CN104616632A - Liquid crystal display driving circuit capable of preventing de-energization shadow and driving method thereof - Google Patents
Liquid crystal display driving circuit capable of preventing de-energization shadow and driving method thereof Download PDFInfo
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Abstract
The invention discloses a liquid crystal display driving circuit capable of preventing de-energization shadow and a driving method thereof. The driving circuit comprises a source circuit used for outputting first voltage to a plurality of pixel electrodes, a common voltage circuit used for outputting second voltage to a common electrode and a switching circuit. When a system is de-energized to a threshold, the output of the source circuit and the output of the common voltage circuit are coupled together through the effect of a switching circuit to conduct discharging synchronously. When the system is de-energized to a threshold, the output of the source circuit and the output of the common voltage circuit are coupled together to conduct discharging synchronously, so that the voltage difference between the pixel electrode and a public electrode, and de-energization shadow is avoided. In addition, only the output of the source electrode and the public voltage circuit is connected, the original source electrode and the public voltage circuit are not required to be modified greatly, and the achievement is simple.
Description
Technical field
The present invention relates to a kind of liquid crystal display drive circuit and driving method, particularly relate to a kind of liquid crystal display drive circuit and the driving method that effectively can prevent lower electric ghost.
Background technology
Liquid crystal display because it is frivolous, penetrate without width, low power consumption, long service life, picture is soft does not hinder the characteristics such as eye, uses occupation rate quite high in each application.Wherein with the tft type liquid crystal display (TFT-LCD) of active matric-type for the main flow on market.
General TFT-LCD mainly comprises display panel and display driver circuit.The schematic diagram of display panel as shown in Figure 1, in whole display panels 1 framework, has the pixel 11 of multiple arrangement in matrix.The circuit diagram of single sub-pixel (sub-pixel) as shown in Figure 2, the grid level G of transistor (TFT) Q provides control signal by gate driver circuit, source S provides the data-signal of display by source circuit, and drain D connects show electrode.Gate driver circuit controls the closed of transistor Q according to providing the height of voltage level and turns off.When grid G voltage is high level, transistor Q closes, and source circuit is sent to show electrode to the data-signal of the display that source S provides.Between show electrode and common electrode, electric capacity is parasitic liquid crystal capacitance Clc and memory capacitance Cs.Liquid crystal display content is determined by the pressure reduction between show electrode and common electrode.
A base pixel (pixel), needs three sub-pixel (sub-pixel) compositions, represents RGB three primary colors respectively.The waveform of its principle of work for being sent by gate driver circuit, successively the TFT of every a line is opened, the source S end that source circuit will need the data of display to deliver to the TFT of this journey, will represent that the voltage transmission of data is to show electrode by TFT, and shows different gray scales.After this journey is charged, gate driver circuit stops providing voltage to this journey, provides voltage, then carry out discharge and recharge by source circuit to the show electrode of next line by the gate driver circuit of next line to next line.So sequentially go down, when the pixel of last column of substituting the bad for the good, a frame picture has shown completely.
In the liquid crystal panel module of TV or display, the grid G end of TFT is driven by gate driver circuit, and source S end is driven by source circuit 31, and common-battery extremely then provides voltage by common electric voltage circuit 32.After under system, electricity order sends, system power supply starts to ground electric discharge, and now source circuit 31 is electric under being checked through supply voltage, and the switch of all output terminals closes and connects together and discharges over the ground, as shown in Figure 3A.Common voltage circuit 32 is discharged by inside, as shown in Figure 3 B.But due to the difference that source circuit 31 and common voltage circuit 32 are arranged, the fall off rate that the output fall off rate of source circuit 31 exports with common voltage circuit 32 is inconsistent, there is certain pressure reduction between it, result between pixel electrode and common electrode and there is pressure reduction, waveform as shown in Figure 4.The phenomenon then seen on liquid crystal panel is: after lower electricity order, Display panel is light again after black picture, finally secretly going down or secretly going down after flower screen again slowly, and this phenomenon is referred to as ghost.
Summary of the invention
For prior art Problems existing, an object of the present invention is to provide one not need significantly to revise existing driving circuit, be convenient to realize, and effectively can prevent the liquid crystal display drive circuit of lower electric ghost.
Another object of the present invention is to provide a kind of method for driving liquid crystal display that effectively can prevent lower electric ghost.
