CN101546536A - Liquid crystal display having function of eliminating power-off ghost shadow - Google Patents
Liquid crystal display having function of eliminating power-off ghost shadow Download PDFInfo
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- CN101546536A CN101546536A CN200810088413A CN200810088413A CN101546536A CN 101546536 A CN101546536 A CN 101546536A CN 200810088413 A CN200810088413 A CN 200810088413A CN 200810088413 A CN200810088413 A CN 200810088413A CN 101546536 A CN101546536 A CN 101546536A
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Abstract
The invention relates to a liquid crystal display having a function of eliminating power-off ghost shadow. The liquid crystal display comprises a display panel, a power supply device, a source driver and a gate driver. The source driver comprises a hysteresis function comparator and a level conversion unit. The hysteresis function comparator is used for comparing a power supply voltage supplied by the power supply device with a reference voltage. The level conversion unit is coupled with the output end of the hysteresis function comparator and is used for generating a control signal. The gate driver turns on a plurality of scanning lines of the display panel according to the control signal.
Description
Technical field
The present invention relates to a kind of LCD, especially relate to a kind of LCD with function of eliminating power-off ghost shadow.
Background technology
The main cause that causes LCD generation power-off ghost shadow at present is for when the power supply of LCD is closed, the pixel electrode velocity of discharge of display panel is too slow, make postboost residual charge in time to discharge and residue in the liquid crystal capacitance, produce shutdown back LCD and also have afterimage, be power-off ghost shadow.
Please refer to Fig. 1, Fig. 1 is the driving sequential chart of LCD.The thin film transistor (TFT) of prior art (TFT) LCD comprises display panel and backlight module.When the TFT LCD is started shooting, open earlier the power supply (shown in curve A) of TFT LCD at sequential t1, comprise the shared electrode that puts on the TFT LCD and the voltage on the pixel electrode.Then, to the dot structure of TFT LCD, open backlight module (shown in curve C) in sequential t3 more afterwards, so that the display panel light source to be provided, and then make the TFT liquid crystal display displays go out image at sequential t2 input image signal (shown in curve B).The sequential of shutdown is then opposite with its start sequential.It earlier closes backlight module at sequential t4, and the image signal that inputs to dot structure finishes fully at sequential t5, then closes the power supply of TFT LCD afterwards in sequential.
From the above, before after closing backlight module, finishing with image signal, just sequential t4 to t5 during this period of time in, because image signal still is present in the dot structure, and pixel electrode still has residual charge, and these residual charges there is no effective discharge path, thus must be after after a while discharge off fully.Therefore, after the shutdown of TFT LCD, tend to after sequential t6, ghost phenomena take place.
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of the LCD 10 of the power-off ghost shadow eliminated of prior art.LCD 10 comprises a power supply unit 11, a voltage-level detector 12, a display panel 13, a gate drivers 14 and source electrode driver 15.Power supply unit 11 provides a supply voltage VCC to source electrode driver 15 and gate drivers 14.Simultaneously, power supply unit 11 also provides supply voltage VCC to voltage-level detector 12, and voltage-level detector 12 can compare a supply voltage VCC and a reference voltage.When LCD 10 shutdown, supply voltage VCC drops to the level that is lower than this reference voltage, this moment, voltage-level detector 12 can send a controlling signal XAO to gate drivers 14, gate drivers 14 is after receiving controlling signal XAO, thin film transistor (TFT) on the display panel 13 is all opened, residual charge is effectively discharged, therefore can improve power-off ghost shadow.
In sum, the LCD of prior art uses the voltage-level detector of an outside to detect the level of supply voltage after sequential t6.When detecting supply voltage and be lower than the level of reference voltage, voltage-level detector can be exported controlling signal to gate drivers, mechanism with the elimination power-off ghost shadow of primer fluid crystal display, gate drivers will be opened all thin film transistor (TFT)s of display panel this moment, residual charge is discharged, reach the purpose of eliminating power-off ghost shadow.
Summary of the invention
Therefore, one of purpose of the present invention is to provide a kind of LCD with function of eliminating power-off ghost shadow.
The invention provides a kind of LCD with function of eliminating power-off ghost shadow, comprise: a display panel comprises multi-strip scanning line and many data lines; One power supply unit is used for exporting a supply voltage; The one source pole driver comprises: a plurality of output channels are coupled to this many data lines; An one lag function comparer and a level translator are coupled to the output terminal of this lag function comparer, are used for producing a controlling signal; And a gate drivers, being coupled to this multi-strip scanning line, this gate drivers is opened this multi-strip scanning line according to this controlling signal.
