CN101140749A - Pixel drive method - Google Patents
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Abstract
本发明公开了一种像素的驱动方法，包括下列步骤：首先，依据像素的目标灰阶，而决定与所述目标灰阶相对应的第一预定灰阶与第二预定灰阶，其中所述第一预定灰阶与所述第二预定灰阶加总的等效灰阶与所述目标灰阶相同。接着，依据所述第一预定灰阶与所述第二预定灰阶，而产生第一驱动电压与第二驱动电压，借以于一个画面期间各别驱动所述像素内的两个子像素。其中，当所述等效灰阶小于第一设定灰阶时，致使所述第一驱动电压大于所述第二驱动电压；而当所述等效灰阶大于等于所述第一设定灰阶时，致使所述第一驱动电压小于所述第二驱动电压。
The invention discloses a pixel driving method, which includes the following steps: firstly, according to the target gray scale of the pixel, a first predetermined gray scale and a second predetermined gray scale corresponding to the target gray scale are determined, wherein the The equivalent gray scale of the sum of the first predetermined gray scale and the second predetermined gray scale is the same as the target gray scale. Next, a first driving voltage and a second driving voltage are generated according to the first predetermined gray scale and the second predetermined gray scale, so as to respectively drive two sub-pixels in the pixel during one frame period. Wherein, when the equivalent gray scale is smaller than the first set gray scale, the first driving voltage is greater than the second driving voltage; and when the equivalent gray scale is greater than or equal to the first set gray scale In step, the first driving voltage is made smaller than the second driving voltage.
Description
Technical field
The present invention relates to a kind of flat display driving method, relate in particular to a kind of image element driving method that can allow LCD have low colour cast characteristic.
Background technology
LCD (Liquid Crystal Display, LCD) because have that high image quality, space utilization efficient are good, low consumpting power, advantageous characteristic such as radiationless, thereby become the main flow in market gradually.At present, market is towards characteristics such as height contrast (contrast ratio), rapid reaction and wide viewing angles for the performance requirement of LCD, and the technology that can reach the wide viewing angle requirement at present for example has multi-zone vertical alignment nematic (Multi-domain Vertically Alignment, MVA), multiple domain horizontal direction matching (Multi-domainHorizontal Alignment, MHA), twisted nematic adds visual angle expansion film (Twisted Nematic pluswide viewing film, TN+film) and the transverse electric field form (In-Plane Switching, IPS).
Fig. 1 is for from LCD gamma curve (the gamma curve that measures of institute's actual amount with great visual angle; Be designated hereinafter simply as side-looking angle gamma curve) synoptic diagram of A and gamma curve (the being designated hereinafter simply as positive visual angle gamma curve) B that measures from the positive visual angle of LCD institute actual amount, wherein the pixel resolution of LCD is 8 (also promptly 0～255 GTG), and horizontal, the longitudinal axis distinctly is expressed as GTG and penetrance.Please refer to Fig. 1, though LCD can reach the purpose of wide viewing angle by above-mentioned multinomial technology, but under realistic situation, because gamma curve A can be different with positive visual angle gamma curve B with great visual angle, therefore, when the user stands in the angle of deflection comparatively (for example 60 degree) and watches the shown image frame of LCD, the color of the image frame that it is seen can't be identical with the color of watching the shown same image picture of LCD from the front, and the just so-called colour cast of this kind phenomenon.
In order to solve LCD colour cast problem with great visual angle, present someone proposes to solve the method for colour cast, but it mainly is the sub-pixel that each pixel in the display panels is divided into two drive, and the penetrance of one of them sub-pixel can permanent be higher than the penetrance of another sub-pixel, also promptly has permanent bright in the brightness that has than the sub-pixel of low penetration rate than the brightness meeting of the sub-pixel of high penetration.Therefore, utilize the color of higher gray scale and the color of low GTG to be mixed into the mode of the color of GTG in the middle of, not only can ease up so that LCD colour cast problem with great visual angle transfers to, and when the user when facing or watch the shown image frame of LCD with the angle that tilts, then can see the image frame of close color.
