CN1236415C - Liquid crystal display device - Google Patents
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- CN1236415C CN1236415C CN 02127658 CN02127658A CN1236415C CN 1236415 C CN1236415 C CN 1236415C CN 02127658 CN02127658 CN 02127658 CN 02127658 A CN02127658 A CN 02127658A CN 1236415 C CN1236415 C CN 1236415C
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Abstract
A liquid crystal display device employing an overshooting driving method is provided which is capable of reducing memory capacity of a frame memory used to delay input data. The above liquid crystal display device for displaying an image using a liquid crystal panel includes a data converting table to generate output gray-scale data obtained by thinning out input gray-scale data to reduce a number of bits of input gray-scale data, a frame memory to generate second input gray-scale data by delaying output gray-scale data in a data converting table by one frame image display period in a liquid crystal panel and a look-up table to generate an overshooting gray-scale output being in advance stored according to a relation in size between the first input gray-scale data and the second input gray-scale data, wherein image display is performed by an overshooting gray-scale output in a liquid crystal panel.
Description
Technical field of the present invention
The present invention relates to reduce to overregulate the liquid crystal indicator that mode drives the capacity of the needed frame memory of liquid crystal board.
This part patented claim requires the right of priority of 2001-192076 number of declaring June 25 calendar year 2001 and the 2002-146165 Japanese patent application of declaring on May 21st, 2002, they is incorporated into by quoting as proof at this.
Prior art of the present invention
The light transmittance that constitutes the liquid crystal material of liquid crystal cells is that the molecular orientation that takes place during by extra electric field changes and changes.Image shows it is to be installed in the light source of liquid crystal board behind and to pass through by use liquid crystal board (wherein many small liquid crystal cells that are made of liquid crystal material are arranged on the transparent substrate, and signal voltage can individually be added on each liquid crystal cells) with by use to realize for the transmissivity of each liquid crystal cells control from the light of light source.
But in liquid crystal indicator, the variation of the molecular orientation that takes place when electric field is added on the liquid crystal material is accompanied by time delay, therefore is being accompanied by cumulative effect aspect its luminescence response rate.Therefore, when showing animation, there is such problem, promptly makes the people be difficult to see clearly picture in the delay of image aspect moving.
The effort that improves the display performance of animation is overregulated the driving method by use and is carried out, and in the method, the time of the large-signal voltage that adds is short, drives liquid crystal cells simultaneously, and this causes that the liquid crystal material that is accelerated changes in the orientation of molecule.
Figure 14 is the schematic block diagram of showing with the example that overregulates traditional liquid crystal indicator that mode drives.As shown in figure 14, traditional liquid crystal indicator mainly comprises controller 101, frame memory 102, look-up table 103 and LCD (LCD) 1 04.In addition, in liquid crystal indicator, in the ordinary course of things, provide with the three primary colors that comprise redness (R), green (G) and blueness (B) in every kind of color liquid crystal cells one to one, and the RGB data are sent to every kind of liquid crystal cells with color display, after this in order to simplify the operation that only is described under the monochromatic situation.
For example, input 1 device from the outside of the picture signal that is made of 8 numerical datas (gray-scale value) is fed to controller 101, and the frame memory of transferring to subsequently 102 is preserved a frame time there, then output.Controller 101 is the input 2 that is fed to look-up table 103 from the output conduct of frame memory 102.
On the other hand, input 1 is directly presented to look-up table 103.Look-up table 103 produces to overregulate according to input 1 gray-scale value and input 2 and drives needed output 2 and it is presented to LCD 104.
In LCD 104, pixel capacitors is installed on each point of crossing of data line (row) of the sweep trace (OK) of a plurality of horizontal directions and a plurality of vertical direction.It has be used for the driven sweep line the scan line drive circuit (not shown) and be used for the data line drive circuit (not shown) of driving data lines.Make sweep trace on every row by continuous drive from the sweep signal source of scan line drive circuit according to the synchrodata of coming self-controller 101, and the data signal source that data line drive circuit is supplied with every data line is according to synchrodata of coming self-controller 101 and the data line that whenever lists from the gray-scale value continuous drive of the output 2 of look-up table 103.Image shows and to be achieved in that when the grid that is connected on the TFT (thin film transistor (TFT)) between each pixel capacitors and every the corresponding data line relies on sweep signal from sweep trace to be switched on, according to the voltage change optical transmission rate from the data-signal of corresponding data line.
