CN101236316A - LCD device electric supply and discharging circuit - Google Patents
LCD device electric supply and discharging circuit Download PDFInfo
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- CN101236316A CN101236316A CNA2007100730767A CN200710073076A CN101236316A CN 101236316 A CN101236316 A CN 101236316A CN A2007100730767 A CNA2007100730767 A CN A2007100730767A CN 200710073076 A CN200710073076 A CN 200710073076A CN 101236316 A CN101236316 A CN 101236316A
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- 230000005669 field effect Effects 0.000 claims abstract description 73
- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 239000004973 liquid crystal related substance Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
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- 230000005855 radiation Effects 0.000 description 1
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Abstract
The invention discloses a power supply and discharge circuit of a liquid crystal display, which comprises a power supply, a control signal input terminal, a power supply and discharge terminal, a first biasing resistor, a second biasing resistor, a discharge resistor, a diode, a charging capacitor, an NPN bipolar transistor, a P channel enhancement mode MOS field effect transistor and an N channel enhancement mode MOS field effect transistor. A basal pole of the NPN bipolar transistor is connected to the control signal input terminal; an emitting electrode of the NPN bipolar transistor is grounded; a collecting electrode of the NPN bipolar transistor is connected to the power supply through the first biasing resistor. A grid electrode of the P channel enhancement mode MOS field effect transistor is connected to the collecting electrode of the NPN bipolar transistor through the discharge resistor and the diode respectively and connected to a source electrode of the P channel enhancement mode MOS field effect transistor through the charging capacitor; the source electrode is connected to the power supply; a drain electrode of the P channel enhancement mode MOS field effect transistor is connected to the power supply and discharge terminal. A grid electrode of the N channel enhancement mode MOS field effect transistor is connected to the collecting electrode of the NPN bipolar transistor; a source electrode of the N channel enhancement mode MOS field effect transistor is grounded; a drain electrode of the N channel enhancement mode MOS field effect transistor is connected to the power supply and discharge terminal through the second biasing resistor.
Description
Technical field
The present invention relates to a kind of LCD device electric supply and discharge circuit.
Background technology
Because it is frivolous that LCD has, power consumption is hanged down and characteristics such as radiation is few, therefore is widely used in fields such as portable DVD player, visual music player, mobile phone and notebook computer.Usually, comprise in the LCD that feed circuit power to it.In addition, because the LCD internal circuit is a capacitive load, make LCD after outage, a large amount of residual charges be arranged still, so LCD also need a discharge circuit to discharge described residual charge.
Seeing also Fig. 1, is the synoptic diagram of a kind of prior art LCD device electric supply and discharge circuit.This LCD device electric supply and discharge circuit 10 comprise a controlling signal input end 110, one for discharge end 120, one 12 volts of direct supply 130, one 5V direct supplys 140, one NPN bipolarity the first transistors 150, one NPN bipolarity transistor seconds 170, one N channel enhancement MOS field-effect transistor, 160, one first resistance, 155, one second resistance 156, one the 3rd resistance 165, one the 4th resistance 175 and one the 5th resistance 176.
The base stage b of this first transistor 150 is connected to this controlling signal input end 110 by this first resistance 155, emitter e is connected to this base stage b by this second resistance 156, and this emitter e ground connection, collector c is connected to this 12V direct supply 130 by the 3rd resistance 165.
The base stage b of this transistor seconds 170 is connected to this controlling signal input end 110 by the 4th resistance 175, emitter e ground connection, and collector c is connected to this confession discharge end 120 by the 5th resistance 176.
The grid G of this N channel enhancement MOS field-effect transistor 160 is connected to the collector c of this NPN type the first transistor 150, and source S is connected to this confession discharge end 120, and drain D is connected to this 5V direct supply 140.
The principle of work of this LCD device electric supply and discharge circuit 10 is as follows::
When this controlling signal input end 110 is a logic low potential, this the first transistor 150 and this transistor seconds 170 all end, this 12V direct supply 130 offers the grid G of this N channel enhancement MOS field-effect transistor 160 by the 3rd resistance 165, makes 160 conductings of this N channel enhancement MOS field-effect transistor.This 5V direct supply 140 offers this confession discharge end 120 by the N channel enhancement MOS field-effect transistor 160 that is in conducting state, to LCD device electric supply.
