CN101620841A - Display panel driving method and display apparatus - Google Patents

Display panel driving method and display apparatus Download PDF

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Publication number
CN101620841A
CN101620841A CN200910139662A CN200910139662A CN101620841A CN 101620841 A CN101620841 A CN 101620841A CN 200910139662 A CN200910139662 A CN 200910139662A CN 200910139662 A CN200910139662 A CN 200910139662A CN 101620841 A CN101620841 A CN 101620841A
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color
data
sweep trace
display unit
data line
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桥本义春
大谷圭吾
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NEC Electronics Corp
NEC Corp
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NEC Corp
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Abstract

A method of driving a display panel is provided. The display panel includes a first scan group including first to third scan lines, and a plurality of data lines which intersect the first to third scan lines, and first display cells of a first color which are connected with the first scan line, second display cells of a second color which are connected with the second scan line, third display cells of a third color which are connected with the third scan line. The method is achieved by precharging the data lines to a predetermined voltage in a first horizontal period; and by supplying a data signal to the first to third display cells through the data lines driving of the first to third display cells after the data lines are precharged in the first horizontal period. In the driving of the first to third display cells, one of the first to third display cells corresponding to one of said first to third colors, having a maximum spectral luminous efficacy, is first driven.

Description

Displaying panel driving method and display device
Technical field
The present invention relates to be used to drive the method for display panel, and display device, and more specifically, relate to the technology that the color array of display unit wherein is in the display panel of horizontal stripe pattern that drives.
Background technology
Wherein to be aligned to the matrix type display panels of matrix be one of most typical display device to liquid crystal cells (cell).Display panels is provided with liquid crystal cells, sweep trace, and each in the sweep trace is selected the row of liquid crystal cells, and data line, provides data-signal by data line.Liquid crystal cells is arranged at the intersection location place of sweep trace and data line.Liquid crystal cells comprises TFT (thin film transistor (TFT)) and pixel electrode, and at pixel electrode with towards filling liquid crystal between its public electrode.
For the deterioration of control liquid crystal material when driving display panels, every scheduled time slot counter-rotating is provided to the polarity of the data-signal of pixel electrode.Reverse system comprises frame inversion driving, row inversion driving, line inversion driving, some inversion driving or the like.In the middle of these, the some inversion driving method be that driving data lines makes the polarity of voltage of neighbor differ from one another, and by it outstanding picture quality and by known.Usually, in an inversion driving, in order to reduce the current consumption of data-signal, all data lines by short circuit with in and be stored in electric charge in the data line before the polarity of inverted data signal.This has the effect identical with precharge, and because all data lines become almost the voltage near public electrode, so all pixels are not subjected to the influence of the signal level of the data-signal of output just before short circuit.
Usually, a pixel of display panels comprises three liquid crystal cells,, is used to show the liquid crystal cells of red (R), the liquid crystal cells that is used to show the liquid crystal cells of green (G) and is used for showing blue (B) that is.The most typically, the liquid crystal cells of demonstration same color is connected to same data line.Under these circumstances, the colored filter that provides for display panels becomes the vertical bar pattern.Corresponding to WXGA (the widescreen XGA (Extended Graphics Array): under the situation of display panels 1280 * 768 pixels), if colored filter belongs to the vertical bar type, so the number of data line be 3840 and the number of sweep trace be 768.
In liquid crystal indicator in recent years, the colored filter of red (R), green (G) and blue (B) can be aligned to horizontal stripe pattern and (for example, see also Japanese publication open (JP-A-Heisei 9-80466: prior art 1)).In this case, be used to show that the liquid crystal cells of same color is connected to same sweep trace.The advantage of the arrangement colored filter of horizontal bar type is that the number of data line becomes 1/3 and can reduce the number of data driver IC.For the minimizing of cost, the minimizing of the number of data driver IC is wanted.For example, because the number of data line is 1280 in corresponding to the display panels of WXGA, so be necessary to install the data driver IC of 1280 outputs.
Yet when adopting horizontal bar to arrange, the number of sweep trace increases by three times and scanning period and shortens 1/3 of scanning period that about vertical bar arranges.Therefore, a lot of problems appear.A problem is a colorrendering quality.When adopting horizontal bar to arrange, so because short row inversion driving that adopts under many circumstances of scanning period.Here, in the row inversion driving, the polarity difference of data-signal between adjacent data line, and the polarity of every frame period inverted data signal.Yet the row inversion driving is subjected to the influence of earlier data signal easily, and colorrendering quality is by deterioration.For example, when green raster figure will be shown, the liquid crystal cells of red (R) and blue (B) is provided with data-signal V0 so that the optical transmission minimum, and the liquid crystal cells of green (G) is provided with data-signal V63 so that the optical transmission maximum.If color alignment is according to the order that begins from above to red (R), green (G) and blue (B), so since the liquid crystal cells of red (R) be provided with have with the indigo plant (B) of the data-signal of front data-signal red thus (R) liquid crystal cells of the identical voltage level of liquid crystal cells be not subjected to the influence of earlier data signal.Yet the voltage that in fact is applied to the liquid crystal cells of green (G) is subjected to being provided for the influence of the data-signal (voltage V0) of red (R) liquid crystal cells, for example, approximately becomes the voltage V61 that makes two gray scales of unit deepening (gray scale) level.On the other hand, the voltage that in fact is applied to indigo plant (B) liquid crystal cells is subjected to the influence of the data-signal V63 of green (G) liquid crystal cells, for example, becomes and approximately makes the brighten voltage V2 of two gray levels of unit.Therefore, can not reproduce primitive color.Although as an example, suppose that effect is two gray levels and described this phenomenon, the voltage that in fact is applied to liquid crystal cells can be from the primary voltage three or more gray levels that are shifted.Be shifted quantitative change greatly to have around vibration (round) waveform data signal in position voltage away from data driver IC.
Summary of the invention
According to the present invention, the colorrendering quality of the display panel that the bar of can improving the standard is arranged.
In aspect of the present invention, provide the method that drives display panel.Display panel comprises: comprise first to first scanning group of three scan line and with a plurality of the 3rd display units of a plurality of second display units of a plurality of first display units of first many data lines that intersect to three scan line and first color that is connected with first sweep trace, second color that is connected with second sweep trace, the 3rd color that is connected with three scan line.By the described method of following described realization: in the period data line is pre-charged to predetermined voltage in first level; And after the pre-charging data line, data-signal is offered first to the 3rd display unit in the period by the data line that drives first to the 3rd display unit in first level.In the driving of first to the 3rd display unit, at first drive in first to the 3rd display unit corresponding to the display unit that has a color of maximum spectral luminous efficacy in first to the 3rd color.
In another aspect of the present invention, display device comprises data driver; Display panel; And scan line driver circuit.Display panel comprises: comprise first first scanning group to three scan line; With first to the three scan line data line crossing; A plurality of first display units of first color that is connected with first sweep trace; A plurality of second display units of second color that is connected with second sweep trace; And a plurality of the 3rd display units of the 3rd color that is connected with three scan line.First level in the period data driver data line is pre-charged to predetermined voltage, and in the period after the pre-charging data line, data-signal is offered first to the 3rd display unit by the data line that drives first to the 3rd display unit in first level.Scan line driver circuit at first drives first and have a corresponding data line of color of maximum spectral luminous efficacy to the three scan line with in described first to the 3rd color.
According to the present invention, the colorrendering quality of the display panel that the bar of can improving the standard is arranged.
Description of drawings
In conjunction with the accompanying drawings, according to the following description of some exemplary embodiment, above and other aspect, advantage and feature will be more obvious, wherein:
Fig. 1 is the block diagram of structure that the liquid crystal indicator of the first embodiment of the present invention is shown;
Fig. 2 is the circuit diagram that the structure of the data driver IC in the first embodiment of the present invention is shown;
Fig. 3 is the concept map that the method that drives the display panels among first embodiment is shown;
Fig. 4 illustrates the sequential chart of the method that drives the display panels among first embodiment;
Fig. 5 is the table of the relation of the influence of driving order that liquid crystal cells is shown, earlier data signal and power consumption;
Fig. 6 illustrates gamma curve that is applied to the brilliant unit of green liquor and the figure that is applied to the gamma curve of red and blue liquid crystal cells;
Fig. 7 is the concept map that the method that drives the display panels in the second embodiment of the present invention is shown;
Fig. 8 illustrates the sequential chart in the method that drives the display panels in the third embodiment of the present invention;
Fig. 9 illustrates the sequential chart in the method that drives the display panels among the 3rd embodiment;
Figure 10 A is the concept map that the structure of the display panels in the fourth embodiment of the present invention is shown;
Figure 10 B is the plan view of structure that the display panels of a fourth embodiment in accordance with the invention is shown;
Figure 11 is the concept map that the method for driving display panels according to a fifth embodiment of the invention is shown;
Figure 12 is the concept map that the method for driving display panels according to a fifth embodiment of the invention is shown;
Figure 13 is the concept map that the method for driving display panels according to a fifth embodiment of the invention is shown;
Figure 14 is the table of the scanning sequency of the sweep trace in the display panels that illustrates according to a fifth embodiment of the invention;
Figure 15 is the concept map that the method for driving display panels according to a sixth embodiment of the invention is shown;
Figure 16 is the table of the scanning sequency of the sweep trace in the display panels that illustrates according to a sixth embodiment of the invention;
Figure 17 illustrates the sequential chart of display panels according to a sixth embodiment of the invention;
Figure 18 is the table of the scanning sequency of the sweep trace in the display panels that illustrates according to a seventh embodiment of the invention; And
Figure 19 illustrates the sequential chart of display panels according to a seventh embodiment of the invention.
Embodiment
Hereinafter, will describe in detail with reference to the accompanying drawings according to liquid crystal indicator of the present invention.
[first embodiment]
Fig. 1 is the block diagram that illustrates according to the structure of the liquid crystal indicator of the first embodiment of the present invention.Liquid crystal indicator 1 has display panels 2 and has the data driver IC 3 of built-in sequential control circuit.Data driver IC 3 drives the data line X1 to Xm of display panels 2.And data driver IC 3 offers control signal scan line drive circuit 5 and fixed voltage is offered public electrode.As the installment state of data driver IC 3, there are COG (glass top chip), COF (chip on the film), TCP (band carries encapsulation) or the like.
In display panels 2, form data line X1 to Xm and sweep trace Y1 to Y3n, and liquid crystal cells 9 is formed on the infall of these lines to be used as display unit.Liquid crystal cells 9 is provided with TFT 7 (thin film transistor (TFT)) and the pixel electrode 8 as on-off element.In each liquid crystal cells 9, at pixel electrode 8 with towards filling liquid crystal between its public electrode.Gate electrode with TFT 7 is connected to sweep trace Y1 to Y3n respectively, the source electrode of TFT 7 is connected to data line X1 to Xm, and the drain electrode of TFT 7 is connected to pixel electrode 8.Scan line drive circuit 5 is formed on the display panels 2 sweep signal is offered sweep trace Y1 to Y3n.For the corrugated gasket that reduces sweep signal around vibration (rounding), what need is right side and the left side that scan line drive circuit 5 is provided at display panels 2, and drives a sweep trace simultaneously from right side and left side.
In liquid crystal cells 9, auxiliary capacitor often is provided between the sweep trace of pixel electrode 8 and firm scanning before.The structure that depends on liquid crystal cells 9 is not to need to provide auxiliary capacitor all the time.Yet, depending on scanning sequency, pixel electrode 8 receives the influence from the coupling noise of pixel electrode in another row or sweep trace Y, thus image quality decrease.Therefore, auxiliary capacitance line 6 (not shown) need be provided between pixel electrode 8 and the sweep trace to have capacitive function and function of shielding.The voltage identical with the voltage that is applied to public electrode is applied to auxiliary capacitance line 6 and guarded electrode.
