CN113012611A - Voltage detection circuit, display device and display driving method thereof - Google Patents
Voltage detection circuit, display device and display driving method thereof Download PDFInfo
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- CN113012611A CN113012611A CN202110219216.7A CN202110219216A CN113012611A CN 113012611 A CN113012611 A CN 113012611A CN 202110219216 A CN202110219216 A CN 202110219216A CN 113012611 A CN113012611 A CN 113012611A
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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
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Abstract
The invention provides a voltage detection circuit, a display device and a display driving method thereof. The voltage detection circuit comprises a voltage division circuit unit, a detection circuit unit and a switch circuit unit; the voltage division circuit unit is used for dividing the voltage output by the power management chip to obtain a detection voltage; the detection circuit unit is used for comparing the detection voltage with the reference voltage and outputting a control signal; the enabling control end of the switch circuit unit is electrically connected to the output end of the detection circuit unit, wherein the enabling control end controls the input end of the switch circuit unit to be conducted with the first output end or the second output end according to the control signal output by the detection circuit unit. The invention solves the problem of voltage drop caused by overlong voltage line of the flip chip film by arranging a group of higher voltage and voltage detection circuits.
Description
Technical Field
The invention relates to the technical field of display, in particular to a voltage detection circuit, a display device and a display driving method thereof.
Background
As the size of the display panel is larger, the size of the XB (X Board, converter) required by the display panel is larger, and the converter is connected to the display panel through a COF (Chip On Film). As shown in fig. 1, which is a schematic diagram of a basic structure of a display device in the prior art, taking a 65-inch display panel as an example, one display panel 10 corresponds to 4 conversion plates 30, and each conversion plate 30 corresponds to 3 flip chips 20. Each of the flip-chip packages 20 requires the power management chip 40 to provide a VDD1V8 (1.8V) voltage, and since the length of the voltage line of the flip-chip package 20 near the edge region (far end) of the display panel 10 is too long relative to the length of the voltage line of the flip-chip package 20 near the middle region (near end) of the display panel 10, a large voltage drop exists at the far end relative to the near end, and there is not enough voltage (less than 1.8V) at the end of the voltage line at the far end, i.e., one set of voltages cannot satisfy the requirements of the near end and the far end at the same time, so that the current VDD1V8 needs to design two sets of voltages for supplying power, one set of voltages is 1.8V (for supplying power to the near end) and the other set is 2.0V (for supplying power. Therefore, it is necessary to improve this defect.
Disclosure of Invention
The embodiment of the invention provides a voltage detection circuit, which is used for solving the technical problem that in a display device in the prior art, due to the fact that voltage drops exist on voltage lines of a remote end of a chip on film in a overlong mode, the tail ends of the remote voltage lines do not have enough voltage, two groups of voltage need to be set for power supply, and production cost is increased.
An embodiment of the present invention provides a voltage detection circuit, including: the circuit comprises a voltage division circuit unit, a detection circuit unit and a switch circuit unit. The input end of the voltage division circuit unit is electrically connected with a power management chip of the display device, the voltage division circuit unit is used for dividing the voltage output by the power management chip to obtain detection voltage, and the output end of the voltage division circuit unit is used for outputting the detection voltage. One input end of the detection circuit unit is electrically connected to the output end of the voltage division circuit unit, the other input end of the detection circuit unit is electrically connected to the output end of the reference voltage, the detection circuit unit is used for comparing the detection voltage with the reference voltage, and the output end of the detection circuit unit is used for outputting a control signal. The power management circuit comprises a detection circuit unit, a switch circuit unit, a voltage reduction circuit unit, a display panel and an enable control end, wherein the enable control end of the switch circuit unit is electrically connected to the output end of the detection circuit unit, the input end of the switch circuit unit is electrically connected to the power management chip, the first output end of the switch circuit unit is electrically connected to the input end of the voltage reduction circuit unit, the output end of the voltage reduction circuit unit is electrically connected to the input end of the display panel, the second output end of the switch circuit unit is electrically connected to the input end of the display panel, and the enable control end controls the input end of the switch circuit unit to be conducted with the first output end or.