When this controlling signal input end 110 is a logic high potential, these first, second transistor 150,170 all conductings, the grid G of this N channel enhancement MOS field-effect transistor 160 is by being in these the first transistor 150 ground connection of conducting state, drop-down is electronegative potential, so this N channel enhancement MOS field-effect transistor 160 ends.This moment, this confession discharge end 120 discharged the residual charge of this LCD inside successively by the 5th resistance 176 and these transistor seconds 170 ground connection that are in conducting state.
During 10 work of this LCD device electric supply and discharge circuit to the voltage waveform of LCD device electric supply as shown in Figure 2.When control signal is that logic low potential is closed the first transistor 150, N channel enhancement MOS field-effect transistor 160 conductings immediately at this moment make 5V direct supply 140 to LCD device electric supply.As shown in Figure 2,160 conducting moments of N channel enhancement MOS field-effect transistor can produce bigger dash current, so will quicken the inner component aging of LCD for a long time, reduce LCD serviceable life.
Summary of the invention
In order to solve LCD device electric supply and the bigger shortcoming of discharge circuit dash current in the prior art, be necessary to provide less LCD device electric supply of a kind of dash current and discharge circuit.
A kind of LCD device electric supply and discharge circuit, it comprises a power supply, and one provides the controlling signal input end of controlling signal, and one is used to the discharge end that supplies of this LCD device electric supply and discharge, one first biasing resistor, one second biasing resistor, a discharge resistance, a diode, one charging capacitor, one npn bipolar transistor, a P-channel enhancement type MOS field-effect transistor and a N channel depletion type MOS field-effect transistor.The base stage of this npn bipolar transistor is connected to this controlling signal input end, grounded emitter, and collector is connected to this power supply by this first biasing resistor.The grid of this P-channel enhancement type MOS field-effect transistor is connected to the collector of this npn bipolar transistor respectively by this discharge resistance and this diode, and is connected to source electrode by this charging capacitor, and source electrode is connected to this power supply, and drain electrode is connected to this confession discharge end.The grid of this N channel depletion type MOS field-effect transistor is connected to the collector of this npn bipolar transistor, source ground, and drain electrode is connected to for discharge end by this second biasing resistor.
A kind of LCD device electric supply and discharge circuit, it comprises a power supply, and one provides the controlling signal input end of controlling signal, and one is used to the discharge end that supplies of this LCD device electric supply and discharge, one first biasing resistor, one second biasing resistor, a discharge resistance, a diode, one charging capacitor, one the one N channel depletion type MOS field-effect transistor, a P-channel enhancement type MOS field-effect transistor and one the 2nd N channel depletion type MOS field-effect transistor.The grid of this N channel depletion type MOS field-effect transistor is connected to this controlling signal input end, source ground, and drain electrode is connected to this power supply by this first biasing resistor.The grid of this P-channel enhancement type MOS field-effect transistor is connected to the drain electrode of a N channel depletion type MOS field-effect transistor respectively by this discharge resistance and this diode, and be connected to source electrode by this charging capacitor, source electrode is connected to this power supply, and drain electrode is connected to this confession discharge end.The grid of this N channel depletion type MOS field-effect transistor is connected to the drain electrode of a N channel depletion type MOS field-effect transistor, source ground, and drain electrode is connected to for discharge end by this second biasing resistor.
A kind of LCD device electric supply and discharge circuit, it comprises a power supply, and one provides the controlling signal input end of controlling signal, and one is used to the discharge end that supplies of this LCD device electric supply and discharge, one first biasing resistor, one second biasing resistor, a discharge resistance, a diode, one charging capacitor, one first npn bipolar transistor, a PNP bipolar transistor and one the 2nd N channel depletion type MOS field-effect transistor.The base stage of this npn bipolar transistor is connected to this controlling signal input end, grounded emitter, and collector is connected to this power supply by this biasing resistor.The base stage of this PNP bipolar transistor is connected to the collector of this npn bipolar transistor respectively by this discharge resistance and this diode, and be connected to emitter by this charging capacitor, the emitter of this PNP bipolar transistor is connected to this power supply, and the collector of this PNP bipolar transistor is connected to this confession discharge end.The grid of this N channel depletion type MOS field-effect transistor is connected to the collector of this npn bipolar transistor, source ground, and drain electrode is connected to for discharge end by this second biasing resistor.
