CN201041734Y - LCD power supply circuit and LCD - Google Patents
LCD power supply circuit and LCD Download PDFInfo
- Publication number
- CN201041734Y CN201041734Y CNU2006200160694U CN200620016069U CN201041734Y CN 201041734 Y CN201041734 Y CN 201041734Y CN U2006200160694 U CNU2006200160694 U CN U2006200160694U CN 200620016069 U CN200620016069 U CN 200620016069U CN 201041734 Y CN201041734 Y CN 201041734Y
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- liquid crystal
- circuit
- voltage
- crystal indicator
- direct current
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Abstract
The utility model relates to a power supply circuit of a liquid crystal display unit and the liquid crystal display unit. The liquid crystal display unit includes a liquid crystal faceplate for displaying the picture, a microcontroller unit, and a power supply circuit of the liquid crystal display unit. The power supply circuit of the liquid crystal display unit provides working voltage for all the circuit modules of the liquid crystal display unit, and includes a switch control circuit and a DC-DC converter. The DC-DC converter can regulate the DC voltage from exterior circuits, and outputs the working voltage. The working voltage supplies power to the liquid crystal faceplate through the switch control circuit, and the on-off state of the switch control circuit can be determined by a control signal from an exterior control circuit. The power consumptions of the power supply circuit of the liquid crystal display unit and the liquid crystal display unit are less in a standby mode.
Description
Technical field
The utility model relates to a kind of liquid crystal indicator feed circuit and the liquid crystal indicator that uses these liquid crystal indicator feed circuit.
Background technology
Along with the widespread use of liquid crystal indicator in the demonstration field, industry is more and more higher to the requirement of aspects such as its display quality, lightening, environmental protection situation, especially on power saving, requires its power consumption under standby mode to need less than 1 watt (W).
At present, in the liquid crystal indicator feed circuit, normal utilize low cheaply pressure reduction line pressure regulator (Low Drop-out Linear Regulator) as direct current to direct current transducer, its output voltage is exported the required operating voltage of each circuit module of this liquid crystal indicator after regulating via the back level direct current conversion module of these liquid crystal indicator feed circuit.
Seeing also Fig. 1, is the circuit structure diagram of a kind of direct current of prior art liquid crystal indicator feed circuit to direct current transducer.This direct current comprises a low pressure difference linearity pressure regulator 110, four filter capacitors 121,122,123,124 and a bleeder circuit 130 to direct current transducer 100.This low pressure difference linearity pressure regulator 110 will be from the external circuit one input voltage V of (figure does not show)
InAdjusting converts a fixing or adjustable output voltage V to
Out, and be sent to the back level direct current conversion module of this liquid crystal indicator.This bleeder circuit 130 is used for regulating and determining the output voltage V of this low pressure difference linearity pressure regulator 110
OutSize.This first filter capacitor 121 is connected to this input voltage V with this second filter capacitor 122
InAnd between the ground, so that to this input voltage V
InCarry out high pass and low-pass filtering; The 3rd filter capacitor 123 is connected to this output voltage V with the 4th filter capacitor 124
OutAnd between the ground, so that to this output voltage V
OutCarry out high pass and low-pass filtering.
This bleeder circuit 130 comprises one first resistance 131, one second resistance 132, a bypass electric capacity 134 and a dividing potential drop node 135.This first resistance 131 ground connection of connecting with this second resistance 132, thus constitute a series connection branch road.This dividing potential drop node 135 is between this first resistance 131 and this second resistance 132.This shunt capacitance 134 is connected between this dividing potential drop node 135 and the ground, and it can prevent the increase of these low pressure difference linearity pressure regulator 110 output voltage enlargement factors, strengthens the inhibition to output voltage ripple.
