CN104778933B - power management circuit - Google Patents
power management circuit Download PDFInfo
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- CN104778933B CN104778933B CN201510176780.XA CN201510176780A CN104778933B CN 104778933 B CN104778933 B CN 104778933B CN 201510176780 A CN201510176780 A CN 201510176780A CN 104778933 B CN104778933 B CN 104778933B
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- outfan
- management circuit
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- 230000005611 electricity Effects 0.000 claims description 6
- 230000005669 field effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a power management circuit. The power management circuit comprises a power end, a low level output circuit, a feedback circuit, a power circuit and an output end, wherein the low level output circuit is connected to the feedback circuit through the output end; the power circuit is connected with the power end and the feedback circuit; the feedback circuit comprises a Schmidt trigger, an inverter and a first transistor; the input end of the Schmidt trigger is connected to the output end of the power management circuit; the output end of the Schmidt trigger is connected with the control end of the first transistor through the inverter; one path end of the first transistor is grounded; the other path end of the first transistor is connected to the output end of the power management circuit. The power management circuit provided by the invention can solve the problem that after shutdown, a ghosting effect of a display panel cannot be completely eliminated.
Description
Technical field
The present invention relates to a kind of electric power management circuit, more particularly to a kind of electric power management circuit of display floater.
Background technology
Liquid crystal display mainly includes display floater and the printed circuit board (PCB) for providing various working signals for display floater
(Printed Circuit Board Assembly, PCBA), display floater include gate driver circuit, source electrode drive circuit with
And pel array.Pel array is intersected the multiple pixel cells arrangement for limiting by multi-strip scanning line and a plurality of data lines and is formed, and one
As for, pixel cell mainly include thin film transistor (TFT), storage capacitors and liquid crystal capacitance.The outfan coupling of gate driver circuit
Multi-strip scanning line is connected to, to be turned on and off the multiple thin film transistor (TFT)s with the connection of corresponding scan line.Source electrode drive circuit with
A plurality of data lines is connected, and when multiple thin film transistor (TFT)s are opened, provides GTG for corresponding pixel cell and shows voltage, so that
Signal of video signal is stored with each pixel cell with display image.Because liquid crystal display is in display image, can be in storage
Stored charge in electric capacity, when the display floater power cutoff of liquid crystal display, these stored charges will make corresponding pixel
Unit is in different GTGs, so as to remain some images on a display screen.
In order to solve the problems, such as the power-off ghost shadow of display floater, gate driver circuit of the prior art be typically provided with for
The XON pins of power-off ghost shadow are removed, when display panel voltage source is closed, the electric power management circuit on printed circuit board (PCB) draws to XON
Foot provides a low level signal, so that gate driver circuit is all to open to all scan lines offer grid level high voltage signal
The thin film transistor (TFT) of pixel cell, so that pixel cell carries out repid discharge to reach the purpose for eliminating ghost.
Fig. 1 is refer to, Fig. 1 is a kind of structural representation of electric power management circuit.The electric power management circuit 10 includes comparing
Device 100, transistor 102, bleeder circuit 103 and pull-up resistor 104.The comparator 100 includes in-phase end (sign), anti-phase
End (sign) and an outfan (sign), the end of oppisite phase connects the bleeder circuit 103, and positive terminal is used to receive a reference
Voltage REF, the outfan connects the control end (sign) of the transistor 102, a path terminal (sign) of the transistor 102
Ground connection, another path terminal (sign) of the transistor 102 connects a power end VDD by pull-up resistor 104, and it is aobvious to connect one
Show the XON pins of the gate driver circuit on panel.The bleeder circuit 103 include resistance R1 and resistance R2, the one of resistance R1
End connection power end VDD, the other end connects the end of oppisite phase of the comparator 100, and Jing resistance R2 is grounded.The pull-up resistor 104
One end connect power end VDD, the other end connects the XON pins.
When display floater shuts down, the voltage continuous decrease on power end VDD, when reference voltage REF is decreased to less than, than
Transistor 102 is turned on compared with the output high level of device 100, so as to the current potential of XON pins be dragged down, now gate driver circuit detection
It is low level to XON pins, provides grid level high voltage signal to open all pixels unit to all scan lines of display floater
Thin film transistor (TFT) so that pixel cell carries out repid discharge to eliminate ghost.