A kind of LCD device electric supply and discharge circuit, it comprises a power supply, and one provides the controlling signal input end of controlling signal, and one is used to the discharge end that supplies of this LCD device electric supply and discharge, one first biasing resistor, one second biasing resistor, a discharge resistance, a diode, one charging capacitor, one first npn bipolar transistor, a P-channel enhancement type MOS field-effect transistor and one second npn bipolar transistor.The base stage of this first npn bipolar transistor is connected to this controlling signal input end, grounded emitter, and collector is connected to this power supply by this first biasing resistor.The grid of this P-channel enhancement type MOS field-effect transistor is connected to the collector of this first npn bipolar transistor respectively by this discharge resistance and this diode, and be connected to source electrode by this charging capacitor, source electrode is connected to this power supply, and drain electrode is connected to this confession discharge end.The base stage of this second npn bipolar transistor is connected to the collector of this first npn bipolar transistor, grounded emitter, and collector is connected to for discharge end by this second biasing resistor.
Compared to prior art, above-mentioned LCD device electric supply and discharge circuit comprise a charging capacitor, one first biasing resistor, and a diode and a discharge resistance make the slow conducting of transistor that is connected between this power supply and this confession discharge end also end rapidly.Therefore, the moment impact electric current of LCD generation is less.
Description of drawings
Fig. 1 is the circuit diagram of a kind of prior art LCD device electric supply and discharge circuit.
Fig. 2 is the waveform synoptic diagram of the dash current of Fig. 1 LCD device electric supply and discharge circuit generation.
Fig. 3 is the synoptic diagram of LCD device electric supply of the present invention and discharge circuit one better embodiment.
Fig. 4 is the waveform synoptic diagram of the dash current of Fig. 3 LCD device electric supply and discharge circuit generation.
Embodiment
Seeing also Fig. 3, is the synoptic diagram of LCD device electric supply of the present invention and discharge circuit one better embodiment.This LCD device electric supply and discharge circuit 20 comprise a controlling signal input end 210, one for discharge end 220,230, one 3.3 volts of direct supplys of one 5 volts of direct supplys, 240, one NPN bipolarity transistor npn npns 250, one P-channel enhancement type MOS field-effect transistor 260, one N channel depletion type MOS field-effect transistor, 270, one first current-limiting resistances, 251, one pull-up resistors 252, one first biasing resistor 263, one discharge resistance, 264, one charging capacitors, 265, one diodes 266, one second current-limiting resistance 276, one second biasing resistor, 275, one first filter capacitors, 221, one second filter capacitors 222, one the 3rd filter capacitor 231 and one the 4th filter capacitor 232.
This controlling signal input end 210 is connected to this 3.3 volts of direct supplys 240 by this pull-up resistor 252.
The base stage b of this npn bipolar transistor 250 is connected to this controlling signal input end 210 by this first current-limiting resistance 251, emitter e ground connection, collector c is connected to this 5V direct supply 230 by this first biasing resistor 263, and collector c also is connected to the grid G of this P-channel enhancement type MOS field-effect transistor 260 respectively by this diode 266 and this discharge resistance 264.The positive pole of this diode 266 is connected with the collector c of npn bipolar transistor 250.
The grid G of this P-channel enhancement type MOS field-effect transistor 260 is connected to source S by this charging capacitor 265, and drain D is connected to this confession discharge end 220, and source S is connected to this 5V direct supply 230.
The grid S of this N channel depletion type MOS field-effect transistor 270 is connected to the collector c of this npn bipolar transistor 250 by this second current-limiting resistance 276, source S ground connection, and drain D is connected to this confession discharge end 220 by this second biasing resistor 275.
