CN102446499A - Circuit and method for improving image sticking of liquid crystal display device - Google Patents
Circuit and method for improving image sticking of liquid crystal display device Download PDFInfo
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- CN102446499A CN102446499A CN201010514139XA CN201010514139A CN102446499A CN 102446499 A CN102446499 A CN 102446499A CN 201010514139X A CN201010514139X A CN 201010514139XA CN 201010514139 A CN201010514139 A CN 201010514139A CN 102446499 A CN102446499 A CN 102446499A
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Abstract
The invention provides a circuit and method for improving image sticking of liquid crystal display devices. The circuit comprises a two-terminal assembly or a three-terminal assembly, which is connected between an operating voltage and a gate drive starting voltage. The method comprises the following steps: detecting whether the liquid crystal display device is turned off; and when the liquid crystal display device is detected to be turned off, providing the operating voltage to a gate high potential terminal of the grid drive circuit through a voltage converter. The circuit and the method are applicable to liquid crystal display devices to really improve the problem of image sticking which occurs when the liquid crystal display devices are turned off.
Description
[technical field]
The ghost that the present invention relates to a kind of liquid crystal indicator improves circuit and method, particularly relates to a kind of liquid crystal indicator that improves circuit, method and the application thereof of the power-off ghost shadow of liquid crystal indicator.
[background technology]
At present, (Liquid Crystal Display LCD) has been widely used on the various electronic products liquid crystal indicator.Usually; Liquid crystal indicator is to use ghost to improve the ghost phenomena that circuit improves when shutdown; Its principle is to see through ghost in when shutdown with controlling signal (XAO) to improve the grid that circuit forces gate drivers and be output as the grid high levle; Thereby gate drivers can open in the display panels all sweep traces with in the pixel of neutralizer LCD panel residual electric charge, reach the purpose of eliminating the liquid crystal indicator power-off ghost shadow by this.
Yet; When liquid crystal indicator shuts down; When too fast as if the velocity of discharge of the gate driving cut-in voltage (VGH) that offers gate drivers; Then gate drivers can't open smoothly all sweep traces in the display panels come in the pixel of neutralizer LCD panel residual electric charge, thereby can't reach the purpose of eliminating ghost.
[summary of the invention]
Fundamental purpose of the present invention is to provide a kind of ghost of liquid crystal indicator to improve circuit; Said ghost improves circuit and comprises two end assemblies; Wherein two end assemblies have first end points and second end points; First end points is the noble potential end points that is coupled to electric pressure converter, and second end points is the grid noble potential end points that is coupled to gate driver circuit.Wherein, when liquid crystal indicator shut down, two end assemblies were conducting, and electric pressure converter provides operating voltage to grid noble potential end points.
Another object of the present invention is to provide a kind of liquid crystal indicator, said liquid crystal indicator comprises:
Display panels comprises gate driver circuit;
Electric pressure converter is electrically connected at said display panels; And
Ghost improves circuit; Comprise two end assemblies; Wherein said two end assemblies have first end points and second end points, and said first end points is the noble potential end points that is coupled to said electric pressure converter, and said second end points is the grid noble potential end points that is coupled to said gate driver circuit;
Wherein, when said liquid crystal indicator shut down, said two end assemblies were conducting, and said electric pressure converter provides operating voltage to said grid noble potential end points.
Another object of the present invention is to provide a kind of ghost of liquid crystal indicator to improve circuit; Said ghost improves circuit and comprises three end assemblies; Wherein said three end assemblies have first end points, second end points 1 the 3rd end points; Said first end points is the noble potential end points that is coupled to electric pressure converter, and said second end points is the grid noble potential end points that is coupled to gate driver circuit, and said the 3rd end points is in order to receive the conducting control signal;
Wherein, when said liquid crystal indicator shut down, said three end assemblies were to come conducting according to said conducting control signal, and said electric pressure converter provides operating voltage to said grid noble potential end points.