Yet, because bright person's perseverance is bright in above-mentioned two sub-pixels, and dark person is permanent dark, so follow under the condition of this type of solution, it is relatively good that the colour cast of low GTG and color of higher gray scale can be enhanced, but the amplitude that the colour cast of the color of middle high gray is then improved is quite limited.Therefore, when the composition of the shown image frame of LCD occupied the color of most middle high grays, LCD this moment colour cast problem with great visual angle still can be quite serious.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of image element driving method, when it sets GTG in order to the equivalent GTG that is obtained more than or equal to one after at least two independent sub pixels distinctly are driven in the pixel, cause in described two sub-pixels the non-perseverance of bright person bright, and the dark non-perseverance of person is dark, improves the colour cast of the color of all GTGs whereby.
Another object of the present invention just provides a kind of image element driving method, when its equivalent GTG that is obtained after being driven in order to timesharing in a pixel is during a picture is set GTG more than or equal to one, the on-fixed time section of the brightness that causes described pixel in during described picture is permanent bright or permanent dark, improves the colour cast of the color of all GTGs whereby.
For achieving the above object, the present invention proposes a kind of driving method of pixel, wherein said pixel comprises at least the first sub-pixel and second sub-pixel, and described driving method comprises the following steps: at first, target gray scale according to described pixel, and decision and the described target gray scale corresponding first predetermined GTG and the second predetermined GTG, the wherein said first predetermined GTG is identical with described target gray scale with the equivalent GTG that the described second predetermined GTG adds up.
Then, according to the described first predetermined GTG and the described second predetermined GTG, and produce first driving voltage and second driving voltage, so as to described first sub-pixel and described second sub-pixel of driving out of the ordinary during a picture.Wherein, when described equivalent GTG is set GTG less than first, cause described first driving voltage greater than described second driving voltage; And when described equivalent GTG is set GTG more than or equal to described first, cause described first driving voltage less than described second driving voltage.
And, for achieving the above object, the present invention proposes a kind of driving method of pixel in addition, it comprises the following steps: at first, target gray scale according to described pixel, and decision and the described target gray scale corresponding first predetermined GTG and the second predetermined GTG, the wherein said first predetermined GTG is identical with described target gray scale with the equivalent GTG that the described second predetermined GTG adds up.Then, first sub picture period during a picture according to the described first predetermined GTG, and produces first driving voltage to drive described pixel.
At last, second sub picture period during described picture according to the described second predetermined GTG, and produces second driving voltage to drive described pixel.Wherein, when described equivalent GTG is set GTG less than first, cause described first driving voltage greater than described second driving voltage, and when described equivalent GTG is set GTG more than or equal to described first, cause described first driving voltage less than described second driving voltage.
In one embodiment of the invention, the described first predetermined GTG and the described second predetermined GTG determine by the mode of tabling look-up.
In one embodiment of the invention, when described equivalent GTG is set GTG more than or equal to second, cause described first driving voltage greater than described second driving voltage, wherein said second sets GTG sets GTG greater than described first.
In one embodiment of the invention, when described equivalent GTG is set GTG more than or equal to the 3rd, cause described first driving voltage less than described second driving voltage, the wherein said the 3rd sets GTG sets GTG greater than described second.
In one embodiment of the invention, described first set GTG, described second set GTG and the described the 3rd set GTG by face gamma curve that described pixel institute actual amount measures and the measurement of the described pixel reality of stravismus to gamma curve determined.
In one embodiment of the invention, the area ratio between described first sub-pixel and described second sub-pixel drops between 3: 7 to 3.5: 6.5.
In one embodiment of the invention, between the described first phase and the time ratio between the described second phase drop between 3: 7 to 3.5: 6.5.
For the colour cast problem of the color that will improve all GTGs, the present invention proposes the driving method of two types pixel.Wherein a kind of driving method of pixel is that the notion with the space is a starting point.The driving method of this type mainly is when at least two independent sub pixels in the pixel distinctly are driven equivalent GTG that the back obtained and set GTG more than or equal to one, cause in described two sub-pixels the non-perseverance of bright person bright, and the dark non-perseverance of person is dark.
