CN101046944A - Liquid crystal display device, driving control circuit and driving method used in same - Google Patents
Liquid crystal display device, driving control circuit and driving method used in same Download PDFInfo
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- CN101046944A CN101046944A CN 200710092174 CN200710092174A CN101046944A CN 101046944 A CN101046944 A CN 101046944A CN 200710092174 CN200710092174 CN 200710092174 CN 200710092174 A CN200710092174 A CN 200710092174A CN 101046944 A CN101046944 A CN 101046944A
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Abstract
A liquid crystal display device is provided which is capable of improving quality of moving images. A field dividing driving operation is performed in which an odd field during which each of scanning electrodes in odd-numbered rows is sequentially driven and an even field during which each of scanning electrodes in even-numbered rows is sequentially driven occur, alternately and repeatedly, with time width of a refresh rate. In the former half of the odd field, display data is written in each of pixel regions corresponding to scanning electrodes in odd-numbered rows and, in the latter half of the odd field, black data is written in each of the pixel regions corresponding to scanning electrodes in the odd-numbered rows. In the former half of the even field, display data is written in each of pixel regions corresponding to scanning electrodes in the even-numbered rows and, in the latter half of the even field, black data is written in each of pixel regions corresponding to scanning electrodes in the even-numbered rows.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and driving method, particularly be applicable to the liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and the driving method that show dynamic image.
The application requires the right of priority of Japanese patent application 2006-101252 that applied on March 31st, 2006 and the 2006-159001 that applied on June 7th, 2006, as reference it is applied at this.
Background technology
In recent years, liquid crystal indicator not only is used for the display of personal computer, also is used to multiple displays such as LCD TV.Under the situation that is used for TV etc., need the performance that shows dynamic image, yet in existing liquid crystal indicator, at the image that shows under the situation of dynamic image below when current images also remains in user's the consciousness, just showing, make the user feel image retention (trail, image blurring).Its reason is that the on-load voltage of liquid crystal produces to reply needs the time, and has adopted and can keep present frame to drive up to the maintenance of the shows signal of receiving the subsequent frame correspondence.
The hangover that is caused by the answer speed of liquid crystal applies superpotential replying of this liquid crystal of acceleration such as overdrive to liquid crystal and weakens by adopting.And maintenance drives the hangover that causes, for example CRT (Cathode Ray Tube, cathode-ray tube (CRT)) display device is such, only shows that by adopting the pulsed drive of moment image weakens.So-called pulsed drive is that for example a kind of black insertion driving method shows the black picture after the display image in an image duration on liquid crystal panel.And except that above-mentioned black insertion driving method, so-called pulsed drive can also be method (backlight flickering method) from predetermined voltage to pixel region that light backlight after applying.
Existing this liquid crystal indicator comprises: black drive control part 1, source electrode driver 2, gate drivers 3 and the display panels 4 of inserting constitutes.Display panels 4 has not shown fine scanning electrode, multi-column data electrode and a plurality of pixel region, by applying sweep signal OUT to this each scan electrode successively and applying corresponding video data D to this each data electrode, write corresponding video data D to this each pixel region, the light that not shown backlight is sent carries out the control corresponding with video data.The black drive control part 1 that inserts is exported control signal a based on input signal of video signal VD to source electrode driver 2, and to gate drivers 3 output control signal b.Source electrode driver 2 is based on the control signal a from black insertion drive control part 1, each data electrode to display panels 4 applies and imports the pairing voltage of the corresponding video data of signal of video signal VD (display data voltage), and then carrying out inserting grey level without exception to each image duration is for example black insertion driving of the black frame of " 0 ".Gate drivers 3 is based on from the black control signal b that inserts drive control part 1 sweep signal OUT being applied successively to each scanning electrode wire of display panels 4.
In this liquid crystal indicator, as shown in figure 19, each scan electrode of display panels 4 ( row 1,2 ..., 2N-1,2N) line in turn is driven, after the video data [1] corresponding with input signal of video signal VD writes corresponding pixel region, write black data, finish 1 frame.Afterwards, by video data [2], [3], [4] and black data, per 1 frame repeats identical work.Therefore, as shown in figure 20, become 2 times of frame rate for the driving frequency of display panels 4, each frequency of video data D, control signal a, control signal b and sweep signal OUT is compared multiplication with the situation of not deceiving the insertion driving, and then, insert situation about driving and compare and reduce by half with not deceiving to write time of liquid crystal panel and the holding time of liquid crystal panel.And the frequency of the reversal of poles of video data D also becomes 2 times, so the frequency of the control signal a among Figure 18 also doubles.
Except above-mentioned liquid crystal indicator, existing this technology also can be the technology of being put down in writing in the following document.For example, the patent documentation spy opens the TV that puts down in writing in the flat 04-044478 communique and uses in the driving method of liquid crystal indicator, as shown in figure 21, carry out by the scan electrode of liquid crystal panel ( row 1,2 ..., 2N-1,2N) in the driven successively odd field of scan electrode of odd-numbered line, and the formed driven of the driven successively even field of the scan electrode of even number line.These odd fields and even field are respectively according to the time-amplitude alternate repetition of refresh rate.Then, at preceding half of odd field, to each pixel region corresponding with the scan electrode of odd-numbered line write the video data corresponding with importing signal of video signal ([1], [3] ...), later half at this odd field writes black data simultaneously to each pixel region corresponding with whole scan electrode of odd-numbered line.And, even field preceding half to the pixel region corresponding with the scan electrode of even number line write the video data corresponding with importing signal of video signal ([2], [4] ...), write black data the later half of this even field simultaneously to the pixel region corresponding with whole scan electrode of even number line.