The colored filter of horizontal stripe pattern type is provided to cover liquid crystal cells 9.Colored filter with same color covers the liquid crystal cells 9 that is connected to same sweep trace.At length, for the liquid crystal cells 9 that is connected to sweep trace Y (3i-2) provides red (R) colored filter, for the liquid crystal cells 9 that is connected to sweep trace Y (3i-1) provides green (G) colored filter, and provide blue (B) colored filter for the liquid crystal cells 9 that is connected to sweep trace Y3i.In the following description, for providing the liquid crystal cells 9 of red (R) colored filter, it is called as the R liquid crystal cells, be called as the G liquid crystal cells for it provides the liquid crystal cells 9 of green (G) colored filter, and be called as the G liquid crystal cells for it provides the liquid crystal cells 9 of blue (G) colored filter.A pixel comprises R liquid crystal cells, G liquid crystal cells and B liquid crystal cells, and above-mentioned liquid crystal cells is formed the matrix of triplex row one row.In Fig. 1, be connected to the R liquid crystal cells of sweep trace Y (3i-2) with symbol " Ri " expression, represent to be connected to the G liquid crystal cells of sweep trace Y (3i-1) with symbol " Gi "; And be connected to the B liquid crystal cells of sweep trace Y3i with symbol " Bi " expression.The sweep trace that is connected to the R liquid crystal cells is called as the R sweep trace, and the sweep trace that is connected to the G liquid crystal cells is called as the G sweep trace, and the sweep trace that is connected to the B liquid crystal cells is called as the B sweep trace.
In the display panels that has with the number of the corresponding pixel of WXGA (1280x768 pixel), when colored filter is in the vertical bar pattern, data line be 3840 and sweep trace be 768.On the other hand, as present embodiment, when colored filter is in the horizontal stripe pattern, data line be 1280 and sweep trace be 2304.Therefore, the data driver IC 3 that only has 1280 outputs is installed on the display panels 2.
Fig. 2 is the circuit diagram that the structure of data driver IC 3 is shown.Fig. 2 illustrates two data line X1 being used for driving data driver IC 3 and the circuit part of X2.It will be appreciated by those skilled in the art that the circuit part of the data line that is configured to drive other similarly.Data driver IC 3 has latch cicuit 11 and 12, multiplexer 20, positive polarity level shifter 31, negative polarity level shifter 32, positive electrode driving circuit 50, negative electrode driving circuit 60, polarity switching circuit 70 and lead-out terminal 81 and 82.In addition, although do not illustrate, data driver IC 3 also comprises input terminal, shift-register circuit, sequential control circuit, data buffer of view data, clock signal or the like or the like.The data driver IC that the line preface drives has sample latch and keeps 2 grades of structures of latch.Latch cicuit 11 and 12 is to keep latch.It should be noted sample latch is not shown.Data buffer offers view data sample latch and sequentially latchs view data in response to the sampled signal from shift-register circuit output by sample latch.In response to latch signal STB when the beginning of a level period with the image data transmission that latchs to latch cicuit 11 and 12.
Latch cicuit 11 and 12 keeps level period of view data.Latch cicuit 11 is provided with the latch 11z that the latch 11x of the view data that is used to latch green (G), the latch 11y and being used to that is used to latch the view data of red (R) latch the view data of indigo plant (B).Here, the view data of green (G) is that the view data of the data that are used to specify the gray level of G liquid crystal cells, red (R) is to be used to specify the data of gray level of R liquid crystal cells and the view data of indigo plant (B) is the data that are used to specify the gray level of B liquid crystal cells.Similarly, latch cicuit 12 is provided with the latch 12z that the latch 12x of the view data that is used to latch green (G), the latch 12y and being used to that is used to latch the view data of red (R) latch the view data of indigo plant (B).
Multiplexer 20 is provided with a plurality of switches 21,22 and 23.At length, switch 21,22 and 23 is provided at respectively between latch 11x, 11y and 11z and the positive polarity level shifter 31.Similarly, switch 21,22 and 23 is provided at respectively between latch 12x, 12y and 12z and the negative polarity level shifter 32.Latch cicuit 11 and 12 and multiplexer 20 formed with lower voltage component, and under the voltage between GND (0V) and the VCC (3V), operate.
Form positive polarity level shifter 31 by medium voltage element (that is, having the element of middle voltage breakdown), and this positive polarity level shifter 31 is operated to the level shift that carries out input voltage from the scope of 0V to 6V in the scope from 0V to 3V.By medium voltage element and high voltage devices (promptly, element with high withstand voltage) form negative polarity level shifter 32, and negative polarity level shifter 32 from the scope of 0V to 3V to the level shift operation of from the scope of-5V to 0V, carrying out input voltage.
Positive electrode driving circuit 50 is according to the data-signal of view data output cathode, and is provided with positive polarity D/A change-over circuit 51, switch 52 and 53 and positive polarity grayscale voltage generative circuit 55.Switch 52 is provided between positive polarity D/A change-over circuit 51 and the node p1.Switch 53 is provided between node p1 and the reference voltage line c1.Form positive electrode driving circuit 50 by the medium voltage element, and this positive electrode driving circuit 50 is being operated to the voltage range of VPH (6V) from GND (0V).
Negative electrode driving circuit 60 is according to the data-signal of view data output negative pole, and is provided with negative polarity D/A change-over circuit 61, switch 62 and 63 and negative polarity grayscale voltage generative circuit 65.Switch 62 is provided between negative polarity D/A change-over circuit 61 and the node n1, and switch 63 is provided between node n1 and the reference voltage line c1.Form negative electrode driving circuit 60 by the medium voltage element, and this negative electrode driving circuit 60 (is being operated to the voltage range of GND (0V) 5V) from VNL.
In the number of the number of positive polarity D/A change-over circuit 51 and negative polarity D/A change-over circuit 61 each is half of number of data line X1 to Xm, and when display panels 2 was supported WXGA, each all was 640.It should be noted, in data driver IC 3, exist a positive polarity grayscale voltage generative circuit 55 and a negative polarity grayscale voltage generative circuit 65 just enough.Electrically separate positive electrode driving circuit 50 and negative electrode driving circuit 60 by deep-well, SOI (silicon-on-insulator) or the like.
Positive polarity grayscale voltage generative circuit 55 is divided voltage to generate the grayscale voltage of positive polarity by the resistance that is connected in series.Positive polarity grayscale voltage generative circuit 55 is provided with the circuit of the voltage V0p that is used to generate minimum brightness, the circuit of voltage V63p that is used to generate maximum brightness and the circuit that is used for accurate adjustment.Positive polarity grayscale voltage generative circuit 55 is provided with the register that is used for G, and it is used to specify the shape of the gamma curve when the data-signal by positive polarity drives the G liquid crystal cells; With the register that is used for RB, it is used to specify the shape of the gamma curve when the data-signal by positive polarity drives R liquid crystal cells and B liquid crystal cells.Therefore, positive polarity grayscale voltage generative circuit 55 can be controlled gamma curve and the gamma curve when the data-signal by positive polarity drives R liquid crystal cells and B liquid crystal cells when the data-signal by positive polarity drives the G liquid crystal cells independently.
Similarly, negative polarity grayscale voltage generative circuit 65 is divided voltage to generate the grayscale voltage of negative polarity by the resistance that is connected in series.Negative polarity grayscale voltage generative circuit 65 is provided with the circuit of the voltage V0n that is used to generate minimum brightness, the circuit of voltage V63n that is used to generate high-high brightness and the circuit that is used for accurate adjustment.Negative polarity grayscale voltage generative circuit 65 is provided with the register that is used for G, and it is used to specify the shape of the gamma curve when the data-signal by negative polarity drives the G liquid crystal cells; With the register that is used for RB, it is used to specify the shape of the gamma curve when the data line by negative polarity drives R liquid crystal cells and B liquid crystal cells.Gamma curve when therefore, negative polarity grayscale voltage generative circuit 65 can be controlled gamma curve when the data-signal by negative polarity drives the G liquid crystal cells and the data-signal by negative polarity independently and drives R liquid crystal cells and B liquid crystal cells.
Polarity switching circuit 70 is provided with a plurality of switches 71,72,73 and 74.Switch 71 is provided between node p1 and the lead-out terminal 81, and switch 72 is provided between node p1 and the lead-out terminal 82.Switch 73 is provided between node n1 and the lead-out terminal 81, and switch 74 is provided between node n1 and the lead-out terminal 82.Form polarity switching circuit 70 and this polarity switching circuit 70 (5V) is being operated from VNL by high voltage devices to the voltage range of VPH (6V).Polarity switching circuit 70 can be selected to operate under the voltage Vgon at scanning non-selection voltage Vgoff and scanning.Can on display panels 2, form polarity switching circuit 70 in the mode identical with scan line drive circuit 5.
Brief and concise for figure do not illustrate the control signal that is used to control each switch in Fig. 2.According to the control signal of separation with different voltage levels with much at one sequential control switch 52 and switch 62.According to the control signal of separation with different voltage levels with much at one sequential control switch 53 and switch 63.By same control signal gauge tap 71 and switch 74.Also by same control signal gauge tap 72 and switch 73.Expectation be the control signal that to the direction of its middle body, is provided for these switches at right-hand member and left end from data driver IC 3.This is because the interconnection of expansion need be provided on display panels 2.Therefore because the distance between the lead-out terminal of data driver IC 3 is narrower than the distance between the data line, if the interconnection of the expansion of left end and right-hand member is long, resistance becomes bigger so., compare for this reason, shorten thereby the waveform passivation of the data-signal of left end and right-hand member becomes effective write time of big left end and right-hand member with the data-signal of center.For this reason, for no matter how the position of display panels 2 equates the voltage that writes of liquid crystal cells, the write time of the data-signal of center is caught to be shorter than the write time of the data-signal of left end and right-hand member.Yet when from left end and right-hand member driven sweep simultaneously line, because the waveform passivation of the sweep signal of the center of display panels 2 is big, and the waveform passivation of the sweep signal at left end and right-hand member place is little, so the write time of center shortens.Therefore, expectation be, the output timing that can suitably adjust data-signal make to eliminate since the waveform passivation of the waveform passivation of sweep signal and data-signal cause write voltage differences.When the output timing of data-signal not simultaneously, can obtain to reduce EMI and can make the picture quality advantage of uniform.
Sequential control circuit is in response to all being the required control signal of sequential control that generates data driver IC 3 and scan line drive circuit 5 from clock signal clk, horizontal-drive signal HS and vertical synchronizing signal VS that external circuit provides.Because data driver IC 3 is different with the operating voltage between the scan line drive circuit 5, so control signal is provided for each circuit part of data driver IC 3 and scan line drive circuit 5 by level shifter.Sequential control circuit is provided with counter, this counter is used for count level synchronizing signal HS, and expectation is, along with the distance of 9 sweep traces that are connected to from data driver IC 3 to liquid crystal cells becomes far away more, the voltage amplitude of the gamma curve of its green (G) (between minimum brightness voltage V0 and the high-high brightness voltage V63 poor) becomes big more.In other words, for the liquid crystal cells 9 that has the signal of big waveform passivation away from data driver IC3 and reception, corrected value is caught big and near data driver IC 3 and receive the liquid crystal cells 9 of the signal with little waveform passivation, corrected value is caught less.Use vertical synchronizing signal VS counter reset.In grayscale voltage generative circuit 55 and 65, the grayscale voltage of the value that the value of the setting sum counter of the register that is used for G keeps is depended in generation.
It should be noted that in above-mentioned data driver IC 3, the data-signal of opposite polarity is provided for the data line X (2k-1) of odd-numbered and the data line X2k of even-numbered respectively.For example, when from the data-signal of data line X (2k-1) output cathode of odd-numbered, from the data-signal of the data line X2k output negative pole of even-numbered.On the contrary, when from the data-signal of data line X (2k-1) output negative pole of odd-numbered, from the data-signal of the data line X2k output cathode of even-numbered.
