CN211181607U - Voltage regulating circuit and backlight driving circuit - Google Patents
Voltage regulating circuit and backlight driving circuit Download PDFInfo
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- CN211181607U CN211181607U CN202020217612.7U CN202020217612U CN211181607U CN 211181607 U CN211181607 U CN 211181607U CN 202020217612 U CN202020217612 U CN 202020217612U CN 211181607 U CN211181607 U CN 211181607U
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Abstract
The application relates to the technical field of liquid crystal display, and discloses a voltage regulating circuit and a backlight driving circuit, and the voltage regulating circuit comprises: the comparison unit comprises a comparator, the positive phase input end and the negative phase input end of the comparator respectively receive the input voltage and the reference voltage provided by the power module, and the output end of the comparator generates a control signal; and the voltage regulating unit is connected with the output end of the comparison unit to receive the control signal and is used for taking the input voltage or the voltage subjected to voltage reduction processing of the input voltage as output voltage according to the control signal. The backlight driving circuit comprises the voltage regulating circuit, so that the situation that when a backlight source is smaller than 8 strings of lamps, the output voltage of the driving module is larger than the input voltage due to boosting can be avoided, the design requirement is met, the digital circuit is simple, the power consumption is low, and the driving circuit can be integrated on one chip.
Description
Technical Field
The utility model relates to a liquid crystal display technology field, in particular to voltage regulation circuit and drive circuit is shaded.
Background
Liquid crystal display devices have the advantages of being light, thin, energy-saving, low in power consumption and the like, and have been widely used in electronic devices such as televisions, computers, mobile phones and the like. As a passive display device, a liquid crystal display device requires a driving circuit to supply power to a backlight thereof.
At present, the input voltage provided by a power supply module in a computer system provides voltage for a backlight driving circuit, when the input voltage is 5-21V and the backlight source uses less than 8 strings of lamps, the output voltage of the backlight driving circuit is boosted in a boosting circuit, so that the output voltage is inevitably greater than the input voltage, and the design requirement that the output voltage is less than the input voltage cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a voltage regulating circuit and a backlight driving circuit including the same, which can regulate the voltage received by the driving module.
According to the utility model discloses an aspect provides a voltage regulating circuit, include: the comparison unit comprises a comparator, the positive phase input end and the negative phase input end of the comparator respectively receive the input voltage and the reference voltage provided by the power module, and the output end of the comparator generates a control signal; and the voltage regulating unit is connected with the output end of the comparison unit to receive the control signal and is used for taking the input voltage or the voltage subjected to voltage reduction processing of the input voltage as output voltage according to the control signal.
Preferably, the comparing unit further includes: a first resistor, a first end of which receives an input voltage and a second end of which is connected with a non-inverting input end of the comparator; a second resistor, a first end of the second resistor receiving a reference voltage, a second end of the second resistor being connected to an inverting input terminal of the comparator; and the first end of the third resistor receives a power supply voltage, and the second end of the third resistor is connected with the output end of the comparator.
Preferably, the comparing unit further includes: a first resistor, a first end of which receives an input voltage and a second end of which is connected with a non-inverting input end of the comparator; a second resistor, a first end of the second resistor receiving a reference voltage, a second end of the second resistor being connected to an inverting input terminal of the comparator; a first end of the third resistor receives a power supply voltage, and a second end of the third resistor is connected with an output end of the comparator; and a first end of the fourth resistor is connected to the middle node of the second resistor and the comparator, and a second end of the fourth resistor is grounded.
Preferably, the voltage adjusting unit includes: the digital switch comprises a control end, a normal phase input end, an inverse phase input end, a first output end and a second output end, wherein the control end is connected with the output end of the comparator to receive the control signal, the normal phase input end is connected with and receives the input voltage, the inverse phase input end is grounded, and the second output end is used as the output end of the voltage regulating unit; and the negative electrode of the voltage stabilizing diode is connected with the first output end of the digital switch, and the positive electrode of the voltage stabilizing diode is used as the output end of the voltage regulating unit, wherein the control signal is used for controlling the communication between the positive phase input end and one of the first output end or the second output end.