Yet, in the above-mentioned existing liquid crystal indicator, have following problem.That is, in the liquid crystal indicator of Figure 18, compare, have following problem:, produced the problem that the electric power of scale increase, consumption also increases because the multiplication of the frequency of operation of each several part needs its corresponding hardware configuration with not deceiving situation about insert driving.And, in this liquid crystal indicator, scanning electrode wire in turn is driven, as shown in figure 20, the polarity of voltage of the video data D of every row is inverted, and then, the pattern of this counter-rotating is in each refresh rate counter-rotating, therefore with the zone difference of liquid crystal panel, have the polarity of voltage deviation of video data, the problem of burn picture takes place.And, though drive the hangover that has improved animation by black the insertion, but, black demonstration and image occur alternately because showing with the human frequency band that can discern, the problem that the flickering that has increased picture is arranged, make the refresh rate high speed to the human frequency band that can not discern in order to suppress flickering, owing to driving the frequency of operation that doubles, black insertion to double once more, and very difficult on hardware configuration.
And, the patent documentation spy opens in the driving method of putting down in writing in the flat 04-044478 communique, owing to carry out driven, therefore the frequency of the work of each several part is very low, the later half of odd field each pixel region corresponding with all scan electrodes of odd-numbered line write black data simultaneously, and, the later half of even field each pixel region corresponding with all scan electrodes of even number line write black data simultaneously, the problem that luminance difference is arranged up and down of display frame can appear in the therefore holding time difference of the liquid crystal of every row.
Summary of the invention
The present invention makes because above situation is finished, its purpose is to provide a kind of liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and driving method with simple relatively formation, reduces the luminance difference in smear, burn, flicker, the display frame.
The invention of technical scheme 1 record is for providing a kind of liquid crystal indicator, drive the fine scanning electrode and the multi-column data electrode of mutual homeotropic alignment based on the input signal of video signal, pixel region to the liquid crystal layer correspondence writes predetermined video data, obtain display image, it is characterized in that, comprise: driving control unit, carry out a division driving, carry out field division driving for the above-mentioned input signal of video signal of every frame by the driven successively even field alternate repetition of above-mentioned scan electrode of driven successively odd field of the above-mentioned scan electrode of odd-numbered line and even number line, and, above-mentioned odd/even field and then constitute by first odd/even son and second odd/even field, at the above-mentioned first odd/even sub-field period, the video data line corresponding with above-mentioned input signal of video signal in turn writes each pixel region, at the above-mentioned second odd/even sub-field period, dark data line is in turn write each above-mentioned pixel region.
According to described liquid crystal indicator, it is characterized in that, the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each above-mentioned even field.
And above-mentioned dark data are black data.
And, according to technical scheme 1 described liquid crystal indicator, it is characterized in that, in above-mentioned odd field in driven successively while of each above-mentioned scan electrode of odd-numbered line, each scan electrode of the Next even number line of the above-mentioned scan electrode of each of above-mentioned odd-numbered line is driven, in driven successively while of each above-mentioned scan electrode of even number line, each described scan electrode of the odd-numbered line before the above-mentioned scan electrode of each of above-mentioned even number line is driven successively in above-mentioned even field.
Second mode of the present invention provides a kind of Drive and Control Circuit, be used for driving the fine scanning electrode and the multi-column data electrode of mutual homeotropic alignment based on the input signal of video signal, write the liquid crystal indicator that predetermined video data obtains display image to the pixel region corresponding with liquid crystal layer, carry out field division driving for the above-mentioned input signal of video signal of every frame by the driven successively even field alternate repetition of above-mentioned scan electrode of driven successively odd field of the above-mentioned scan electrode of odd-numbered line and even number line, and, above-mentioned odd/even field and then constitute by first odd/even son and second odd/even field, at the above-mentioned first odd/even sub-field period, the video data line corresponding with above-mentioned input signal of video signal in turn writes above-mentioned pixel region, at the above-mentioned second odd/even sub-field period, dark data line is in turn write above-mentioned pixel region.
According to described Drive and Control Circuit, it is characterized in that, the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each above-mentioned odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each above-mentioned even field.
And above-mentioned dark data are black data.
And, in above-mentioned odd field in driven successively while of each above-mentioned scan electrode of odd-numbered line, the above-mentioned scan electrode of each of the Next even number line of each scan electrode of above-mentioned odd-numbered line is driven successively, in driven successively while of each above-mentioned scan electrode of even number line, each described scan electrode of the odd-numbered line before each scan electrode of above-mentioned even number line is driven successively in above-mentioned even field.
