CN101546529A - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN101546529A CN101546529A CN200810066351A CN200810066351A CN101546529A CN 101546529 A CN101546529 A CN 101546529A CN 200810066351 A CN200810066351 A CN 200810066351A CN 200810066351 A CN200810066351 A CN 200810066351A CN 101546529 A CN101546529 A CN 101546529A
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- liquid crystal
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Abstract
The invention provides a liquid crystal display device, which comprises a scanning drive circuit, a reset circuit and a charging circuit, wherein the scanning drive circuit is used for outputting a first electrical level and a second electrical level; the charging circuit is used for maintaining the first electrical level after shutdown; and the reset circuit makes all output of the scanning drive circuit select the first electrical level. The liquid crystal display device can quickly and effectively eliminate the remnant shade of the shutdown.
Description
Technical field
The invention relates to a kind of liquid crystal indicator.
Background technology
At present, liquid crystal indicator be widely used in desktop computer, personal digital assistant (Personal Digital Assistant, PDA), portable phone, TV and multiple office automation and audio-visual equipment.In liquid crystal indicator and Related product, when external power source cuts out,, also have afterimage, i.e. power-off ghost shadow phenomenon on the back display screen that can cause shutting down because a large amount of residual charges can't in time discharge in the display panels of liquid crystal indicator.
See also Fig. 1, it is a kind of electrical block diagram of prior art liquid crystal indicator.This liquid crystal indicator 10 comprises an active-matrix 15, a data drive circuit 11 and scan driving circuit 13.This active-matrix 15 comprises many data lines 153 and vertically insulated with it crossing multi-strip scanning line 151, and these many data lines 153 and multi-strip scanning line 151 are divided a plurality of pixel cells 152.Each pixel cell 152 comprises the corresponding with it public electrode 150 that is provided with of a thin film transistor (TFT) 155, a pixel electrode 157 and, this pixel electrode 157 and this public electrode 150 and the liquid crystal layer (figure does not show) that is sandwiched between the two form an electric capacity, are used for storing the GTG signal.The drain electrode of this thin film transistor (TFT) 155 is connected in this pixel electrode 157, and its source electrode is connected in this data line 153, and its grid is connected in this sweep trace 151.
This scan drive circuit 13 is connected with this multi-strip scanning line 151, and the output scanning signal is so that this a plurality of thin film transistor (TFT) 155 conductings or end.This data drive circuit 11 is connected with these many data lines 153, when these a plurality of thin film transistor (TFT) 155 conductings, for these a plurality of pixel cells 152 provide the GTG signal.
Yet during 10 shutdown of this liquid crystal indicator, this a plurality of thin film transistor (TFT)s 155 owing to cut off the power supply end, and residual a large amount of electric charges can't snap-out release in this pixel electrode 157, makes this liquid crystal indicator 10 the power-off ghost shadow phenomenon occur.
Summary of the invention
In order to solve the problem that there is power-off ghost shadow in the prior art liquid crystal indicator, be necessary to provide a kind of liquid crystal indicator that can effectively eliminate power-off ghost shadow.
A kind of liquid crystal indicator, it comprises: scan driving circuit, a reset circuit and a charging circuit.This scan drive circuit is used for exporting one first level and one second level, and it comprises one first a level input end and a reset terminal, and when this reset terminal received reset signal, this first level was all selected in all outputs of this scan drive circuit.This charging circuit comprises a diode, a switching device and an electric capacity, this switching device is opened when this liquid crystal indicator shutdown, it has one first end and one second end, this first end connects the negative electrode of this diode, the anode of this diode connects a direct current power supply, by this capacity earth, this second end is connected in this first level input end to this first end simultaneously.This reset circuit comprises an input end and an output terminal, and this input end connects a direct current power supply, and this output terminal connects the reset terminal of this scan drive circuit, and during this liquid crystal indicator shutdown, this output terminal output reset signal is to this reset terminal.
A kind of liquid crystal indicator, it comprises: scan driving circuit, a reset circuit and a charging circuit.This scan drive circuit is used for exporting one first level and one second level; This charging circuit is used for keeping this first level after shutdown; This reset circuit makes all outputs of this scan drive circuit all select this first level.