The present invention also provides a kind of LCD with function of eliminating power-off ghost shadow, comprises: a display panel comprises multi-strip scanning line and many data lines; One power supply unit is used for exporting a supply voltage; One gate drivers is coupled to this multi-strip scanning line, comprises one first testing circuit, is used for this supply voltage and a reference voltage are compared, and produces one first controlling signal, and this gate drivers is opened this multi-strip scanning line according to this first controlling signal; And one source pole driver, be coupled to this many data lines, comprise one second testing circuit, be used for this supply voltage and this reference voltage are compared, and producing one second controlling signal, this source electrode driver is exported identical image signal in these many data lines according to this second controlling signal.
Description of drawings
Fig. 1 is the driving sequential chart of LCD.
Fig. 2 is the synoptic diagram of the LCD of the power-off ghost shadow eliminated of prior art.
Fig. 3 is the synoptic diagram of first embodiment of LCD of the present invention.
Fig. 4 is the synoptic diagram of source electrode driver among Fig. 3.
Fig. 5 is the oscillogram of signal of the source electrode driver of Fig. 4.
Fig. 6 is the synoptic diagram of second embodiment of LCD of the present invention.
The reference numeral explanation
10,20,40 LCD, 11,24 power supply units
12 voltage-level detectors, 13,22 display panels
14,28 gate drivers, 15,26 source electrode drivers
30 testing circuits, 32 lag function comparers
34 level translators, 36 first phase inverters
38 second phase inverters, 42 first testing circuits
44 second testing circuits
VCC voltage source XAO controlling signal
The GND ground voltage
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of first embodiment of LCD of the present invention.LCD 20 comprises a display panel 22, a power supply unit 24, one source pole driver 26 and a gate drivers 28.Power supply unit 24 provides a supply voltage VCC to source electrode driver 26 and gate drivers 28.Display panel 22 comprises multi-strip scanning line and many data lines, is used for controlling a plurality of thin film transistor (TFT)s of demonstration.LCD 20 has the function of eliminating power-off ghost shadow, by being arranged at a testing circuit 30 of source electrode driver 26, can detect the supply voltage VCC that power supply unit 24 provides, therefore when LCD 20 shutdown, source electrode driver 26 will be sent a controlling signal XAO to gate drivers 28.Gate drivers 28 will be opened the multi-strip scanning line after receiving controlling signal XAO, to open all thin film transistor (TFT)s on the display panel 22, the residual charge on the display panel 22 is discharged.According to present embodiment, LCD 20 of the present invention can utilize source electrode driver 26 to judge the shutdown action of LCD 20, after confirming that LCD 20 is carried out the shutdown action, source electrode driver 26 output controlling signal XAO give gate drivers 28, gate drivers 28 is opened all thin film transistor (TFT)s on the display panel 22 after receiving controlling signal XAO, discharging the residual charge in the liquid crystal capacitance, and then improve the power-off ghost shadow of LCD 20.
Please refer to Fig. 4, Fig. 4 is the synoptic diagram of source electrode driver 26 among Fig. 3.Source electrode driver 26 comprises a plurality of output channels (Y1-Yn), a plurality of switch SW, a lag function comparer 32, a level translator 34, one first phase inverter 36 and one second phase inverter 38.The negative input end of lag function comparer 32 receives a reference voltage VR, so lag function comparer 32 can produce a first threshold voltage VTL and one second threshold voltage VTH according to reference voltage VR.As supply voltage VCC during less than first threshold voltage VTL, lag function comparer 32 outputs one low level voltage.As supply voltage VCC during greater than the second threshold voltage VTH, lag function comparer 32 outputs one high level voltage.Level translator 34 is coupled to the output terminal of lag function comparer 32, is used for adjusting the level of the output voltage of lag function comparer 32, to produce a controlling signal XAO.First phase inverter 36 and second phase inverter, 38 coupled in series are in the output terminal of this level translator 34, the driving force of the signal XAO that is used for tightening control.A plurality of switch SW are respectively coupled between each output channel (Y1-Yn), the unlatching of a plurality of switch SW and close by controlling signal XAO and controlled.When controlling signal XAO starts the function of eliminating power-off ghost shadow, gate drivers 28 will be opened the multi-strip scanning line of display panel 22, and the residual charge on the display panel 22 is discharged.In addition, a plurality of switch SW of source electrode driver 26 also will be unlocked, the residual charge that still has on the display panel 22 like this makes a plurality of output channels (Y1-Yn) carry out electric charge and shares (charge sharing), even also can be not easy to be discovered because the picture of display panel 22 outputs is consistent.