Preferably, the method further comprises the following steps: and a first end of the fifth resistor is connected with the output end of the voltage regulating unit, and a second end of the fifth resistor is grounded.
Preferably, the method further comprises the following steps: and the first input end and the second input end of the logic AND gate are connected with the output end of the comparator, and the output end of the logic AND gate is used as the output end of the comparison unit.
Preferably, the digital switch includes: the digital switch comprises a first transistor and a second transistor, wherein the grid electrode of the first transistor is connected with the grid electrode of the second transistor and is used as the control end of the digital switch, the drain electrode of the first transistor is connected with the drain electrode of the second transistor and is used as the non-inverting input end of the digital switch, the source electrode of the first transistor is used as the first output end of the digital switch, the source electrode of the second transistor is used as the second output end of the digital switch, and the first transistor and the second transistor are different in type.
Preferably, the digital switch includes: the input end of the second inverter is connected with the output end of the comparator; and a gate of the first transistor is connected to the output terminal of the comparator, a gate of the second transistor is connected to the output terminal of the second inverter, a drain of the first transistor is connected to a drain of the second transistor and serves as a non-inverting input terminal of the digital switch, a source of the first transistor serves as a first output terminal of the digital switch, and a source of the second transistor serves as a second output terminal of the digital switch, wherein the first transistor and the second transistor are of the same type.
Preferably, the method further comprises the following steps: and the input end of the first phase inverter is connected with the output end of the comparator, and the output end of the first phase inverter is connected with the middle node between the grid of the first transistor and the input end of the second phase inverter.
According to a second aspect of the present invention, there is provided a backlight driving circuit comprising: the voltage regulating circuit comprises a driving module and a power module, wherein the driving module and the power module are connected with the voltage regulating circuit, the power module supplies power to the voltage regulating circuit, the driving module receives output voltage provided by the output end of the voltage regulating circuit, and the output voltage is used as driving voltage to drive backlight display.
The utility model provides a voltage regulation circuit and drive circuit is shaded through set up voltage regulation circuit in the drive circuit is shaded to adjust drive module's input voltage, thereby avoid when the backlight is less than 8 cluster lamps, drive module output voltage is greater than input voltage because of stepping up, satisfies the design demand.
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. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
Fig. 1 shows a schematic block diagram of a backlight driving circuit according to the present invention.
Fig. 2 shows a schematic diagram of a voltage regulating circuit according to the present invention.
Fig. 3 shows a schematic diagram of another voltage regulation circuit according to the present invention.
Fig. 4 shows an equivalent circuit diagram of the digital switch conducting the first channel according to the present invention.
Fig. 5 shows an equivalent circuit diagram of the digital switch conducting the second channel according to the present invention.
Fig. 6 shows a schematic circuit diagram of another comparison unit according to the present invention.
Fig. 7 shows a simulation circuit diagram of a voltage regulating circuit according to the present invention.
Fig. 8a to 8c show waveforms generated by simulation according to the schematic circuit diagram shown in fig. 7.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The embodiments described in the following preferred embodiments do not represent all embodiments consistent with the present invention.
Fig. 1 shows a schematic block diagram of a backlight driving circuit according to the present invention. As shown in fig. 1, the backlight driving circuit includes: a power module 100, a voltage regulating circuit 200 and a driving module 300.
Specifically, the power module 100 provides a stable input voltage V L ED and a reference voltage Vref for the voltage regulator circuit 200, the voltage regulator circuit 200 compares the input voltage V L ED with the reference voltage Vref, when the input voltage V L ED is greater than or equal to the reference voltage Vref, the output voltage Vout of the voltage regulator circuit 200 is (input voltage V L ED-2) V, and when the input voltage V L ED < the reference voltage Vref, the output voltage Vout of the voltage regulator circuit 200 is the input voltage V L ED, and the driving module 300 receives the output voltage Vout of the voltage regulator circuit 200, and the output voltage Vout serves as a driving voltage to drive the backlight to normally operate.