Compared with prior art, above-mentioned liquid crystal indicator comprises a reset circuit and a charging circuit, when this liquid crystal indicator shutdown, this charging circuit is to this first level charging, make this level continue to keep a period of time after shutdown, this reset circuit is exported the output of this scan drive circuit of reset enable signal and is all selected this first level, so that these a plurality of pixel cells are opened, discharge residual charge, fast and effeciently eliminate the power-off ghost shadow of this liquid crystal indicator.
Description of drawings
Fig. 1 is a kind of electrical block diagram of prior art liquid crystal indicator.
Fig. 2 is the electrical block diagram of liquid crystal indicator first embodiment of the present invention.
Fig. 3 is the electrical block diagram of the charging circuit of liquid crystal indicator second embodiment of the present invention.
Embodiment
See also Fig. 2, it is the electrical block diagram of liquid crystal indicator first embodiment of the present invention.This liquid crystal indicator 20 comprises an active-matrix 25, a data drive circuit 21, scan driving circuit 23, a reset circuit 27 and a charging circuit 28.This scan drive circuit 23 is used for scanning this active-matrix 25; This data drive circuit 21 is scanned Shi Weiqi in this active-matrix 25 the GTG signal is provided.This reset circuit 27 and this charging circuit 28 are connected to this scan drive circuit 23, discharge the residual charge of this active-matrix 25 in these liquid crystal indicator 20 shutdown backs.
This active-matrix 25 comprises many data lines 251 and vertically insulated with it crossing multi-strip scanning line 253, and these many data lines 251 and this multi-strip scanning line 253 are divided a plurality of pixel cells 252.Each pixel cell 252 comprises the public electrode 250 of a thin film transistor (TFT) 255, a pixel electrode 257 and a corresponding setting with it, this pixel electrode 257 and this public electrode 250 and the liquid crystal layer (figure do not show) that is sandwiched in the two form an electric capacity, are used for storing the GTG signal.The drain electrode of this thin film transistor (TFT) 255 connects this pixel electrode 257, and its source electrode connects this data line 253, and its grid connects this sweep trace 251.
This data drive circuit 21 is by 253 pairs of these a plurality of pixel cell 252 transmission GTG signals of these many data lines, and this scan drive circuit 23 is by 251 pairs of these a plurality of pixel cell 252 transmission sweep signals of this multi-strip scanning line.This scan drive circuit 23 comprises one first level input end (not indicating), one second level input end (figure does not show) and a reset terminal 231.This first level input end receives one first level V
GH, this second level input end receives one second level V
GL, this scan drive circuit 23 optionally exports these two level on the sweep trace 251.This first level V
GHBe about 12 volts, make this thin film transistor (TFT) 255 conductings; This second level V
GLBe about-2 volts, this thin film transistor (TFT) 255 is ended.This scan drive circuit 23 comprises a reset terminal 231, and when this reset terminal 231 received reset signal, the output of this scan drive circuit 23 all was chosen to be this first level V
GH
This charging circuit 28 comprises a diode 280, a current-limiting resistance 283, a transistor 285 and an electric capacity 287.This transistor 285 is a nmos type transistor, its source electrode and grid short circuit, and its grid is by these electric capacity 287 ground connection, and its drain electrode is connected in this first level V
GHInput end, its source electrode is connected with the negative electrode 282 of this diode 281 by this current-limiting resistance 283, the anode 280 of this diode 280 is connected to a direct current power supply AVDD, this direct supply AVDD is about 12 volts.
This reset circuit 27 comprises an input end 271 and an output terminal 272, this input end 271 is connected to a direct current power supply DVDD, this direct supply DVDD is 3.3 volts, this output terminal 272 is connected in the reset terminal 231 of this scan drive circuit 23, the level that detects direct supply DVDD when this input end 271 is during less than 2.7 volts, these output terminal 272 output reset signals.This reset circuit 27 can realize that be the chip that resets of model S-80927C-R shown in Fig. 2, this reset signal is a low level signal with the chip that resets accordingly.
During these liquid crystal indicator 20 operate as normal, this first level V
GHKeep 12 volts of outputs, the drain electrode level of this transistor 285 is higher than its grid level, and this transistor 285 is closed.The level of this anode 281 is higher than the level of this negative electrode 282 and makes this diode 280 conductings, and direct supply AVDD is via this diode 280 and 287 chargings of 283 pairs of these electric capacity of this current-limiting resistance.The direct supply DVDD of these reset circuit 27 detectings keeps 3.3 volts of outputs, and this reset circuit 27 is inoperative to this scan drive circuit 23 this moment.
