TWI401657B - Liquid crystal display and driving method thereof - Google Patents

Description

Liquid crystal display and driving method thereof

The present invention relates to a liquid crystal display and a method of driving the same.

Due to its light weight, small size and low power consumption, liquid crystal displays are widely used in modern information equipment such as televisions, notebooks, computers, mobile phones, and personal digital assistants. The conventional liquid crystal display adopts a driving mode of a cold type. However, when it is used for dynamic display, dynamic image sticking phenomenon is easily generated, which affects the display quality.

After analysis, there are two main reasons for the dynamic image sticking of the traditional liquid crystal display: the response speed of a series of liquid crystal molecules is slow, so that it can not be reversed to the target gray level within a specified time; the second line of human eyes has a picture brightness for a certain period of time. The average optical response of the integral. At present, the industry usually improves the dynamic afterimage caused by the slow response speed of liquid crystal molecules by using overdrive technology; and the dynamic afterimage caused by the integral of the brightness of the screen of the human eye for a certain period of time is inserted by means of interpolation. Black Frame Insertion Technology is being improved.

The black insertion technique causes the first subframe to display a normal picture by doubling the frame frequency and simultaneously dividing one frame into a first sub-frame and a second sub-frame with equal time. The second sub-frame displays a black picture. Since the second sub-frame displays a black screen, it does not cause visual residual. Therefore, the liquid crystal display using the black insertion technology has its dynamic afterimage appearing only in one sub-frame, that is, the afterimage time is reduced to approximately half of the original, so It can improve the dynamic image sticking phenomenon of traditional liquid crystal displays.

The following examples illustrate the principle of inserting black technology to improve the dynamic image sticking phenomenon of traditional liquid crystal displays. For the sake of analysis, we divide each frame into eight time periods 1, 2, 3, 4, 5, 6, 7, and 8. According to the principle of the optical response of the human eye to the integral average of the brightness of the picture in a certain period of time, the optical reaction actually seen by the human eye in a certain period of time is input to the average value of the gray level in the eight time periods after the start of the period. The input grayscales will be added to the eight time periods after the start of the time period and then divided by 8. Assuming that the liquid crystal display (taking one of the pixel units as an example) transitions from one still picture to another (ie, when dynamic display is performed), the target gray levels of the first frame to the fourth frame are 84, 128, respectively. , 128, 128.

Please refer to FIG. 1 , which is a graph showing the relationship between the gray scale of the conventional liquid crystal display and the optical response actually seen by the human eye as a function of time. For a conventional liquid crystal display, the input gray level of the eight time periods of each frame is the target gray level of the current frame, and the input gray scales of the first 32 frames of the first frame to the fourth frame are sequentially 84, 84. , 84, 84, 84, 84, 84, 84; 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128 , 128, 128, 128, 128, 128. Therefore, the curve of the conventional liquid crystal display whose input gray scale changes with time will be as shown by the curve L1 in FIG. According to the calculation principle that the optical reaction actually seen by the human eye in a certain period of time is input to the average value of the gray scales in the eight time periods after the start of the period, the human eye is in the first frame 1-8 period. The optical reaction seen (ie, the gray scale actually seen) is 84×8/8, (84×7+128×1)/8, (84×6+128×2)/8, (84× 5+128×3)/8, (84×4+128×4)/8, (84×3+128×5)/8, (84×2+ 128×6)/8, (84×1+128×7)/8; also according to the above calculation principle, the optical reaction seen by the human eye in the other 24 periods of the second frame to the fourth frame can also be obtained. 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128, 128, 128, 128, 128, 128, ie The curve of the optical response actually seen by the human eye in time in the conventional liquid crystal display is shown by the curve L2 in FIG. The afterimage time T1 of the conventional liquid crystal display in the first frame to the fourth frame is a period in which the optical reaction seen by the human eye changes, and is substantially eight periods.