In this point, overregulate driving in order to finish, produce the output 2 that gray-scale value is overregulated in conduct in the frame time of look-up table 103 after the gray-scale value that changes input 1 according to input 1 and the gray-scale value of importing 2.In other words, look-up table 103 is preestablished certain value like this, so that when the gray-scale value of input 1 equals to import 2 gray scale, this gray-scale value is output as output 2, but when input 2 gray-scale value during less than the gray-scale value of input 1, the output 2 with gray-scale value bigger than the gray-scale value of input 2 is used as overregulates gray-scale value output, and, export of the output 2 of its gray-scale value less than the gray-scale value of input 2 when input 2 gray-scale value during greater than the gray-scale value of input 1.
The function of overregulating driving is described with reference to Figure 15.When the gray-scale value during frame F1 in the input 1 does not change, owing in input 2, do not change as yet, input 1 is identical with the signal level of input 2 in look-up table 103, so the gray-scale value of input 1=input 2=D1 is as importing 2 from look-up table 103 outputs.During subsequent frame F2, when input 1 gray-scale value when D1 changes to D2, because the gray-scale value D1 of input 2 remains unchanged, to the input 1 of look-up table 103＞to the input 2 of look-up table 103, so the value D0 that overregulates that stores in advance is corresponding to the output of importing 1 gray-scale value D1, and import 2 gray-scale value D2 as output 2 from look-up table 103 outputs, this makes to overregulate to drive and is accomplished.
In subsequent frame F3, because the gray-scale value of input 2 becomes D2, the gray-scale value of input 1=input 2=D2 is as exporting 2 from look-up table 103 outputs.The data-signal that is used for corresponding pixel capacitors is added to LCD 104 according to the gray-scale value from look-up table 103, at this moment, the brightness of LCD 104 changes by this way, thus it during the frame F1 corresponding to the brightness L1 of gray-scale value D1 during the frame F2 according to overregulating gray-scale value D0 experience instantaneous variation and during frame F3, becoming brightness L2 corresponding to gray-scale value D2.
Now, if suppose in Figure 14, not have look-up table 103 and LCD 104 directly to be imported 1 to drive, as what in Figure 15, point out with fracture line, the gray-scale value that plan is presented to the output 2 of LCD104 directly becomes " D2 " during frame F2, but, because delay in the operation of liquid crystal cells, as in Figure 15, pointing out that with another fracture line the brightness of LCD 104 is risen lentamente from brightness L1.
Otherwise, adopt and to overregulate when driving, as point out with solid line that in Figure 15 the brightness of LCD104 is risen from the brightness L1 corresponding to gray-scale value D1 precipitously, the brightness corresponding to gray-scale value D2 becomes " L2 " then, therefore improved the delay of image demonstration.
In addition, if, overregulating gray-scale value D0 so greater than input gray level value D1, input gray level value D2 becomes greater than input gray level value D2.But,, overregulate gray-scale value D0 so and become less than input gray level value D2 if input gray level value D2 becomes less than input gray level value D1.Difference between input gray level value D2 and the input gray level value D1 is big more, and it is just big more with respect to the variable quantity of input gray level value D2 to overregulate gray-scale value D0.
Therefore, in liquid crystal indicator, improve the delay of image in showing, make that the observability during improving animated image shows becomes possibility by utilizing look-up table to finish to overregulate to drive.
But traditional LCD of showing among Figure 14 has such problem, promptly owing in fact directly be stored in the frame memory 102 from the data of the input 1 of external unit, so requisite be that the memory capacity of frame memory 102 should be quite big.
General introduction of the present invention
In view of the discussion of front, the purpose of this invention is to provide the liquid crystal indicator that is used for finishing the look-up table that overregulates driving that has of the memory capacity that can reduce the frame memory of preparing to be used to postpone to import data.