Subsequently, will the method that drive the display panels 2 in the present embodiment be described with reference to figure 3.In Fig. 3,, drive the method for the liquid crystal cells 9 that is connected to six sweep trace Y1 to Y6 and four data line X1 to X4 in order to simplify explanation.By the numeral of being enclosed the order that sweep trace Y1 to Y6 wherein is scanned is shown respectively among Fig. 3, the symbol "+" among Fig. 3 and "-" represent to be provided for the polarity of the data-signal of liquid crystal cells 9 respectively.The data-signal of symbol "+" expression positive polarity is provided, and the data-signal of symbol "-" expression negative polarity is provided.Owing to arrange target liquid crystal cells 9 to form six row, four row and to form each pixel, so Fig. 3 illustrates the pixel of two row, four row from the liquid crystal cells 9 that triplex row one is listed as.
In the present embodiment, three sweep traces being placed are continuously formed a scanning group.A sweep trace that is connected to the R liquid crystal cells in the middle of three sweep traces of a scanning group, a sweep trace that is connected to the G liquid crystal cells in the remaining sweep trace, and the last item sweep trace is connected to the sweep trace of B liquid crystal cells.In the following description, sweep trace Y1, Y2 and Y3 are called as first scanning group, and sweep trace Y4, Y5 and Y6 are called as second scanning group.Similarly, sweep trace Y (3i-2), Y (3i-1) and Y3i are called as i scanning group (i is a natural number).If display panels 2 has the number with the corresponding pixel of WXGA, i is the integer between 1 and 768 so.In the present embodiment, according to first scanning group, second scanning group ... and the select progressively sweep trace of n scanning group.
In the present embodiment, three scanning periods of definition in a level period (wherein horizontal-drive signal HS be activated time period).Here, scanning is selecteed period of sweep trace wherein the period, and the liquid crystal cells 9 that is connected to selected sweep trace is driven.Owing in a scanning group, comprise three sweep traces, so select the sweep trace of a scanning group in the period a level.Be at its colored filter under the situation of the display panels 2 that horizontal bar arranges, compare one with the situation of vertical bar arrangement and scan the period and shorten.That is, when the color arrangement is vertical bar, is scanning period of a level period definition, and when the color arrangement is horizontal bar, has defined three scanning periods in the period a level.In the driving of the display panels 2 that adopts horizontal bar to arrange, scanning period shortened to 1/3 of the scanning period that about vertical bar is arranged.Therefore, it has brought a lot of shortcomings, especially the shortcoming of the deterioration in the colorrendering quality.
In the driving method of present embodiment, in order to improve colorrendering quality, and then drive the G liquid crystal cells that is connected to the G sweep trace afterwards all data line X1 to Xm being pre-charged to predetermined reference voltage (typically, system earth voltage GND).Carry out precharge by the reference voltage line c1 that all data line X1 to Xm is shorted to system earth voltage.
At length, after precharge, and then select the G sweep trace, so be provided among the data line X1 to Xm each according to the data-signal of the view data of green (G).And then the reason that drives the G liquid crystal cells after precharge is just to eliminate influence at the data-signal that provides before from the voltage that is used for actual driving G liquid crystal cells.The green of comparing with red and blueness has high spectral luminous efficacy, and is easily recognized luminance difference.Therefore, when data-signal is provided for the G liquid crystal cells, if since just the voltage that causes the actual G of being applied to liquid crystal cells in the influence of the data-signal that provides before from the required voltage level shift, colorrendering quality deterioration so.By after precharge, and then driving the G liquid crystal cells, can just eliminate influence from the voltage that is used for actual driving G liquid crystal cells at the data-signal that provides before.
Subsequently, after driving the G liquid crystal cells, drive R liquid crystal cells that is connected to the R sweep trace and the B liquid crystal cells that is connected to the B sweep trace.In the operation of Fig. 3, at first, the R sweep trace is selected, and is provided for each data line X1 to Xm according to the data-signal of the view data of red (R).Therefore, the R liquid crystal cells is driven.In addition, the B sweep trace is selected, and is provided for each data line X1 to Xm according to the data-signal of the view data of blue (B).Therefore, the B liquid crystal cells is selected.Influence at the data-signal that provides before just is provided in the driving of R liquid crystal cells and B liquid crystal cells.For example, the voltage that is used for actual driving R liquid crystal cells just is subjected to driving in being used to of providing before the influence of the data-signal of G liquid crystal cells.The voltage that is used for actual driving B liquid crystal cells just is subjected to driving in being used to of providing before the influence of the data-signal of R liquid crystal cells.Yet,,, also very little to the influence of in fact observed color so even therefore existence is just in the influence of the data-signal that provides before owing to the red and blue low spectral luminous efficacy that has of comparing with green.
Like this, in the driving method of Fig. 3, by after precharge, and then driving the G liquid crystal cells, just eliminate influence at before data-signal from the voltage that is used for actual driving G liquid crystal cells, thus and improvement colorrendering quality.It should be noted, although in the driving method of Fig. 3, after driving the R liquid crystal cells, drive the B liquid crystal cells, the order of the driving of also can reverse R liquid crystal cells and B liquid crystal cells.
In the present embodiment, for the quality of more raising images, the polarity of inverted data signal between adjacent data line, and the polarity of inverted data signal of every level period (that is per three scanning periods).This kind driving method can be called as the 3G inversion driving in the description of back.In the 3G of present embodiment inversion driving, public electrode is maintained at fixing common electric voltage.With reference to figure 3, the polarity that will be described below the data-signal of (2j-1) individual frame in the period as a specific example.About the liquid crystal cells 9 that is connected to data line Y1 to Y3, the polarity of data-signal that is provided for the liquid crystal cells 9 that is connected to data line X1 and X3 is being for just, and the polarity of data-signal that is provided for the liquid crystal cells 9 that is connected to data line X2 and X4 is for negative.On the other hand, about the liquid crystal cells 9 that is connected to data line Y4 to Y6, the polarity of data-signal that is provided for the liquid crystal cells 9 that is connected to data line X1 and X3 is for negative, and the polarity of data-signal that is provided for the liquid crystal cells 9 that is connected to data line X2 and X4 is for just.The polarity that is applied in the voltage of all liquid crystal cells 9 during the 2j frame period is inverted.By adopting this kind 3G inversion driving, can suppress flicker in the vertical bar pattern and the cross (talk) in the pattern of windows, flicker in the above-mentioned vertical bar pattern and the cross (talk) in the pattern of windows all are the problems in the row inversion driving.
Next, will describe the method that drives the display panels 2 in the present embodiment below with reference to the sequential chart of figure 4 in detail.Suppose that view data is 6 (64 gray levels), and the liquid crystal of liquid crystal cells 9 is normal black.In addition, in sexadecimal notation, represent to be equivalent to the binary number 000000 of zero gray level, and in sexadecimal notation, represent to be equivalent to the binary number 111111 of the 63rd gray level by 3Fh by 00h.When the value of view data was 00h, the optical transmission rate became minimum (deceiving), and when it was 3Fh, the optical transmission rate became maximum (in vain).The grayscale voltage of the positive polarity when view data is 00h is described to V0p, and the grayscale voltage that is used for the negative polarity of same view data is described to V0n.In addition, the grayscale voltage of the positive polarity when view data is 3Fh is described to V63p, and the grayscale voltage that is used for the negative polarity of same view data is described to V63n.The sequential chart of Fig. 4 illustrates the demonstration example of blue or green raster pattern as display pattern, and power consumption is owing to data-signal becomes maximum.In order to show blue or green raster pattern, the view data of red (R) is set to 00h on the whole plane of display panels 2, and the view data of green (G) is set to 3Fh, and the view data of blue (B) is set to 3Fh.Below, although have only the operation relevant with the driving of the liquid crystal cells 9 that is connected to data line X1, X2 to be mentioned, those skilled in the art can easily understand the liquid crystal cells 9 that is connected to other data line and also be driven similarly.
In Fig. 4, time t10 is the start time of the first level period of (2j-1) individual frame period.Just as follows early than the state of the switch before the time t9 of time t10.Switch 21 and 22 keeps off state, and switch 23 keeps conducting state.Switch 53 and 63 has been switched on, and switch 52 and 62 has been turned off. Switch 71 and 74 keeps off state and switch 72 and 73 to keep conducting state.Under this kind state, D/A change- over circuit 51 and 61 output are high impedance (hereinafter, being abbreviated as Hi-Z).In the following description, when having only conducting when each switch/off state to change, switch just can be mentioned.
Just the time t9 before the first level period began begins data line X1 and the X2 precharge to GND.At length, switch 53 and 63 is switched on, and switch 52 and 62 is turned off.When switch 53 and 63 was switched on, beginning data line X1 and X2 were to the precharge of GND.
Subsequently, at time t10, began for the first level period.At first, at time t10, switch 71 and 74 is switched on.When switch 71 and 74 was switched on, four switch switches 71 to 74 all were in conducting state, thereby have improved driving force.Therefore, data line X1 and X2 are accelerated to the precharge of GND.
In addition, at time t10, switch 21 is switched on, and switch 23 is turned off, and view data is transferred to latch cicuit 11 and 12 from the logical circuit (not shown).In the logical block in the prime of latch cicuit 11 and 12 (section), view data is processed to be transferred to and the corresponding latch cicuit 12 of target data line.Grayscale voltage generative circuit 55 and 65 is set to the corresponding grayscale voltage of gamma curve of generation and green (G).When switch 21 was switched on, the view data of green (G) was input to positive polarity level shifter 31, and selected the grayscale voltage according to the positive polarity of view data in positive polarity D/A change-over circuit 51.The view data of green (G) is offered negative polarity level shifter 32, and in negative polarity D/A change-over circuit 61, select grayscale voltage according to the negative polarity of view data.
Next, at time t11, switch 52 and 62 is switched on, and switch 53 and 63 is turned off, and switch 72,73 is turned off.Simultaneously, the sweep trace Y2 of first scanning group is selected, and by on move voltage Vgon to.It should be noted that sweep trace Y2 is connected to the sweep trace of G liquid crystal cells.Under this state, the data-signal V63p of the positive polarity of green (G) is provided for data line X1, and the data-signal V63n of the negative polarity of green (G) is provided for data line X2, and the TFT 7 that is connected to selected sweep trace Y2 is switched on.Thereby the data-signal of green (G) is provided for each the pixel electrode 8 in the G liquid crystal cells that is connected to sweep trace Y2.Can between time t10 and time t11, promptly in the middle of precharge, select sweep trace Y2.
Next, at time t13, sweep trace Y2 is set to unselected state, and voltage of signals pulled down to voltage Vgoff.Thereby each the TFT 7 that is connected in the G liquid crystal cells of sweep trace Y2 is turned off, and the data-signal of green (G) is maintained at pixel electrode 8 places of G liquid crystal cells.
Next, at time t14, switch 21 is turned off, and switch 22 is switched on, and the view data of red (R) is provided for level shifter 31 and 32.In D/A change- over circuit 51 and 61, selected according to the grayscale voltage of view data.Simultaneously, the sweep trace Y1 of first scanning group is selected.It should be noted that sweep trace Y1 is connected to the sweep trace of R liquid crystal cells.Grayscale voltage generative circuit 55 and 65 generates the corresponding grayscale voltage of gamma curve with red (R) and blue (B).Under this state, the data-signal V0p of the positive polarity of red (R) is provided for data line X1, and the data-signal V0n of the negative polarity of red (R) is provided for data line X2, and the TFT 7 that is connected to selected sweep trace Y1 is switched on.Therefore, the data-signal of red (R) is provided for each the pixel electrode 8 in the R liquid crystal cells that is connected to sweep trace Y1.
Next, at time t16, sweep trace Y1 is set to non-selected state.Therefore, each the TFT 7 that is connected in the R liquid crystal cells of sweep trace Y1 is turned off, and the data-signal of red (R) is maintained at pixel electrode 8 places of R liquid crystal cells.