Fig. 2 shows a schematic diagram of a voltage regulating circuit according to the present invention. As shown in fig. 2, the voltage regulating circuit includes: a comparison unit 210 and a voltage adjustment unit 220.
The comparison unit 210 comprises a comparator U1, a first resistor R1, a second resistor R2 and a third resistor R3, wherein a first end of the first resistor R1 receives an input voltage V L ED, a second end of the first resistor R1 is connected to a non-inverting input end (pin 5) of the comparator U1, a first end of the second resistor R2 receives a reference voltage Vref, a second end of the second resistor R2 is connected to an inverting input end (pin 4) of the comparator U1, and a power input end (pin 3) and a ground end (pin 1) of the comparator U1 are respectively connected with a working voltage V+And a ground; the first end of the third resistor R3 is connected with the working voltage V+And a second terminal is connected to the output terminal (pin 2) of the comparator U1.
The comparator U1 can select a single power supply or a double power supply, and the output end outputs a control signal; the reference voltage Vref is, for example, 18V; operating voltage V+Also available from power modules are: AVDD, VGH.
Further, the voltage regulating circuit further includes a logic and gate U2, a first input terminal and a second input terminal of the logic and gate U2 are both connected to a middle node between the third resistor R3 and the output terminal of the comparator U1, and an output terminal of the logic and gate U2 is used as an output terminal of the comparing unit 210 to output a control signal, i.e., a logic level, including a high level and a low level. The logic and gate U2 is to prevent the comparator U1 from being completely set to 0 when it outputs a low level.
The voltage regulating unit 220 comprises a digital switch S1, a zener diode D1 and a fifth resistor R5., wherein the digital switch S1 comprises a control terminal, a positive phase input terminal, an inverse phase input terminal, a first output terminal and a second output terminal, the control terminal is connected to the output terminal of the comparing unit to receive a control signal, the positive phase input terminal is connected to and receives the input voltage V L ED, the inverse phase input terminal is grounded, the second output terminal is used as the output terminal of the voltage regulating unit 220, the first output terminal of the digital switch S1 is connected to the cathode of the zener diode D1, the anode of the zener diode D1 is used as the output terminal of the voltage regulating unit 220, and the control signal is used for controlling the connection of the positive phase input terminal to one of the first output terminal or.
The input voltage V L ED is compared with the reference voltage Vref by the comparator U1, the comparator U1 outputs a control signal to control the digital switch S1 through the logic and gate U2, when the control signal is at a high level "1", the digital switch S1 turns on the first channel, the input voltage V L ED generates a voltage drop through the zener diode D1, the output voltage Vout is (input voltage V L ED-2) V, when the logic level is at a low level "0", the digital switch S1 turns on the second channel, and the input voltage V L ED is used as the output voltage Vout.
Fig. 3 shows a schematic diagram of another voltage regulation circuit according to the present invention. As shown in fig. 3, the voltage regulating circuit includes: a comparison unit 210 and a voltage adjustment unit 220'.
The comparison unit 210 comprises a comparator U1, a first resistor R1, a second resistor R2 and a third resistor R3, wherein a first end of the first resistor R1 receives an input voltage V L ED, a second end of the first resistor R1 is connected to a non-inverting input end (pin 5) of the comparator U1, a first end of the second resistor R2 receives a reference voltage Vref, a second end of the second resistor R2 is connected to an inverting input end (pin 4) of the comparator U1, and a power input end (pin 3) and a ground end (pin 1) of the comparator U1 are respectively connected with a working voltage V+And a ground; the first end of the third resistor R3 is connected with the working voltage V+And a second terminal is connected to the output terminal (pin 2) of the comparator U1.