According to a first aspect of the present invention, a kind of liquid crystal indicator that utilizes the liquid crystal board display image is provided, comprising:
Be used for producing the first form part of the gray scale output data that obtains by the figure place that reduces first gray scale input data;
Be used for producing the frame storage area of second gray scale input data, the described second input gray level data are the display cycle acquisitions that postpone a two field picture by the gray scale output data of in liquid crystal board first form partly being presented;
Be used for producing the second form part of overregulating gray scale output that stores in advance according to the magnitude relationship between first gray scale input data and second gray scale input data; And
Wherein the image in liquid crystal board shows that overregulating gray scale output by use realizes.
In the statement in front, preferred pattern is such, promptly wherein first form part by finishing the figure place that data conversion reduces the gray scale output data, consequently the gray-scale value hour gray scale output data when first gray scale input data is to produce by coarse interval, and produces at relatively short and more tiny interval as long as first gray scale is imported the gray-scale value high-gray level output data of data.
In addition, preferred pattern is such, and promptly wherein first gray scale input data are formed by 8, and the gray scale output data is formed by 5.
In addition, preferred pattern is such, and promptly wherein first gray scale input data are formed by 6, and the gray scale output data is formed by 4.
In addition, preferred pattern is such, and promptly wherein first gray scale input data are formed by 6, and the gray scale output data is formed by 3.
In addition, preferred pattern is such, each red data, green data and the blue data that promptly wherein constitute first gray scale input data are respectively all formed by 8, and each red data and the blue data that constitute the gray scale output data are formed by 5, and the green data that constitutes the gray scale output data is formed by 6.
In addition, preferred pattern is such, actually or promptly wherein second form part according to the gray-scale value of first gray scale input data greater than, equal less than when not finishing the data conversion that reduces figure place as yet corresponding to the gray-scale value of second gray scale input data of first gray scale input data produce by finish data conversion with change corresponding to greater than, be equal to or less than the gray-scale value that the figure place of the gray-scale value of first gray scale input data obtains.
In addition, preferred pattern is such, and promptly wherein liquid crystal board is twisted-nematic (TN) type.
In addition, preferred pattern is such, and promptly wherein liquid crystal board is to switch (IPS) type in the face.
In addition, preferred pattern is such, and promptly wherein the image demonstration is finished in liquid crystal board with a some reversal process.
In addition, preferred pattern is such, and promptly wherein the image demonstration is finished in liquid crystal board with the line reversal process.
In addition, preferred pattern is such, and promptly wherein the image demonstration is finished in liquid crystal board with the frame reversal process.
Adopt above-mentioned configuration, overregulate driving method in order to use, when import data in the frame memory and in frame memory, postpone a frame period and import look-up table subsequently when determining to overregulate gray-scale value by then it being kept at the figure place that reduces the input data at input one side installation data map table, significantly reduce the memory capacity of frame memory, the size of frame memory is reduced to minimum and reduce cost all will become possible.
Brief Description Of Drawings
Above-mentioned purpose, advantage and feature with other of the present invention will become apparent by the description below in conjunction with accompanying drawing, wherein
Fig. 1 is the block scheme of displaying according to the configuration of the liquid crystal indicator of embodiment of the present invention;
Fig. 2 is the chart of an example of the content of the data conversion table that uses in TN (twisted-nematic) the type liquid crystal board that is illustrated in according to embodiment of the present invention;
Fig. 3 is the chart of another example of the content of the data conversion table that uses in the TN type liquid crystal board that is illustrated in according to embodiment of the present invention;
Fig. 4 is the chart of another example of the content of the data conversion table that uses in the TN type liquid crystal board that is illustrated in according to embodiment of the present invention;
Fig. 5 is the chart of example that is illustrated in the content of the data conversion table that uses in IPS according to embodiment of the present invention (switching in the face) the type liquid crystal board;
Fig. 6 is used for explaining the chart that overregulates the operation of driving in the TN type liquid crystal board according to embodiment of the present invention;
Fig. 7 is used for explaining the chart that overregulates the operation of driving in the IPS type liquid crystal board according to embodiment of the present invention;
Fig. 8 is the chart of an example of the content of the look-up table that uses in the TN type liquid crystal board that is illustrated in according to embodiment of the present invention;
Fig. 9 is the chart of another example of the content of the look-up table that uses in the TN type liquid crystal board that is illustrated in according to embodiment of the present invention;
Figure 10 is the chart of another example of the content of the look-up table that uses in the TN type liquid crystal board that is illustrated in according to embodiment of the present invention;
Figure 11 is the chart of example of the content of the look-up table that uses in the IPS type liquid crystal board that is illustrated in according to embodiment of the present invention;
Figure 12 shows the chart be used for confirming according to the example of the moving image of the effect of overregulating driving of embodiment of the present invention;
Figure 13 A and 13B show the chart of example of confirming to overregulate the effect of driving with visual inspection;
Figure 14 is a synoptic diagram of showing the profile instance of finishing traditional liquid crystal indicator that overregulates driving;
Figure 15 is the chart that is used for explaining traditional function of overregulating driving.