Another object of the present invention is to provide a kind of liquid crystal indicator, said liquid crystal indicator comprises:
Display panels comprises gate driver circuit;
Electric pressure converter is electrically connected at said display panels; And
Ghost improves circuit; Comprise three end assemblies; Wherein said three end assemblies have first end points, second end points and the 3rd end points; Said first end points is the noble potential end points that is coupled to said electric pressure converter, and said second end points is the grid noble potential end points that is coupled to gate driver circuit, and said the 3rd end points is in order to receive the conducting control signal;
Wherein, when said liquid crystal indicator shut down, said three end assemblies were to come conducting according to said conducting control signal, and said electric pressure converter provides operating voltage to said grid noble potential end points.
Another object of the present invention is to provide a kind of method of improving power-off ghost shadow, said method comprises the steps:
Whether the detecting liquid crystal indicator shuts down; And
When detecting said liquid crystal indicator, utilize electric pressure converter that the grid noble potential end points of operating voltage to gate driver circuit is provided for shutdown.
In one embodiment of this invention; Said ghost improves circuit and also comprises voltage detection circuit; Whether in order to detect said liquid crystal indicator is shutdown, and wherein when said liquid crystal indicator was shutdown, said voltage detection circuit sent and controls signal to said gate driver circuit.
In one embodiment of this invention, said two end assemblies are diode or schottky diode.
In one embodiment of this invention, said ghost improves circuit and is built in the said gate driver circuit in being.
In one embodiment of this invention, said conducting control signal is to be formed by said control signal conversion.
In one embodiment of this invention, said ghost improves circuit and also comprises reverse unit, and it is electrically connected between said voltage detection circuit and the said three end assemblies, becomes a conducting control signal in order to change said control signal.
In one embodiment of this invention, said three end assemblies are transistor or field-effect transistor.
The ghost of liquid crystal indicator of the present invention improves circuit and method can be kept the gate driving cut-in voltage when liquid crystal indicator shuts down, positively to improve the power-off ghost shadow problem of liquid crystal indicator.
For letting the foregoing of the present invention can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows:
[description of drawings]
Fig. 1 shows the synoptic diagram according to the liquid crystal indicator of the first embodiment of the present invention;
Fig. 2 shows the synoptic diagram according to the pixel of the display panels of the first embodiment of the present invention;
Fig. 3 shows according to the electric pressure converter of the first embodiment of the present invention and the block schematic diagram that ghost improves circuit;
Fig. 4 shows that the ghost according to the first embodiment of the present invention improves the synoptic diagram of two end assemblies of circuit;
Fig. 5 A shows operating voltage and the oscillogram of gate driving cut-in voltage of available liquid crystal display when shutdown;
Fig. 5 B shows according to the liquid crystal indicator of first embodiment of the present invention operating voltage and the oscillogram of gate driving cut-in voltage when the shutdown;
Fig. 6 shows that the ghost according to another embodiment of the present invention improves the block schematic diagram that is built in the circuit in the gate driver circuit;
Fig. 7 shows according to the method flow diagram that improves the power-off ghost shadow method of the present invention; And
Fig. 8 shows according to the electric pressure converter of the second embodiment of the present invention and the block schematic diagram that ghost improves circuit.
[embodiment]
Below the explanation of each embodiment be with reference to additional graphic, can be in order to illustration the present invention in order to the specific embodiment of implementing.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side ", " interior ", " outward ", " side " etc., only be direction with reference to annexed drawings.Therefore, the direction term of use is in order to explanation and understands the present invention, but not in order to restriction the present invention.
In the drawings, the unit of structural similarity is to represent with same numeral.
Please with reference to Fig. 1, it shows the synoptic diagram according to the liquid crystal indicator of the first embodiment of the present invention.The liquid crystal indicator 100 of present embodiment comprises that display panels 110, backlight module 120, electric pressure converter 130 and ghost improve circuit 140.Display panels 110 is to be provided with respect to backlight module 120, and backlight module 120 is in order to provide display panels 110 1 backlights.Electric pressure converter 130 is to be electrically connected at display panels 110; In order to change the voltage of a power supply (not illustrating); Use a plurality of system voltages (system voltages) that provide display panels 110 required, for example: common voltage Vcom, gate driving cut-in voltage V
GH, gate driving closes voltage V
GLAnd logical operation voltage V
CCIt is to be electrically connected between display panels 110 and the electric pressure converter 130 that ghost improves circuit 140, in order to improve the ghost problem of liquid crystal indicator 100.
