CN101101386A - Power supply and discharge circuit of liquid-crystal panel - Google Patents
Power supply and discharge circuit of liquid-crystal panel Download PDFInfo
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- CN101101386A CN101101386A CNA2006100615181A CN200610061518A CN101101386A CN 101101386 A CN101101386 A CN 101101386A CN A2006100615181 A CNA2006100615181 A CN A2006100615181A CN 200610061518 A CN200610061518 A CN 200610061518A CN 101101386 A CN101101386 A CN 101101386A
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- crystal panel
- liquid crystal
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Abstract
The invention provides a LCD panel power supply and discharge circuit, comprising: a control signal input end, a power supply, a first transistor, a second transistor, a switch, a resistor, and a power supply and discharge end, where the control signal input end is used to control power supply and discharge of the LCD panel, the power supply and discharge end is used to supply power to the LCD panel and discharge for the LCD panel; the base of the first transistor is connected with the control signal input end, the collector of the first transistor is connected with the grid of the second transistor, and connected with the power supply through the resistor, and the emitter of the first transistor is earthed; the drain of the second transistor is connected with the power supply, the source of the second transistor is connected with the power supply and discharge end; the switch is connected in series between the collector of the first transistor and the power supply and discharge end.
Description
Technical field
The invention relates to a kind of liquid crystal panel power supply and discharge circuit.
Background technology
See also Fig. 1, it is the circuit diagram of a kind of prior art liquid crystal panel power supply and discharge circuit.This liquid crystal panel power supply and discharge circuit 1 comprise that a signal input end 11, a power supply 12, a first transistor 13, a transistor seconds 14, one the 3rd transistor 15, supply discharge end 16, one first resistance 17 and one second resistance 18.This signal input end 11 is used to receive the pulse enable signal of sending here in the external world, and this power supply 12 is one 5 volts of power supplys, and this confession discharge end 16 is connected with a liquid crystal panel (figure does not show).This first transistor 13 is the positive-negative-positive bipolar transistor, and this transistor seconds 14 is a npn type bipolar transistor, and the 3rd transistor 15 is the P-channel enhancement type metal oxide semiconductcor field effect transistor.The base stage of this first transistor 13 is connected with this signal input end 11 by a resistance, the emitter of this first transistor 13 is connected with the grid of the 3rd transistor 15, the emitter of this first transistor 13 is connected the grounded collector of this first transistor 13 by this first resistance 17 with this power supply 12 simultaneously.The base stage of this transistor seconds 14 is connected with this signal input end 11 by a resistance, and the collector of this transistor seconds 14 is connected the grounded emitter of this transistor seconds 14 by this second resistance 18 with this confession discharge end 16.The drain electrode of the 3rd transistor 15 is connected with this power supply 12, and the source electrode of the 3rd transistor 15 is connected with this confession discharge end 16.
When this signal input end 11 receives a low level pulse enable signal, these the first transistor 13 conductings, this transistor seconds 14 ends.After these the first transistor 13 conductings, the 3rd transistor 15 grids are dragged down is low level, 15 conductings of the 3rd transistor, and promptly this power supply 12 constitutes path with this for discharge end 16, and this direct current+5 volt power supply continues to this liquid crystal panel power supply, to guarantee its operate as normal.
When this signal input end 11 received one+5 volt of high level pulse enable signal, this first transistor 13 ended, these transistor seconds 14 conductings.The 3rd transistor 15 grids are drawn high is high level, and the 3rd transistor 15 ends, and promptly this power supply 12 disconnects for discharge end 16 with this.The dump energy that this liquid crystal panel stores bleeds off by the discharge path that this confession discharge end 16, this second resistance 18 and this transistor seconds 14 constitute.
But this first transistor 13 is controlled by this signal input end 11 simultaneously with this transistor seconds 14, and when this signal input end 11 received a control signal, this first transistor 13 can interact with this transistor seconds 14.When accident appears in this control signal, this first transistor 13 and this transistor seconds 14 conductings simultaneously, the also conducting thereupon of the 3rd transistor 15, these power supply 12 shorted to earths, thus this liquid crystal panel internal circuit can be burnt.
Summary of the invention
In order to solve liquid crystal panel power supply and discharge circuit interactive problem in power supply and discharge process in the prior art, the invention provides a kind of power supply can interactive liquid crystal panel power supply and discharge circuit with discharge.