Detailed description of the present invention
Utilize each embodiment to describe in further detail with reference to the accompanying drawings and implement best mode of the present invention.
Fig. 1 is the block scheme of displaying according to the configuration of the liquid crystal indicator of embodiment of the present invention.Fig. 2 is the chart of an example of the content of the data conversion table that uses in the TN type liquid crystal board that is illustrated in according to described embodiment.Fig. 3 is the chart of another example of the content of the data conversion table that uses in the TN type liquid crystal board that is illustrated in according to described embodiment.Fig. 4 is the chart of another example of the content of the data conversion table that uses in the TN type liquid crystal board that is illustrated in according to described embodiment.Fig. 5 is the chart of example of the content of the data conversion table that uses in the IPS type liquid crystal board that is illustrated in according to described embodiment.Fig. 6 is used for explaining the chart that overregulates the operation of driving in the TN type liquid crystal board according to described embodiment.Fig. 7 is used for explaining the chart that overregulates the operation of driving in the IPS type liquid crystal board according to described embodiment.Fig. 8 is the chart of an example of the content of the look-up table that uses in the TN type liquid crystal board that is illustrated in according to described embodiment.Fig. 9 is the chart of another example of the content of the look-up table that uses in the TN type liquid crystal board that is illustrated in according to described embodiment.Figure 10 is the chart of another example of the content of the look-up table that uses in the TN type liquid crystal board that is illustrated in according to described embodiment.Figure 11 is the chart of the example of the look-up table that uses in the IPS type liquid crystal board that is illustrated in according to described embodiment.Figure 12 shows the chart be used for confirming according to the example of the moving image of the effect of overregulating driving of described embodiment.Figure 13 A and 13B show the chart of example of confirming to overregulate the effect of driving with visual inspection.
In addition, in the liquid crystal indicator of described embodiment, the same with the situation of conventional example shown in Figure 14, the demonstration of coloured image is to finish same processing for every kind of color and be accomplished by being used to RGB (red, green, blue) data from external unit, but, for the description that provides below is provided, monochromatic situation about showing will only be explained.
As shown in Figure 1, the liquid crystal indicator of described embodiment mainly comprises data conversion table 1, controller 2, frame memory 3, look-up table 4 and LCD5.Wherein LCD5 has the configuration identical with traditional LCD shown in Figure 14 104.The input 1 that data conversion table 1 is changed from the picture signal of external unit reduces to cause its figure place, then the input 1 through conversion is exported as output 1.Controller 2 is fed to look-up table 4 to the output 1 through delay as input 2 output 1 has been delayed a frame period in frame memory 3 after.Frame memory 3 is preserved a frame period to the input data continuously, and then exports it.Look-up table 4 is presented to LCD 5 by the output 2 using from the input 1 of external unit and come the input 2 of self-controller 2 to produce to be used for finishing to overregulate driving and it.
The operation of the liquid crystal indicator of described example is described with reference to Fig. 1 to Figure 13 A and 13B.Data conversion table 1 change conduct converts its figure place to (for example) 5 from (for example) 8 by the data break of the input 1 of the picture signal of forming from the numerical data (gray-scale value) of external unit, and the input through conversion is exported as output 1.Controller 2 is preserved the output more afterwards of a frame period to output 1 input frame memory 3 to it then in frame memory 3, make output 1 postpone a frame period whereby, then it is presented to look-up table 4 as input 2.Because look-up table 4 directly receives input 1 when receiving input 2,, and it is presented to LCD 5 so its produces the outputs 2 that are used for finishing overregulating driving that will be determined by every group of input 1 and input 2.