As shown in Figure 1, the display panels 110 of present embodiment comprises substrate 111, plurality of pixels 112, some data lines 113, some gate lines 114, data drive circuit 115, gate driver circuit 116 and signal controllers 117.Substrate 111 can for example be glass substrate or pliability plastic base, and in the present embodiment, substrate 111 can for example be thin film transistor (TFT) (Thin Film Transistor; TFT) matrix base plate, and display panels 110 can more comprise liquid crystal layer (not illustrating) and another substrate (not illustrating), this another substrate for example is colored filter (Color Filter; CF) substrate; It is provided with respect to substrate 111, and at this moment, liquid crystal layer is to be formed between TFT matrix base plate (substrate 111) and the CF substrate.So be not limited thereto, in certain embodiments, colored filter and film transistor matrix also configurable on same substrate (that is Color Filter onArray, COA).
As shown in Figure 1; The data line 113 and the gate line 114 of display panels 110 are to be disposed on the substrate 111 interlacedly, and pixel 112 is to be disposed on the substrate 111 with matrix form, and between data line 113 and gate line 114; Data drive circuit 115 is sides that are coupled to data line 113; And be provided with data-driven IC (not illustrating), in order to driving data lines 113, gate driver circuit 116 is sides that are coupled to gate line 114; And be provided with gate driving IC (not illustrating), in order to driving grid line 114.Signal controller 117 is to be electrically connected at data drive circuit 115 and gate driver circuit 116, in order to control data driving circuit 115 and gate driver circuit 116.Signal controller 117 data controlling signal CONT1 can be provided and the image data signal DAT that handled to data drive circuit 115, and provide grid control signal CONT2 to gate driver circuit 116.Data controlling signal CONT1 can comprise for example horizontal enabling signal (STH), load signal (Load), data frequency signal (CLK) and polar signal (POL).Grid control signal CONT2 can comprise for example grid frequency signal (CPV), scan start signal (STV) and output enabling signal (OE).
Please with reference to Fig. 2, it shows the synoptic diagram according to the pixel of the display panels of the first embodiment of the present invention.Each pixel 112 of present embodiment can comprise driving transistors 112a, storage capacitor 112b and liquid crystal cells 112c; The grid of its driving transistors 112a is to be electrically connected to gate line 114; The source electrode of driving transistors 112a is to be electrically connected to data line 113; The drain of driving transistors 112a is an end that is electrically connected to storage capacitor 112b; The other end of storage capacitor 112b is to be coupled to common voltage Vcom, and the end of liquid crystal cells 112c is to be electrically connected at storage capacitor 112b, and the other end of liquid crystal cells 112c is to be electrically connected to common voltage Vcom.
Please with reference to Fig. 2 and Fig. 3, Fig. 3 shows according to the electric pressure converter of the first embodiment of the present invention and the block schematic diagram that ghost improves circuit.The electric pressure converter 130 of present embodiment can comprise boosting unit (Po sitive charge pump) 131 and pressure unit (Negative charge pump) 132.When the liquid crystal indicator 100 of present embodiment during in power on mode, the power supply of liquid crystal indicator 100 can be supplied power to electric pressure converter 130, and at this moment, electric pressure converter 130 can provide operating voltage V
DDATo the gate driver circuit 116 of display panels 110, operating voltage V
DDAComprise a high-potential voltage (V
DD) and a low-potential voltage (VEE), this high-potential voltage V
DDBe preferably a positive voltage, and boosting unit capable of using 131 boosts into gate driving cut-in voltage V
GH, this low-potential voltage VEE is preferably a negative voltage, and pressure unit capable of using 132 comes step-down to become gate driving to close voltage V
GLWhen data drive circuit 115 provided data to pixel 112, gate driver circuit 116 can come conducting driving transistors 112a with voltage VGH via gate line 114.After driving transistors 112a conducting, data drive circuit 115 can provide data in the pixel 112 via data line 113.After data write to pixel 112, at this moment, gate driver circuit 116 was promptly supplied with pixel 112 voltage V
GL, use making pixel 112 be closed condition.And pixel 112 can be stored in data-signal among the storage capacitor 112b, thereby liquid crystal cells 112c does not write (being that driving transistors 112a is switched on once more) sustainable before demonstration as yet in next data.Yet, when liquid crystal indicator 100 gets into shutdown mode,, and be not released out if data-signal (electric charge) still maintains in the storage capacitor 112b, be easy to generate the problem of ghost.
