CN103489419A - Polarity-reversal driving circuit and method of liquid crystal display and liquid crystal display - Google Patents
Polarity-reversal driving circuit and method of liquid crystal display and liquid crystal display Download PDFInfo
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Abstract
The invention provides a polarity-reversal driving circuit of a liquid crystal display. The driving circuit comprises a data processing circuit, a time sequence control circuit and a source electrode driver. The data processing circuit is used for counting preset pixel line signals, wherein the pixel line signals comprise feature line signals which are the pixel line signals after the Xth row, the Xth row of pixel line signals are located in a non-display area, and the distance between the Xth row of pixel line signals and the first row of pixel line signals of a next frame exceeds three rows of pixel line signals. The time sequence control circuit is used for generating corresponding polarity-reversal control signals according to the count of the pixel line signals and includes like polarity control signals generated when the feature line signals are counted, the like polarity control signals are polarity-reversal control signals which control polarity of the feature line signals to be consistent with polarity of the first row of pixel line signals of the next frame. The source electrode driver is used for controlling the liquid crystal display to perform polarity reversal according to the polarity-reversal control signals.
Description
Technical field
The embodiment of the present application relates to the technical field of liquid crystal display, particularly relates to a kind of reversal of poles driving circuit of liquid crystal display, a kind of polarity reversal driving method of liquid crystal display, and a kind of liquid crystal display, and, a kind of driving method of liquid crystal display.
Background technology
Liquid crystal display (Liquid Crystal Display, LCD) have that lower consumption of electric power, resolution are high, the color saturation advantages of higher, extensively popularized at numerous electronic applications such as computing machine, LCD TV, mobile devices, closely bound up with people's life.
When the voltage that applies for a long time same polarity, during in liquid crystal molecule, liquid crystal molecule can be deteriorated, even stop applying a voltage on this liquid crystal molecule, the light penetration rate that liquid crystal also can occur can't return to the situation that applies the light penetration before voltage.Therefore, need often to change the polarity of the image voltage that applies, and make the signal of video signal interchangeization.Deteriorated in order to prevent liquid crystal molecule, change in each frame and put on the polarity of the signal of video signal on each picture element and to drive liquid crystal indicator, change the polarity of signal of video signal and drive the method for liquid crystal indicator to be called the frame inversion driving method in each frame.
But, while using the frame inversion driving method, the change in polarity cycle of signal of video signal can be hanged down frame, is shown, can there is the problem that occurs flicker (Flicker) in display frame on the spot.Polarity due to signal of video signal in same frame is identical again, can be because be subject to putting on the impact of signal of video signal on other picture element and row signal, and crosstalk become greatly, the deteriorated problem of picture.
In prior art, deteriorated in order to prevent liquid crystal, carry out reversal of poles after 1 frame (Frame) or a plurality of frame (Frame), but no matter adopt which kind of type of drive, all can bright concealed wire band appear start line under itself Flicker picture and specific picture on its driving direction, as shown in Figure 1, have a strong impact on the display effect of LCDs picture.
Switching different pictures, make this phenomenon understand some Pattern(display frame) have the picture blanking bar, some picture does not have the picture blanking bar, switches different type of drive, makes the meeting of picture blanking bar along with type of drive changes.
For example, the capable picture element line of 1+2Line Dot Flicker Pattern(1+2 signaling point flickering display picture), the capable picture element line of 2Line Dot Flicker Pattern(2 signaling point flickering display picture), Black(black display frame entirely), the complete white display frame of White(), the display frame of Gray Bar(GTG) in the reversion of the capable picture element line of 1+2Line Dot Inversion(1+2 signaling point) and the capable picture element line of 2Line Dot Inversion(2 signaling point reverse) type of drive under, the blanking bar of appearance is as shown in the table.
Therefore, need at present the urgent technical matters solved of those skilled in the art to be exactly: a kind of reversion driving mechanism of liquid crystal display is provided, and the problem of blanking bar appears in the start line in order to solution on driving direction.
Summary of the invention
The embodiment of the present application technical matters to be solved is to provide a kind of reversal of poles driving circuit of liquid crystal display and a kind of polarity reversal driving method of liquid crystal display, and the problem of blanking bar appears in the start line in order to solution on driving direction.
