CN101197122A - Multi-frame overdriving circuit and method for LCD and overdriving unit - Google Patents
Multi-frame overdriving circuit and method for LCD and overdriving unit Download PDFInfo
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Abstract
The invention discloses a multiple frame overdriving circuit of liquid crystal displayer, which comprises a counting unit and a multiple frame overdriving unit. The counting unit counts the periodic number m of pixel data corresponding to pixel maintaining in the first gray-scale value, wherein m is positive integer. When the pixel data corresponding to pixel is in a first frame period, the multiple frame overdriving unit respectively outputs y multiple frame overdriving pixel data corresponding to pixel within y continuous frame periods starting from the first frame period after the first gray-scale value is converted into a second gray-scale value. y multiple frame overdriving pixel data are relevant with the first gray-scale value, the second gray-scale value and frame period m, wherein y is a positive integer. The invention further discloses the multiple frame overdriving method and the overdriving unit of liquid crystal displayer.
Description
Technical field
The present invention relates to a kind of multiplex frame overdrive circuit and method and over-drive unit of LCD, and relate in particular to a kind of multiplex frame overdrive circuit and the method and over-drive unit that can reduce the LCD of dynamic smear.
Background technology
The reaction time of liquid crystal molecule is relevant with the cross-pressure at liquid crystal molecule two ends, so in order to make the reaction velocity of liquid crystal molecule promote, the technology that must adopt overdrive (overdriving) is to improve the reaction velocity of liquid crystal molecule.Face the increasing liquid crystal panel of size now, the reaction time that the technology that more adopts two frames (2frame) to overdrive is improved whole liquid crystal molecule is to do compensation to corresponding image frame.
Fig. 1 is the synoptic diagram of traditional double frame overdrive circuit.Two frame overdrive circuits 100 comprise working storage 110, first over-drive unit 120 and second over-drive unit 130.Working storage 110 receives and stores the pairing pixel data of a pixel.When the pairing pixel data of this pixel changed the second GTG value that corresponded to for first frame period into by the first GTG value, first over-drive unit 120 was exported the first overdrive pixel data OD1 according to the first GTG value and the second GTG value in first frame period.Second over-drive unit 130 is according to the first GTG value and the second GTG value, in exporting the second overdrive pixel data OD2 adjacent to second frame period in first frame period.Yet, when the pairing pixel data of pixel changes higher GTG value into by lower GTG value, because the velocity of rotation of liquid crystal molecule is slower when lower GTG value, therefore on image frame, can produces dynamic smear (motion blur), thereby reduce the quality of image frame.If the technology that adopts the traditional double frame to overdrive then only can compensate the image in two frame periods at most.
Under human eye visible fixed translational speed, the short dynamic image of image width can cause short dynamic smear on image frame, and the long dynamic image of image width can cause long dynamic smear on image frame.Please refer to Fig. 2 A, it is the synoptic diagram of the dynamic smear of traditional image frame.Among Fig. 2 A, dynamic image A, the B of different pieces of information width and C (point-like block) cause dynamic smear A ', B ' and the C ' of different length respectively.For instance, dynamically smear A ', B ' and C ' have kept three, four and five frame periods respectively.When the time that dynamic smear A ', B ' and C ' keep surpasses two frame periods, the technology that the traditional double frame is overdrived can't be done complete compensation, cause the penetrance curve of liquid crystal molecule to produce recessed situation suddenly in the 3rd frame period, shown in Fig. 2 B, wherein, solid line---expression is overdrived pixel voltage to the curve of time, and dotted line-----expression penetrance is to the curve of time, thus, will make the quality of image frame to promote.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of multiplex frame overdrive circuit and method and over-drive unit of LCD, use the internal memory of less capacity, in corresponding continuous a plurality of frame periods, do compensation, to reduce the dynamic smear on the image frame.
For achieving the above object, the present invention proposes a kind of multiplex frame overdrive circuit of LCD, and it comprises counting unit and multiplex frame over-drive unit.The pairing pixel data of counting unit counting pixel is maintained at the frame period of the first GTG value and counts m, and m is a positive integer.When the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, the multiplex frame over-drive unit is in being in initial continuous y frame period with first frame period, and output corresponds to y multiplex frame overdrive pixel data of pixel respectively.Y multiplex frame overdrive pixel data is relevant to the first GTG value, the second GTG value and frame period and counts m, and y is a positive integer.
For achieving the above object, the present invention proposes a kind of multiplex frame over-driving method of LCD, comprises, at first, counting pixel pairing pixel data is maintained at the frame period of the first GTG value and counts m, and m is a positive integer.Afterwards, when the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, in being in initial continuous y frame period with first frame period, output corresponds to y multiplex frame overdrive pixel data of pixel respectively, y multiplex frame overdrive pixel data is relevant to the first GTG value, the second GTG value and frame period and counts m, and y is a positive integer.