The driving method of another kind of pixel is that the notion with the time is a starting point.The driving method of this type mainly is when timesharing is driven the equivalent GTG that obtained of back and sets GTG more than or equal to one in a pixel is during a picture, the on-fixed time section of the brightness that causes described pixel in during described picture permanent bright or permanent secretly.Yet, no matter adopt the driving method of any pixel, all can improve the colour cast of the color of all GTGs, so LCD colour cast problem with great visual angle can be solved effectively.
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 is for from the LCD synoptic diagram of the gamma curve A that measures of institute's actual amount and the gamma curve B that measures from the positive visual angle of LCD institute actual amount with great visual angle;
Fig. 2 makees normalized synoptic diagram for the A of gamma curve with great visual angle with Fig. 1 aligns visual angle gamma curve B respectively with positive visual angle gamma curve B;
Fig. 3 be type one with the M sub-pixel of type two and S sub-pixel for required corresponding GTG gamma curve MG out of the ordinary of a target gray scale and the synoptic diagram of SG;
Fig. 4 A illustrates to the M sub-pixel of the ultimate limit state of type one and is the D ' of gamma curve with great visual angle after the C ' of gamma curve with great visual angle and S sub-pixel after the normalization done normalization;
Fig. 4 B illustrates to the M sub-pixel of the ultimate limit state of type two and is the D ' of gamma curve with great visual angle after the C ' of gamma curve with great visual angle and S sub-pixel after the normalization done normalization;
The equivalence that Fig. 5 illustrates C ' of gamma curve with great visual angle after the normalization of the A ' of gamma curve with great visual angle, the positive visual angle gamma curve B ' after the normalization after the normalization, type one and D ' is gamma curve T1 ' with great visual angle, and type two normalization after C ' of gamma curve with great visual angle and the equivalence of D ' the comparison synoptic diagram of gamma curve T2 ' with great visual angle;
Fig. 6 A is the equivalence adjustable range synoptic diagram of gamma curve T1 ' with great visual angle of type one;
Fig. 6 B is the equivalence adjustable range synoptic diagram of gamma curve T2 ' with great visual angle of type two;
Fig. 6 C be type one equivalence with great visual angle gamma curve T1 ' but adjustment region and the equivalence of type two with great visual angle gamma curve T2 ' but the synoptic diagram that overlaps of adjustment region;
Fig. 7 is that M sub-pixel and the S sub-pixel of type three is for required corresponding GTG gamma curve MG ' out of the ordinary of a target gray scale and the synoptic diagram of SG ';
Fig. 8 illustrates the equivalence of the positive visual angle gamma curve B ' after the A ' of gamma curve with great visual angle after the normalization among Fig. 6 C, the normalization, type one gamma curve T1 ' with great visual angle, and the mixed type after the normalization gamma curve Tmix ' is counter with great visual angle makees normalized synoptic diagram;
Fig. 9 is the driving method process flow diagram of the pixel of the embodiment of the invention;
Figure 10 is the driving method process flow diagram of the pixel of another embodiment of the present invention.
Wherein, Reference numeral:
A: gamma curve with great visual angle
B: positive visual angle gamma curve
A ', C ', D ': the gamma curve with great visual angle after the normalization
B ': the positive visual angle gamma curve after the normalization
MG, SG, MG ', SG ': GTG gamma curve
T1 ': C ' of gamma curve with great visual angle after the normalization of type one and the equivalence of D ' be gamma curve with great visual angle
T2 ': C ' of gamma curve with great visual angle after the normalization of type two and the equivalence of D ' be gamma curve with great visual angle
Tmix ': the mixed type after the normalization is gamma curve with great visual angle
N1～N4: node
T1: the counter equivalence of doing normalized type one is gamma curve with great visual angle
Tmix: the anti-normalized mixed type gamma curve with great visual angle of doing
S901, S903: each step of driving method process flow diagram of the pixel of one embodiment of the invention
S1001～S1005: each step of driving method process flow diagram of the pixel of another embodiment of the present invention
Embodiment
The technology effect that the present invention desired to reach is to improve the colour cast of the color of all GTGs, and then solves LCD colour cast problem with great visual angle effectively.And following content will be done one at the technical characterictic of this case and the technology effect desiring to reach and encyclopaedize, and consider and examine so as to offering those skilled in the relevant art of the present invention.