Accordingly, the embodiment of the present application also provides the driving method of a kind of liquid crystal display and a kind of liquid crystal display, in order to guarantee the implementation and application of foregoing circuit and method.
In order to address the above problem, the embodiment of the present application discloses a kind of reversal of poles driving circuit of liquid crystal display, comprising:
Data processing circuit, counted for the picture element line signal to preset; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
Sequential control circuit, for the counting according to described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Source electrode driver, carry out reversal of poles for according to described reversal of poles control signal, controlling described liquid crystal display.
Preferably, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
Preferably, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
Preferably, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
The embodiment of the present application also discloses a kind of polarity reversal driving method of liquid crystal display, comprising:
Preset picture element line signal is counted; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
According to the counting of described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Control described liquid crystal display according to described reversal of poles control signal and carry out reversal of poles.
Preferably, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
Preferably, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
Preferably, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
The embodiment of the present application also discloses a kind of liquid crystal display, comprising:
Data processing circuit, counted for the picture element line signal to preset; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
Sequential control circuit, for the counting according to described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Source electrode driver, carry out reversal of poles for according to described reversal of poles control signal, controlling described liquid crystal display.
The embodiment of the present application also discloses a kind of driving method of liquid crystal display, comprising:
Low voltage differential signal receiving;
Adopting described Low Voltage Differential Signal to carry out corresponding driving processes;
When described liquid crystal display is carried out reversal of poles, described driving is processed and is comprised:
Preset picture element line signal is counted; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
According to the counting of described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Control described liquid crystal display according to described reversal of poles control signal and carry out reversal of poles.
With background technology, compare, the application comprises following advantage:
The application switches to the polarity of the first row picture element line signal of next frame by the polarity of the picture element line signal by non-display area, the polarity of two frames is switched at non-display area.The impact that now public electrode voltages is coupled only occurs in non-display area.Before the data of next frame arrive, public electrode voltages has returned to normal condition, avoids common electrode voltage on business to be subject to level difference and affects the pressurization of liquid crystal, has eliminated the blanking bar of the start line on driving direction.
The application is applicable to the type of drive of various polarity reversion, and applicability is high, practical.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of blanking bar;
Fig. 2 is the structural representation of picture element;
Fig. 3 is that liquid crystal display polarity is sent out the type of drive exemplary plot turned;
Fig. 4 is the type of drive schematic diagram of a reversion;
Fig. 5 is the flicker pattern diagram of a reversion;
Fig. 6 is the equivalent circuit diagram of picture element;
Fig. 7 is the sequential chart that adopts 1+2Line Dot Inversion public electrode voltages, data line signal, vertical synchronizing signal under 1+2Line Dot Flicker Pattern;
Fig. 8 is the sequential chart of public electrode voltages while adopting 1+2Line Dot Inversion to carry out reversal of poles under 1+2Line Dot Flicker Pattern, data line signal, vertical synchronizing signal;
Fig. 9 is the picture element line signal schematic representation of non-display area and effective coverage;
Figure 10 is the structured flowchart of reversal of poles driving circuit of a kind of liquid crystal display of the application;
Figure 11 is the flow chart of steps of polarity reversal driving method embodiment of a kind of liquid crystal display of the application;
Figure 12 is the structured flowchart of driving circuit of a kind of liquid crystal display of the application;
Figure 13 is the flow chart of steps of driving method embodiment of a kind of liquid crystal display of the application;
Figure 14 is the preferred exemplary figure of driving method embodiment of a kind of liquid crystal display of the application;
Figure 15 is a kind of liquid crystal display polarity inversion signal figure of the application;
Figure 16 A-Figure 16 D is a kind of liquid crystal display reversal of poles comparison diagram of the application.
Embodiment
For above-mentioned purpose, the feature and advantage that make the embodiment of the present application can become apparent more, below in conjunction with the drawings and specific embodiments, the embodiment of the present application is described in further detail.