A kind of liquid crystal panel power supply and discharge circuit, it comprises that a signal input end, a power supply, a first transistor, a transistor seconds, a switch, a resistance and one are for discharge end.This signal input end is used to control the power supply and the discharge of this liquid crystal panel, and this confession discharge end is used to this liquid crystal panel power supply and discharge.The base stage of this first transistor is connected with this signal input end, and the collector of this first transistor is connected with the grid of this transistor seconds, and the collector of this first transistor is connected the grounded emitter of this first transistor by this resistance simultaneously with this power supply.The drain electrode of this transistor seconds is connected with this power supply, and the source electrode of this transistor seconds is connected with this confession discharge end.This switch series is connected between this first transistor collector and this confession discharge end.
Compared with prior art, liquid crystal panel power supply of the present invention and discharge circuit are controlled this switch by this first transistor, when this first transistor ends, and this switch conduction; When this first transistor conducting, this switch reliably ends, thereby power supply and discharge process can not interacted, and can better protect liquid crystal panel internal circuit.
Description of drawings
Fig. 1 is the circuit diagram of a kind of prior art liquid crystal panel power supply and discharge circuit.
Fig. 2 is the circuit diagram of liquid crystal panel power supply of the present invention and discharge circuit first embodiment.
Fig. 3 is the circuit diagram of liquid crystal panel power supply of the present invention and discharge circuit second embodiment.
Embodiment
See also Fig. 2, it is the circuit diagram of liquid crystal panel power supply of the present invention and discharge circuit first embodiment.This liquid crystal panel power supply and discharge circuit 2 comprise that a signal input end 21, a power supply 22, a first transistor 23, a transistor seconds 24, one the 3rd transistor 25, supply discharge end 26, one first resistance 27 and a holding circuit 20.This signal input end 21 is used to receive the pulse enable signal of sending here in the external world, and this power supply 22 is one 5 volts of power supplys, and this confession discharge end 26 is connected with a liquid crystal panel (figure does not show).This first transistor 23 is a npn type bipolar transistor, and this transistor seconds 24 is a N channel enhancement metal oxide semiconductcor field effect transistor, and the 3rd transistor 25 is the P-channel enhancement type metal oxide semiconductcor field effect transistor.This holding circuit 20 comprises an electric capacity 201, one second resistance 202 and one the 3rd resistance 203.The base stage of this first transistor 23 is connected with this signal input end 21 by this second resistance 202, the base stage of this first transistor 23 is simultaneously by the 3rd resistance 203 and electric capacity 201 ground connection in parallel, the collector of this first transistor 23 is connected with the grid of the 3rd transistor 25, the collector of this first transistor 23 is connected with this power supply 22 by this first resistance 27 simultaneously, the collector of this first transistor 23 is connected the grounded emitter of this first transistor 23 by a resistance with the grid of this transistor seconds 24 simultaneously.The grounded drain of this transistor seconds 24, the source electrode of this transistor seconds 24 is connected with this confession discharge end 26.The drain electrode of the 3rd transistor 25 is connected with this power supply 22, and the source electrode of the 3rd transistor 25 is connected with this confession discharge end 26.
When this signal input end 21 receives one+5 volt of high level pulse enable signal, these the first transistor 23 conductings, the grid of this second, third transistor 24,25 is all drawn to be low level, this transistor seconds 24 ends, 25 conductings of the 3rd transistor, promptly this power supply 22 constitutes path with this for discharge end 26, and this direct current+5 volt power supply will continue to this liquid crystal panel power supply, to guarantee its operate as normal.
When this signal input end 21 received a low level pulse enable signal, this first transistor 23 ended, and the 3rd transistor 25 ends.At this moment, the grid of this transistor seconds 24 is a high level, these transistor seconds 24 conductings, and the dump energy that this liquid crystal panel stores bleeds off by the discharge path that this confession discharge end 26 and this transistor seconds 24 constitute.
The pulse enable signal that receives when this signal input end 21 changes when very fast, this second resistance 202 constitutes a buffer circuit with this electric capacity 201, can stop this first transistor 23 unexpected conductings, thereby guarantee that this power supply 22 does not have big impact when giving this liquid crystal panel power supply.
When this signal input end 21 was in suspended state, the 3rd resistance 203 can guarantee that these the first transistor 23 base stages are electronegative potential, thereby this first transistor 23 is reliably ended.
Compared with prior art, liquid crystal panel power supply of the present invention and discharge circuit 2 are controlled these transistor secondses 24 by this first transistor 23, when this first transistor 23 ends, and these transistor seconds 24 conductings; When these the first transistor 23 conductings, this transistor seconds 24 reliably ends, thereby power supply and discharge process can not interacted, and can better protect liquid crystal panel internal circuit.
See also Fig. 3, it is the circuit diagram of liquid crystal panel power supply of the present invention and discharge circuit second embodiment.The circuit structure of this liquid crystal panel power supply and the discharge circuit 3 and first embodiment is roughly the same, its difference is: this transistor seconds 34 is a positive-negative-positive bipolar transistor, these transistor seconds 34 base stages are connected with these the first transistor 33 collectors by a resistance, its emitter is connected its grounded collector by a resistance with this confession discharge end 36.
