CN219642137U - Reference voltage circuit, power management integrated circuit, driving module and display device - Google Patents
Reference voltage circuit, power management integrated circuit, driving module and display device Download PDFInfo
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Abstract
The utility model provides a reference voltage circuit, a power management integrated circuit, a driving module and a display device, wherein the reference voltage circuit comprises a reference voltage generation circuit, a band-stop filter circuit and an operational amplifier circuit, the band-stop filter circuit comprises a low-pass filter unit and a high-pass filter unit, the band-stop filter circuit carries out band-stop filtering on an input reference voltage signal, the amplifying circuit amplifies the band-stop filtered reference voltage signal and outputs the amplified signal to the display panel driving circuit, working voltage is provided for the display panel driving circuit, and the current frequency of the reference voltage signal avoids the audible range of human ears by adjusting the stop band width and the center frequency of the band-stop filter circuit, so that the noise of the reference voltage circuit is improved.
Description
Technical Field
The utility model belongs to the technical field of display, and particularly relates to a reference voltage circuit, a power management integrated circuit, a driving module and a display device.
Background
When a display device such as a notebook or a monitor is operated, a "creak" noise may be heard. This phenomenon is called "howling", and occurs because of passive elements such as capacitors, inductors, and the like. Among them, the power management integrated circuit inside the panel PCBA (Printed Circuit Board Assembly, printed wiring board assembly) is a main noise generating source, and the power management integrated circuit integrates various dc conversion circuits, and is turned ON/OFF by a switching device, thereby generating a pulse-like current. By controlling the length of time (pulse width) of ON, a stable direct current with constant voltage can be obtained. This system is called PWM (pulse width modulation), and is widely used as a main system of a dc conversion circuit. The switching frequency of the direct current-direct current conversion circuit is higher and reaches 100 kHz-1 MHz, and the frequency vibration is beyond the audible range of human ears, so that noise cannot be felt. However, due to some working scenarios, intermittent working, variable frequency working, light load or load working of the direct current-direct current conversion circuit causes periodic frequency acceptable to human ears, and howling occurs.
Among them, the reference voltage generating circuit in the power management integrated circuit is required to output the reference voltage signal AVDD to the plurality of driving units in the display panel driving circuit as a direct current converting circuit, and thus the AVDD is most loaded and the current is most correlated with the noise, and thus the noise of the reference voltage generating circuit generating the reference voltage AVDD is required to be improved.
Disclosure of Invention
The utility model aims to provide a reference voltage circuit, which aims to solve the problem of noise existing in the traditional reference voltage generation circuit.
A first aspect of an embodiment of the present utility model proposes a reference voltage circuit, the reference voltage circuit comprising:
a reference voltage generation circuit configured to generate a reference voltage signal;
the input end of the band-stop filter circuit is connected with the reference voltage generation circuit, the band-stop filter circuit comprises a low-pass filter unit and a high-pass filter unit, the low-pass filter unit is connected with the high-pass filter unit in parallel, the cut-off frequency of the low-pass filter unit is lower than that of the high-pass filter unit, and the band-stop filter circuit is configured to carry out band-stop filtering on the input reference voltage;
and the operational amplifier circuit is connected with the band-stop filter circuit and is used for carrying out signal amplification processing on the reference voltage after band-stop filtering and outputting the reference voltage to the display panel driving circuit.
Optionally, the reference voltage circuit further includes:
and the power-down protection circuit is connected with the output end of the operational amplifier circuit and is configured to discharge to the display panel driving circuit when the reference voltage generating circuit is powered down.
Optionally, the power-down protection circuit includes a first capacitor;
the first end of the first capacitor is connected with the output end of the operational amplifier circuit, and the second end of the first capacitor is grounded.
Optionally, the low-pass filtering unit includes a first resistor, a second resistor and a second capacitor;
the first end of the first resistor is used for inputting the reference voltage signal, the second end of the first resistor, the first end of the second resistor and the first end of the second capacitor are connected together, the second end of the second resistor is connected with the input end of the operational amplifier circuit, and the second end of the second capacitor is connected with a first reference voltage source.