Liquid crystal display is to consist of a plurality of picture elements (Pixel), by the many source drive lines that are parallel to each other, and many grid drive wires that are parallel to each other vertical with the source drive line, be provided with membrane transistor (the Thin Film Transistor as active member on its cross section, TFT), contain liquid crystal between picture element, picture element includes by memory capacitance (Cst), show electric capacity (Clc), grid (G), composition equivalent capacity Cgd between drain electrode (D) and source electrode (S), Cgs, Cds, TFT, raster polar curve (Gate), data source polar curve (Source) and liquid crystal, concrete structure can be with reference to shown in Fig. 2.Wherein, cell is a picture element unit, and Vcs is memory capacitance voltage, and Vcom is public electrode voltages.
When the signal that scans grid N bar (Gate N) line is the Von(TFT cut-in voltage) time, TFT on Gate N line becomes conducting state, remaining TFT becomes off-state, and the signal of video signal that the signal drive circuit of liquid crystal display (source electrode driver) produces only is applied on the picture element of the TFT that contains conducting state.The voltage difference of the image data voltage of picture element by being applied to TFT and public electrode voltages is controlled the light penetration of liquid crystal in each picture element, shows pre-fixing.
With reference to Fig. 3, show liquid crystal display polarity and send out the type of drive exemplary plot turned.As shown in Figure 3, type of drive can comprise the reversion of Frame Inversion(picture frame: after scanning complete picture, change one time driving voltage polarity), Row Inversion(line reversion: every scanning one row, change one time driving voltage polarity), the capable reversion of Column Inversion(: adopt identical driving voltage polarity with a line, the next door row adopts another polarity) and the reversion of Dot Inversion(point: every adjacent picture element driving voltage polarity is neither same).Comparatively speaking, crosstalking of Frame Inversion and Row Inversion is all not good with Flicker, and in Column Inversion and Dot Inversion, Comparatively speaking, there is Flicker in Column Inversion, crosstalk and the problem such as motion picture vertical line clause, but its chip on direction of scanning data so its chip temperature of constantization is lower substantially, and Dot Inversion the Flicker of picture, crosstalk and the motion picture vertical line all relatively good, but picture chip temperature when switching is higher.It should be noted that, which kind of polarity those skilled in the art can adopt send out the type of drive turned according to actual conditions.
In above-mentioned four kinds of type of drive, the film flicker of Dot Inversion and the best of crosstalking, wherein Dot inversion has again the reversion of the capable picture element line of 1Line Dot Inversion(1 signaling point), the reversion of the capable picture element line of 2Line Dot Inversion(2 signaling point), the capable picture element line of 1+2Line Dot Inversion(1+2 signaling point reversion).
With reference to Fig. 4, show the type of drive schematic diagram of a reversion, as shown in the figure, 1Line Dot Inversion is for from the first row picture element line signal, and the polarity of the capable picture element line of n and n+1 signal is contrary, and every frame reversal of poles is once; 2Line Dot Inversion is the capable picture element line of n, n+1 signal same polarity, and the capable picture element line of n+2, n+3 signal polarity is identical and contrary with the capable picture element line of n signal, and every frame reversal of poles once; 1+2Line Dot Inversion is the capable picture element line of n+1, n+2 signal same polarity and contrary with the capable picture element line of n signal polarity, the capable picture element line of n+3, n+4 signal same polarity and identical with the capable picture element line of n signal polarity, every frame reversal of poles once.
Carry out reversal of poles no matter adopt what type of drive, when specific picture appears in capital in whole picture all less than the positive and negative change in polarity occurred with certain brightness, be also in whole picture arbitrary moment be same polarity with certain brightness, thereby make liquid crystal capacitance on vertical and horizontal direction, all can not occur high frequency polarity exchange, the phenomenon of film flicker is still very serious, as shown in Figure 5.Wherein 1Line Dot Inversion is in the capable picture element line of 1Line Dot Flicker Pattern(1 signaling point flicker pattern) occur that down bright picture is all positive polarity, so the polarity exchange of high frequency all can not appear in liquid crystal capacitance on vertical and horizontal direction, average result is the phenomenon of film flicker or very serious.Same 2Line Dot Inversion all there will be serious film flicker at 2Line Dot Flicker Pattern and 1+2Line Dot inversion under 1+2Line Dot Flicker Pattern.For the luminance polarity change frequency of its picture when the 1Line Dot Flicker Pattern pattern of the 1Line Dot Inversion under the 60Hz sweep frequency, be 60/2=30Hz.Change in polarity frequency for the brightness of its picture when the 2Line Dot Flicker pattern of 2Line Dot Inversion under the sweep frequency of 60Hz is 60/2=30Hz.For the luminance polarity change frequency of its picture when the 1+2Line Dot Flicker pattern of 1+2Line Dot Inversion under the sweep frequency of 60Hz, be 60/2=30Hz.