Next, at time t17, switch 22 is turned off, and switch 23 is switched on, and the view data of blue (B) is provided for level shifter 31 and 32.In D/A change- over circuit 51 and 61, selected according to the grayscale voltage of view data.Simultaneously, the sweep trace Y3 of first scanning group is selected.It should be noted that sweep trace Y3 is connected to the sweep trace of B liquid crystal cells.Under this state, the data-signal V63p of the positive polarity of blue (B) is provided for data line X1, and the data-signal V63n of the negative polarity of blue (B) is provided for data line X2, and the TFT 7 that is connected to selected sweep trace Y3 is switched on.Therefore, the data-signal of blue (B) is provided for each the pixel electrode 8 in the B liquid crystal cells.
Next, at time t18, sweep trace Y3 is caught not selected.Therefore, the TFT 7 that is connected to the B liquid crystal cells of sweep trace Y3 is turned off, and the data-signal of blue (B) is maintained at pixel electrode 8 places of B liquid crystal cells.
By said process, the driving of the B liquid crystal cells of having finished the G liquid crystal cells that is connected to sweep trace Y2, the R liquid crystal cells that is connected to sweep trace Y1 and being connected to sweep trace Y3.
Next, at time t19, begin the precharge of data line X1 and X2 once more.At length, switch 52 and 62 is turned off, and switch 53 and 63 is switched on, and D/A change- over circuit 51 and 61 is set to Hi-z.The data line X1 that is provided with the data-signal of positive polarity is precharged to GND with the data line X2 that is provided with the data-signal of negative polarity.
The driving period of G liquid crystal cells is the period TG from time t11 to time t14, and the driving period TR of R liquid crystal cells is the period TR from time t14 to time t17, and the driving period of B liquid crystal cells is the period TB from time t17 to time t19.In the present embodiment, liquid crystal cells 9 is driven to and makes period TG, period TR and period TB to equate on time span.
Next, at time t20, began for the second level period.At first, switch 72 and 73 is switched on.When switch 72 and 73 is switched on, therefore improved driving force because switch 71 to 74 is in the state of conducting simultaneously, and expedited data line X1 and X2 are to the precharge of GND.
In addition, at time t20, switch 21 is switched on, and switch 23 is turned off.In addition, view data is transferred to latch cicuit 11 and 12.In addition, grayscale voltage generative circuit 55 and 65 is set to the corresponding grayscale voltage of gamma curve of generation and green (G).The view data of green (G) is provided to level shifter 31 and 32, and selects the grayscale voltage according to view data in D/A change- over circuit 51 and 61.
Next, at time t21, switch 52 and 62 is switched on, and switch 53 and 63 is turned off, and switch 71 and 74 is turned off.Simultaneously, the sweep trace Y5 of second scanning group is selected.Under this state, the data-signal V63n of the negative polarity of green (G) is provided for data line X1, and the data-signal V63p of the positive polarity of green (G) is provided for data line X2, and the TFT 7 that is connected to sweep trace Y5 is switched on.Therefore, the data-signal of green (G) is provided for the pixel electrode 8 of the G liquid crystal cells that is connected to sweep trace Y5.
Next, at time t23, sweep trace Y5 is set to unselected state, and each the TFT 7 that is connected in the G liquid crystal cells of sweep trace Y5 is turned off, and the data-signal of green (G) is maintained at pixel electrode 8 places of G liquid crystal cells.
Next, at time t24, switch 21 is turned off, and switch 22 is switched on.Therefore the view data of red (R) is provided for level shifter 31 and 32, and selects the grayscale voltage according to view data in D/A change-over circuit 51 and 61.Simultaneously, the sweep trace Y4 of second scanning group is selected.It should be noted that sweep trace Y4 is connected to the sweep trace of R liquid crystal cells.With grayscale voltage generative circuit 55 and 65 be set to generate respectively with red (R) and indigo plant (B) the corresponding grayscale voltage of gamma curve.Under this state, the data-signal V0n of the negative polarity of red (R) is provided for data line X1, and the data-signal V0p of the positive polarity of red (R) is provided for data line X2, and the TFT 7 that is connected to sweep trace Y4 is switched on.Therefore, the data-signal of red (R) is provided for each pixel electrode of the R liquid crystal cells that is connected to sweep trace Y4.
Next, at time t26, sweep trace Y4 is set to non-selected state.Therefore, the TFT 7 that is connected to sweep trace Y4 is turned off, and the data-signal of red (R) is maintained at each pixel electrode 8 place of the R liquid crystal cells that is connected to sweep trace Y4.
Next, at time t27, switch 22 is turned off and switch 23 is switched on.Therefore, the view data of blue (B) is provided in level shifter 31 and 32 and selects grayscale voltage according to view data in D/A change-over circuit 51 and 61.Simultaneously, the sweep trace Y6 of second scanning group is selected.It should be noted that sweep trace Y6 is connected to the sweep trace of B liquid crystal cells.Under this state, the data-signal V63n of the negative polarity of blue (B) is provided for data line X1, and the data-signal V63p of the positive polarity of blue (B) is provided for data line X2, and the TFT 7 that is connected to sweep trace Y6 is switched on.Therefore, the data-signal of blue (B) is provided for each the pixel electrode 8 in the B liquid crystal cells that is connected to sweep trace Y6.
Next, at time t28, sweep trace Y6 is set to unselected state.Therefore, the TFT 7 that is connected to sweep trace Y6 is turned off, and the data-signal of blue (B) is maintained at the pixel electrode place of B liquid crystal cells.
Next, at time t29, switch 52 and 62 is turned off, and switch 53 and 63 is switched on, and D/ A conversion circuit 51 and 61 becomes Hi-z.Thereby the data line X1 that is provided with the data-signal of negative polarity is precharged to GND with the data line X2 that is provided with the data-signal of positive polarity.
After this operation, repeat with time t10 to the operation identical operations of time t29 up to the scanning of having finished the n scanning group.
At ensuing 2j frame in the period, drive liquid crystal cells 9 according to operation identical operations with (2j-1) individual frame period, the polarity that the difference of operation is to be applied to the data-signal of all liquid crystal cells 9 is inverted.
Describe said process briefly, in the period, the sweep trace Y1 to Y3 of first scanning group is scanned in first level.In the scanning of first scanning group, according to corresponding to the data line Y2 of green (G), corresponding to the sweep trace Y1 of red (R) and corresponding to the select progressively sweep trace Y1 to Y3 of the sweep trace Y3 of blue (B).In period, the sweep trace Y4 to Y6 of second scanning group is selected in ensuing second level.In the scanning of second scanning group, according to corresponding to the sweep trace Y5 of green (G), corresponding to the sweep trace Y4 of red (R) and corresponding to the select progressively sweep trace Y4 to Y6 of the sweep trace Y6 of blue (B).Similarly, in the i level period, the sweep trace Y (3i-2) of i scanning group is scanned to Y3i.In the scanning of i scanning group, according to corresponding to the sweep trace Y (3i-1) of green (G), corresponding to the sweep trace Y (3i-2) of red (R) and corresponding to the select progressively sweep trace Y (3i-2) of the sweep trace Y3i of blue (B) to Y3i.All data line X1 to Xm are precharged to GND during level blank (blanking) period (period from time t9 to time t11, from time t19 to time t21 period).In addition, the polarity of inverted data signal of every level period (per three scanning periods).The polarity difference of the data-signal between two adjacent data lines.For the reverse polarity of each pixel of each frame.
According to this kind driving method, can improve colorrendering quality.Because the liquid crystal cells 9 of green before data-signal is provided (G) is precharged to GND, so the data-signal influence that drives described unit and just be not subjected to providing before with required voltage.Because for the human spectral luminous efficacy height of green, so the influence of just eliminating in driving the liquid crystal cells 9 of green (G) concerning the improvement of colorrendering quality at the data-signal that provides before is effective.On the other hand, the driving of the liquid crystal cells 9 of red (R) and blue (B) is subjected to the influence of earlier data signal.For example,, it is desirable to, drive the liquid crystal cells 9 of green (G), red (R) and blue (B) respectively at voltage V63, V0 and V63 in order to show blue or green raster pattern.But, because the influence of earlier data signal, for example, the voltage that is kept by the liquid crystal cells 9 of red (R) becomes the corresponding voltage V2 of gray level with two gray levels that brightened, and has been become with deepening the corresponding voltage V61 of gray level of two gray levels by the voltage that the liquid crystal cells 9 of blue (B) keeps.Yet, because the liquid crystal cells 9 of red (R) and blue (B) has the spectral luminous efficacy lower than the liquid crystal cells 9 of green (G), so be difficult to recognize the luminance difference that causes owing to change from primary voltage.Therefore, to almost not influence of colorrendering quality.
In addition, the driving method of present embodiment uses the 3G inversion driving, and wherein the polarity of data-signal is inverted between adjacent data line, and the polarity of inverted data signal of every level period (that is per three scanning periods).The employing of 3G inversion driving in suppressing the vertical bar pattern flicker and the cross (talk) in the pattern of windows aspect all be effectively, wherein suppress flicker in the vertical bar pattern and the cross (talk) in the pattern of windows and all be the problem in the row inversion driving.
The tabulation of " GRB order " of the table of Fig. 5 show when drive sweep trace in the scanning in each scanning group in order corresponding to green (G), during corresponding to the sweep trace of red (R) and corresponding to the sweep trace of blue (B), the current sinking that causes owing to data line and the effect of earlier data signal.Suppose colored filter be in the horizontal bar that begins red (R), green (G) and blue (B) from the top arrange and the liquid crystal of liquid crystal cells 9 be normal black.Consider the consumed current amount based on the white raster figure in the inversion driving (1G inversion driving).In the determining of influence degree, when two gray levels of voltage shift, what determine is, the intrinsic brilliance of liquid crystal cells 9 becomes " bright " or " secretly ", and when gray level of voltage shift, what determine is that the intrinsic brilliance of liquid crystal cells 9 becomes " bright slightly " or " dark slightly ".Here, it should be noted, depend on number, frame rate, driving voltage of pixel or the like, have three gray levels of voltage shift or more situation.When hot raster pattern was displayed on the liquid crystal panel 2, the view data of red (R) was that the view data of 3Fh and indigo plant (B) and green (G) is 00h.Under these circumstances, the voltage that is provided for the data-signal of data line is voltage V63 when the driving liquid crystal cells 9 of red (R) and is voltage V0 when driving the liquid crystal cells 9 of green (G) and indigo plant (B).Yet, Fig. 5 illustrates voltage that the liquid crystal cells 9 by red (R) keeps because the influence of the data-signal of green (G) has become with deepening the corresponding voltage V61 of gray level (voltage level V0) of two gray levels, and the voltage that is kept by the liquid crystal cells 9 of blue (B) is because the influence of the data-signal of red (R) becomes the corresponding voltage V2 of gray level (voltage level V63) with two gray levels that brightened.Omitted description about other Show Color.
When driving the display panels 2 that horizontal bar arranges, the grayscale voltage generative circuit 55 of data driver IC 3 and 65 can be handled and generate and the setting of the corresponding grayscale voltage of gamma curve of green (G) and the generation setting with the corresponding grayscale voltage of gamma curve of red (R) and indigo plant (B).Switch the setting that to use according to the time.When driving the liquid crystal cells 9 of green (G), the voltage level of data line becomes negative polarity or positive polarity from the GND level.That is, the voltage level increase that pre-determines data line still reduces.Because very little in the voltage difference of minimum brightness voltage V0 place and GND, thus also very little by the correcting value of gamma curve, and since very big in the voltage difference of high-high brightness voltage V63 place and GND, so also very big by the correcting value of gamma curve.On the other hand, when driving the liquid crystal cells 9 of red (R) and blue (B), be subjected to the influence of earlier data signal, still reduce so can not pre-determine the voltage level increase of data line owing to drive.Therefore, the voltage level of correction data signal uniformly.Therefore, as shown in Figure 6, the voltage amplitude of green gamma curve (between minimum brightness voltage V0 and the high-high brightness voltage V63 poor) is greater than the voltage amplitude of the gamma curve of red (R) and blue (B).According to present embodiment, its spectral luminous efficacy is that the liquid crystal cells 9 of high green (G) can be adjusted the color that realizes approaching ideal value by following four, described four be adjusted into pre-charge voltage, precharge period, by with the driving period and the gamma curve of the corresponding data-signal of view data.