However, ghost can not be completely eliminated using aforesaid way, Fig. 2 is refer to, Fig. 2 is mistake of the display floater in shutdown
The oscillogram of the change in voltage in journey on power end vdd voltage and XON pins.As shown in Fig. 2 at the t1 moment, display floater is closed
Close, power end vdd voltage (being represented with VDD in Fig. 2) declines, the voltage (being represented with XON in Fig. 2) on XON pins is pulled low to
Low level.Jing after for a period of time to the t2 moment, electric power management circuit 10 is caused to stop because power end vdd voltage continues decline
Work, transistor 102 stop conducting, now, because power end VDD is connected with pull-up resistor 104, the pull-up resistor 104 but with
XON pins are connected, and the power end VDD that the XON pins current potential can declined by current potential draws high, so as to cause ghost to eliminate work(
Can close.Therefore, because the time that ghost eliminates function unlatching after display floater shutdown is too short, it is impossible to which residual charge is complete
Release, so as to cannot thoroughly eliminate power-off ghost shadow.
The content of the invention
The purpose of the present invention includes providing a kind of electric power management circuit, to solve prior art in display floater in shutdown
When, the residual charge in display floater cannot discharge completely, so as to cannot thoroughly eliminate the problem of power-off ghost shadow.
Specifically, embodiments of the invention provide a kind of electric power management circuit, and the electric power management circuit includes power end, low
Electrical level output circuit, feedback circuit, power circuit and outfan, the low level output circuit being somebody's turn to do by the electric power management circuit
Outfan is connected to the feedback circuit, and the power circuit connects the power end and the feedback circuit, and the feedback circuit includes applying close
Special trigger, phase inverter and the first transistor, the input of the Schmidt trigger is connected to the outfan, the schmidt trigger
The outfan of device is connected by the phase inverter with the control end of the first transistor, the path termination of the first transistor
Ground, another path terminal of the first transistor is connected to the outfan of the electric power management circuit.
Preferably, the low level output circuit includes comparator, transistor seconds and bleeder circuit, and the comparator includes
Positive terminal, end of oppisite phase and outfan, the end of oppisite phase connects the bleeder circuit, and the positive terminal is used to receive a reference voltage, the ratio
Compared with the control end that the outfan of device connects the transistor seconds, a path terminal of the transistor seconds is grounded, the transistor seconds
Another path terminal connect the outfan of the electric power management circuit.
Preferably, the bleeder circuit includes first resistor and second resistance, and one end of the first resistor connects the power end,
The other end connects the end of oppisite phase of the comparator, and Jing second resistance ground connection.
Preferably, the power circuit includes diode and electric capacity, and the positive pole of the diode connects the power end, the diode
Negative pole connect the feedback circuit, and the Jing capacity earths.
Preferably, the electric power management circuit also includes pull-up resistor, and one end of the pull-up resistor connects the power end, another
End connects the outfan of the electric power management circuit.
Preferably, the outfan of the electric power management circuit connects the XON pins of the gate driver circuit on a display floater.
Preferably, the first transistor and the transistor seconds are N-channel type field effect transistor.
Because electric power management circuit provided by the present invention is after display floater is closed and eliminates function stop to ghost, can
The current potential of outfan is set to maintain the low level of a period of time via feedback circuit, so that power-off ghost shadow eliminates function and continues to play
Effect, further discharges residual charge, extends power-off ghost shadow and eliminates the time, solves the shutdown of display floater in prior art
Ghost eliminates halfway problem.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of description, and in order to allow the present invention above and other objects, features and advantages can
Become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, describe in detail as follows.
Description of the drawings
Fig. 1 is a kind of structural representation of electric power management circuit.
Fig. 2 is the oscillogram of change in voltage of the display floater during shutdown in power supply terminal voltage and XON pins.
The structural representation of the electric power management circuit that Fig. 3 this real inventive embodiment is provided.
The display floater that Fig. 4 is provided by embodiments of the invention power supply terminal voltage and XON pins during shutdown
On change in voltage oscillogram.