With reference to Fig. 6, show the equivalent circuit diagram of picture element.As shown in Figure 6, at the Data of Source Line(data line) while carrying out data exchange, can be applied to Vcom by Data Line, the CF of Source and the equivalent capacity Cs-vc of Vcom, make the upper electric current of picture Vcom have electric current and the change in voltage of Vcom, because the polarity at full line Line is switched simultaneously, the curent change that makes Vcom is I=Q/t=(Δ V1+ Δ V2+ ... + Δ Vn) Cs-vc/t=U/R.Wherein, Q is the quantity of electric charge, and t is discharge time, Δ V1+ Δ V2+ ... the integrated value of the voltage difference that+Δ Vn is every row Line, U represents the voltage difference of Vcom voltage source chip to TFT panel picture element, R is the Vcom line impedance.
For example, VCOM Driver(public electrode voltages driver) terminal voltage is 5V, the other end CF_VCOM of Vcom line, and establishing Vcom voltage is X, and impedance R is 10k, and be 100us discharge time, and the quantity of electric charge is 10*10
-9electric charge, according to Q/t=U/R, can calculate the value of current Vcom, i.e. 10*10
-9/ 100*10
-6=(X-5)/10*10
3, calculate X=7V, namely the Vcom deviation 2V.
To sum up, polarity is being sent out while turning, and the Vcom instantaneous variation is larger.
With reference to Fig. 7, show and adopt Vcom, Source Output(data line signal under the 1+2Line Dot Flicker Pattern of 1+2Line Dot Inversion in Fig. 5), the sequential chart of STV (vertical synchronizing signal).As shown in Figure 7, under this test pictures, each Frame first few lines Line Vcom of place is coupled by coupling() impact.Due to the Vcom voltage quasi position, with normally variant, i.e. Vcom skew is actual, makes liquid crystal deflection voltage and normal value have deviation, thereby blanking bar occurs.
With reference to Fig. 8, show Vcom, source1 and SOURCE(data line signal while adopting 1+2Line Dot Inversion to carry out reversal of poles under 1+2Line Dot Flicker Pattern), the sequential chart of STV (vertical synchronizing signal).As shown in Figure 8, need upset due to the driving of TFT_LCD panel at the positive-negative polarity of two Frame, so while having switching Frame at Source Line(data line, claim again Data Line) positive and negative data exchange and cause the variation of Vcom, make the skew that has Vcom above Frame, make this top Pixel the electric charge of charging and below different, thereby make picture have blanking bar.When the next frame switch polarity, there are opposite polarity situation in the polarity of the picture element line signal of last column and the polarity of next frame picture, when polarity between two frames is changed, form larger change in voltage, but the voltage at electric capacity two ends can not suddenly change, curent change computing formula according to above-mentioned Vcom, I=Q/t=(Δ V1+ Δ V2+ ... + Δ Vn) Cs-vc/t=U/R, can learn, need to be in certain hour t supplemental current, thereby make whole Vcom be offset, form blanking bar.
Generally speaking, all can there be viewing area (effective coverage) in LCDs, the zone that can show in LCDs, and non-display area (Blank district), and the zone that can't show on the LCDs example, as shown in Figure 9; Wherein STV is vertical synchronizing signal.It should be noted that, Line is picture element line signal, on meaning directly perceived, is the line that liquid crystal display a line picture element forms, and claims again scan signal line.In this example, in a frame (Frame), the effective display area of LCDs has the capable picture element line of M signal, and wherein, M is positive integer.For example the resolution of LCDs is 1920*1080, and effective display area has 1080 row picture element line signals, but non-display area also has the capable picture element line of 2-40 signal, in order to show image, may need the data of 1100 row picture element line signals.