In the voltage detection circuit provided in the embodiment of the present invention, the voltage dividing circuit unit includes a first resistor and a second resistor connected in series between the voltage output by the power management chip and ground, and an intermediate node between the first resistor and the second resistor provides the detection voltage.
In the voltage detection circuit provided in the embodiment of the present invention, the first resistor and the second resistor are at least one of a fixed resistor and a digitally tunable resistor.
In the voltage detection circuit provided in the embodiment of the present invention, the detection circuit unit includes an operational amplifier, a non-inverting input terminal of the operational amplifier receives the detection voltage, an inverting input terminal of the operational amplifier receives the reference voltage, and an output terminal of the operational amplifier is electrically connected to an enable control terminal of the switch circuit unit.
In the voltage detection circuit provided in the embodiment of the present invention, the detection voltage is greater than or equal to the reference voltage, when the detection voltage is greater than the reference voltage, the output terminal of the detection circuit unit outputs a high level, and when the detection voltage is equal to the reference voltage, the output terminal of the detection circuit unit outputs a low level.
In the voltage detection circuit provided in the embodiment of the present invention, when the enable control terminal is at a high level, the switch circuit unit is in a closed state, and the input terminal of the switch circuit unit is connected to the first output terminal; when the enable control terminal is at a low level, the switch circuit unit is in a disconnected state, and the input terminal of the switch circuit unit is connected with the second output terminal.
In the voltage detection circuit provided by the embodiment of the invention, the voltage reduction circuit unit comprises a low dropout linear regulator or a step-down DC-DC converter.
The embodiment of the invention provides a display device, which comprises a display panel, at least one conversion plate and a power management chip, wherein each conversion plate is electrically connected with the display panel through a plurality of chip on films, and the voltage detection circuit is integrated on each chip on film.
An embodiment of the present invention further provides a display driving method of a display device, which is used for the display device, and the display driving method includes: the input end of a voltage division circuit unit of the voltage detection circuit receives the voltage output by the power management chip and divides the voltage output by the power management chip to obtain a detection voltage; the detection circuit unit of the voltage detection circuit compares the detection voltage with the reference voltage and outputs a control signal; and the switch circuit unit of the voltage detection circuit controls the input end of the switch circuit unit to be conducted with the first output end or the second output end according to the control signal output by the detection circuit unit.
In the display driving method of the display device provided by the embodiment of the invention, the detection voltage is greater than or equal to the reference voltage; when the detection voltage is larger than the reference voltage, the input end of the switch circuit unit is conducted with the first output end; when the detection voltage is equal to the reference voltage, the input end of the switch circuit unit is conducted with the second output end.
Has the advantages that: an embodiment of the present invention provides a voltage detection circuit, including: the voltage divider circuit unit, the detection circuit unit and the switch circuit unit; the voltage division circuit unit is used for dividing a group of higher voltages (more than 2.0V) output by the power management chip to obtain detection voltages; the detection circuit unit is used for comparing the detection voltage with a reference voltage so as to output a control signal; the switch circuit unit is used for switching a closed circuit according to the control signal, and when the detection voltage is greater than the reference voltage, the switch circuit unit is switched to a voltage reduction circuit unit circuit, so that the voltage output by the power management chip is reduced and then power supply is carried out; when the detection voltage is equal to the reference voltage, the circuit is switched to the output end circuit, and the voltage output by the power management chip is directly adopted for supplying power.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
Fig. 1 is a schematic diagram of a basic structure of a display device of the related art.
Fig. 2 is a circuit diagram of a voltage detection circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a basic structure of a display device according to an embodiment of the present invention.
Fig. 4 is a flowchart of a display driving method of a display device according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the size of components illustrated in the drawings is not to scale for clarity and ease of understanding and description.