Specific embodiment
Further to illustrate the present invention to reach technological means and effect that predetermined purpose is taken, below in conjunction with accompanying drawing
And preferred embodiment, to the specific embodiment according to electric power management circuit proposed by the present invention, method, step, structure, feature
And effect, describe in detail as after.
For the present invention aforementioned and other technology contents, feature and effect, in the following preferable reality coordinated with reference to schema
Applying during example is described in detail to be clearly presented.By the explanation of specific embodiment, when can be to the present invention to reach predetermined mesh
The technological means taken and effect be able to more deeply and it is specific understand, but institute's accompanying drawings are only to provide with reference to and say
It is bright to be used, not for being any limitation as to the present invention.
Refer to Fig. 3, the structural representation of the electric power management circuit that Fig. 3 embodiments of the invention are provided.Such as Fig. 3 institutes
Show, in the present embodiment, electric power management circuit includes power end VDD, low level output circuit 20, feedback circuit 30, power supply electricity
Road 300 and outfan Out.Low level output circuit 20 is used to detect when power end VDD stops power supply by outfan Out
XON pin of one low level signal to the gate driver circuit on a display floater, the connection power end of power circuit 300 are provided
VDD and feedback circuit 30, for powering for feedback circuit 30 after power end VDD stops power supply, feedback circuit 30 is connected to defeated
Go out to hold Out, for making outfan Out keep low level after power end VDD stops power supply.
Low level output circuit 20 includes comparator 200, transistor seconds 202 and bleeder circuit 203, comparator 200
Including positive terminal (sign), end of oppisite phase (sign) and outfan (sign), end of oppisite phase connection bleeder circuit 203, positive
Hold for receiving a reference voltage REF, the outfan of comparator 200 connects the control end (sign) of transistor seconds 202, the
One path terminal (sign) ground connection of two-transistor 202, another path terminal (sign) connection outfan of transistor seconds 202
Out。
Bleeder circuit 203 includes first resistor 2030 and second resistance 2031, one end connection power supply of first resistor 2030
End VDD, the other end connects the end of oppisite phase of comparator 200, and Jing second resistances 2031 are grounded.
Power circuit 300 includes diode 3000 and electric capacity 3001, and the positive pole connection power end VDD of diode 3000 bears
Pole connects feedback circuit 30, and Jing electric capacity 3001 is grounded, and power circuit 300 is that Schmidt trigger 301 and phase inverter 302 are supplied
Electricity.
In power end VDD normal power supplies, power end VDD charges via diode 3000 for electric capacity 3001；Work as power end
When VDD stops power supply, electric capacity 3001 can power for feedback circuit 30, under running voltage needed for so as to slow down feedback circuit 30
Reduction of speed degree, increases the working time of feedback circuit 30.
Feedback circuit 30 includes Schmidt trigger 301, phase inverter 302 and the first transistor 303.Schmidt trigger
301 input In is connected to outfan Out, and the outfan of Schmidt trigger 301 is by phase inverter 302 and the first transistor
303 control end (sign) is connected, a path terminal (sign) ground connection of the first transistor 303, the first transistor 303
Another path terminal (sign) is connected to outfan Out.
Additionally, electric power management circuit also includes pull-up resistor 204, one end of pull-up resistor 204 connects power end VDD, separately
One end connects outfan Out.
In the present embodiment, the first transistor 303 and transistor seconds 202 can be N-channel type field effect transistor.
When electric power management circuit 20 is used to be worked for a display floater, in display floater normal work, power end VDD
Normal power supply, the partial pressure that bleeder circuit 203 is provided is more than reference voltage REF, and the outfan of comparator 200 exports low level,
Transistor seconds 202 in low level output circuit 20 is closed, and the current potential of outfan Out is by power end VDD Jing
Pull-up resistor 204 is drawn high, that is to say, that the electricity on the XON pins of the gate driver circuit on the display floater of connection outfan Out
Position is driven high, gate driver circuit normal work.
When the power-off of display floater, when power end VDD stops power supply, the voltage on power end VDD is gradually reduced, when
When the partial pressure that bleeder circuit 203 is provided is less than reference voltage REF, the outfan output high level of comparator 200 makes second brilliant
Body pipe 202 is turned on, and the current potential of outfan Out is dragged down, there is provided low level signal gives XON pins, to open power-off ghost shadow elimination
Function.