In conjunction with above-mentioned analysis, one of core idea of the embodiment of the present application is, switch to the polarity of next frame the first row picture element line signal by the polarity of the picture element line signal by the Blank district, make the polarity between two frames switch in the Blank district, the impact that the Vcom skew causes also is limited in the Blank district thereupon, is about to blanking bar and is limited in the Blank district.
With reference to Figure 10, show the structural drawing of reversal of poles driving circuit of a kind of liquid crystal display of the application, specifically can comprise:
It should be noted that, the characteristic curve signal is for needs switch the picture element line signal identical with next frame the first row picture element line signal polarity, its essence or picture element line signal.X is positive integer.The above and below of liquid crystal display all has the Blank district, but the characteristic curve signal is as long as be the picture element line signal after capable the reaching of X that is positioned at the Blank district, and the embodiment of the present application is not limited this.
As the above analysis, only at each Frame, just exist at first the difference of positive and negative switching to cause that Source Line voltage is subject to the Coupling impact.In actual applications, mainly concentrate on the initial Vcom of the appearance skew of every frame, but just recovered fully in the time of about 8 to 9 row Line.In the embodiment of the present application, at least 4 row Line(before next frame the first row Line can be comprised to the 4th row Line) polarity switch to the polarity identical with it, blanking bar disappears substantially.
For further promoting the effect of eliminating blanking bar, at least 9 row Line(before next frame the first row Line can be comprised to the 9th row Line) polarity switch to the polarity identical with it.The capable picture element line of X signal is at a distance of the picture element line signal that surpasses 8 row with next frame the first row picture element line signal.
Suppose that the total K(K of liquid crystal display is positive integer) row Line, K-X>3; Preferably, K-X>8.
It should be noted that, the reversal of poles control signal comprises the same polarity control signal, and the same polarity control signal is for the characteristic curve signal of the polarity identical with next frame the first row Line with respect to needs switchings, and its essence is also the reversal of poles control signal.
Normally generating corresponding polarity for the counting of other picture element line signals sends out and turns control signal.
In actual applications, need the polarity of sending out the mode of turning and current picture element line signal according to the polarity of current employing to generate corresponding reversal of poles control signal, the embodiment of the present application does not describe in detail one by one at this.
It should be noted that, when current polarity inversion signal is the same polarity control signal, source electrode driver, for according to described same polarity control signal, switches to the polarity of described characteristic curve signal the polarity of next frame the first row picture element line signal.
The capable polarity that reaches Line afterwards of X is after switching, and polarity need to remain to next frame.
The application switches to the polarity of the first row picture element line signal of next frame by the polarity of the picture element line signal by non-display area, the polarity of two frames is switched at non-display area.The impact that now public electrode voltages is coupled only occurs in non-display area.Before the data of next frame arrive, public electrode voltages has returned to normal condition, avoids common electrode voltage on business to be subject to level difference and affects the pressurization of liquid crystal, has eliminated the blanking bar of the start line on driving direction.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
Wherein, described M is positive integer.1+2Line Dot Inversion is the capable picture element line of n+1, n+2 signal same polarity and contrary with the capable picture element line of n signal polarity, the capable picture element line of n+3, n+4 signal same polarity and identical with the capable picture element line of n signal polarity, every frame reversal of poles once.
Suppose that the total K(K of liquid crystal display is positive integer) row Line, M+2≤X<K-3; Preferably, M+2≤X<K-8.In actual applications, X can be M+2, can be also M+3, can be since the capable Line switch polarity of M+2, also can be since the capable Line switch polarity of M+3, and the embodiment of the present application is not limited this.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
Wherein, described M is positive integer.2Line Dot Inversion is the capable picture element line of n, n+1 signal same polarity, and the capable picture element line of n+2, n+3 signal polarity is identical and contrary with the capable picture element line of n signal, and every frame reversal of poles once.
Suppose that the total K(K of liquid crystal display is positive integer) row Line, M+1≤X<K-3; Preferably, M+1≤X<K-8.In actual applications, X can be M+1, can be also M+2, can be since the capable Line switch polarity of M+1, also can be since the capable Line switch polarity of M+2, and the embodiment of the present application is not limited this.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
Wherein, described M is positive integer; 1Line Dot Inversion is for from the first row picture element line signal, and the polarity of the capable picture element line of n and n+1 signal is contrary, and every frame reversal of poles once.