This low pressure difference linear voltage regulator 110 comprises a voltage input end 112, a voltage output end 113 and a voltage adjustment end 114.This input voltage V
InAfter this first filter capacitor 121 and these second filter capacitor, 122 filtering, be sent to this voltage input end 113.This voltage output end 113 is connected to series arm one end of this bleeder circuit 130, its output voltage V
OutAfter the 3rd filter capacitor 123 and 124 filtering of the 4th filter capacitor, be the back level direct current conversion module power supply of this liquid crystal indicator.This voltage adjustment end 114 is connected to this dividing potential drop node 135, thereby constitutes a backfeed loop with this bleeder circuit 130, and this backfeed loop provides a reference voltage V for this low pressure difference linearity pressure regulator 110
REF, and to the output voltage V of this voltage output end 113
OutRegulate.This reference voltage V
REFBe the voltage output end 113 of this low pressure difference linearity pressure regulator 110 and one 1.25 volts of voltage differences between the voltage adjustment end 114, this 1.25V voltage difference is set by these low pressure difference linearity pressure regulator 110 internal circuits.
This direct current to the principle of work of direct current transducer 100 is: the input voltage V of this voltage input end 112
InInternal circuit modulation conversion via this low pressure difference linearity pressure regulator 110 becomes required output voltage V
OutFrom these voltage output end 113 outputs, this output voltage V
OutRegulate via this voltage adjustment end 114 and the backfeed loop that this bleeder circuit 130 constitutes, its value is approximately V
Out=V
REF(1+R1/R2), wherein, R1 is the resistance of this first resistance 131, and R2 is the resistance of this second resistance 132.As seen, the resistance that only need adjust this second resistance 132 can realize regulating output voltage V
OutFunction.
Yet, when liquid crystal indicator is operated in standby mode, only closes the back light system of this liquid crystal indicator usually, and keep the output voltage V of this direct current all the time direct current transducer 110
OutTo the back level direct current conversion module power supply of these liquid crystal indicator feed circuit, thereby cause a large amount of electric energy losses, this direct current is used in order, and still power consumption is excessive under standby mode to the liquid crystal indicator feed circuit of direct current transducer 110.
The utility model content
In order to solve liquid crystal indicator feed circuit bigger problem of power consumption under standby mode in the prior art, be necessary to provide the less liquid crystal indicator feed circuit of electric energy loss under a kind of standby mode.
For solve liquid crystal indicator bigger problem of power consumption under standby mode in the prior art, also have provide a kind of under standby mode the less liquid crystal indicator of power consumption.
A kind of liquid crystal indicator feed circuit, it comprises that a direct current is to a direct current transducer and an ON-OFF control circuit.This direct current will be regulated from the DC voltage of external circuit direct current transducer, power to this liquid crystal panel via this ON-OFF control circuit thereby export an operating voltage, the conducting of this ON-OFF control circuit and off state are by the control signal decision from an external control circuit.
A kind of liquid crystal indicator, it comprises liquid crystal panel, a micro-control unit and liquid crystal indicator feed circuit that are used for display frame.These liquid crystal indicator feed circuit provide operating voltage for each circuit module of this liquid crystal indicator, and it comprises that an ON-OFF control circuit and a direct current are to direct current transducer.This direct current will be regulated from the DC voltage of external circuit direct current transducer, thereby export an operating voltage.To this liquid crystal panel power supply, the conducting of this ON-OFF control circuit and off state are by the control signal decision from an external control circuit via this ON-OFF control circuit for this operating voltage.
Compared with prior art, because whether the direct current of these liquid crystal indicator feed circuit controls its output services voltage to this liquid crystal panel power supply to direct current transducer by an ON-OFF control circuit, therefore, when this liquid crystal indicator is operated in standby mode, except that can making the back light shutoff, also can this direct current can't be powered to DC converting circuit by turn-offing this ON-OFF control circuit to this liquid crystal panel, thereby reduce the power consumption of these liquid crystal indicator feed circuit, it is less that also liquid crystal indicator power consumption under standby mode of these liquid crystal indicator feed circuit is used in order.
Description of drawings
Fig. 1 is the circuit structure diagram of a kind of direct current of prior art liquid crystal indicator feed circuit to direct current transducer.
Fig. 2 is the circuit structure block diagram of the utility model liquid crystal indicator one better embodiment.
Fig. 3 is the circuit diagram that direct current shown in Figure 2 is electrically connected with ON-OFF control circuit direct current transducer.