As shown in Figure 1, because gamma curve A is different with positive visual angle gamma curve B with great visual angle, so LCD just can produce colour cast problem with great visual angle.As shown in Figure 2, do normalized words, then can distinctly obtain the positive visual angle gamma curve B ' after the A ' of gamma curve with great visual angle and the normalization after the normalization if the A of gamma curve with great visual angle of Fig. 1 is aligned visual angle gamma curve B respectively with positive visual angle gamma curve B.
In theory, when the slope of the A ' of gamma curve with great visual angle after the normalization during more near the slope (also promptly equaling 1) of the positive visual angle gamma curve B ' after the normalization, the problem of colour cast with great visual angle of LCD just can be improved effectively.Therefore, the driving method of two types pixel proposed by the invention mainly is under the constant condition of the positive visual angle gamma curve B ' after keeping normalization, adjust the A ' of gamma curve with great visual angle after the normalization, so that it presses close to the positive visual angle gamma curve B ' after the normalization.
So, be the driving method that starting point is explained pixel proposed by the invention with the notion in space earlier in this according to above-mentioned idea.The driving method of this type be framework in each pixel of display panels, have two or more can drive and area than the type of sub-pixel inequality.At the beginning, the present invention set earlier have in each pixel of display panels two can drive sub-pixel, and the area ratio between these two sub-pixels is 1: 2.
In addition, bright sub-pixel is called the M sub-pixel earlier in these two sub-pixels, and the bright sub-pixel in back is called the S sub-pixel in these two sub-pixels.Moreover when the area of M sub-pixel and S sub-pixel is 1: 2, and the penetrance perseverance of M sub-pixel is when being higher than the penetrance of S sub-pixel, in this earlier this situation of definition be type one; And when the area of M sub-pixel and S sub-pixel be 2: 1, and the penetrance perseverance of M sub-pixel is when being higher than the penetrance of S sub-pixel, defining this situation earlier in this is type two.In type one and type two, the M sub-pixel can be out of the ordinary according to the GTG gamma curve MG and the SG that are illustrated among Fig. 3 for the required corresponding GTG out of the ordinary of a target gray scale with the S sub-pixel.
So according to above-mentioned definition, Fig. 4 A illustrates to the M sub-pixel of the ultimate limit state of type one and is the D ' of gamma curve with great visual angle after the C ' of gamma curve with great visual angle and S sub-pixel after the normalization done normalization.In addition, Fig. 4 B illustrates to the M sub-pixel of the ultimate limit state of type two and is the D ' of gamma curve with great visual angle after the C ' of gamma curve with great visual angle and S sub-pixel after the normalization done normalization.
In view of the above, the spirit in order to want to explain more clearly that institute of the present invention desire is set forth.In this, with the equivalence of C ' of gamma curve with great visual angle after the normalization among Fig. 4 A and D ' with great visual angle gamma curve T1 ' be illustrated among Fig. 5 so that with normalization after the A ' of gamma curve with great visual angle and normalization after positive visual angle gamma curve B ' compare.In addition, with the equivalence of C ' of gamma curve with great visual angle after the normalization among Fig. 4 B and D ' with great visual angle gamma curve T2 ' be illustrated among Fig. 5 so that with normalization after the A ' of gamma curve with great visual angle and normalization after positive visual angle gamma curve B ' compare.
Be not difficult from Fig. 5 to find that the equivalence of type one gamma curve T1 ' with great visual angle is preferable for the color bias improvement amplitude of the color of low GTG, and the equivalence of type two gamma curve T2 ' is preferable for the color bias improvement amplitude of the color of high gray with great visual angle.In addition, the equivalence of type one with great visual angle between the A ' of gamma curve with great visual angle after gamma curve T1 ' and the normalization formed Dark grey zone be type one equivalence with great visual angle gamma curve T1 ' but adjustment region, it illustrates as shown in Figure 6A; And the equivalence of type two with great visual angle between the A ' of gamma curve with great visual angle after gamma curve T2 ' and the normalization formed light gray zone be type two equivalence with great visual angle gamma curve T2 ' but adjustment region, it illustrates shown in Fig. 6 B.