Suppose that the total K(K of liquid crystal display is positive integer) row Line, M+1≤X<K-3; Preferably, M+1≤X<K-8.In actual applications, X can be M+1, can be also M+2, can be since the capable Line switch polarity of M+1, also can be since the capable Line switch polarity of M+2, and the embodiment of the present application is not limited this.
Certainly, above-mentioned polarity is sent out the span of the type of drive that turns and characteristic curve signal just as example, when implementing the embodiment of the present application, can other polarity be set according to actual conditions and send out the type of drive that turns and the span of characteristic curve signal, for example Frame Inversion, Row Inversion, Column Inversion etc., the embodiment of the present application is not limited this.
The application is applicable to the type of drive of various polarity reversion, and applicability is high, practical.
With reference to Figure 11, show the flow chart of steps of polarity reversal driving method embodiment of a kind of liquid crystal display of the application; Specifically can comprise the steps:
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
For embodiment of the method, for simple description, therefore it all is expressed as to a series of combination of actions, but those skilled in the art should know, the embodiment of the present application is not subject to the restriction of described sequence of movement, because according to the embodiment of the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in instructions all belongs to preferred embodiment, and related action might not be that the embodiment of the present application is necessary.
For polarity reversal driving method embodiment, because it is substantially similar to reversal of poles driving circuit embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of reversal of poles driving circuit embodiment.
The application provides a kind of liquid crystal display embodiment, specifically can comprise:
Data processing circuit, counted for the picture element line signal to preset; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
Sequential control circuit, for the counting according to described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Source electrode driver, carry out reversal of poles for according to described reversal of poles control signal, controlling described liquid crystal display.
For making those skilled in the art better understand the embodiment of the present application, below by a concrete example, describe.
With reference to Figure 12, show the structured flowchart of driving circuit of a kind of liquid crystal display of the application.As shown in the figure, this liquid crystal display can comprise, picture element, timing controller (Tcon), power management module (PMU), source electrode driver and gate drivers.
Wherein, described timing controller Tcon can comprise:
Data receiver circuit, can be for low voltage differential signal receiving (LVDS);
Data processing circuit, can be counted for the picture element line signal to preset; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
Described data processing circuit can also be for storing Low Voltage Differential Signal (LVDS) and carrying out the conversion process of view data; In practical application, need to do signal lag to the LVDS signal and process and the view data conversion process, for example, the conversion process of described view data can comprise that color range (Gamma) is proofreaied and correct, GTG (OD) is proofreaied and correct etc., and general minimum is also stored the hemistich data;
Data converting circuit, can carry out for the transistor-transistor logic level data (TTL) by preset colourity (Gamma) conversion process and other conversion process;
Sequential control circuit, for the counting according to described picture element line signal, generate corresponding reversal of poles control signal (POL); Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Described sequential control circuit can also be for generation of signal sequence; For example, described signal sequence can comprise output enable control signal (OE) that data won and exported the clock signal (CKV), grid of control signal (TP), scanning and drive, picture element (Cell) discharge control signal (XON) etc.;
Data output circuit, can device corresponding to the control signal of generation export to; For example, can comprise view data (RGB Data), reversal of poles control signal (POL), data are won and export the control signal such as control signal (TP) exports source electrode driver to, the control signals such as the output enable control signal (OE) that the clock signal (CKV) of scanning, grid are driven, picture element discharge control signal (Xon) export gate drivers to;
Source electrode driver, carry out reversal of poles for according to described reversal of poles control signal, controlling described liquid crystal display;
Described source electrode driver can also be for adopting view data (RGB Data), data are won and export the signal such as control signal (TP) and carry out corresponding picture element and drive;
Gate drivers, can carry out corresponding picture element for signals such as the output enable control signal (OE) that adopts clock signal (CKV), grid to drive, picture element discharge control signals (Xon) and drive;
Power management module (PMU), can be for exporting digital power to timing controller (Tcon), source electrode driver and gate drivers, analog voltage (AVDD) produces public electrode voltages (Vcom) and colourity (Gamma), the cut-in voltage Von of the membrane transistor (TFT) of generation picture element and close voltage Voff.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
With reference to Figure 13, show the flow chart of steps of driving method embodiment of a kind of liquid crystal display of the application, can comprise the steps:
It should be noted that, adopting described Low Voltage Differential Signal to carry out corresponding driving processing is in order to drive liquid crystal display normally to show, the embodiment of the present application does not describe in detail one by one at this.