In LCD 5, with the same in conventional example shown in Figure 14, the scan line drive circuit (not shown) is presented sweep signal to every sweep trace according to the synchrodata of coming self-controller 2; The data line drive circuit (not shown) is presented data-signal to every data line according to the synchrodata of coming self-controller 2, and according to slave controller 2 by exporting the signal that 2 data about gray-scale value of presenting change every column data line, this signal changes the light penetration in each pixel capacitors subsequently, so display image.
In this case, data-switching is to be finished by data conversion table 1 with Fig. 2 or mode shown in Figure 5.Fig. 2 is illustrated in the data-switching under the situation of TN type liquid crystal board.In data conversion table shown in Figure 2, be used to import 5 the gradation data that 18 gradation data is converted into output 1.Here, output 1 data are to set like this, become greatly if the gray-scale value of importing 1 data, is exported the interval of 1 data so near " 0 " (deceive), and along with the gray-scale value of input 1 data became more near 255 (in vain), the interval of exporting 1 data becomes shorter and shorter.
Fig. 3 is illustrated in and is used under the situation of TN type liquid crystal board the gradation data by 6 inputs of forming 1 is converted to content instance by the data conversion table 1 of the gradation data of 4 outputs of forming 1, the same with situation shown in Figure 2, the gray-scale value of the data of input 1 is big more, and the interval between the data of output 1 is just more little.In addition, Fig. 4 is illustrated in and is used under the situation of TN type liquid crystal board the gradation data by 6 inputs of forming 1 is converted to content instance by the data conversion table 1 of the gradation data of 3 outputs of forming 1, and the gray-scale value of importing 1 data is big more, and the interval between the data of output 1 is just more little.
The gradation data that Fig. 5 is illustrated in following 8 input 1 of the situation of IPS (face in switch) type liquid crystal board is converted into the example of gradation data of 5 output 1.The formation of data conversion table 1 is similar to those that show in Fig. 2 to Fig. 4 under the situation of TN type liquid crystal board, still, because the difference aspect the transmitance of liquid crystal board, its content more or less is different from the formation of showing in Fig. 2 to Fig. 4.
In addition, under the situation of IPS type liquid crystal board, the data conversion table 1 of gradation data that is used to the data conversion table 1 or be used to of gradation data that the gradation data of 6 input 1 converts 4 output 1 to is converted to the gradation data of 6 input 13 output 1 can be set up as mentioned above in the same way.
In the gray-scale value of input 1 data a side near 0 (zero), interval between output 1 the data can become big reason and be in the data-switching of using the data conversion table 1 shown in Fig. 2 to 5, the gray-scale value of the data of input 1 overregulate near that side of 0 (zero) gray-scale value always usefulness just to finish the gray-scale value (being the gray-scale value in the present frame) of the input 1 in the frame of that frame front of overregulating driving definite.
Fig. 6 is the chart that is illustrated in the data that are used to overregulate driving under the situation of TN type liquid crystal board.In Fig. 6, the gray-scale value in a frame of finishing that frame front of overregulating driving just, promptly the gray-scale value of the input data in frame memory 3 is as the horizontal ordinate curve plotting, and the gray-scale value in finishing that frame that overregulates driving is as the ordinate curve plotting, and every curve representation is just at the gray-scale value of a frame of that frame back of finishing to overregulate driving.In addition, in Fig. 6, just be called as " initial gray-scale value ", and just be called as " terminal gray-scale value " at the gray-scale value of finishing after overregulating driving at the gray-scale value of finishing before overregulating driving.
As shown in Figure 6, if initial gray-scale value is near 0 (zero) (almost reaching black), for example, in the scope of 0 to 111 gray level, because the inclination of figure is to be level slowly and almost with regard to terminal gray-scale value, so obtain terminal gray-scale value, it is possible then determining to overregulate value.So, in frame memory 3, because the accurate storage of initial gray-scale value is not to be absolutely necessary, when (for example corresponding to unique numerical value of above-mentioned scope, the value " 0 " of output 1 in the form of Fig. 2) when being stored, in fact various operations all are possible, without any problem.
On the other hand, if initial gray-scale value, is accurately stored if not terminal gray-scale value and initial gray-scale value both because the inclination of figure is big near 255 (almost reaching white), it is impossible determining to overregulate gray-scale value.