Third Way of the present invention provides a kind of driving method, be used for driving the fine scanning electrode and the multi-column data electrode of mutual homeotropic alignment based on the input signal of video signal, write the liquid crystal indicator that predetermined video data obtains display image to the pixel region corresponding with liquid crystal layer, carry out field division driving for the above-mentioned input signal of video signal of every frame by the driven successively even field alternate repetition of above-mentioned scan electrode of driven successively odd field of the above-mentioned scan electrode of odd-numbered line and even number line, and, above-mentioned odd/even field and then constitute by first odd/even son and second odd/even field, at the above-mentioned first odd/even sub-field period, the video data line corresponding with above-mentioned input signal of video signal in turn writes above-mentioned pixel region, at the above-mentioned second odd/even sub-field period, dark data line is write above-mentioned pixel region successively.
According to described driving method, it is characterized in that, the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each even field.
And above-mentioned dark data are black data.
And, in above-mentioned odd field in driven successively while of each above-mentioned scan electrode of odd-numbered line, the above-mentioned scan electrode of each of the Next even number line of each scan electrode of above-mentioned odd-numbered line is driven successively, in driven successively while of each above-mentioned scan electrode of even number line, each above-mentioned scan electrode of the odd-numbered line before each scan electrode of above-mentioned even number line is driven successively in above-mentioned even field.
According to formation of the present invention, carry out the field division driving of odd field and even field alternate repetition, this odd/even and then constitute by first odd/even and second odd/even field, at this first odd/even sub-field period, to import the corresponding video data of signal of video signal with this in turn writes to each pixel region line, at this second odd/even sub-field period, in turn write dark data to this each pixel region line, thereby can make the frequency halving of the signal of each several part.Thus, when if the frequency of switching with the odd/even field is frame rate, the multiplication that existing black insertion drives the frequency that causes can be cancelled out each other with the frequency halving effect that driving of the present invention causes, therefore a kind of not black frequency multiplication that drives the each several part work that causes that inserts just can be provided, reduce animation fuzzy liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and driving method.And, when if the frequency of switching with the odd/even field is the frequency of multiple of frame rate, the multiplication of the frequency that the high speed of frame rate causes can be cancelled out each other with the frequency halving effect that driving of the present invention causes, therefore to drive the frequency of operation of identical each several part with existing black insertion, black show and the sudden strain of a muscle of the image demonstration frequency of going out can double, therefore can provide a kind of liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and driving method, it is fuzzy to reduce animation, and gets rid of the black flickering that causes that inserts.And, identical with the holding time of video data in the corresponding pixel region of each scan electrode and dark data, the therefore situation that produces luminance difference up and down that can avoid display frame.
And, because the polarity of voltage of the data that write to each pixel region corresponding with the scan electrode of odd-numbered line is in each odd field counter-rotating, and the polarity of voltage of the data that write to the pixel region corresponding with the scan electrode of even number line is inverted at each even field, therefore different according to the zone of liquid crystal panel, the deviation of the polarity of voltage of video data reduces, and can reduce the burn of picture.And, thus, if when being frame rate with the frequency of the switching of odd/even field, the black data holding time as dark data is elongated, even therefore the picture transverse electric field drives (IPS, In-P1ane Switching) the type liquid crystal is like that because of from complete slow to complete black answer speed in vain, and the liquid crystal panel that the black effect of inserting is difficult to give full play to also can easily be realized the black driving of inserting.And, in odd field, in driven successively while of the above-mentioned scan electrode of odd-numbered line, each scan electrode of the Next even number line of each scan electrode of above-mentioned odd-numbered line is driven successively, in even field, in driven successively while of the above-mentioned scan electrode of even number line, each scan electrode of the odd-numbered line before each scan electrode of above-mentioned even number line is driven successively, can improve the luminance efficiency of above-mentioned liquid crystal indicator.
Description of drawings
Fig. 1 is the block diagram of expression as the electrical structure of the major part of the liquid crystal indicator of the first embodiment of the present invention.
Fig. 2 is the synoptic diagram of an example of the electrical structure of the display panels 14 in the presentation graphs 1.
Fig. 3 is the figure of the position of the concise and to the point structure of the display panels 14 in the presentation graphs 1 and backlight 15.
Fig. 4 is the sequential chart of action of the liquid crystal indicator of key diagram 1.
Fig. 5 is the figure of the counter-rotating of the data voltage polarity that writes of each pixel region in Fig. 2 of explanation.
Fig. 6 is the oscillogram of each several part of action of the liquid crystal indicator of key diagram 1.
Fig. 7 is the figure of other examples of the counter-rotating of the data voltage polarity that writes of each pixel region in Fig. 2 of explanation.
Fig. 8 is the figure of other examples of the counter-rotating of the data voltage polarity that writes of each pixel region in Fig. 2 of explanation.
Fig. 9 is the figure of other examples of the counter-rotating of the data voltage polarity that writes of each pixel region in Fig. 2 of explanation.
Figure 10 is the figure of example of the deviation of the data voltage polarity that writes of each pixel region in Fig. 2 of explanation.
Figure 11 is the sequential chart of explanation as the liquid crystal indicator action of the second embodiment of the present invention.
Figure 12 is the figure that the counter-rotating of the data voltage polarity that writes to each pixel region among second embodiment is described.