This passes through this first filter capacitor 221 and second filter capacitor, 222 ground connection respectively for discharge end 220.
This 5V direct supply 230 is respectively by the 3rd filter capacitor 231 and the 4th filter capacitor 232 ground connection.
The principle of work of this LCD device electric supply and discharge circuit 20 is as follows::
When this controlling signal input end 210 is a logic high potential, these npn bipolar transistor 250 conductings, electric charge on this charging capacitor 265 slowly discharges by this discharge resistance 264 and these npn bipolar transistor 250 ground connection that are in conducting state, so the voltage of the grid G of this P-channel enhancement type MOS field-effect transistor 260 slowly drops to 0.And the voltage V between P-channel enhancement type MOS field-effect transistor 260 grid G and the source S
GSGradually become-5V by 0V, make the 260 slow conductings of this P-channel enhancement type MOS field-effect transistor, this 5V direct supply 230 offers this confession discharge end 220 by the P-channel enhancement type MOS field-effect transistor 260 that is in conducting state then, to LCD device electric supply.This moment, this N channel depletion type MOS field-effect transistor 270 grid G was by this second current-limiting resistance 276 be in these npn bipolar transistor 250 ground connection of conducting state, so this N channel depletion type MOS field-effect transistor 270 ends.The moment that this LCD device electric supply and discharge circuit 20 produce produces bigger dash current can be with reference to figure 4.
When this controlling signal input end 210 is a logic low potential, this NPN gated transistors 250 ends, this 5V direct supply 230 offers the grid G of this P-channel enhancement type MOS field-effect transistor 260 by this first biasing resistor 263 and this diode 266 and this charging capacitor 265 is charged rapidly, at this moment, the voltage V between this P-channel enhancement type MOS field-effect transistor 260 grid G and the source S
GS=0V makes this P-channel enhancement type MOS field-effect transistor 260 end.Therefore, this is for the output of discharge end 220 no-voltages.The grid G of this N channel depletion type MOS field-effect transistor 270 is connected to this 5V direct supply 230 by this second current-limiting resistance 276 and this first biasing resistor 263 at this moment.Therefore this N channel depletion type MOS field-effect transistor 270 conductings, and the electric charge of LCD inside discharges by this second biasing resistor 275 and this N channel depletion type MOS field-effect transistor 270 ground connection that are in conducting state.
Compared to prior art, this LCD device electric supply and discharge circuit 20 comprise charging capacitor 265, one first biasing resistors, 263, one diodes 266 and a discharge resistance 264, make the 260 slow conductings of this P-channel enhancement type MOS field-effect transistor also end rapidly.Therefore, the moment impact electric current of LCD generation is less.
LCD device electric supply of the present invention and discharge circuit 20 also can have other change design, as:
In this LCD device electric supply and the discharge circuit 20, this npn bipolar transistor 250 is replaceable to be a N channel depletion type MO S field-effect transistor, its grid G is connected to this controlling signal input end 210 by this first current-limiting resistance 251, source S ground connection, drain D is connected to this 5V direct supply 230 by this first biasing resistor 263.
In this LCD device electric supply and the discharge circuit 20, this P-channel enhancement type MOS field-effect transistor 260 is replaceable to be a bipolarity PNP bipolar transistor, its base stage b is connected to the collector c of this npn bipolar transistor 250 respectively by this discharge resistance 264 and diode 266, the emitter e of this PNP bipolar transistor is connected to this 5V direct supply 230, and the collector c of this PNP bipolar transistor is connected to this confession discharge end 220.
In this LCD device electric supply and the discharge circuit 20, this N channel depletion type MOS field-effect transistor 270 is replaceable to be a NPN bipolarity transistor npn npn, its base stage b is connected to the collector c of this npn bipolar transistor 250 by this second current-limiting resistance 276, emitter e ground connection, collector c is connected to this confession discharge end 220 by this second biasing resistor 275.