For achieving the above object, the present invention also proposes a kind of over-drive unit of LCD, and it comprises two frame overdrive circuits and multiplex frame overdrive circuit.When the pairing pixel data of pixel changes the second GTG value that corresponded to for first frame period into by the first GTG value, two frame overdrive circuits are exported first overdrive pixel data and second overdrive pixel data respectively in first frame period and the second adjacent frame period.First overdrive pixel data and the second overdrive pixel data homogeneous phase are about the first GTG value and the second GTG value.The pairing pixel data of multiplex frame overdrive circuit counting pixel is maintained at the frame period of the first GTG value and counts m, and in order to work as the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, in being in initial continuous y frame period with the 3rd frame period, output corresponds to y multiplex frame overdrive pixel data of pixel respectively.Y multiplex frame overdrive pixel data is relevant to the first GTG value, the second GTG value and frame period and counts m, and m is a positive integer, and y is a positive integer.The 3rd frame period is adjacent to second frame period.
And for achieving the above object, the present invention also proposes a kind of over-drive unit of LCD, comprises single frames overdrive circuit and multiplex frame overdrive circuit.When the pairing pixel data of pixel changes the one second GTG value that corresponded to for first frame period into by the first GTG value, the single frames overdrive circuit is exported first overdrive pixel data in first frame period, and first overdrive pixel data is relevant to the first GTG value and the second GTG value.The pairing pixel data of multiplex frame overdrive circuit counting pixel is maintained at the frame period of the first GTG value and counts m, and in order to work as the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, in being in initial continuous y frame period with second frame period, output corresponds to y multiplex frame overdrive pixel data of pixel respectively, y multiplex frame overdrive pixel data is relevant to the first GTG value, the second GTG value and frame period and counts m, m is a positive integer, and y is a positive integer.Second frame period is adjacent to first frame period.
The multiplex frame overdrive circuit of the disclosed LCD of the present invention and method and over-drive unit, utilize the multiplex frame overdrive circuit, the action that in corresponding continuous a plurality of frame periods, repeatedly compensates respectively, make that the penetrance curve of liquid crystal molecule is comparatively mild, do not have suddenly recessed situation and produce, reduce the dynamic smear on the image frame.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 illustrates the synoptic diagram of traditional double frame overdrive circuit;
Fig. 2 A illustrates the synoptic diagram of the dynamic smear of traditional image frame;
Fig. 2 B illustrates pixel voltage and the penetrance curve map to the time of overdriving of traditional liquid crystal molecule;
Fig. 3 is the calcspar of multiplex frame overdrive circuit first embodiment of LCD of the present invention;
Fig. 4 illustrates pixel voltage and the penetrance curve map to the time of overdriving according to the liquid crystal molecule of first embodiment of the invention;
Fig. 5 is the process flow diagram of the multiplex frame over-driving method of LCD of the present invention;
Fig. 6 is the calcspar of over-drive unit second embodiment of LCD of the present invention;
Fig. 7 is the calcspar of over-drive unit the 3rd embodiment of LCD of the present invention.
Wherein, Reference numeral:
100,610: two frame overdrive circuits 110: working storage
120,614: the first over-drive unit 130,616: the second over-drive unit
300,620,720: multiplex frame overdrive circuit 310,622,722: counting unit
320,624,724: counting working storage unit 330,626,726: multiplex frame is overdrived
350,612,712: frame working storage 600,700: over-drive unit
628,728: GTG judging unit 710: the single frames overdrive circuit
714: over-drive unit
Embodiment
The present invention is relevant for a kind of multiplex frame overdrive circuit and method and over-drive unit of LCD, utilize the multiplex frame overdrive circuit, use the internal memory of less capacity, in corresponding continuous a plurality of frame periods, to compensate action, to reduce the dynamic smear on the image frame.
First embodiment
Fig. 3 is the calcspar of multiplex frame overdrive circuit first embodiment of LCD of the present invention.Multiplex frame overdrive circuit 300 comprises counting unit 310, counting working storage 320 and multiplex frame over-drive unit 330.Counting unit 310 is in order to count the frame number m that the pairing pixel data of single pixel maintains the first GTG value, and m is a positive integer.This frame number m system corresponds to the time span that the pairing pixel data of single pixel maintains the first GTG value.That is to say, when the pixel data of this single pixel in a continuous m frame, all show the first GTG value, counting unit 310 will calculate the number m of frame.330 of multiplex frame over-drive unit are in order to work as the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, in being in initial continuous y frame period with first frame period, output corresponds to y multiplex frame overdrive pixel data of pixel respectively.Y multiplex frame overdrive pixel data counted m corresponding to the first GTG value, the second GTG value and frame period, and wherein y is a positive integer.