As shown in fig. 2, which is a circuit diagram of a voltage detection circuit according to an embodiment of the present invention, the voltage detection circuit 50 includes: a voltage dividing circuit unit 501, a detection circuit unit 502, and a switching circuit unit 503.
The input end Vin of the voltage dividing circuit unit 501 is electrically connected to the power management chip 40 (as shown in fig. 3) of the display device, the voltage dividing circuit unit 501 is configured to divide the voltage output by the power management chip 40 to obtain a detection voltage Vdet, and the output end of the voltage dividing circuit unit 501 is configured to output the detection voltage Vdet. The voltage output by the power management chip 40 is greater than 2.0 volts, for example, 2.05 volts.
It should be noted that the output port of the power management chip 40 (as shown in fig. 3) refers to, in particular, the VDD1V8 port (not shown) on the power management chip 40, which should output 1.8V according to the conventional technology, but the present invention adjusts the voltage of the port so that the port outputs a higher voltage (greater than 2.0V).
One input end of the detection circuit unit 502 is electrically connected to the output end of the voltage division circuit unit 501, the other input end of the detection circuit unit 502 is electrically connected to the output end of the reference voltage Vref, the detection circuit unit 502 is used for comparing the detection voltage Vdet with the reference voltage Vref, and the output end of the detection circuit unit 502 is used for outputting a control signal.
The enable control terminal EM of the switch circuit unit 503 is electrically connected to the output terminal of the detection circuit unit 502, the input terminal of the switch circuit unit 503 is electrically connected to the power management chip 40 (see fig. 3), the first output terminal Vout1 of the switch circuit unit 503 is electrically connected to the input terminal of the step-down circuit unit 504, the output terminal Vout3 of the step-down circuit unit 504 is electrically connected to the input terminal of the display panel 10 (see fig. 3), and the second output terminal Vout2 of the switch circuit unit 503 is electrically connected to the input terminal of the display panel 10, wherein the enable control terminal EM controls the input terminal of the switch circuit unit 503 to be electrically connected to the first output terminal Vout1 or the second output terminal Vout2 according to the control signal output by the detection circuit unit 502.
It should be noted that the voltage detection circuit 50 provided in the embodiment of the present invention is integrated on the chip on film 20 (as shown in fig. 3), the power management chip 40 (as shown in fig. 3) transmits the voltage signal to the chip on film 20 through the voltage line of the chip on film 20, and the voltage line at the far end has a larger voltage drop due to the higher line resistance and line loss of the voltage line relative to the voltage line at the near end, so that the terminal voltage of the voltage line at the far end is lower than 1.8V, the embodiment of the present invention adjusts the output voltage of the power management chip 40, so that the power management chip 40 outputs a set of higher voltage (greater than 2.0V) to make the voltage of the voltage line at the far end after loss greater than or equal to 1.8V, and the voltage detection circuit 50 steps down the voltage greater than 1.8V and then supplies power to the chip on film 20, and directly supplies the voltage equal to 1.8V to the chip on film 20, through the mode that sets up a set of voltage power supply, both can solve the voltage drop problem of the voltage line of distal end, can not additionally increase too much manufacturing cost again, and the preparation mode is simple and convenient, can realize the volume production.
In one embodiment, the voltage divider circuit unit 501 includes a first resistor R1 and a second resistor R2 connected in series between the voltage output by the power management chip 40 (fig. 3) and ground, and the detection voltage Vdet is provided at an intermediate node between the first resistor R1 and the second resistor R2. Wherein the value of the reference voltage Vref is determined according to the ratio of the first resistor R1 to the second resistor R2, such as the voltage division ratio of the first resistor R1 to the second resistor R2 is 2: 1, the reference voltage Vref may be set to 0.6V.
In an embodiment, the first resistor R1 and the second resistor R2 are at least one of a fixed resistor and a digitally adjustable resistor, for example, the first resistor R1 and the second resistor R2 are both fixed resistors, the first resistor R1 and the second resistor R2 are both digitally adjustable resistors, the first resistor R1 and the second resistor R2 are respectively a fixed resistor and a digitally adjustable resistor, or the first resistor R1 and the second resistor R2 are respectively a digitally adjustable resistor and a fixed resistor.