For achieving the above object, the liquid crystal display drive circuit preventing lower electric ghost of the present invention, comprising:
Source circuit, for exporting one first voltage to multiple pixel electrode;
Common voltage circuit, for exporting one second voltage to common electrode; And
Commutation circuit;
Wherein, when under system, electricity is to a threshold value, by the effect of described commutation circuit, together with the output of described source circuit is coupled to the output of described common voltage circuit.
Further, together with the output of described source circuit to be coupled to the output of described common voltage circuit via one first resistive element.
Further, described source circuit comprises multiple first impact damper, and described first voltage one of to be exported in described multiple pixel electrode by one first path by each described first impact damper; When under system, electricity is to described threshold value, by the control of described commutation circuit, together with the output of described source circuit to be coupled to the output of described common voltage circuit via one first resistive element by one second path by each first impact damper.
Further, described source electrode drive circuit comprises multiple first impact damper, and the output terminal correspondence of each described first impact damper one of to couple in described multiple pixel electrode; Described commutation circuit comprises multiple on-off element, the first end correspondence of described multiple on-off element is coupled to the output terminal of described multiple first impact damper, and the second end of described multiple on-off element is all coupled by the output of described first resistive element and described common voltage circuit; When under system, electricity is to described threshold value, described multiple on-off element is all closed to form described second path, together with being coupled to the output of described common voltage circuit via described first resistive element by the output terminal of described multiple first impact damper.
Further, described common voltage circuit comprises one second impact damper, the output terminal of described multiple first impact damper is coupled to the first end of described first resistive element, the output terminal of described second impact damper is coupled to the second end of described first resistive element, together with the output of described source circuit being coupled to the output of described common voltage circuit.
Further, described liquid crystal display drive circuit also comprises:
Power circuit, for providing voltage to described source circuit and described common voltage circuit;
Testing circuit, during for voltage drop to predetermined voltage that described power circuit provides being detected, under judging described system, electricity is to described threshold value, and send the first control signal to described commutation circuit, together with the output of described source circuit being coupled to the output of described common voltage circuit via one first resistive element.
Further, described testing circuit, time also for detecting that voltage drop that described power circuit provides is to described predetermined voltage, sends the second control signal to described multiple first impact damper and described second impact damper.
Further, when described testing circuit detects that voltage drop that described power circuit provides is to described predetermined voltage, send described second control signal to described multiple first impact damper of described source circuit and described second impact damper of described common voltage circuit and turn off described first impact damper and described second impact damper, and send described first control signal to described multiple on-off element of described commutation circuit and close described multiple on-off element, make the output short circuit of described multiple first impact damper, output terminal again via described first resistive element and described second impact damper couples.
Further, also couple the first end of the second resistive element between described second end of described multiple on-off element and the described first end of described first resistive element, the second end of described second resistive element controls and ground terminal via the first on-off element; When voltage drop that described power circuit provides being detected to described predetermined voltage, described testing circuit sends the 3rd control signal to described first on-off element and closes described first on-off element, to discharge via the branch road at described second resistive element place simultaneously.
Further, described source circuit and described commutation circuit are arranged on the first chip, and described common voltage circuit is arranged on the second chip, and described first chip and described second chip are separate chip.
Further, described first resistive element is arranged in described first chip.
Further, described first resistive element is arranged on the pcb board outside described first chip and described second chip.
Further, described source circuit, described commutation circuit and described common voltage circuit are integrated on same 3rd chip.
Further, described first resistive element is integrated in described 3rd chip.
The liquid crystal display drive circuit preventing lower electric ghost of the present invention, comprising:
Source circuit, for exporting one first voltage to multiple pixel electrode;
Common voltage circuit, for exporting one second voltage to common electrode; And
Commutation circuit;
Wherein, when under system, electricity is to a threshold value, by the effect of described commutation circuit, the output of described source circuit is coupled to earth terminal via one the 3rd resistive element, the output of described common voltage circuit is coupled to earth terminal via one the 4th resistive element, and the resistance of described 3rd resistive element and described 4th resistive element configures with predetermined ratio, to make the output of described source circuit consistent with the output discharge rate of described common voltage circuit.
Further, described commutation circuit comprises the 3rd on-off element and the 4th on-off element, and described 3rd on-off element is coupled between described 3rd resistive element and described earth terminal, and described 4th on-off element is coupled between described 4th resistive element and described earth terminal.