As shown in Figure 2, if the dynamic image C of Fig. 2 is the rectangle pattern of single GTG value GR, and the words that dynamic image C advances along direction D, then as the leading edge FE in-position of dynamic image C c " after; pixel P just begins to show the brightness that corresponds to GTG value GR, and keeps brightness therewith and leave position c up to edge RE after the dynamic image C " till.Hence one can see that, because dynamic image can move on picture, so the image width of dynamic image and translational speed can determine pixel P to show the frame number of single GTG value GR in fact.If the width of the image width of dynamic image is long more, the dynamic image that moves can make pixel P show that the frame number of single GTG value GR is many more.And if the speed of dynamic image is slow more, the dynamic image that moves can make pixel P show that the frame number of single GTG value GR is also many more.Therefore, the image width of dynamic image and translational speed will have influence on the pixel data of certain pixel on the liquid crystal panel, maintain the time span of same GTG value, and the pixel data that also promptly has influence on certain pixel maintains the frame number of same GTG value.Because dynamically the image length (or smear is kept the time span of demonstration) of smear is relevant with the image width and the translational speed of dynamic image again on the image frame, can know by inference thus, the frame number that is maintained at same GTG value when the pixel data of certain pixel is many more, and then the length of the dynamic smear that is produced on image frame is long more.So, present embodiment is by usage count unit 310, the pixel data of counting each pixel is maintained at the frame period of same gray level value and counts m, m is a positive integer, and produce the overdrive pixel data in a plurality of frame periods according to this, so that image to display is next carried out the compensation in a plurality of frame periods, can eliminate dynamic smear effectively.
The figure place that counting working storage 320 is counted the buffer unit that corresponds to a pixel of m in order to the storage frame period is the n position, and n is a positive integer, and 2
nBe less than or equal to m.For instance, when n equaled 4, counting unit 310 can count up to the frame period several 16 at most.
The above-mentioned second GTG value is in fact corresponding to the data of a current image frame shown in first frame period.The pixel data of supposing certain pixel all is maintained at the first GTG value in preceding m the frame period in first frame period.After the pairing pixel data of this pixel changes the second GTG value in first frame period, multiplex frame over-drive unit 330 is according to the multiplex frame look-up table (look-up table) of overdriving, in being in initial continuous y frame period with first frame period, output corresponds to y multiplex frame overdrive pixel data OD1～ODy of pixel respectively.Wherein, this y multiplex frame overdrive pixel data OD1～ODy is relevant to the first GTG value, the second GTG value and frame period and counts m, and y is a positive integer.That is to say that the m value is different, then overdriving the y value of the correspondence chosen in the look-up table by multiplex frame also can be different, and the GTG value of the selected overdrive pixel data OD1 that arrives～ODy also can difference.In addition, when the y value more than or equal to 3 the time, compared to traditional two frame overdrive circuits, the disclosed multiplex frame overdrive circuit 300 of present embodiment has preferable compensation effect for corresponding image frame.
In addition, the characteristic of different liquid crystal molecules also has the time that different smears continues.Therefore, the multiplex frame look-up table of overdriving preferably also can design according to the characteristic of liquid crystal molecule, so that the GTG value of y value and overdrive pixel data OD1～ODy also adjusts with reference to the characteristic of liquid crystal molecule.
For instance, all be maintained at 20 when 3 frame periods of pixel data before first frame period, then this moment, the m value was 3 as can be known.After pixel data changes GTG value 25 in first frame period into by GTG value 20, multiplex frame over-drive unit 330 is according to the multiplex frame look-up table of overdriving, find GTG value 20 (initial GTG value) and GTG value 25 (termination GTG value), and the m value y value that equals at 3 o'clock, for example be 4.And find the value of multiplex frame overdrive pixel data OD1～OD4.Then, multiplex frame over-drive unit 330 in after continuous four frame periods of first frame period to the export multiplex frame overdrive pixel data OD1～OD4 respectively, the GTG value of multiplex frame overdrive pixel data OD1～OD4 for example is 32,29,27 and 26 in regular turn.Thus, can in after first to fourth frame period in image to display is compensated, to eliminate dynamic smear effectively.
In addition, in the above-mentioned disclosed multiplex frame overdrive circuit 300, with single pixel is that a unit of display is that example is done explanation, right single pixel comprises in fact respectively in order to show three sub-pixels of redness (r), green (g) and blue (b), so it is among the embodiment of a unit of display that multiplex frame overdrive circuit 300 also can be applicable to single sub-pixel, also be, multiplex frame overdrive circuit 300 also can be in order to handle the pairing sub-pixel data of sub-pixel, and its principle of operation is same as above-mentioned, so no longer repeat in this.