As shown in Figure 3, the ghost of present embodiment improves circuit 140 and comprises voltage detection circuit 141 and two end assemblies 142.Whether voltage detection circuit 141 for low pressure detecting integrated circuit (Low voltage detection IC), is shutdown in order to detecting liquid crystal indicator 100 for example.In the present embodiment, voltage detection circuit 141 can be detected logical operation voltage V
CCWhether or whether other system voltage be lower than a preset value (this preset value can decide according to the actual design demand), shut down to judge liquid crystal indicator 100.As said logical operation voltage V
CCWhen being lower than this preset value, that is when detecting liquid crystal indicator 100 for shutdown, voltage detection circuit 141 can send a control signal (XAO) to gate driver circuit 116, uses to make gate driver circuit 116 according to gate driving cut-in voltage V
GHOpen the driving transistors 112a of all pixels 112, discharging stored image electric charge to the data line 113 of storage capacitor 112b, thereby can reach the effect of the power-off ghost shadow of eliminating liquid crystal indicator 100.
Please with reference to Fig. 3 and Fig. 4, Fig. 4 shows that the ghost according to the first embodiment of the present invention improves the synoptic diagram of two end assemblies of circuit.The two end assemblies 142 that the ghost of present embodiment improves circuit 140 are to be electrically connected at the operating voltage V that electric pressure converter 130 is provided
DDAWith gate driving cut-in voltage V
GHBetween, in order to when liquid crystal indicator 100 shuts down, to keep gate driving cut-in voltage V
GHAccurate position, avoid voltage V
GHIt is too fast when getting into shutdown mode, to discharge, and the situation that can't open driving transistors 112a smoothly.This two ends assembly 142 is preferably the assembly of the characteristic with unidirectional conducting, for example diode.First end points of two end assemblies 142 is the noble potential end points (V that are coupled to electric pressure converter 130
DD), second end points of two end assemblies 142 is grid noble potential end points (that is the gate driving cut-in voltage V that are coupled to gate driver circuit 116
GH).Bright for instance, this two ends assembly 142 can for example be Schottky (Schottky) diode, when liquid crystal indicator 100 is power on mode, that is when electric pressure converter 130 normal power supplies, because voltage V
GHGreater than operating voltage V
DDAVoltage, thereby two end assemblies 142 are reverse bias, and not start.When liquid crystal indicator 100 is shutdown mode, that is when electric pressure converter 130 is not supplied power, gate driving cut-in voltage V
GHBeginning rapid discharge, thereby voltage V
GHLess than operating voltage V
DDAVoltage.At this moment, two end assemblies 142 are forward bias voltage drop, thereby the operating voltage V of electric pressure converter 130
DDACan be provided to the grid hot end of gate driver circuit 116, use making voltage V
GHBut clamp (keeping) is at the operating voltage V of noble potential
DDA
Therefore, when liquid crystal indicator 100 shutdown, gate driving cut-in voltage V
GHStandard position can be kept a Preset Time, the driving transistors 112a that uses all pixels 112 of smooth unlatching discharges electric charge, reaches the effect of the power-off ghost shadow of eliminating liquid crystal indicator 100.
Please with reference to Fig. 5 A and Fig. 5 B; Fig. 5 A shows the operating voltage and the oscillogram of gate driving cut-in voltage of available liquid crystal display when shutdown, and Fig. 5 B shows liquid crystal indicator according to first embodiment of the present invention operating voltage and the oscillogram of gate driving cut-in voltage when shutting down.Wherein, the T of institute's mark in Fig. 5 A and Fig. 5 B
OffBe expressed as the shutdown sequential of LCD, shown in Fig. 5 A, when the available liquid crystal display shuts down, gate driving cut-in voltage V
GHCan be discharged to 0V rapidly, thereby turn-on transistor is eliminated power-off ghost shadow smoothly.Otherwise, shown in Fig. 5 B, when the liquid crystal indicator 100 of present embodiment shuts down, gate driving cut-in voltage V
GHStandard position can be by operating voltage V via 142 conductings of two end assemblies
DDAKeep, to avoid voltage V
GHDischarge too fast and problem can't turn-on transistor 112a, thereby the ghost of present embodiment improve circuit 140 and can improve liquid crystal indicator 100 contingent ghost problem when shutdown significantly.