Further, described source circuit and described common voltage circuit are integrated on same 3rd chip; Described source electrode drive circuit comprises multiple first impact damper, and described common voltage circuit comprises one second impact damper; Described first voltage one of to be exported in described multiple pixel electrode by one first path by each described first impact damper; When under system, electricity is to described threshold value, by the effect of described commutation circuit, the output terminal of each first impact damper is coupled to earth terminal by described 3rd resistive element, and the output terminal of described second impact damper is coupled to earth terminal by described 4th resistive element.
The method for driving liquid crystal display preventing lower electric ghost of the present invention, for comprising the driving of the liquid crystal display circuit of source circuit and common voltage circuit, described source circuit is used for exporting one first voltage to multiple pixel electrode, described common voltage circuit, for exporting one second voltage to common electrode, it is characterized in that, comprise the steps:
The whether lower electricity of detection system is to a threshold value;
When electricity being detected under system to described threshold value, by the effect of commutation circuit, the output of the output of source circuit potential circuit is together coupled to together.
Further, described source circuit comprises multiple first impact damper, and the first voltage one of to be exported in described multiple pixel electrode by one first path by each described first impact damper; When electricity being detected under system to described threshold value, by the effect of described commutation circuit, together with the output of described source circuit to be coupled to the output of described common voltage circuit via one first resistive element by one second path by each first impact damper.
Further, described source electrode drive circuit comprises multiple first impact damper, and the output terminal correspondence of each described first impact damper one of to couple in described multiple pixel electrode; Described commutation circuit comprises multiple on-off element, the first end correspondence of described multiple on-off element is coupled to the output terminal of described multiple first impact damper, and the second end of described multiple on-off element is all coupled by the output of one first resistive element and described common voltage circuit; When electricity being detected under system to described threshold value, described multiple on-off element is all closed to form described second path, together with being coupled to the output of described common voltage circuit via one first resistive element by the output terminal of described multiple first impact damper.
Further, described common voltage circuit comprises one second impact damper, the output terminal of described multiple first impact damper is coupled to the first end of described first resistive element, the output terminal of described second impact damper is coupled to the second end of described first resistive element, together with the output of described source circuit being coupled to the output of described common voltage circuit.
Further, the whether lower electricity of described detection system comprises the steps: to a threshold value
Detect the voltage that power circuit provides;
The voltage provided by power circuit compares with a predetermined voltage;
Judge that the whether lower electricity of system is to described threshold value according to comparative result.
Further, described driving method also comprises when electricity being detected under system to described threshold value, sends the first control signal to described commutation circuit, together with the output of described source circuit being coupled to the output of described common voltage circuit via one first resistive element.
Further, described driving method also comprises when detecting that under system, electricity is to described threshold value, send the second control signal to multiple first impact damper of described source circuit and the second impact damper of described common electric voltage circuit and turn off described first impact damper and described second impact damper, and send described first control signal to multiple on-off elements of described commutation circuit and close described multiple on-off element, make the output short circuit of described multiple first impact damper, then couple via the output of described first resistive element and described second impact damper.
Further, also couple the first end of the second resistive element between described second end of described multiple on-off element and the described first end of described first resistive element, the second end of described second resistive element controls and ground terminal via the first on-off element; When detecting that under system, electricity is to described threshold value, sending the 3rd control signal to described first on-off element and closing described first on-off element, to discharge via the branch road at described second resistive element place simultaneously.
The output of the output of source circuit and common electric voltage circuit couples to during a threshold value by the present invention's electricity under system, so can synchronously discharge, and then guarantee that between the pixel electrode of display panel after lower electricity and public electrode, pressure reduction is zero, avoid lower electric ghost problem.In addition, because this programme is only the output of the output of source circuit and common electric voltage circuit linked together, and significantly revising without the need to making original source circuit and common electric voltage circuit, implementing more easy.
