CN100444232C - Discharging circuit and liquid crystal panel drive circuit using the discharging circuit - Google Patents
Discharging circuit and liquid crystal panel drive circuit using the discharging circuit Download PDFInfo
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- CN100444232C CN100444232C CNB200510034948XA CN200510034948A CN100444232C CN 100444232 C CN100444232 C CN 100444232C CN B200510034948X A CNB200510034948X A CN B200510034948XA CN 200510034948 A CN200510034948 A CN 200510034948A CN 100444232 C CN100444232 C CN 100444232C
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Abstract
The present invention provides a discharge circuit connected with a discharge system, which comprises a first switch, a second switch and a third switch, wherein the first switch and the second switch are respectively provided with three ends. The first end of the first switch is connected with the discharge system, the second end is connected with the ground, and the third end is connected with the first end of the second switch. The first end of the second switch is connected with the third end of the first switch, the second end is connected with the third switch and a grounding capacitor, and the third end is connected with a power supply. One end of the third switch is connected with the second end of the second switch, and the other end is connected with the power supply. When the power supply is switched on, the discharge system is switched off; when the power supply is switched off, the residual charge of the discharge system is connected with the ground and is discharged through the discharge circuit. The discharge circuit has the advantages of short discharge time and low power consumption.
Description
[technical field]
The invention relates to the liquid crystal panel drive circuit of a kind of discharge circuit and this discharge circuit of employing.
[background technology]
Liquid crystal panel has electric charge and remains in the panel when shutdown, residual charge makes liquid crystal panel still show inhomogeneous picture after shutdown a period of time, causes ghost and does the demonstration that makes mistake.During to certain voltage, liquid crystal panel just can recover normally, so generally need provide a kind of shutdown residual discharge of electricity circuit up to charge loss.
Please refer to Fig. 1, is a kind of prior art liquid crystal display panel of thin film transistor (ThinFilm Transistor Liquid Crystal Display, TFT-LCD) 1 and the synoptic diagram of its driving circuit 2.This driving circuit 2 comprises gate drivers 21, source electrode driver 23 and discharge circuit 25.This gate drivers 21 and source electrode driver 23 are positioned at the periphery of liquid crystal panel, and this gate drivers 21 comprises gate driving line 211 and diode 213.This gate drivers 21 is connected with the anode of diode 213 by gate driving line 211, and the negative electrode of this diode 213 receives gate drive signal; This gate driving line 211 interconnects by a memory capacitance 215 and common electrode signal line (figure does not show) simultaneously.Supply voltage V
DDBe connected with gate driving line 211, voltage be provided for liquid crystal display panel of thin film transistor 1.This discharge circuit 25 comprises a resistance 255, and the one end is connected with gate driving line 211, its other end ground connection.
When liquid crystal display panel of thin film transistor 1 is in opening, supply voltage V
DDVoltage is provided for this gate driving line 211, this memory capacitance 215 is kept the voltage of (figure does not show) of each pixel in the liquid crystal display panel of thin film transistor 1, makes liquid crystal display panel of thin film transistor 1 normal display image.When liquid crystal display panel of thin film transistor 1 transfers off-mode to, power supply does not provide voltage, and the electric charge that residues in the liquid crystal display panel of thin film transistor 1 discharges by resistance 255.
Adopt stake resistance 255 can discharge remaining electric charge in the liquid crystal display panel of thin film transistor 1, but because the characteristic of resistance itself, when its resistance value is 100,000 ohm, supply voltage is 10 volts, and be 4.18 seconds its discharge time.If adopt the less resistance of resistance value, can be less than 4.18 seconds its discharge time, but can be when power supply be powered discharge time long, consume more high-power.When resistance value was 100,000 ohm, consumed power was 1.05 milliwatts.When resistance value was 10,000 ohm, consumed power was 10.5 milliwatts.When resistance value was 1,000 ohm, consumed power was 105 milliwatts.Therefore, more little its consumed power of resistance value is big more, and resistance value is long big more its discharge time, does not meet the demand of current liquid crystal panel low power consumption.
[summary of the invention]
In order to overcome the shortcoming that discharge time is long and power consumption is high of the residual discharge of electricity circuit of liquid crystal panel in the prior art, be necessary to provide the liquid crystal panel discharge circuit of a kind of discharge time of short and low power consumption and adopt the liquid crystal panel drive circuit of this discharge circuit.