Further, the voltage regulating circuit further includes a logic and gate U2, a first input terminal and a second input terminal of the logic and gate U2 are both connected to a middle node between the third resistor R3 and the output terminal of the comparator U1, and an output terminal of the logic and gate U2 is used as an output terminal of the comparing unit 210 to output a control signal, i.e., a logic level, including a high level and a low level. The logic and gate U2 is to prevent the comparator U1 from being completely set to 0 when it outputs a low level.
The voltage regulating unit 220' includes: a digital switch, a zener diode D1, and a fifth resistor R5. The digital switch comprises a first transistor Q1 and a second transistor Q2, wherein the gate of the first transistor Q1 is connected with the gate of the second transistor Q2 and is used as the control end of the digital switch, the drain of the first transistor Q1 is connected with the drain of the second transistor Q2 and is used as the non-inverting input end of the digital switch, the source of the first transistor Q1 is used as the first output end of the digital switch, and the source of the second transistor Q2 is used as the second output end of the digital switch. A first end of the fifth resistor R5 is connected with the source electrode of the second transistor Q2, and a second end is grounded; the zener diode D1 has a cathode connected to the source of the first transistor Q1 and an anode connected to the intermediate node between the first transistor Q1 and the fifth resistor R5. In this embodiment, the first transistor Q1 and the second transistor Q2 are of different types.
Further, the voltage adjusting unit 220' further includes a second inverter U4, an input terminal of the second inverter U4 is connected to an intermediate node between the gate of the first transistor Q1 and the output terminal of the comparator U1, and an output terminal of the second inverter U4 is connected to the gate of the second transistor Q2. In this embodiment, the first transistor Q1 and the second transistor Q2 are of the same type.
Preferably, the inverter further comprises a first inverter U3, wherein an input end of the first inverter U3 is connected with an output end of the comparator U1, and an output end of the first inverter U3 is connected with an intermediate node between a gate of the first transistor Q and an input end of the second inverter U4.
Fig. 4 shows an equivalent circuit diagram of a digital switch conducting a first channel according to the present invention, as shown in fig. 4, the equivalent circuit diagram includes a first inverter U3, a second inverter U4, a first transistor Q1, a second transistor Q2, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8., wherein an input terminal of the first inverter U3 receives a control signal output by a logic and gate, an output terminal of the first inverter U6348 is connected to an input terminal of the second inverter U4, a gate of the first transistor Q R8. is connected to an intermediate node of the first inverter U3 and the second inverter U4, a drain of the first transistor Q638 is connected to a first terminal of the eighth resistor R8, a gate of the second transistor Q2 is connected to an output terminal of the second inverter U4, a drain of the first terminal of the eighth resistor R8, a second terminal of the eighth resistor R8 receives an input voltage V L, a first terminal of the seventh resistor R7 is connected to a source of the first transistor Q5, a second terminal of the second terminal is grounded, a source terminal of the sixth terminal of the transistor Q1 is connected to the ground.
The eighth resistor R8 has a resistance value of 0, the digital switch S1 turns on the first channel when receiving a control signal of a high level, the high level outputs a low level through the first inverter U3, and outputs a high level through the second inverter U4, the low level output by the first inverter U3 is transmitted to the first transistor Q1, the first transistor Q1 is turned on, the high level output by the second inverter U4 is transmitted to the second transistor Q2, the second transistor Q2 is turned off, the input voltage V L ED generates a 2V drop through the first transistor Q1 and the sixth resistor R6, and the output voltage Vout is (the input voltage V L ED-2) V.