Accompanying drawing explanation
Fig. 1 is the structural representation of display panels;
Fig. 2 is the circuit diagram of single sub-pixel in display panels;
Fig. 3 A be existing when lower electricity the electric discharge schematic diagram of source circuit in liquid crystal display drive circuit;
Fig. 3 B be existing when lower electricity the electric discharge schematic diagram of common voltage circuit in liquid crystal display drive circuit;
Fig. 4 is the waveform schematic diagram that lower electric ghost phenomena occurs;
Fig. 5 is the schematic diagram of the liquid crystal display drive circuit of one embodiment of the invention;
Fig. 6 is the structural representation of source circuit in liquid crystal display drive circuit;
Fig. 7-Fig. 8 is the structural representation that in the liquid crystal display drive circuit of one embodiment of the invention, source circuit and common voltage circuit are integrated in two individual chips respectively;
Fig. 9-Figure 11 is the structural representation that in the liquid crystal display drive circuit of one embodiment of the invention, source circuit and common voltage circuit are integrated in same chip;
Figure 12 is the discharge waveform schematic diagram of liquid crystal display drive circuit of the present invention.
Embodiment
Further can understand below the present invention for making those skilled in the art and enumerate preferred embodiment of the present invention, and coordinate appended accompanying drawing, describe constitution content of the present invention in detail.For convenience of description, each accompanying drawing of the present invention is only signal to be easier to understand the present invention, and its detailed ratio can adjust according to the demand of design.
As shown in Figure 5, the liquid crystal display drive circuit 3 preventing lower electric ghost of the present invention, comprising:
Source circuit 31, exports gray scale voltage, i.e. the first voltage for the multiple pixel electrodes to display panel;
Common voltage circuit 32, for the common electrode outputting common voltage to display panel, i.e. the second voltage; And
Commutation circuit 33;
Wherein, when electricity is to a threshold value under system, by the effect of described commutation circuit 33, together with the output of described source circuit being coupled to the output of described common voltage circuit, with synchronous discharge, and then the pressure reduction between described pixel electrode and described common electrode is made to be 0.
The present embodiment is by the control of commutation circuit, the output of the output of source circuit potential circuit is together made to be coupled to together, thus source electrode drive circuit potential circuit synchronous discharge with electricity under system together can be made, make the two discharge rate basically identical, and that cause lower electric ghost problem inconsistent due to pressure reduction between pixel electrode and common electrode can be avoided.
In above-described embodiment, source circuit 31 can comprise multiple source electrode impact damper (Source buffer), i.e. the first impact damper 311.Gray scale voltage one of to be exported in described multiple pixel electrode by the first path D1 by each first impact damper 311; When under system, electricity is to a threshold value, by the control of commutation circuit 33, the output of the output of source circuit 31 via the first resistive element R potential circuit 32 is together coupled to together by one second path D2 by each first impact damper 311.Wherein, the quantity of the first impact damper 311 is determined by the number of the pixel of a line.
In one embodiment of this invention, output terminals A 1 correspondence of each first impact damper 311 one of to couple in described multiple pixel electrode; Commutation circuit 33 comprises multiple on-off element M2, the first end correspondence of multiple on-off element M2 is coupled to the output terminals A 1 of multiple first impact damper 311, and second end of multiple on-off element M2 is all coupled to together by the output of one first resistive element R potential circuit 32 together; When under system, electricity is to a threshold value, multiple on-off element M2 is all closed to form the second path D2, the output of the output terminals A 1 of described multiple first impact damper 311 via one first resistive element R potential circuit 32 is together coupled to together.
The present embodiment compares an embodiment, to the composition structure of commutation circuit 33 and and the annexation of other circuit done concrete restriction, but the composition of commutation circuit and annexation are not limited with this embodiment, every when lower electricity can by the output of source circuit 31 together potential circuit 32 be coupled to any commutation circuit structure together, or commutation circuit connected mode can be used.In addition, the type of the present embodiment breaker in middle element M2 is generally electronic switch, such as thyristor (SCR) etc.
As shown in Figure 6, the structural representation of source circuit 31 is shown.Source circuit 31, except comprising multiple first impact damper 311, also comprises serioparallel exchange unit (Serial To Parallel Convertor), Latch unit, DAC unit.Wherein, the basic functional principle of source electrode drive circuit: source electrode drive circuit receives HSSI High-Speed Serial Interface data and the clock signal of timing control unit transmission, and by serioparallel exchange unit, serial data is converted to parallel data.Parallel data is sent to by Latch circuit in the DAC of respective respective channel by SR signal that shift register (not shown) exports successively, the Gamma reference voltage VGM<N> that this data selection Gammabuffer exports, output to the input end of the first impact damper 311, by the first impact damper 311, this voltage (gray scale voltage) is driven into the source electrode of TFT.