Please refer to FIG. 2 , which is a graph showing the relationship between the gray scale of the liquid crystal display with black insertion technology and the optical response actually seen by the human eye as a function of time. For a liquid crystal display using black insertion technology, the gray level of the first four periods of each frame is the target gray level of the frame, and the gray level is 0 gray scale for the last four periods of each frame. The input gray scales of the first 32 frames of the first frame to the fourth frame are sequentially 84, 84, 84, 84, 0, 0, 0, 0; 128, 128, 128, 128, 0, 0, 0. 0, 128, 128, 128, 128, 0, 0, 0, 0; 128, 128, 128, 128, 0, 0, 0, 0. Therefore, the curve of the input gray scale of the liquid crystal display with black insertion technology will be as shown by the curve L3 in FIG. According to the calculation principle that the optical reaction actually seen by the human eye in a certain period of time is the average value of the input gray scales in the eight time periods after the start of the period, the human eye can obtain 32 in the first frame to the fourth frame. The optical reaction seen in the time period (ie, the gray scale actually seen) is 84×4/8, (84×3+128×1)/8, (84×2+128×1)/8, (84×1+128×3)/8, 128 (128×4/8), 64, 64, 64; 64, 64, 64, 64, 64, 64, 64, 64; 64, 64, 64, 64, 64, 64, 64, 64; 64, 64, 64, 64, 64, 64, 64, 64. That is, the curve of the optical response actually seen by the human eye in the liquid crystal display using the black insertion technique as a function of time is as shown by the curve L4 in FIG. The afterimage time T2 of the liquid crystal display using the black insertion technique in the first frame to the fourth frame is a period in which the optical reaction seen by the human eye changes, and is substantially four periods.

By comparing the afterimage time T1 of the conventional liquid crystal display in FIG. 1 with the afterimage time T2 of the liquid crystal display using the black insertion technique in FIG. 2, the residual image time of the liquid crystal display using the black insertion technique is roughly the residual of the conventional liquid crystal display. One and a half times of the shadow time, therefore, the liquid crystal display with black insertion technology improves the dynamic image sticking phenomenon of the conventional liquid crystal display. However, as can be seen from comparing FIG. 1 and FIG. 2, the liquid crystal display using the black insertion technique displays a black screen due to the latter half frame time in one frame time, and the brightness of the conventional liquid crystal display which displays a normal picture compared to one frame time. The reduction is only one-half of the conventional liquid crystal display, which results in a decrease in the overall brightness and contrast of the liquid crystal display using the black insertion technique, and the display quality is lowered.

In view of this, it is necessary to provide a liquid crystal display that effectively improves dynamic image sticking and has high overall brightness and contrast.

At the same time, it is also necessary to provide a driving method for a liquid crystal display which effectively improves dynamic image sticking and has high overall brightness and contrast.

A liquid crystal display comprising an interpolation processor and a data driving circuit, wherein the interpolation processor is configured to receive image data of each frame, and generate the current frame according to the image data of the current frame and the image data of the next frame The first sub-frame interpolation data and the second sub-frame interpolation data, and output the first sub-frame interpolation data and the second sub-frame interpolation data of the current frame to the data driving circuit, where the current frame and the subsequent frame The gray scales of the image data are a and b respectively, and the number of bits of the image data is K, and when 0≦2a-b≦2 ^k -1, the first sub-frame interpolation data of the current frame and the second sub-frame The gray levels of the frame interpolation data are b and 2a-b, respectively.

A liquid crystal display includes a data driving circuit and a liquid crystal display panel. When the liquid crystal display panel is scanned, the data driving circuit sequentially outputs a first sub-frame gray scale voltage and a second sub-frame gray scale voltage of the current frame to the a liquid crystal display panel, wherein the target gray levels of the current frame and the subsequent frame are a and b, respectively, and the number of bits of the image data of the liquid crystal display is K, and when 0≦2a-b≦2 ^k -1, the The gray levels of the first subframe and the second subframe of the current frame are b and 2a-b, respectively.

A driving method of a liquid crystal display, the liquid crystal display comprising a liquid crystal display panel, wherein the number of bits of the image data of the liquid crystal display is K, the driving method comprises the following steps: a. providing image data of a current frame of gray scale a And the grayscale is the image data of one frame after b; b. when 0≦2a-b≦2 ^k -1, the current frame of the grayscale is b according to the image data of the current frame and the subsequent frame a sub-frame interpolation data and a second sub-frame interpolation data of gray scale 2a-b; and c. generating a complex gray scale voltage according to the first sub-frame interpolation data and the second sub-frame interpolation data, and being When scanning, the complex gray scale voltage is applied to the liquid crystal display panel.