Next, the current sinking amount will be described.In an inversion driving (1G inversion driving), when liquid crystal when being often black, the consumed current quantitative change is a maximal value in white raster figure.As benchmark (being called as reference current after a while) consumed current amount in row inversion driving and the 3G inversion driving is described with using the consumed current amount in the data line at this moment.In the row inversion driving, the consumed current amount for minimum is and the irrelevant raster pattern of the variation of voltage in the data line.In contrast, be maximum in consumed current quantitative change under the situation of pinkish red and clear water riglet figure and under the situation of pinkish red and green trellis diagram.But the consumed current amount only is half of reference current under the situation of the 1G of white raster figure inversion driving.
In the 3G of present embodiment inversion driving, the displayed map of maximization current sinking amount is blue or green raster pattern, and the current sinking amount approximately is 2/3 of a reference current.Therefore, (row inversion driving＜3G inversion driving＜1G inversion driving) change is big in order for the maximum consumption magnitude of current.
Because because the employing that horizontal bar is arranged, sweep trace increases to three times, the load capacity of data line increases, and driving frequency becomes three times; The current sinking amount of data driver IC 3 increases, and has produced heat.In the big part of the data driver IC 3 internal consumption magnitudes of current is level shifter 31 and 32 and D/A change-over circuit 51 and 61.When picture signal was inverted, transient current flowed in level shifter 31 and 32, and this has increased the current sinking amount.Because D/A change- over circuit 51 and 61 comprises the amplifier such as voltage follower, so the current sinking quantitative change is big.Because power consumption and supply voltage is square proportional, so the reduction supply voltage is effective.Therefore, in the present embodiment, utilize voltage-operated positive electrode driving circuit 50 of separate power source and negative electrode driving circuit 60.
In addition, expectation is that the voltage amplitude of the data-signal of the positive polarity that is generated by positive electrode driving circuit 50 is different from the voltage amplitude of the data-signal of the negative polarity that is generated by negative electrode driving circuit 60.The threshold voltage vt of the TFT 7 of each liquid crystal cells 9 depends on the voltage level Vd of data-signal and is expressed as Vt=Vd+Vt0.In this equation, Vt0 is the threshold voltage that does not rely on the voltage level Vd of data-signal.If TFT 7 is n types, the threshold voltage vt under the threshold voltage vt under the situation of the data-signal of positive polarity becomes the situation of the data-signal that is higher than negative polarity so.Therefore and since sweep signal around vibration (rounding), the conducting period shortens in positive electrode, and writes efficient minimizing to pixel electrode 8.Why the true formula that the feedthrough error of TFT 7 is big for the data-signal of positive polarity needs one of should be on voltage amplitude different mutually reason of the data-signal of the data-signal of positive polarity and negative polarity.Represent the electric capacity of liquid crystal cells 9 with Cc, and represent the grid capacitance of TFT 7 with Cg, and represent the cut-off voltage of the grid voltage of TFT 7 with Vgoff, feedthrough error delta V is expressed as Δ V=(Vgoff-Vt) * Cg/ (Cc+Cg).The data-signal that has with the positive polarity of the big voltage difference of cut-off voltage Vgoff causes big feedthrough error.In order to proofread and correct these factors, the voltage amplitude of the data-signal of positive polarity is caught the voltage amplitude greater than the data-signal of negative polarity.
Can be according to corresponding to the sweep trace of green (G), carry out scanning in each scanning group corresponding to the sweep trace of blue (B) and corresponding to the order of red (R) sweep trace.The tabulation of " GBR order " of the table of Fig. 5 show when drive sweep trace in the scanning in each scanning group in order corresponding to green (G), the effect of current sinking amount and earlier data signal in the data line during corresponding to the sweep trace of indigo plant (B) and corresponding to the sweep trace of red (R).Under these circumstances, the displayed map (pattern) of maximization current sinking amount is yellow raster pattern, and the current sinking amount approximately is 2/3 of a reference current.
Although in the present embodiment, reference voltage has been described to system earth voltage, and reference voltage also can be VDD/2 (half of VDD).If VDD=12V, reference voltage is 6V so, VPH=12V, and VNL=0V, and positive electrode is in the voltage range of 6V to 12V, and negative electrode is in the voltage range of 0V to 6V.What need is, specifies electrode that its voltage is higher than reference voltage as positive electrode and specify its voltage to be lower than the electrode of reference voltage as negative electrode.
(second embodiment)
In a second embodiment, although it with precharge after, and then in each scanning group, at first select and green (G) corresponding sweep trace, per two frame periods change and red (R) corresponding sweep trace and identical with turntable driving first embodiment in proper order of indigo plant (B) corresponding sweep trace.But with red (R) corresponding sweep trace and with the selecting sequence of blue (B) corresponding sweep trace can per two level periods and per two frame periods change.
Fig. 7 is the concept map that the method for the liquid crystal cells 9 that is used for driving second embodiment is shown.At (4j-3) individual frame period and ensuing (4j-2) individual frame in the period, according to corresponding to the sweep trace of green (G), corresponding to the sweep trace of red (R) and the sweep trace that drives each scanning group corresponding to the order of the sweep trace of blue (B).More specifically, the scanning sequency of sweep trace Y1 to Y3n is following order, promptly sweep trace Y2, Y1, Y3, Y5, Y4, Y6 ..., Y (3i-1), Y (3i-2), Y3i ..., Y (3n-1), Y (3n-2) and Y3n.
On the other hand, at ensuing (4j-1) individual frame period and ensuing again 4j frame in the period, according to corresponding to the sweep trace of green (G), corresponding to the sweep trace of blue (B) and the sweep trace that drives each scanning group corresponding to the order of the sweep trace of red (R).More specifically, the scanning sequency of sweep trace Y1 to Y3m is following order, promptly sweep trace Y2, Y3, Y1, Y5, Y6, Y4 ..., Y (3j-1), Y3i, Y (3i-2) ..., Y (3n-1), Y3n and Y (3n-2).
The sequential control circuit of data driver IC 3 offers the multiplexer 20 of IC inside and the scan line drive circuit 5 of display panels 2 with switching signal, thereby and the scanning sequency of data-signal and sweep trace is just in time corresponded to each other.In response to switching signal, scan line drive circuit 5 switches corresponding to the sweep trace of red (R) with corresponding to the scanning sequency of the sweep trace of blue (B).Between the shift register parts and output buffer parts of scan line drive circuit 5, by arranging to be used to switch the circuit of realizing being used for the switched scan order from the on-off circuit of the signal of shift register parts.As described below, switch corresponding to the sweep trace of red (R) and be effective for the improvement of colorrendering quality corresponding to the scanning sequency of the sweep trace of blue (B).
With reference to figure 5, colorrendering quality and power consumption in the driving method of second embodiment will be described.The tabulation of " GRB, GBR order " in the table of Fig. 5 is shown and is switched corresponding to the sweep trace of red (R) and the effect of earlier data signal and the current sinking amount in the data line during corresponding to the scanning sequency of the sweep trace of indigo plant (B) when per two frame periods.For example, in order to show raster pattern, it is desirable to drive by voltage V0, V63 and V0 respectively the liquid crystal cells 9 of red (R), green (G) and blue (B).If the scanning sequency of each scanning group is fixed to corresponding to the sweep trace of green (G), corresponding to the sweep trace of red (R) and corresponding to the order of the sweep trace of blue (B), because becoming, the voltage that the influence of earlier data signal is kept by the liquid crystal cells of red (R) makes the brighten V2 of two gray levels of unit so.Because the earlier data signal is the V0 of red (R), so the voltage that is kept by the liquid crystal cells of blue (B) is not affected.On the other hand, when the scanning sequency of all scanning group be fixed to sweep trace corresponding to green (G), corresponding to the sweep trace of blue (B) and corresponding to the order of the sweep trace of red (R), so because the voltage that the influence of earlier data signal causes the liquid crystal cells 9 by blue (B) to keep becomes the corresponding voltage V2 of gray level with two gray levels that brighten, and because the earlier data signal is the V0 of blue (B), so the voltage that is kept by the liquid crystal cells 9 of red (R) is not affected.Therefore, switch corresponding to the sweep trace of red (R) and during corresponding to the scanning sequency of the sweep trace of blue (B), the intrinsic brilliance separately of the liquid crystal cells 9 of the liquid crystal cells 9 of red (R) and indigo plant (B) averages out when per two frame periods.The liquid crystal cells 9 of red (R) gray level that brightens, and the liquid crystal cells 9 of blue (B) gray level that brightens.Therefore, if change corresponding to the sweep trace of red (R) with corresponding to the scanning sequency of the sweep trace of blue (B), the effect of earlier data signal is disperseed (spread out) and colorrendering quality to be modified so.
Equally, when the frame in the GBR order show yellow raster pattern in the period and when the frame of GRB order shows blue or green raster pattern in the period current sinking quantitative change of data-signal be maximum.Switch GRB order and GBR order by per 2 frames, the current sinking quantitative change becomes about 1/2 of reference current amount when showing yellow or blue or green raster pattern.This amount is identical with maximum consumption electric current in the data-signal of row inversion driving.In other words, according to the 3G inversion driving of present embodiment, the maximum consumption magnitude of current is identical with the row inversion driving, and can improve picture quality.
In above-mentioned second embodiment, the scanning sequency of per two frame period switched scan lines.But, can each frame period switched scan order.For example, each frame period is switched the scanning sequency of (4j-3) frame period and 4j frame period, perhaps can each frame period switch the scanning sequency of (4j-2) frame period and (4j-1) frame period.
[the 3rd embodiment]
In the 3rd embodiment, prevented to scan the sweep trace of green (G), red (R) and blue (B) and make their one of scanning period overlapping with another by elder generation, the driving period of the pixel electrode in the liquid crystal cells 9 of red (R) and blue (B) shortens.More specifically, as shown in Figure 8, during period from time t12 to time t13 corresponding to scanning period (period) of the sweep trace Y2 of green (G) from time t11 to time t13 and corresponding to the scanning period (period) of the sweep trace Y1 of red (R) from time t12 to time t16 overlapping.Similarly, during period from time t15 to time t16 corresponding to scanning period (period) of the sweep trace Y1 of red (R) from time t12 to time t16 and corresponding to the scanning period (period) of the sweep trace Y3 of blue (B) from time t15 to time t18 overlapping.
In above-mentioned first embodiment, the driving period TB (period from time t17 to time t19) of the liquid crystal cells 9 of the driving period TR (period from time t14 to time t17) of the liquid crystal cells 9 of the driving period TG of the liquid crystal cells 9 of green (G) (period from time t11 to time t14), red (R) and blue (B) has identical length.Yet in the 3rd embodiment, the length that drives period TG, TR and TB is can one different with another.For example, the length of driving period TG, TR and TB can be TG＞TR=TB, TG＞TR＞TB, TG＜TR=TB, TR＞TG＞TB or the like.In Fig. 8, the driving period TG of the liquid crystal cells 9 of green (G) is set to be longer than driving period TR, the TB of the liquid crystal cells 9 of red (R) and blue (B).
Will overlapping sequential be described with reference to the sequential chart of figure 9.Be caught when overlapping when the scanning period of the sweep trace of green (G), red (R) and blue (B), the coupled noise of sweep trace in data line, occurs coming from.If the period from time t12 to time t13 is too short, so owing to can not assemble noise, so liquid crystal cells 9 shows the demonstration lack of uniformity.Yet, if the period that overlaps is oversize, colorrendering quality deterioration so.At (voltage V32 and its near) near the intermediate grey scales, if the variation of the direction of the variation of the voltage of pixel electrode 8 is so easily recognized luminance difference up to reaching intermediate grey scales.Therefore, expectation is that at time t14, overlapping period is provided so that 1/4 to 1/3 gray level that the voltage of pixel electrode 8 can become maximum grey is to be no more than near about intermediate grey scales (voltage V16 is to voltage V22 or its).In the 3rd embodiment and since with first embodiment relatively, the pixel electrode 8 of the liquid crystal cells 9 of red (R) and blue (B) write the period can be caught elongated, so can improve the colorrendering quality of red (R) and indigo plant (B).