When described liquid crystal display is carried out reversal of poles, described driving is processed and is comprised:
Preset picture element line signal is counted; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
According to the counting of described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Control described liquid crystal display according to described reversal of poles control signal and carry out reversal of poles.
For making those skilled in the art understand better the embodiment of the present application, in this manual, the first row Line that is the characteristic signal line by X=M+2(X, the viewing area of liquid crystal display has the capable Line of M) a kind of example of sending out the type of drive turned as polarity describes.
As shown in figure 14, liquid crystal display receives Low Voltage Differential Signal (LVDS data) afterwards, will be stored and carry out corresponding display driver and process the LVDS data.Carrying out polarity when liquid crystal display sends out while turning, carry out the counting of direction of scanning, when current Line is M+2 when capable, during by the capable Line of X, its polarity is switched to the polarity of next frame the first row Line, when current Line is greater than M+2 when capable, keep its polarity identical with the polarity of the capable Line of M+2.For example, the polarity of the 1st row Line of next Frame is the L(low level), when reversal of poles, X is capable, and the polarity that reaches Line afterwards switches to the L(low level), remain to next Frame, as shown in figure 15 always.In other situations, carry out normal polarity (POL) reversion, for example, when type of drive is 1Line Dot Inversion, POL carries out every row reversion once, and each Frame reversion once.
With reference to Figure 16 A-Figure 16 D, show a kind of liquid crystal display reversal of poles comparison diagram of the application.As shown in Figure 16 A, " POL before improving " indicates the polarity inversion signal while normally being reversed, and " POL after improving " indication the embodiment of the present application switches to the polarity of the capable Line of Blank district X and Line afterwards the polarity of the first row Line of next Frame.As shown in Figure 16 B, POL after application improves, now Vcom is subject to coupling and only occurs in Blank district (by the position in enclosing), and before the next frame data arrive, Vcom has returned to normal condition, avoids being subject to because of Vcom the pressurization of level differentia influence liquid crystal.As shown in Figure 16 C, reversal of poles is normally carried out in " mode before " indication, positive and negative data exchange and cause and make the variation of Vcom the skew (part in being enclosed) that has Vcom above Frame, thereby make picture have blanking bar.As shown in Figure 16 D, after " mode before " indication application improves, POL carries out reversal of poles, through confirming picture, and Flicker Patten top blanking bar disappear (part in being enclosed).
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
In a preferred embodiment of the present application, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
For embodiment of the method, for simple description, therefore it all is expressed as to a series of combination of actions, but those skilled in the art should know, the embodiment of the present application is not subject to the restriction of described sequence of movement, because according to the embodiment of the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in instructions all belongs to preferred embodiment, and related action might not be that the embodiment of the present application is necessary.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
Those skilled in the art should understand, the embodiment of the embodiment of the present application can be provided as method, device or computer program.Therefore, the embodiment of the present application can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect fully.And the embodiment of the present application can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code one or more.
The embodiment of the present application is to describe with reference to process flow diagram and/or the block scheme of method, mobile device (system) and computer program according to the embodiment of the present application.Should understand can be in computer program instructions realization flow figure and/or block scheme each flow process and/or the flow process in square frame and process flow diagram and/or block scheme and/or the combination of square frame.Can provide processor that these computer program instructions process mobile device to multi-purpose computer, special purpose computer, Embedded Processor or other programmable datas to produce a machine, make and process by computing machine or other programmable datas the instruction that the processor of mobile device carries out and produce for realizing the device in the function of flow process of process flow diagram or a plurality of flow process and/or square frame of block scheme or a plurality of square frame appointments.