Fig. 5 shows an equivalent circuit diagram of the digital switch conducting the second channel according to the present invention, as shown in fig. 5, the equivalent circuit diagram includes a first inverter U3, a second inverter U4, a first transistor Q1, a second transistor Q2, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8., wherein an input terminal of the first inverter U3 receives a control signal output by a logic and gate, an output terminal of the first inverter U4 is connected to an input terminal of the second inverter U4, a gate of the first transistor Q R8. is connected to an intermediate node of the first inverter U3 and the second inverter U4, a drain of the first transistor Q638 is connected to a first terminal of the eighth resistor R8, a gate of the second transistor Q2 is connected to an output terminal of the second inverter U4, a drain of the first terminal of the eighth resistor R8, a second terminal of the eighth resistor R8 receives an input voltage V L, a first terminal of the seventh resistor R7 is connected to a source of the first terminal of the second transistor Q5, a second terminal of the sixth terminal is grounded, a source terminal of the transistor Q1 is connected to the ground.
The eighth resistor R8 has a resistance of 0, the digital switch S1 turns on the second channel when receiving a control signal of low level, the low level outputs a high level through the first inverter U3, and outputs a low level through the second inverter U4, the high level output by the first inverter U3 is transmitted to the first transistor Q1, the first transistor Q1 is turned off, the low level output by the second inverter U4 is transmitted to the second transistor Q2, the second transistor Q2 is turned on, and the output voltage Vout follows the input voltage V L ED.
As shown in FIG. 6, the comparison unit comprises a comparator U1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein a first end of the first resistor R1 receives an input voltage V L ED, and a second end is connected with the input voltage V L EDAt the non-inverting input (pin 5) of comparator U1; a first end of the second resistor R2 receives the reference voltage Vref, and a second end is connected to the inverting input (pin 4) of the comparator U1; the first end of the fourth resistor R4 is connected to the intermediate node between the first resistor R1 and the comparator U1, and the second end is grounded; the power input terminal (pin 3) and the ground terminal (pin 1) of the comparator U1 are respectively connected with the working voltage V+And a ground; the first end of the third resistor R3 is connected with the working voltage V+And a second terminal is connected to the output terminal (pin 2) of the comparator U1.
The fourth resistor R4 is used for dividing voltage, and obtaining a positive phase input voltage compared with a reference voltage in a voltage dividing mode of an input voltage V L ED, the reference voltage Vref is 15V for example, the comparator U1 can be a single power supply or a double power supply, and the working voltage V+Available from power modules, such as: AVDD, VGH.
Fig. 7 shows a simulation circuit diagram of a voltage regulation circuit according to the present invention; fig. 8a to 8c show waveforms generated by simulation according to the schematic circuit diagram shown in fig. 7. With reference to fig. 7 to 8C, the simulation circuit diagram includes the utility model provides a voltage regulating circuit (with the circuit diagram shown in fig. 3, no longer repeated here) and oscilloscope, wherein oscilloscope is 4-channel oscilloscope XSC1, and output voltage Vout is received to the a channel, and input voltage is received to the B channel, and the output signal of comparator is received to the C channel, and the output signal of logic and gate is received to the D channel.
Illustratively, when the input voltage V L ED is 21V and the reference voltage Vref is 18V, the comparator U1 outputs a high level, the high level is transmitted to the digital switch S1 through the logic and gate U2, the digital switch S1 is controlled to turn on the first channel, the waveform of the oscilloscope XSC1 is as shown in fig. 8a, the channel B is the input voltage V L ED 21.000V and is shown in waveform 1, the channel a is the output voltage Vout 19.001V and is shown in waveform 2, the channel C is the output voltage 9.804V (high level) of the comparator U1 and is shown in waveform 3, the channel D is the output voltage of the logic and gate is 5.000V (high level) and is shown in waveform 4, as can be seen from fig. 8a, the voltage regulating circuit provided by the embodiment of the present invention, when the input voltage V L ED is greater than the reference voltage Vref, the output voltage Vout is equal to the input voltage V L ED-2V.