The disclosed technical scheme that solves this technical problem of one better embodiment provides a kind of liquid crystal panel discharge circuit, and it comprises first switch, second switch and the 3rd switch, and this first switch and second switch have three ends respectively; First end of this first switch is connected with this discharge system, the second end ground connection, and the 3rd end is connected with first end of second switch; First end of this second switch is connected with the 3rd end of first switch, and second end links to each other with the 3rd switch and is connected with a direct earth capacitance, and the 3rd end is connected with power supply; One end of the 3rd switch is connected with second end of second switch, and the other end is connected with power supply; When electric power starting, the 3rd switch conduction makes this electric capacity charging and this discharge circuit and this discharge system is opened circuit; When power-off, the voltage of this electric capacity makes first switch and second switch conducting, and discharge system discharges residual charge ground connection by first switch of this discharge circuit.
The disclosed a kind of liquid crystal panel drive circuit of another better embodiment is connected with liquid crystal panel, and this liquid crystal panel drive circuit comprises: a driver and a discharge circuit, this driver receives drive signal by drive wire and is connected with this discharge circuit.This discharge circuit comprises: first switch, second switch and the 3rd switch, and this first switch and second switch have three ends respectively; First end of this first switch is connected with this driver, the second end ground connection, and the 3rd end is connected with first end of second switch; First end of this second switch is connected with the 3rd end of first switch, and second end links to each other with the 3rd switch and is connected with a direct earth capacitance, and the 3rd end is connected with power supply; One end of the 3rd switch is connected with second end of second switch, and the other end is connected with power supply; When electric power starting, the 3rd switch conduction makes this electric capacity charging and this discharge circuit and this driver is opened circuit; When power-off, the voltage of this electric capacity makes first switch and second switch conducting, and first switch by this discharge circuit discharges liquid crystal panel residual charge ground connection.
Compared to prior art, the discharge circuit of above-mentioned liquid crystal panel drive circuit has three switches, because when electric power starting, this discharge circuit opens circuit, therefore consumed power not; When the power supply disconnection, this circuit turn-on can pass through the direct ground connection of lead with the residual electricity of system, thereby realizes rapid discharge and non-consumption systems power realization purpose of power saving.
[description of drawings]
Fig. 1 is the display panels and the discharge circuit synoptic diagram of prior art.
Fig. 2 is display panels of the present invention and discharge circuit synoptic diagram.
[embodiment]
Please refer to Fig. 2, is liquid crystal display panel of thin film transistor 10 of the present invention and its driving circuit 20 synoptic diagram.This driving circuit 20 comprises gate drivers 210, source electrode driver 230 and discharge circuit 250.This gate drivers 210 and source electrode driver 230 are positioned at the periphery of this liquid crystal display panel of thin film transistor 10, this gate drivers 210 comprises gate driving line 2110 and diode 2130, gate driving line 2110 is connected with the anode of diode 2130, and the negative electrode of this diode 2130 receives gate drive signal; This gate driving line 2110 is connected with common electrode signal line (figure does not show) by a memory capacitance 2150 simultaneously.
Supply voltage V
DDBeing connected with gate driving line 2110 by this discharge circuit 250 provides voltage.This discharge circuit 250 comprises NPN type the first transistor 2501, positive-negative-positive transistor seconds 2503, an electric capacity 2507 and a diode 2509.First end of this first transistor 2501 is connected with gate driving line 2110, and second end of this first transistor 2501 is by a resistance 2505 ground connection, and the 3rd end of this first transistor 2501 is connected with first end of transistor seconds 2503.Second end of this transistor seconds 2503 is connected with the negative electrode of direct earth capacitance 2507 with this diode 2509, the 3rd end of this transistor seconds 2503 and supply voltage V
DDBe connected the anode of this diode 2509 and supply voltage V
DDBe connected.
As supply voltage V
DDOpen, this moment the first transistor 2501 and transistor seconds 2503 not conductings, system continues to provide voltage to this gate driving line 2110, this memory capacitance 2150 is kept the voltage of (figure does not show) of each pixel in the liquid crystal display panel of thin film transistor 10, makes liquid crystal display panel of thin film transistor 10 normal display images; Diode 2509 conductings make electric capacity 2507 chargings.
