CN101192386A - Method for driving LCD device and its related device - Google Patents
Method for driving LCD device and its related device Download PDFInfo
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- CN101192386A CN101192386A CN 200610162536 CN200610162536A CN101192386A CN 101192386 A CN101192386 A CN 101192386A CN 200610162536 CN200610162536 CN 200610162536 CN 200610162536 A CN200610162536 A CN 200610162536A CN 101192386 A CN101192386 A CN 101192386A
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Abstract
A method for driving a liquid crystal display comprises the following steps: display data corresponding to one pixel of the liquid crystal display is obtained and the gray value of the driving data of a first frame in the display data is compared to that of the driving data of a second frame; when the difference of the gray value between the driving data of the first frame and the driving data of the second frame is more than a preset value, the driving data of the second frame is divided into the driving data in a plurality of sub frames; the gray values of the driving data in a plurality of sub frames are respectively adjusted according to the gray value of the driving data of the second frame, and the driving data in a plurality of sub frames is displayed in sequence by the pixel.
Description
Technical field
The present invention refers to a kind of method and relevant apparatus thereof that is used for driving LCD, refer to especially a kind of can be according to the gray value differences distance of consecutive frame, dynamically whether decision inserts the method and the relevant apparatus thereof of the gray-scale value of subframe and subframe.
Background technology
LCD has that external form is frivolous, power consumption is few and characteristic such as radiationless pollution, has been widely used on the information products such as computer system, mobile phone, PDA(Personal Digital Assistant).The principle of work of LCD utilizes liquid crystal molecule under different ordered states, light had different polarizations or refraction effect, therefore can control the transmission amount of light via the liquid crystal molecule of different ordered states, further produce the output light of varying strength, and the red, green, blue of different gray-scale intensities.
Please refer to Fig. 1, Fig. 1 is known thin film transistor (TFT) (Thin Film Transistor, TFT) synoptic diagram of LCD 10.LCD 10 comprises a display panels (LCD Panel) 100, one control circuit 102, a data line signal output circuit 104, one scan line signal output apparatus 106 and a voltage generator 108.Display panels 100 is made of two substrates (Substrate), and is filled with liquid crystal material (Liquid Crystal) between two substrates.One substrate is provided with many data lines (Data Line) 110, many (the Scan Line of the sweep trace perpendicular to data line 110, or title gate line, Gate Line) 112 and a plurality of thin film transistor (TFT) 114, be used for providing usefulness voltage (Vcom) altogether with electrode (Common Electrode) and be provided with altogether via voltage generator 108 in another substrate.For ease of explanation, only show four thin film transistor (TFT)s 114 among Fig. 1, in fact, each data line 110 all is connected with a thin film transistor (TFT) 114 with the junction (Intersection) of sweep trace 112 in the display panels 100, that is thin film transistor (TFT) 114 is distributed on the display panels 100 in the mode of matrix, each data line 110 is corresponding to row (Column) of Thin Film Transistor-LCD 10, and sweep trace 112 is corresponding to the delegation (Row) of Thin Film Transistor-LCD 10, and each thin film transistor (TFT) 114 is corresponding to a pixel (Pixel).In addition, the circuit characteristic that two substrates constituted of display panels 100 can be considered an equivalent electric capacity 116.
Details are as follows for the drive principle of known Thin Film Transistor-LCD 10, when control circuit 102 receives horizontal-drive signal (Horizontal Synchronization) 118 and vertical synchronizing signal (Vertical Synchronization) 120, control circuit 102 can produce corresponding control signal and input to data line signal output circuit 104 and scanning-line signal output circuit 106 respectively, data line signal output circuit 104 and scanning-line signal output circuit 106 can produce input signal to different data line 110 and sweep trace 112 according to this control signal then, thereby the potential difference (PD) at the conducting of control TFT 114 and equivalent capacity 116 two ends, and change the arrangement and the corresponding light penetration amount of liquid crystal molecule further, so that video data 122 is shown on the panel.For instance, 106 pairs of sweep traces of scanning-line signal output circuit, 112 inputs, one pulse wave makes thin film transistor (TFT) 114 conductings, therefore the signal of 104 input data lines 110 of data line signal output circuit can be imported equivalent capacity 116 via thin film transistor (TFT) 114, therefore reaches gray scale (Gray Level) state of the corresponding pixel of control.In addition, input to the signal magnitude of data line 110, can produce different gray scale sizes by control data line signal output apparatus 104.
Because the physical characteristics of liquid crystal is similar to electric capacity, makes liquid crystal have the too slow problem of reaction velocity; On the other hand, type of drive compared to the crt display pulsed, voltage of LCD keeps the type of drive of (hold-type) continuously, causes the phenomenon of the image border generation motion blur (Motion Blur) of mobile object (Moving Subject).In order to reduce the motion blur degree on the animation, known technology provides a kind of black insertion technology, it shortens frame (Frame) and inserts the subframe of black or low gray-scale value in frame and interframe, and to shorten the view data pulse, title is class pulsed lcd technology again.In simple terms, black insertion technology refers between consecutive frame, and the fixing gray-scale value that inserts is 0 or the subframe of relatively low gray-scale value.
Please refer to Fig. 2 and Fig. 3, Fig. 2 is known in the synoptic diagram that a pixel realizes black insertion technology, and Fig. 3 is the light intensity synoptic diagram that this pixel produced.Wherein, oblique line is partly represented driving data P0, P1, the P2... that this pixel is received in each frame time (Frame Time), and driving data P0, P1, P2... correspond respectively to frame F0, F1, F2....Therefore, as shown in Figure 2, before next driving data input, (gray scale) value of driving data can be got back to 0 (or relatively low value).In this case, the light intensity variation that pixel showed promptly is similar to pulsed output.
Can reduce the motion blur degree by black insertion technology, but because the restriction of liquid crystal response characteristic, when pixel gray-scale displayed value changes, liquid crystal cells needs one period response time (Response Time) to reach the correct gray-scale value that desire shows, thereby cause always having partly the edge can present multiple border phenomenon coming out, particularly when the contrast of picture was big, multiple border phenomenon was obvious more.For instance, if being bright object, moves an animation in the lower background of brightness, then black insertion technology can be eliminated the motion blur problems of this movement of objects direction trailing edge, but leading edge in this movement of objects direction, can be because long relation of the response time of liquid crystal cells presents multiple border phenomenon.Similarly, if an animation is that a darker object moves in the higher background of brightness, then black insertion technology can be eliminated the motion blur problems of this movement of objects direction leading edge, but at the trailing edge of this movement of objects direction, can be because long relation of the response time of liquid crystal cells presents multiple border phenomenon.
Therefore,, tend to produce multiple border phenomenon, cause picture quality effectively to promote in the slower system of liquid crystal reaction velocity though known black insertion technology can reduce the motion blur degree.In addition, as shown in Figure 3, known black insertion technology makes only correct display gray scale data in the frame time of half of pixel, and second half frame time to be gray-scale value be 0 black picture.In other words, black insertion technology can make whole picture mean flow rate reduce by half, and influences image effect.
Summary of the invention
Therefore, fundamental purpose of the present invention promptly is to provide a kind of method and relevant apparatus thereof that is used for driving LCD.
The present invention discloses a kind of method that is used for driving LCD, includes the video data of obtaining corresponding to a pixel of this LCD; The gray-scale value of one first frame driving data and one second frame driving data in this video data relatively; Gray value differences between this first frame driving data and this second frame driving data is divided into a plurality of sub-frame drive data with this second frame driving data apart from greater than a preset value time; According to the gray-scale value of this second frame driving data, adjust the gray-scale value of these a plurality of sub-frame drive data respectively; And show this a plurality of sub-frame drive data in regular turn by this pixel.
The present invention also discloses a kind of pixel driving device that is used for a LCD, includes a receiving end, is used for receiving the video data corresponding to a pixel of this LCD; One comparing unit is coupled to this receiving end, is used for the gray-scale value of one first frame driving data and one second frame driving data in this video data relatively; One cutting unit is coupled to this comparing unit and this receiving end, is used for gray value differences between this first frame driving data and this second frame driving data apart from greater than a preset value time, and this second frame driving data is divided into a plurality of sub-frame drive data; One adjustment unit is coupled to this cutting unit and this receiving end, is used for gray-scale value according to this second frame driving data, adjusts the gray-scale value of these a plurality of sub-frame drive data respectively; And an output unit, be coupled to this adjustment unit, be used for showing this a plurality of sub-frame drive data in regular turn by this pixel.
The present invention also discloses a kind of pixel driving device that is used for a LCD, includes a receiving end, is used for receiving the video data corresponding to a pixel of this LCD; One first memory buffer is coupled to this receiving end, is used for storing one first frame driving data in this video data; One logical block is coupled to this receiving end and this first memory buffer, is used for producing one first sub-frame drive data and one second sub-frame drive data according to the gray value differences distance between one second frame driving data in this first frame driving data and this video data; One second memory buffer is coupled to this logical block, is used for storing this second sub-frame drive data; And an output unit, be coupled to this logical block and this second memory buffer, be used for showing these first sub-frame drive data and this second sub-frame drive data in regular turn by this pixel.
Description of drawings
Fig. 1 is the synoptic diagram of known Thin Film Transistor-LCD.
Fig. 2 is the synoptic diagram of known black insertion technology.
Fig. 3 is the light intensity synoptic diagram corresponding to Fig. 2.
Fig. 4 is used for driving the process flow diagram of LCD for one embodiment of the invention.
Fig. 5 shows the embodiment synoptic diagram according to flow process output driving data to a pixel of Fig. 4.
Fig. 6 be corresponding to Fig. 5 the light intensity synoptic diagram.
Fig. 7 shows the embodiment synoptic diagram according to flow process output driving data to a pixel of Fig. 4.
Fig. 8 is the light intensity synoptic diagram corresponding to Fig. 7.
Fig. 9 is used for the functional block diagram of the pixel driving device of a LCD for one embodiment of the invention.
Figure 10 is used for the functional block diagram of the pixel driving device of a LCD for one embodiment of the invention.
Figure 11 and Figure 12 show the scanning sequency synoptic diagram a when panel is divided into upper and lower two parts output continuous pictures respectively.
Figure 13 is presented under the condition of 60Hz picture update rate, corresponding to the synoptic diagram of incoming frame sequence, output frame sequence and the related data access context of the pixel driving device of Figure 10.
The main element symbol description
10 Thin Film Transistor-LCDs
100 display panels
102 control circuits
104 data line signal output circuits
106 scanning-line signal output circuits
108 voltage generators
110 data lines
112 sweep traces
114 thin film transistor (TFT)s
116 equivalent capacitys
118 horizontal-drive signals
120 vertical synchronizing signals
122 video datas
40 flow processs
400,402,404,406,408,410,412 steps
90,20 pixel driving devices
900,200 receiving ends
902 comparing units
904 cutting units
906 adjustment units
908,20 output units
202 first memory buffer
204 logical blocks
206 second memory buffer
210 memory buffer control modules
The DA first sub-frame drive data
The DB second sub-frame drive data
The DS video data
30 panels
300 panel upper half parts
302 panel lower portions
FP0, FP1 picture
FB1_W, FB1_R, FB2_W, FB2_R, WDA waveform
Vcom voltage
P0, P1, P2... driving data
F0, F1, F2..., FD0, FD1, FD2... frame
PD_S1, PD_S2, PD3, PD4 sub-frame drive data
Embodiment
Please refer to Fig. 4, Fig. 4 is used for driving the synoptic diagram of the flow process 40 of LCD for one embodiment of the invention.Flow process 40 comprises following steps:
Step 400: beginning.
Step 402: obtain video data corresponding to a pixel of this LCD.
Step 404: the gray-scale value of one first frame driving data and one second frame driving data in this video data relatively.
Step 406: gray value differences between this first frame driving data and this second frame driving data is divided into a plurality of sub-frame drive data with this second frame driving data apart from greater than a preset value time.
Step 408:, adjust the gray-scale value of these a plurality of sub-frame drive data respectively according to the gray-scale value of this second frame driving data.
Step 410: show this a plurality of sub-frame drive data in regular turn by this pixel.
Step 412: finish.
According to flow process 40, the present invention apart from greater than preset value the time, is divided into a plurality of sub-frame drive data with the second frame driving data in the gray value differences of the first frame driving data and the second frame driving data.Then, according to the original gray value of the second frame driving data, adjust the gray-scale value of each sub-frame drive data.At last, show each sub-frame drive data in regular turn.Preferably, the first frame driving data and the second frame driving data are corresponding to adjacent two frames, and the sequential of the first frame driving data is led over the sequential of the second frame driving data; Step 408 is by black plug, pre-dumping (Pre-Shoot) or cross the modes such as (Over Drive) of driving, and according to the original gray value of the second frame driving data, adjust the gray-scale value of each sub-frame drive data, make the average gray value of all sub-frame drive data level off to the original gray value of the second frame driving data, to keep output brightness.In addition, in the step 408, the present invention also can adjust the duration (Duration) of each sub-frame drive data.
Therefore, when flow process 40 driving pixels show a frame driving data, can be apart from greater than preset value the time in the gray value differences between this frame driving data and former frame driving data, this frame driving data is divided into a plurality of sub-frame drive data, and with black plug, pre-dumping (Pre-Shoot) or cross and drive modes such as (Over Drive), adjust the gray-scale value of each sub-frame drive data, make the average gray value of all sub-frame drive data level off to original gray value, to keep picture brightness, increase picture quality.In other words, the present invention is according to the gray value differences distance of consecutive frame driving data, judges whether to insert black or low gray scale, pre-dumping, crosses and subframe such as drive.Certainly, the present invention can further set several threshold values corresponding to the gray value differences distance.For example, when gray value differences apart from greater than a first threshold time, insert black or low gray scale subframe, and, then insert the pre-dumping subframe when gray value differences distance during less than first threshold but greater than one second threshold value.In simple terms, the present invention judges whether to insert subframe according to the gray value differences distance of consecutive frame driving data, and the gray-scale value of the subframe inserted of decision.In comparison, in known technology, no matter the gray value differences between consecutive frame is apart from being what, known black insertion technology all can be fixed and insert gray-scale value is 0 or with respect to the subframe of the low gray scale of input signal, consequently has the problem of multiple border phenomenon.
Because the present invention is according to the gray value differences distance of consecutive frame, dynamically whether decision inserts the gray-scale value of subframe and subframe, removes and can reduce the motion blur degree, and can avoid the problem of multiple border phenomenon.For instance, if being bright object, moves an animation in the lower background of brightness, trailing edge at this movement of objects direction, the present invention can be by inserting black or low gray scale subframe elimination motion blur, and at the leading edge of this movement of objects direction, then can or cross (picture is deceived in the non-insertion) mode of driving and avoid the problem of multiple border phenomenon by pre-dumping.Similarly, if an animation is that a darker object moves in the higher background of brightness, then the present invention can eliminate the motion blur problems of this movement of objects direction leading edge by inserting black or low gray scale subframe, and at the trailing edge of this movement of objects direction, then can or cross (picture is deceived in the non-insertion) mode of driving and avoid the problem of multiple border phenomenon by pre-dumping.
For instance, please refer to Fig. 5 and Fig. 6, Fig. 5 shows the embodiment synoptic diagram of flow process 40 output driving data to pixels according to the present invention, and Fig. 6 is the light intensity synoptic diagram that this pixel produced.In Fig. 5, transverse axis express time, the longitudinal axis are represented the frame driving data PD0 corresponding to frame FD0, FD1, FD2..., the gray-scale value of PD1, PD2....As shown in Figure 5, the gray-scale value of frame driving data PD0 and PD1 is all V7, does not promptly have gray scale value difference distance between the two, thereby can not cut apart frame driving data PD1.The back of frame driving data PD1 is frame driving data PD2, because the gray value differences of frame driving data PD1 and PD2 distance (| V2-V7|) excessive (surpassing a preset value TH1), then the present invention can be divided into sub-frame drive data PD_S1 and PD_S2 with frame driving data PD2, and the gray-scale value of sub-frame drive data PD_S1 is made as V1, and the gray-scale value of sub-frame drive data PD_S2 is made as V3.In other words because the gray value differences of frame driving data PD1 and PD2 is apart from greater than preset value TH1, shown picture be by bright to dark, so the gray-scale value of sub-frame drive data PD_S1 is made as V1 (V1 is lower than V2), arrive dark situation so that rapid reaction is bright; Simultaneously, the gray-scale value of sub-frame drive data PD_S2 is made as V3 (V3 is higher than V2), the gray-scale value that is lost with compensated frame driving data PD2.Next, because the gray-scale value of frame driving data PD2 and PD3 is all V2, does not promptly have gray scale value difference distance between the two, thereby can not cut apart frame driving data PD3.Because the gray value differences of frame driving data PD3 and PD4 distance (| V2-V5|) excessive (surpassing a preset value TH2), then the present invention can be divided into sub-frame drive data PD_S3 and PD_S4 with frame driving data PD4, and the gray-scale value of sub-frame drive data PD_S3 is made as V4, and the gray-scale value of sub-frame drive data PD_S4 is made as V6.In other words because the gray value differences of frame driving data PD3 and PD4 is apart from greater than preset value TH2, shown picture be by dark to bright, so the gray-scale value of sub-frame drive data PD_S3 is made as V4 (V4 is lower than V5), make the liquid crystal antedating response in the pre-dumping mode; Simultaneously, the gray-scale value of sub-frame drive data PD_S4 is made as V6 (V6 is higher than V5), makes the grey scale pixel value faster reaction to its target to quicken liquid crystal to cross the mode of driving.
Therefore, as shown in Figure 5, the present invention is according to the gray value differences distance of present frame driving data and former frame driving data, whether decision inserts subframe, and adjust the gray-scale value of the subframe inserted, and therefore not only can solve the problem of motion blur, more can solve the problem on multiple border.In Fig. 6, frame FD1 to FD2 represents by bright moment deepening, because the gray-scale value of sub-frame drive data PD_S1 is lower than the gray-scale value of frame driving data PD2, therefore presents the response of class pulsed and reduction motion blur degree; And frame FD3 to FD4 represents to be brightened by dark moment, then carries out the operation of pre-dumping by sub-frame drive data PD_S3, and carries out the operation of driving by sub-frame drive data PD_S4, therefore makes the grey scale pixel value faster reaction to its target.
The present invention is by the gray-scale value of more adjacent two frame driving data, the gray-scale value that judges whether to cut apart the frame driving data and adjust the sub-frame drive data, certainly, this area tool knows that usually the knowledgeable can be according to different system requirements, suitably change embodiments of the present invention, and be not limited to aforesaid example (Fig. 5 and Fig. 6).For instance, please refer to Fig. 7 and Fig. 8, Fig. 7 shows the embodiment synoptic diagram of flow process 40 output driving data to pixels according to the present invention, and Fig. 8 is the light intensity synoptic diagram that this pixel produced.The embodiment of Fig. 7 is different with the embodiment of Fig. 5, and to be in the gray-scale value of the frame driving data PD_S1 of Fig. 7 be 0, and sub-frame drive data PD_S3 and PD_S4 all carried out the operation of driving, and its pairing brightness changes promptly as shown in Figure 8.
Realization about flow process 40 of the present invention please refer to Fig. 9.Fig. 9 is used for the functional block diagram of the pixel driving device 90 of a LCD for one embodiment of the invention.Pixel driving device 90 is used for realization flow 40, and it comprises a receiving end 900, a comparing unit 902, a cutting unit 904, an adjustment unit 906 and an output unit 908.Receiving end 900 is used for receiving the video data corresponding to a pixel.Comparing unit 902 is coupled to receiving end 900, is used for the gray value differences distance of one first frame driving data and one second frame driving data in the video data that comparison receiving end 900 received.Cutting unit 904 is coupled to comparing unit 902 and receiving end 900, is used in the gray value differences of the first frame driving data and the second frame driving data the second frame driving data being divided into a plurality of sub-frame drive data apart from greater than a preset value time.Adjustment unit 906 is coupled to cutting unit 904 and receiving end 900, is used for gray-scale value according to the second frame driving data, adjusts the gray-scale value of each sub-frame drive data.Output unit 908 is coupled to adjustment unit 906, is used for showing in regular turn each sub-frame drive data.
Therefore, in pixel driving device 90, cutting unit 904 can be according to the comparative result of comparing unit 902, apart from greater than preset value the time, the second frame driving data is divided into a plurality of sub-frame drive data in the gray value differences of the first frame driving data and the second frame driving data.Then, adjustment unit 906 can be adjusted the gray-scale value of each sub-frame drive data according to the original gray value of the second frame driving data.At last, output unit 908 can show each sub-frame drive data in regular turn.Preferably, the first frame driving data and the second frame driving data are corresponding to adjacent two frames, and the sequential of the first frame driving data is led over the sequential of the second frame driving data.Adjustment unit 906 can be by black plug, pre-dumping, cross mode such as drive, and according to the original gray value of the second frame driving data, adjust the gray-scale value of each sub-frame drive data, make the average gray value of all sub-frame drive data level off to the original gray value of the second frame driving data, to keep output brightness.In addition, adjustment unit 906 can comprise a time adjustment unit, is used for adjusting the duration of sub-frame drive data.
Therefore, when driving pixels and show a frame driving data via pixel driving device 90, cutting unit 904 can during greater than preset value, be divided into a plurality of sub-frame drive data with this frame driving data in the distance of the gray value differences between this frame driving data and former frame driving data; And by adjustment unit 906 with black plug, pre-dumping, cross mode such as drive, adjust the gray-scale value of each sub-frame drive data, make the average gray value of all sub-frame drive data level off to the original gray value of the second frame driving data,, increase picture quality to keep picture brightness.
What pay special attention to is, pixel driving device 90 shown in Figure 9 is used for realization flow 40, with gray-scale value according to adjacent two frame driving data, and the gray-scale value that judges whether to cut apart the frame driving data and adjust the sub-frame drive data.Certainly, this area tool knows that usually the knowledgeable can be according to flow process 40, the pixel driving device of design compliance with system demand.
For instance, please refer to Figure 10, Figure 10 is used for the functional block diagram of the pixel driving device 20 of a LCD for one embodiment of the invention.Pixel driving device 20 includes a receiving end 200, one first memory buffer 202, a logical block 204, one second memory buffer 206, an output unit 208 and a memory buffer control module 210.Receiving end 200 is used for receiving the video data DS corresponding to a pixel.First memory buffer 202 is coupled to receiving end 200, is used for storing one first frame driving data among the video data DS.Logical block 204 is coupled to the receiving end 200 and first memory buffer 202, be used for according to the gray value differences distance between one second frame driving data among the first frame driving data and the video data DS, produce one first sub-frame drive data DA and one second sub-frame drive data DB, the length of the first sub-frame drive data DA and the second sub-frame drive data DB is respectively half of the second frame driving data.Second memory buffer 206 is coupled to logical block 204, is used for storing the second sub-frame drive data DB.Output unit 208 is coupled to the logical block 204 and second memory buffer 206, is used for showing in regular turn the first sub-frame drive data DA and the second sub-frame drive data DB.Memory buffer control module 210 is coupled to first memory buffer 202 and second memory buffer 206, is used for controlling first memory buffer 202 and second memory buffer 206.Wherein, the first frame driving data and the second frame driving data are corresponding to adjacent two frames, and the sequential of the first frame driving data is led over the sequential of the second frame driving data.In other words, the gray-scale value of logical block 204 more adjacent two frame driving data is exported the first sub-frame drive data DA and the second sub-frame drive data DB according to this; Then, second memory buffer, the 206 temporary second sub-frame drive data DB, with the sequential time delay half frame time with the second sub-frame drive data DB, then output unit 208 can be exported the first sub-frame drive data DA and the second sub-frame drive data DB in regular turn.
In simple terms, in pixel driving device 20, logical block 204 can produce the first sub-frame drive data DA and the second sub-frame drive data DB according to the gray value differences distance of the first frame driving data and the second frame driving data.For instance, if when the gray value differences of the first frame driving data and second frame driving data distance is very little, the gray-scale value that then can set the first sub-frame drive data DA and the second sub-frame drive data DB all equals the gray-scale value of the second frame driving data; And when the gray value differences of the first frame driving data and the second frame driving data apart from greater than a certain preset value the time, then can black plug, pre-dumping, cross mode such as drive, set the gray-scale value of the first sub-frame drive data DA and the second sub-frame drive data DB respectively, and make the average gray value of the first sub-frame drive data DA and the second sub-frame drive data DB level off to the original gray value of the second frame driving data.Thus, if a picture is by bright deepening, then can to set the gray-scale value of the first sub-frame drive data DA be 0 or relatively low value to logical block 204, to eliminate the phenomenon of motion blur, and improve the gray-scale value of the second sub-frame drive data DB, the brightness of being lost with compensation.On the contrary, if a picture is by secretly brightening, then can to set the gray-scale value of the first sub-frame drive data DA be a pre-dumping value to logical block 204, and the gray-scale value of setting the second sub-frame drive data DB is one to cross the value of driving, and makes grey scale pixel value comparatively fast reach its target to quicken the liquid crystal reaction.
About the realization of pixel driving device 20, can only meet aforesaid function and get final product.For instance, logical block 204 is realized that by System on chip or by the arithmetic element that can realize table lookup function it can also comprise a time adjustment unit, is used for adjusting the duration of the first sub-frame drive data DA and the second sub-frame drive data DB.
On the other hand, first memory buffer 202 and second memory buffer 206 are used for storing the first frame driving data and the second sub-frame drive data DB respectively.Therefore, the size of first memory buffer 202 and second memory buffer 206 should meet the size of a frame driving data.Wherein, because the length of the second sub-frame drive data DB is half of length of the second frame driving data.Therefore, for saving system resource, can be that upper and lower two parts scan in regular turn with a picture segmentation, then the storage size of second memory buffer 206 is half of storage size of first memory buffer 202, asks for an interview following explanation.At first, please refer to Figure 11 and Figure 12, Figure 11 and Figure 12 show the scanning sequency synoptic diagram a when panel 30 is divided into upper and lower two parts 300,302 output continuous pictures FP0, FP1 respectively.In Figure 11 and Figure 12, numeral 1 to 2H is represented the order that scans, as can be known for upper and lower half part 300,302, its pixel drive input sequence is two partly to prolong level separately and vertical direction scans one by one, but then is the arrangement of taking alternating expression for the same seat punctuate of upper and lower half part 300,302.In this case, the operational scenario of pixel driving device 20 promptly as shown in figure 13.Figure 13 is presented under the condition of 60Hz picture update rate, corresponding to the synoptic diagram of incoming frame sequence, output frame sequence and the related data access context of pixel driving device 20.Wherein, waveform FB1_W represents the data that first memory buffer 202 is received, waveform FB1_R represents the data that first memory buffer 202 is exported, waveform FB2_W represents the data that second memory buffer 206 is received, waveform FB2_R represents the data that second memory buffer 206 is exported, and waveform WDA presentation logic unit 204 exports the data of output unit 208 to.In addition, data F0T represents among the frame F0 data corresponding to the first half 300, and F0B represents among the frame F0 that corresponding to the data of the latter half 302, other data all can not given unnecessary details at this by that analogy.As shown in Figure 13, the complete frame data of first memory buffer, 202 accesses, and half picture of 206 accesses of second memory buffer.In this case, the total memory size of first memory buffer 202 and second memory buffer 206 is 1.5 times a frame data amount, thereby can save system resource.
As previously mentioned, because the physical characteristics of liquid crystal is similar to electric capacity, make liquid crystal have the too slow problem of reaction velocity; On the other hand, compared to the type of drive of crt display pulsed, voltage of LCD is the type of drive of maintenance continuously, causes the phenomenon of the image border generation motion blur of mobile object.Known black insertion technology is fixing, and to insert gray-scale value be 0 or the subframe of relatively low gray-scale value, though can reduce the motion blur degree, can make whole picture mean flow rate reduce by half, and influences image effect.And because the restriction of liquid crystal response characteristic, when pixel gray-scale displayed value changed, liquid crystal cells needed one period response time reaching the correct gray-scale value that desire shows, thereby causes always having the part edge multiple border phenomenon can occur.That compares is following, when the present invention drives pixel and shows a frame driving data, gray value differences distance according to the consecutive frame driving data, judge whether the frame driving data is divided into a plurality of sub-frame drive data, and with black plug, pre-dumping, cross mode such as drive, adjust the gray-scale value of each sub-frame drive data, make the average gray value of all sub-frame drive data level off to original gray value, to keep picture brightness, increase picture quality.In other words, the present invention is according to the gray value differences distance of consecutive frame, and dynamically whether decision inserts the gray-scale value of subframe and subframe, removes and can reduce the motion blur degree, avoids also can keeping picture brightness outside the phenomenon of multiple border, increases picture quality.
The above only is the preferred embodiments of the present invention, and all equivalences of carrying out according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (27)
1. method that is used for driving LCD includes:
Obtain video data corresponding to a pixel of this LCD;
The gray-scale value of one first frame driving data and one second frame driving data in this video data relatively;
Gray value differences between this first frame driving data and this second frame driving data is divided into a plurality of sub-frame drive data with this second frame driving data apart from greater than a preset value time;
According to the gray-scale value of this second frame driving data, adjust the gray-scale value of these a plurality of sub-frame drive data respectively; And
Show this a plurality of sub-frame drive data in regular turn by this pixel.
2. the method for claim 1, wherein this first frame driving data and this second frame driving data are corresponding to adjacent two frames.
3. the method for claim 1, wherein the sequential of this first frame driving data is led over the sequential of this second frame driving data.
4. the method for claim 1 is divided into two subframe driving data with this second frame driving data when wherein the distance of the gray value differences between this first frame driving data and this second frame driving data is greater than this preset value.
5. the method for claim 1, wherein adjust the gray-scale value of the gray-scale value of these a plurality of sub-frame drive data respectively according to this second frame driving data according to the gray-scale value of this second frame driving data, adjust the gray-scale value of these a plurality of sub-frame drive data respectively, make the gray-scale value of the average gray value of these a plurality of sub-frame drive data and this second frame driving data close.
6. the method for claim 1 wherein comprises the duration of adjusting these a plurality of sub-frame drive data respectively according to the gray-scale value that the gray-scale value of this second frame driving data is adjusted these a plurality of sub-frame drive data respectively.
7. the method for claim 1, wherein the gray-scale value of adjusting these a plurality of sub-frame drive data respectively according to the gray-scale value of this second frame driving data comprises the gray-scale value according to this second frame driving data, and the gray-scale value of the most preceding sub-frame drive data of these a plurality of sub-frame drive data is set at gray-scale value less than this second frame driving data.
8. method as claimed in claim 7, it also comprises the gray-scale value of setting sub-frame drive data in these a plurality of sub-frame drive data, makes the average gray value of the gray-scale value of the gray-scale value of these sub-frame drive data and these the most preceding sub-frame drive data level off to the gray-scale value of this second frame driving data.
9. the method for claim 1, wherein the gray-scale value of adjusting these a plurality of sub-frame drive data respectively according to the gray-scale value of this second frame driving data comprises the gray-scale value according to this second frame driving data, and the gray-scale value of the most preceding sub-frame drive data of these a plurality of sub-frame drive data is set at gray-scale value greater than this second frame driving data.