Embodiment
Seeing also Fig. 2, is the circuit structure block diagram of the utility model liquid crystal indicator one better embodiment.This liquid crystal indicator 2 comprises a liquid crystal panel 20, a data drive circuit 21, scan driving circuit 22, a video processing unit 23, time schedule controller 24, a micro-control unit 25 and liquid crystal indicator feed circuit 26.This scan drive circuit 22 is used for driving this liquid crystal panel 20 with this data drive circuit 21.These liquid crystal indicator feed circuit 26 provide operating voltage to each circuit module of this liquid crystal indicator 2.This micro-control unit 25 sends and controls signal to this video processing unit 23 according to the steering order of a Man Machine Interface (figure does not show) input.This video processing unit 23 will carry out respective handling from the vision signal and the synchronizing signal of external circuit (figure does not show), thereby output meets the image data signal of steering order requirement to this time schedule controller 24, this video processing unit 24 also sends feedback signal to this micro-control unit 25 simultaneously, informs that it has finished corresponding actions.This time schedule controller 24 is set according to sequential this image data signal is transferred to this data drive circuit 21, sends scan control signal simultaneously to this scan drive circuit 22.
These liquid crystal indicator feed circuit 26 comprise that a direct current is to direct current transducer 27, an ON-OFF control circuit 28 and a back grade direct current conversion module 29.This direct current is to the input voltage V of direct current transducer 27 from external circuit
InRegulate, thereby provide an operating voltage V to this micro-control unit 25
Dd, simultaneously will be through regulating the output voltage V that obtains
OutProvide to this back level direct current conversion module 29 via this ON-OFF control circuit 28.This back level direct current conversion module 29 will be via the output voltage V of this ON-OFF control circuit 28
OutConvert the required operating voltage V of the required main operating voltage AVDD of this scan drive circuit 22 required grid operating voltage VGH, VGL, this sequential control circuit 24 and this video processing unit 23 to
CcThis ON-OFF control circuit 28 receives the control signal that this micro-control unit 25 sends, and the level of this control signal just determines the conducting and the off state of this ON-OFF control circuit 28.
Seeing also Fig. 3, is the circuit structure diagram that this direct current is electrically connected with ON-OFF control circuit 28 direct current transducer 27.This direct current comprises a low pressure difference linearity pressure regulator 271, four filter capacitors 272,273,274,275 and a bleeder circuit 276 to direct current transducer 27.The direct current input voltage V that this low pressure difference linearity pressure regulator 271 receives from external circuit
In, and with this input voltage V
InConvert fixing or adjustable output voltage V to
OutThis bleeder circuit 276 is used for regulating and determining the output voltage V of this low pressure difference linearity pressure regulator 271
OutSize.This first filter capacitor 272 is connected to this input voltage V with this second filter capacitor 273
InAnd between the ground, so that to this input voltage V
InCarry out high pass and low-pass filtering; The 3rd filter capacitor 274 is connected to this output voltage V with the 4th filter capacitor 275
OutAnd between the ground, so that to this output voltage V
OutCarry out high pass and low-pass filtering.
This bleeder circuit 276 comprises one first resistance 2761, one second resistance 2762, a bypass electric capacity 2763 and a dividing potential drop node 2764.This first resistance 2761 ground connection of connecting with this second resistance 2762, thus constitute a series connection branch road.This dividing potential drop node 2764 is between this first resistance 2761 and this second resistance 2762.This shunt capacitance 2763 is connected between this dividing potential drop node 2764 and the ground, and it can prevent this low pressure difference linearity pressure regulator 271 output voltage V
OutThe increase of enlargement factor strengthens output voltage V
OutRipple suppress.
This low pressure difference linear voltage regulator 271 comprises a voltage input end 2711, a voltage output end 2712 and a voltage adjustment end 2713.This input voltage V
InAfter this first filter capacitor 272 and these second filter capacitor, 273 filtering, be sent to this voltage input end 2711.This voltage output end 2712 is connected to an end of these bleeder circuit 276 series arms, its output voltage V
OutAfter carrying out filtering via the 3rd filter capacitor 274 and the 4th filter capacitor 275, a part provides operating voltage V to the micro-control unit 25 of this liquid crystal indicator 2
Dd, another part is powered to this back level direct current conversion module 29 via this ON-OFF control circuit 28.This voltage adjustment end 2713 is connected to this dividing potential drop node 2764, thereby constitutes a backfeed loop with this bleeder circuit 276, and this backfeed loop provides a reference voltage V for this low pressure difference linearity pressure regulator 271
REF, and to the output voltage V of this voltage output end 2712
OutRegulate.This reference voltage V
REFBe the voltage output end 2712 of this low pressure difference linearity pressure regulator 271 and one 1.25 volts of voltage differences between the voltage adjustment end 2713, this 1.25V voltage difference is to be set by these low pressure difference linearity pressure regulator 271 internal circuits.