Figure 13 is the oscillogram of each one of action of the liquid crystal indicator of explanation second embodiment.
Figure 14 is the figure of other examples of the counter-rotating of the data voltage polarity that writes to pixel region among explanation second embodiment.
Figure 15 is the figure of other examples of the counter-rotating of the data voltage polarity that writes to pixel region among explanation second embodiment.
Figure 16 is the figure of other examples of the counter-rotating of the data voltage polarity that writes to pixel region among explanation second embodiment.
Figure 17 is the sequential chart of variation of the action of explanation liquid crystal indicator.
Figure 18 is the figure of electrical structure of the major part of expression available liquid crystal display device.
Figure 19 is the sequential chart of the liquid crystal indicator of explanation Figure 18.
Figure 20 is the sequential chart of the liquid crystal indicator of explanation Figure 18.
Figure 21 is the oscillogram that each one of the action that has other liquid crystal indicators now is described.
Embodiment
By the reference the description of the drawings, structure of the present invention, advantage and feature will be clearer and more definite.
Be described in detail below and implement most preferred embodiment of the present invention.A kind of liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and driving method are provided, by field division driving and black combination of inserting driving, the reducing by half of signal frequency of the each several part that is caused by a black multiplication of inserting the signal frequency that drives the each several part that causes and a division driving cancelled out each other, frequency multiplication that need not each several part and to reduce animation fuzzy.And, a kind of liquid crystal indicator, the employed Drive and Control Circuit of this liquid crystal indicator and driving method are provided, by field division driving and black combination of inserting driving, the increase of the signal frequency of the each several part that is caused by the increase of frame rate is cancelled out each other with the reducing by half of signal frequency of the each several part that a division driving causes, it is fuzzy to reduce animation, and black insertion of other and elimination drives the flicker that causes.
Fig. 1 is the block diagram of expression as the electrical structure of the major part of the liquid crystal indicator of the first embodiment of the present invention.Liquid crystal indicator in this example as shown in Figure 1, comprises time schedule controller 11, source electrode driver 12, gate drivers 13, display panels 14 and backlight 15.
Fig. 2 is the synoptic diagram of an example of the electrical structure of the display panels 14 in the presentation graphs 1.This display panels 14 is the permeation type liquid crystal panel that makes the light incident of backlight, as shown in Figure 2, by multi-column data electrode Xi (i=1,2 ..., m, for example, m=640 * 3), with the fine scanning electrode Yj of this data electrode Xi homeotropic alignment (j=1,2 ..., n, for example, n=480) and pixel region 20i, j constitute.Each data electrode Xi is provided at predetermined intervals in the x direction, applies corresponding video data Di.Scan electrode Yj is provided at predetermined intervals in the y direction vertical with the x direction, applies and writes the sweep signal OUTj that video data Di uses.Each pixel region 20i, j and the corresponding one to one setting in the intersection region of data electrode Xi and scan electrode Yj are made of TFT (Thin Film Transistor, thin film transistor (TFT)) 21i, j, each liquid crystal cells 22i, j and common electrode COM.TFT21i, j apply video data Di to liquid crystal cells 22i, j based on its conduction and cut-off of sweep signal OUTj Be Controlled during for conducting state.
At this display panels 14, each scan electrode Yj and data electrode Xi are driven, promptly, to each scan electrode Yj each sweep signal OUTj is applied according to the order corresponding with driven, and write corresponding video data Di to each data electrode Xi, the video data that writes predetermined voltage to the pixel region 20i corresponding, j thus with this video data Di, constitute the directed state of liquid crystal of the liquid crystal layer of this display panels 14 based on this Control of Voltage, thereby change the transmitance of light, obtain display image.Source electrode driver 12 applies video data Di in the lump based on the control signal a from time schedule controller 11 on each data electrode Xi of display panels 14.Grid controller 13 is based on the control signal b from time schedule controller 11, and sweep signal OUTj is applied according to the order of corresponding fields division driving to each scan electrode Yj of display panels 14.
Fig. 3 is the figure of the position of the concise and to the point structure of the display panels 14 in the presentation graphs 1 and backlight 15.This display panels 14 as shown in Figure 3, by a pair of Polarizer 31,32, relatively substrate 33, active matrix substrate 34 and constitute between the liquid crystal layer between these 35.Substrate 33 is provided with the common electrode COM among Fig. 2 relatively, and is formed with the color filter 36 of R (red), G (green), B (indigo plant).3 pixels with R, G, B constitute a bit.Active matrix substrate 34 is provided with the elements such as TFT21i, j among Fig. 2.Backlight 15 is disposed at the rear side of display panels, and as area source, integral body forms the size roughly the same with the display frame of display panels 14 as the light of LED (Light Emitting Diode, light emitting diode).
In this display panels 14, the white light of backlight 15 incides liquid crystal layer 35 by becoming linear polarization after the Polarizer 32.Liquid crystal layer 35 by, for example, transverse electric field drives (IPS, In-Plane Switching) the type liquid crystal constitutes, it has and changes the axial action of polarisation, and this action is by the directed State Control of liquid crystal, therefore the direction by the Control of Voltage polarizing axis corresponding with video data Di.The direction decision outgoing of the polarizing axis of liquid crystal layer 35 outgoing is not from then on only absorbed by Polarizer 32.Like this, the transmitance by the Control of Voltage light corresponding with video data Di.And the light by each pixel adds the mixture of colours by R, G, the B of light filter 36, obtains coloured image.
