CN102568400A - Driving method of liquid crystal display - Google Patents
Driving method of liquid crystal display Download PDFInfo
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- CN102568400A CN102568400A CN2010105977679A CN201010597767A CN102568400A CN 102568400 A CN102568400 A CN 102568400A CN 2010105977679 A CN2010105977679 A CN 2010105977679A CN 201010597767 A CN201010597767 A CN 201010597767A CN 102568400 A CN102568400 A CN 102568400A
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Abstract
The invention discloses a driving method of a liquid crystal display. In an embodiment, when each frame is inserted with a black picture, a capacity coupling effect is utilized, and the driving voltage of a liquid crystal molecule is increased, thereby reducing the power supply loss of the display, and improving the brightness, the reliability and the stability of the display.
Description
Technical field
The present invention relates to a kind of driving method of LCD, particularly relate to a kind of driving method of field sequence LCD device.
Background technology
Usually the driving method of LCD has two kinds: colored filter (color filter) type of drive and look preface (Field Sequential Color) type of drive.
The colored filter driving method is that pixel segmentation is become three pixel redness, green and the resistances of blue look of corresponding colored filter respectively; Produce three primary colors to form color; The field sequence LCD device driving method does not need colored filter, uses single kind of pixel to cooperate the backlight of red, green, blue look, utilizes sequential to show sprites such as red, blue, green; Persist the display frame color by human eye vision.
Fig. 1 shows a kind of look preface driving method.With frame rate 60Hz is example, and a look preface driving method is divided into frame four times with a frame, is respectively red (R), green (G), blue (B), with the inferior frame of black (K).Except black time frame (K) has only between black picture write area 101, all the other each time frames all are divided into three parts: between the data write area 102, liquid crystal reaction interval 103, backlight open interval 104.In another kind of look preface driving method, 101 are present in (or afterwards) before each time frame or each frame between black picture write area, and therefore frame always has between three or black picture write area 101.
One of purpose that writes the black picture is to be used to the liquid crystal molecule of resetting, and making liquid crystal molecule all is the start angle deflection of fixing since one when driving each time.In addition, for different types of LCD, write the black picture and possibly bring different influences.
Fig. 2 A and Fig. 2 B show a kind of optical compensation curved LCD 10 (optically compensated bend liquid crystal display; OCB LCD), before getting into normal display state, must apply operating voltage and be worse than between upper substrate 12 and the infrabasal plate 13; Make the liquid crystal molecule 11 between two substrates; Convert bending status (bend state is like Fig. 2 B) to by extension attitude (splay state is like Fig. 2 A); And, when display operation, must keep operating voltage greater than critical voltage Vcr, make liquid crystal molecule 11 remain on bending status.
There is document to point out, inserts black picture, can reduce the brightness of its required critical voltage Vcr, lifting panel if optical compensation curved LCD comprises use look preface driving method.Yet, for the LCD of some type, for example optical compensation curved LCD, the voltage that inserts black picture can't boundlessly be increased.The brightness of Fig. 3 display optical compensated bend LCD and the graph of a relation that puts on the voltage of liquid crystal molecule.When the voltage that puts on liquid crystal molecule was about 5 volts of P1 point, all liquid crystal deflecting elements made liquid crystal display displays deceive picture to the special angle that interdicts backlight.That is the P1 point voltage promptly is when inserting black picture interval 101 (like Fig. 1), to put on the voltage on the liquid crystal molecule traditionally.When the voltage that puts on liquid crystal molecule was about 6 volts of P2 point, liquid crystal deflection speed increased, and can reduce and insert black picture interval 101.When the voltage that puts on liquid crystal molecule when increasing to more than 8 volts, may make liquid crystal deflecting element excessive, cause light leak.In addition, if increase the write time of inserting black picture,, equally also can sacrifice the demonstration time of RGB picture though can let the effect of black plug picture increase.
Therefore; Needing badly provides a kind of new LCD framework and driving method; Suitably increase and insert the interval driving voltage of black picture, can reduce the time of inserting black picture, the brightness that promotes display, and; Can reduce the critical voltage of optical compensation curved LCD, lower electrical source consumption, increase fiduciary level and degree of stability.