Therefore, if with the equivalence of type one with great visual angle gamma curve T1 ' but adjustment region and type two equivalence with great visual angle gamma curve T2 ' but adjustment region merging sight words, it can be roughly be divided into three zones as what Fig. 6 C illustrated, its Oxford gray zone only be type one equivalence with great visual angle gamma curve T1 ' but adjustment region, light gray areas only be type two equivalence with great visual angle gamma curve T2 ' but adjustment region, and white portion be type one equivalence with great visual angle gamma curve T1 ' and type two equivalence with great visual angle gamma curve T2 ' but adjustment region.
From Fig. 6 C, should be not difficult to find out, if will three region descriptions in Fig. 6 C go out one with normalization after the close gamma curve with great visual angle of the slope of positive visual angle gamma curve B ' time, the gamma curve Tmix ' with great visual angle of the mixed type after the normalization that is illustrated among Fig. 6 C for example, at first can along the equivalence of type one with great visual angle the minimum gray scale of gamma curve T1 ' (also being GTG 0) begin to go to node N1.Then, keeping slope is to go to node N2 under 1 the state.Afterwards, keep slope again is to go to node N4 under 1 the state as far as possible.Then, go to node N5 gently by what just make behind the node N4.At last, again along the equivalence of type two with great visual angle gamma curve T2 ' go to high gray (also being GTG 255).
So according to the mixed type after the normalization that is illustrated among Fig. 6 C with great visual angle gamma curve Tmix ' as can be known, by the behavior that can generation area behind the node N2 replaces, also promptly by Dark grey regional strike light gray areas.In addition, by the behavior that also can generation area behind the node N3 replaces, also promptly move towards the Dark grey zone by light gray areas.In addition, by the behavior that also can generation area behind the node N4 replaces, also promptly by Dark grey regional strike light gray areas.,, be type three also in this elder generation's this situation of definition so the penetrance of M sub-pixel just can permanent not be higher than the penetrance of S sub-pixel because there is such behavior to take place.In type three, the M sub-pixel can be out of the ordinary according to the GTG gamma curve MG ' and the SG ' that are illustrated among Fig. 7 for the required corresponding GTG out of the ordinary of a target gray scale with the S sub-pixel.
In view of the above, the spirit in order to want to explain more clearly that institute of the present invention desire is set forth.In this, with the equivalence of type one among Fig. 6 C A ' of gamma curve with great visual angle after gamma curve Tmix ', the normalization with great visual angle of the mixed type after gamma curve T1 ', the normalization with great visual angle, and the positive visual angle gamma curve B ' after the normalization is distinctly counter does normalization, and its result illustrates as shown in Figure 8.From Fig. 8, be not difficult to find out, counter do normalized mixed type with great visual angle gamma curve Tmix considerably press close to positive visual angle gamma curve B, so the colour cast of the color of all GTGs (also i.e. 0～255 GTG) will be improved significantly.
Yet foregoing is to be the explanation of doing at 1: 2 with the area ratio between M sub-pixel and S sub-pixel.Yet the present invention can drop between 3: 7 to 3.5: 6.5 to verify out the area ratio between M sub-pixel and S sub-pixel by experiment repeatedly.
So according to above-mentioned disclosed content, will converge below that to put in order out the present invention be the driving method of the pixel that starting point was proposed with the notion in space.Fig. 9 is the driving method process flow diagram of the pixel of the embodiment of the invention.Please refer to Fig. 9, the driving method of the pixel of present embodiment comprises the following steps: at first, as described in step S901, target gray scale according to a pixel, and decision and the described target gray scale corresponding first predetermined GTG and the second predetermined GTG, the wherein said first predetermined GTG is identical with described target gray scale with the equivalent GTG that the described second predetermined GTG adds up.
In this step S901, the described first predetermined GTG and the described second predetermined GTG determine by the mode of tabling look-up, and the foundation of tabling look-up is GTG gamma curve MG ' and the SG ' of Fig. 7.Clearer, when the target gray scale of pixel be 50 GTGs (also be Fig. 7 transverse axis institute mark 50) time, the GTG (also being the x and 0 of the longitudinal axis institute mark of Fig. 7) that corresponds to GTG gamma curve MG ' and SG ' this moment is the described first predetermined GTG and described second and is scheduled to GTG.