And then, drive control part 11c will be to the polarity of voltage of the pixel region 20i corresponding with the scan electrode Yj of odd-numbered line, data that j writes in each odd field counter-rotating, and, will be to the polarity of voltage of the pixel region 20i corresponding, data that j writes in each even field counter-rotating with the scan electrode Yj of even number line.And backlight 15 is driven by not shown backlight driving circuit based on the not shown control signal from time schedule controller 11.And above-mentioned time schedule controller 11, source electrode controller 12 and grid controller 13 constitute Drive and Control Circuit.In addition, the frame rate of input signal of video signal VD is 60.00Hz in the specification of display panels 14 during for for example XGA (ExtendedGraphics Array), when VGA (Video Graphics Array) is 59.94Hz, is 60.32Hz when SVGA (Super Video Graphics Array).
Fig. 4 is the sequential chart of action of the liquid crystal indicator of key diagram 1, the figure of the counter-rotating of the data voltage polarity that Fig. 5 is the pixel region 20i of explanation in Fig. 2, j writes, and Fig. 6 is the oscillogram of each several part of action of the liquid crystal indicator of key diagram 1.In this liquid crystal indicator, by drive control part 11c, carry out the field division driving of the driven successively even field alternate repetition of scan electrode Yj of the driven successively odd field of scan electrode Yj of odd-numbered line and even number line, constitute a frame successively corresponding to input signal of video signal VD.In the case, thereafter, in preceding half (the first odd number sub-field period) of odd field, after each pixel region 20i, the j line corresponding with each scan electrode Yj of odd-numbered line in turn write the video data corresponding with importing signal of video signal VD, in later half (the second odd number sub-field period) of this odd field, in turn write black data to each pixel region 20i, the j line of each scan electrode Yj correspondence of odd-numbered line.Then, in preceding half (the first even number sub-field period) of even field, in turn write the video data corresponding to each pixel region 20i, the j line corresponding with importing signal of video signal VD with each scan electrode Yj of even number line, and in later half (the second even number sub-field period) of this even field, in turn write black data to each pixel region 20i, the j line corresponding with each scan electrode Yj of even number line.
In addition, in the present embodiment, signal of video signal VD is based on constituting with the corresponding specification of driven in input, have respectively with odd field and even field corresponding during.And, by drive control part 11c, polarity of voltage to the data that write with the corresponding pixel region 20i of the scan electrode Yj of odd-numbered line, j is inverted at each odd field, and, the polarity of voltage of the data that write with the corresponding pixel region 20i of the scan electrode Yj of even number line, j is inverted at each even field.
Promptly, as shown in Figure 4, in this embodiment, carry out display panels 14 scan electrode ( row 1,2 ..., 2N-1,2N) in the driven successively odd field of scan electrode of odd-numbered line and the field division driving that constitutes of the driven successively even number of the scan electrode place of even number line.Above-mentioned odd field and even field carry out alternately repeatedly with frame rate respectively.And, preceding half (the first odd number sub-field period) at odd field, will with input signal of video signal VD corresponding video data ([1], [3] ...) line in turn write with corresponding each pixel region of the scan electrode of odd-numbered line in, at later half (the second odd number sub-field period) of this odd field, in turn writing black data with corresponding each the pixel region center line of the scan electrode of odd-numbered line.And, preceding half (the first even number sub-field period) at even field, will with input signal of video signal VD corresponding video data ([2], [4] ...) line in turn write with corresponding each pixel region of the scan electrode of even number line in, at later half (the second even number sub-field period) of this even field, in turn writing black data with corresponding each the pixel region center line of the scan electrode of even number line.
And, the polarity of voltage of the data that each pixel region 20i, j are write is for example shown in Fig. 5 (a), at preceding half of odd field, to the polar mode shown in Fig. 5 (h), polarity of voltage with the corresponding pixel region 20i of scan electrode (odd-numbered line) of odd-numbered line, video data [1] that j writes is inverted, thereafter shown in Fig. 5 (b), later half at odd field writes to half polarity black data before keeping.And, shown in Fig. 5 (e), at preceding half of even field, to the polar mode shown in Fig. 5 (b), polarity of voltage with the corresponding pixel region 20i of scan electrode (even number line) of even number line, video data [2] that j writes is inverted, thereafter shown in Fig. 5 (d), later half at even field writes to half polarity black data before keeping.
And, shown in Fig. 5 (e), at preceding half of odd field, to the polar mode shown in Fig. 5 (d), polarity of voltage with the corresponding pixel region 20i of scan electrode (odd-numbered line) of odd-numbered line, video data [3] that j writes is inverted, thereafter shown in Fig. 5 (f), later half at odd field writes black data with keeping before the odd field half polarity.And, shown in Fig. 5 (g), at preceding half of even field, to the polar mode shown in Fig. 5 (f), polarity of voltage with the corresponding pixel region 20i of scan electrode (even number line) of even number line, video data [4] that j writes is inverted, thereafter shown in Fig. 5 (h), later half at even field writes black data with keeping before the even field half polarity.