Summary of the invention
The object of the present invention is to provide a kind of new driving method; Suitably increase and insert the interval driving voltage of black picture; Can reduce the time of inserting black picture, the brightness that promotes display; And, can reduce the critical voltage of optical compensation curved LCD, lower electrical source consumption, increase fiduciary level and degree of stability.
According to above-mentioned purpose; The embodiment of the invention provides a kind of driving method of LCD; Be applied to LCD, this LCD comprises many data lines and many gate lines, and defines a plurality of pixels by this; Each this pixel comprises by pixel electrode and the formed liquid crystal capacitance of public electrode and by this pixel electrode and the formed storage capacitors of pairing bias line; Wherein, this bias line is positioned at this pixel electrode below, and this method comprises: give this public electrode and this bias line different voltages with different source respectively; Write redness, green and blue picture and at least one black picture in each display frame; During this black picture inserts; Pixel electrode to first pixel writes first data-signal; And pairing first bias line of this first pixel write the first bias line voltage and this public electrode is write public electrode voltages; Wherein, This first data-signal has the first identical polarity with this first bias line voltage; This bias line voltage causes coupling effect; Make the public electrode of this first pixel and the voltage difference between this pixel electrode reach first voltage difference, this first voltage difference is greater than the required voltage difference of liquid crystal deflecting element to the special angle that interdicts this backlight of layer of liquid crystal molecule in the liquid crystal capacitance that makes this first pixel.
Description of drawings
Fig. 1 shows a kind of existing look preface driving method;
Fig. 2 A and Fig. 2 B show a kind of existing optical compensation curved LCD;
Fig. 3 shows the brightness and the graph of a relation that puts on the voltage of liquid crystal molecule of an existing optical compensation curved LCD;
Fig. 4 A to Fig. 4 D shows the method according to four kinds of reversal of poles of the embodiment of the invention;
Fig. 5 shows a color order liquid crystal display driving method according to an embodiment of the invention;
Fig. 6 A shows the dot structure embodiment that is cooperated like Fig. 5 driving method;
The equivalent circuit diagram of Fig. 6 B displayed map 6A dot structure;
Fig. 7 shows a color order liquid crystal display driving method according to another embodiment of the present invention; And
Fig. 8 show such as Fig. 7 driving method the equivalent circuit diagram of cooperation dot structure.
Embodiment
Each embodiment of this case below will be detailed, and combine accompanying drawing as illustration.Except these were described in detail, the present invention can also carry out widely in other embodiment, the substituting easily of any said embodiment, revise, equivalence changes and is included in the scope of this case, and with after claim be as the criterion.In the description of instructions, in order to make the reader the present invention there is more complete understanding, many specific detail are provided; Yet the present invention possibly still can implement at clipped or all under the prerequisite of these specific detail.In addition, well-known program step or assembly are not described in the details, with the restriction of avoiding causing the present invention unnecessary.
The present invention discloses a kind of framework and driving method of LCD, can be applicable to various types of LCDs, for example optical compensation curved LCD etc.Usually, LCD comprises upper substrate, infrabasal plate (for example plurality of groups of substrates of thin-film transistor), and liquid crystal layer is arranged between this two substrates.Public electrode is arranged on this upper substrate.Many data lines and many gate lines are arranged on the infrabasal plate, use defining a plurality of pixels, and each pixel has pixel electrode, and liquid crystal layer is between public electrode and pixel electrode.
The driving method of LCD of the present invention; It is a kind of look preface (Field Sequential Color) driving method; Therefore display does not need colored filter, only uses single kind of pixel to cooperate the backlight of red, green, blue look, utilizes sequential to show sprites such as red, blue, green; Persist the display frame color by human eye vision.In look preface driving method of the present invention, each frame has redness, green, blueness, four frames of black, and wherein black time frame comprises between at least one black picture write area 101, and is as shown in Figure 1.
The driving method of LCD of the present invention is primarily characterized in that, between each black picture write area 101 o'clock, increase the driving voltage of liquid crystal molecule, that is, the voltage difference between increasing between pixel electrode and its public electrode; Usually, the voltage of the voltage of this purpose modulated pixels electrode capable of using, modulation public electrode, or the voltage of while modulated pixels electrode and public electrode is reached.
The magnitude of voltage of public electrode is traditionally for fixing; Insert black picture interval driving voltage if desire increases this moment; Can increase the outputting data signals voltage of source electrode driver; Reach by bigger data-signal (Data) voltage to the pixel electrode of transmission, that is the voltage of modulated pixels electrode is through being controlled by source electrode driver.But this kind method can have higher manufacturing journey originally, is not best solution.