It should be noted that when the liquid crystal indicator 100 of present embodiment shuts down, if gate driving cut-in voltage V
GHThe velocity of discharge slower, the effect of then eliminating power-off ghost shadow can be better.Therefore, compared to other voltage, the operating voltage V that electric pressure converter 130 is provided
DDACan keep gate driving cut-in voltage V
GHthe long time of accurate position, and can obtain preferable elimination power-off ghost shadow effect.With common voltage Vcom is example, because the operating voltage V that electric pressure converter 130 is provided
DDAGreater than common voltage Vcom, and operating voltage V
DDAHave identical path with the total system input voltage, and have bigger resistance capacitance value (RC value), in the design of circuit, operating voltage V
DDACapacitance can be greater than more than the common voltage Vcom several times.Moreover, because operating voltage V
DDAGreater than common voltage Vcom (operating voltage V
DDABe about two times of common voltage Vcom), so at shutdown gate driving cut-in voltage V during moment
GHCan begin to reduce, as gate driving cut-in voltage V
GHBe reduced to operating voltage V
DDAAccurate position the time, gate driving cut-in voltage V
GHThen can be by operating voltage V
DDABolt-lock is lived (latch).Otherwise, if use the mode of common voltage Vcom, then gate driving cut-in voltage V
GHJust can be lived in the time of then need dropping to the accurate position of common voltage Vcom by bolt-lock.Therefore, compared to common voltage Vcom, the operating voltage V that the electric pressure converter 130 of present embodiment is provided
DDACan when shutdown, have bolt-lock speed and bolt-lock time more of a specified duration faster.With guarantee all gate lines 114 in the display panels 110 all can be come by smooth unlatching in pixel 112 in residual electric charge, thereby can have preferable elimination power-off ghost shadow effect.
In the present embodiment; The signal controller 117 of display panels 110, electric pressure converter 130 and ghost improve circuit 140 and can be arranged on the control panel (not illustrating); This control panel for example is printed circuit board (PCB) (Printed circuit board; PCB) or flexible printed wiring board (Flexible Printed Circuits, FPC).
In another embodiment, ghost improves circuit 140 and also can be arranged on the substrate 111, at this moment, and gate driver circuit 116 GIP capable of using (Gate-In-Panel) technology, or claim gale-less technology, come directly to be formed on the substrate 111.
Please with reference to Fig. 6, it shows that the ghost according to another embodiment of the present invention improves the block schematic diagram that is built in the circuit in the gate driver circuit.In another embodiment, ghost improves circuit 240 and can be integrated in the one chip, for example is built in the gate driver circuit 216 in directly.
Please with reference to Fig. 7, it shows according to the method flow diagram that improves the power-off ghost shadow method of the present invention.When carry out present embodiment improve the method for power-off ghost shadow the time, at first, the voltage detection circuit 141 that utilizes ghost to improve circuit 140 is detected liquid crystal indicator 100 whether shut down (step S301).Then, when voltage detection circuit 141 detected liquid crystal indicator 100 for shutdown, voltage detection circuit 141 can send control signal (XAO) to gate driver circuit 116, uses to make gate driver circuit 116 according to gate driving cut-in voltage V
GHOpen the driving transistors 112a of all pixels 112, and electric pressure converter can provide operating voltage V
DDAGrid noble potential end points V to gate driver circuit 116
GH(step S302) uses and keeps gate driving cut-in voltage V
GHAccurate position one Preset Time, thereby can guarantee that the driving transistors 112a of all pixels 112 of display panels 110 is unlocked, and reach the effect of eliminating power-off ghost shadow.