Please refer to Fig. 4, it illustrates is pixel voltage and the penetrance curve map to the time of overdriving according to the liquid crystal molecule of first embodiment of the invention, wherein, solid line---expression is overdrived pixel voltage to the curve of time, and dotted line-----expression penetrance is to the curve of time.Can observe by Fig. 4 and to learn, y multiplex frame overdrive pixel data OD1～ODy is respectively at first frame period being the result who in initial continuous y frame period image frame is done compensation, the penetrance curve that can make liquid crystal molecule is a flat curve, and can as conventional practice, not have suddenly recessed situation to produce, so can eliminate dynamic smear effectively.
In addition, if the pairing pixel data of pixel is after z the frame period after being transformed into the second GTG value, z is that positive integer and z are less than y, pixel data changes the 3rd GTG value into again by the second GTG value again, and then multiplex frame over-drive unit 330 can be given up as yet output (y-z) individual multiplex frame overdrive pixel data and carry out the multiplex frame in another stage and overdrive.
During the multiplex frame in this another stage is overdrived, multiplex frame over-drive unit 330 is in when being transformed into the 3rd GTG value being initial continuous y ' in the individual frame period pairing (z+1) frame period, and output corresponds to the individual multiplex frame overdrive pixel data of y ' of pixel respectively.Wherein, the individual multiplex frame overdrive pixel data of this y ' is relevant to the frame period that the second GTG value, the 3rd GTG value and pixel data be maintained at the second GTG value and counts m ', and m ' and y ' are positive integer.In this, the frame period counts m ' and is equal to z in fact.
For instance, after pixel data changes GTG value 25 in first frame period into by GTG value 20, multiplex frame over-drive unit 330 should be exported multiplex frame overdrive pixel data OD1～OD4 respectively in continuous four frame periods of first frame period to the, the GTG value of multiplex frame overdrive pixel data OD1～OD4 for example is 32 in regular turn, 29,27 and 26, but if pixel data Data is changed into the words of GTG value 40 again by GTG value 25 in the 3rd frame period, after then multiplex frame over-drive unit 330 is exported GTG value 32 and 29 respectively in first frame period in frame period to the second, can give up pairing GTG value 27 of the 3rd and the 4th frame period and 26, overdrive and carry out the multiplex frame in another stage.For example, because in first frame period in frame period to the second, pixel data is GTG value 25, so learn that the m value after the renewal is 2.Multiplex frame over-drive unit 330 according to the m value (equaling 2) that is maintained at after GTG value 25, GTG value 40 and the renewal, produces new multiplex frame overdrive pixel data again, comprises the image in a plurality of frame periods afterwards in the 3rd frame period with demonstration.
In addition, multiplex frame overdrive circuit 300 also comprises frame working storage 350, frame working storage 350 is coupled to GTG and judges 340, and in order to receive and to store the pairing pixel data of pixel, for example is the data in previous frame period that correspond to first frame period of present picture.Also promptly, frame working storage 350 stores the GTG value that corresponds to a previous image frame, for example is the above-mentioned first GTG value.
The present invention discloses a kind of multiplex frame over-driving method of LCD in addition.Fig. 5 is the process flow diagram of the multiplex frame over-driving method of LCD of the present invention.At first, in step 500, counting pixel pairing pixel data is maintained at the frame period of the first GTG value and counts m, and m is a positive integer.Then, in step 510, the storage frame period is counted m.
In the step 520, when the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, according to the multiplex frame look-up table of overdriving, in being in initial continuous y frame period with first frame period, output corresponds to y multiplex frame overdrive pixel data of pixel respectively.Wherein, this y multiplex frame overdrive pixel data is relevant to the first GTG value, the second GTG value and frame period and counts m, and y is a positive integer.
In the step 530, if the pairing pixel data of pixel is after z the frame period after being transformed into the second GTG value, pixel data changes the 3rd GTG value into again by the second GTG value again, then in when being transformed into the 3rd GTG value being initial continuous y ' in the individual frame period pairing second frame period, output corresponds to the individual multiplex frame overdrive pixel data of y ' of pixel respectively.Wherein, the individual multiplex frame overdrive pixel data of this y ' system is relevant to the frame period that the second GTG value, the 3rd GTG value and pixel data be maintained at the second GTG value and counts m ', and wherein m ', y ' and z are positive integer, and z is less than y.In this, the frame period counts m ' and is equal to z in fact.
The principle of operation of the multiplex frame over-driving method of LCD has been specified in the related description of multiplex frame overdrive circuit 300, so in no longer repeating.
Second embodiment
Fig. 6 is the calcspar of over-drive unit second embodiment of LCD of the present invention.Over-drive unit 600 comprises two frame overdrive circuits 610 and multiplex frame overdrive circuit 620.Two frame overdrive circuits 610 comprise frame working storage 612, first over-drive unit 614 and second over-drive unit 616.Frame working storage 612 receives and stores the pairing pixel data Data of a pixel.