Please refer to Fig. 5, Fig. 5 is the oscillogram of signal of the source electrode driver 26 of Fig. 4.As supply voltage VCC during less than first threshold voltage VTL, controlling signal XAO will be moved to ground voltage GND fast to start the function of eliminating power-off ghost shadow.Yet, because after starting the residual function of elimination shutdown, gate drivers 28 is opened all sweep traces of display panel 22, may cause supply voltage VCC to produce the phenomenon of disturbance, therefore the function that adds hysteresis circuitry, as supply voltage VCC during greater than the second threshold voltage VTH, controlling signal XAO just can stop to eliminate the function of power-off ghost shadow, eliminates the function of power-off ghost shadow in the time of so can guaranteeing LCD 20 shutdown and can move normally.
Please refer to Fig. 6, Fig. 6 is the synoptic diagram of second embodiment of LCD of the present invention.LCD 40 comprises a power supply unit 24, a display panel 22, a gate drivers 28 and one source pole driver 26.Display panel 22 comprises multi-strip scanning line and many data lines, is used for controlling apparent a plurality of thin film transistor (TFT)s.Gate drivers 28 is coupled to the multi-strip scanning line, comprises one first testing circuit 43, is used for a supply voltage VCC and a reference voltage are compared, and produces one first controlling signal.When LCD 40 shutdown, first testing circuit 43 will detect supply voltage VCC, when supply voltage VCC is reduced to this level below reference voltage, gate drivers 28 will be opened the multi-strip scanning line, to open all thin film transistor (TFT)s of display panel 22, the residual charge on the display panel 22 is discharged.Source electrode driver 26 is coupled to many data lines, comprise one second testing circuit 44, be used for supply voltage VCC and this reference voltage are compared, and produce one second controlling signal, therefore source electrode driver 26 also can detect the level of the supply voltage VCC that power supply unit 24 provides, increases and judges LCD 40 shutdown accuracy of actions.In addition, when supply voltage VCC is reduced to level below the reference voltage, source electrode driver 26 will be exported identical image signal in many data lines.So, residual charge is effectively discharged before LCD 40 shutdown, also can not produce uneven display frame because of residual charge.According to present embodiment, the shutdown action that LCD 40 can utilize first testing circuit 43 of gate drivers 28 to judge, when LCD 40 shutdown, gate drivers 28 will be opened all sweep traces.Moreover second testing circuit 44 that LCD 40 can sharp source electrode driver 26 is judged the shutdown action of LCD 40 simultaneously, and when LCD 40 shutdown, source electrode driver 26 will be exported identical image signal in all data lines.
In sum, the invention provides a kind of LCD of eliminating power-off ghost shadow.LCD of the present invention comprises a display panel, a power supply unit, one source pole driver and a gate drivers.According to embodiments of the invention, can utilize this source electrode driver to detect the shutdown action of this LCD, or this source electrode driver and this gate drivers detect the shutdown action of this LCD simultaneously.In first embodiment, this source electrode driver comprises a lag function comparer.A supply voltage and a reference voltage that this lag function comparer is used for power supply unit is provided compare.This level translator is coupled to the output terminal of this lag function comparer, is used for producing a controlling signal.This gate drivers is opened the multi-strip scanning line of this display panel according to this controlling signal.In a second embodiment, this gate drivers comprises one first testing circuit, be used for this supply voltage and this reference voltage are compared, and produce one first controlling signal, this gate drivers is opened the multi-strip scanning line of this display panel according to this first controlling signal.In addition, this source electrode driver comprises one second testing circuit, be used for this supply voltage and this reference voltage are compared, and produce one second controlling signal, this source electrode driver is exported identical image signal in many data lines of this display panel according to this second controlling signal.Therefore, but the residual charge of this this display panel of LCD snap-out release and make picture present consistance.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (9)
1. LCD with function of eliminating power-off ghost shadow comprises:
One display panel comprises multi-strip scanning line and many data lines;
One power supply unit is used for exporting a supply voltage;
The one source pole driver comprises:
A plurality of output channels are coupled to this many data lines;
One lag function comparer; And
One level translator is coupled to the output terminal of this lag function comparer, is used for producing a controlling signal; And
One gate drivers is coupled to this multi-strip scanning line, and this gate drivers is opened this multi-strip scanning line according to this controlling signal.
2. LCD as claimed in claim 1, wherein this source electrode driver also comprises one first phase inverter and one second phase inverter coupled in series in the output terminal of this level translator.
3. LCD as claimed in claim 1, wherein this source electrode driver also comprises a plurality of switches and is respectively coupled between each output channel, and these a plurality of switches are unlocked according to this controlling signal, share so that these a plurality of output channels are carried out electric charge.
4. LCD as claimed in claim 1, wherein the negative input end of this lag function comparer receives a reference voltage.
5. LCD as claimed in claim 4, wherein this lag function comparer produces a first threshold voltage according to this reference voltage, and during less than this first threshold voltage, exports a low level voltage at this supply voltage.
