating and outputting a corresponding control signal according to the voltage detection signal;
the pulse generating circuit comprises a triangular wave generating circuit and an operational amplifying circuit; the input end of the triangular wave generating circuit is connected with the output end of the main controller, the output end of the triangular wave generating circuit is connected with the first input end of the operational amplifying circuit, and the second input end of the operational amplifying circuit is connected with the voltage signal output end of the voltage generating circuit; the output end of the operational amplification circuit is connected with the signal input end of the voltage generation circuit; the triangular wave generating circuit is used for generating triangular waves with increased amplitudes according to control signals output by the main controller; the pulse generating circuit is used for outputting a pulse signal with an increased duty ratio according to the triangular wave with the increased amplitude and the voltage signal output by the voltage generating circuit;
and the voltage generating circuit is used for generating and outputting a corresponding voltage signal according to the pulse signal so as to control the active switch to be switched on.
2. The control circuit of claim 1, wherein the voltage detection circuit comprises a voltage division detection circuit and a switch circuit, a detection terminal of the voltage division detection circuit is a detection terminal of the voltage detection circuit, an output terminal of the voltage division detection circuit is connected with a controlled terminal of the switch circuit, and an output terminal of the switch circuit is an output terminal of the voltage detection circuit.
3. The control circuit of claim 2, wherein the voltage division detection circuit comprises a first resistor and a second resistor, a first terminal of the first resistor is a detection terminal of the voltage division detection circuit, a second terminal of the first resistor is an output terminal of the voltage division detection circuit and is connected to a first terminal of the second resistor, and a second terminal of the second resistor is grounded.
4. The control circuit of claim 2, wherein the switch circuit comprises a first dc power supply, a first electronic switch and a third resistor, an output terminal of the first dc power supply is connected to a first terminal of the third resistor, and a second terminal of the third resistor is an output terminal of the switch circuit and is connected to a first actuating terminal of the first electronic switch; the controlled end of the first electronic switch is the controlled end of the switch circuit, and the second execution end of the first electronic switch is grounded.
5. The control circuit of claim 4, wherein the first electronic switch is an N-type insulated field effect transistor, a gate of the N-type insulated field effect transistor is a controlled terminal of the first electronic switch, a drain of the N-type insulated field effect transistor is a first actuating terminal of the first electronic switch, and a source of the N-type insulated field effect transistor is a second actuating terminal of the first electronic switch.
6. The control circuit of claim 1, wherein the second electronic switch is an N-type isolation fet, a gate of the N-type isolation fet is a controlled terminal of the second electronic switch, a drain of the N-type isolation fet is a first actuating terminal of the second electronic switch, and a source of the N-type isolation fet is a second actuating terminal of the second electronic switch.
7. A display device, characterized in that the display device comprises: display panel, circuit board and the control circuit of any one of claims 1 to 6, the circuit board being connected with the display panel, the control circuit being arranged on the circuit board.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811585912.4A CN109523968B (en) | 2018-12-24 | 2018-12-24 | Control circuit and display device |
| PCT/CN2019/123385 WO2020134948A1 (en) | 2018-12-24 | 2019-12-05 | Control circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811585912.4A CN109523968B (en) | 2018-12-24 | 2018-12-24 | Control circuit and display device |
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| CN109523968A CN109523968A (en) | 2019-03-26 |
| CN109523968B true CN109523968B (en) | 2021-02-19 |
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|---|---|---|---|---|
| CN109523968B (en) * | 2018-12-24 | 2021-02-19 | 惠科股份有限公司 | Control circuit and display device |
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| CN109523968A (en) | 2019-03-26 |
| WO2020134948A1 (en) | 2020-07-02 |
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