In this LCD device electric supply and the discharge circuit 20, this npn bipolar transistor 250, this also can replace with a N channel depletion type MOS field-effect transistor respectively this P-channel enhancement type MOS field-effect transistor 260 and N channel depletion type MOS field-effect transistor 270, it is with reference to aforementioned two kinds of change designs that one a bipolarity PNP bipolar transistor and a NPN bipolarity transistor npn npn, its circuit connect the pass.
Claims (10)
1. LCD device electric supply and discharge circuit comprise::
One power supply;
One controlling signal input end, it provides controlling signal;
One for discharge end, is used to LCD device electric supply and discharge;
One npn bipolar transistor, its base stage are connected to this controlling signal input end, grounded emitter, and collector is connected to this power supply by one first biasing resistor;
One P-channel enhancement type MOS field-effect transistor, its source electrode is connected to this power supply, and drain electrode is connected to this confession discharge end; With
One N channel depletion type MOS field-effect transistor, its grid is connected to the collector of this npn bipolar transistor, source ground, drain electrode is connected to for discharge end by one second biasing resistor;
It is characterized in that: the grid of this P-channel enhancement type MOS field-effect transistor is connected to the collector of this npn bipolar transistor respectively by a discharge resistance and a diode, and is connected to the source electrode of this P-channel enhancement type MOS field-effect transistor by a charging capacitor.
2. LCD device electric supply as claimed in claim 1 and discharge circuit is characterized in that: this LCD device electric supply and discharge circuit further comprise a current-limiting resistance, and it is series between the base stage and this controlling signal input end of this npn bipolar transistor.
3. LCD device electric supply as claimed in claim 1 and discharge circuit, it is characterized in that: this LCD device electric supply and discharge circuit further comprise a current-limiting resistance, and it is series between the collector of the grid of this N channel depletion type MOS field-effect transistor and this first npn bipolar transistor.
4. LCD device electric supply as claimed in claim 1 and discharge circuit, it is characterized in that: this LCD device electric supply and discharge circuit further comprise a 3.3V direct supply and a pull-up resistor, and this controlling signal input end is connected to this 3.3V direct supply by this pull-up resistor.
5. LCD device electric supply as claimed in claim 1 and discharge circuit is characterized in that: this LCD device electric supply and discharge circuit further comprise two filter capacitors, and this passes through these two filter capacitor ground connection for discharge end.
6. LCD device electric supply as claimed in claim 1 and discharge circuit is characterized in that: this power supply is a 5V direct supply.
7. LCD device electric supply as claimed in claim 1 and discharge circuit is characterized in that: this controlling signal is a noble potential or an electronegative potential.
8. LCD device electric supply and discharge circuit comprise::
One power supply;
One controlling signal input end, it provides controlling signal;
One for discharge end, is used to LCD device electric supply and discharge;
One the one N channel depletion type MOS field-effect transistor, its grid is connected to this controlling signal input end, source ground, drain electrode is connected to this power supply by one first biasing resistor;
One P-channel enhancement type MOS field-effect transistor, its source electrode is connected to this power supply, and drain electrode is connected to this confession discharge end; With
One the 2nd N channel depletion type MOS field-effect transistor, its grid is connected to the drain electrode of a N channel depletion type MOS field-effect transistor, source ground, drain electrode is connected to for discharge end by one second biasing resistor;
It is characterized in that: the grid of this P-channel enhancement type MOS field-effect transistor is connected to the drain electrode of a N channel depletion type MOS field-effect transistor respectively by a discharge resistance and a diode, and is connected to the source electrode of this P-channel enhancement type MOS field-effect transistor by a charging capacitor.
9. LCD device electric supply and discharge circuit comprise::
One power supply;
One controlling signal input end, it provides controlling signal;
One for discharge end, is used to LCD device electric supply and discharge;
One npn bipolar transistor, its base stage are connected to this controlling signal input end, grounded emitter, and collector is connected to this power supply by a biasing resistor;
One PNP bipolar transistor, its base stage is connected to the collector of this npn bipolar transistor respectively by a discharge resistance and a diode, and be connected to emitter by a charging capacitor, the emitter of this PNP bipolar transistor is connected to this power supply, and the collector of this PNP bipolar transistor is connected to this confession discharge end; With
One N channel depletion type MOS field-effect transistor, its grid is connected to the collector of this npn bipolar transistor, source ground, drain electrode is connected to for discharge end by one second biasing resistor;
It is characterized in that: the base stage of this PNP bipolar transistor is connected to the collector of this npn bipolar transistor respectively by a discharge resistance and a diode, and is connected to the emitter of this PNP bipolar transistor by a charging capacitor.