A driving method of a liquid crystal display, wherein the number of bits of the image data of the liquid crystal display is K, and the target gray levels of the current frame and the subsequent frame of the liquid crystal display are a and b, respectively, wherein 0≦2a-b≦2 ^{When k} -1, the gray levels of the first sub-frame and the second sub-frame of the current frame of the liquid crystal display are b and 2a-b, respectively.

Compared with the prior art, in the liquid crystal display and the driving method thereof, when the target gray levels of the current frame and the subsequent frame are a and b, respectively, and 0≦2a-b≦2 ^k -1, the current display of the liquid crystal display The gray levels of the first sub-frame and the second sub-frame of the frame are respectively b and 2a-b, and the current frame average gray level (b+(2a-b))/2 is greater than a/2, which is compared with the prior art. The black insertion technique results in a liquid crystal display having an average gray scale of a/2, and the gray scale is higher, that is, the brightness and contrast of the liquid crystal display are higher. In addition, according to the principle of the optical reaction of the human eye to the integral average of the brightness of the screen in a certain period of time, the liquid crystal display of the present invention and the liquid crystal display using the black insertion technique have substantially the same afterimage time, and therefore, the liquid crystal display of the present invention The driving method improves the brightness and contrast of the liquid crystal display while solving the dynamic image sticking problem, and the display quality of the liquid crystal display is high.

Please refer to FIG. 3, which is a circuit diagram of a preferred embodiment of the liquid crystal display of the present invention. The liquid crystal display 1 includes a liquid crystal display panel 10, a scan driving circuit 20, a data driving circuit 30, and an interpolation processor 40.

The liquid crystal display panel 10 includes a plurality of scanning lines 11 arranged in parallel, a plurality of data lines 13 parallel to each other and perpendicular to the scanning lines 11, and a plurality of pixel units defined by the scanning lines 11 and the data lines 13 and arranged in a matrix. 15. Each pixel unit 15 includes a thin film transistor 151, a pixel electrode 153, and a common electrode 155 disposed opposite the pixel electrode 153. And a liquid crystal layer (not shown) disposed between the pixel electrode 153 and the common electrode 155. The gate, the source and the drain of the thin film transistor 151 are respectively connected to the corresponding scan line 11, the data line 13, and the pixel electrode 153. The pixel electrode 153, the liquid crystal layer and the common electrode 155 form a liquid crystal capacitor 157. The plurality of scanning lines 11 are connected to the scan driving circuit 20, respectively. The plurality of data lines 13 are connected to the data driving circuit 30, respectively.

The interpolation processor 40 is configured to sequentially receive image data of each frame, and generate a first subframe interpolation data of the current frame and a second subframe interpolation data according to the current frame and the image data of the next frame. And outputting the first subframe interpolation data and the second subframe interpolation data to the data driving circuit 30, the interpolation processor 40 includes a lookup table. The lookup table includes a first subframe interpolation data of the current frame corresponding to the current frame and the image data of the next frame, and a second subframe interpolation data. In general, the number of gray levels that a liquid crystal display can display is determined by the number of bits of image data transmitted by the liquid crystal display. If the number of bits of the image data is K, where K is a natural number, the liquid crystal display includes 0 to 2 ^k -1 has a total of 2 ^k gray levels. The liquid crystal display 1 of the present invention is exemplified by image data having a number of bits of 8, so that the liquid crystal display 1 includes a total of 256 gray scales from 0 to 255.

The scan driving circuit 20 is configured to sequentially apply a scan signal to the scan line 11. The data driving circuit 30 is configured to generate a complex gray scale voltage according to the first subframe interpolation data and the second subframe interpolation data, and apply the complex gray scale voltage to the data line 13 when the scan line 11 is scanned.

Taking the nth frame as an example, the working principle of the liquid crystal display is as follows:

The interpolation processor 40 receives image data of the nth frame and the n+1th frame, and reads the first subframe interpolation data of the nth frame and the first in the lookup table. The two sub-frames interpolate the data, and output the first sub-frame interpolation data and the second sub-frame interpolation data to the data driving circuit 30.