Produce phenomenons such as flicker for fear of the liquid crystal molecule polarization, LCD is through changing the polarity of pixel drive voltage, and positive polarity and negative polarity are to avoid the accumulation of electric charge.Fig. 4 A to Fig. 4 D shows the method for four kinds of reversal of poles, comprising: Fig. 4 A is frame counter-rotating (frame inversion); The 4th B figure is row counter-rotatings (column inversion); The 4th C figure is row counter-rotating (row inversion); And Fig. 4 D is some counter-rotating (dot inversion), and wherein each lattice is represented a pixel and indicated the polarity of its driving voltage.
The driving method of LCD of the present invention is according to the opposed polarity inverting method and slightly different.Fig. 5 shows a color order liquid crystal display driving method according to an embodiment of the invention, and present embodiment can be applicable to the frame counter-rotating of Fig. 4 A and the row counter-rotating of the 4th C figure, but is not limited to this.The driving method of present embodiment; The dot structure shown in Fig. 6 A of can arranging in pairs or groups; Wherein sweep trace Gn-1, Gn and data line Dn-1, Dn constitute pixel Px, and it comprises switch SW and is used for control data signal voltage (Data) and inputs to pixel electrode, and bias line Bias1 is arranged at pixel electrode PE below.The equivalent circuit diagram of Fig. 6 B displayed map 6A, public electrode and pixel electrode constitute liquid crystal capacitance Clc, and pixel electrode PE and bias line Bias1 constitute storage capacitors Cst, and public electrode is connected the different voltages with different source respectively with bias line Bias1.
Get back to Fig. 5, the pixel Px1 that reverses with row is an example, and the driving method of the embodiment of the invention is described, when frame N, is positive polarity cycle wherein, and frame N+1 is a negative polarity cycle.Black time frame (K) interval in frame N; That is the black picture inserts interval 101; Black data signal voltage (Data) 501 of source electrode driver input positive polarity is to pixel electrode; Afterwards according to the picture demand, between the data write area of blue (B), green (G), red (R) inferior frame 102, write voltage data signal 502,503,504 respectively to pixel electrode.What deserves to be mentioned is; Only insert a black frame in the present embodiment in each frame, and black frame is to be inserted in redness (R) and blue (B) interframe, so in other embodiments; Each frame is not only for insertion one black frame, and black frame also is not limited only to be inserted in redness (R) and blue (B) interframe.
Once more with reference to Fig. 5; In black time frame (K); Bias line voltage Vbias1 is changed to current potential 506 by current potential 505, and promptly potential change direction or polarity are identical with the potential change direction or the polarity of voltage data signal 501, that is belongs to positive polarity or positive pressure differential (Vbias1＞0).By this; Voltage difference delta Vbias1 (voltage difference of current potential 506 and former current potential 505) can cause capacitance coupling effect, owing to principle of charge conservation, can improve the voltage of pixel electrode; And then improve the voltage difference between pixel electrode and the public electrode (Vcom), to increase the driving voltage of liquid crystal molecule.If Δ V
PixelRepresentative after capacitive coupling, the voltage difference variable quantity between public electrode and pixel electrode, i.e. Δ V
PixelRough equaling:
Wherein, Cgs is the stray capacitance of switch SW, and Cx is a stray capacitance.Can know that by above-mentioned formula the voltage difference variable quantity of public electrode and pixel electrode is along with Δ Vbias1 increases and increases.
In addition; At black time frame interval (K), public electrode voltages (Vcom) is changed to current potential 508 by current potential 507, that is; This moment, the change in voltage of public electrode voltages and bias line voltage was in the opposite direction; And the polarity of the polarity of public electrode voltages 508 and voltage data signal 501 is opposite, by this, can further increase the driving voltage of liquid crystal molecule.It should be noted that in another embodiment of the present invention the magnitude of voltage of public electrode voltages Vcom and polarity can all keep fixing (constant value) forever but not as shown in Figure 5ly do positive and negative variation; In other words that is, increase the means of liquid crystal molecule driving voltage, mainly be that the coupling effect that the pressure reduction by bias line voltage changes produces.In addition, frame N+1 is a negative polarity cycle, and its driving principle is identical with positive polarity cycle, and just polarity is opposite, repeats no more.In addition, the driving method of present embodiment also can be analogized with the frame counter-rotating.
