CN112700744B - Display panel - Google Patents
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- CN112700744B CN112700744B CN202110013287.1A CN202110013287A CN112700744B CN 112700744 B CN112700744 B CN 112700744B CN 202110013287 A CN202110013287 A CN 202110013287A CN 112700744 B CN112700744 B CN 112700744B
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The application discloses display panel, display panel includes voltage input unit, drive unit and undervoltage protection unit, and the undervoltage protection unit includes: the voltage division unit is used for connecting the driving voltage and outputting a feedback voltage; the comparison unit is used for comparing a feedback voltage with a plurality of reference voltages and outputting a comparison result; and the logic processing unit is used for cutting off the driving voltage when the voltage value of the driving voltage is less than a preset value and lasts for a preset time corresponding to the comparison result. The feedback voltage is compared with a plurality of different reference voltages, different preset time is determined according to different comparison results, the more the driving voltage reduction degree is achieved, the shorter the time for triggering protection to cut off the driving voltage is, the time for triggering protection can be adjusted according to the actual condition of the driving voltage, and the driving IC is prevented from being damaged due to continuous working of the driving IC under the serious short circuit condition.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel.
Background
In the driving process of a display panel (e.g., a liquid crystal display panel), a problem often encountered is that an electrostatic shock occurs inside a driving IC receiving an input Voltage, which causes a PMIC (Power Management IC) to trigger an OCP (Over Current Protection) and an UVP (Under Voltage Protection).
The drive IC in the display panel is in a low-voltage drive state for a long time and can damage components such as the drive IC, and the UVP protection mechanism is as follows: when the driving voltage is smaller than the set voltage and the time is long, the protection is triggered to cut off the driving voltage, so that the driving IC and other components are protected.
However, in this protection scheme, if the short circuit condition of the driver IC is severe, the driving voltage of the driver IC is low, and it takes a certain time to trigger the UVP protection, which may cause the driver IC to be damaged.
Disclosure of Invention
The embodiment of the application provides a display panel, so as to solve the technical problem that in the existing display panel adopting the UVP protection mechanism, if the short circuit condition of a drive IC is serious, the drive voltage of the drive IC is very low, and a certain time is needed for triggering the UVP protection, so that the drive IC may be damaged.
In order to solve the problems, the technical scheme provided by the invention is as follows:
a display panel, the display panel comprising:
the voltage input unit is used for providing a driving voltage;
the input end of the driving unit is connected with the driving voltage;
the undervoltage protection unit comprises a voltage division unit, a comparison unit and a logic processing unit;
the voltage division unit is used for accessing the driving voltage and outputting a feedback voltage, and the feedback voltage is smaller than the driving voltage; the comparison unit is used for comparing a feedback voltage with a plurality of reference voltages and outputting a comparison result; the logic processing unit is used for cutting off the driving voltage when the voltage value of the driving voltage is smaller than a preset value and lasts for preset time corresponding to the comparison result, and the voltage value of the reference voltage is smaller than or equal to the preset value.
In some embodiments, the under-voltage protection unit includes at least two independent comparators, a first input terminal of each comparator is connected to a reference voltage, a second input terminal of each comparator is connected to the feedback voltage, an output terminal of each comparator is connected to an input terminal of the logic processing unit, and an output terminal of the logic processing unit is connected to an input terminal of the driving unit.
In some embodiments, the voltage dividing unit includes a first resistor and a second resistor connected in series, a first end of the first resistor is connected to the driving voltage, and a second end of the first resistor, a first end of the second resistor, and a second input end of the comparator are connected to a node for outputting the feedback voltage; and the second end of the second resistor is grounded.
In some embodiments, the voltage values of all of the reference voltages are in an arithmetic progression.
In some embodiments, the voltage value of the reference voltage is 0.2-0.8 times the set value of the driving voltage.
In some embodiments, the preset time is inversely related to a voltage value of the feedback voltage.
In some embodiments, when the voltage value of the reference voltage accessed by the comparator is greater than the voltage value of the feedback voltage, the comparator outputs a first comparison result, and the preset time is inversely proportional to the number of comparators outputting the first comparison result.
In some embodiments, the voltage input unit includes a variable resistor, a first terminal of the variable resistor is connected to the input terminal of the voltage dividing unit, and a second terminal of the variable resistor is grounded.