Therefore, as shown in Figure 6, the frequency halving effect that the frequency multiplication of the frequency of the video data that black insertion causes and driving of the present invention cause offsets.Therefore, for example, if the switching frequency of odd/even field is made as the frame rate of input signal of video signal VD, each frequency of this video data Di, control signal a and sweep signal OUTj with do not deceive insert when driving identical, to the respiratory time of liquid crystal panel also with do not deceive insert when driving identical, therefore, the frequency that is inverted of the polarity of the voltage of video data Di with do not deceive insert when driving identical.And, for control signal b, for gate drivers 13, making the gate drivers clock is 2 of every row, and utilize the gate drivers conducting to enable, only export and the corresponding grid voltage of odd-numbered line, and only export the grid voltage corresponding with even number line at even field at odd field, thus, can export and a corresponding sweep signal OUTj of division driving.
As mentioned above, in first embodiment, by drive control part 11c, carry out the mutual field division driving repeatedly of odd field and even field, at preceding half of this odd field, the video data line is in turn write corresponding each pixel region 20i with the scan electrode Yj of odd-numbered line, among the j, and later half at this odd field, with corresponding each the pixel region 20i of the scan electrode Yj of odd-numbered line, the j center line in turn writes black data, and, at preceding half of even field, the video data line is in turn write corresponding each pixel region 20i with the scan electrode Yj of even number line, among the j, and later half at this even field, with corresponding each the pixel region 20i of the scan electrode Yj of even number line, the j center line in turn writes black data.Therefore, for example, if establishing the switching frequency of odd/even field is frame rate, the frequency halving effect that frequency multiplication that black insertion driving in the past causes and driving of the present invention cause offsets, therefore can provide a kind of liquid crystal indicator, the employed Drive and Control Circuit of liquid crystal indicator and driving method, can not produce the black frequency multiplication that inserts the action that drives each one that causes, it is fuzzy to reduce animation.And because the video data of each row and the holding time of black data become equal, so display frame can not produce luminance difference up and down.
In addition, the burn reversal of poles of usefulness of the preventing of the liquid crystal panel of liquid crystal drive mode of the present invention drives except above-mentioned Fig. 5, also comprises Fig. 7, Fig. 8 and method shown in Figure 9.Owing to all be that polarity of voltage to the data that write with the corresponding pixel region 20i of the scan electrode Yj of odd-numbered line, j is inverted at each odd field, and the polarity of voltage to the data that write with the corresponding pixel region 20i of the scan electrode Yj of even number line, j is inverted at each even field, therefore the video data Di polarity of voltage in the zone of liquid crystal panel can not produce deviation, can prevent the burn of above-mentioned picture.For example, shown in Figure 10 (a) and (b), (c), (d), the polarity of voltage of the data that write with the scan electrode Yj of odd-numbered line corresponding each pixel region 20i, j is not inverted at each odd field, and to the polarity of voltage of the data that write with the scan electrode Yj of even number line corresponding each pixel region 20i, j in the method that each even field is not inverted, on liquid crystal panel, video data Di voltage polarity produce deviation, for example in the demonstration of complete white picture shown in Figure 10, owing to produce the burn of whole image, therefore should avoid.And, because the holding time of the black data of the dark data of conduct is elongated, therefore, the type liquid crystal like this for type electric field driven (IPS, In-Plane Switching) sidelong, from complete slower to complete black answer speed in vain, even therefore be difficult to give full play to the black liquid crystal panel that inserts effect, can realize easily that also black the insertion drives.
Figure 11 is the sequential chart of explanation as the action of the liquid crystal indicator of the second embodiment of the present invention.Figure 12 is the figure that the polarity of voltage of the data that write each pixel region of explanation second embodiment reverses, Figure 13 is the oscillogram of each several part of action of each liquid crystal indicator of explanation second embodiment, and Figure 14 is the figure of other examples of the polarity of voltage counter-rotating that writes data that writes pixel region of second embodiment.Figure 15 is the figure of other examples of the polarity of voltage counter-rotating that writes data that writes pixel region of second embodiment.Figure 16 is the figure of other examples of the polarity of voltage counter-rotating that writes data that writes pixel region of second embodiment.With reference to above-mentioned figure, the contents processing of the employed driving method of liquid crystal indicator in this example is described.In this liquid crystal indicator of second embodiment, as shown in figure 11, preceding half (the first odd number sub-field period) at odd field, with the input the corresponding video data of signal of video signal VD ([1], [3],) line in turn be written into corresponding each pixel region of the scan electrode of odd-numbered line in the time, with corresponding each pixel region of each scan electrode of the next line (being even number line) of each scan electrode of this odd-numbered line in also line in turn write this video data ([1], [3],), at later half (the second odd number sub-field period) of this odd field, in turn writing black data with the corresponding pixel region center line of the scan electrode of odd-numbered line and even number line.