In one embodiment, the detection circuit unit 502 includes an operational amplifier 505, a non-inverting input "+" of the operational amplifier 505 receives the detection voltage Vdet, an inverting input "-" of the operational amplifier 505 receives the reference voltage Vref, and an output of the operational amplifier 505 is electrically connected to the enable control terminal EM of the switching circuit unit 503.
The power supply connected to the operational amplifier 505 may be a dual power supply or a single power supply. In one embodiment, one voltage terminal Vd of the operational amplifier 505 is connected to a 3.3 v dc power source, and the other voltage terminal Vs is connected to ground.
It should be noted that, the amplification factor of an ideal operational amplifier is infinite, the input resistance is infinite, and the output resistance is zero, so as long as the input voltage at its input end is not zero, the output end will have an output voltage as high as the positive or negative power supply, which should be infinite high, but is limited by the power supply voltage, specifically, if the voltage input at the non-inverting input end "+" is higher than the voltage input at the inverting input end "-" and even if it is higher, the output end of the operational amplifier will output a voltage (i.e. high level) identical to the positive power supply voltage (i.e. the power supply voltage end Vd); if the voltage at the non-inverting input "+" is equal to the voltage at the inverting input "-" the output voltage is zero (i.e., low).
In one embodiment, the detection voltage Vdet is greater than or equal to the reference voltage Vref, and when the detection voltage Vdet is greater than the reference voltage Vref, the output terminal of the detection circuit unit 502 outputs a high level, and when the detection voltage Vdet is equal to the reference voltage Vref, the output terminal of the detection circuit unit 502 outputs a low level.
It should be noted that the detection voltage Vdet is obtained by dividing the voltage output by the power management chip 40 (as shown in fig. 3), and in order to satisfy the requirement that the voltage at the ends of the voltage lines of all the flip chips is greater than or equal to 1.8v, the detection voltage Vdet on any one of the flip chips is greater than or equal to the reference voltage Vref, where the value of the reference voltage Vref is determined according to the divided value when the input terminal Vin of the voltage division circuit unit 501 is 1.8 v.
In one embodiment, the switch circuit unit 503 includes a closed state and an open state. When the enable control terminal EM is at a high level, the switch circuit unit 503 is in a closed state, and the input terminal of the switch circuit unit 503 is conducted with the first output terminal Vout 1; when the enable control terminal EM is at a low level, the switch circuit unit 503 is in an off state, the input terminal of the switch circuit unit 503 is connected to the second output terminal Vout2, that is, the switch circuit unit is active at a low level.
It should be noted that, a switch is a broad ideal switch, which is normally closed, i.e. always keeps high, and when it is given low (i.e. opens the switch), the switch will trigger the next circuit.
It can be understood that the detection voltage Vdet provided by the embodiment of the present invention may only be greater than or equal to the reference voltage Vref, that is, the detection voltage Vdet is greater than the reference voltage Vref in a normal state, and when the detection voltage Vdet is equal to the reference voltage Vref, the voltage does not need to be decreased, so that the switch needs to be turned off, and the input terminal and the second output terminal Vout2 are directly connected to supply power.
In one embodiment, the voltage reduction circuit unit 504 includes a Low Dropout Regulator (LDO) or a buck DC-DC converter.
It should be noted that the low dropout regulator is a micro SoC (System on Chip) with low power consumption. The structure of the device mainly comprises a starting circuit, a constant current source bias unit, an enabling circuit, an adjusting element, a reference source, an error amplifier, a feedback resistance network, a protection circuit and the like. The basic working principle is as follows: the system is powered up, if the enable pin is at high level, the circuit starts to start, the constant current source circuit provides bias for the whole circuit, the reference source voltage is quickly established, the output continuously rises along with the input, when the output is about to reach the specified value (1.8V), the output feedback voltage obtained by the feedback network is also close to the reference voltage value, at the moment, the error amplifier amplifies the small error signal between the output feedback voltage and the reference voltage and then amplifies the small error signal to the output through the adjusting tube, thereby forming negative feedback, ensuring that the output voltage is stabilized on the specified value (1.8V), and similarly, if the input voltage or the output current changes, the closed loop keeps the output voltage unchanged at 1.8V.