When the input voltage V L ED is 18V and the reference voltage Vref is 18V, the comparator U1 outputs a high level, the high level is transmitted to the digital switch S1 through the logic and gate U2, the digital switch S1 is controlled to switch on the first channel, the waveform diagram of the oscilloscope XSC1 is shown in fig. 8B, the channel B is the input voltage V L ED is 18.000V, and is shown in the waveform 1, the channel a is the output voltage Vout 15.998V, and is shown in the waveform 2, the channel C is the output voltage 9.990V (high level) of the comparator U1, and is shown in the waveform 3, the channel D is the output voltage of the logic and gate 5.000V (high level), and is shown in the waveform 4, as can be seen from fig. 8B, the voltage regulating circuit provided by the embodiment of the present invention, when the input voltage V L ED is the reference voltage Vref, and the output voltage Vout is (the input voltage V L ED-2) V.
When the input voltage V L ED is 5V and the reference voltage Vref is 18V, the comparator U1 outputs a low level, the low level is transmitted to the digital switch S1 through the logic and gate U2, the digital switch S1 is controlled to switch on the second channel, the waveform of the oscilloscope XSC1 is shown in fig. 8C, the channel B is input voltage V L ED is 5.000V, the waveform 1 is shown, the channel a is output voltage Vout is 5.000V, the waveform 2 is shown, the channel C is output voltage 39.769mV (low level) of the comparator U1, the waveform 3 is shown, the channel D is output voltage of the logic and gate is 0.000V (high level), and the waveform 4 is shown, as can be seen from fig. 8C, the voltage regulating circuit provided by the embodiment of the present invention, when the input voltage V L ED < the reference voltage Vref, the output voltage follows the input voltage V L ED.
The utility model provides a voltage regulating circuit adjusts input voltage according to control signal in order to obtain output signal, is the high level when control signal, and input voltage produces 2V's pressure drop and obtains output voltage, and when control signal be the low level, output voltage will follow input voltage. And then the utility model provides an among the drive circuit in a poor light through setting up above-mentioned voltage regulation circuit, can avoid when the backlight is less than 8 cluster lamps, output voltage is greater than input voltage because of stepping up, satisfies the design demand, increases the design multi-purpose, and digital circuit is simple, and the cost is lower, and low power dissipation can be integrated on a chip.
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 an element inherent to an article or device that comprises a list of elements does not include other elements not expressly listed. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of another like element in the inclusion of the item or device.
The embodiments of the invention are described above, and these embodiments do not set forth any exhaustive details, nor do they limit the invention to the specific 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 protection scope of the present invention should be subject to the scope defined by the claims of the present invention.
Claims (10)
1. A voltage regulation circuit, comprising:
the comparison unit comprises a comparator, the positive phase input end and the negative phase input end of the comparator respectively receive the input voltage and the reference voltage provided by the power module, and the output end of the comparator generates a control signal; and the number of the first and second groups,
and the voltage regulating unit is connected with the output end of the comparison unit to receive the control signal and is used for taking the input voltage or the voltage subjected to voltage reduction processing of the input voltage as output voltage according to the control signal.
2. The voltage regulation circuit of claim 1, wherein the comparison unit further comprises:
a first resistor, a first end of which receives an input voltage and a second end of which is connected with a non-inverting input end of the comparator;
a second resistor, a first end of the second resistor receiving a reference voltage, a second end of the second resistor being connected to an inverting input terminal of the comparator;
and the first end of the third resistor receives a power supply voltage, and the second end of the third resistor is connected with the output end of the comparator.
3. The voltage regulation circuit of claim 1, wherein the comparison unit further comprises:
a first resistor, a first end of which receives an input voltage and a second end of which is connected with a non-inverting input end of the comparator;
a second resistor, a first end of the second resistor receiving a reference voltage, a second end of the second resistor being connected to an inverting input terminal of the comparator;
a first end of the third resistor receives a power supply voltage, and a second end of the third resistor is connected with an output end of the comparator;
and a first end of the fourth resistor is connected to the middle node of the second resistor and the comparator, and a second end of the fourth resistor is grounded.