When the pairing pixel data Data of this pixel changes the second GTG value that corresponded to for first frame period into by the first GTG value, first over-drive unit 614 is exported the first overdrive pixel data OD1 according to the first GTG value and the second GTG value in first frame period.Second over-drive unit 616 is according to the first GTG value and the second GTG value, in exporting the second overdrive pixel data OD2 adjacent to second frame period in first frame period.Wherein, the first GTG value is in fact corresponding to previous image frame, and the second GTG value is in fact corresponding to current image frame.Frame working storage 612 corresponding to the GTG value of previous image frame, for example is the first GTG value in fact.
Multiplex frame overdrive circuit 620 comprises counting unit 622, counting working storage 624 and multiplex frame over-drive unit 626.Counting unit 622 is counted m in order to the frame period that the pairing pixel data of counting pixel is maintained at the first GTG value, and wherein m is a positive integer.Counting working storage 624 is counted m in order to store the frame period.
When the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, multiplex frame over-drive unit 626 is according to the multiplex frame look-up table of overdriving, in being in initial continuous y frame period with the 3rd frame period, output corresponds to y the multiplex frame overdrive pixel data OD3～OD (2+y) of pixel respectively.Aforementioned y multiplex frame overdrive pixel data OD3～OD (2+y) counts m corresponding to the first GTG value, the second GTG value and frame period, and y is a positive integer.The 3rd frame period is adjacent to second frame period.
In addition, if the pairing pixel data of pixel is after z the frame period after being transformed into the second GTG value, z is that positive integer and z are less than y, pixel data changes the 3rd GTG value into again by the second GTG value again, then multiplex frame over-drive unit 626 is in when being transformed into the 3rd GTG value being initial continuous y ' in the individual frame period pairing (z+1) frame period, and output corresponds to the individual multiplex frame overdrive pixel data of y ' of pixel respectively.The individual multiplex frame overdrive pixel data of aforementioned y ' is counted m ' corresponding to the frame period that the second GTG value, the 3rd GTG value and pixel data are maintained at the second GTG value, and wherein m ' and y ' are positive integer.In this, the frame period counts m ' and is equal to z in fact.
In addition because the dynamic smear on the image frame is when more often coming across the pairing pixel data of pixel for low GTG value, so when LCD be the technology that just adopts multiplex frame to overdrive when hanging down the GTG value in pixel data, then can save power consumption.Therefore, preferably multiplex frame overdrive circuit 620 also comprises GTG judging unit 628, whether is lower than a default GTG value in order to the GTG value of judging pixel data.When the GTG value of pixel data is higher than default GTG value, the then action do not counted of counting unit 622, and multiplex frame overdrive circuit 620 is not exported the multiplex frame overdrive pixel data.
In addition, be that the unit of display is that example is done explanation with single pixel in the over-drive unit 600, yet single pixel comprises in fact respectively in order to show three sub-pixels of redness (r), green (g) and blue (b), so it is among the embodiment of the unit of display that over-drive unit 600 also can be applicable to single sub-pixel, also be that GTG judging unit 628 can judge whether the GTG value of sub-pixel data is lower than a default GTG value; If the GTG value of sub-pixel data is lower than default GTG value, then multiplex frame overdrive circuit 620 is handled sub-pixel data again, and its principle of operation is same as above-mentioned, so no longer repeat in this.
The principle of operation of the multiplex frame overdrive circuit 620 of LCD has been specified in the related description of multiplex frame overdrive circuit 300, so in no longer repeating.
The 3rd embodiment
Fig. 7 is the calcspar of over-drive unit the 3rd embodiment of LCD of the present invention.Over-drive unit 700 comprises single frames overdrive circuit 710 and multiplex frame overdrive circuit 620.Single frames overdrive circuit 710 comprises frame working storage 712 and over-drive unit 714.Frame working storage 712 receives and stores the pairing pixel data of a pixel.
When the pairing pixel data of this pixel changed the second GTG value that corresponded to for first frame period into by the first GTG value, over-drive unit 714 was exported the first overdrive pixel data OD1 according to the first GTG value and the second GTG value in first frame period.The first GTG value is in fact corresponding to previous image frame, and the second GTG value is in fact corresponding to current image frame.Frame working storage 712 corresponding to the GTG value of previous image frame, for example is the first GTG value in fact.
Multiplex frame overdrive circuit 720 comprises counting unit 722, counting working storage 724 and multiplex frame over-drive unit 726.Counting unit 722 is counted m in order to the frame period that the pairing pixel data of counting pixel is maintained at the first GTG value, and m is a positive integer.Counting working storage 724 is counted m in order to store the frame period.
