CN100529851C - Liquid crystal display device power supply and discharge circuit - Google Patents
Liquid crystal display device power supply and discharge circuit Download PDFInfo
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- CN100529851C CN100529851C CNB2006100606214A CN200610060621A CN100529851C CN 100529851 C CN100529851 C CN 100529851C CN B2006100606214 A CNB2006100606214 A CN B2006100606214A CN 200610060621 A CN200610060621 A CN 200610060621A CN 100529851 C CN100529851 C CN 100529851C
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Abstract
The invention involves a LCD power supply and discharge circuit, including a power supply, an input control signals, a LCD for the discharge end of a resistor, a first transistor, a second and a third transistor. The first is an NPN transistor-transistor, the base connected to the control signal input emitter grounded, the collector through the resistor connected to the power supply. The second is a P-channel transistors enhanced metal oxide semiconductor field effect transistors, the gate connected to the collector of the first transistor, the source connected to the power supply, drain connected to the LCD for the discharge end. The third is a PNP transistor-transistor, the base connected to the control signal input emitter connected to the LCD for the discharge end, the collector grounding. The LCD supply and discharge circuit includes only one power, and fewer components, wiring is simple.
Description
Technical field
The present invention relates to a kind of LCD device electric supply and discharge circuit.
Background technology
Because advantage such as LCD has gently, approaches, power consumption is little is widely used in modernized information equipments such as TV, notebook computer, mobile phone, personal digital assistant.At present, the application of LCD on market is more and more important.Usually, LCD needs feed circuit that it is powered.In addition, because this LCD internal circuit is a capacitive load, this LCD is still remained after outage a large amount of electric charges, thereby LCD also needs a discharge circuit to discharge 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 confession discharge end 120, one first power supply 130, a second source 140, a first transistor 150, a transistor seconds 160, one the 3rd transistor 170, one first resistance 155, one second resistance 156, one the 3rd resistance 165, one the 4th resistance 175 and one the 5th resistance 176 of a signal input end 110, a LCD.This first power supply 130 is 12V.This second source 140 is 5V.
This first transistor 150 is bipolarity NPN transistor, its base stage 151 is connected to this signal input end 110 by this first resistance 155, emitter 152 is connected to this base stage 151 by this second resistance 156, and these emitter 152 ground connection, collector 153 is connected to this first power supply 130 by the 3rd resistance 165.
This transistor seconds 160 is N channel enhancement mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), its grid 161 is connected to the collector 153 of this first transistor 150, source electrode 162 is connected to the confession discharge end 120 of this LCD, and drain electrode 163 is connected to this second source 140.
The 3rd transistor 170 is bipolarity NPN transistor, its base stage 171 is connected to this signal input end 110 by the 4th resistance 175, emitter 172 ground connection, collector 173 are connected to the confession discharge end 120 of this LCD by the 5th resistance 176.
The principle of work of this LCD device electric supply and discharge circuit 10 is as follows:
When this signal input end 110 is a logic low potential, these the first transistor 150 and the 170 not conductings of the 3rd transistor, this first power supply 130 applies the grid 161 of a 12V voltage to this transistor seconds 160 by the 3rd resistance 165, these transistor seconds 160 conductings, this second source 140 provides the confession discharge end 120 of a 5V voltage to this LCD by this transistor seconds 160, thereby to LCD device electric supply.
When this signal input end 111 is a logic high potential, these the first transistor 150 and 170 conductings of the 3rd transistor, this transistor seconds 160 can't obtain enough voltage at the collector 153 of this first transistor 150 owing to the conducting of this first transistor 150, thereby these transistor seconds 160 not conductings, this moment the 5th, resistance 176 and the 3rd transistor 170 constituted the residual charge that a discharge circuit discharges this LCD inside.
Yet this LCD device electric supply and discharge circuit 10 comprise two power supplys 130,140, make the wiring of this LCD device electric supply and discharge circuit 10 comparatively complicated.