Please with reference to Fig. 8, it shows according to the electric pressure converter of the second embodiment of the present invention and the block schematic diagram that ghost improves circuit.Compared to first embodiment, the ghost of second embodiment improves circuit 440 and comprises voltage detection circuit 441 and three end assemblies 442.Whether voltage detection circuit 441 can be detected liquid crystal indicator 100 and shut down; When voltage detection circuit 441 detects liquid crystal indicator 100 shutdown; Voltage detection circuit 441 can send control signal (XAO) to gate driver circuit 116, eliminates the power-off ghost shadow of liquid crystal indicator 100.Three end assemblies 442 are to be electrically connected at the operating voltage V that electric pressure converter 130 is provided
DDAWith gate driving cut-in voltage V
GHBetween, this three ends assembly 442 for example is a transistor, first end points of three end assemblies 442 is the noble potential end points (V that are coupled to electric pressure converter 130
DD), second end points of three end assemblies 442 is grid noble potential end points (that is the gate driving cut-in voltage V that are coupled to gate driver circuit 116
GH); The 3rd end points of three end assemblies 442 is in order to receive a conducting control signal 401; The control signal of these conducting control signal 401 voltage detection circuits 441 capable of using is come through a reverse unit 443 and conversion forms; Wherein reverse unit 443 is to be electrically connected between voltage detection circuit 441 and the three end assemblies 442, becomes the conducting control signal 401 of the accurate position of high voltage in order to the control signal of changing voltage circuit for detecting 441.Bright for instance, this three ends assembly 442 can for example be a field-effect transistor, and its drain (first end points) is coupled to noble potential end points (V
DD), its source electrode (second end points) is coupled to grid noble potential end points (V
GH), with and grid (the 3rd end points) be coupled to reverse unit 443.When liquid crystal indicator 100 was power on mode, three end assemblies 442 were not conducting.When liquid crystal indicator 100 was shutdown mode, the grid of three end assemblies 442 (the 3rd end points) can receive the conducting control signal 401 of high levle, thereby the 442 formation conductings of three end assemblies, and using provides the operating voltage of electric pressure converter 130 V
DDAGrid hot end (V to gate driver circuit 116
GH).Therefore, as gate driving cut-in voltage V
GHStandard position can be kept a Preset Time, use the power-off ghost shadow of eliminating liquid crystal indicator 100.
Embodiment by the invention described above can know; The gate driving cut-in voltage discharge that the ghost of liquid crystal indicator of the present invention improves circuit and method can avoid the liquid crystal indicator shutdown time is too fast; And the driving transistors of guaranteeing all pixels can be used and improve liquid crystal indicator contingent ghost problem when shutdown by smooth unlatching.
In sum; Though the present invention discloses as above with preferred embodiment; But above-mentioned preferred embodiment is not that those of ordinary skill in the art is not breaking away from the spirit and scope of the present invention in order to restriction the present invention; All can do various changes and retouching, so protection scope of the present invention is as the criterion with the scope that claim defines.
Claims (10)
1. the ghost of a liquid crystal indicator improves circuit; It is characterized in that: said ghost improves circuit and comprises two end assemblies; Wherein said two end assemblies have first end points and second end points; Said first end points is the noble potential end points that is coupled to electric pressure converter, and said second end points is the grid noble potential end points that is coupled to gate driver circuit;
Wherein, when said liquid crystal indicator shut down, said two end assemblies were conducting, and said electric pressure converter provides operating voltage to said grid noble potential end points.
2. ghost according to claim 1 improves circuit, it is characterized in that: also comprise:
Whether voltage detection circuit is shutdown in order to detect said liquid crystal indicator, and wherein when said liquid crystal indicator was shutdown, said voltage detection circuit sent and controls signal to said gate driver circuit.
3. ghost according to claim 1 improves circuit, it is characterized in that: said two end assemblies are diode or schottky diode.
4. ghost according to claim 1 improves circuit, it is characterized in that: said ghost improves circuit and is built in the said gate driver circuit in being.