In above-described embodiment, common voltage circuit 32 can comprise common voltage impact damper (VCOM buffer), i.e. the second impact damper 321, the output terminals A 1 of multiple first impact damper 311 is coupled to the first end of the first resistive element R, the output terminal of the second impact damper 321 is coupled to second end of the first resistive element R, is connected to earth terminal via an electric capacity of voltage regulation C1 simultaneously.
In one embodiment of this invention, liquid crystal display drive circuit 3 also comprises:
Power circuit (not shown), for providing voltage to source circuit 31 and common voltage circuit 32;
Testing circuit 34, during for detecting that the voltage that described power circuit provides is down to a predetermined voltage, under decision-making system, electricity is to described threshold value, and send the first control signal S1 to commutation circuit 33, the output of the output of source circuit 31 via one first resistive element R potential circuit 32 is together coupled to together and is connected to earth terminal.In liquid crystal display drive circuit, increase the testing circuit 34 of the whether lower electricity of detection system in the present embodiment in addition, accurately can also be controlled the switch motion of commutation circuit 33 simultaneously by testing circuit 34.In the present embodiment testing circuit 34 detection system whether lower electricity to threshold value be that the voltage that provides according to power circuit and a predetermined voltage comparative result judge, right the present invention is not as limit, and the whether lower electricity of testing circuit 34 detection system also can judge according to the comparative result of the fall off rate of power circuit voltage and a predetermined voltage fall off rate to a threshold value.
In another embodiment, testing circuit 34, time also for detecting that the voltage that described power circuit provides is down to predetermined voltage, the second control signal S2 is sent to turn off the first impact damper 311 and the second impact damper 321 to multiple first impact damper 311 and the second impact damper 321, make it export and be in high-impedance state, and send described first control signal S1 to multiple on-off element M2 of commutation circuit 33 and close multiple on-off element M2, make output terminals A 1 short circuit of multiple first impact damper 311, then couple via the output of the first resistive element R and the second impact damper 321.In the present embodiment, when the voltage detecting that described power circuit provides is down to predetermined voltage, testing circuit 34 can send both the second control signal S2 control to the first impact damper 311 and the second impact damper 321 and be in high-impedance state, sends the first control signal S1 to make multiple on-off element M2 all closed to on-off element M2 simultaneously.But the present invention, not as limit, selectively only sends the first signal to on-off element M2 when the voltage detecting that described power circuit provides is down to predetermined voltage, and does not send the second control signal to the first impact damper and the second impact damper.Wherein, the first control signal S1 and the second control signal S2 belongs to the same class signal that testing circuit 34 is sent to different elements, and the first control signal S1 and the second control signal S2 is interpreted as same signal at this, but the present embodiment is not as limit.
In one embodiment of this invention, also couple the first end of the second resistive element R1 between second end of multiple on-off element M2 and the first end of the first resistive element R, second end of the second resistive element R1 controls and ground terminal via the first on-off element M1; When the voltage detecting that described power circuit provides is down to predetermined voltage, testing circuit 34 sends the closed first on-off element M1 of the 3rd control signal S3, to discharge via the branch road at the second resistive element R1 place simultaneously to the first on-off element M1.The present embodiment adds a discharge paths in addition in liquid crystal display drive circuit, can accelerate the velocity of discharge of source circuit and common voltage circuit thus.
In one embodiment of this invention, as shown in Figure 7, commutation circuit 33 and source circuit 31 are integrated on the first chip 41, and common voltage circuit 32 is arranged on the second chip 42, and the first chip 41 and the second chip 42 are separate chip.In addition, the first resistive element R also can be integrated in the first chip 41 simultaneously.As shown in Figure 8, the first resistive element R can also optionally be arranged in the pcb board (not shown) outside the first chip 41 and the second chip 42.
In another embodiment of the invention, as shown in Figure 9, source circuit 31, common voltage circuit 32 and commutation circuit 33 are integrated on same 3rd chip 43.In addition, the first resistive element R is integrated in the 3rd chip 43.
In one embodiment of this invention, as shown in Figure 10, the second resistive element R1 is also integrated in the 3rd chip 43 by it compared with Fig. 9.
