CN101101385A - Discharge circuit and liquid crystal display device adopting the discharge circuit - Google Patents
Discharge circuit and liquid crystal display device adopting the discharge circuit Download PDFInfo
- Publication number
- CN101101385A CN101101385A CNA2006100615124A CN200610061512A CN101101385A CN 101101385 A CN101101385 A CN 101101385A CN A2006100615124 A CNA2006100615124 A CN A2006100615124A CN 200610061512 A CN200610061512 A CN 200610061512A CN 101101385 A CN101101385 A CN 101101385A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims description 28
- 239000010409 thin film Substances 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
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Abstract
The invention relates to a discharge circuit, comprising: a first input end, a second input end, a level generating circuit, a transistor and a resistor, where the first input end is connected with the source of the transistor, the second input end is connected with the grid of the transistor through the level generating circuit, the drain of the transistor is earthed through the resistor, the level generating circuit receives a working voltage at the second input end and then generates a high level to turn on the transistor, and external charges are released through a discharge circuit composed of the first input end and the transistor. And the invention provides a LCD adopting the discharge circuit.
Description
Technical field
The invention relates to a kind of discharge circuit and adopt the liquid crystal indicator of this discharge circuit.
Background technology
Liquid crystal indicator is when shutdown or sudden power, the thin film transistor (TFT) of control liquid crystal pixel is in closed condition, but load on closing voltage and can not becoming 0 volt rapidly of this film crystal tube grid, therefore the voltage that loads on the liquid crystal pixel two ends can not discharge rapidly, thereby causes occurring the power-off ghost shadow phenomenon.For this reason, industry development multiple technologies are to improve the power-off ghost shadow phenomenon.
A kind of liquid crystal indicator that improves the power-off ghost shadow phenomenon of prior art is to be connected in series a resistance between this closes voltage input end (Vgl) and ground, that accelerates this film crystal tube grid closes the voltage velocity of discharge, thereby accelerates the velocity of discharge of liquid crystal pixel voltage.
But this liquid crystal indicator also can pass through this resistance continuous discharge when operate as normal, thereby can increase system's extra power consumption.
Summary of the invention
Increase the problem of system's extra power consumption when the operate as normal in order to solve liquid crystal indicator in the prior art, the invention provides a kind of discharge circuit that when operate as normal, does not increase system's extra power consumption.
Be necessary to provide a kind of liquid crystal indicator that adopts this discharge circuit simultaneously.
A kind of discharge circuit, it comprises that a first input end, one second input end, a level produce circuit, a transistor and a resistance, this first input end is connected with this transistor source, this second input end produces circuit by this level and is connected with this transistor gate, and this transistor drain is by this resistance eutral grounding.This level generation circuit produces a high level after this second input end receives an operating voltage makes this transistor turns, the discharge path discharge that extraneous electric charge constitutes by this first input end and this transistor.
A kind of liquid crystal indicator, it comprises a discharge circuit, one drive integrated circult, the plurality of data line, some sweep traces, plurality of thin film transistor and some pixel cells, this drive integrated circult comprises an one scan driver and a data driver, this discharge circuit comprises a first input end, one second input end, one level produces circuit, one transistor and a resistance, this first input end is connected with this transistor source, this second input end produces circuit by this level and is connected with this transistor gate, this transistor drain is by this resistance eutral grounding, this scanner driver is electrically connected with these some sweep traces, this data driver is electrically connected with these some data lines, this plurality of thin film transistor is positioned at the infall of this plurality of data line and these some sweep traces, these some pixel cells are electrically connected with this plurality of thin film transistor, this level generation circuit produces a high level after this second input end receives an operating voltage makes this transistor turns, this plurality of thin film transistor discharges by the discharge path that this first input end and this transistor constitute, thereby accelerates the velocity of discharge of these some pixel cells.
Compared with prior art, the level of discharge circuit of the present invention produces circuit and continues output low level closing this transistor when this liquid crystal indicator operate as normal, thereby does not increase the extra power consumption of system.This level produces circuit and closes or export during sudden power a high level opening this transistor at this liquid crystal indicator, this liquid crystal indicator close voltage input end by this transistor and conductive discharge, thereby can effectively improve the power-off ghost shadow phenomenon.