And, preceding half (the first even number sub-field period) at even field, with the input the corresponding video data of signal of video signal VD ([2], [4],) line in turn be written into corresponding each pixel region of the scan electrode of even number line in the time, with corresponding each pixel region of each scan electrode of the previous row (being odd-numbered line) of each scan electrode of this even number line in also line in turn write this video data ([2], [4],), at later half (the second even number sub-field period) of this even field, in turn writing black data with corresponding each the pixel region center line of the scan electrode of even number line and odd-numbered line.Thus, each frequency of video data Di, control signal a and sweep signal OUTj and the write time of liquid crystal are identical with first embodiment, improve the luminance efficiency of liquid crystal indicator.In this case, the polarity of voltage of the data that each pixel region 20i, j are write is inverted in per two odd fields and per two even fields to the polarity of voltage with the corresponding pixel region 20i of scan electrode Yj, j+1 of per two row odd-numbered lines and per two row even number lines, data that j+1 writes for example as shown in figure 12.And, the waveform of each one as shown in figure 13, in odd field, the signal identical with odd-numbered line also is written into even number line simultaneously, in even field, the signal identical with even number line also is written into odd-numbered line simultaneously.Other guide is identical with Fig. 6.
In addition, shown in Figure 14 (a) and (b), (c), (d), in the method that the polarity of voltage with per two row odd-numbered lines and the corresponding pixel region 20i of scan electrode Yj, j+1 of per two row even number lines, data that j+1 writes is inverted in every odd field and even field, as shown in figure 15, for example, during with odd number behavior border image switching, the boundary line that picture switches only writes image data voltage at odd field.That is, in this case, produce and write the only voltage of the image data of identical polar, when therefore this state continues for a long time, on the handoff boundary line of picture, produce burn, therefore not preferred.On the other hand, the reversal of poles of representing among above-mentioned Figure 12 is shown in Figure 16 (j), even when the state of odd-numbered line picture switching continues for a long time, by in per two odd fields and per two even fields, being inverted with per two row odd-numbered lines and the corresponding pixel region 20i of scan electrode Yj, j+1 of per two row even number lines, the polarity of voltage of data that j+1 writes, even on the handoff boundary line of picture, the polarity of voltage of video data Di can not produce deviation yet, can not produce burn.
Figure 17 is the sequential chart of explanation as the action of the liquid crystal indicator of the 3rd embodiment of this invention.The foregoing description 1 is that the frequency with half of common black insertion is driven, but in embodiment 3, under the doubly speed of liquid crystal panel and each circuit drives to possible situation, 1 frame is divided into 4 fields, when the switching frequency of odd/even field being made as the frequency more than the twice of frame rate, a kind of liquid crystal indicator can be provided, Drive and Control Circuit that this liquid crystal indicator is used and driving method, the frequency halving effect that the frequency multiplication that the high speed of frame rate causes and the driving of this invention cause offsets, therefore to drive the frequency of operation of each identical one with existing black insertion, multiplication is black to be shown and the sudden strain of a muscle of the image demonstration frequency of going out, therefore animation is fuzzy is minimized, and gets rid of the black flickering that causes that inserts.In addition, Figure 17 is the method with the frame rate high speed of embodiment 1, similarly, will can obtain identical effect behind embodiment 2 high speeds.
Above basis describes this inventive embodiment in detail, but concrete structure is not limited to this embodiment, and the change of the design in the scope that does not break away from thought of the present invention etc. all comprises in the present invention.For example, no matter importing signal of video signal VD is driven or progressive driving, changes this input signal of video signal VD by utilizing time schedule controller 11, can obtain effect and the effect identical with the foregoing description 1, embodiment 2 and embodiment 3.And the gate drivers 13 among above-mentioned Fig. 1 also can constitute to be divided into to each scan electrode Yj of the odd-numbered line of display panels 14 and apply the part of sweep signal OUTj and apply the part of sweep signal OUTj to each scan electrode Yj of even number line.In this case, time schedule controller 11 also needs to be set as and the corresponding structure of this structure.And the display panels 14 among Fig. 1 is not limited to the structure of Fig. 2 and Fig. 3, for example also can use the liquid crystal panel of TN (Twisted Nematic) type liquid crystal and VA (VerticalAlignment) type liquid crystal.
And in the above-described embodiments, black data uses as dark data, but is not limited to black data, even have the data of the gray scale similar to black data, also can obtain effect and the effect roughly the same with the foregoing description.And the polarity of voltage of the data that pixel region is write is not limited to polarity shown in Figure 5.And shown in the sequential chart of Fig. 6 and Figure 13, the waveform of video data Di and display panels 14 are that the situation of normal black (Normally black) type is corresponding, but also can be Chang Bai (Normally white) type liquid crystal panels.
The present invention goes for the LCD that LCD TV, animation display use etc., shows the liquid crystal indicator of dynamic image.
Claims (15)
1. liquid crystal indicator drives the fine scanning electrode and the multi-column data electrode of mutual homeotropic alignment based on the input signal of video signal, writes predetermined video data to the pixel region of liquid crystal layer correspondence, obtains display image, it is characterized in that, comprising:
Drive and Control Circuit, carry out a division driving, carry out field division driving for the above-mentioned input signal of video signal of every frame by the driven successively even field alternate repetition of above-mentioned scan electrode of driven successively odd field of the above-mentioned scan electrode of odd-numbered line and even number line, and, above-mentioned odd/even field and then constitute by first odd/even son and second odd/even field, at the above-mentioned first odd/even sub-field period, the video data line corresponding with above-mentioned input signal of video signal in turn writes each pixel region, at the above-mentioned second odd/even sub-field period, dark data line is in turn write each above-mentioned pixel region.