In one embodiment of this invention, as shown in figure 11, source circuit 31 and common voltage circuit 32 are integrated on same 3rd chip 43; Described source electrode drive circuit 31 comprises multiple first impact damper 311, and described common voltage circuit 32 comprises one second impact damper 321; Gray scale voltage one of to be exported in described multiple pixel electrode by one first path by each described first impact damper 311; When detecting that under system, electricity is to described threshold value, by the control of described commutation circuit 33, each first impact damper 311 is coupled to earth terminal by one the 3rd resistive element R1, described second impact damper 321 is coupled to earth terminal by one the 4th resistive element R2, and described 3rd resistive element R1 and described 4th resistive element R2 configures with predetermined ratio.The present embodiment is configured with predetermined ratio by the 3rd resistive element R1 and the 4th resistive element R2, can regard as and indirectly make the output of the output of source circuit and common voltage circuit couple, to make the output of described source circuit 31 consistent with the output discharge rate of described common voltage circuit 32.
By specific embodiment, liquid crystal display drive circuit of the present invention is described in detail above.Referring to the liquid crystal display drive circuit of above-described embodiment, its method for driving liquid crystal display is described further.
Method for driving liquid crystal display of the present invention comprises the steps:
The whether lower electricity of detection system is to a threshold value;
When electricity being detected under system to described threshold value, by the control of commutation circuit 33, the output of the output of source circuit 31 potential circuit 32 is together coupled, with synchronous discharge, and then make pixel electrode together interelectrode pressure reduction be 0.
Wherein, the whether lower electricity of described detection system comprises the steps: to a threshold value
Detect the voltage that power circuit provides;
The voltage provided by power circuit compares with a predetermined voltage;
Judge that the whether lower electricity of system is to described threshold value according to comparative result.
The whether lower electricity of detection system of the present invention is not limited to above-described embodiment to the step of a threshold value, and it also can be:
Detect the voltage decreasing rate that power circuit provides;
The voltage decreasing rate provided by power circuit compares with a predetermined voltage fall off rate;
Judge that the whether lower electricity of system is to described threshold value according to comparative result.
In one embodiment of this invention, described driving method also comprises when detecting that under system, electricity is to described threshold value, send the first control signal to commutation circuit 33, the output of the output of source circuit 31 via one first resistive element R potential circuit 32 is together coupled together.
In one embodiment of this invention, described driving method also comprises when detecting that under system, electricity is to described threshold value, send the second control signal to multiple first impact damper of described source circuit and the second impact damper of described common electric voltage circuit and turn off described first impact damper and described second impact damper, and send described first control signal to multiple on-off elements of described commutation circuit and close described multiple on-off element, make the output short circuit of described multiple first impact damper, then couple via the output of described first resistive element and described second impact damper.
In another embodiment of the invention, when detecting that under system, electricity is to described threshold value, testing circuit 34 sends the closed first on-off element M1 of the 3rd control signal to the first on-off element M1, to discharge via the branch road at the second resistive element R1 place, to accelerate the velocity of discharge of source circuit and common voltage circuit simultaneously.
The output of the output of source circuit and common electric voltage circuit couples to during a threshold value by the present invention's electricity under system, so can synchronously discharge, and then guarantee that between the pixel electrode of display panel after lower electricity and public electrode, pressure reduction is zero, electric discharge schematic diagram as shown in figure 12, avoids lower electric ghost problem.In addition, because this programme is only the output of the output of source circuit and common electric voltage circuit linked together, and significantly revising without the need to making original source circuit and common electric voltage circuit, implementing more easy.
Below illustrative embodiments of the present invention is illustrate and described particularly.Should be appreciated that, the invention is not restricted to disclosed embodiment, on the contrary, the invention is intended to contain the various amendment and equivalent replacement that comprise within the scope of the appended claims.
Claims (12)
1. prevent a liquid crystal display drive circuit for lower electric ghost, it is characterized in that, comprising:
Source circuit, for exporting one first voltage to multiple pixel electrode;
Common voltage circuit, for exporting one second voltage to common electrode; And
Commutation circuit;
Wherein, when under system, electricity is to a threshold value, by the effect of described commutation circuit, together with the output of described source circuit is coupled to the output of described common voltage circuit.
2. liquid crystal display drive circuit as claimed in claim 1, is characterized in that, together with the output of described source circuit to be coupled to the output of described common voltage circuit via one first resistive element.
3. liquid crystal display drive circuit as claimed in claim 2, it is characterized in that, described source circuit comprises multiple first impact damper, and described first voltage one of to be exported in described multiple pixel electrode by one first path by each described first impact damper; When under system, electricity is to described threshold value, by the control of described commutation circuit, together with the output of described source circuit to be coupled to the output of described common voltage circuit via one first resistive element by one second path by each first impact damper.