Description of drawings
Fig. 1 is the synoptic diagram of liquid crystal indicator of the present invention.
Fig. 2 is the circuit module figure of discharge circuit of the present invention.
Fig. 3 is a kind of particular circuit configurations figure that level of the present invention produces circuit.
Embodiment
See also Fig. 1, it is the synoptic diagram of liquid crystal indicator of the present invention.This liquid crystal indicator 2 comprises a data driver 21, one scan driver 22, plurality of data line 211, some sweep traces 221, plurality of thin film transistor 201, some pixel cells 202 and some memory capacitance 203.This scanner driver 22 comprises a discharge circuit 220.
This plurality of data line 211 is electrically connected with this data driver 21, and these some sweep traces 221 are electrically connected with this scanner driver 22.This plurality of thin film transistor 201 is positioned at the infall of this plurality of data line 211 and these some sweep traces 221, its grid is electrically connected with these some sweep traces 221, its source electrode is electrically connected with these some data lines 211, and its drain electrode connects these some pixel cells 202 and these some memory capacitance 203 respectively.
See also Fig. 2, it is the circuit structure diagram of discharge circuit of the present invention.This discharge circuit 220 comprises that a first input end 2201, one second input end 2202, a level produce circuit 2203, a transistor 2204 and a resistance 2205, the grid of this transistor 2204 produces circuit 2203 by this level and is connected with this first input end 2201, the source electrode of this transistor 2204 is connected with this second input end 2202, and the drain electrode of this transistor 2204 is by these resistance 2205 ground connection.This first input end 2201 is used to receive operating voltage, this second input end 2202 is electrically connected with the voltage input end (Vgl) (figure does not show) of closing of this scanner driver 22, this level produces circuit 2203 and produce low level when this first input end 2201 has the operating voltage input, produces high level when these first input end 2201 no operating voltage are imported.A kind of particular circuit configurations of this level generation circuit 2203 as shown in Figure 3, this level produces circuit 2203 and comprises one first phase inverter 2206, one second phase inverter 2207 and a d type flip flop 2208, this first phase inverter 2206 is serially connected between the triggering input end of this first input end 2201 and this d type flip flop 2208, this second phase inverter 2207 is serially connected between the clock control end of this first input end 2201 and this d type flip flop 2208, and the output terminal of this d type flip flop 2208 i.e. the output terminal of this level generation circuit 2203.
During these liquid crystal indicator 2 operate as normal, this level produces circuit 2203 to these transistor 2204 grid output low levels, and this transistor 2204 is closed, and promptly this second input end 2202 disconnects with ground.
Close or during sudden power, this level produces circuit 2203 to this transistor 2204 grids output high level when this liquid crystal indicator 2, this transistor 2204 is opened, i.e. this second input end 2202 and ground conducting.Constituted a discharge path between the source electrode of this second input end 2202, this transistor 2204 and drain electrode, this resistance 2205 and the ground, this voltage of closing voltage input end becomes 0 volt rapidly, this pixel cell 202 is accelerated with memory capacitance 203 velocities of discharge, thereby reaches the purpose of improving power-off ghost shadow.
In liquid crystal indicator 2 of the present invention, this scanner driver 22 can be replaced by a drive integrated circult with this data driver 21, so this discharge circuit 220 also can be arranged in this drive integrated circult.
Compared to prior art, the level of discharge circuit 220 of the present invention produces circuit 2203 and continues output low level closing this transistor 2204 when these liquid crystal indicator 2 operate as normal, thereby does not increase the extra power consumption of system.This level produces circuit 2203 and closes or export a high level to open this transistor 2204 during sudden power at this liquid crystal indicator 2, the voltage input end of closing of this liquid crystal indicator 2 discharges by this transistor 2204 and resistance 2205, thereby can effectively improve the power-off ghost shadow phenomenon.
Claims (6)
1. discharge circuit, it comprises a first input end and a resistance, it is characterized in that: this discharge circuit also comprises one second input end, the living circuit of a level and a transistor, this first input end is connected with this transistor source, this second input end produces circuit by this level and is connected with this transistor gate, this transistor drain is by this resistance eutral grounding, this level generation circuit produces a high level after this second input end receives an operating voltage makes this transistor turns, the discharge path discharge that extraneous electric charge constitutes by this first input end and this transistor.