6. LCD as claimed in claim 4, wherein this lag function comparer produces one second threshold voltage according to this reference voltage, and during greater than this second threshold voltage, exports a high level voltage at this supply voltage.
7. LCD with function of eliminating power-off ghost shadow comprises:
One display panel comprises multi-strip scanning line and many data lines;
One power supply unit is used for exporting a supply voltage;
One gate drivers is coupled to this multi-strip scanning line, comprises one first testing circuit, is used for this supply voltage and a reference voltage are compared, and produces one first controlling signal, and this gate drivers is opened this multi-strip scanning line according to this first controlling signal; And
The one source pole driver, be coupled to this many data lines, comprise one second testing circuit, be used for this supply voltage and this reference voltage are compared, and producing one second controlling signal, this source electrode driver is exported identical image signal in these many data lines according to this second controlling signal.
8. LCD as claimed in claim 7, wherein this source electrode driver also comprises between each output channel that a plurality of switches are respectively coupled to this source electrode driver, and these a plurality of switches are unlocked according to this second controlling signal.
9. LCD as claimed in claim 7, wherein this second testing circuit utilizes a lag function comparer that this supply voltage and this reference voltage are compared.
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| CN200810088413A CN101546536A (en) | 2008-03-26 | 2008-03-26 | Liquid crystal display having function of eliminating power-off ghost shadow |
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| CN200810088413A CN101546536A (en) | 2008-03-26 | 2008-03-26 | Liquid crystal display having function of eliminating power-off ghost shadow |
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| CN102136257A (en) * | 2010-01-22 | 2011-07-27 | 原景科技股份有限公司 | Power-off control circuit adapted in a LCD panel |
| CN102222474A (en) * | 2010-04-14 | 2011-10-19 | 群康科技(深圳)有限公司 | Liquid crystal display device and method for improving power off afterimage phenomenon thereof |
| CN102968975A (en) * | 2012-12-10 | 2013-03-13 | 京东方科技集团股份有限公司 | Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof |
| CN103839531A (en) * | 2014-03-31 | 2014-06-04 | 广州视源电子科技股份有限公司 | Liquid crystal displayer control method and device |
| CN104464673A (en) * | 2014-12-22 | 2015-03-25 | 南京中电熊猫液晶显示科技有限公司 | Display device and control method and control circuit thereof |
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| CN105632435A (en) * | 2016-01-05 | 2016-06-01 | 京东方科技集团股份有限公司 | Residual image circuit for switching on/off and method for removing residual image of switching on/off |
| CN106558289A (en) * | 2015-09-30 | 2017-04-05 | 鸿富锦精密工业（深圳）有限公司 | Liquid crystal indicator and discharge control method |
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| CN102222474A (en) * | 2010-04-14 | 2011-10-19 | 群康科技(深圳)有限公司 | Liquid crystal display device and method for improving power off afterimage phenomenon thereof |
| CN102968975B (en) * | 2012-12-10 | 2015-06-17 | 京东方科技集团股份有限公司 | Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof |
| CN102968975A (en) * | 2012-12-10 | 2013-03-13 | 京东方科技集团股份有限公司 | Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof |
| CN103839531A (en) * | 2014-03-31 | 2014-06-04 | 广州视源电子科技股份有限公司 | Liquid crystal displayer control method and device |
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| CN105632435B (en) * | 2016-01-05 | 2018-06-05 | 京东方科技集团股份有限公司 | Switching on and shutting down image retention eliminates circuit and the method for eliminating switching on and shutting down image retention |
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| CN107103888B (en) * | 2017-05-19 | 2018-09-14 | 深圳市华星光电技术有限公司 | Time sequence driving circuit, driving circuit and the liquid crystal display panel of liquid crystal display panel |
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| CN109545126A (en) * | 2017-09-22 | 2019-03-29 | 深圳市富满电子集团股份有限公司 | Has the LED display controller that ghost eliminates function |
| CN109545126B (en) * | 2017-09-22 | 2024-01-12 | 富满微电子集团股份有限公司 | LED display screen controller with ghost eliminating function |
| CN108172184A (en) * | 2018-01-02 | 2018-06-15 | 京东方科技集团股份有限公司 | Shutdown discharge circuit and display module |
| CN109616069A (en) * | 2019-01-14 | 2019-04-12 | 合肥京东方光电科技有限公司 | Input voltage processing method, device, display base plate and display device |
| CN112086072A (en) * | 2019-06-14 | 2020-12-15 | 联咏科技股份有限公司 | Drive device and method for operating the same |
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| CN110930961A (en) * | 2019-12-17 | 2020-03-27 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit, control method thereof and liquid crystal display device |
| CN110930961B (en) * | 2019-12-17 | 2022-04-12 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit, control method thereof and liquid crystal display device |
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Application publication date: 20090930 |