In some embodiments, the voltage input unit further includes a boost inductor and a boost diode, a first end of the boost inductor is connected to an input voltage, a second end of the boost inductor is connected to an anode of the boost diode, and a cathode of the boost diode is connected to the first end of the variable resistor and the input end of the voltage dividing unit.
In some embodiments, the voltage input unit further includes a capacitor, a first end of the capacitor is connected to a cathode of the diode, and a second end of the capacitor is connected to a second end of the variable resistor.
The beneficial effects of the invention application are as follows: the feedback voltage is compared with a plurality of different reference voltages, different preset time is determined according to different comparison results, the more the driving voltage reduction degree is achieved, the shorter the time for triggering protection to cut off the driving voltage is, the time for triggering protection can be adjusted according to the actual condition of the driving voltage, and the driving IC is prevented from being damaged due to continuous working of the driving IC under the serious short circuit condition.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 2 is a circuit schematic diagram of an under-voltage protection circuit according to an embodiment of the present application.
Reference numerals:
10. a voltage input unit; 20. a power management unit; 21. an undervoltage protection unit; 211. a voltage dividing unit; 212. a comparison unit; 212a, a comparator; 213. a logic processing unit; 22. an overcurrent protection unit; 30. a drive unit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The invention aims at the technical problems that in the existing display panel adopting the UVP protection mechanism, if the short circuit condition of a drive IC is serious, the drive voltage of the drive IC is very low, and a certain time is needed for triggering the UVP protection, so that the drive IC can be damaged.
The present application provides a display panel, as shown in fig. 1, including a voltage input unit 10, a power management unit 20, and a driving unit 30.
The voltage input unit 10 is configured to provide a driving voltage Vd; the input end of the power management unit 20 is connected to the voltage input unit 10 to access the driving voltage Vd, the output end of the power management unit 20 is connected to the driving unit 30 to transmit the driving voltage Vd to the driving unit 30, and the driving unit 30 is configured to drive the display panel to display.
Specifically, the power management unit 20 includes an under-voltage protection unit 21 and an over-current protection unit 22.
The undervoltage protection unit 21 is configured to cut off the driving voltage Vd when the voltage value of the driving voltage Vd is smaller than a preset value and lasts for a preset time, that is, to cut off the conduction between the voltage input unit 10 and the driving unit 30; the preset value is smaller than and related to the set value of the driving voltage Vd, and the set value of the driving voltage Vd may be determined according to the voltage value of the voltage required by the driving unit 30, and if the driving unit 30 requires 10 volts for driving, the set value of the driving voltage of the driving unit 30 is 10, and the preset value may be 8.
The overcurrent protection unit 22 is configured to limit the driving current of the driving unit 30 not to exceed a limit value, and cut off the driving current when the driving current exceeds the limit value. The limit value of the driving current may be determined according to a current value of the current required by the driving unit 30, and if the driving unit 30 requires a current of 0.5 a for driving, the set value of the driving unit 30 is 0.5.
Specifically, the voltage input unit 10 includes a variable resistor Rv, a first end of the variable resistor Rv is connected to the input end of the voltage dividing unit 211, and a second end of the variable resistor Rv is grounded.
It can be understood that the resistance value of the variable resistor Rv may vary according to the magnitude of the input voltage Vin, the potential of the input end of the undervoltage protection unit 21 is the same as the potential of the first end of the variable resistor Rv, the potential value of the potential of the input end of the undervoltage protection unit 21 is the same as the voltage value of the driving voltage Vd, and the more serious the short-circuit condition of the variable resistor Rv is, the smaller the voltage value of the driving voltage Vd is.
In an embodiment, the voltage input unit 10 further includes a boost inductor L and a boost diode D, a first end of the boost inductor L is connected to an input voltage Vin, a second end of the boost inductor L is connected to an anode of the boost diode D, and a cathode of the boost diode D is connected to the first end of the variable resistor Rv and the input end of the voltage dividing unit 211.
It can be understood that the input voltage Vin is a pulse signal, the boost inductance coil L continuously stores and releases energy circularly when being connected to the input voltage Vin, the current output by the boost inductance coil L flows to the first end of the variable resistor Rv after being rectified by the boost diode D, the driving voltage Vd is formed at the first end of the variable resistor Rv, and the voltage value of the driving voltage Vd is higher than that of the input voltage Vin, so that the boost diode D can ensure unidirectional conduction of the current and avoid reverse flow of the current.