These computer program instructions also can be stored in the energy vectoring computer or other programmable datas are processed in the computer-readable memory of mobile device with ad hoc fashion work, make the instruction be stored in this computer-readable memory produce the manufacture that comprises command device, this command device is realized the function of appointment in flow process of process flow diagram or a plurality of flow process and/or square frame of block scheme or a plurality of square frame.
These computer program instructions also can be loaded into computing machine or other programmable datas are processed on mobile device, make and carry out the sequence of operations step to produce computer implemented processing on computing machine or other programmable movement equipment, thereby the instruction of carrying out on computing machine or other programmable movement equipment is provided for realizing the step of the function of appointment in flow process of process flow diagram or a plurality of flow process and/or square frame of block scheme or a plurality of square frame.
Although described the preferred embodiment of the embodiment of the present application, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the embodiment of the present application scope.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operational zone, and not necessarily requires or imply between these entities or operation the relation of any this reality or sequentially of existing.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make the process, method, article or the mobile device that comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or mobile device.In the situation that not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the mobile device that comprises described key element and also have other identical element.
The reversal of poles driving circuit of above a kind of liquid crystal display that the embodiment of the present application is provided, a kind of polarity reversal driving method of liquid crystal display, a kind of liquid crystal display, and, a kind of driving method of liquid crystal display, be described in detail, applied specific case herein principle and the embodiment of the embodiment of the present application are set forth, the explanation of above embodiment is just for helping to understand method and the core concept thereof of the embodiment of the present application; Simultaneously, for one of ordinary skill in the art, the thought according to the embodiment of the present application, all will change in specific embodiments and applications, and in sum, this description should not be construed as the restriction to the embodiment of the present application.
Claims (10)
1. the reversal of poles driving circuit of a liquid crystal display, is characterized in that, comprising:
Data processing circuit, counted for the picture element line signal to preset; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
Sequential control circuit, for the counting according to described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Source electrode driver, carry out reversal of poles for according to described reversal of poles control signal, controlling described liquid crystal display.
2. reversal of poles driving circuit according to claim 1, is characterized in that, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
3. reversal of poles driving circuit according to claim 1, is characterized in that, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
4. reversal of poles driving circuit according to claim 1, is characterized in that, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
5. the polarity reversal driving method of a liquid crystal display, is characterized in that, comprising:
Preset picture element line signal is counted; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
According to the counting of described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Control described liquid crystal display according to described reversal of poles control signal and carry out reversal of poles.
6. polarity reversal driving method according to claim 5, is characterized in that, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When the type of drive of described reversal of poles is 1+2Line Dot Inversion, described X is more than or equal to M+2.
7. polarity reversal driving method according to claim 5, is characterized in that, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 2Line Dot Inversion, described X is more than or equal to M+1.
8. polarity reversal driving method according to claim 5, is characterized in that, described liquid crystal display has viewing area, and described viewing area has the capable picture element line of M signal;
When described polarity is sent out the type of drive turned and is 1Line Dot Inversion, described X is more than or equal to M+1.
9. a liquid crystal display, is characterized in that, comprising:
Data processing circuit, counted for the picture element line signal to preset; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
Sequential control circuit, for the counting according to described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Source electrode driver, carry out reversal of poles for according to described reversal of poles control signal, controlling described liquid crystal display.
10. the driving method of a liquid crystal display, is characterized in that, comprising:
Low voltage differential signal receiving;
Adopting described Low Voltage Differential Signal to carry out corresponding driving processes;
When described liquid crystal display is carried out reversal of poles, described driving is processed and is comprised:
Preset picture element line signal is counted; Wherein, described picture element line signal comprises the characteristic curve signal, and described characteristic curve signal is the capable picture element line signal afterwards that reaches of X, wherein, the capable picture element line of X signal is positioned at non-display area, for next frame the first row picture element line signal, surpassing the picture element line signal of 3 row apart;
According to the counting of described picture element line signal, generate corresponding reversal of poles control signal; Comprise the same polarity control signal generated when counting down to the characteristic curve signal; The reversal of poles control signal that the polarity that described same polarity control signal is the described characteristic curve signal of control and the polarity of next frame the first row picture element line signal are consistent;
Control described liquid crystal display according to described reversal of poles control signal and carry out reversal of poles.
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |