CN103000149A - Frame rate conversion (FRC) driving method - Google Patents
Frame rate conversion (FRC) driving method Download PDFInfo
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- CN103000149A CN103000149A CN2012104655569A CN201210465556A CN103000149A CN 103000149 A CN103000149 A CN 103000149A CN 2012104655569 A CN2012104655569 A CN 2012104655569A CN 201210465556 A CN201210465556 A CN 201210465556A CN 103000149 A CN103000149 A CN 103000149A
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Abstract
An embodiment of the invention discloses an FRC driving method, belongs to the display technical field, and solves the technical problem of poor display such as residual images due to unipolarity charge accumulation on a polyimide (PI) layer caused by the existing FRC driving method. The FRC driving method is used for processing pixel units driven by grayscales added in the FRC through a point turnover driving mode and includes exerting voltage on a first group of sub pixels in the pixel units in the first frame; exerting the voltage on the first group of sub pixels in the pixel units in the second frame, wherein the first group of sub pixels comprises at least four sub pixels at the same position and with opposite polarity between two frames; exerting the voltage on a second group of sub pixels in the pixel units in the third frame; and exerting the voltage on the second group of sub pixels in the pixel units in the fourth frame, wherein the second group of sub pixels comprises at least four sub pixels at the same position and with opposite polarity between two frames. The method is applicable to liquid crystal displays in the advanced super dimension switch (ADS) mode.
Description
Technical field
The invention belongs to the display technique field, be specifically related to a kind of frame rate conversion driving method.
Background technology
Along with the development of display technique, Thin Film Transistor-LCD (Thin Film Transistor Liquid Crystal Display is called for short TFT-LCD) has occupied leading position in the flat pannel display field.
Existing liquid crystal display adopts the driving circuit of 6bit input and output more, and the GTG of actual displayed is 2
6Individual, i.e. 64 GTGs.The liquid crystal display of 6bit input and output can be passed through frame rate conversion (Frame Rate Conversion, be called for short FRC) driving method, each sub-pix was distributed in time and space, improve the grey exponent number of each pixel cell, can demonstrate 256 GTGs, be equivalent to the liquid crystal display of 8bit input and output.
Concrete grammar is between per two original GTGs, by three transition pictures of division increase of sub-pix, and namely at former data end increase by 01,10,11 3 kind of suffix, corresponding three transition pictures.Such as Fig. 1, Fig. 2 and shown in Figure 3, each pixel cell is divided into 16 sub-pixs, and 01,10,11 3 kind of transition picture namely be illustrated in three GTGs of N+0.25, N+0.5, N+0.75 that increase between former GTG N and the GTG N+1.With picture 01, it is dash area among N+1(such as the figure as one group of shown GTG that 4 sub-pixs are arranged in 16 sub-pixs), the GTG that all the other 12 sub-pixs show is the white portion among N(such as the figure), the average GTG of such 16 sub-pixs is exactly N+0.25, and in the 4 continuous frames, each frame gray scale is that one group of sub-pix of N+1 is not identical, makes each sub-pix show a frame N+1 GTG and three frame N GTGs.Through the continuous picture of F1 to F4 four frames, just can reach the visual effect that GTG is N+0.25.GTG is that the displaying principle of N+0.5 and N+0.75 is identical with the displaying principle of above-mentioned N+0.25 GTG, namely is that the GTG of 8 or 12 sub-pixs is arranged respectively in 16 sub-pixs is N+1, and the GTG of all the other sub-pixs is N.
Above-mentioned FRC driving method can be applicable to senior super Wei Chang conversion (Advanced super Dimension Switch, abbreviation ADS) liquid crystal display of pattern, in procedure for displaying, polarity to pixel cell in adjacent two frames is opposite, so the polarity of the electric field that pixel cell is applied also replaces frame by frame.But, because the polyimide (Polyimide of the liquid crystal display of ADS pattern, being called for short PI) stored charge formation electric charge is remaining easily for layer, when using existing FRC driving method, wherein one or more groups sub-pix of a pixel cell always is applied in positive electric field, other one or more groups sub-pix always is applied in negative electric field, will cause to the PI layer of these sub-pixs the accumulation of unipolarity electric charge, originally the metallics that dissociates in the liquid crystal layer is offseted to one side, affect the normal rotation of liquid crystal molecule, cause luminance deviation, produce the bad demonstration phenomenons such as image retention.
Summary of the invention
The embodiment of the invention provides a kind of frame rate conversion (FRC) driving method, has solved the unipolarity charge accumulated that existing FRC driving method causes the PI layer easily, causes the technical matters of the bad demonstration phenomenons such as image retention.
For achieving the above object, embodiments of the invention adopt following technical scheme:
This FRC driving method, the type of drive that adopts point to overturn, the pixel cell that the GTG that is used for that the frame rate conversion is added drives is processed, and described driving method comprises:
At the first frame, first group of sub-pix in the described pixel cell applied voltage;
At the second frame, first group of sub-pix in the described pixel cell applied voltage;
Wherein, described first group of sub-pix is opposite polarity at least 4 sub-pixs of same position between two frames.
Further, this driving method also comprises:
At the 3rd frame, second group of sub-pix in the described pixel cell applied voltage;
At the 4th frame, second group of sub-pix in the described pixel cell applied voltage;
Wherein, described second group of sub-pix is opposite polarity at least 4 sub-pixs of same position between two frames.
Preferably, the GTG that adds in the described frame rate conversion is 01,10,11.
Preferably, equate with the sub-pix quantity of described second group of sub-pix at first group of sub-pix described in the same GTG.
Preferably, described pixel cell is divided into 16 sub-pixs, and the sub-pix quantity of described first group of sub-pix or described second group of sub-pix is 4,8 or 12.
Further, 16 sub-pixs in the described pixel cell are the arrangement of 4 * 4 matrix forms.
Further, in described pixel cell, formed first group of sub-pix with 4 sub-pixs by 1 sub-pix in every row;
Perhaps, form first group of sub-pix with 8 sub-pixs by 2 sub-pixs in every row;
Perhaps, form first group of sub-pix with 12 sub-pixs by 3 sub-pixs in every row.
Compared with prior art, technique scheme provided by the present invention has following advantage: in this FRC driving method, at the first frame, first group of sub-pix in the pixel cell applied voltage; At the second frame, the polarity of this first group of sub-pix can become the opposite polarity polarity with the first frame, again this first group of sub-pix applied voltage, namely in adjacent two frames, respectively opposite polarity same group of sub-pix applied voltage, and execute alive normally equal-sized in adjacent two frames.Therefore, in these sub-pixs, electric charge in adjacent two frame remnants can be cancelled out each other, and has avoided the unipolarity charge accumulated of PI layer and the bad demonstration phenomenons such as image retention that cause, thereby has solved the technical matters that existing FRC driving method produces the phenomenons such as image retention easily.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 to Fig. 3 is the synoptic diagram of the embodiment of existing FRC driving method of the present invention;
The synoptic diagram of the embodiment of the FRC driving method that Fig. 4 to Fig. 6 provides for embodiments of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not paying creative work belongs to the scope of protection of the invention.
Embodiment 1:
Frame rate conversion (FRC) driving method that the embodiment of the invention provides is applied to the liquid crystal display of ADS pattern, adopt the type of drive of some upset, a kind of mode as a upset, also can make the upset of (1+2) line point, namely except the first row, from the per two row upset of the polarity of the second row starting pixel unit once.The pixel cell that the GTG that this FRC driving method is used for that the frame rate conversion is added drives is processed, and adds 01,10,11 3 GTG between per two adjacent GTGs, to realize that 64 GTGs are expanded to 256 GTGs.Pixel cell shown in Figure 4 divides for 16 sub-pixs, take the corresponding GTG N+0.25 of transition picture 01() as example, the FRC driving method of this pixel cell comprises:
S11: at the first frame F1, first group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the first frame F1 picture among Fig. 4,16 sub-pixs in this pixel cell are 4 * 4 matrix forms and arrange, wherein first group of sub-pix is opposite polarity 4 sub-pixs of same position between two frames, specifically by the 1st sub-pix of the 1st row and the 3rd row, form with the 3rd sub-pix of the 2nd row and the 4th row, apply respectively different big or small voltages to this first group of sub-pix and all the other 12 sub-pixs, the GTG that this first group of sub-pix shown is the dash area among N+1(such as the figure), the GTG that all the other 12 sub-pixs show is the white portion among N(such as the figure), the average GTG of this pixel cell is N+0.25.
Understandable, if this moment N=0, namely the GTG that shows of first group of sub-pix is 1, the GTG that all the other 12 sub-pixs show is 0, then only needs apply voltage to first group of sub-pix, need not apply voltage to all the other 12 sub-pixs.
S12: at the second frame F2, first group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the second frame F2 picture among Fig. 4, this first group of sub-pix can become opposite polarity polarity with F1 in the polarity of F2, apply respectively different big or small voltages to above-mentioned first group of sub-pix and all the other 12 sub-pixs, the GTG that this first group of sub-pix shown is N+1, the GTG that all the other 12 sub-pixs show is N, and the average GTG of this pixel cell is N+0.25.This step is compared with above-mentioned steps S11, only is that the polarity of each sub-pix is opposite.
In the FRC driving method that the embodiment of the invention provides, in F1, first group of sub-pix in this pixel cell applied voltage; In F2, more opposite polarity this first group of sub-pix applied voltage, namely in adjacent two frames, respectively opposite polarity same group of sub-pix applied voltage, and the alive size of executing equates also in adjacent two frames.Therefore, in first group of sub-pix, electric charge in adjacent two frame remnants can be cancelled out each other, and has avoided the unipolarity charge accumulated of PI layer and the bad demonstration phenomenons such as image retention that cause, thereby has solved the technical matters that existing FRC driving method produces the phenomenons such as image retention easily.
Further, the FRC driving method that provides of the embodiment of the invention also comprises:
S13: at the 3rd frame F3, second group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the 3rd frame F3 picture among Fig. 4, second group of sub-pix in this pixel cell also is opposite polarity 4 sub-pixs of same position between two frames, equate with the sub-pix quantity of first group of sub-pix, specifically by the 2nd sub-pix of the 1st row and the 3rd row, form with the 4th sub-pix of the 2nd row and the 4th row, apply respectively different big or small voltages to this second group of sub-pix and all the other 12 sub-pixs, the GTG that this second group of sub-pix shown is N+1, the GTG that all the other 12 sub-pixs show is N, and the average GTG of this pixel cell is N+0.25.
S14: at the 4th frame F4, second group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the 4th frame F4 picture among Fig. 4, this second group of sub-pix can become opposite polarity polarity with F3 in the polarity of F4, apply respectively different big or small voltages to above-mentioned second group of sub-pix and all the other 12 sub-pixs, the GTG that this second group of sub-pix shown is N+1, the GTG that all the other 12 sub-pixs show is N, and the average GTG of this pixel cell is N+0.25.This step is compared with above-mentioned steps S13, only is that the polarity of each sub-pix is opposite.
In the FRC driving method that the embodiment of the invention provides, by F1, F2 two frames and F3 afterwards, F4 totally four frames form one group of transition picture, and can circulate and show and to make this pixel cell can reach the visual effect that GTG is N+0.25 by this four frames picture.
Identical with before F1, F2, after F3 in second group of sub-pix in this pixel cell applied voltage; Again opposite polarity this second group of sub-pix being applied voltage in F4, also is respectively opposite polarity same group of sub-pix to be applied equal-sized voltage in adjacent two frames.Therefore, in second group of sub-pix, electric charge in adjacent two frame remnants also can be cancelled out each other, and has avoided equally the unipolarity charge accumulated of PI layer and the bad demonstration phenomenons such as image retention that cause, has solved the technical matters that existing FRC driving method produces the phenomenons such as image retention easily.
Embodiment 2:
Present embodiment is substantially the same manner as Example 1, also is the liquid crystal display that this FRC driving method is applied to the ADS pattern, adopts the type of drive of some upset, and the pixel cell that the GTG that is used for that the frame rate conversion is added drives is processed.Present embodiment is take the corresponding GTG N+0.5 of transition picture 10() as example describes, this FRC driving method comprises:
S21: at the first frame F1, first group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the first frame F1 picture among Fig. 5,16 sub-pixs in this pixel cell are identical with embodiment 1, also be to be 4 * 4 matrix forms to arrange, and first group of sub-pix wherein is opposite polarity 8 sub-pixs of same position between two frames, specifically by the 1st row and the 4th row the 1st, the 3rd sub-pix, with the 2nd row and the 3rd row the 2nd, the 4th sub-pix forms, apply respectively different big or small voltages to this first group of sub-pix and all the other 8 sub-pixs, the GTG that this first group of sub-pix shown is N+1, the GTG that all the other 8 sub-pixs show is N, and the average GTG of this pixel cell is N+0.5.
S22: at the second frame F2, first group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the second frame F2 picture among Fig. 5, this first group of sub-pix can become opposite polarity polarity with F1 in the polarity of F2, apply respectively different big or small voltages to above-mentioned first group of sub-pix and all the other 8 sub-pixs, the GTG that this first group of sub-pix shown is N+1, the GTG that all the other 8 sub-pixs show is N, and the average GTG of this pixel cell is N+0.5.This step is compared with above-mentioned steps S21, only is that the polarity of each sub-pix is opposite.
S23: at the 3rd frame F3, second group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the 3rd frame F3 picture among Fig. 5, second group of sub-pix in this pixel cell also is opposite polarity 8 sub-pixs of same position between two frames, equate with the sub-pix quantity of first group of sub-pix, specifically by the 1st row and the 4th row the 2nd, the 4th sub-pix, with the 2nd row and the 3rd row the 1st, the 3rd sub-pix forms, apply respectively different big or small voltages to this second group of sub-pix and all the other 8 sub-pixs, the GTG that this second group of sub-pix shown is N+1, the GTG that all the other 8 sub-pixs show is N, and the average GTG of this pixel cell is N+0.5.
S24: at the 4th frame F4, second group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the 4th frame F4 picture among Fig. 5, this second group of sub-pix can become opposite polarity polarity with F3 in the polarity of F4, apply respectively different big or small voltages to above-mentioned second group of sub-pix and all the other 8 sub-pixs, the GTG that this second group of sub-pix shown is N+1, the GTG that all the other 8 sub-pixs show is N, and the average GTG of this pixel cell is N+0.5.This step is compared with above-mentioned steps S23, only is that the polarity of each sub-pix is opposite.
In the FRC driving method that the embodiment of the invention provides, by F1, F2, F3, F4 totally four frames form one group of transition picture, and can circulate and show and to make this pixel cell can reach the visual effect that GTG is N+0.5 by this four frames picture.
In the FRC driving method that the embodiment of the invention provides, in F1, first group of sub-pix in this pixel cell applied voltage, in F2, more opposite polarity this first group of sub-pix applied voltage; Afterwards, in F3, second group of sub-pix in this pixel cell applied voltage, in F4, more opposite polarity this second group of sub-pix applied voltage, namely at adjacent two frame F1, F2, and respectively opposite polarity same group of sub-pix applied respectively equal-sized voltage among adjacent two frame F3, the F4.Therefore, in first group of sub-pix and the second group of sub-pix, electric charge in adjacent two frame remnants can both be cancelled out each other, and has avoided the unipolarity charge accumulated of PI layer and the bad demonstration phenomenons such as image retention that cause, thereby has solved the technical matters that existing FRC driving method produces the phenomenons such as image retention easily.
Embodiment 3:
Present embodiment and embodiment 1, embodiment 2 are basic identical, also are the liquid crystal display that this FRC driving method is applied to the ADS pattern, adopt the type of drive of some upset, and the pixel cell that the GTG that is used for that the frame rate conversion is added drives is processed.Present embodiment is take the corresponding GTG N+0.75 of transition picture 11() as example describes, this FRC driving method comprises:
S31: at the first frame F1, first group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the first frame F1 picture among Fig. 6,16 sub-pixs in this pixel cell are identical with embodiment 1, embodiment 2, also be to be 4 * 4 matrix forms to arrange, and first group of sub-pix wherein is opposite polarity 12 sub-pixs of same position between two frames, specifically by the 2nd, the 3rd, the 4th sub-pix of the 1st row and the 3rd row, and the 1st, the 2nd, the 4th sub-pix of the 2nd row and the 4th row forms.Apply respectively different big or small voltages to this first group of sub-pix and all the other 4 sub-pixs, the GTG that this first group of sub-pix shown is N+1, and the GTG that all the other 4 sub-pixs show is N, and the average GTG of this pixel cell is N+0.7.
In fact, the voltage that each sub-pix of F1 applies in the present embodiment, just in time opposite with the F1 among the embodiment 1, be equivalent to 12 sub-pixs beyond first group of sub-pix among the embodiment 1 as first group of sub-pix in the present embodiment, and in addition GTG is the corresponding voltage of N+1; Simultaneously first group of sub-pix among the embodiment 1 as first group of sub-pix, 4 sub-pixs in addition in the present embodiment, and in addition GTG is the corresponding voltage of N.
S32: at the second frame F2, first group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the second frame F2 picture among Fig. 6, this first group of sub-pix can become opposite polarity polarity with F1 in the polarity of F2, apply respectively different big or small voltages to above-mentioned first group of sub-pix and all the other 4 sub-pixs, the GTG that this first group of sub-pix shown is N+1, the GTG that all the other 4 sub-pixs show is N, and the average GTG of this pixel cell is N+0.75.This step is compared with above-mentioned steps S31, only is that the polarity of each sub-pix is opposite.
S33: at the 3rd frame F3, second group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the 3rd frame F3 picture among Fig. 6, second group of sub-pix in this pixel cell also is opposite polarity 12 sub-pixs of same position between two frames, equate with the sub-pix quantity of first group of sub-pix, specifically by the 1st row and the 3rd row the 1st, the 3rd, the 4th sub-pix, with the 2nd row and the 4th row the 1st, the 2nd, the 3rd sub-pix forms, apply respectively different big or small voltages to this second group of sub-pix and all the other 4 sub-pixs, the GTG that this second group of sub-pix shown is N+1, the GTG that all the other 4 sub-pixs show is N, and the average GTG of this pixel cell is N+0.75.Accordingly, the voltage that each sub-pix of F3 applies in the present embodiment, also be opposite with the F3 among the embodiment 1, be that second group of sub-pix in the present embodiment is corresponding to 12 sub-pixs beyond second group of sub-pix among the embodiment 1, second group of sub-pix, 4 sub-pixs in addition are corresponding to second group of sub-pix among the embodiment 1 in the present embodiment simultaneously, and the magnitude of voltage that still applies is different.
S34: at the 4th frame F4, second group of sub-pix in the pixel cell applied voltage.
Concrete, shown in the 4th frame F4 picture among Fig. 6, this second group of sub-pix can become opposite polarity polarity with F3 in the polarity of F4, apply respectively different big or small voltages to above-mentioned second group of sub-pix and all the other 4 sub-pixs, the GTG that this second group of sub-pix shown is N+1, the GTG that all the other 4 sub-pixs show is N, and the average GTG of this pixel cell is N+0.75.This step is compared with above-mentioned steps S33, only is that the polarity of each sub-pix is opposite.
In the FRC driving method that the embodiment of the invention provides, by F1, F2, F3, F4 totally four frames form one group of transition picture, and can circulate and show and to make this pixel cell can reach the visual effect that GTG is N+0.75 by this four frames picture.
In the FRC driving method that the embodiment of the invention provides, in F1, first group of sub-pix in this pixel cell applied voltage, in F2, more opposite polarity this first group of sub-pix applied voltage; Afterwards, in F3, second group of sub-pix in this pixel cell applied voltage, in F4, more opposite polarity this second group of sub-pix applied voltage, namely at adjacent two frame F1, F2, and respectively opposite polarity same group of sub-pix applied respectively equal-sized voltage among adjacent two frame F3, the F4.Therefore, in first group of sub-pix and the second group of sub-pix, electric charge in adjacent two frame remnants can both be cancelled out each other, and has avoided the unipolarity charge accumulated of PI layer and the bad demonstration phenomenons such as image retention that cause, thereby has solved the technical matters that existing FRC driving method produces the phenomenons such as image retention easily.
Above-mentioned three embodiment are divided into 16 sub-pixs with a pixel cell, the sub-pix that also a pixel cell can be divided in other embodiments 4,8 or other quantity is as long as the average GTG in pixel cell can reach respectively N+0.25, N+0.5, N+0.75.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (7)
1. a frame rate conversion driving method adopts a type of drive of upset, it is characterized in that, the pixel cell that the GTG that is used for that the frame rate conversion is added drives is processed, and comprising:
At the first frame, first group of sub-pix in the described pixel cell applied voltage;
At the second frame, first group of sub-pix in the described pixel cell applied voltage;
Wherein, described first group of sub-pix is opposite polarity at least 4 sub-pixs of same position between two frames.
2. driving method according to claim 1 is characterized in that, also comprises:
At the 3rd frame, second group of sub-pix in the described pixel cell applied voltage;
At the 4th frame, second group of sub-pix in the described pixel cell applied voltage;
Wherein, described second group of sub-pix is opposite polarity at least 4 sub-pixs of same position between two frames.
3. driving method according to claim 1 and 2 is characterized in that, the GTG that adds in the described frame rate conversion is 01,10,11.
4. driving method according to claim 3 is characterized in that: equate with the sub-pix quantity of described second group of sub-pix at first group of sub-pix described in the same GTG.
5. driving method according to claim 4, it is characterized in that: described pixel cell is divided into 16 sub-pixs, and the sub-pix quantity of described first group of sub-pix is 4,8 or 12.
6. driving method according to claim 5 is characterized in that: 16 sub-pixs in the described pixel cell are 4 * 4 matrix forms and arrange.
7. driving method according to claim 6 is characterized in that: in described pixel cell, be made of first group of sub-pix with 4 sub-pixs 1 sub-pix in every row;
Perhaps, form first group of sub-pix with 8 sub-pixs by 2 sub-pixs in every row;
Perhaps, form first group of sub-pix with 12 sub-pixs by 3 sub-pixs in every row.
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| WO2019047687A1 (en) * | 2017-09-11 | 2019-03-14 | 惠科股份有限公司 | Method for driving display panel and display device |
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