Then, as described in step S903, according to the described first predetermined GTG and the described second predetermined GTG, and produce first driving voltage and second driving voltage, so as to described first sub-pixel (also being the M sub-pixel) and described second sub-pixel (also being the S sub-pixel) of driving out of the ordinary during a picture.Wherein, when described equivalent GTG is set GTG less than first, cause described first driving voltage greater than described second driving voltage (also promptly causing the penetrance of M sub-pixel to be higher than the S sub-pixel); And when described equivalent GTG is set GTG more than or equal to described first, cause described first driving voltage less than described second driving voltage (also promptly causing the penetrance of M sub-pixel to be lower than the S sub-pixel).
In present embodiment, when described equivalent GTG is set GTG more than or equal to second, cause described first driving voltage to set GTG and set GTG greater than described first greater than described second driving voltage (also promptly causing the penetrance of M sub-pixel to be higher than the S sub-pixel) wherein said second.In addition, when described equivalent GTG is set GTG more than or equal to the 3rd, cause described first driving voltage less than described second driving voltage (also promptly causing the penetrance of M sub-pixel to be lower than the S sub-pixel), the wherein said the 3rd sets GTG sets GTG greater than described second.
What deserves to be mentioned is at this, described first set GTG, described second set GTG and the described the 3rd set GTG by face gamma curve (also being the positive visual angle gamma curve B ' after the normalization among Fig. 6 C) that described pixel institute actual amount measures and the measurement of the described pixel reality of stravismus to gamma curve (also be the equivalence equivalence gamma curve T2 ' with great visual angle of gamma curve T1 ', type two with great visual angle of type one among Fig. 6 C, and the A ' of gamma curve with great visual angle after the normalization) determined.
In simple terms, described first set GTG, described second and set GTG and the described the 3rd and set GTG and be respectively among Fig. 6 C the distinctly GTG of corresponding penetrance representative of node N2, N3 and N4.Saying that more clearly the pairing penetrance of node N2 is approximately 0.32 among Fig. 6 C, then is GTG more than 150 so the GTG of its representative corresponds to Fig. 1.The pairing penetrance of node N3 is approximately 0.58 among Fig. 6 C, then is about 200 GTGs so the GTG of its representative corresponds to Fig. 1.The pairing penetrance of node N4 is approximately 0.68 among Fig. 6 C, so the GTG of its representative corresponds to the then about GTG more than 220 of Fig. 1.
According to as can be known above-mentioned, the driving method of the pixel of utilization present embodiment is done when driving pixel, and at least two independent sub pixels (yet being M sub-pixel and S sub-pixel) are not bright as bright person's perseverance as the prior art in the pixel, and dark person is secretly permanent.Though, when the equivalent GTG that is obtained after at least two independent sub pixels distinctly are driven in the pixel is set GTG (also being that the described first setting GTG, described second is set GTG and described the 3rd setting GTG) more than or equal to one, cause in described two sub-pixels the non-perseverance of bright person bright, and the dark non-perseverance of person is dark.
Therefore, via the LCD that driving method drove of the pixel of present embodiment from its with great visual angle the gamma curve (also being the anti-normalized mixed type gamma curve Tmix with great visual angle that is Fig. 8) that measures of institute's actual amount can quite press close to the gamma curve (also being the positive visual angle gamma curve B Fig. 1) that measures from its positive visual angle institute actual amount, so the driving method of the pixel of present embodiment can improve the colour cast of the color of all GTGs (also being 0～255 GTG), and then solves LCD colour cast problem with great visual angle effectively.
Yet according to the spirit that institute of the present invention desire is set forth, above-mentioned notion with the space is that to be converged the notion that the image element driving method putting in order out can be converted into the time be starting point to starting point.So according to above-mentioned disclosed content, will converge below that to put in order out the present invention be the driving method of the pixel that starting point was proposed with the notion of time.The driving method of this type is that framework is to be unlocked by the single scanning line in each pixel of display panels, and is driven by single data line.