If the scanning period of the sweep trace Y5 of the scanning period of the sweep trace Y3 of the indigo plant of first scanning group (B) and green (G) of second scanning group is caught overlapped, the pixel electrode quilt of so green (G) (preliminarily) in advance is charged to opposite polarity, thereby deterioration colorrendering quality, because the polarity difference of data-signal.Therefore, the overlapping of period that comprises the wherein reversal of poles of data-signal is undesired.
When coupled noise is slowly assembled and occurred showing when unbalanced, undesirablely be that it is overlapping that the scanning period of the sweep trace of green (G), red (R) and blue (B) is caught one and another.What more want is, the driving period TR and the TB that prolong red (R) and blue (B) make the length that drives period TG, TR and TB can keep concerning TG＜TR=TB, thereby and improves the colorrendering quality of red (R) and indigo plant (B).
Perhaps, the length of driving period TG, TR and TB is adjusted to and makes opening relationships TR＞TG＞TB also be fine.As this example, expectation be driving period of red (R) just to be prolonged change the gamma curve required time.Data line is precharged to the setting of finishing in period of GND the gamma curve of green (G) of grayscale voltage generative circuit 55 and 65 therein.
[the 4th embodiment]
As shown in Figure 10 A, in the 4th embodiment, the liquid crystal cells 9 that is connected to the centre scan line of each scanning group and is connected to data line Xk be provided at respect to data line Xk be connected to another sweep trace of scanning group and be connected on the opposite side of liquid crystal cells 9 of same data line Xk.Liquid crystal cells 9 conductively-closed light on the right side of liquid crystal cells 9 on the left side of left end data line X1 and right-hand member data line Xm, and these liquid crystal cells 9 are as the dummy argument unit (dummy cell) that in fact is not used in demonstration.The dummy argument unit is provided so that the stray capacitance of data line X1 and data line Xm equals the stray capacitance of (equalize) other data line.
In the example of Figure 10 A, the liquid crystal cells 9 of green (G) about described data line bit on the opposite side of the liquid crystal cells 9 of red (R) that be connected to same data line and blue (B).By the TFT on the left side that is arranged at data line Xk 7, the pixel electrode 8 of liquid crystal cells 9 that is connected to data line Xk red (R) and blue (B) is provided with data-signal.On the other hand, by the TFT on the right side that is arranged at data line Xk 7, the liquid crystal cells 9 that is connected to data line Xk green (G) is provided with data-signal.In other words, by the TFT on the right side that is arranged at data line Xk 7, the liquid crystal cells 9 that is connected with the sweep trace Y (3i-1) of i scanning group is provided with data-signal.On the other hand, by the TFT on the left side that is arranged at data line Xk 7, the liquid crystal cells 9 that is connected with Y3i with sweep trace Y (3i-2) is provided with data-signal.In the 4th embodiment, transform driving if carry out 3G similarly with first embodiment, put inversion driving so and can be carried out similarly, and therefore improved picture quality.By the TFT on the right side that is arranged at data line Xk 7, data-signal can be offered the liquid crystal cells 9 of red (R) and blue (B) that be connected to data line Xk, and data-signal can be offered the liquid crystal cells 9 of green (G) that be connected to same data line Xk by the TFT on the left side that is arranged at data line Xk.
Even the order of the color of colored filter is not RGB but among RBG, GRB, GBR, BRG or the BGR any one, what need so is, the sweep trace that is connected to the center that is positioned at each scanning group only is provided and is connected to the liquid crystal cells 9 of data line Xk, it is positioned on the opposite side of another sweep trace that is connected to scanning group and the liquid crystal cells 9 that is connected to data line Xk about data line Xk.Yet, in any arrangement of the color of colored filter, after precharge, and then in each scanning group, at first select the liquid crystal cells 9 of green (G).
Figure 10 B illustrates the layout of liquid crystal cells.Sweep trace Y of Yan Shening and auxiliary capacitance line 6 are formed on in one deck in the horizontal direction.The data line X of Yan Shening is formed on the upper strata of the layer that wherein forms sweep trace Y and auxiliary capacitance line 6 in vertical direction.And at the layer identical with the data line that is used for each liquid crystal cells 9, the second auxiliary capacitance line (not shown) is provided between sweep trace Y and the pixel electrode 8, to have capacitive function and function of shielding.Auxiliary capacitor is formed between the pixel electrode 8 and second auxiliary capacitance line.For each liquid crystal cells 9, auxiliary capacitance line 6 can extend on direction identical with data line X and vertical direction, and second auxiliary capacitance line can be in the horizontal direction from auxiliary capacitance line branch.
[the 5th embodiment]
In first to fourth embodiment, the scanning sequency of the sweep trace in each scanning group is that and then the order of G sweep trace (first sweep trace), R sweep trace (second sweep trace) and B sweep trace (three scan line) is (hereinafter after precharge, be called as the GRB order), the perhaps order of G sweep trace (first sweep trace), B sweep trace (second sweep trace) and R sweep trace (three scan line) (hereinafter, be called as GBR order).In the fifth embodiment of the present invention, mix GRB order and GBR order in the period at a frame.Will be by can be by reverse TFT and the combination the 4th embodiment of liquid crystal cells 9 of center of each scanning group of showing of 3G inversion driving on schedule, i.e. arrangement in the diverse location is described the 5th embodiment as example.
The combination of six kinds of scanning sequencies below existing, wherein a frame in the period each or two level periods (that is, per three or six scanning periods) or each or two frame periods mix GRB order and GBR order:
(I) each level period (Figure 11),
(II) each level period and each frame period (Figure 12),
(III) each level period and per two frame periods (Figure 13),
(IV) per two level periods,
(V) per two level periods and each frame period, and
(VI) per two level periods and per two frame periods.
In the scanning sequency shown in Figure 11 (I), drive the scanning group of odd-numbered and drive the scanning group of even-numbered with the GBR order with the GRB order.In other words, the order of the color in the liquid crystal cells is that G → R → B → G → B → R and this are repeated in proper order.According to this scanning sequency, wherein because the current sinking amount that causes of data-signal is peaked pattern is blue or green and yellow water riglet pattern and current sinking amount are 2/3 of reference current amounts.Like this, can change the pattern that is used for the maximum consumption magnitude of current by the switched scan order.At the display pattern that is used for the maximum consumption magnitude of current, the temperature of data driver IC 3 uprises.If the condition of high temperature last very long of data driver IC 3 exists so because driving force reduces the possibility that causes image quality decrease.Therefore, expectation is that the frequency of occurrences that is used for the display pattern of the maximum consumption magnitude of current is suppressed to lower.By the polarity of voltage of liquid crystal cells 9, the picture quality in the line inversion driving (line) is higher than the picture quality in the frame inversion driving (face).Therefore, by for each scanning group changes the color that is subjected to the earlier data effect of signals, can from the face to the line, disperse the influence of earlier data.It should be noted that scanning sequency can be G → B → R → G → R → B, wherein drive the scanning group of odd-numbered and drive the scanning group of even-numbered with the GRB scanning sequency with the GBR scanning sequency.
In the scanning sequency shown in Figure 12 (II), at (2j-1) frame in the period, drive the scanning group of odd-numbered and drive the scanning group of even-numbered with the GBR order with the GRB scanning sequency.In other words, the order of the color of driven liquid crystal cells is G → R → B → G → B → R, identical with the scanning sequency of Figure 11.The pattern that is used for the maximum consumption magnitude of current under the supposition liquid crystal is normal black situation is the horizontal stripe pattern under the blue or green and yellow order.Yet, in the 2j frame period, drive the scanning group of odd-numbered and drive the scanning group of even-numbered with the GRB order with the GBR order.In other words, the order of the color of the liquid crystal cells that be shown is G → B → R → G → R → B.Maximum consumption magnitude of current pattern is the horizontal stripe pattern under the order of Huang Heqing.
In the scanning sequency shown in Figure 13 (III), the order of the color of the liquid crystal cells that will be shown in the period at (4j-3) and (4j-2) frame is G → R → B → G → B → R.At the supposition liquid crystal is that maximum consumption magnitude of current pattern is a horizontal stripe pattern under the blue or green and yellow order under the normal black situation.Order in the color of (4j-1) and the liquid crystal cells that will be shown in the 4j frame period is G → B → R → G → R → B.Maximum consumption magnitude of current pattern becomes the horizontal stripe pattern under the yellow and blue or green order.
According to the scanning sequency of Figure 12 and Figure 13, switched scan order as follows, each or two frame maximum consumption magnitude of current pattern differences, and as this result, the maximum consumption magnitude of current can be caught to be about 1/2 of reference current amount.Equally, can on time and space, disperse the influence of earlier data signal by change scanning sequency in each scanning group for each scanning group and each frame period.
Scanning sequency (IV), (V) and description (VI) are with identical by scanning sequency (I), (II) and the description (III) of switching GRB scanning sequency and GBR scanning sequency for per two level periods.Therefore, omitted description.Figure 14 is illustrated in the table of the scanning sequency in the modification of scanning sequency (V).First and second scanning group of (4j-3) frame in the period are that the GRB scanning sequency and third and fourth scanning group are the GBR scanning sequencies.Maximum consumption magnitude of current pattern in such cases is blue or green, blue or green, yellow, yellow horizontal stripe pattern.First and second scanning group of (4j-2) frame in the period are that the GBR scanning sequency and third and fourth scanning group are the GRB scanning sequencies.Maximum consumption magnitude of current pattern in such cases is yellow, yellow, blue or green, blue or green horizontal stripe pattern.(4j-1) frame first in period and the 4th scanning group are that GRB scanning sequency and the second and the 3rd scanning group are the GBR scanning sequencies.Maximum consumption magnitude of current pattern in such cases is blue or green, yellow, yellow, blue or green horizontal stripe pattern.The first and the 4th scanning group of 4j frame period is that GBR scanning sequency and the second and the 3rd scanning group are the GRB scanning sequencies.Maximum consumption magnitude of current pattern in such cases is yellow, blue or green, blue or green, yellow horizontal stripe pattern.Like this, can per two scanning group switch (give way) GRB order or GBR order.
[the 6th embodiment]
The 6th embodiment is different from the first embodiment part and is two data lines to be provided and to have selected two sweep traces simultaneously for row.Yet the number of the liquid crystal cells that is connected with a data line is 3n/2, and this number is half of number (the perhaps number of sweep trace) 3n that is used for the liquid crystal cells of row.Here n is 2 multiple.Compare with first to the 5th embodiment of the present invention, the number of data line increases to twice.Yet, owing in a scanning period, can select two sweep traces simultaneously, so one scans the period becomes twice and can bring up to the data-signal of pixel electrode on length write time.
Equally, in the present embodiment, the group that exposes thoroughly is made up of six continuously arranged sweep traces.Six continuous sweep traces from sweep trace Y1 to sweep trace Y6 are called as first scanning group.Six continuous sweep traces from sweep trace Y7 to sweep trace Y12 are called as second largest scanning group.Hereinafter, in the same manner, six sweep traces from sweep trace Y (6i-5) to sweep trace Y6i are called as the i group that exposes thoroughly.Here, i is a natural number.When display panels 2 had number with the corresponding pixel of WXGA, i was from 1 to 384 integer.In the present embodiment according to first scanning group, second largest scanning group ..., (n/2) expose thoroughly the group the select progressively sweep trace.It should be noted that scanning group and the relation that exposes thoroughly between the group represent that first and second scanning group are that the first scanning group and third and fourth scanning group are second largest scanning group.