In an embodiment, the voltage input unit 10 further includes a capacitor C, a first end of the capacitor C is connected to a negative electrode of the diode D, and a second end of the capacitor C is connected to a second end of the variable resistor Rv, that is, the second end of the capacitor C is grounded.
In an embodiment, the voltage input unit 10 further includes a transistor T, a first end of the transistor T is connected to a second end of the boost inductor L, a second end of the transistor T is connected to an input end of the over-current protection unit 22, and an output end of the over-current protection unit 22 is connected to a gate of the transistor T.
It can be understood that the transistor T is turned on and off in a cycle, so that the boost inductor L continuously and cyclically stores and releases energy, and the overcurrent protection unit 22 limits the current output by the boost inductor L not to exceed a limit value, i.e. the overcurrent protection unit 22 limits the driving current of the driving unit 30 not to exceed the limit value, and cuts off the driving current when the driving current is too high.
In an embodiment, the voltage input unit 10 further includes a protection resistor Rp, a first end of the protection resistor Rp is connected to the second end of the transistor T and the input end of the over-current protection unit 22, and a second end of the protection resistor Rp is grounded.
As shown in fig. 2, the under-voltage protection unit 21 includes a voltage dividing unit 211, a comparing unit 212, and a logic processing unit 213.
Specifically, the voltage dividing unit 211 is configured to access the driving voltage Vd and output a feedback voltage Vr, where the feedback voltage Vr is smaller than the driving voltage Vd; the comparing unit 212 is configured to compare a feedback voltage Vr with a plurality of reference voltages Vref (e.g., Vref1, Vref2, Vref3, and Vref4 in fig. 2), and output a comparison result; the logic processing unit 213 is configured to cut off the driving voltage Vd when the voltage value of the driving voltage Vd is less than a preset value and lasts for a preset time corresponding to the comparison result, and the voltage value of the reference voltage Vref is less than or equal to the preset value.
It should be noted that the preset time is determined according to all comparison results, the driving voltage Vd is divided by the voltage dividing unit 211 to form a feedback voltage Vr, the comparing unit 212 compares the feedback voltage Vr with a plurality of different reference voltages Vref, since the voltage values of all the reference voltages Vref are different, a plurality of comparison results may occur, and the logic processing unit 213 determines the preset time according to all the comparison results, where different comparison results correspond to different preset times.
It is understood that, if the voltage value of the feedback voltage Vr is greater than the voltage values of all the reference voltages Vref, the logic processing unit 213 determines that the preset time is infinite according to all the comparison results, that is, the logic processing unit 213 does not cut off the driving voltage Vd; if the voltage value of the feedback voltage Vr is smaller than the voltage values of all the reference voltages Vref, and the driving voltage Vd is extremely small, the logic processing unit 213 determines that the preset time is short according to all the comparison results, so that UVP protection is triggered in a short time, and the driving voltage Vd is cut off, so that the time for triggering UVP protection can be adjusted according to the actual situation of the driving voltage Vd, and the driving IC is prevented from being damaged due to continuous operation under the condition of serious short circuit.
Specifically, the undervoltage protection unit 21 includes at least two independent comparators 212a, a first input terminal of each comparator 212a is connected to a reference voltage Vref, a second input terminal of each comparator 212a is connected to the feedback voltage Vr, an output terminal of each comparator 212a is connected to an input terminal of the logic processing unit 213, and an output terminal of the logic processing unit 213 is connected to an input terminal of the driving unit 30.
It should be noted that the reference voltages Vref connected to the first input terminals of all the comparators 212a are different, but the feedback voltages Vr connected to the second input terminals of all the comparators 212a are the same, so that the feedback voltage Vr can be independently compared with a plurality of different reference voltages Vref by using the comparing unit 212, so as to output different comparison results according to different situations.