The shutdown moment of this liquid crystal indicator 20, this direct supply AVDD, DVDD and this first level V
GHDescend rapidly, the level of these transistor 285 source electrodes remains unchanged in a period of time owing to the effect of this electric capacity 287, when this direct supply AVDD drops to level less than this transistor 285 source electrodes, this diode 280 ends, the grid level of this transistor 285 is higher than its drain electrode level and then makes this transistor 285 conductings, this first level V
GHOwing to the effect of this electric capacity 287 continues to keep a period of time.Simultaneously, the input end 271 of this reset circuit 27 detects this direct supply DVDD and drops to below 2.7 volts, its output terminal 272 output reset signals are to the reset terminal 231 of this scan drive circuit 23, and this scan drive circuit 23 all is chosen to be this first level V with its output after receiving this reset signal
GH, then this scan drive circuit 23 is exported this first level V
GHTo all sweep traces 251, make all thin film transistor (TFT) 255 conductings, residual charge on these a plurality of pixel electrodes 257 is released on these many data lines 253 via these a plurality of thin film transistor (TFT)s 255, make the rapid blackening of picture of this liquid crystal indicator 20, eliminate the power-off ghost shadow of this liquid crystal indicator 20 fast.
Compared with prior art, because liquid crystal indicator 20 of the present invention comprises a reset circuit 27 and a charging circuit 28.When these liquid crystal indicator 20 outages, this charging circuit 28 makes this first level V
GHIn a period of time, remain unchanged; This reset circuit 27 makes the output of scan drive circuit 23 all be chosen to be this first level V
GHThis first level V
GHOutput to the grid of each thin film transistor (TFT) 255, make all thin film transistor (TFT) 255 conductings, thereby the residual charge in this active-matrix 25 is discharged, eliminate the power-off ghost shadow of this liquid crystal indicator 20 fast.
See also Fig. 3, it is the charging circuit structural representation of liquid crystal indicator second embodiment of the present invention.The structure of the liquid crystal indicator of the structure of the liquid crystal indicator of this second embodiment and this first embodiment is basic identical, and its key distinction is: the switching device of its charging circuit 38 is a diode 385.The anode 384 of this diode 385 connects current-limiting resistance 383, and by these electric capacity 387 ground connection, its negative electrode 386 connects this first level V
GHInput end (indicate).
Compare with the liquid crystal indicator of this first embodiment, the switching device of the liquid crystal indicator of this second embodiment is a diode 385, and its structure is simple than this transistor 285, can simplify the line construction and the manufacture process thereof of this liquid crystal indicator.
Yet switching device of the present invention is not limited to nmos pass transistor and diode, and other has the device of switching function such as PMOS, MOSFET and JFET can be as switching device of the present invention.
Claims (10)
1. liquid crystal indicator, it comprises scan driving circuit, be used for exporting one first level and one second level, it comprises one first a level input end and a reset terminal, when this reset terminal receives reset signal, this first level is all selected in all outputs of this scan drive circuit, it is characterized in that: this liquid crystal indicator further comprises a charging circuit and a reset circuit, this charging circuit comprises a diode, one switching device and an electric capacity, this switching device is opened when this liquid crystal indicator shutdown, it has one first end and one second end, this first end connects the negative electrode of this diode, the anode of this diode connects a direct current power supply, and by this capacity earth, this second end is connected in this first level input end to this first end simultaneously; This reset circuit comprises an input end and an output terminal, and this input end connects a direct current power supply, and this output terminal connects the reset terminal of this scan drive circuit, and during this liquid crystal indicator shutdown, this output terminal output reset signal is to this reset terminal.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: this switching device is a nmos pass transistor, and the grid of this nmos pass transistor links to each other with source electrode, and its source electrode is first end, and its drain electrode is second end.
3. liquid crystal indicator as claimed in claim 1 is characterized in that: this switching device is a diode, and its anode is first end, and its negative electrode is second end.
4. liquid crystal indicator as claimed in claim 1 is characterized in that: this charging circuit also comprises a current-limiting resistance, and it is connected between the negative electrode and this switching device first end of this diode.