Next, will annexation between each liquid crystal cells 9 and the data line be described with reference to Figure 15.At first, will describe liquid crystal cells 9 first row with data line X1 and X2 between be connected.In first scanning group, the R liquid crystal cells of first row, the B liquid crystal cells of the third line, the G liquid crystal cells of fifth line are connected with data line X1, and second capable G liquid crystal cells, the R liquid crystal cells of fourth line, the 6th B liquid crystal cells of going is connected with data line X2.In second largest scanning group, the B liquid crystal cells of the R liquid crystal cells of the 7th row, the 9th row, the G liquid crystal cells of the tenth delegation are connected with data line X2 and G liquid crystal cells, the R liquid crystal cells of the tenth row, the 12 B liquid crystal cells of going of the 8th row are connected with data line X1.The row of the tenth triplex row and back is connected with X2 with data line X1 in the mode identical with the first to the 12 row.Equally, the liquid crystal cells 9 in the row of secondary series and back is connected in the mode identical with first row.Although do not illustrate, annexation is opposite in the row of the row of odd-numbered and even-numbered.
In the present embodiment, all data line X1 to X2m are precharged to predetermined reference voltage in the blank period of two level periods.Just after precharge, the selected and data-signal of G sweep trace is provided for the G liquid crystal cells.Here, select two sweep traces simultaneously.Equally, be that unit controls each control signal with two level periods.For example, generate latch signal STB for per two level periods.A scanning period approximately is 2/3 of the level period, and two level periods were made up of blank period and three scanning periods.
Next, the scanning sequency of sweep trace will be described.At first select G sweep trace Y2 and Y5 in the period during beginning simultaneously one or two level period at (4j-3) and (4j-2) individual frame.Next, select R sweep trace Y1 and B sweep trace Y6 simultaneously.Then, select B sweep trace Y3 and R sweep trace Y4 simultaneously.Next, when the beginning of the second two level periods, select G sweep trace Y8 and Y11 simultaneously.Next, select R sweep trace Y7 and B sweep trace Y12 simultaneously.Then, select B sweep trace Y9 and R sweep trace Y10 simultaneously.Only note the color of liquid crystal cells, the first and second above-mentioned scanning sequencies that expose thoroughly in organizing are GG → RB → BR → GG → RB → BR.
Select G sweep trace Y2 and Y5 in period during beginning simultaneously at (4j-1) and 4j frame one or two level period.Next, select B sweep trace Y3 and R sweep trace Y4 simultaneously.Then, select R sweep trace Y1 and B sweep trace Y6 simultaneously.Next, when the beginning of the second two level periods, select G sweep trace Y8 and Y11 simultaneously.Next, select B sweep trace Y9 and R sweep trace Y10 simultaneously.Then, select R sweep trace Y7 and B sweep trace Y12 simultaneously.Only note the color of liquid crystal cells, first and second scanning sequencies that expose thoroughly in organizing are GG → BR → RB → GG → BR → RB.According to the scanning sequency of Figure 15, select the G sweep trace in the same group that exposes thoroughly simultaneously, and select the R sweep trace and the B sweep trace of the different scanning group in the same group that exposes thoroughly simultaneously.Described in first embodiment, the gamma curve that is used for red (R) and the liquid crystal cells 9 of blue (B) is identical and therefore can selects R liquid crystal cells and B liquid crystal cells simultaneously.
But Figure 15 does not illustrate the polarity of voltage of each the frame period shown in Figure 13 the polarity of voltage difference of each each liquid crystal cells 9 of frame period, the same with among Figure 13.Polarity of voltage for per two level periods and each frame period inverted data signal.Figure 16 illustrates the scanning sequency except the scanning sequency of Figure 15.It should be noted that the scanning sequency of Figure 15 is as shown in the row (a) of Figure 16.
The difference of the scanning sequency of the row (a) of the scanning sequency of the row of Figure 16 (b) and Figure 16 is the scanning sequency in second largest scanning group.Only note the color of liquid crystal cells, the scanning sequency that (4j-3) and (4j-2) frame first and second in period expose thoroughly in organizing is GG → RB → BR → GG → BR → RB.(4j-1) and the scanning sequency in the 4j frame period are GG → BR → RB → GG → RB → BR.
In the row (c) and scanning sequency (d) of Figure 16, select to be used for the sweep trace of same color simultaneously.Only note the color of liquid crystal cells, (4j-3) and (4j-2) individual frame be in the period, first and second scanning sequencies that expose thoroughly group, and the row of Figure 16 (c) scanning sequency is GG → RR → BB → GG → BB → RR.(4j-1) and the scanning sequency in the 4j frame period are GG → BB → RR → GG → RR → BB.
In the scanning sequency of the row (d) of Figure 16, the scanning sequency of first scanning group is identical with the scanning sequency of second largest scanning group.In other words, the scanning sequency of a frame period is identical in each group that exposes thoroughly.Only note the color of liquid crystal cells, (4j-3) and (4j-2) frame in the period first and second scanning sequencies that expose thoroughly group are GG → RR → BB → GG → RR → BB.(4j-1) and the scanning sequency in the 4j frame period are GG → BB → RR → GG → BB → RR.
The switching of scanning sequency of row (a) and (b), (c), (d) of per two frame period Figure 16 has mainly been described.Yet the scanning sequency shown in the image pattern 12 is the same, can be for each frame period switched scan order.In other words, can carry out the scanning sequency of above-mentioned (4j-3) individual frame period for each frame period.
According to the 3G inversion driving in the present embodiment, even scanning sequency is in the row (a) and (b), (c), (d) of Figure 16 any one, because the maximum consumption magnitude of current that causes of data-signal is the about 1/2 of reference current amount, and can make the maximum consumption magnitude of current approximately identical with the maximum consumption magnitude of current in the row inversion driving.From the viewpoint of the influence that disperses the earlier data signal, the scanning sequency of Figure 15, that is, the scanning sequency of the row of Figure 16 (a) is the most desirable in four scanning sequencies because between the scanning group of the scanning group of odd-numbered and even-numbered the scanning sequency difference.In the scanning sequency of the row (b) of Figure 16, because the scanning sequency of second scanning group and the 3rd scanning group is identical, therefore two continuous pixels ground receives the influence to the earlier data signal of same color.
Data driver IC 3 is for the polarity of per two level periods and a frame period inverted data signal.Equally, in (perhaps even-numbered) two levels of odd-numbered in the period, the positive polarity data-signal is output to data line X1 and data line X2 and negative polarity data-signal and is output to data line X2 and data line X3.In period, data-signal is inverted in (perhaps odd-numbered) two levels of even-numbered, and the negative polarity data-signal is output to data line X1 and data line X4 and positive polarity data-signal and is output to data line X2 and data line X3.Owing between data line X2, data line X3, have stray capacitance, in the data-signal except data-signal, can reduce consumed current amount between the data line that causes owing to stray capacitance with identical polar with opposite polarity.
Equally, data driver IC 3 comprises that latch cicuit 11 and 12 can latch the view data that is used for two level periods (being used for 6 sweep traces) thus.Consider sample latch, data driver IC 3 can latch the view data that is used for four level periods.By control view data is offered the multiplexer 20 of sample latch or the change of data buffer carries out image data.The signal that the data in the register is set or is provided to input terminal based on data driver IC 3 or scan line drive circuit 5 is determined to carry out the sort of scanning sequency.
Figure 17 illustrates the data-signal of first and second levels in the period and the sequential chart of sweep signal of (4j-3) the frame period in the scanning sequency shown in Figure 15.In the blank period of two first level periods, every data line is precharged to reference voltage.Then, select G sweep trace Y2 and Y5 simultaneously, green positive polarity data-signal is provided for data line X1 and X4 and green (G) negative polarity data-signal and is provided for data line X2 and X3.Next, select B sweep trace Y3 and R sweep trace Y4 simultaneously, red (R) positive polarity data-signal is provided for data line X1, and blue (B) negative polarity data-signal is provided for data line X2, and red (R) negative polarity data-signal is provided for data line X3 and indigo plant (B) positive polarity data-signal is provided for data line X4.Next, select R sweep trace Y1 and B sweep trace Y6 simultaneously, blue (B) positive polarity data-signal is provided for data line X1, red (R) negative polarity data-signal is provided for data line X2, and blue (B) negative polarity data-signal is provided for data line X3 and red (R) positive polarity data-signal is provided for data line X4.
In the blank period of ensuing the second two level periods, every data line is precharged to reference voltage.Then, select G sweep trace Y8 and Y11 simultaneously, green (G) negative polarity data-signal is provided for data line X1 and X4, and green (G) positive polarity data-signal is provided for data line X2 and X3.Next, select R sweep trace Y7 and B sweep trace Y12 simultaneously, and blue (B) negative polarity data-signal is provided for data line X1, red (R) positive polarity data-signal is provided for data line X2, and blue (B) positive polarity data-signal is provided for data line X3 and red (R) negative polarity data-signal is provided for data line X4.Next, select B sweep trace Y9 simultaneously, with R sweep trace Y10, and red (R) negative polarity data-signal is provided for data line X1, blue (B) positive polarity data-signal is provided for data line X2, red (R) positive polarity data-signal is provided for data line X3, and blue (B) negative polarity data-signal is provided for data line X4.Omit the description of operation after this, but for the polarity of each a level period and a frame period inverted data signal, to realize the 3G inversion driving.According to the scanning sequency shown in Figure 15, because the color of earlier data effect of signals is different in the scanning group of the scanning group of odd-numbered and even-numbered, so the influence of earlier data signal can be disperseed.
[the 7th embodiment]
At first to the 6th embodiment of the present invention, three sweep traces of placing continuously are set to a scanning group.In the 7th embodiment, each bar wherein is that three sweep traces of one in per two lines are set to a scanning group.Particularly, empty (virtual) sweep trace Y (1) and sweep trace Y1 and Y3 belong to scanning group a.Sweep trace Y2, Y4 and Y6 belong to scanning group b.Sweep trace Y5, Y7 and Y9 belong to scanning group c.Sweep trace Y8, Y10 and Y12 belong to scanning group d.Sweep trace Y11, Y13 and Y15 belong to scanning group e.Empty sweep trace Y (1) can be a sweep trace non-existent and that can exist as dummy argument (dummy) sweep trace Y0 and Y (1) by light shield.
Sharp as first to the 6th enforcement of the present invention, data line X1 to Xm is precharged to predetermined reference voltage when the beginning of a level period, then, drives the G liquid crystal cells that is connected with the G sweep trace.And, the scanning sequency of scanning group be according to scanning group a, b, c, d, e ... order.
Figure 18 and Figure 19 will be described.In period, data-signal is provided for the liquid crystal cells 9 of scanning group a in first level of (4j-3) frame period.Every data line is precharged to reference voltage when the beginning of the first level period.After precharge, and then select the dummy data signal of empty sweep trace Y (1) and positive polarity to be provided for the data line X (2k-1) of odd-numbered and the data line X2k that negative polarity dummy data signal is provided for even-numbered.Next, select R sweep trace Y1, and according to the view data of red (R), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.Next, select B sweep trace Y3, and according to the view data of blue (B), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.
Next, in the period, data-signal is provided for the liquid crystal cells of scanning group b in second level.When the beginning of the second level period, carry out the precharge of reference voltage.After precharge, and then select G sweep trace Y2, and according to the view data of green (G), the negative polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the positive polarity data-signal is provided for even-numbered.Next, select B sweep trace Y6, and according to the view data of blue (B), the negative polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the positive polarity data-signal is provided for even-numbered.Next, select R sweep trace Y4, and according to the view data of red (R), the negative polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the positive polarity data-signal is provided for even-numbered.
Next, in the period, data-signal is provided for the liquid crystal cells of scanning group c in the 3rd level.When the beginning of the 3rd level period, carry out the precharge of reference voltage.After precharge, and then select G sweep trace Y5, and according to the view data of green (G), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.Next, select R sweep trace Y7, and according to the view data of red (R), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.Next, select B sweep trace Y9, and according to the view data of blue (B), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.After this, in the period,, carry out driving operation in the level of the 4th level period and back as the second and the 3rd level period.