5. liquid crystal indicator, it is characterized in that: said liquid crystal indicator comprises:
Display panels comprises gate driver circuit;
Electric pressure converter is electrically connected at said display panels; And
Ghost improves circuit; Comprise two end assemblies; Wherein said two end assemblies have first end points and second end points, and said first end points is the noble potential end points that is coupled to said electric pressure converter, and said second end points is the grid noble potential end points that is coupled to said gate driver circuit;
Wherein, when said liquid crystal indicator shut down, said two end assemblies were conducting, and said electric pressure converter provides operating voltage to said grid noble potential end points.
6. the ghost of a liquid crystal indicator improves circuit; It is characterized in that: said ghost improves circuit and comprises three end assemblies; Wherein said three end assemblies have first end points, second end points and the 3rd end points; Said first end points is the noble potential end points that is coupled to electric pressure converter, and said second end points is the grid noble potential end points that is coupled to gate driver circuit, and said the 3rd end points is in order to receive the conducting control signal;
Wherein, when said liquid crystal indicator shut down, said three end assemblies were to come conducting according to said conducting control signal, and said electric pressure converter provides operating voltage to said grid noble potential end points.
7. ghost according to claim 6 improves circuit; It is characterized in that: said ghost improves circuit and also comprises reverse unit; It is electrically connected between said voltage detection circuit and the said three end assemblies, becomes a conducting control signal in order to change said control signal.
8. ghost according to claim 6 improves circuit, it is characterized in that: said three end assemblies are transistor or field-effect transistor.
9. liquid crystal indicator, it is characterized in that: said liquid crystal indicator comprises:
Display panels comprises gate driver circuit;
Electric pressure converter is electrically connected at said display panels; And
Ghost improves circuit; Comprise three end assemblies; Wherein said three end assemblies have first end points, second end points and the 3rd end points; Said first end points is the noble potential end points that is coupled to said electric pressure converter, and said second end points is the grid noble potential end points that is coupled to gate driver circuit, and said the 3rd end points is in order to receive the conducting control signal;
Wherein, when said liquid crystal indicator shut down, said three end assemblies were to come conducting according to said conducting control signal, and said electric pressure converter provides operating voltage to said grid noble potential end points.
10. method of improving power-off ghost shadow, it is characterized in that: said method comprises the steps:
Whether the detecting liquid crystal indicator shuts down; And
When detecting said liquid crystal indicator, utilize electric pressure converter that the grid noble potential end points of operating voltage to gate driver circuit is provided for shutdown.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010514139XA CN102446499A (en) | 2010-10-08 | 2010-10-08 | Circuit and method for improving image sticking of liquid crystal display device |
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|---|---|---|---|
| CN201010514139XA CN102446499A (en) | 2010-10-08 | 2010-10-08 | Circuit and method for improving image sticking of liquid crystal display device |
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| CN102446499A true CN102446499A (en) | 2012-05-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107644609A (en) * | 2017-10-11 | 2018-01-30 | 京东方科技集团股份有限公司 | The circuit and driving method, gate driving circuit of GOA signal end signal amplitudes during lifting shutdown |
| CN110070816A (en) * | 2019-04-04 | 2019-07-30 | 深圳市华星光电技术有限公司 | Display panel, drive circuit |
| 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 |
| CN110599977A (en) * | 2019-09-18 | 2019-12-20 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit and display device |
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| CN101320171A (en) * | 2007-06-08 | 2008-12-10 | 群康科技(深圳)有限公司 | LCD and method for improving power-off ghost |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101320171A (en) * | 2007-06-08 | 2008-12-10 | 群康科技(深圳)有限公司 | LCD and method for improving power-off ghost |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN107644609A (en) * | 2017-10-11 | 2018-01-30 | 京东方科技集团股份有限公司 | The circuit and driving method, gate driving circuit of GOA signal end signal amplitudes during lifting shutdown |
| 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 |
| CN110070816A (en) * | 2019-04-04 | 2019-07-30 | 深圳市华星光电技术有限公司 | Display panel, drive circuit |
| WO2020199302A1 (en) * | 2019-04-04 | 2020-10-08 | 深圳市华星光电技术有限公司 | Display panel driving circuit and method |
| CN110599977A (en) * | 2019-09-18 | 2019-12-20 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit and display device |
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Application publication date: 20120509 |