Fig. 7 shows a color order liquid crystal display driving method according to another embodiment of the present invention, and present embodiment can be applicable to the row counter-rotating of Fig. 4 B and the some counter-rotating of Fig. 4 D, but is not limited to this.The driving method of present embodiment can combine the dot structure shown in Fig. 6 A, but difference be in, connect different bias lines respectively with delegation's two neighbors, bias line Bias1 and bias line Bias2 receive different bias line voltage signals separately; Fig. 8 shows its equivalent circuit diagram; In facing pixel Px1 and Px2 mutually with delegation two; Public electrode and pixel electrode constitute liquid crystal capacitance Clc1 and Clc2, pixel electrode PE and bias line Bias1 constitute storage capacitors Cst1, pixel electrode PE and bias line Bias2 formation storage capacitors Cst2, and public electrode is connected the different voltages with different source respectively with bias line Bias1, Bias2 three.
Getting back to Fig. 7, is example with the pixel Px1 and the Px2 of a counter-rotating, and the driving method of the embodiment of the invention is described, wherein pixel Px1 is a positive polarity cycle when frame N, and frame N+1 is a negative polarity cycle; Pixel Px2 is a negative polarity cycle when frame N, and frame N+1 is a positive polarity cycle.For pixel Px1; Black time frame (K) interval in frame N; That is black picture insertion interval 101, voltage data signal (Data) 701 of source electrode driver input positive polarity is to pixel electrode, afterwards according to the picture demand; Between the data write area of blue (B), green (G), red (R) inferior frame 102, the voltage data signal 702,703,704 that writes positive polarity is to pixel electrode respectively.
In black time frame (K), bias line voltage Vbias1 is changed to current potential 706 by current potential 705, and the change in voltage direction of bias line voltage Vbias1 or polarity are identical with voltage data signal 701, that is, positive polarity or positive pressure differential (Vbias1＞0).By this, voltage difference delta Vbias1 (voltage difference of current potential 706 and current potential 705) can cause capacitance coupling effect, can improve the voltage difference between pixel electrode and the public electrode, and principle as previously mentioned.
For pixel Px2; Black time frame (K) interval in frame N; Voltage data signal (Data) 707 of source electrode driver input negative polarity is to pixel electrode; Afterwards according to the picture demand, between the data write area of blue (B), green (G), red (R) inferior frame 102, the voltage data signal 708,709,710 that writes negative polarity is to pixel electrode respectively.In this black time frame (K), bias line voltage Vbias2 is changed to current potential 711 by current potential 705, and the change direction of bias line voltage Vbias2 or polarity are identical with voltage data signal 707, that is, negative polarity or Negative Pressure Difference (Vbias1＞0).By this, voltage difference delta Vbias2 (voltage difference of current potential 711 and current potential 705) can cause capacitance coupling effect, can improve the voltage difference between pixel electrode and the public electrode, and principle as previously mentioned.
It should be noted that at present embodiment it is fixing that the magnitude of voltage of public electrode voltages Vcom and polarity all keep; That is; Increase the means of liquid crystal molecule driving voltage, mainly be by with the bias line voltage difference of pairing data-signal same polarity, cause capacitance coupling effect and increase.In addition, the driving principle of frame N+1 is identical with the driving principle of frame N, repeats no more.In addition, the driving method of present embodiment also can be analogized with the row counter-rotating.
It should be noted that in the embodiment of the invention it is that increase with storage capacitors causes capacitance coupling effect, increase the driving voltage of liquid crystal molecule by this.The reference electrode of storage capacitors does not limit, and for example, another reference electrode of storage capacitors can be sweep trace, perhaps, constitutes storage capacitors by bias line and capacitance electrode, and this capacitance electrode can form in same technology with data line.In addition, same principle can be applicable to other electric capacity of dot structure.