Optionally, the high-pass filtering unit includes a third resistor, a third capacitor and a fourth capacitor;
the first end of the third capacitor is used for inputting the reference voltage signal, the second end of the third capacitor, the first end of the fourth capacitor and the first end of the third resistor are connected, the second end of the fourth capacitor is connected with the input end of the operational amplifier circuit, and the second end of the third resistor is connected with the output end of the operational amplifier circuit.
Optionally, the capacitance values of the third capacitor and the fourth capacitor are equal;
the resistance values of the first resistor and the second resistor are equal, and the ratio of the resistance value of the second resistor to the resistance value of the third resistor is 2.
Optionally, the operational amplifier circuit comprises a fourth resistor, a fifth resistor and an operational amplifier;
the first end of the fourth resistor is connected with a second reference voltage source, the second end of the fourth resistor, the first end of the fifth resistor and the inverting input end of the operational amplifier are connected, the non-inverting input end of the operational amplifier forms the input end of the operational amplifier circuit, and the output end of the operational amplifier and the second end of the fifth resistor are commonly connected to form the output end of the operational amplifier circuit.
A second aspect of an embodiment of the present utility model provides a power management integrated circuit comprising a reference voltage circuit as described above.
A third aspect of the embodiment of the present utility model provides a driving module, including a display panel driving circuit and the above-mentioned power management integrated circuit, where the power management integrated circuit is correspondingly connected to the display panel driving circuit.
A fourth aspect of the embodiment of the present utility model provides a display apparatus, including a display panel and a driving module as described above, where the driving module is correspondingly connected to the display panel.
Compared with the prior art, the embodiment of the utility model has the beneficial effects that: the reference voltage circuit comprises a reference voltage generating circuit, a band-stop filter circuit and an operational amplifier circuit, wherein the band-stop filter circuit carries out band-stop filtering on an input reference voltage signal, the amplifying circuit amplifies the band-stop filtered reference voltage signal and outputs the amplified reference voltage signal to the display panel driving circuit, working voltage is provided for the display panel driving circuit, and the current frequency of the reference voltage signal avoids the audible range of human ears by adjusting the stop band width and the center frequency of the band-stop filter circuit, so that the noise of the reference voltage circuit is improved.
Drawings
FIG. 1 is a schematic diagram of a reference voltage circuit according to an embodiment of the utility model;
FIG. 2 is a schematic diagram showing an amplitude-frequency characteristic of a band elimination filter circuit in the reference voltage circuit shown in FIG. 1;
FIG. 3 is a schematic diagram of a reference voltage circuit according to a second embodiment of the present utility model;
FIG. 4 is a schematic diagram of a reference voltage circuit according to a third embodiment of the present utility model;
fig. 5 is a schematic diagram of a first module of a driving module according to a fifth embodiment of the present utility model;
fig. 6 is a schematic diagram of a second module of the driving module according to the fifth embodiment of the present utility model;
fig. 7 is a schematic block diagram of a display device according to a sixth embodiment of the utility model.
Wherein, each reference sign in the figure is:
1. a driving module; 2. a display panel; 100. a reference voltage circuit; 200. a display panel driving circuit; 101. a power management integrated circuit; 10. a reference voltage generation circuit; 20. a band reject filter circuit; 21. a low-pass filtering unit; 22. a high-pass filtering unit; 30. an operational amplifier circuit; 40. a power-down protection circuit; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; c4, a fourth capacitor; u1, an operational amplifier; VREF1, a first reference voltage source; VREF2, a second reference voltage source.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
In a first aspect of the present utility model, a reference voltage circuit 100 is provided for outputting a reference voltage signal to a display panel driving circuit 200, providing an operating power supply for the display panel driving circuit 200, and correspondingly generating driving signals required by the display panel 2, such as a gamma voltage, a common electrode voltage, a source driving signal, etc., for the display panel 2 to display corresponding image information according to the received driving signals.
As shown in fig. 1, the reference voltage circuit 100 includes:
a reference voltage generation circuit 10 configured to generate a reference voltage signal;
the band-stop filter circuit 20, the input end of the band-stop filter circuit 20 is connected with the reference voltage generation circuit 10, the band-stop filter circuit 20 comprises a low-pass filter unit 21 and a high-pass filter unit 22, the low-pass filter unit 21 is connected with the high-pass filter unit 22 in parallel, the cut-off frequency of the low-pass filter unit 21 is lower than the cut-off frequency of the high-pass filter unit 22, and the band-stop filter circuit 20 is configured to carry out band-stop filtering on the input reference voltage;
and an operational amplifier circuit 30, wherein the operational amplifier circuit 30 is connected to the band-stop filter circuit 20, and is configured to amplify the band-stop filtered reference voltage and output the amplified reference voltage to the display panel driving circuit 200.
In this embodiment, the reference voltage generating circuit 10 performs dc-dc conversion on an input dc power supply and generates a reference voltage signal, where the reference voltage generating circuit 10 may select different types of dc conversion circuits according to the driving circuit requirements of different display panels 2, so as to output reference voltage signals with different voltage levels, and the reference voltage generating circuit 10 may select a BUCK circuit and/or a BOOST circuit to perform voltage conversion, which is not limited in specific type.
The band-stop filter circuit 20 is configured to perform band-stop filtering on the reference voltage signal output by the reference voltage generating circuit 10, where the low-pass filter unit 21 in the band-stop filter circuit 20 suppresses or attenuates the reference voltage signal higher than its cutoff frequency, and the high-pass filter unit 22 in the band-stop filter circuit 20 suppresses or attenuates the reference voltage signal lower than its cutoff frequency, and signals passing through the low-pass filter unit 21 and the high-pass filter unit 22 are subjected to signal superposition at the input end of the amplifying circuit, so that the reference voltage signal of the frequency in the middle range is attenuated to an extremely low level, and the band-stop filter function is implemented.
As shown in fig. 2, by adjusting the stop band width BW and the center frequency f 0 The current frequency of the reference voltage signal in the preset range can be band-reject filtered, so that the current frequency of the reference voltage signal avoids the audible range of human ears, and the noise of the reference voltage circuit 100 is improved.
Meanwhile, the reference voltage signal subjected to band elimination filtering is subjected to signal amplification processing through the operational amplifier circuit 30, so that the reference voltage signal corresponding to proportional amplification is output to the display panel driving circuit 200, and the display panel driving circuit 200 is ensured to receive the working voltage with the preset amplitude.
Compared with the prior art, the embodiment of the utility model has the beneficial effects that: the reference voltage circuit 100 is composed of a reference voltage generating circuit 10, a band-stop filter circuit 20 and an operational amplifier circuit 30, the band-stop filter circuit 20 performs band-stop filtering on an input reference voltage signal, and the amplifying circuit amplifies the band-stop filtered reference voltage signal and outputs the amplified signal to the display panel driving circuit 200, so as to provide an operating voltage for the display panel driving circuit 200, and the stop band width and the center frequency of the band-stop filter circuit 20 are adjusted, so that the current frequency of the reference voltage signal avoids the audible range of human ears, and the noise of the reference voltage circuit 100 is improved.
Example two
Based on the optimization of the first embodiment, in order to improve the operational reliability of the display panel driving circuit 200 and the display panel 2 and avoid the problem of data loss caused by power failure, as shown in fig. 3, optionally, the reference voltage circuit 100 further includes:
and a power-down protection circuit 40, the power-down protection circuit 40 being connected to an output terminal of the operational amplifier circuit 30, the power-down protection circuit 40 being configured to discharge to the display panel driving circuit 200 when the reference voltage generating circuit 10 is powered down.
In this embodiment, when the reference voltage generating circuit 10 normally inputs a dc power supply, the generated reference voltage signal is output to the display panel driving circuit 200 after being band-reject filtered and amplified, so as to ensure that the display panel driving circuit 200 and the rear display panel 2 work normally.
And when the reference voltage generating circuit 10 is powered down, the band elimination filter circuit 20 and the operational amplifier circuit 30 have no reference voltage signal input and output, at this time, the power-down protection circuit 40 performs discharging operation, and the rear display panel driving circuit 200 is ensured to continue to operate for a preset period of time, so that data storage and other operations before power failure are performed.
In order to reduce the design cost and simplify the overall structure of the power management circuit, as shown in fig. 4, the power-down protection circuit 40 may adopt an energy storage structure such as a storage battery and a capacitor, and optionally, the power-down protection circuit 40 includes a first capacitor C1, a first end of the first capacitor C1 is connected to an output end of the operational amplifier circuit 30, and a second end of the first capacitor C1 is grounded.
When the reference voltage generating circuit 10 normally inputs a dc power supply, the generated reference voltage signal is output to the display panel driving circuit 200 after being band-reject filtered and amplified, so that the display panel driving circuit 200 and the rear display panel 2 are ensured to work normally, and meanwhile, the first capacitor C1 performs charging and energy storage.
And when the reference voltage generating circuit 10 is powered down, the band elimination filter circuit 20 and the operational amplifier circuit 30 have no reference voltage signal input and output, at this time, the first capacitor C1 performs discharging operation, so as to ensure that the rear display panel driving circuit 200 continues to operate for a preset period of time, thereby performing operations such as data storage before power failure, wherein the capacitance value of the first capacitor C1 can be specifically determined according to the rear load level and the magnitude of the reference voltage signal.
Example III
Refinement and optimization are performed on the basis of the first embodiment, and optionally, the low-pass filtering unit 21 includes a first resistor R1, a second resistor R2, and a second capacitor C2;
the first end of the first resistor R1 is used for inputting a reference voltage signal, the second end of the first resistor R1, the first end of the second resistor R2 and the first end of the second capacitor C2 are commonly connected, the second end of the second resistor R2 is connected with the input end of the operational amplifier circuit 30, and the second end of the second capacitor C2 is connected with the first reference voltage source.
The high-pass filtering unit 22 includes a third resistor R3, a third capacitor C3, and a fourth capacitor C4;
the first end of the third capacitor C3 is used for inputting a reference voltage signal, the second end of the third capacitor C3, the first end of the fourth capacitor C4 and the first end of the third resistor R3 are connected, the second end of the fourth capacitor C4 is connected with the input end of the operational amplifier circuit 30, and the second end of the third resistor R3 is connected with the output end of the operational amplifier circuit 30.
The operational amplifier circuit 30 includes a fourth resistor R4, a fifth resistor R5, and an operational amplifier U1;
the first end of the fourth resistor R4 is connected with a second reference voltage source, the second end of the fourth resistor R4 and the first end of the fifth resistor R5 are connected with the inverting input end of the operational amplifier U1, the non-inverting input end of the operational amplifier U1 forms the input end of the operational amplifier circuit 30, and the output end of the operational amplifier U1 and the second end of the fifth resistor R5 are commonly connected to form the output end of the operational amplifier circuit 30.
In this embodiment, the first resistor R1, the second resistor R2 and the second capacitor C2 form the low-pass filter unit 21, and when the frequency of the reference voltage signal is lower than the turning frequency fp1, the low-frequency signal is output through the first resistor R1 and the second resistor R2 because the capacitive reactance of the second capacitor C2 is large without shunt effect.
When the frequency of the reference voltage signal is higher than the turning frequency fp1, the capacitance of the second capacitor C2 is small, so that the high-frequency signal passing through the first resistor R1 is split by the second capacitor C2 without output, thereby achieving the low-pass purpose.
And the third resistor R3, the third capacitor C3 and the fourth capacitor C4 form the high-pass filter unit 22, when the frequency of the reference voltage signal is lower than fp2, the output is reduced due to the fact that the capacitance reactance of the third capacitor C3 is large, and the lower the frequency, the smaller the output. When the frequency is higher than fp2, the third capacitor C3 has a small capacitance, so that the reference voltage signal is not attenuated, and the high-pass filtering is realized, and the turning frequency of the high-pass filtering unit 22 is realized.
The signals passing through the low-pass filter unit 21 and the high-pass filter unit 22 are subjected to signal superposition at the input end of the amplifying circuit, so that the reference voltage signal of the frequency in the middle range is attenuated to an extremely low level, and the band-stop filter function is realized.
As shown in fig. 2, by adjusting the stop band width BW and the center frequency f 0 The current frequency of the reference voltage signal in the preset range can be band-reject filtered, so that the current frequency of the reference voltage signal avoids the audible range of human ears, and the noise of the reference voltage circuit 100 is improved.
In practical applications, the stop band width and the center frequency can be adjusted by adjusting the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3, and adjusting the capacitance values of the third capacitor C3 and the fourth capacitor C4.
Optionally, the capacitance values of the third capacitor C3 and the fourth capacitor C4 are equal;
the resistance values of the first resistor R1 and the second resistor R2 are equal, and the ratio of the resistance value of the second resistor R2 to the resistance value of the third resistor R3 is 2.
As shown in connection with FIGS. 2 and 4, the AVDD1 input is considered U i (s), the AVDD2 output is taken as U 0 (s) the passband magnification is
Transfer function of
Let the center frequencyThe voltage amplification is:
passband cut-off frequency:
width of the group belt:
wherein the method comprises the steps ofThe amplitude-frequency characteristics are different when the Q values are different.
Wherein the audible frequency range of the human ear is between 20Hz-20kHz, so that the bandwidth BW and the center frequency f of the group can be determined through the frequency range of 20Hz-20KHz 0 The specific resistance values of the fourth resistor R4 and the fifth resistor R5 of the circuit can be obtained by combining the formula (1) and the formula (7) at 9.99KHz, and meanwhile, the stop band width can be properly widened when the circuit is specifically used.
Example IV
The utility model also provides a power management integrated circuit, which comprises a reference voltage circuit 100, wherein the specific structure of the reference voltage circuit 100 refers to the above embodiment, and because the power management integrated circuit adopts all the technical schemes of all the embodiments, the power management integrated circuit at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here.
In this embodiment, the power management integrated circuit includes a reference voltage circuit 100, the reference voltage circuit 100 is used for outputting a reference voltage signal to the display panel driving circuit 200, the power management integrated circuit further includes a plurality of dc conversion circuits, for example, a dc conversion circuit for generating Vgh (thin film transistor on voltage) and Vgl (thin film transistor off voltage), and further includes a dc conversion circuit for generating a common electrode voltage for a common electrode of the display panel, and the specific composition of the power management integrated circuit can be set according to the functional requirements of the display panel 2 and the display panel driving circuit 200.
Example five
The present utility model also proposes a driving module 1, as shown in fig. 5, where the driving module 1 includes a display panel driving circuit 200 and a power management integrated circuit, and the specific structure of the power management integrated circuit refers to the above embodiment, and since the driving module 1 adopts all the technical solutions of all the embodiments, it has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The power management integrated circuit is correspondingly connected with the display panel driving circuit 200.
In this embodiment, the power management integrated circuit outputs the working power required by the display panel driving circuit 200, wherein, as shown in fig. 6, the display panel driving circuit 200 mainly includes a timing controller 350, a gamma circuit 310, a source driving circuit 320, a gate driving circuit 340 and a common electrode voltage circuit 330, the power management integrated circuit outputs digital voltage signals, reference voltage signals, common electrode voltage signals, vgh and Vgl, etc., the reference voltage signals are mainly output to the gamma circuit 310, the source driving circuit 320 and the common electrode voltage circuit 330, the digital voltage signals are mainly output to the timing controller 350, the gate driving circuit 340 and the source driving circuit 320, the timing controller 350 is respectively connected with the source driving circuit 320 and the gate driving circuit 340, and drives the source driving circuit 320 and the gate driving circuit 340 to respectively output data signals and row scanning signals to the display panel 2, and the common electrode voltage circuit 330 outputs common electrode voltages to the display panel 2, thereby driving the display panel 2 to display corresponding image information.
Example six
The utility model also provides a display device, as shown in fig. 7, the display device comprises a display panel 2 and a driving module 1, and the specific structure of the driving module 1 refers to the above embodiment, and since the display device adopts all the technical solutions of all the embodiments, at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The driving module 1 is correspondingly connected with the display panel 2.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. A reference voltage circuit, comprising:
a reference voltage generation circuit configured to generate a reference voltage signal;
the input end of the band-stop filter circuit is connected with the reference voltage generation circuit, the band-stop filter circuit comprises a low-pass filter unit and a high-pass filter unit, the low-pass filter unit is connected with the high-pass filter unit in parallel, the cut-off frequency of the low-pass filter unit is lower than that of the high-pass filter unit, and the band-stop filter circuit is configured to carry out band-stop filtering on an input reference voltage signal;
and the operational amplifier circuit is connected with the band-stop filter circuit and is used for carrying out signal amplification processing on the reference voltage after band-stop filtering and outputting the reference voltage to the display panel driving circuit.
2. The reference voltage circuit of claim 1, wherein the reference voltage circuit further comprises:
and the power-down protection circuit is connected with the output end of the operational amplifier circuit and is configured to discharge to the display panel driving circuit when the reference voltage generating circuit is powered down.
3. The reference voltage circuit of claim 2, wherein the power down protection circuit comprises a first capacitor;
the first end of the first capacitor is connected with the output end of the operational amplifier circuit, and the second end of the first capacitor is grounded.
4. The reference voltage circuit of claim 1, wherein the low pass filter unit comprises a first resistor, a second resistor, and a second capacitor;
the first end of the first resistor is used for inputting the reference voltage signal, the second end of the first resistor, the first end of the second resistor and the first end of the second capacitor are connected together, the second end of the second resistor is connected with the input end of the operational amplifier circuit, and the second end of the second capacitor is connected with a first reference voltage source.
5. The reference voltage circuit of claim 4 wherein said high pass filter unit comprises a third resistor, a third capacitor and a fourth capacitor;
the first end of the third capacitor is used for inputting the reference voltage signal, the second end of the third capacitor, the first end of the fourth capacitor and the first end of the third resistor are connected, the second end of the fourth capacitor is connected with the input end of the operational amplifier circuit, and the second end of the third resistor is connected with the output end of the operational amplifier circuit.
6. The reference voltage circuit of claim 5 wherein the capacitance values of the third capacitor and the fourth capacitor are equal;
the resistance values of the first resistor and the second resistor are equal, and the ratio of the resistance value of the second resistor to the resistance value of the third resistor is 2.
7. The reference voltage circuit of claim 1 wherein the op-amp circuit comprises a fourth resistor, a fifth resistor and an operational amplifier;
the first end of the fourth resistor is connected with a second reference voltage source, the second end of the fourth resistor, the first end of the fifth resistor and the inverting input end of the operational amplifier are connected, the non-inverting input end of the operational amplifier forms the input end of the operational amplifier circuit, and the output end of the operational amplifier and the second end of the fifth resistor are commonly connected to form the output end of the operational amplifier circuit.
8. A power management integrated circuit comprising a reference voltage circuit as claimed in any one of claims 1 to 7.
9. A driving module comprising a display panel driving circuit and the power management integrated circuit of claim 8, wherein the power management integrated circuit is correspondingly connected with the display panel driving circuit.
10. A display device, comprising a display panel and the driving module according to claim 9, wherein the driving module is correspondingly connected with the display panel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320421785.4U CN219642137U (en) | 2023-02-27 | 2023-02-27 | Reference voltage circuit, power management integrated circuit, driving module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320421785.4U CN219642137U (en) | 2023-02-27 | 2023-02-27 | Reference voltage circuit, power management integrated circuit, driving module and display device |
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| CN219642137U true CN219642137U (en) | 2023-09-05 |
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| CN202320421785.4U Active CN219642137U (en) | 2023-02-27 | 2023-02-27 | Reference voltage circuit, power management integrated circuit, driving module and display device |
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