When the voltage on power end VDD continues decline causes low level output circuit 20 not work, transistor seconds 202
Cut-off, and due to due to pull-up resistor 204, the current potential of outfan Out is pulled high to certain high level, makes on XON pins
Current potential be also driven high.Now, because power end VDD stops power supply, the electric capacity 3001 of power circuit 300 is supplied for feedback circuit 30
Electricity.When the current potential of outfan Out rises above the positive threshold voltage of Schmidt trigger 301, Schmidt trigger 301
Output low level, after inverted device 302 high level is become, and turns on the first transistor 303, again by the current potential of outfan Out
Drag down, there is provided low level signal gives XON pins, make power-off ghost shadow eliminate function and continue to play a role, remained with further release
Electric charge.And with the voltage continuous decrease on power end VDD, the current potential of outfan Out declines but is above Schmidt trigger
During 301 negative sense threshold voltage, the equally output low level of Schmidt trigger 301 becomes high level after inverted device, makes first
Transistor 303 continues to turn on and make the current potential of outfan Out still in low level state, therefore power-off ghost shadow eliminates function still
Continue.
Refer to Fig. 4, the display floater that Fig. 4 is provided by embodiments of the invention power supply terminal voltage during shutdown
With the oscillogram of the change in voltage on XON pins.As shown in figure 4, at the t1 moment, display floater is closed, power end vdd voltage
(being represented with VDD in Fig. 4) declines, and the voltage (being represented with XON in Fig. 4) on XON pins declines with power end vdd voltage.Work as electricity
Source vdd voltage continue decline Jing after for a period of time to the t2 moment when, the voltage on XON pins is pulled low to low level, open
Power-off ghost shadow eliminates function, and due to the presence of feedback circuit 30, after instant t 2, the voltage on XON pins is also always
Low level state is kept, is made power-off ghost shadow eliminate function and is still continued.
It can thus be seen that electric power management circuit 20 is stopped power supply to low level output circuit 20 in power end VDD stopping
After work, also via feedback circuit 30 current potential of outfan Out can be made to maintain the low level of a period of time, so that shutdown is residual
Shadow eliminates function to be continued to play a role, and further discharges residual charge, is extended power-off ghost shadow and is eliminated the time.
The above, is only presently preferred embodiments of the present invention, and any pro forma restriction is not made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, in the range of without departing from technical solution of the present invention, when making a little change or modification using the technology contents of the disclosure above
For the Equivalent embodiments of equivalent variations, as long as being without departing from technical solution of the present invention content, according to the technical spirit pair of the present invention
Any simple modification, equivalent variations and modification that above example is made, still fall within the range of technical solution of the present invention.
Claims (6)
1. a kind of electric power management circuit, it is characterised in that the electric power management circuit includes power end, low level output circuit, anti-
Road, power circuit output end, pull-up resistor are fed back to, one end of the pull-up resistor connects the power end, and the other end connects the power supply
The outfan of management circuit, the low level output circuit is connected to the feedback circuit by the outfan, the power circuit connection
The power end and the feedback circuit, the feedback circuit includes Schmidt trigger, phase inverter and the first transistor, and the Schmidt touches
The input for sending out device is connected to the outfan of the electric power management circuit, and the outfan of the Schmidt trigger passes through the phase inverter
It is connected with the control end of the first transistor, the path terminal ground connection of the first transistor, the another of the first transistor is led to
Terminal is connected to the outfan of the electric power management circuit.
2. electric power management circuit according to claim 1, it is characterised in that the low level output circuit include comparator,
Transistor seconds and bleeder circuit, the comparator includes positive terminal, end of oppisite phase and outfan, and the end of oppisite phase connects the partial pressure electricity
Road, the positive terminal is used to receive a reference voltage, and the outfan of the comparator connects the control end of the transistor seconds, and this second
The one path terminal ground connection of transistor, another path terminal of the transistor seconds connects the outfan of the electric power management circuit.