Fig. 7 is the chart that is illustrated in the data that are used to overregulate driving under the situation of IPS type liquid crystal board.In Fig. 7, be the same all as the indication of the gray-scale value of horizontal ordinate and ordinate trace and figure, and those of the classification that is used for initial gray-scale value and terminal gray-scale value and Fig. 6 are the same with in the TN type liquid crystal board that Fig. 6 showed those.
As shown in Figure 7, situation as TN type liquid crystal board, if initial gray-scale value is near 0 (almost reaching black), for example, gray-scale value is in 0 to 95 scope, because the inclination of figure is to be level slowly and almost with regard to terminal gray-scale value, so iff obtaining terminal gray-scale value, it is possible determining to overregulate gray-scale value so.
On the other hand, if initial gray-scale value, is accurately stored if not terminal gray-scale value and initial gray-scale value both because the inclination of figure is big near 255 (almost reaching white), it is impossible determining to overregulate gray-scale value.
Look-up table 4 utilizes initial gray-scale value and terminal gray-scale value to produce overregulating gray-scale value and it is presented to LCD 5 as output 2.In this case, when the data-switching that reduces figure place still imperfect tense, since the input gray level value be actually initial gray-scale value equal under the state of terminal gray-scale value as in look-up table 4 with the corresponding output gray level value of input gray level value (in some cases, do not have corresponding value) be output, so overregulating driving does not finish, but the gray-scale value that overregulates greater than terminal gray-scale value is the output that is used for less than the initial gray-scale value of input gray level value, and is the output that is used for greater than the initial gray-scale value of input gray level value less than the gray-scale value that overregulates of terminal gray-scale value.
Fig. 8 be illustrated in the look-up table 4 that uses under the situation of TN type liquid crystal board content example and show and the data of the actual measured value of the corresponding output 2 of data of the data of 8 input 1 and 5 s' input 2.
Fig. 9 be illustrated in the look-up table 4 that uses under the situation of TN type liquid crystal board content example and show and the data of the actual measured value of the corresponding output 2 of data of the data of 6 input 1 and 4 s' input 2.
Figure 10 be illustrated in the look-up table 4 that uses under the situation of TN type liquid crystal board content example and show and the data of the actual measured value of the corresponding output 2 of data of the data of 6 input 1 and 3 s' input 2.
Figure 11 be illustrated in the look-up table 4 that uses under the situation of IPS type liquid crystal board content example and show and the data of the actual measured value of the corresponding output 2 of data of the data of 8 input 1 and 5 s' input 2.
In addition, under the situation of IPS type liquid crystal board, as the content of look-up table 4, can use with the data of the actual measured value of the corresponding output 2 of data of the data of 6 input 1 and 4 s' input 2 or with the data of the actual measured value of the corresponding output 2 of data of the data of 6 input 1 and 4 s' input 2.
Figure 12 shows the figure be used for confirming according to the example of the moving image of the effect of overregulating driving of the present invention, and ball of its graphic extension is the image during motion in background in the direction of arrows.
In moving image shown in Figure 12, do not using under the situation of overregulating driving, overregulating in use and drive but do not reduce under the situation of figure place, overregulate in use and drive and the data-switching of 6 input 1 become under 4 the input data conditions when Figure 13 A and 13B are illustrated in the liquid crystal indicator of described embodiment and confirm to overregulate the effect of driving with visual inspection, and overregulating in use and to drive and the data-switching of 6 input 1 become the result who obtains under 3 the input data conditions.In this case, the effect of overregulating driving is to judge according to stay many hangovers or stay less hangover at the rear of moving ball actually; In other words, drive or use under the inadequate situation of overregulating driving not using to overregulate, the image of ball stays many hangovers; Otherwise, overregulate fully under the situation of driving in use, in image, stay less hangover.