This ON-OFF control circuit 28 comprises a triode 281, a field effect transistor 282, three biasing resistors 283,284,285 and the slow electric capacity 286 that starts.This triode 281 is a NPN type triode, and it comprises a base stage 2811, a collector 2812 and an emitter 2813.This field effect transistor 282 is a P-channel enhancement type MOSFET (Metallic Oxide Semiconductor Field Effect Transistor, mos field effect transistor), it comprises a grid 2821, one source pole 2822 and a drain electrode 2823.The base stage 2811 of this triode 281 is received from the control signal of these micro-control unit 25 outputs via this first biasing resistor 283, its emitter 2813 ground connection, collector 2812 are connected to the grid 2821 of this field effect transistor 282 via this second biasing resistor 284.The source electrode 2822 of this field effect transistor 282 is connected to this voltage output end 2712, and its 2823 output voltages that drain are to this back level direct current conversion module 29.The 3rd biasing resistor 285 is connected between this collector 2812 and this voltage output end 2712, and this slow electric capacity 286 that starts is connected between this grid 2821 and this voltage output end 2712.
This input voltage V
InInternal circuit modulation conversion via this low pressure difference linearity pressure regulator 271 becomes required output voltage V
OutAnd via these voltage output end 2712 outputs, this output voltage V
OutRegulate via the backfeed loop that this voltage adjustment end 2713 and this bleeder circuit 276 constitute, its value is approximately V
Out=V
REF(1+R1/R2), wherein, R1 is the resistance of this first resistance 2761, and R2 is the resistance of this second resistance 2762.Output voltage V after regulating
OutA part provide operating voltage to this micro-control unit 25 because the required load current less (usually less than 50 milliamperes) of this micro-control unit 25, so it does not belong to main load, to output voltage V
OutPower consumption less; Another part is via level direct current conversion module 29 power supplies backward of this ON-OFF control circuit 28.When these liquid crystal indicator 2 operate as normal, this micro-control unit 25 sends the base stage 2811 of a high-level control signal to this triode 281, make this triode 281 conductings, then its collector 2812 electromotive forces are approximately zero potential, it is a low level that thereby grid 2821 electromotive forces that make this field effect transistor 282 drag down, these field effect transistor 282 conductings, thereby from its drain electrode 2823 these output voltage V of output
OutTo this back level direct current conversion module 29.Otherwise, when the user imports standby command to micro-control unit 25 by this Man Machine Interface, this micro-control unit 25 sends the base stage 2811 that a low level controls signal to this triode 281, make this triode 281 by turn-offing, then grid 2821 electromotive forces of this field effect transistor 282 are approximately equal to this output voltage V
Out, this field effect transistor 282 is by turn-offing this output voltage V
OutOnly provide operating voltage V to this micro-control unit 25
Dd
Since this direct current to direct current transducer 27 by an ON-OFF control circuit 28 control output voltage V
OutWhether export back level direct current conversion module 29 to, then when this liquid crystal indicator 2 was operated in standby mode, this direct current stopped only providing operating voltage V to this micro-control unit 25 to these back level direct current conversion module 29 power supplies to direct current transducer 27
Dd, then this liquid crystal display is adorned 2 energy consumption and only is the power consumption of micro-control unit 25 work, and establishing its load current is I, and power consumption is P, then P=(V
Out-V
In) I, I is very little because of load current, so the power consumption of these liquid crystal indicator feed circuit 26 is less, it is less that also liquid crystal indicator 2 power consumption under standby mode of these liquid crystal indicator feed circuit 26 is used in order.Show that through emulation experiment under standby mode, the output power loss of prior art liquid crystal indicator is approximately 1.08 watts, and uses the output power loss of the liquid crystal indicator 2 of these liquid crystal indicator feed circuit 26 only to be 0.24 watt.