10. pixel driving device that is used for a LCD includes:
One receiving end is used for receiving the video data corresponding to a pixel of this LCD;
One comparing unit is coupled to this receiving end, is used for the gray-scale value of one first frame driving data and one second frame driving data in this video data relatively;
One cutting unit is coupled to this comparing unit and this receiving end, is used for gray value differences between this first frame driving data and this second frame driving data apart from greater than a preset value time, and this second frame driving data is divided into a plurality of sub-frame drive data;
One adjustment unit is coupled to this cutting unit and this receiving end, is used for gray-scale value according to this second frame driving data, adjusts the gray-scale value of these a plurality of sub-frame drive data respectively; And
One output unit is coupled to this adjustment unit, is used for showing this a plurality of sub-frame drive data in regular turn by this pixel.
11. pixel driving device as claimed in claim 10, wherein this first frame driving data and this second frame driving data are corresponding to adjacent two frames.
12. pixel driving device as claimed in claim 10, the wherein sequential of leading this second frame driving data of the sequential of this first frame driving data.
13. pixel driving device as claimed in claim 10, wherein this cutting unit is used for gray value differences between this first frame driving data and this second frame driving data apart from greater than this preset value the time, and this second frame driving data is divided into two subframe driving data.
14. pixel driving device as claimed in claim 10, wherein this adjustment unit is used for the gray-scale value according to this second frame driving data, adjust the gray-scale value of these a plurality of sub-frame drive data respectively, make the gray-scale value of the average gray value of these a plurality of sub-frame drive data and this second frame driving data close.
15. pixel driving device as claimed in claim 10, wherein this adjustment unit comprises a time adjustment unit, is used for adjusting the duration of these a plurality of sub-frame drive data.
16. pixel driving device as claimed in claim 10, wherein this adjustment unit is used for the gray-scale value according to this second frame driving data, and the gray-scale value of the most preceding sub-frame drive data of these a plurality of sub-frame drive data is set at gray-scale value less than this second frame driving data.
17. pixel driving device as claimed in claim 16, wherein this adjustment unit also is used for setting the gray-scale value of sub-frame drive data in these a plurality of sub-frame drive data, makes the average gray value of the gray-scale value of the gray-scale value of these sub-frame drive data and these the most preceding sub-frame drive data level off to the gray-scale value of this second frame driving data.
18. pixel driving device as claimed in claim 10, wherein this adjustment unit is used for the gray-scale value according to this second frame driving data, and the gray-scale value of the most preceding sub-frame drive data of these a plurality of sub-frame drive data is set at gray-scale value greater than this second frame driving data.
19. a pixel driving device that is used for a LCD includes:
One receiving end is used for receiving the video data corresponding to a pixel of this LCD;
One first memory buffer is coupled to this receiving end, is used for storing one first frame driving data in this video data;
One logical block is coupled to this receiving end and this first memory buffer, is used for producing one first sub-frame drive data and one second sub-frame drive data according to the gray value differences distance between one second frame driving data in this first frame driving data and this video data;
One second memory buffer is coupled to this logical block, is used for storing this second sub-frame drive data; And
One output unit is coupled to this logical block and this second memory buffer, is used for showing these first sub-frame drive data and this second sub-frame drive data in regular turn by this pixel.
20. pixel driving device as claimed in claim 19, wherein this first frame driving data and this second frame driving data are corresponding to adjacent two frames.
21. pixel driving device as claimed in claim 19, the wherein sequential of leading this second frame driving data of the sequential of this first frame driving data.
22. pixel driving device as claimed in claim 19, wherein the size of this second memory buffer is half of memory size of this first memory buffer.
23. pixel driving device as claimed in claim 19, wherein this logical block produces these first sub-frame drive data and this second sub-frame drive data with lookup table mode or mathematical operation mode.
24. pixel driving device as claimed in claim 19, wherein the gray-scale value of the average gray value of these first sub-frame drive data and these second sub-frame drive data and this second frame driving data is close.
25. pixel driving device as claimed in claim 19, wherein the gray-scale value of these first sub-frame drive data is less than the gray-scale value of these second sub-frame drive data.
26. pixel driving device as claimed in claim 19, wherein this logical block also comprises a time adjustment unit, is used for adjusting the duration of these first sub-frame drive data and these second sub-frame drive data.
27. pixel driving device as claimed in claim 19, it also comprises a memory buffer control module, is coupled to this first memory buffer and this second memory buffer, is used for controlling this first memory buffer and this second memory buffer.
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| CN 200610162536 CN101192386A (en) | 2006-11-27 | 2006-11-27 | Method for driving LCD device and its related device |
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| CN 200610162536 CN101192386A (en) | 2006-11-27 | 2006-11-27 | Method for driving LCD device and its related device |
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