Summary of the invention
In order to solve prior art LCD device electric supply and the discharge circuit comparatively complicated problems that connects up, be necessary to provide comparatively simple liquid crystal display power supply of a kind of wiring and discharge circuit.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a bipolarity NPN transistor, and its base stage is connected to this signal input end, grounded emitter, and collector is connected to this power supply by this resistance.This transistor seconds is a P-channel enhancement type mos field effect transistor, and its grid is connected to the collector of this first transistor, and source electrode is connected to this power supply, and drain electrode is connected to the discharge end that supplies of this LCD.The 3rd transistor is a bipolarity PNP transistor, and its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a bipolarity NPN transistor, and its base stage is connected to this signal input end, grounded emitter, and collector is connected to this power supply by this resistance.This transistor seconds is a P-channel enhancement type mos field effect transistor, and its grid is connected to the collector of this first transistor, and source electrode is connected to this power supply, and drain electrode is connected to the discharge end that supplies of this LCD.The 3rd transistor is a P-channel enhancement type mos field effect transistor, and its grid is connected to this signal input end, and source electrode is connected to the confession discharge end of this LCD, grounded drain.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a bipolarity NPN transistor, and its base stage is connected to this signal input end, grounded emitter, and collector is connected to this power supply by this resistance.This transistor seconds is a bipolarity PNP transistor, and its base stage is connected to the collector of this first transistor, and emitter is connected to this power supply, and collector is connected to the discharge end that supplies of this LCD.The 3rd transistor is a bipolarity PNP transistor, and its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a bipolarity NPN transistor, and its base stage is connected to this signal input end, grounded emitter, and collector is connected to this power supply by this resistance.This transistor seconds is a bipolarity PNP transistor, and its base stage is connected to the collector of this first transistor, and emitter is connected to this power supply, and collector is connected to the discharge end that supplies of this LCD.The 3rd transistor is a P-channel enhancement type mos field effect transistor, and its grid is connected to this signal input end, and source electrode is connected to the confession discharge end of this LCD, grounded drain.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a N channel enhancement mos field effect transistor, and its grid is connected to this signal input end, source ground, and drain electrode is connected to this power supply by this resistance.This transistor seconds is a P-channel enhancement type mos field effect transistor, and its grid is connected to the drain electrode of this first transistor, and source electrode is connected to this power supply, and drain electrode is connected to the discharge end that supplies of this LCD.The 3rd transistor is a bipolarity PNP transistor, and its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a N channel enhancement mos field effect transistor, and its grid is connected to this signal input end, source ground, and drain electrode is connected to this power supply by this resistance.This transistor seconds is a P-channel enhancement type mos field effect transistor, and its grid is connected to the drain electrode of this first transistor, and source electrode is connected to this power supply, and drain electrode is connected to the discharge end that supplies of this LCD.The 3rd transistor is a P-channel enhancement type mos field effect transistor, and its grid is connected to this signal input end, and source electrode is connected to the confession discharge end of this LCD, grounded drain.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance, a first transistor, a transistor seconds and one the 3rd transistor of a power supply, a signal input end, a LCD.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a N channel enhancement mos field effect transistor, and its grid is connected to this signal input end, source ground, and drain electrode is connected to this power supply by this resistance.This transistor seconds is a bipolarity PNP transistor, and its base stage is connected to the drain electrode of this first transistor, and emitter is connected to this power supply, and collector is connected to the discharge end that supplies of this LCD.The 3rd transistor is a P-channel enhancement type mos field effect transistor, and its grid is connected to this signal input end, and source electrode is connected to the confession discharge end of this LCD, grounded drain.
A kind of LCD device electric supply and discharge circuit, it comprises confession discharge end, a resistance of a power supply, a signal input end, a LCD, a first transistor, a transistor seconds and one the 3rd transistor.This signal input end is used for controlling the power supply and the discharge of this LCD.The discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge.This first transistor is a N channel enhancement mos field effect transistor, and its grid is connected to this signal input end, source ground, and drain electrode is connected to this power supply by this resistance.This transistor seconds is a bipolarity PNP transistor, and its base stage is connected to the drain electrode of this first transistor, and emitter is connected to this power supply, and collector is connected to the discharge end that supplies of this LCD.The 3rd transistor is a bipolarity PNP transistor, and its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
Compared with prior art, above-mentioned LCD device electric supply and discharge circuit all include only a power supply, also do not increase other assembly, thereby the wiring of this LCD device electric supply and discharge circuit is comparatively simple.
Description of drawings
Fig. 1 is the synoptic diagram of a kind of prior art LCD device electric supply and discharge circuit.
Fig. 2 is the synoptic diagram of LCD device electric supply of the present invention and discharge circuit first embodiment.
Fig. 3 is the synoptic diagram of LCD device electric supply of the present invention and discharge circuit second embodiment.
Embodiment
Seeing also Fig. 2, is the synoptic diagram of LCD device electric supply of the present invention and discharge circuit first embodiment.This LCD device electric supply and discharge circuit 20 comprise confession discharge end 220, a power supply 230, a first transistor 240, a transistor seconds 250, one the 3rd transistor 260, one first resistance 245, one second resistance 255, one the 3rd resistance 265 and one the 4th resistance 266 of a signal input end 210, a LCD.This power supply 230 is 5V.This signal input end 210 is used for controlling this LCD power supply and the discharge of (figure does not show).The discharge end 220 that supplies of this LCD is used for being this LCD device electric supply and discharge.