Figure 10 is the driving method process flow diagram of the pixel of another embodiment of the present invention.Please refer to Figure 10, the driving method of the pixel of present embodiment comprises the following steps: at first, as described in step S1001, target gray scale according to a pixel, and decision and the described target gray scale corresponding first predetermined GTG and the second predetermined GTG, the wherein said first predetermined GTG is identical with described target gray scale with the equivalent GTG that the described second predetermined GTG adds up.In this step S1001, the described first predetermined GTG and the described second predetermined GTG are to determine by the mode of tabling look-up, and the foundation of tabling look-up is similarly GTG gamma curve MG ' and the SG ' of Fig. 7.
Then, as described in step S1003, first sub picture period during a picture according to the described first predetermined GTG, and produces first driving voltage to drive described pixel.At last, as described in step S1005, second sub picture period during described picture according to the described second predetermined GTG, and produces second driving voltage to drive described pixel.Wherein, when described equivalent GTG is set GTG less than first, cause described first driving voltage greater than described second driving voltage (also promptly causing pixel to be higher than the penetrance of second sub picture period in the penetrance of first sub picture period); And when described equivalent GTG is set GTG more than or equal to described first, cause described first driving voltage less than described second driving voltage (also promptly causing pixel to be lower than the penetrance of second sub picture period in the penetrance of first sub picture period).
In present embodiment, when described equivalent GTG is set GTG more than or equal to second, cause described first driving voltage greater than described second driving voltage (also promptly causing pixel to be higher than the penetrance of second sub picture period in the penetrance of first sub picture period), wherein said second sets GTG sets GTG greater than described first.In addition, when described equivalent GTG is set GTG more than or equal to the 3rd, cause described first driving voltage less than described second driving voltage (also promptly causing pixel to be lower than the penetrance of second sub picture period in the penetrance of first sub picture period), the wherein said the 3rd sets GTG sets GTG greater than described second.
Similarly, described first set GTG, described second set GTG and the described the 3rd set GTG equally by face gamma curve (also being the positive visual angle gamma curve B ' after the normalization among Fig. 6 C) that described pixel institute actual amount measures and the measurement of the described pixel reality of stravismus to gamma curve (also be the equivalence equivalence gamma curve T2 ' with great visual angle of gamma curve T1 ', type two with great visual angle of type one among Fig. 6 C, and the A ' of gamma curve with great visual angle after the normalization) determined.In simple terms, described first set GTG, described second and set GTG and the described the 3rd and set GTG and be respectively among Fig. 6 C the distinctly GTG of corresponding penetrance representative of node N2, N3 and N4.
According to as can be known above-mentioned, the driving method of pixel of utilization present embodiment goes to carry out pixel is done when driving, and the brightness of pixel is not as one of them is permanent bright or permanent secretly in another in two sub picture period as the prior art.Though, when timesharing is driven the equivalent GTG that obtained of back and sets GTG (also be described first set GTG, described second set GTG and set GTG with the described the 3rd) more than or equal to one in pixel is during a picture, the on-fixed time section of the brightness that causes described pixel in during described picture (also i.e. first sub picture period and second sub picture period) perseverance bright or permanent secretly.
Therefore, via the LCD that driving method drove of the pixel of present embodiment from its with great visual angle the gamma curve (also being the anti-normalized mixed type gamma curve Tmix with great visual angle that is Fig. 8) that measures of institute's actual amount still can quite press close to the gamma curve (also being the positive visual angle gamma curve B Fig. 1) that measures from its positive visual angle institute actual amount, so the driving method of the pixel of present embodiment can improve the colour cast of the color of all GTGs (also being 0～255 GTG) equally, and then solves LCD colour cast problem with great visual angle effectively.
In view of the above, what deserves to be mentioned is that the driving method of two kinds of pixels proposed by the invention is applicable to and drives any positive visual angle gamma curve and the different LCD of side-looking angle gamma curve.For instance, multi-zone vertical alignment nematic (Multi-domain Vertically Alignment, MVA) type LCD, multiple domain horizontal direction matching (Multi-domain Horizontal Alignment, MHA) type LCD, twisted nematic add visual angle expansion film (Twisted Nematic plus wide viewing film, TN+film) type LCD, and transverse electric field form (In-Plane Switching, IPS) type LCD.
In sum, the invention provides the driving method of two kinds of pixels, wherein a kind of driving method of pixel is that the notion with the space is a starting point, the driving method of this type mainly is when at least two independent sub pixels distinctly are driven the back equivalent GTG that is obtained more than or equal to a setting GTG in the pixel, cause in described two sub-pixels the non-perseverance of bright person bright, and the dark non-perseverance of person is dark.