2. discharge circuit as claimed in claim 1, it is characterized in that: this level produces circuit and comprises two phase inverters and a d type flip flop, wherein a phase inverter is serially connected between the triggering input end of this second input end and this d type flip flop, another phase inverter is serially connected between the clock control end of this second input end and this d type flip flop, and the output terminal of this d type flip flop i.e. the output terminal of this level generation circuit.
3. liquid crystal indicator, it comprises a discharge circuit, one drive integrated circult, the plurality of data line, some sweep traces, plurality of thin film transistor and some pixel cells, this drive integrated circult comprises an one scan driver and a data driver, this scanner driver is electrically connected with these some sweep traces, this data driver is electrically connected with these some data lines, this plurality of thin film transistor is positioned at the infall of this plurality of data line and these some sweep traces, these some pixel cells are electrically connected with this plurality of thin film transistor, this discharge circuit comprises a first input end and a resistance, it is characterized in that: this discharge circuit also comprises one second input end, one level produces a circuit and a transistor, this first input end is connected with this transistor source, this second input end produces circuit by this level and is connected with this transistor gate, this transistor drain is by this resistance eutral grounding, this level generation circuit produces a high level after this second input end receives an operating voltage makes this transistor turns, this plurality of thin film transistor discharges by the discharge path that this first input end and this transistor constitute, thereby accelerates the velocity of discharge of these some pixel cells.
4. liquid crystal indicator as claimed in claim 3, it is characterized in that: this level produces circuit and comprises two phase inverters and a d type flip flop, wherein a phase inverter is serially connected between the triggering input end of this second input end and this d type flip flop, another phase inverter is serially connected between the clock control end of this second input end and this d type flip flop, and the output terminal of this d type flip flop i.e. the output terminal of this level generation circuit.
5. liquid crystal indicator as claimed in claim 3 is characterized in that: this discharge circuit is arranged in this drive integrated circult.
6. liquid crystal indicator as claimed in claim 3 is characterized in that: this discharge circuit is arranged in this scanner driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100615124A CN100492111C (en) | 2006-07-05 | 2006-07-05 | Discharge circuit and liquid crystal display device using the discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100615124A CN100492111C (en) | 2006-07-05 | 2006-07-05 | Discharge circuit and liquid crystal display device using the discharge circuit |
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| Publication Number | Publication Date |
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| CN101101385A true CN101101385A (en) | 2008-01-09 |
| CN100492111C CN100492111C (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100615124A Active CN100492111C (en) | 2006-07-05 | 2006-07-05 | Discharge circuit and liquid crystal display device using the discharge circuit |
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Cited By (24)
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| CN101604515B (en) * | 2008-06-11 | 2012-07-04 | 美格纳半导体有限会社 | Discharge circuit and display device with the same |
| CN103034006A (en) * | 2012-11-23 | 2013-04-10 | 京东方科技集团股份有限公司 | Display module and display |
| CN103165091A (en) * | 2011-12-13 | 2013-06-19 | 乐金显示有限公司 | Liquid crystal display device having discharge circuit and method of driving thereof |
| CN103163673A (en) * | 2011-12-16 | 2013-06-19 | 泰勒斯公司 | Secure display device with twisted nematic liquid crystal matrix |
| WO2014101313A1 (en) * | 2012-12-29 | 2014-07-03 | 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 |
| US9230493B2 (en) | 2012-12-29 | 2016-01-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD device driver circuit, driving method, and LCD device |
| WO2016000353A1 (en) * | 2014-06-30 | 2016-01-07 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN106448529A (en) * | 2015-08-07 | 2017-02-22 | 三星电子株式会社 | Display driver integrated circuit and electronic apparatus including the same |
| CN106652884A (en) * | 2017-03-23 | 2017-05-10 | 京东方科技集团股份有限公司 | Fast discharge circuit, display device, fast discharge method and display control method |
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2006
- 2006-07-05 CN CNB2006100615124A patent/CN100492111C/en active Active
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| CN100492111C (en) | 2009-05-27 |
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