5. liquid crystal indicator as claimed in claim 1 is characterized in that: this reset circuit realizes that by the chip that resets the model of this chip that resets is S-80927C-R, and this reset signal is a low level signal.
6. liquid crystal indicator as claimed in claim 1, it is characterized in that: this liquid crystal indicator further comprises an active-matrix, this active-matrix comprises a plurality of pixel cells that driven by this first level and this second level, each pixel cell comprises a thin film transistor (TFT), conducting when this thin film transistor (TFT) receives this first level ends when receiving this second level.
7. liquid crystal indicator, it comprises scan driving circuit, be used for exporting one first level and one second level, it is characterized in that: this liquid crystal indicator further comprises a charging circuit and a reset circuit, and this charging circuit is used for keeping this first level after shutdown; This reset circuit is used for making all outputs of this scan drive circuit all to select this first level.
8. liquid crystal indicator as claimed in claim 7, it is characterized in that: this scan drive circuit comprises one first level input end, it is used for receiving this first level, this charging circuit comprises a diode, a switching device and an electric capacity, this switching device is opened when this liquid crystal indicator shutdown, it has one first end and one second end, this first end connects the negative electrode of this diode, the anode of this diode connects a direct current power supply, by this capacity earth, this second end is connected in this first level input end to this first end simultaneously.
9. liquid crystal indicator as claimed in claim 7 is characterized in that: this scan drive circuit comprises a reset terminal, and when this reset terminal received reset signal, this first level was all selected in all outputs of this scan drive circuit.
10. liquid crystal indicator as claimed in claim 9, it is characterized in that: this reset circuit comprises an input end and an output terminal, this input end connects a direct current power supply, this output terminal connects the reset terminal of this scan drive circuit, during this liquid crystal indicator shutdown, this output terminal output reset signal is to this reset terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100663517A CN101546529B (en) | 2008-03-28 | 2008-03-28 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100663517A CN101546529B (en) | 2008-03-28 | 2008-03-28 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101546529A true CN101546529A (en) | 2009-09-30 |
| CN101546529B CN101546529B (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100663517A Expired - Fee Related CN101546529B (en) | 2008-03-28 | 2008-03-28 | Liquid crystal display device |
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Cited By (15)
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| CN101968952A (en) * | 2010-07-30 | 2011-02-09 | 南京中电熊猫液晶显示科技有限公司 | Method for improving picture quality of GIP (Gate-in-Panel) liquid crystal display panel |
| CN102054425A (en) * | 2009-11-06 | 2011-05-11 | 三星电子株式会社 | Display driver, method of operating the same, and display device including the same |
| CN101739967B (en) * | 2008-11-12 | 2012-11-07 | 瀚宇彩晶股份有限公司 | Method for eliminating shut-down afterimage of display, control panel and display thereof |
| CN103280199A (en) * | 2013-04-19 | 2013-09-04 | 合肥京东方光电科技有限公司 | Circuit for eliminating shutdown ghost shadows and array substrate |
| CN104575433A (en) * | 2015-02-04 | 2015-04-29 | 京东方科技集团股份有限公司 | GOA reset circuit and driving method, array substrate, display panel and device |
| CN105469751A (en) * | 2014-09-05 | 2016-04-06 | 联咏科技股份有限公司 | Ghost shadow elimination method and driving method, driving device, panel and display system thereof |
| CN105913828A (en) * | 2016-07-05 | 2016-08-31 | 京东方科技集团股份有限公司 | Residual shadow elimination circuit, grid drive circuit and display device |
| CN106125425A (en) * | 2016-06-27 | 2016-11-16 | 南京中电熊猫液晶显示科技有限公司 | Display panels, its driving method and display device |
| CN109003590A (en) * | 2018-08-30 | 2018-12-14 | 京东方科技集团股份有限公司 | Discharge circuit and display device |