When the pairing pixel data of pixel in first frame period, after changing the second GTG value into by the first GTG value, multiplex frame over-drive unit 726 is according to the multiplex frame look-up table of overdriving, in being in initial continuous y frame period with second frame period, output corresponds to y the multiplex frame overdrive pixel data OD2～OD (1+y) of pixel respectively.Aforementioned y multiplex frame overdrive pixel data OD2～OD (1+y) counts m corresponding to the first GTG value, the second GTG value and frame period, and y is a positive integer.Second frame period is adjacent to first frame period.
In addition, if the pairing pixel data of pixel is after z the frame period after being transformed into the second GTG value, z is that positive integer and z are less than y, pixel data changes the 3rd GTG value into again by the second GTG value again, then multiplex frame over-drive unit 726 is in when being transformed into the 3rd GTG value being initial continuous y ' in the individual frame period pairing (z+1) frame period, and output corresponds to the individual multiplex frame overdrive pixel data of y ' of pixel respectively.The individual multiplex frame overdrive pixel data of aforementioned y ' is counted m ' corresponding to the frame period that the second GTG value, the 3rd GTG value and pixel data are maintained at the second GTG value, and wherein m ' and y ' are positive integer.In this, the frame period counts m ' and is equal to z in fact.
In addition, because it is when hanging down the GTG value that the dynamic smear on the image frame more often comes across the pairing pixel data of pixel, so multiplex frame overdrive circuit 720 also comprises GTG judging unit 728, whether be lower than a default GTG value in order to the GTG value of judging pixel data.When the GTG value of pixel data was higher than default GTG value, multiplex frame overdrive circuit 720 was not exported the multiplex frame overdrive pixel data.
The principle of operation of the multiplex frame overdrive circuit 720 of LCD has been specified in the related description of multiplex frame overdrive circuit 620, so in no longer repeating.
The multiplex frame overdrive circuit of the disclosed LCD of the above embodiment of the present invention and method and over-drive unit, utilize the multiplex frame overdrive circuit, the action that in corresponding continuous a plurality of frame periods, repeatedly compensates respectively, make that the penetrance curve of liquid crystal molecule is comparatively mild, do not have suddenly recessed situation and produce, reduce the dynamic smear on the image frame.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (22)
1. the multiplex frame overdrive circuit of a LCD is characterized in that, comprising:
One counting unit is counted m in order to count the frame period that the pairing pixel data of a pixel is maintained at one first GTG value, and m is a positive integer; And
One multiplex frame over-drive unit, in order to work as pairing this pixel data of this pixel in one first frame period, after changing one second GTG value into by this first GTG value, in being in initial continuous y frame period with this first frame period, output corresponds to y multiplex frame overdrive pixel data of this pixel respectively, this y multiplex frame overdrive pixel data is relevant to this first GTG value, this second GTG value and should the frame period counts m, and y is a positive integer.
2. the multiplex frame overdrive circuit of LCD according to claim 1 is characterized in that other comprises: a counting working storage, count m in order to store this frame period.
3. the multiplex frame overdrive circuit of LCD according to claim 1, it is characterized in that, this multiplex frame over-drive unit is according to multiplex frame look-up table of overdriving, and in being in initial continuous y frame period with this first frame period, exports this y multiplex frame overdrive pixel data respectively.
4. the multiplex frame overdrive circuit of LCD according to claim 1 is characterized in that other comprises: a frame working storage, and in order to receive and to store pairing this pixel data of this pixel.
5. the multiplex frame overdrive circuit of LCD according to claim 1, it is characterized in that, if pairing this pixel data of this pixel is after z the frame period after being transformed into this second GTG value, this pixel data changes one the 3rd GTG value into again by this second GTG value again, then this multiplex frame over-drive unit is in when being transformed into the 3rd GTG value being that initial continuous y ' is in the individual frame period in pairing one second frame period, output corresponds to the individual multiplex frame overdrive pixel data of y ' of this pixel respectively, the individual multiplex frame overdrive pixel data of this y ' is relevant to this second GTG value, the 3rd GTG value and this pixel data are maintained at a frame period of this second GTG value and count m ', m ', y ' and z are positive integer, and z is less than y.
6. the multiplex frame over-driving method of a LCD is characterized in that, comprising:
(a) counting one pixel pairing pixel data frame period of being maintained at one first GTG value is counted m, and m is a positive integer; And
(b) when pairing this pixel data of this pixel in one first frame period, after changing one second GTG value into by this first GTG value, in being in initial continuous y frame period with this first frame period, output corresponds to y multiplex frame overdrive pixel data of this pixel respectively, this y multiplex frame overdrive pixel data is relevant to this first GTG value, this second GTG value and should the frame period counts m, and y is a positive integer.