The situation that case representation among Figure 13 A is such, wherein ball provides 21 gray levels, background provides 36 gray levels, and change and to occur on the direction that the screen gray scale increases progressively at the rear of ball, in other words, do not using under the situation of overregulating driving, owing to the delay that increases in the rear of ball background gray scale, the phenomenon of image that stays the ball of dark hangover at its rear remarkably is revealed, and picture quality is reduced.On the other hand, overregulate in use and to drive but do not reduce under the situation of figure place, the increase of gray scale is accelerated on the rear direction of ball, so the image of ball stays less hangover, therefore cause maximum error in the gray scale overregulating of 0 (zero) gray level, and therefore make picture quality than higher.In addition, overregulate in use under the situation of driving and minimizing figure place (promptly the figure place of the data of input being reduced to 4 from 6), therefore the maximum error of overregulating gray-scale value is a gray level increasing progressively on the direction, so the image of ball stays less hangover, makes the picture quality can be than higher.Otherwise, the figure place of data is being reduced under 3 the situation from 6, the maximum error of overregulating gray-scale value is 4 gray levels, so overregulate to drive and become undue, though the image of ball does not stay hangover, but the back edge line of ball is revealed in the mode of blast, and picture quality is reduced.
The situation that case representation among Figure 13 B is such, wherein ball provides 39 gray levels, background provides 30 gray levels, and change and to occur on the direction that the screen gray scale successively decreases at the rear of ball, do not using under the situation of overregulating driving, because in the delay that the rear of ball background gray scale is successively decreased and produced, stay the phenomenon that the image of the ball of bright hangover is revealed at its rear and remarkably take place, picture quality is reduced.On the other hand, overregulate in use and to drive but do not reduce under the situation of figure place, successively decrease owing to gray scale takes place, so the image of ball stays less hangover at the rear of ball, and the maximum error of overregulating gray scale is 0 (zero) gray level, therefore makes the picture quality can be than higher.
In addition, overregulate in use under the situation of driving and minimizing figure place (promptly the figure place of the data of input being reduced to 4 from 6), because the maximum error of overregulating gray scale is two gray levels increasing progressively on the direction,, therefore make the picture quality can be than higher so the image of ball stays less hangover.But, the figure place of data to be reduced under 3 the situation from 6, the maximum error of overregulating gray scale is 5 gray levels increasing progressively direction, owing to inadequately overregulate driving, the image of ball stays many hangovers, therefore makes picture quality lower.
As what in Figure 12 and Figure 13 A and 13B, show, when the data of 6 inputs 1 are converted into 3 input data, the error of overregulating gray scale becomes big, therefore the edge of image line is by blast, any effect of perhaps overregulating driving almost never obtained, but,, can obtain almost identical effect with the effect that under the situation that does not reduce figure place, can obtain if the data of 6 input 1 are converted into 4 input data.
Confirm that from the above-mentioned effect of visual inspection that relies on the result of process clearly illustrates that: become 4 input data by data-switching 6 input 1, can obtain almost and the identical image of image that when the input data directly are stored in the frame memory 3, is obtained, therefore the memory capacity of frame memory is significantly reduced.
Therefore, in liquid crystal indicator of the present invention, by data conversion table being installed in input one side and after figure place of its input data of minimizing the input data being kept in the frame memory that makes an input frame period of data delay, the memory capacity of frame memory can be greatly reduced when comparing with the direct storage input data conditions of keeping intact.In other words, when the data of 8 inputs 1 are converted into 5 input data, for example, under the situation of the XGA (graphic array of expansion) that constitutes by 1024 * 786 pixels, if use 8, then need the capacity of 768 kilobyte, still, if use 5, the capacity that then has only 480 kilobyte is essential.In addition, when the data of 6 inputs 1 are converted into 4 input data, under the situation of the XGA that constitutes by 1024 * 786 pixels, if use 6, then the capacity of 576 kilobyte is necessary, still, if use 4, the capacity that then has only 384 kilobyte is essential.In addition, under the situation of VGA (Video Graphics Array, 640 * 480 pixels) and SXGA (graphic array of super expansion, 1280 * 1024 pixels), memory span can be greatly reduced except XGA.
Obviously, the present invention is not limited to above-mentioned embodiment, and can be changed and revise under situation about not departing from the scope of the present invention with spirit.For example, in colour liquid crystal display device, by the input 1 of 8 compositions being finished data-switching about the gradation data that comprises the data that are used for redness (R), green (G) and blue (B), so that be used in the figure places that comprise red and blue two kinds of colors and be 5 and the figure place that is used to have the green of high observability is 6, can produce the gradation data of input 1.In addition, the present invention go for using the reversal of poles method (promptly for every sweep trace, the polarity of signal voltage in the odd number sequence pixel capacitors and the pixel capacitors in the even number sequence between the some reversal process of alternately being reversed; For every sweep trace, the line reversal process that the polarity of signal voltage is alternately reversed; And the every frame counter-rotating of the polarity of signal voltage frame reversal process once) all situations.