Claims (10)
1. liquid crystal indicator feed circuit, it comprises that a direct current is to direct current transducer, this direct current will be regulated from the DC voltage of external circuit direct current transducer, and then export an operating voltage, it is characterized in that: these liquid crystal indicator feed circuit further comprise an ON-OFF control circuit, this direct current is powered to this liquid crystal panel via this ON-OFF control circuit to the operating voltage of direct current transducer output, and the conducting of this ON-OFF control circuit and off state are by the control signal decision from an external control circuit.
2. liquid crystal indicator feed circuit as claimed in claim 1, it is characterized in that: these liquid crystal indicator feed circuit further comprise a back grade direct current conversion module, this is grade operating voltage that direct current modulus of conversion group of received is exported via this ON-OFF control circuit afterwards, and converts this operating voltage to each required operating voltage of this liquid crystal panel demonstration.
3. liquid crystal indicator feed circuit as claimed in claim 2, it is characterized in that: this direct current comprises a low pressure difference linearity pressure regulator and a bleeder circuit to direct current transducer, this low pressure difference linearity pressure regulator is regulated the DC voltage from external circuit, thereby export the required operating voltage of this back level direct current conversion module, this bleeder circuit is connected between this low pressure difference linearity pressure regulator and the ON-OFF control circuit, and it is used for regulating and determining the output voltage size of this low pressure difference linearity pressure regulator.
4. liquid crystal indicator feed circuit as claimed in claim 3 is characterized in that: this bleeder circuit is a series connection resistor voltage divider circuit, and tool one dividing potential drop node between two adjacent resistance.
5. liquid crystal indicator feed circuit as claimed in claim 4, it is characterized in that: this low pressure difference linearity pressure regulator comprises a voltage input end, a voltage output end and a voltage adjustment end, this voltage input end receives the DC voltage from external circuit, this voltage output end is connected with this bleeder circuit, and output services voltage is to this ON-OFF control circuit, this voltage adjustment end links to each other with this dividing potential drop node, thereby makes this low pressure difference linearity pressure regulator and this bleeder circuit constitute a feedback circuit.
6. liquid crystal indicator feed circuit as claimed in claim 3 is characterized in that: this ON-OFF control circuit comprises a triode and a field effect transistor, and this triode is used for controlling the conducting and the off state of this field effect transistor.
7. liquid crystal indicator feed circuit as claimed in claim 6, it is characterized in that: this triode comprises a base stage, an emitter and a collector, this field effect transistor comprises a grid, one source pole and a drain electrode, this base stage receives the control signal from external control circuit, this collector is connected to this grid, this grounded emitter, this source electrode are connected to the output terminal of this direct current to direct current transducer, this drain electrode output services voltage.
8. liquid crystal indicator feed circuit as claimed in claim 6 is characterized in that: this triode is a NPN type triode, and this field effect transistor is a P-channel enhancement type mos field effect transistor.
9. liquid crystal indicator feed circuit as claimed in claim 1 is characterized in that: this external control circuit is a micro-control unit.