7. the multiplex frame over-driving method of LCD according to claim 6 is characterized in that, step (a) comprises in addition:
(a1) storing this frame period counts m.
8. the multiplex frame over-driving method of LCD according to claim 6, it is characterized in that, step (b) in being continuous y the initial frame period with this first frame period, is exported this y multiplex frame overdrive pixel data according to the multiplex frame look-up table of overdriving respectively.
9. the multiplex frame over-driving method of LCD according to claim 6 is characterized in that, also comprises:
(a2) receive and store pairing this pixel data of this pixel.
10. the multiplex frame over-driving method of LCD according to claim 6 is characterized in that other comprises:
(c) if pairing this pixel data of this pixel after z the frame period after being transformed into this second GTG value, this pixel data changes one the 3rd GTG value into again by this second GTG value again, then in when being transformed into the 3rd GTG value being that initial continuous y ' is in the individual frame period in pairing one second frame period, output corresponds to the individual multiplex frame overdrive pixel data of y ' of this pixel respectively, the individual multiplex frame overdrive pixel data of this y ' is relevant to this second GTG value, the 3rd GTG value and this pixel data are maintained at a frame period of this second GTG value and count m ', m ', y ' and z are positive integer, and z is less than y.
11. the over-drive unit of a LCD is characterized in that, comprising:
A pair of frame overdrive circuit, in order to when the pairing pixel data of a pixel changes the one second GTG value that corresponded to for one first frame period into by one first GTG value, in this first frame period and one second adjacent frame period, export one first overdrive pixel data and one second overdrive pixel data respectively, this first overdrive pixel data and this second overdrive pixel data homogeneous phase are about this first GTG value and this second GTG value; And
One multiplex frame overdrive circuit, count m in order to count the frame period that pairing this pixel data of this pixel is maintained at this first GTG value, and in order to work as pairing this pixel data of this pixel in this first frame period, after changing one second GTG value into by this first GTG value, in being in initial continuous y frame period with one the 3rd frame period, output corresponds to y multiplex frame overdrive pixel data of this pixel respectively, this y multiplex frame overdrive pixel data is relevant to this first GTG value, this second GTG value and should the frame period count m, m is a positive integer, y is a positive integer, and the 3rd frame period is adjacent to this second frame period.
12. the over-drive unit of LCD according to claim 11 is characterized in that, this pair frame overdrive circuit comprises:
One frame working storage receives and stores pairing this pixel data of this pixel;
One first over-drive unit is coupled to this frame working storage, in order to according to this first GTG value and this second GTG value, exports this first overdrive pixel data in this first frame period; And
One second over-drive unit is coupled to this frame working storage, in order to according to this first GTG value and this second GTG value, exports this second overdrive pixel data in this second frame period.
13. the over-drive unit of LCD according to claim 12 is characterized in that, this multiplex frame overdrive circuit comprises:
One counting unit is counted m in order to count the frame period that pairing this pixel data of this pixel is maintained at this first GTG value; And
One multiplex frame over-drive unit, in order to when pairing this pixel data of this pixel in this first frame period, change this second GTG value into by this first GTG value after, in the frame period, export this y multiplex frame overdrive pixel data in this continuous y respectively.
14. the over-drive unit of LCD according to claim 13 is characterized in that, this multiplex frame overdrive circuit also comprises:
One counting working storage is counted m in order to store this frame period.
15. the over-drive unit of LCD according to claim 13 is characterized in that, this multiplex frame overdrive circuit comprises in addition:
One GTG judging unit, whether be lower than a default GTG value in order to the GTG value of judging this pixel data, when the GTG value of this pixel data was higher than this default GTG value, this counting unit was not counted action, and this multiplex frame over-drive unit is not exported this y multiplex frame overdrive pixel data.
16. the over-drive unit of LCD according to claim 11, it is characterized in that, if pairing this pixel data of this pixel is after z the frame period after being transformed into this second GTG value, this pixel data changes one the 3rd GTG value into again by this second GTG value again, then this multiplex frame over-drive unit is in when being transformed into the 3rd GTG value being that initial continuous y ' is in the individual frame period in pairing one the 4th frame period, output corresponds to the individual multiplex frame overdrive pixel data of y ' of this pixel respectively, the individual multiplex frame overdrive pixel data of this y ' is relevant to this second GTG value, the 3rd GTG value and this pixel data are maintained at a frame period of this second GTG value and count m ', m ', y ' and z are positive integer, and z is less than y.