Next, please refer to fig. 3, which is a schematic diagram of a basic structure of a display device according to an embodiment of the present invention, where the display device includes a display panel 10, at least one converter 30, and a power management chip 40, each converter 30 is electrically connected to the display panel 10 through a plurality of flip-chip films 20, the voltage detection circuit 50 is integrated on each flip-chip film 20, and a detailed structure and a working principle of the voltage detection circuit 50 are please refer to fig. 2 and related descriptions, which are not described herein again. The display device provided by the embodiment of the invention can be as follows: products or components with display functions such as mobile phones, tablet computers, notebook computers, digital cameras, navigators and the like.
It should be noted that, in the present invention, the output voltage of the power management chip 40 is adjusted to enable the power management chip 40 to output a group of higher voltages (greater than 2.0V), so that the voltage of the voltage line at the far end after being lost is greater than or equal to 1.8V, the voltage greater than 1.8V is reduced by the voltage detection circuit 50 to supply power to the chip on film 20, and the voltage equal to 1.8V is directly supplied to the chip on film 20, that is, the present invention only needs to set one group of voltage for power supply (without setting two groups of voltage for power supply), which can solve the problem of voltage drop of the voltage line at the far end and save the production cost.
Referring to fig. 4, a flowchart of a display driving method of a display device according to an embodiment of the present invention is shown, where the display driving method is used for the display device, and the display driving method includes:
s601, receiving the voltage output by the power management chip and dividing the voltage output by the power management chip to obtain a detection voltage by the input end of a voltage dividing circuit unit of the voltage detection circuit;
s602, comparing the detection voltage with a reference voltage by a detection circuit unit of the voltage detection circuit, and outputting a control signal;
and S603, the switch circuit unit of the voltage detection circuit controls the input end of the switch circuit unit to be conducted with the first output end or the second output end according to the control signal output by the detection circuit unit.
Wherein the detection voltage is greater than or equal to the reference voltage; when the detection voltage is larger than the reference voltage, the input end of the switch circuit unit is conducted with the first output end; when the detection voltage is equal to the reference voltage, the input end of the switch circuit unit is conducted with the second output end.
In summary, an embodiment of the present invention provides a voltage detection circuit, which includes: the voltage divider circuit unit, the detection circuit unit and the switch circuit unit; the voltage division circuit unit is used for dividing a group of higher voltages (more than 2.0V) output by the power management chip to obtain detection voltages; the detection circuit unit is used for comparing the detection voltage with a reference voltage so as to output a control signal; the switch circuit unit is used for switching a closed circuit according to the control signal, and when the detection voltage is greater than the reference voltage, the switch circuit unit is switched to a voltage reduction circuit unit circuit, so that the voltage output by the power management chip is reduced and then power supply is carried out; when the detection voltage is equal to the reference voltage, the detection circuit is switched to an output end circuit, and the voltage output by the power management chip is directly adopted for supplying power.
The voltage detection circuit, the display device and the display driving method thereof according to the embodiments of the present invention are described in detail above. It should be understood that the exemplary embodiments described herein should be considered merely illustrative for facilitating understanding of the method of the present invention and its core ideas, and not restrictive.