Referring to Table 1 below, the interpolation processor 40 generates a schematic diagram of the first subframe interpolation data and the second subframe interpolation data. Specifically, if the liquid crystal display 1 (in the case of one of the pixel units 15 as an example), the grayscales of the image data of the nth frame and the n+1th frame are respectively a and b, wherein a and b are natural. The number or 0, when 0≦2a-b≦255, the gray scale of the first sub-frame interpolation data and the second sub-frame interpolation data read by the interpolation processor 40 from the look-up table are respectively b, 2a-b To ensure that the average gray level (b+(2a-b))/2 of the first sub-frame and the second sub-frame interpolation data of the nth frame is equal to the gray level a of the n-frame image data; when 2a-b< When 0 or 2a-b>255, the interpolation processor 40 performs gray insertion processing on the image data of the nth frame, so the first subframe and the second subframe interpolation data read from the lookup table 40 are read. The gray levels are a, x (x>0), respectively, to ensure that the average gray level (a+x)/2 of the first subframe and the second subframe interpolation data of the nth frame is greater than a/2.

The data driving circuit 30 generates a plurality of first subframe grayscale voltages and a plurality of second subframe grayscale voltages of the nth frame according to the first subframe interpolation data of the nth frame and the second subframe interpolation data.

Please refer to FIG. 4 together for the signal waveform diagram of the liquid crystal display 1. The nth frame time is divided into an equal first subframe time t1 and a second subframe time t2. During the first sub-frame time t1, the scan driving circuit 20 sequentially applies a scan signal to each column of scan lines 11. During the period of the scan pulse signal, a row of thin film transistors 151 connected to the scan line 11 is turned on. At the same time, the data driving circuit 30 applies the complex first sub-frame gray scale voltage to the source of the corresponding thin film transistor 151 by the data line 13 and transmits the pixel to the pixel through the drain of the thin film transistor 151. The electrode 153 is such that the liquid crystal capacitor 157 of the column is in a charging state, and the liquid crystal capacitor 157 maintains the first sub-frame gray scale voltage during the first sub-frame time t1 after the charging is completed.

After the scan pulse signal is applied to the last scan line 11, the second sub-frame time t2 is entered. In the second sub-frame time t2, the scan driving circuit 20 continuously generates a plurality of scan pulse signals and sequentially applies to each of the scan lines 11. During the operation of the scan pulse signal, a row of thin film transistors 151 connected to the scan line 11 is turned on. At the same time, the data driving circuit 30 applies the second sub-frame gray scale voltage to the source of the corresponding thin film transistor 151 by the data line 13 and transmits the pixel to the pixel through the drain of the thin film transistor 151. The electrode 153 is such that the liquid crystal capacitor 157 of the column is in a charging state, and the liquid crystal capacitor 157 maintains the second sub-frame gray scale voltage in the second sub-frame time r2 after the charging is completed. When the scan pulse signal is applied to the most After the subsequent scan line 11, the liquid crystal display 1 completes the display of the nth frame picture.

In the following, according to the working principle of the liquid crystal display 1, the principle that the liquid crystal display 1 of the present invention improves the dynamic image sticking phenomenon and maintains a high overall brightness and contrast is exemplified. Please refer to FIG. 5 together, which is a schematic diagram of the curve of the input gray scale of the liquid crystal display with time and the optical response actually seen by the human eye as a function of time.

Assuming that the liquid crystal display 1 (still taking one of the pixel units 15 as an example) transitions from one still picture to another (ie, when dynamic display is performed), the target gray levels of the first frame to the fourth frame are respectively 84, 128, 128, 128, the gray scales of the first and second sub-frame interpolation data of the first frame to the fourth frame outputted by the interpolation processor 40 are respectively 128, (84×2-128), 128 (128×2-128), (128×2-128), (128×2-128), that is, the input gray scales of the first to fourth frames of the pixel unit are sequentially 128, 40, 128, 128, 128, 128, 128, 128.