More than; Embodiments of the invention are by setting up bias line, and control with corresponding bias line electrode, to produce the capacitance coupling effect of storage capacitors; And then the voltage difference of increase public electrode and pixel electrode; This voltage difference will be greater than making the required voltage of liquid crystal deflecting element to the special angle that interdicts backlight (P1), and for example, this voltage difference can be P2 or greater than the voltage of P2.According to present embodiment, inserting black picture interval 101, because the driving voltage of liquid crystal molecule increases; The velocity of rotation of liquid crystal molecule is along with increase; Can shorten and insert black picture interval 101,, can increase backlight and open interval 104 and promote display brightness for general LCD; For optical compensation curved LCD, can also reduce its critical voltage, make the reduction electrical source consumption save cost, make liquid crystal molecule be not easy to receive environment temperature or external factor, get back to the extension attitude, promoted the degree of stability and the fiduciary level of display.In addition, because the means that the present invention adopts not modulated data signal voltage and public electrode voltages, need not increase the voltage output range of source electrode driver, be able to save manufacturing cost.
Above-mentioned many embodiment are merely explanation technological thought of the present invention and characteristics; Its purpose makes the personage who is familiar with this skill can understand content of the present invention and is implementing according to this; When can not with qualification claim of the present invention; Be that all other do not break away from various equivalences that disclosed spirit accomplishes and change or modify in the scope that all is encompassed in the present invention and is disclosed, all should be included in the following claim scope.
Claims (10)
1. the driving method of a LCD; Be applied to LCD, said LCD comprises many data lines and many gate lines, and defines a plurality of pixels by this; Each said pixel comprises by pixel electrode and the formed liquid crystal capacitance of public electrode and by said pixel electrode and the formed storage capacitors of pairing bias line; Wherein, said bias line is positioned at said pixel electrode below, and said method comprises:
Give said public electrode and said bias line different voltages with different source respectively;
Write redness, green and blue picture and at least one black picture in each display frame; During said black picture inserts; Pixel electrode to first pixel writes first data-signal; And pairing first bias line of said first pixel write the first bias line voltage and said public electrode is write public electrode voltages;
Wherein, Said first data-signal has the first identical polarity with the said first bias line voltage; Said bias line voltage causes coupling effect; Make the public electrode of said first pixel and the voltage difference between the said pixel electrode reach first voltage difference, said first voltage difference is greater than the required voltage difference of liquid crystal deflecting element to the special angle that interdicts said backlight of layer of liquid crystal molecule in the liquid crystal capacitance that makes said first pixel.
2. driving method as claimed in claim 1, wherein said public electrode voltages has second polarity, and said second polarity is opposite with said first polarity.
3. driving method as claimed in claim 1, wherein said public electrode voltages are fixed voltage.
4. driving method as claimed in claim 1; The pixel electrode that also comprises second pixel writes second data-signal; And pairing second bias line of said second pixel write the second bias line voltage; Wherein said first bias line is independently of one another with said second bias line and be connected the different voltages with different source, and said second data-signal has the second identical polarity with the said second bias line voltage, and said second polarity is opposite with said first polarity.
5. driving method as claimed in claim 4, wherein said public electrode voltages are fixed voltage.
6. driving method as claimed in claim 4, wherein said second pixel be adjacent to first pixel, and said first bias line and said second bias line are parallel to said multi-strip scanning line respectively.
7. driving method as claimed in claim 1, wherein in same display frame, the polarity of said redness, green and blue picture and the said black picture that is shown in said first pixel is mutually the same.
8. driving method as claimed in claim 4, wherein in same display frame, said redness, green and the blue picture that is shown in said first pixel has identical said first polarity each other with said black picture; And the said redness, green and the blue picture that are shown in said second pixel and said black picture have mutually the same said second polarity.
9. driving method as claimed in claim 4, the polarity distribution of wherein said black picture are selected from frame and reverse, go and reverse, be listed as and reverse, put one of them of reversing.
10. driving method as claimed in claim 1, wherein said LCD are optical compensation curved LCD.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109324448A (en) * | 2018-11-13 | 2019-02-12 | 昆山龙腾光电有限公司 | Array substrate and liquid crystal display device |
| CN110349549A (en) * | 2019-07-17 | 2019-10-18 | 京东方科技集团股份有限公司 | Driving method, driving circuit and the display device of liquid crystal display panel |
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| CN109324448B (en) * | 2018-11-13 | 2021-12-14 | 昆山龙腾光电股份有限公司 | Array substrate and liquid crystal display device |
| CN110349549A (en) * | 2019-07-17 | 2019-10-18 | 京东方科技集团股份有限公司 | Driving method, driving circuit and the display device of liquid crystal display panel |
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