2. liquid crystal indicator according to claim 1 is characterized in that,
The polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each above-mentioned even field.
3. liquid crystal indicator according to claim 1 is characterized in that,
Above-mentioned dark data are black data.
4. liquid crystal indicator according to claim 1 is characterized in that,
In driven successively while of each above-mentioned scan electrode of odd-numbered line, each scan electrode of the Next even number line of the above-mentioned scan electrode of each of above-mentioned odd-numbered line is driven in above-mentioned odd field,
In driven successively while of each above-mentioned scan electrode of even number line, each described scan electrode of the odd-numbered line before the above-mentioned scan electrode of each of above-mentioned even number line is driven successively in above-mentioned even field.
5. liquid crystal indicator according to claim 2 is characterized in that,
In driven successively while of each above-mentioned scan electrode of odd-numbered line, each scan electrode of the Next even number line of the above-mentioned scan electrode of each of above-mentioned odd-numbered line is driven in above-mentioned odd field,
In driven successively while of each above-mentioned scan electrode of even number line, each described scan electrode of the odd-numbered line before the above-mentioned scan electrode of each of above-mentioned even number line is driven successively in above-mentioned even field.
6. a Drive and Control Circuit is used for writing the liquid crystal indicator that predetermined video data obtains display image based on importing fine scanning electrode and the multi-column data electrode that signal of video signal drives mutual homeotropic alignment to the pixel region corresponding with liquid crystal layer,
Carry out field division driving for the above-mentioned input signal of video signal of every frame by the driven successively even field alternate repetition of above-mentioned scan electrode of driven successively odd field of the above-mentioned scan electrode of odd-numbered line and even number line, and, above-mentioned odd/even field and then constitute by first odd/even son and second odd/even field, at the above-mentioned first odd/even sub-field period, the video data line corresponding with above-mentioned input signal of video signal in turn writes above-mentioned pixel region, at the above-mentioned second odd/even sub-field period, dark data line is in turn write above-mentioned pixel region.
7. Drive and Control Circuit according to claim 6 is characterized in that,
The polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each above-mentioned odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each above-mentioned even field.
8. Drive and Control Circuit according to claim 6 is characterized in that,
Above-mentioned dark data are black data.
9. Drive and Control Circuit according to claim 6 is characterized in that,
In driven successively while of each above-mentioned scan electrode of odd-numbered line, the above-mentioned scan electrode of each of the Next even number line of each scan electrode of above-mentioned odd-numbered line is driven successively in above-mentioned odd field,
In driven successively while of each above-mentioned scan electrode of even number line, each described scan electrode of the odd-numbered line before each scan electrode of above-mentioned even number line is driven successively in above-mentioned even field.
10. Drive and Control Circuit according to claim 7 is characterized in that,
In driven successively while of each above-mentioned scan electrode of odd-numbered line, the above-mentioned scan electrode of each of the Next even number line of each scan electrode of above-mentioned odd-numbered line is driven successively in above-mentioned odd field,
In driven successively while of each above-mentioned scan electrode of even number line, each described scan electrode of the odd-numbered line before each scan electrode of above-mentioned even number line is driven successively in above-mentioned even field.
11. a driving method is used for writing the liquid crystal indicator that predetermined video data obtains display image based on importing fine scanning electrode and the multi-column data electrode that signal of video signal drives mutual homeotropic alignment to the pixel region corresponding with liquid crystal layer,
Carry out field division driving for the above-mentioned input signal of video signal of every frame by the driven successively even field alternate repetition of above-mentioned scan electrode of driven successively odd field of the above-mentioned scan electrode of odd-numbered line and even number line, and, above-mentioned odd/even field and then constitute by first odd/even son and second odd/even field, at the above-mentioned first odd/even sub-field period, the video data line corresponding with above-mentioned input signal of video signal in turn writes above-mentioned pixel region, at the above-mentioned second odd/even sub-field period, dark data line is write above-mentioned pixel region successively.
12. driving method according to claim 11 is characterized in that,
The polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each even field.
13. driving method according to claim 11 is characterized in that,
Above-mentioned dark data are black data.
14. driving method according to claim 11 is characterized in that,
In driven successively while of each above-mentioned scan electrode of odd-numbered line, the above-mentioned scan electrode of each of the Next even number line of each scan electrode of above-mentioned odd-numbered line is driven successively in above-mentioned odd field,
In driven successively while of each above-mentioned scan electrode of even number line, each above-mentioned scan electrode of the odd-numbered line before each scan electrode of above-mentioned even number line is driven successively in above-mentioned even field.
15. driving method according to claim 12 is characterized in that,
The polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of odd-numbered line is inverted at each odd field, and the polarity of voltage of the data that write to each pixel region corresponding with the above-mentioned scan electrode of even number line is inverted at each even field.
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