We also divide each frame into eight time periods 1, 2, 3, 4, 5, 6, 7, and 8, and the gray level of the total 32 periods of the first frame to the fourth frame of the pixel unit is input. Sequentially 128, 128, 128, 128, 40, 40, 40, 40; 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128, 128, 128, 128, 128, 128 ; 128, 128, 128, 128, 128, 128, 128, 128. Therefore, the liquid crystal display whose input gray scale changes with time will be as shown by the curve L5 in FIG. According to the calculation principle that the optical reaction actually seen by the human eye in a certain period of time is input to the average value of the gray scales in the eight time periods after the start of the period, the human eye is in the first frame 1-8. The optical reaction seen in the time period (ie, the gray scale actually seen) is (128×4+40×4)/8, (128×4+40×4)/8, (128×4+40). ×4)/8, (128×4+40×4)/8, (40×3+128×5)/8, (40×2+128×6)/8, (40×1+128×7) /8, (128 × 8) / 8; also according to the above calculation principle, it can also be seen that the optical response seen by the human eye in the other 24 periods of the second frame to the fourth frame is 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128, 128, 128, 128, 128, 128; 128, 128, 128, 128, 128, 128, 128, 128, that is, the human eye in the liquid crystal display The curve of the optical response actually seen over time is shown by curve L6 in FIG. The afterimage time T3 of the liquid crystal display in the first frame to the fourth frame is a period in which the optical reaction seen by the human eye changes, and is substantially four periods. Meanwhile, the comparison curve L6 and the curve L1 in FIG. 1 find that the average gray scale of the curve L6 is equal to the average gray scale of the curve L2 in FIG. 1 and larger than the average gray scale of the curve L4 in FIG. 2, that is, the liquid crystal The brightness of the display 1 is equal to that of a conventional liquid crystal display, and is greater than the brightness of a liquid crystal display using a black insertion technique.

Compared with the prior art, the liquid crystal display 1 of the present invention and the driving method thereof generate a first sub-frame interpolation data of the n-th frame and the image data by the interpolation processor 40 according to the image data of the nth frame and the n+1th frame. The second sub-frame interpolates the data, and the average gray level (b+(2a-b))/2 of the first sub-frame and the second sub-frame interpolated data of the n-th frame is equal to the gray level a of the n-frame image data or Compared with the prior art, the liquid crystal display having an average gray scale of a/2 is black in comparison with the prior art, and the gray scale is higher, that is, the brightness and contrast of the liquid crystal display are higher. In addition, the liquid crystal display 1 of the present invention and the liquid crystal using the black insertion technique The residual time of the display is approximately equal. Therefore, the liquid crystal display and the driving method thereof of the present invention improve the brightness and contrast of the liquid crystal display while solving the problem of dynamic image sticking, and the display quality of the liquid crystal display 1 is high.

The liquid crystal display 1 of the present invention can also be modified in various other ways. For example, when 2a-b<0 or 2a-b>255, the interpolation processor 40 performs black insertion processing on the image data of the nth frame, that is, When the first sub-frame and the second sub-frame interpolated data have gray levels of a and 0 respectively, since 0≦2a-b≦255, the average gray level of the interpolated data of the first sub-frame and the second sub-frame (b+( 2a-b))/2 is equal to the gray level a of the n-frame image data, and the brightness of the liquid crystal display 1 is higher than that of the liquid crystal display using the black insertion technique. Therefore, the change design improves the dynamic image sticking as a whole. The phenomenon also increases the brightness and contrast of the picture; in addition, when 2a-b<0 or 2a-b>255, the interpolation processor 40 can also perform dynamic gray insertion processing on the image data of the nth frame, that is, The gray scales of the first sub-frame and the second sub-frame interpolation data are a+x and ax(x≧0), respectively, and the principle of the above-mentioned change design can improve the dynamic image sticking phenomenon and improve the picture as a whole. Brightness and contrast.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. All should be covered by the following patent application.

1‧‧‧LCD display

10‧‧‧LCD panel

20‧‧‧Scan drive circuit

30‧‧‧Data Drive Circuit

40‧‧‧Interpolation processor

11‧‧‧ scan line

13‧‧‧Information line

15‧‧‧ pixel unit

151‧‧‧film transistor

151‧‧‧ pixel electrodes

153‧‧‧Common electrode

157‧‧‧Liquid Crystal Capacitor

FIG. 1 is a graph showing the relationship between the gray scale of the conventional liquid crystal display and the optical response actually observed by the human eye as a function of time.

Fig. 2 is a graph showing the relationship between the gray scale of the liquid crystal display with the black insertion technique and the optical response actually observed by the human eye as a function of time.

3 is a schematic circuit diagram of a preferred embodiment of the liquid crystal display of the present invention.

4 is a signal waveform diagram of the liquid crystal display shown in FIG.