It is understood that one of the first input terminal and the second input terminal of the comparator 212a is a non-inverting input terminal, and the other is an inverting input terminal; taking the first input terminal of the comparator 212a as the negative input terminal and the second input terminal of the comparator 212a as the positive input terminal as an example, when the feedback voltage Vr is greater than the reference voltage Vref, the output terminal of the comparator 212a outputs a high voltage, and when the feedback voltage Vr is less than the reference voltage Vref, the output terminal of the comparator 212a outputs a low voltage.
Specifically, the voltage dividing unit 211 includes a first resistor R1 and a second resistor R2 connected in series, a first end of the first resistor R1 is connected to the driving voltage Vd, and a second end of the first resistor R1, a first end of the second resistor R2, and a second input end of the comparator 212a are connected to a node, so as to output the feedback voltage Vr; the second end of the second resistor R2 is grounded.
In one embodiment, the voltage values of all the reference voltages Vref are in an arithmetic progression; if 8 different reference voltages Vref are set, 8 independent comparators 212a are required to access the 8 different reference voltages Vref, respectively, and taking the setting value of the driving voltage Vd as 10 as an example, the voltage values of the 8 reference voltages Vref may be 8, 7, 6, 5, 4, 3, 2, and 1, respectively.
It will be appreciated that other numbers of reference voltages Vref may be provided, and that the difference between the reference voltages Vref may be other values, such as 0.5, 1.5, or 2.
In one embodiment, the voltage value of the reference voltage Vref is 0.2 to 0.8 times the set value of the driving voltage Vd.
It should be noted that, of all the reference voltages Vref, the maximum voltage value may be the preset value, that is, the reference voltage Vref with the maximum voltage value is the standard voltage for determining whether the driving voltage Vd needs to trigger the UVP protection.
Further, the preset time is inversely related to the voltage value of the feedback voltage Vr.
It can be understood that the larger the voltage value of the feedback voltage Vr is, the smaller the reduction degree of the driving voltage Vd is, and the longer the preset time for triggering the UVP protection by the driving voltage Vd at this time is; and when the voltage value of the feedback voltage Vr is smaller, the larger the reduction degree of the driving voltage Vd is, the smaller the preset time for triggering the UVP protection by the driving voltage Vd is, so that the UVP protection can be triggered to cut off the driving voltage Vd in a very short time, and under the condition that the short circuit of the variable resistor Rv is more serious, the UVP protection can be triggered to cut off the driving voltage Vd as soon as possible, so that the components such as a driving IC (integrated circuit) and the like are prevented from being seriously damaged.
In one embodiment, when the voltage value of the reference voltage Vref connected to the comparator 212a is greater than the voltage value of the feedback voltage Vr, the comparator 212a outputs a first comparison result, and the preset time is inversely proportional to the number of comparators 212a outputting the first comparison result.
When the voltage value of the reference voltage Vref accessed by the comparator 212a is smaller than the voltage value of the feedback voltage Vr, the comparator 212a outputs a second comparison result.
It should be noted that, the larger the number of comparators 212a outputting the first comparison result, the smaller the voltage value indicating the feedback voltage Vr, and thus the shorter the time required to trigger the UVP protection to cut off the driving voltage Vd; taking 8 comparators 212a as an example, when the voltage values of all the reference voltages Vref are greater than the voltage value of the feedback voltage Vr, the 8 comparators 212a output the first comparison result, and the voltage value of the feedback voltage Vr is extremely small, so that the UVP protection needs to be triggered in an extremely short time to cut off the driving voltage Vd.
It can be understood that, the first comparison result and the second comparison result output by the output terminal of the comparator 212a are both binary signals 0 or 1, for example, the first input terminal of the comparator 212a is an inverting input terminal, the second input terminal of the comparator 212a is a non-inverting input terminal, and when the feedback voltage Vr is greater than the reference voltage Vref, the second comparison result output by the output terminal of the comparator 212a is binary signal 1; when the feedback voltage Vr is greater than the reference, the second comparison result output by the output terminal of the comparator 212a is a binary signal 0; when 8 comparators 212a are provided, all comparison results received by logic processing unit 213 form an 8-bit binary number, for example, when feedback voltage Vr is greater than all reference voltages Vref, all comparison results received by logic processing unit 213 form 8-bit binary number 11111111, logic processing unit 213 may drive the preset time according to the number of 1 in the binary number formed by the comparison results, and the smaller the number of 1 in the binary number formed by the comparison results, the more the driving voltage Vd is dropped, the shorter the preset time.