3. electric power management circuit according to claim 2, it is characterised in that the bleeder circuit includes first resistor and second
Resistance, one end of the first resistor connects the power end, and the other end connects the end of oppisite phase of the comparator, and the Jing second resistances
Ground connection.
4. electric power management circuit according to claim 1, it is characterised in that the power circuit includes diode and electric capacity,
The positive pole of the diode connects the power end, and the negative pole of the diode connects the feedback circuit, and the Jing capacity earths.
5. electric power management circuit according to claim 1, it is characterised in that the outfan connection one of the electric power management circuit
The XON pins of the gate driver circuit on display floater.
6. electric power management circuit according to claim 2, it is characterised in that the first transistor and the transistor seconds are
N-channel type field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510176780.XA CN104778933B (en) | 2015-04-15 | 2015-04-15 | power management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510176780.XA CN104778933B (en) | 2015-04-15 | 2015-04-15 | power management circuit |
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| Publication Number | Publication Date |
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| CN104778933A CN104778933A (en) | 2015-07-15 |
| CN104778933B true CN104778933B (en) | 2017-04-19 |
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| CN201510176780.XA Active CN104778933B (en) | 2015-04-15 | 2015-04-15 | power management circuit |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105047152A (en) * | 2015-08-05 | 2015-11-11 | 昆山龙腾光电有限公司 | Display module |
| CN105845069B (en) * | 2016-06-17 | 2018-11-23 | 京东方科技集团股份有限公司 | A kind of power-off ghost shadow eliminates circuit and its driving method, display device |
| CN106847143B (en) * | 2017-03-03 | 2020-12-29 | 昆山龙腾光电股份有限公司 | Detection circuit and display device |
| CN107610632B (en) * | 2017-09-27 | 2022-11-04 | 京东方科技集团股份有限公司 | Display driving circuit, power management device, display apparatus and driving method thereof |
| CN110120201B (en) * | 2018-02-07 | 2020-07-21 | 京东方科技集团股份有限公司 | Circuit for eliminating shutdown ghost, control method thereof and liquid crystal display device |
| CN108766385A (en) * | 2018-08-29 | 2018-11-06 | 广东长虹电子有限公司 | A kind of shadow circuit that disappears of screen TCON plates |
| CN109377958B (en) * | 2018-12-04 | 2020-04-28 | 深圳市华星光电半导体显示技术有限公司 | Grid driving circuit based on temperature compensation and display |
| CN109509444B (en) * | 2018-12-19 | 2021-07-06 | 惠科股份有限公司 | Control circuit of display panel, display device and control method |
| CN109410880B (en) * | 2018-12-20 | 2020-09-08 | 深圳市华星光电半导体显示技术有限公司 | Display panel driving circuit |
| CN110097860B (en) * | 2019-04-17 | 2021-06-29 | 昆山龙腾光电股份有限公司 | Display module |
| CN110327736A (en) * | 2019-05-14 | 2019-10-15 | 北京戴纳实验科技有限公司 | A kind of laboratory exhaust gas composite absorption adsorptive purifier |
| CN110459184A (en) * | 2019-06-27 | 2019-11-15 | 惠科股份有限公司 | Driving circuit and driving method of display panel and display device |
| CN110930961B (en) * | 2019-12-17 | 2022-04-12 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit, control method thereof and liquid crystal display device |
| CN111698826B (en) * | 2019-12-30 | 2022-03-01 | 重庆芯讯通无线科技有限公司 | PDN circuit and Internet of things module |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001285046A (en) * | 2000-03-31 | 2001-10-12 | Hitachi Ltd | Reset signal generation circuit and semiconductor integrated circuit |
| CN201191817Y (en) * | 2008-04-24 | 2009-02-04 | 华中科技大学 | Schmitt trigger |
| JP5133804B2 (en) * | 2008-07-18 | 2013-01-30 | ルネサスエレクトロニクス株式会社 | Reset signal generation circuit |
| CN102005187B (en) * | 2009-09-03 | 2012-08-29 | 奇景光电股份有限公司 | Liquid crystal displayer and driving circuit thereof |
| CN104811171B (en) * | 2014-01-26 | 2018-01-09 | 京微雅格（北京）科技有限公司 | The electrification reset circuit of zero current |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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