Claims (12)
1. liquid crystal indicator with the liquid crystal board display image, comprising:
Be used for producing the first form part of the gray scale output data that obtains by the figure place that reduces first gray scale input data;
Be used for producing the frame memory part of second gray scale input data, described second gray scale input data are to obtain by the display cycle that in described liquid crystal board the described gray scale output data of partly being presented by first form is postponed a two field picture;
Be used for producing the second form part of overregulating gray scale output that stores in advance according to the magnitude relationship between first gray scale input data and second gray scale input data; And
Wherein the image in described liquid crystal board shows by using the described gray scale output realization of overregulating.
2. according to the liquid crystal indicator of claim 1, wherein said first form part is by finishing the figure place that data conversion reduces described gray scale output data, so that when the gray-scale value of described first gray scale input data hour, the variation of the value of the described gray scale output data of the tendency of changes of the value of described gray scale output data when bigger than the gray-scale value of importing data when described first gray scale is little.
3. according to the liquid crystal indicator of claim 2, wherein said first gray scale input data are formed by 8, and described gray scale output data is formed by 5.
4. according to the liquid crystal indicator of claim 2, wherein said first gray scale input data are formed by 6, and the gray scale output data is formed by 4.
5. according to the liquid crystal indicator of claim 2, wherein said first gray scale input data are formed by 6, and described gray scale output data is formed by 3.
6. according to the liquid crystal indicator of claim 2, each red data, green data and the blue data that wherein constitute described first gray scale input data are respectively all formed by 8, and each red data and the blue data that constitute described gray scale output data are formed by 5, and the green data that constitutes described gray scale output data is formed by 6.
7. according to the liquid crystal indicator of claim 1, the wherein said second form part, or actually according to the gray-scale value of described first gray scale input data greater than, equal less than when not finishing the data conversion that reduces figure place as yet, corresponding to the gray-scale value of described second gray scale input data of described first gray scale input data, produce by finish data conversion with conversion with greater than, be equal to or less than the gray-scale value that the corresponding described figure place of gray-scale value of described first gray scale input data obtains.
8. according to the liquid crystal indicator of claim 1, wherein said liquid crystal board is a twisted nematic.
9. according to the liquid crystal indicator of claim 1, wherein said liquid crystal board is a switch type in the face.
10. according to the liquid crystal indicator of claim 1, wherein the demonstration of the image in described liquid crystal board is finished with a some reversal process.
11. according to the liquid crystal indicator of claim 1, wherein the demonstration of the image in described liquid crystal board is finished with the line reversal process.
12. according to the liquid crystal indicator of claim 1, wherein the demonstration of the image in described liquid crystal board is finished with the frame reversal process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002146165A JP2003084736A (en) | 2001-06-25 | 2002-05-21 | Liquid crystal display device |
| JP146165/2002 | 2002-05-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1459774A CN1459774A (en) | 2003-12-03 |
| CN1236415C true CN1236415C (en) | 2006-01-11 |
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| CN 02127658 Expired - Lifetime CN1236415C (en) | 2002-05-21 | 2002-08-06 | Liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100965596B1 (en) * | 2003-12-27 | 2010-06-23 | 엘지디스플레이 주식회사 | Method and apparatus for driving liquid crystal display device |
| CN1318890C (en) * | 2004-06-04 | 2007-05-30 | 友达光电股份有限公司 | Dynamic picture signal grey level treater and treating method for liquid-crystal displaying device |
| JP5077734B2 (en) | 2005-06-30 | 2012-11-21 | Ｎｌｔテクノロジー株式会社 | Liquid crystal display device and driving method thereof |
| CN100353413C (en) * | 2005-09-27 | 2007-12-05 | 友达光电股份有限公司 | Liquid crystal driving system and method |
| CN101727848B (en) * | 2008-10-10 | 2012-02-15 | 华映视讯（吴江）有限公司 | Data alignment device and data alignment method of liquid crystal display |
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