Claims (10)
1. a liquid crystal panel is powered and discharge circuit, it comprises a signal input end, one power supply, one the first transistor, one transistor seconds, one switch, one resistance and one is for discharge end, this signal input end is used to control the power supply and the discharge of this liquid crystal panel, this confession discharge end is used to this liquid crystal panel power supply and discharge, the base stage of this first transistor is connected with this signal input end, the collector of this first transistor is connected with the grid of this transistor seconds, the collector of this first transistor is connected with this power supply by this resistance simultaneously, the grounded emitter of this first transistor, the drain electrode of this transistor seconds is connected with this power supply, the source electrode of this transistor seconds is connected with this confession discharge end, it is characterized in that: this switch series is connected between this first transistor collector and this confession discharge end.
2. liquid crystal panel power supply as claimed in claim 1 and discharge circuit, it is characterized in that: this switch is a field-effect transistor, this field-effect transistor grid connects this first transistor base stage, and this field-effect transistor source electrode connects this confession discharge end, this field-effect transistor grounded drain.
3. liquid crystal panel power supply as claimed in claim 2 and discharge circuit, it is characterized in that: this field-effect transistor is a N channel enhancement metal oxide semiconductcor field effect transistor.
4. liquid crystal panel power supply as claimed in claim 1 and discharge circuit, it is characterized in that: this switch is a bipolar transistor, this bipolar transistor base stage connects this first transistor base stage, and this bipolar transistor pipe collector connects this confession discharge end, this bipolar transistor grounded emitter.
5. liquid crystal panel power supply as claimed in claim 4 and discharge circuit, it is characterized in that: this switch is a npn type bipolar transistor.
6. liquid crystal panel as claimed in claim 1 power supply and discharge circuit is characterized in that: be connected in series a holding circuit between this first transistor base stage and this signal input end, this holding circuit is stablized the control signal that loads on this first transistor base stage.
7. liquid crystal panel power supply as claimed in claim 6 and discharge circuit; it is characterized in that: this holding circuit comprises one first resistance, one second resistance and an electric capacity; this first resistance string is connected between this first transistor base stage and this signal input end; this second resistance string is connected between this first transistor base stage and the ground, and this capacitance series is between this first transistor base stage and ground.
8. liquid crystal panel power supply as claimed in claim 1 and discharge circuit is characterized in that: this liquid crystal panel power supply and discharge circuit further comprise another resistance, and this resistance string is connected between this switch and this first transistor collector.
9. liquid crystal panel power supply as claimed in claim 1 and discharge circuit, it is characterized in that: this first transistor is a npn type bipolar transistor, this transistor seconds is a P-channel enhancement type metal oxide semiconductcor field effect transistor.
10. liquid crystal panel power supply as claimed in claim 1 and discharge circuit, it is characterized in that: this power supply is 5 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100615181A CN100468137C (en) | 2006-07-05 | 2006-07-05 | Power supply and discharge circuit of liquid-crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100615181A CN100468137C (en) | 2006-07-05 | 2006-07-05 | Power supply and discharge circuit of liquid-crystal panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101101386A true CN101101386A (en) | 2008-01-09 |
| CN100468137C CN100468137C (en) | 2009-03-11 |
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ID=39035733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100615181A Expired - Fee Related CN100468137C (en) | 2006-07-05 | 2006-07-05 | Power supply and discharge circuit of liquid-crystal panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100468137C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883205A (en) * | 2010-05-26 | 2010-11-10 | 友达光电股份有限公司 | Circuit for checking input signals and relative liquid crystal display television |
| CN105259719A (en) * | 2015-09-22 | 2016-01-20 | 成都天马微电子有限公司 | Discharging circuit of display panel, and display device |
-
2006
- 2006-07-05 CN CNB2006100615181A patent/CN100468137C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883205A (en) * | 2010-05-26 | 2010-11-10 | 友达光电股份有限公司 | Circuit for checking input signals and relative liquid crystal display television |
| CN101883205B (en) * | 2010-05-26 | 2013-04-17 | 友达光电股份有限公司 | Circuit for checking input signals and relative liquid crystal display television |
| CN105259719A (en) * | 2015-09-22 | 2016-01-20 | 成都天马微电子有限公司 | Discharging circuit of display panel, and display device |
| CN105259719B (en) * | 2015-09-22 | 2018-05-18 | 成都天马微电子有限公司 | The discharge circuit and display device of a kind of display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100468137C (en) | 2009-03-11 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20190705 |