The driving method of another kind of pixel is that the notion with the time is a starting point, the driving method of this type mainly is when timesharing is driven the equivalent GTG that obtained of back and sets GTG more than or equal to one in a pixel is during a picture, the on-fixed time section of the brightness that causes described pixel in during described picture permanent bright or permanent secretly.But, no matter adopt the driving method of any pixel, all can improve the colour cast of the color of all GTGs, so LCD colour cast problem with great visual angle can be solved effectively.
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 (12)
1. the driving method of a pixel, this pixel comprises at least one first sub-pixel and one second sub-pixel, it is characterized in that this driving method comprises the following steps:
According to a target gray scale of this pixel, and decision and this target gray scale corresponding one first predetermined GTG and one second predetermined GTG, wherein this first predetermined GTG is identical with this target gray scale with the equivalent GTG that this second predetermined GTG adds up; And
According to this first predetermined GTG and this second predetermined GTG, and produce one first driving voltage and one second driving voltage, so as to this first sub-pixel and this second sub-pixel of driving out of the ordinary during a picture,
Wherein, when this equivalence GTG is set GTG less than one first, cause this first driving voltage, and, cause this first driving voltage less than this second driving voltage when this equivalence GTG during more than or equal to this first setting GTG greater than this second driving voltage.
2. the driving method of pixel according to claim 1 is characterized in that, this first predetermined GTG and this second predetermined GTG determine by the mode of tabling look-up.
3. the driving method of pixel according to claim 1 is characterized in that, when this equivalence GTG is set GTG more than or equal to one second, causes this first driving voltage greater than this second driving voltage, and this second setting GTG is greater than this first setting GTG.
4. the driving method of pixel according to claim 3 is characterized in that, when this equivalence GTG is set GTG more than or equal to one the 3rd, causes this first driving voltage less than this second driving voltage, and the 3rd sets GTG greater than this second setting GTG.
5. the driving method of pixel according to claim 4, it is characterized in that, this first set GTG, this second set GTG and the 3rd set GTG by face this pixel reality measurement of gamma curve and stravismus that this pixel institute actual amount measures to gamma curve determined.
6. the driving method of pixel according to claim 1 is characterized in that, the area ratio between this first sub-pixel and this second sub-pixel drops between 3: 7 to 3.5: 6.5.
7. the driving method of a pixel is characterized in that, comprises the following steps:
According to a target gray scale of this pixel, and decision and this target gray scale corresponding one first predetermined GTG and one second predetermined GTG, this first predetermined GTG is identical with this target gray scale with the equivalent GTG that this second predetermined GTG adds up; And
One first sub picture period during a picture according to this first predetermined GTG, and produces one first driving voltage to drive this pixel; And
One second sub picture period during this picture according to this second predetermined GTG, and produces one second driving voltage driving this pixel,
When this equivalence GTG is set GTG less than one first, cause this first driving voltage greater than this second driving voltage, and, cause this first driving voltage less than this second driving voltage when this equivalence GTG during more than or equal to this first setting GTG.
8. the driving method of pixel according to claim 7 is characterized in that, this first predetermined GTG and this second predetermined GTG determine by the mode of tabling look-up.
9. the driving method of pixel according to claim 7 is characterized in that, when this equivalence GTG is set GTG more than or equal to one second, causes this first driving voltage greater than this second driving voltage, and this second setting GTG is greater than this first setting GTG.
10. the driving method of pixel according to claim 9 is characterized in that, when this equivalence GTG is set GTG more than or equal to one the 3rd, causes this first driving voltage less than this second driving voltage, and the 3rd sets GTG greater than this second setting GTG.
11. the driving method of pixel according to claim 10, it is characterized in that, this first set GTG, this second set GTG and the 3rd set GTG by face this pixel reality measurement of gamma curve and stravismus that this pixel institute actual amount measures to gamma curve determined.
12. the driving method of pixel according to claim 7 is characterized in that, between this first phase and the time ratio of this second phase drop between 3: 7 to 3.5: 6.5.
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