Claims (10)
1. A voltage detection circuit, comprising:
the input end of the voltage division circuit unit is electrically connected with a power management chip of the display device, the voltage division circuit unit is used for dividing the voltage output by the power management chip to obtain a detection voltage, and the output end of the voltage division circuit unit is used for outputting the detection voltage;
one input end of the detection circuit unit is electrically connected to the output end of the voltage division circuit unit, the other input end of the detection circuit unit is electrically connected to the output end of the reference voltage, the detection circuit unit is used for comparing the detection voltage with the reference voltage, and the output end of the detection circuit unit is used for outputting a control signal;
the power supply comprises a detection circuit unit, a switch enable control end of the switch circuit unit, an input end of the switch circuit unit, a first output end of the switch circuit unit, an output end of the step-down circuit unit and a second output end of the switch circuit unit, wherein the enable control end of the switch circuit unit is electrically connected to the output end of the detection circuit unit, the input end of the switch circuit unit is electrically connected to the input end of the step-down circuit unit, the output end of the step-down circuit unit is electrically connected to the input end of the display panel, and the second output end of the switch circuit unit is.
2. The voltage detection circuit of claim 1, wherein the voltage divider circuit unit comprises a first resistor and a second resistor connected in series between the voltage output by the power management chip and ground, and an intermediate node of the first resistor and the second resistor provides the detection voltage.
3. The voltage detection circuit of claim 2, wherein the first resistor and the second resistor are at least one of a fixed resistor and a digitally adjustable resistor.
4. The voltage detection circuit of claim 1, wherein the detection circuit unit comprises an operational amplifier, a non-inverting input of the operational amplifier receives the detection voltage, an inverting input of the operational amplifier receives the reference voltage, and an output of the operational amplifier is electrically connected to the enable control terminal of the switching circuit unit.
5. The voltage detection circuit of claim 4, wherein the detection voltage is greater than or equal to the reference voltage, wherein the output terminal of the detection circuit unit outputs a high level when the detection voltage is greater than the reference voltage, and outputs a low level when the detection voltage is equal to the reference voltage.
6. The voltage detection circuit of claim 5, wherein when the enable control terminal is at a high level, the switch circuit unit is in a closed state, and the input terminal of the switch circuit unit is conducted with the first output terminal;
when the enable control terminal is at a low level, the switch circuit unit is in a disconnected state, and the input terminal of the switch circuit unit is connected with the second output terminal.
7. The voltage detection circuit of claim 1, wherein the voltage reduction circuit unit comprises a low dropout regulator or a buck DC-DC converter.
8. A display device, comprising a display panel, at least one converter board and a power management chip, wherein each converter board is electrically connected to the display panel through a plurality of flip-chips, and each flip-chip has a voltage detection circuit according to any one of claims 1 to 7 integrated thereon.
9. A display driving method for a display device according to claim 8, comprising the steps of:
the input end of a voltage division circuit unit of the voltage detection circuit receives the voltage output by the power management chip and divides the voltage output by the power management chip to obtain a detection voltage;
the detection circuit unit of the voltage detection circuit compares the detection voltage with the reference voltage and outputs a control signal;
and the switch circuit unit of the voltage detection circuit controls the input end of the switch circuit unit to be conducted with the first output end or the second output end according to the control signal output by the detection circuit unit.
10. The display driving method of a display device according to claim 9, wherein the detection voltage is greater than or equal to the reference voltage;
when the detection voltage is larger than the reference voltage, the input end of the switch circuit unit is conducted with the first output end;
when the detection voltage is equal to the reference voltage, the input end of the switch circuit unit is conducted with the second output end.
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| CN109637457A (en) * | 2019-02-14 | 2019-04-16 | 成都京东方光电科技有限公司 | Pixel circuit, display panel and display device |
| CN110989755A (en) * | 2019-11-26 | 2020-04-10 | Tcl华星光电技术有限公司 | Power supply control circuit and display device |
| CN111028754A (en) * | 2019-12-06 | 2020-04-17 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
| CN111179873A (en) * | 2020-02-19 | 2020-05-19 | 京东方科技集团股份有限公司 | Shutdown noise reduction circuit, shutdown noise reduction chip and display device |
| CN111897387A (en) * | 2020-08-07 | 2020-11-06 | 珠海智融科技有限公司 | Linear low-dropout voltage conversion circuit and working method thereof, power supply device and working method thereof |
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