As supply voltage V
DDClose; this moment is because electric capacity 2507 stored charges; first end of transistor seconds 2503 and the second end conducting; first end of this first transistor 2501 and the second end conducting; the electric charge ground connection that residues in the liquid crystal display panel of thin film transistor 10 discharges; consider the protective effect to circuit, discharge charge discharges by stake resistance 2505.
Because discharge circuit 250 adopts the first transistor 2501 and transistor seconds 2503 as switch, when system cut-off, this two-transistor conducting and the first transistor 2501 ground connection effectively discharge the remaining electric charge of liquid crystal panel.Confirm through test, if institute's input voltage is 10 volts, adopt discharge circuit 250 of the present invention, resistance 2505 is little a lot of than prior art resistance, and be 77.6 milliseconds its discharge time; And the discharge circuit of employing prior art, be 4.18 seconds its discharge time, so discharge time of the present invention is short.
Because discharge circuit 250 of the present invention adopts diode 2509 and electric capacity 2507, when system powers, its consumed power is very little almost nil, and the discharge circuit of employing prior art, if discharge resistance is 100 ohm, input voltage is 10 volts, and then its consumed power is 1.05 milliwatts, so consumed power of the present invention is little.
This discharge circuit 250 not only can be used for discharging the residual charge in the liquid crystal panel, also can be applicable in other electronic equipment, also can effectively discharge electric charge fast, and loss system power not.
This discharge circuit also has other change form, as diode 2509 being replaced with transistor.Work as electric power starting, its conducting is to the electric capacity charging and the first transistor 2501 and transistor seconds 2503 are opened circuit; Work as power-off, the first transistor 2501 and transistor seconds 2503 conductings.
Claims (10)
1. discharge circuit, it is connected with discharge system, and this discharge circuit is characterised in that: comprise first switch, second switch and the 3rd switch, this first switch and second switch have three ends respectively; First end of this first switch is connected with this discharge system, the second end ground connection, and the 3rd end is connected with first end of second switch; First end of this second switch is connected with the 3rd end of first switch, and second end links to each other with the 3rd switch and is connected with a direct earth capacitance, and the 3rd end is connected with power supply; One end of the 3rd switch is connected with second end of second switch, and the other end is connected with power supply; When electric power starting, the 3rd switch conduction makes this electric capacity charging and this discharge circuit and this discharge system is opened circuit; When power-off, the voltage of this electric capacity makes first switch and second switch conducting, and discharge system discharges residual charge ground connection by first switch of this discharge circuit.
2. discharge circuit as claimed in claim 1 is characterized in that: this first switch and this second switch are transistors, open circuit conducting when power-off when electric power starting.
3. discharge circuit as claimed in claim 2 is characterized in that: this first switch is a NPN transistor, and this second switch is a PNP transistor.
4. discharge circuit as claimed in claim 1 is characterized in that: the 3rd switch is a diode, and its anode is connected with power supply, and its negative electrode is connected with this second switch.
5. discharge circuit as claimed in claim 1 is characterized in that: second end of this first switch is by a resistance eutral grounding.
6. liquid crystal panel drive circuit, be connected with liquid crystal panel, this liquid crystal panel drive circuit comprises: a driver and a discharge circuit, this driver receives drive signal by drive wire and is connected with this discharge circuit, it is characterized in that: this discharge circuit comprises first switch, second switch and the 3rd switch, and this first switch and second switch have three ends respectively; First end of this first switch is connected with this driver, the second end ground connection, and the 3rd end is connected with first end of second switch; First end of this second switch is connected with the 3rd end of first switch, and second end is connected with the 3rd switch and is connected with a direct earth capacitance, and the 3rd end is connected with power supply; One end of the 3rd switch is connected with second end of second switch, and the other end is connected with power supply; When electric power starting, the 3rd switch conduction makes this electric capacity charging and this discharge circuit and this driver is opened circuit; When power-off, the voltage of this electric capacity makes first switch and second switch conducting, and first switch by this discharge circuit discharges liquid crystal panel residual charge ground connection.
7. liquid crystal panel drive circuit as claimed in claim 6 is characterized in that: this first switch and this second switch are transistors, open circuit conducting when power-off when electric power starting.
8. liquid crystal panel drive circuit as claimed in claim 7 is characterized in that: this first switch is a NPN transistor, and this second switch is a PNP transistor.
9. liquid crystal panel drive circuit as claimed in claim 6 is characterized in that: the 3rd switch is a diode, and its anode is connected with power supply, and its negative electrode is connected with this second switch.