17. the over-drive unit of a LCD is characterized in that, comprising:
One single frames overdrive circuit, in order to when the pairing pixel data of a pixel changes the one second GTG value that corresponded to for one first frame period into by one first GTG value, export one first overdrive pixel data in this first frame period, this first overdrive pixel data is relevant to this first GTG value and this second GTG value; And
One multiplex frame overdrive circuit, count m in order to count the frame period that pairing this pixel data of this pixel is maintained at this first GTG value, and in order to work as pairing this pixel data of this pixel in this first frame period, after changing one second GTG value into by this first GTG value, in being in initial continuous y frame period with one second frame period, output corresponds to y multiplex frame overdrive pixel data of this pixel respectively, this y multiplex frame overdrive pixel data is relevant to this first GTG value, this second GTG value and should the frame period count m, m is a positive integer, y is a positive integer, and this second frame period is adjacent to this first frame period.
18. the over-drive unit of LCD according to claim 17 is characterized in that, this single frames overdrive circuit comprises:
One frame working storage receives and stores pairing this pixel data of this pixel; And
One over-drive unit is coupled to this frame working storage, in order to according to this first GTG value and this second GTG value, exports this first overdrive pixel data in this first frame period.
19. the over-drive unit of LCD according to claim 18 is characterized in that, this multiplex frame overdrive circuit comprises:
One counting unit is counted m in order to count the frame period that pairing this pixel data of this pixel is maintained at this first GTG value; And
One multiplex frame over-drive unit, in order to when pairing this pixel data of this pixel in this first frame period, change this second GTG value into by this first GTG value after, in the frame period, export this y multiplex frame overdrive pixel data in this continuous y respectively.
20. the over-drive unit of LCD according to claim 19 is characterized in that, this multiplex frame overdrive circuit also comprises:
One counting working storage is counted m in order to store this frame period.
21. the over-drive unit of LCD according to claim 19 is characterized in that, this multiplex frame overdrive circuit also comprises:
One GTG judging unit, whether be lower than a default GTG value in order to the GTG value of judging this pixel data, when the GTG value of this pixel data was higher than this default GTG value, this counting unit was not counted action, and this multiplex frame over-drive unit is not exported this y multiplex frame overdrive pixel data.
22. the over-drive unit of LCD according to claim 17, it is characterized in that, if pairing this pixel data of this pixel is after z the frame period after being transformed into this second GTG value, this pixel data changes one the 3rd GTG value into again by this second GTG value again, then this multiplex frame over-drive unit is in when being transformed into the 3rd GTG value being that initial continuous y ' is in the individual frame period in pairing one the 3rd frame period, output corresponds to the individual multiplex frame overdrive pixel data of y ' of this pixel respectively, the individual multiplex frame overdrive pixel data of this y ' is relevant to this second GTG value, the 3rd GTG value and this pixel data are maintained at a frame period of this second GTG value and count m ', m ', y ' and z are positive integer, and z is less than y.
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| CN2007103056329A CN101197122B (en) | 2007-12-26 | 2007-12-26 | Multi-frame overdriving circuit and method for LCD and overdriving unit |
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| CN2007103056329A CN101197122B (en) | 2007-12-26 | 2007-12-26 | Multi-frame overdriving circuit and method for LCD and overdriving unit |
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| CN101877210B (en) * | 2009-04-30 | 2012-05-30 | 华映视讯（吴江）有限公司 | Driving device and driving method of LCD |
| CN102024403B (en) * | 2009-09-16 | 2013-01-16 | 群康科技(深圳)有限公司 | Method for relieving image smearing and image track phenomena and related displayer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101877210B (en) * | 2009-04-30 | 2012-05-30 | 华映视讯（吴江）有限公司 | Driving device and driving method of LCD |
| CN102024403B (en) * | 2009-09-16 | 2013-01-16 | 群康科技(深圳)有限公司 | Method for relieving image smearing and image track phenomena and related displayer |
| WO2017201811A1 (en) * | 2016-05-27 | 2017-11-30 | 深圳市华星光电技术有限公司 | Method and device for driving liquid crystal display |
| CN108806623A (en) * | 2018-04-25 | 2018-11-13 | 南京中电熊猫平板显示科技有限公司 | Over-pressed compensation device and method and overvoltage compensation display device and method |
| CN109671412A (en) * | 2019-02-18 | 2019-04-23 | 京东方科技集团股份有限公司 | Over-driving method, device, the controller of liquid crystal display panel and display equipment |
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| CN110379391A (en) * | 2019-07-02 | 2019-10-25 | 南京中电熊猫液晶显示科技有限公司 | A kind of liquid crystal display panel and the method for improving the hangover of liquid crystal display panel dynamic menu |
| WO2022047930A1 (en) * | 2020-09-03 | 2022-03-10 | Tcl华星光电技术有限公司 | Method for controlling display panel, display panel, and display device |
| US11600239B2 (en) | 2020-09-03 | 2023-03-07 | Tcl China Star Optoelectronics Technology Co., Ltd. | Method of controlling display panel, display panel, and display device |
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