This first transistor 240 is bipolarity NPN transistor, and its base stage 241 is connected to this signal input end 210 by this first resistance 245, emitter 242 ground connection, and collector 243 is connected to this power supply 230 by this second resistance 255.
This transistor seconds 250 is a P-channel enhancement type mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), its grid 251 is connected to the collector 243 of this first transistor 240, source electrode 252 is connected to this power supply 230, and drain electrode 253 is connected to the confession discharge end 220 of this LCD.
The 3rd transistor 260 is bipolarity PNP transistor, its base stage 261 is connected to this signal input end 210 by the 3rd resistance 265, emitter 262 by the 4th resistance 266 be connected to this LCD for discharge end 220, collector 263 ground connection.
The principle of work of this LCD device electric supply and discharge circuit 20 is as follows:
When this signal input end 210 is a logic high potential, these the first transistor 240 conductings, the 260 not conductings of the 3rd transistor, the grid 251 of this transistor seconds 250 obtains 0 volt of voltage from the collector 243 of this first transistor 240, these transistor seconds 250 conductings, this power supply 230 provides the confession discharge end 220 of a 5V voltage to this LCD by this transistor seconds 250, thereby to this LCD device electric supply.
When this signal input end 210 is a logic low potential, these the first transistor 240 not conductings, 260 conductings of the 3rd transistor, this power supply 230 applies the grid 251 of a 5V voltage to this transistor seconds 250, these transistor seconds 250 not conductings, this moment, the discharge end 220 that supplies of this LCD discharged the residual charge of this LCD by the 4th resistance 266 and the 3rd transistor 260.
Because this LCD device electric supply and discharge circuit 20 compared with prior art include only a power supply 230, also do not increase other assembly, thereby the wiring of this LCD device electric supply and discharge circuit 20 are comparatively simple.
Seeing also Fig. 3, is the synoptic diagram of LCD device electric supply of the present invention and discharge circuit second embodiment.The LCD device electric supply of this LCD device electric supply and discharge circuit 30 and first embodiment and the difference part of discharge circuit 20 are: this LCD device electric supply and discharge circuit 30 further comprise an electric capacity 346, one end of this electric capacity 346 is connected to the base stage 341 of a first transistor 340, other end ground connection.Wherein, this electric capacity 346 and one first resistance 345 constitute a RC integrating circuit.The logic current potential that this RC integrating circuit can be avoided signal input end 310 is from low to high the time, this first transistor 340 and a transistor seconds 350 unexpected conductings and produce super-high-current when making 5V voltage input LCD.
It is described that LCD device electric supply of the present invention and discharge circuit are not limited to above embodiment, as: in the first embodiment, this the first transistor 240 can be a N channel enhancement mos field effect transistor, its grid 241 is connected to this signal input end 210 by this first resistance 245, source electrode 242 ground connection, drain electrode 243 is connected to this power supply 230 by this second resistance 255.
In the first embodiment, this transistor seconds 250 can be a pair of polarity PNP transistor, its base stage 251 is connected to the collector 243 of this first transistor 240, and emitter 252 is connected to this power supply 230, and collector 253 is connected to the confession discharge end 220 of this LCD;
In the first embodiment, the 3rd transistor 260 can be a P-channel enhancement type mos field effect transistor, its grid 261 is connected to this signal input end 210 by the 3rd resistance 265, source electrode 262 by the 4th resistance 266 be connected to this LCD for discharge end 220,263 ground connection drain.
Claims (10)
1. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a bipolarity NPN transistor, its base stage is connected to this signal input end, grounded emitter, collector is connected to this power supply by this resistance, this transistor seconds is a P-channel enhancement type mos field effect transistor, its grid is connected to the collector of this first transistor, source electrode is connected to this power supply, drain electrode is connected to the discharge end that supplies of this LCD, the 3rd transistor is a bipolarity PNP transistor, its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
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 an electric capacity, and an end of this electric capacity is connected to the base stage of this first transistor, other end ground connection.
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 another resistance, and this another resistance is connected between the base stage and this signal input end of this first transistor.
4. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a bipolarity NPN transistor, its base stage is connected to this signal input end, grounded emitter, collector is connected to this power supply by this resistance, this transistor seconds is a P-channel enhancement type mos field effect transistor, its grid is connected to the collector of this first transistor, source electrode is connected to this power supply, drain electrode is connected to the discharge end that supplies of this LCD, the 3rd transistor is a P-channel enhancement type mos field effect transistor, its grid is connected to this signal input end, source electrode is connected to the confession discharge end of this LCD, grounded drain.
5. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a bipolarity NPN transistor, its base stage is connected to this signal input end, grounded emitter, collector is connected to this power supply by this resistance, this transistor seconds is a bipolarity PNP transistor, its base stage is connected to the collector of this first transistor, emitter is connected to this power supply, collector is connected to the discharge end that supplies of this LCD, the 3rd transistor is a bipolarity PNP transistor, its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
6. LCD device electric supply and discharge circuit, it comprises a power supply, one resistance, one signal input end, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a bipolarity NPN transistor, its base stage is connected to this signal input end, grounded emitter, collector is connected to this power supply by this resistance, this transistor seconds is a bipolarity PNP transistor, its base stage is connected to the collector of this first transistor, emitter is connected to this power supply, collector is connected to the discharge end that supplies of this LCD, the 3rd transistor is a P-channel enhancement type mos field effect transistor, its grid is connected to this signal input end, and source electrode is connected to the confession discharge end of this LCD, grounded drain.
7. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a N channel enhancement mos field effect transistor, its grid is connected to this signal input end, source ground, drain electrode is connected to this power supply by this resistance, this transistor seconds is a P-channel enhancement type mos field effect transistor, its grid is connected to the drain electrode of this first transistor, source electrode is connected to this power supply, drain electrode is connected to the discharge end that supplies of this LCD, the 3rd transistor is a bipolarity PNP transistor, its base stage is connected to this signal input end, emitter is connected to the confession discharge end of this LCD, grounded collector.
8. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a N channel enhancement mos field effect transistor, its grid is connected to this signal input end, source ground, drain electrode is connected to this power supply by this resistance, this transistor seconds is a P-channel enhancement type mos field effect transistor, its grid is connected to the drain electrode of this first transistor, source electrode is connected to this power supply, drain electrode is connected to the discharge end that supplies of this LCD, the 3rd transistor is a P-channel enhancement type mos field effect transistor, its grid is connected to this signal input end, source electrode is connected to the confession discharge end of this LCD, grounded drain.
9. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a N channel enhancement mos field effect transistor, its grid is connected to this signal input end, source ground, drain electrode is connected to this power supply by this resistance, this transistor seconds is a bipolarity PNP transistor, its base stage is connected to the drain electrode of this first transistor, emitter is connected to this power supply, collector is connected to the discharge end that supplies of this LCD, the 3rd transistor is a P-channel enhancement type mos field effect transistor, its grid is connected to this signal input end, source electrode is connected to the confession discharge end of this LCD, grounded drain.
10. LCD device electric supply and discharge circuit, it comprises a power supply, one signal input end, one resistance, the confession discharge end of one LCD, one the first transistor, one transistor seconds and one the 3rd transistor, this signal input end is used for controlling the power supply and the discharge of this LCD, the discharge end that supplies of this LCD is used for being this LCD device electric supply and discharge, this the first transistor is a N channel enhancement mos field effect transistor, its grid is connected to this signal input end, source ground, drain electrode is connected to this power supply by this resistance, this transistor seconds is a bipolarity PNP transistor, its base stage is connected to the drain electrode of this first transistor, emitter is connected to this power supply, collector is connected to the discharge end that supplies of this LCD, the 3rd transistor is a bipolarity PNP transistor, its base stage is connected to this signal input end, and emitter is connected to the confession discharge end of this LCD, grounded collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100606214A CN100529851C (en) | 2006-05-12 | 2006-05-12 | Liquid crystal display device power supply and discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100606214A CN100529851C (en) | 2006-05-12 | 2006-05-12 | Liquid crystal display device power supply and discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101071209A CN101071209A (en) | 2007-11-14 |
| CN100529851C true CN100529851C (en) | 2009-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100606214A Expired - Fee Related CN100529851C (en) | 2006-05-12 | 2006-05-12 | Liquid crystal display device power supply and discharge circuit |
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| CN (1) | CN100529851C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101458901B (en) * | 2007-12-12 | 2011-06-15 | 群康科技(深圳)有限公司 | Power supply circuit for LCD |
| CN108919577A (en) * | 2018-06-05 | 2018-11-30 | 信利半导体有限公司 | A kind of super low-power consumption film transistor display panel |
| CN111703364A (en) * | 2020-06-22 | 2020-09-25 | 深圳市元征科技股份有限公司 | Single-wire control indicator lamp state switching circuit and vehicle-mounted electronic equipment |
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2006
- 2006-05-12 CN CNB2006100606214A patent/CN100529851C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101071209A (en) | 2007-11-14 |
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Granted publication date: 20090819 Termination date: 20210512 |