10. liquid crystal panel drive circuit as claimed in claim 6 is characterized in that: second end of this first switch is by a resistance eutral grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510034948XA CN100444232C (en) | 2005-05-28 | 2005-05-28 | Discharging circuit and liquid crystal panel drive circuit using the discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510034948XA CN100444232C (en) | 2005-05-28 | 2005-05-28 | Discharging circuit and liquid crystal panel drive circuit using the discharging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1870114A CN1870114A (en) | 2006-11-29 |
| CN100444232C true CN100444232C (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510034948XA Expired - Fee Related CN100444232C (en) | 2005-05-28 | 2005-05-28 | Discharging circuit and liquid crystal panel drive circuit using the discharging circuit |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388186B (en) * | 2007-09-14 | 2011-11-30 | 奇美电子股份有限公司 | Image display system, LCD and discharging circuit of the LCD |
| JP5261337B2 (en) * | 2009-09-28 | 2013-08-14 | 株式会社ジャパンディスプレイウェスト | Liquid crystal display |
| FR2984578B1 (en) * | 2011-12-16 | 2013-12-20 | Thales Sa | TWO-SECOND LIQUID CRYSTAL SECURED VISUALIZATION DEVICE |
| US9230493B2 (en) | 2012-12-29 | 2016-01-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD device driver circuit, driving method, and LCD device |
| CN102982781B (en) * | 2012-12-29 | 2015-02-18 | 深圳市华星光电技术有限公司 | Drive circuit and drive method for liquid crystal display device and liquid crystal display device |
| CN104464673B (en) * | 2014-12-22 | 2017-06-13 | 南京中电熊猫液晶显示科技有限公司 | Display device and its control method, circuit |
| 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 |
| CN107170416A (en) * | 2017-05-22 | 2017-09-15 | 深圳天珑无线科技有限公司 | The driving method and drive circuit of a kind of LCDs |
| KR102525350B1 (en) * | 2017-09-29 | 2023-04-25 | 엘지전자 주식회사 | Organic light emitting diode display device |
| CN112051783A (en) * | 2020-09-22 | 2020-12-08 | 禹创半导体(深圳)有限公司 | A forced pull-to-ground for data output in a power-free mode |
| CN115240583A (en) * | 2022-09-23 | 2022-10-25 | 广州华星光电半导体显示技术有限公司 | Residual charge releasing circuit and display panel |
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|---|---|---|---|---|
| CN1201967A (en) * | 1997-05-27 | 1998-12-16 | 国际商业机器公司 | Liquid crystal display |
| CN2516996Y (en) * | 2001-08-30 | 2002-10-16 | 神达电脑股份有限公司 | Discharge circuit of liquid-crystal planar display |
| JP2003122311A (en) * | 2001-10-11 | 2003-04-25 | Matsushita Electric Ind Co Ltd | Electrical discharge method and device for image display panel, image display panel, and image display device |
| CN1447306A (en) * | 2002-03-26 | 2003-10-08 | 华邦电子股份有限公司 | Control device and method for eliminating ghost on panels of liquid crystal |
| US20040104908A1 (en) * | 2002-07-12 | 2004-06-03 | Noboru Toyozawa | Liquid crystal display device, method for controlling the same, and portable terminal |
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2005
- 2005-05-28 CN CNB200510034948XA patent/CN100444232C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201967A (en) * | 1997-05-27 | 1998-12-16 | 国际商业机器公司 | Liquid crystal display |
| CN2516996Y (en) * | 2001-08-30 | 2002-10-16 | 神达电脑股份有限公司 | Discharge circuit of liquid-crystal planar display |
| JP2003122311A (en) * | 2001-10-11 | 2003-04-25 | Matsushita Electric Ind Co Ltd | Electrical discharge method and device for image display panel, image display panel, and image display device |
| CN1447306A (en) * | 2002-03-26 | 2003-10-08 | 华邦电子股份有限公司 | Control device and method for eliminating ghost on panels of liquid crystal |
| US20040104908A1 (en) * | 2002-07-12 | 2004-06-03 | Noboru Toyozawa | Liquid crystal display device, method for controlling the same, and portable terminal |
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|---|---|
| CN1870114A (en) | 2006-11-29 |
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Granted publication date: 20081217 Termination date: 20160528 |