10. LCD device electric supply and discharge circuit comprise::
One power supply;
One controlling signal input end, it provides controlling signal;
One for discharge end, is used to LCD device electric supply and discharge;
One first npn bipolar transistor, its base stage are connected to this controlling signal input end, grounded emitter, and collector is connected to this power supply by one first biasing resistor;
One P-channel enhancement type MOS field-effect transistor, its grid is connected to the collector of this first npn bipolar transistor respectively by a discharge resistance and a diode, and be connected to source electrode by a charging capacitor, source electrode is connected to this power supply, and drain electrode is connected to this confession discharge end; With
One second npn bipolar transistor, its base stage is connected to the collector of this first npn bipolar transistor, grounded emitter, collector is connected to for discharge end by one second biasing resistor;
It is characterized in that: the grid of this P-channel enhancement type MOS field-effect transistor is connected to the collector of this first npn bipolar transistor respectively by a discharge resistance and a diode, and is connected to the source electrode of this P-channel enhancement type MOS field-effect transistor by a charging capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100730767A CN100573246C (en) | 2007-02-02 | 2007-02-02 | LCD device electric supply and discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100730767A CN100573246C (en) | 2007-02-02 | 2007-02-02 | LCD device electric supply and discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101236316A true CN101236316A (en) | 2008-08-06 |
| CN100573246C CN100573246C (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100730767A Expired - Fee Related CN100573246C (en) | 2007-02-02 | 2007-02-02 | LCD device electric supply and discharge circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332901A (en) * | 2011-08-15 | 2012-01-25 | 苏州佳世达电通有限公司 | Switching circuit and display device |
| CN102487278A (en) * | 2010-12-01 | 2012-06-06 | 晨星软件研发(深圳)有限公司 | Low-leakage I/O circuits and related devices |
| CN109155626A (en) * | 2016-05-20 | 2019-01-04 | 株式会社自动网络技术研究所 | Power supply control apparatus |
| CN114512964A (en) * | 2021-12-14 | 2022-05-17 | 上海芯纬科技有限公司 | An energy storage capacitor protection circuit for electronic detonators |
| CN115313335A (en) * | 2021-05-08 | 2022-11-08 | 圣邦微电子（北京）股份有限公司 | Switch tube grid discharge circuit after load switch input end is fast fallen down |
-
2007
- 2007-02-02 CN CNB2007100730767A patent/CN100573246C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487278A (en) * | 2010-12-01 | 2012-06-06 | 晨星软件研发(深圳)有限公司 | Low-leakage I/O circuits and related devices |
| CN102487278B (en) * | 2010-12-01 | 2017-08-04 | 晨星软件研发(深圳)有限公司 | Low-leakage I/O circuits and related devices |
| CN102332901A (en) * | 2011-08-15 | 2012-01-25 | 苏州佳世达电通有限公司 | Switching circuit and display device |
| CN109155626A (en) * | 2016-05-20 | 2019-01-04 | 株式会社自动网络技术研究所 | Power supply control apparatus |
| CN109155626B (en) * | 2016-05-20 | 2022-03-25 | 株式会社自动网络技术研究所 | Power supply control device |
| CN115313335A (en) * | 2021-05-08 | 2022-11-08 | 圣邦微电子（北京）股份有限公司 | Switch tube grid discharge circuit after load switch input end is fast fallen down |
| CN114512964A (en) * | 2021-12-14 | 2022-05-17 | 上海芯纬科技有限公司 | An energy storage capacitor protection circuit for electronic detonators |
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| Publication number | Publication date |
|---|---|
| CN100573246C (en) | 2009-12-23 |
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Granted publication date: 20091223 Termination date: 20190202 |