4. The voltage regulation circuit of claim 1, wherein the voltage regulation unit comprises:
the digital switch comprises a control end, a normal phase input end, an inverse phase input end, a first output end and a second output end, wherein the control end is connected with the output end of the comparator to receive the control signal, the normal phase input end is connected with and receives the input voltage, the inverse phase input end is grounded, and the second output end is used as the output end of the voltage regulating unit; and
a voltage stabilizing diode, the cathode of which is connected with the first output end of the digital switch, and the anode of which is used as the output end of the voltage regulating unit,
the control signal is used for controlling the normal phase input end to be communicated with one of the first output end or the second output end.
5. The voltage regulation circuit of claim 4, further comprising:
and a first end of the fifth resistor is connected with the output end of the voltage regulating unit, and a second end of the fifth resistor is grounded.
6. The voltage regulation circuit of claim 1, further comprising: and the first input end and the second input end of the logic AND gate are connected with the output end of the comparator, and the output end of the logic AND gate is used as the output end of the comparison unit.
7. The voltage regulation circuit of claim 4, wherein the digital switch comprises:
the digital switch comprises a first transistor and a second transistor, wherein the grid electrode of the first transistor is connected with the grid electrode of the second transistor and is used as the control end of the digital switch, the drain electrode of the first transistor is connected with the drain electrode of the second transistor and is used as the non-inverting input end of the digital switch, the source electrode of the first transistor is used as the first output end of the digital switch, the source electrode of the second transistor is used as the second output end of the digital switch, and the first transistor and the second transistor are different in type.
8. The voltage regulation circuit of claim 4, wherein the digital switch comprises:
the input end of the second inverter is connected with the output end of the comparator; and
the gate of the first transistor is connected with the output end of the comparator, the gate of the second transistor is connected with the output end of the second inverter, the drain of the first transistor is connected with the drain of the second transistor and serves as the non-inverting input end of the digital switch, the source of the first transistor serves as the first output end of the digital switch, the source of the second transistor serves as the second output end of the digital switch, and the first transistor and the second transistor are of the same type.
9. The voltage regulation circuit of claim 8, further comprising:
and the input end of the first phase inverter is connected with the output end of the comparator, and the output end of the first phase inverter is connected with the middle node between the grid of the first transistor and the input end of the second phase inverter.
10. A backlight driving circuit, comprising:
the voltage regulating circuit of any one of claims 1-9, and a driver module and a power module coupled thereto, the power module supplying power to the voltage regulating circuit, the driver module receiving an output voltage provided at an output of the voltage regulating circuit, the output voltage serving as a driving voltage for driving a backlight display.
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| CN202020217612.7U CN211181607U (en) | 2020-02-27 | 2020-02-27 | Voltage regulating circuit and backlight driving circuit |
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| CN202020217612.7U CN211181607U (en) | 2020-02-27 | 2020-02-27 | Voltage regulating circuit and backlight driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112153784A (en) * | 2020-10-20 | 2020-12-29 | 维沃移动通信有限公司 | Control circuit and electronic device |
| US11763760B1 (en) | 2022-04-02 | 2023-09-19 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
| WO2023184572A1 (en) * | 2022-04-02 | 2023-10-05 | Tcl华星光电技术有限公司 | Backlight module and display apparatus |
-
2020
- 2020-02-27 CN CN202020217612.7U patent/CN211181607U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112153784A (en) * | 2020-10-20 | 2020-12-29 | 维沃移动通信有限公司 | Control circuit and electronic device |
| US11763760B1 (en) | 2022-04-02 | 2023-09-19 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
| WO2023184572A1 (en) * | 2022-04-02 | 2023-10-05 | Tcl华星光电技术有限公司 | Backlight module and display apparatus |
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