At (4j-2) frame in the period, drive liquid crystal cells with the scanning sequency identical with (4j-3) frame period, the polarity of voltage that difference is to be provided for the data-signal of liquid crystal cells is inverted.
At (4j-1) frame in the period, will switch to (4j-3) frame period corresponding to the scanning sequency of the sweep trace of red (R) and blue (B).Equally, the polarity of voltage that is provided for the data-signal of liquid crystal cells is inverted.Particularly, when the beginning of the first level period, carry out the precharge of reference voltage.After precharge, and then select empty sweep trace Y (1), and positive polarity dummy data signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that negative electrode dummy data signal is provided for even-numbered.Next, select B sweep trace Y3, and according to the view data of blue (B), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.Next, select R sweep trace Y1 and according to the view data of red (R), the positive polarity data-signal is provided to the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.
Next, in the period, data-signal is provided for the liquid crystal cells of scanning group b in second level.When the beginning of the second level period, carry out the precharge of reference voltage.After precharge, and then select G sweep trace Y2, and according to the view data of green (G), the negative polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the positive polarity data-signal is provided for even-numbered.Next, select R sweep trace Y4, and according to the view data of red (R), the negative polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the positive polarity data-signal is provided for even-numbered.Next, select B sweep trace Y6, and according to the view data of blue (B), the data-signal that the negative polarity data-signal is provided for the data line X (2k-1) of odd-numbered and positive polarity is provided for the data line X2k of even-numbered.
Next, in the period, data-signal is provided for the liquid crystal cells of scanning group c in the 3rd level.When the beginning of the 3rd level period, carry out the precharge of reference voltage.After precharge, and then select G sweep trace Y5, and according to the view data of green (G), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.Next, select B sweep trace Y9, and according to the view data of blue (B), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.Next, select R sweep trace Y7, and according to the view data of red (R), the positive polarity data-signal is provided for the data line X (2k-1) of odd-numbered and the data line X2k that the negative polarity data-signal is provided for even-numbered.After this, in second and three level period identical mode drive liquid crystal cells with subsequent horizontal in the period in the 4th level period.
In the 4j frame period, drive liquid crystal cells with the scanning sequency identical with (4j-1) frame period, the polarity of voltage that just is provided for the data-signal of liquid crystal cells is inverted.
Compare with first embodiment or the like, in the present embodiment, in order to drive the empty sweep trace (1) among the first scanning group a, the elongated level period of the driving period of frame in the period.
By carrying out the 3G inversion driving, can obtain the counter-rotating of pseudo-point and show according to above-mentioned scanning sequency.
It should be noted, can make up the technology of first to the 7th embodiment in the combination in any mode.The combination of the combination of the combination of the technology of for example, the combination of the technology of first, second and the 3rd embodiment, first, second and the 4th embodiment, the technology of first to fourth embodiment, the technology of the 3rd to the 5th embodiment is possible.The combination of the technology of the combination of the technology of the 3rd and the 6th embodiment and the 5th and the 6th embodiment can be used.
Although having supposed liquid crystal is to have described embodiment normal deceiving, liquid crystal also can be Chang Bai.In addition, the present invention can also be applicable to the display device of the use display panel except liquid crystal indicator.For example, the present invention can also be applied to organic EL display, wherein replaces liquid crystal cells 9 with organic EL unit.Under these circumstances, at the pixel electrode of organic EL unit with between its public electrode, fill organic EL Material.When the present invention is implemented as organic EL display, can realize organic EL unit of red (R), green (G) and blue (B) by the organic EL unit emission white light that is coated with colored filter.Perhaps, also can use organic EL unit of the light of each color of launching red (R), green (G) and blue (B), rather than use organic EL unit of colored filter.
In addition, can also use color system except the RGB color system as the color system of display panel.Under these circumstances, after precharge, and then drive and the corresponding display unit of color (liquid crystal cells 9 or organic EL unit) of high spectral luminous efficacy, and with other display unit of rear drive.
Although described the present invention in the above in conjunction with some embodiment, but it will be evident to one skilled in the art that, those embodiment only are provided for the present invention is shown, and should explain claim of the present invention in limiting sense based on those embodiment.

Claims (13)

1. method that drives display panel, described display panel comprises: comprise first to first scanning group of three scan line and with described first many data lines that intersect to three scan line, wherein a plurality of first display units of first color that is connected with described first sweep trace; A plurality of second display units of second color that is connected with described second sweep trace; A plurality of the 3rd display units of the 3rd color that is connected with described three scan line, described method comprises:
In period described data line is pre-charged to predetermined voltage in first level; And
Described first level in the period after the described data line of precharge, by the described data line that drives described first to the 3rd display unit data-signal is offered described first to the 3rd display unit,
Wherein in the described driving of described first to the 3rd display unit, at first drive in described first to the 3rd display unit with described first to the 3rd color in have a corresponding display unit of color of maximum spectral luminous efficacy.
2. the method for driving display panel according to claim 1, wherein said display panel further comprises:
Second scanning group that comprises the 4th to the 6th sweep trace, wherein contiguous described first scanning group provides described second scanning group,
A plurality of the 4th display units of described first color, a plurality of the 4th display units of described first color are connected with described the 4th sweep trace;
A plurality of the 5th display units of described second color, a plurality of the 5th display units of described second color are connected with described the 5th sweep trace; And
A plurality of the 6th display units of described the 3rd color, a plurality of the 6th display units of described the 3rd color are connected with described the 6th sweep trace,
Wherein said method comprises
In period, described data line is pre-charged to described predetermined voltage in second level subsequently of the described first level period; And
In period after the described data line of precharge, data-signal is offered described the 4th to the 6th display unit in described second level by the described data line that drives described the 4th to the 6th display unit,
Wherein in the described driving of described the 4th to the 6th display unit, at first drive in described the 4th to the 6th display unit with described first to the 3rd color in have a corresponding display unit of color of described maximum spectral luminous efficacy, and
The polarity of described data-signal that is provided for described first to the 3rd display unit that is connected with first data line of described data line is opposite with the polarity of the described data-signal that is provided for described the 4th to the 6th display unit that is connected with described first data line.
3. the method for driving display panel according to claim 1 further comprises:
First driving order and second driving order are set; With
Switch described first driving order and described second driving order for each scheduled time slot,
Wherein in described first driving order, according to driving described first to the 3rd display unit with the order that has in the corresponding display unit of color of described maximum spectral luminous efficacy, described first to the 3rd display unit display unit remaining described in one of described color with except color corresponding another display unit and described first to the 3rd display unit in described first to the 3rd display unit with described maximum spectral luminous efficacy, and
In described second driving order, according in described first to the 3rd display unit with have the corresponding display unit of described color of described maximum spectral luminous efficacy, described remaining display unit and the order of described another display unit and drive described first to the 3rd display unit.
4. the method for driving display panel according to claim 3, wherein said predetermined periods are one or two level periods or one or two frame periods.
5. according to the method for any one the described driving display panel in the claim 1 to 4, wherein between described first sweep trace and described three scan line, provide described second sweep trace,
One in described first to the 3rd display unit and the described data line is connected, and
Described second display unit about described data line bit in described first and the opposite side of the 3rd display unit.
6. according to the method for any one the described driving display panel in the claim 1 to 4, wherein from green, redness and blueness, select described first color, described second color and described the 3rd color so that described first color, described second color, described the 3rd color differ from one another.
7. display device comprises:
Data driver;
Display panel; And
Scan line driver circuit,
Wherein said display panel comprises:
Comprise first first scanning group to three scan line;
Many data lines, described many data lines intersect to three scan line with described first,
A plurality of first display units of first color, a plurality of first display units of described first color are connected with described first sweep trace;
A plurality of second display units of second color, a plurality of second display units of described second color are connected with described second sweep trace; And
A plurality of the 3rd display units of the 3rd color, a plurality of the 3rd display units of described the 3rd color are connected with described three scan line,
At data driver described in the first level period described data line is pre-charged to predetermined voltage, and in described first level in the period after the described data line of precharge, described data driver offers described first to the 3rd display unit to drive described first to the 3rd display unit by described data line with data-signal
Wherein said scan line driver circuit at first drives described first and have a corresponding sweep trace of color of maximum spectral luminous efficacy to the three scan line with in described first to the 3rd color.
8. display device according to claim 7, wherein said display panel further comprises:
Second scanning group that comprises the 4th to the 6th sweep trace, wherein contiguous described first scanning group provides described second scanning group,
A plurality of the 4th display units of described first color, a plurality of the 4th display units of described first color are connected with described the 4th sweep trace;
A plurality of the 5th display units of described second color, a plurality of the 5th display units of described second color are connected with described the 5th sweep trace; And
A plurality of the 6th display units of described the 3rd color, a plurality of the 6th display units of described the 3rd color are connected with described the 6th sweep trace,
Wherein described data line is pre-charged to described predetermined voltage at data driver described in the second level period subsequently described first level period, and in described second level in the period after the described data line of precharge, described data driver offers described the 4th to the 6th display unit by the described data line that drives described the 4th to the 6th display unit with data-signal
Wherein in the described driving of described the 4th to the 6th display unit, at first drive in described the 4th to the 6th display unit with described first to the 3rd color in have a corresponding display unit of color of described maximum spectral luminous efficacy, and
The polarity of described data-signal that is provided for described first to the 3rd display unit that is connected with first data line of described data line is opposite with the polarity of the described data-signal that is provided for described the 4th to the 6th display unit that is connected with described first data line.
9. display device according to claim 7, the described display unit of wherein said data driver drive make switches first driving order and second driving order for each scheduled time slot,
Wherein in described first driving order, according to driving described first to the 3rd display unit with the order that has in the corresponding display unit of color of described maximum spectral luminous efficacy, described first to the 3rd display unit display unit remaining described in one of described color with except described color corresponding another display unit and described first to the 3rd display unit in described first to the 3rd display unit with described maximum spectral luminous efficacy, and
In described second driving order, according in described first to the 3rd display unit with have the corresponding display unit of described color of described maximum spectral luminous efficacy, described remaining display unit and the order of described another display unit and drive described first to the 3rd display unit.
10. according to any one the described display device in the claim 7 to 9, wherein said scheduled time slot is one or two level periods or one or two frame periods.
11. any one the described display device according in the claim 7 to 9 wherein provides described second sweep trace between described first sweep trace and described three scan line,
One in described first to the 3rd display unit and the described data line is connected, and
Described second display unit about described data line bit in described first and the opposite side of the 3rd display unit.
12. according to any one the described display device in the claim 7 to 9, wherein from green, redness and blueness, select described first color, described second color and described the 3rd color, make described first color, described second color, described the 3rd color differ from one another.
13. a display device comprises:
First to the 6th sweep trace of An Paiing in order;
A plurality of first display units of first color, a plurality of first display units of described first color are connected to described first sweep trace;
A plurality of second display units of second color, a plurality of second display units of described second color are connected to described second sweep trace;
A plurality of the 3rd display units of the 3rd color, a plurality of the 3rd display units of described the 3rd color are connected to described three scan line;
A plurality of the 4th display units of described first color, a plurality of the 4th display units of described first color are connected to described the 4th sweep trace;
A plurality of the 5th display units of described second color, a plurality of the 5th display units of described second color are connected to described the 5th sweep trace;
A plurality of the 6th display units of described the 3rd color, a plurality of the 6th display units of described the 3rd color are connected to described the 6th sweep trace; And
Data line, described data line are arranged to described first to the 6th sweep trace and intersect,
Wherein with described data line in described first to the 6th display unit that is connected in, the described second and the 5th display unit is arranged to about the opposite side of a described data line at described the first, the 3rd, the 4th and the 6th display unit.
CN200910139662A 2008-06-30 2009-06-30 Display panel driving method and display apparatus Pending CN101620841A (en)

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