10. liquid crystal indicator, it comprises a liquid crystal panel, a micro-control unit and liquid crystal indicator feed circuit, these liquid crystal indicator feed circuit is characterized in that for each circuit module of this liquid crystal indicator provides operating voltage: these liquid crystal indicator feed circuit are any described liquid crystal indicator feed circuit in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200160694U CN201041734Y (en) | 2006-11-29 | 2006-11-29 | LCD power supply circuit and LCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200160694U CN201041734Y (en) | 2006-11-29 | 2006-11-29 | LCD power supply circuit and LCD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201041734Y true CN201041734Y (en) | 2008-03-26 |
Family
ID=39253448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200160694U Expired - Lifetime CN201041734Y (en) | 2006-11-29 | 2006-11-29 | LCD power supply circuit and LCD |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201041734Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577097A (en) * | 2008-05-08 | 2009-11-11 | 奇美电子股份有限公司 | Liquid crystal display device module and voltage generating circuit thereof |
| CN102314830A (en) * | 2010-06-30 | 2012-01-11 | 三星移动显示器株式会社 | Organic light-emitting display device and driving method thereof |
| CN102759978A (en) * | 2011-04-27 | 2012-10-31 | 意法半导体有限公司 | Circuit for display equipment and power supply method |
| CN103869201A (en) * | 2012-12-11 | 2014-06-18 | 上海天马微电子有限公司 | Interface connection deviation detection and protection circuit |
| CN105304110A (en) * | 2015-11-26 | 2016-02-03 | 上海兆芯集成电路有限公司 | Control method for data receiving chip |
| CN109935190A (en) * | 2019-03-28 | 2019-06-25 | 京东方科技集团股份有限公司 | Electrifying timing sequence control unit, power-on time sequence control method and display module |
| CN110728961A (en) * | 2019-10-22 | 2020-01-24 | 南京熊猫电子制造有限公司 | Delay control circuit and control method on liquid crystal display |
| CN112017608A (en) * | 2020-09-01 | 2020-12-01 | Tcl华星光电技术有限公司 | Liquid crystal display and voltage regulating method thereof |
| CN114120926A (en) * | 2020-09-01 | 2022-03-01 | 元太科技工业股份有限公司 | Voltage regulating circuit, voltage regulating method and display device |
| US11495185B2 (en) | 2020-09-01 | 2022-11-08 | E Ink Holdings Inc. | Voltage regulating circuit, voltage regulating method and display device |
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2006
- 2006-11-29 CN CNU2006200160694U patent/CN201041734Y/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577097A (en) * | 2008-05-08 | 2009-11-11 | 奇美电子股份有限公司 | Liquid crystal display device module and voltage generating circuit thereof |
| CN102314830A (en) * | 2010-06-30 | 2012-01-11 | 三星移动显示器株式会社 | Organic light-emitting display device and driving method thereof |
| CN102759978A (en) * | 2011-04-27 | 2012-10-31 | 意法半导体有限公司 | Circuit for display equipment and power supply method |
| US10719114B2 (en) | 2011-04-27 | 2020-07-21 | Stmicroelectronics (Shenzhen) R&D Co. Ltd. | Data source and display having power circuits providing different output voltages based on duty cycle |
| CN102759978B (en) * | 2011-04-27 | 2016-04-13 | 意法半导体有限公司 | For circuit and the method for supplying power to of display device |
| US9958919B2 (en) | 2011-04-27 | 2018-05-01 | STMicroelectronics (Shenzhen) R&D Co., Ltd. | Data source and display having power circuits providing different output voltages based on duty cycle |
| CN103869201A (en) * | 2012-12-11 | 2014-06-18 | 上海天马微电子有限公司 | Interface connection deviation detection and protection circuit |
| CN103869201B (en) * | 2012-12-11 | 2016-08-03 | 上海天马微电子有限公司 | A kind of interface connects off normal detecting and protection circuit |
| CN105304110B (en) * | 2015-11-26 | 2019-02-12 | 上海兆芯集成电路有限公司 | The control method of data receiver chip |
| CN105304110A (en) * | 2015-11-26 | 2016-02-03 | 上海兆芯集成电路有限公司 | Control method for data receiving chip |
| CN109935190A (en) * | 2019-03-28 | 2019-06-25 | 京东方科技集团股份有限公司 | Electrifying timing sequence control unit, power-on time sequence control method and display module |
| CN110728961A (en) * | 2019-10-22 | 2020-01-24 | 南京熊猫电子制造有限公司 | Delay control circuit and control method on liquid crystal display |
| CN112017608A (en) * | 2020-09-01 | 2020-12-01 | Tcl华星光电技术有限公司 | Liquid crystal display and voltage regulating method thereof |
| CN114120926A (en) * | 2020-09-01 | 2022-03-01 | 元太科技工业股份有限公司 | Voltage regulating circuit, voltage regulating method and display device |
| US11495185B2 (en) | 2020-09-01 | 2022-11-08 | E Ink Holdings Inc. | Voltage regulating circuit, voltage regulating method and display device |
| CN114120926B (en) * | 2020-09-01 | 2023-03-10 | 元太科技工业股份有限公司 | Voltage regulating circuit, voltage regulating method and display device |
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