| CN109215601A (en) * | 2018-10-24 | 2019-01-15 | 合肥鑫晟光电科技有限公司 | Voltage providing unit, method, display driver circuit and display device |
| CN110012247A (en) * | 2019-03-21 | 2019-07-12 | 深圳康佳电子科技有限公司 | The shutdown compensation method of OLED TV, OLED TV |
| CN110120201A (en) * | 2018-02-07 | 2019-08-13 | 京东方科技集团股份有限公司 | Eliminate circuit, its control method and the liquid crystal display device of power-off ghost shadow |
| CN110264933A (en) * | 2019-06-06 | 2019-09-20 | 惠科股份有限公司 | Driving circuit and display device |
| WO2020015178A1 (en) * | 2018-07-20 | 2020-01-23 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display |
| WO2023123128A1 (en) * | 2021-12-29 | 2023-07-06 | 京东方科技集团股份有限公司 | Power source circuit and driving method therefor, and display apparatus |
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| KR100206567B1 (en) * | 1995-09-07 | 1999-07-01 | 윤종용 | Screen erase circuit and its driving method of tft |
| 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 |
| JP3870862B2 (en) * | 2002-07-12 | 2007-01-24 | ソニー株式会社 | Liquid crystal display device, control method thereof, and portable terminal |
| CN100367327C (en) * | 2003-09-28 | 2008-02-06 | 统宝光电股份有限公司 | Residual image eliminating circuit |
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| CN101739967B (en) * | 2008-11-12 | 2012-11-07 | 瀚宇彩晶股份有限公司 | Method for eliminating shut-down afterimage of display, control panel and display thereof |
| CN102054425A (en) * | 2009-11-06 | 2011-05-11 | 三星电子株式会社 | Display driver, method of operating the same, and display device including the same |
| CN101968952A (en) * | 2010-07-30 | 2011-02-09 | 南京中电熊猫液晶显示科技有限公司 | Method for improving picture quality of GIP (Gate-in-Panel) liquid crystal display panel |
| CN103280199A (en) * | 2013-04-19 | 2013-09-04 | 合肥京东方光电科技有限公司 | Circuit for eliminating shutdown ghost shadows and array substrate |
| CN103280199B (en) * | 2013-04-19 | 2015-08-19 | 合肥京东方光电科技有限公司 | A kind of circuit and array base palte eliminating power-off ghost shadow |
| CN105469751A (en) * | 2014-09-05 | 2016-04-06 | 联咏科技股份有限公司 | Ghost shadow elimination method and driving method, driving device, panel and display system thereof |
| CN104575433A (en) * | 2015-02-04 | 2015-04-29 | 京东方科技集团股份有限公司 | GOA reset circuit and driving method, array substrate, display panel and device |
| CN106125425A (en) * | 2016-06-27 | 2016-11-16 | 南京中电熊猫液晶显示科技有限公司 | Display panels, its driving method and display device |
| CN106125425B (en) * | 2016-06-27 | 2019-08-23 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display panel, its driving method and display device |
| CN105913828A (en) * | 2016-07-05 | 2016-08-31 | 京东方科技集团股份有限公司 | Residual shadow elimination circuit, grid drive circuit and display device |
| CN110120201A (en) * | 2018-02-07 | 2019-08-13 | 京东方科技集团股份有限公司 | Eliminate circuit, its control method and the liquid crystal display device of power-off ghost shadow |
| US11341930B2 (en) | 2018-02-07 | 2022-05-24 | Hefei Boe Display Technology Co., Ltd. | Erasing unit for image sticking, control method thereof, and liquid crystal display device |
| WO2020015178A1 (en) * | 2018-07-20 | 2020-01-23 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display |
| CN109003590A (en) * | 2018-08-30 | 2018-12-14 | 京东方科技集团股份有限公司 | Discharge circuit and display device |
| CN109215601A (en) * | 2018-10-24 | 2019-01-15 | 合肥鑫晟光电科技有限公司 | Voltage providing unit, method, display driver circuit and display device |
| CN109215601B (en) * | 2018-10-24 | 2021-04-27 | 合肥鑫晟光电科技有限公司 | Voltage supply unit, method, display driving circuit and display device |
| CN110012247A (en) * | 2019-03-21 | 2019-07-12 | 深圳康佳电子科技有限公司 | The shutdown compensation method of OLED TV, OLED TV |
| CN110012247B (en) * | 2019-03-21 | 2021-06-22 | 深圳康佳电子科技有限公司 | OLED television shutdown compensation method and OLED television |
| CN110264933A (en) * | 2019-06-06 | 2019-09-20 | 惠科股份有限公司 | Driving circuit and display device |
| WO2023123128A1 (en) * | 2021-12-29 | 2023-07-06 | 京东方科技集团股份有限公司 | Power source circuit and driving method therefor, and display apparatus |
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| CN101546529B (en) | 2011-06-15 |
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