The beneficial effects of the invention are as follows: through comparing feedback voltage Vr with a plurality of different reference voltage Vref to confirm different preset time according to different comparison results, thereby reach that driving voltage Vd decline degree is more, trigger UVP protection with the time of cutting off driving voltage Vd the shorter, can be according to the actual conditions adjustment of driving voltage Vd and trigger the time of UVP protection, avoid drive IC to lead to drive IC to damage under the serious condition of short circuit.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The principle and the implementation of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (8)
1. A display panel, comprising:
the voltage input unit is used for providing a driving voltage;
the input end of the driving unit is connected with the driving voltage;
the undervoltage protection unit comprises a voltage division unit, a comparison unit and a logic processing unit;
the voltage division unit is used for accessing the driving voltage and outputting a feedback voltage, and the feedback voltage is smaller than the driving voltage; the comparison unit is used for comparing a feedback voltage with a plurality of reference voltages and outputting a comparison result; the logic processing unit is used for cutting off the driving voltage when the voltage value of the driving voltage is smaller than a preset value and lasts for preset time corresponding to the comparison result, and the voltage value of the reference voltage is smaller than or equal to the preset value;
the voltage input unit comprises a variable resistor, a first end of the variable resistor is connected with the input end of the voltage dividing unit, and a second end of the variable resistor is grounded; the voltage input unit further comprises a boosting inductance coil and a boosting diode, wherein the first end of the boosting inductance coil is connected with an input voltage, the second end of the boosting inductance coil is connected with the anode of the boosting diode, and the cathode of the boosting diode is connected with the first end of the variable resistor and the input end of the voltage dividing unit.
2. The display panel according to claim 1, wherein the under-voltage protection unit comprises at least two independent comparators, a first input terminal of each comparator is connected to a reference voltage, a second input terminal of each comparator is connected to the feedback voltage, an output terminal of each comparator is connected to the input terminal of the logic processing unit, and an output terminal of the logic processing unit is connected to the input terminal of the driving unit.
3. The display panel according to claim 2, wherein the voltage divider comprises a first resistor and a second resistor connected in series, a first end of the first resistor is connected to the driving voltage, a second end of the first resistor and a first end of the second resistor are connected to a node, and a second input terminal of the comparator is connected to a node for outputting the feedback voltage; and the second end of the second resistor is grounded.
4. The display panel according to claim 2, wherein the voltage values of all the reference voltages are in an arithmetic progression.
5. The display panel according to claim 4, wherein the reference voltage has a voltage value 0.2-0.8 times the set value of the driving voltage.
6. The display panel according to any one of claim 2, wherein the preset time is inversely related to a voltage value of the feedback voltage.
7. The display panel according to claim 6, wherein the comparator outputs a first comparison result when the voltage value of the reference voltage accessed by the comparator is greater than the voltage value of the feedback voltage, and the preset time is inversely proportional to the number of comparators outputting the first comparison result.
8. The display panel according to claim 1, wherein the voltage input unit further comprises a capacitor, a first terminal of the capacitor is connected to a cathode of the diode, and a second terminal of the capacitor is connected to a second terminal of the variable resistor.
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| WO2023154218A1 (en) * | 2022-02-14 | 2023-08-17 | Cirrus Logic International Semiconductor Ltd. | Power management system with distributed error feedback |
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| KR20130017892A (en) * | 2011-08-12 | 2013-02-20 | 엘지디스플레이 주식회사 | Liquid crystal display device and driving method thereof |
| CN103916011A (en) * | 2012-12-31 | 2014-07-09 | 乐金显示有限公司 | Power Supplying Apparatus And Display Apparatus Including The Same |
| CN105607719A (en) * | 2014-11-21 | 2016-05-25 | 鸿富锦精密工业(武汉)有限公司 | Time sequence control circuit |
| CN109067155A (en) * | 2018-07-10 | 2018-12-21 | 深圳市华星光电半导体显示技术有限公司 | Current foldback circuit, method and the display panel of DC-DC conversion circuit |
| CN110365196A (en) * | 2019-07-23 | 2019-10-22 | 中车青岛四方车辆研究所有限公司 | Three level integral type SiC-Mosfet drive systems and drive control method |
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