4. liquid crystal display drive circuit as claimed in claim 3, it is characterized in that, described source electrode drive circuit comprises multiple first impact damper, and the output terminal correspondence of each described first impact damper one of to couple in described multiple pixel electrode; Described commutation circuit comprises multiple on-off element, the first end correspondence of described multiple on-off element is coupled to the output terminal of described multiple first impact damper, and the second end of described multiple on-off element is all coupled by the output of described first resistive element and described common voltage circuit; When under system, electricity is to described threshold value, described multiple on-off element is all closed to form described second path, together with being coupled to the output of described common voltage circuit via described first resistive element by the output terminal of described multiple first impact damper.
5. liquid crystal display drive circuit as claimed in claim 4, it is characterized in that, described common voltage circuit comprises one second impact damper, the output terminal of described multiple first impact damper is coupled to the first end of described first resistive element, the output terminal of described second impact damper is coupled to the second end of described first resistive element, together with the output of described source circuit being coupled to the output of described common voltage circuit.
6. liquid crystal display drive circuit as claimed in claim 5, it is characterized in that, described liquid crystal display drive circuit also comprises:
Power circuit, for providing voltage to described source circuit and described common voltage circuit;
Testing circuit, during for detecting that the voltage that described power circuit provides is down to a predetermined voltage, under judging described system, electricity is to described threshold value, and send the first control signal to described commutation circuit, together with the output of described source circuit being coupled to the output of described common voltage circuit via one first resistive element.
7. liquid crystal display drive circuit as claimed in claim 6, it is characterized in that, described testing circuit, time also for detecting that the voltage that described power circuit provides is down to described predetermined voltage, sends the second control signal to described multiple first impact damper and described second impact damper; When described testing circuit detects that the voltage that described power circuit provides is down to described predetermined voltage, send described second control signal to described multiple first impact damper of described source circuit and described second impact damper of described common voltage circuit and turn off described first impact damper and described second impact damper, and send described first control signal to described multiple on-off element of described commutation circuit and close described multiple on-off element, make the output short circuit of described multiple first impact damper, then couple via the output terminal of described first resistive element and described second impact damper.
8. liquid crystal display drive circuit as claimed in claim 7, it is characterized in that, also couple the first end of the second resistive element between described second end of described multiple on-off element and the described first end of described first resistive element, the second end of described second resistive element controls and ground terminal via the first on-off element; When the voltage detecting that described power circuit provides is down to described predetermined voltage, described testing circuit sends the 3rd control signal to described first on-off element and closes described first on-off element, to discharge via the branch road at described second resistive element place simultaneously.
9. liquid crystal display drive circuit as claimed in claim 2, it is characterized in that, described source circuit and described commutation circuit are arranged on the first chip, and described common voltage circuit is arranged on the second chip, and described first chip and described second chip are separate chip.
10. liquid crystal display drive circuit as claimed in claim 5, it is characterized in that, described source circuit, described commutation circuit and described common voltage circuit are integrated on same 3rd chip.
11. 1 kinds of liquid crystal display drive circuits preventing lower electric ghost, is characterized in that, comprising:
Source circuit, for exporting one first voltage to multiple pixel electrode;
Common voltage circuit, for exporting one second voltage to common electrode; And
Commutation circuit;
Wherein, when under system, electricity is to a threshold value, by the effect of described commutation circuit, the output of described source circuit is coupled to earth terminal via one the 3rd resistive element, the output of described common voltage circuit is coupled to earth terminal via one the 4th resistive element, and the resistance of described 3rd resistive element and described 4th resistive element configures with predetermined ratio, to make the output of described source circuit consistent with the output discharge rate of described common voltage circuit.
12. 1 kinds of method for driving liquid crystal display preventing lower electric ghost, for comprising the driving of the liquid crystal display circuit of source circuit and common voltage circuit, described source circuit is used for exporting one first voltage to multiple pixel electrode, described common voltage circuit, for exporting one second voltage to common electrode, it is characterized in that, comprise the steps:
The whether lower electricity of detection system is to a threshold value;
When electricity being detected under system to described threshold value, by the effect of commutation circuit, the output of the output of source circuit potential circuit is together coupled to together.
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