FIG. 5 is a graph showing the relationship between the gray scale of the liquid crystal display shown in FIG. 3 and the optical response actually seen by the human eye as a function of time.

Claims (26)

A liquid crystal display comprising an interpolation processor and a data driving circuit, wherein the interpolation processor is configured to receive image data of each frame, and generate the current frame according to the image data of the current frame and the image data of the next frame The first sub-frame interpolation data and the second sub-frame interpolation data, and output the first sub-frame interpolation data and the second sub-frame interpolation data of the current frame to the data driving circuit, where the current frame and the subsequent frame The gray scales of the image data are a and b respectively, and the number of bits of the image data is K, and when 0≦2a-b≦2 ^k -1, the first sub-frame interpolation data of the current frame and the second sub-frame The gray levels of the frame interpolation data are b and 2a-b, respectively, where K is a natural number and a and b are natural numbers or 0. The liquid crystal display according to claim 1, wherein when the 2a-b<0 or 2a-b>2 ^k -1, the first sub-frame interpolation data of the current frame and the second sub-frame interpolation data The gray levels are a, x, x ≧ 0. The liquid crystal display according to claim 1, wherein when the 2a-b<0 or 2a-b>2 ^k -1, the first sub-frame interpolation data of the current frame and the second sub-frame interpolation data The gray levels are a+x, ax, x≧0. The liquid crystal display according to claim 1, wherein the image data has a bit number K of 8. The liquid crystal display according to claim 1, wherein the interpolation processor comprises a lookup table, wherein the lookup table includes one of the current frame corresponding to the image frame of the current frame and the next frame. Data and a second sub-frame interpolation data. The liquid crystal display of claim 1, further comprising a liquid crystal display panel, wherein the data driving circuit generates a plurality of first sub-frame gray scale voltages according to the first sub-frame interpolation data and the second sub-frame interpolation data a second sub-frame gray scale voltage, and sequentially applying the plurality of first sub-frame gray scale voltages and second sub-frame gray scale voltages to the liquid crystal display panel when the liquid crystal display panel is scanned. The liquid crystal display of claim 6, further comprising a scan driving circuit for scanning the liquid crystal display panel. The liquid crystal display device of claim 7, wherein the liquid crystal display panel comprises a plurality of scan lines, a plurality of data lines, and a plurality of pixel units defined by the scan lines and the data lines, wherein the plurality of scan lines are respectively connected. To the scan driving circuit; the plurality of data lines are respectively connected to the data driving circuit. The liquid crystal display of claim 8, wherein each pixel unit comprises a thin film transistor, a pixel electrode, a common electrode, and a liquid crystal layer disposed between the pixel electrode and the common electrode. The gate, the source and the drain of the thin film transistor are respectively connected to their corresponding scan lines, data lines and pixel electrodes, and the pixel electrodes, the liquid crystal layer and the common electrode form a liquid crystal capacitor. A liquid crystal display includes a data driving circuit and a liquid crystal display panel. When the liquid crystal display panel is scanned, the data driving circuit sequentially outputs a first sub-frame gray scale voltage and a second sub-frame gray scale voltage of the current frame to the a liquid crystal display panel, wherein the target gray levels of the current frame and the subsequent frame are a and b, respectively, and the number of bits of the image data of the liquid crystal display is K, and when 0≦2a-b≦2 ^k -1, the The gray levels of the first sub-frame and the second sub-frame of the current frame are b and 2a-b, respectively, where K is a natural number, and a and b are natural numbers or 0. The liquid crystal display according to claim 10, wherein when 2a-b<0 or 2a-b>2 ^k -1, the gray levels of the first sub-frame and the second sub-frame of the current frame are respectively a, x, x ≧ 0. The liquid crystal display according to claim 10, wherein when 2a-b<0 or 2a-b>2 ^k -1, the gray levels of the first sub-frame and the second sub-frame of the current frame are respectively a+x, ax, x≧0. The liquid crystal display of claim 10, wherein the image data has a bit number K of 8. The liquid crystal display of claim 10, further comprising an interpolation processor, wherein the data driving circuit generates the first sub-frame interpolation data and the second sub-frame interpolation data of the current frame output by the interpolation processor. The first subframe grayscale voltage of the current frame and the second subframe grayscale voltage. The liquid crystal display according to claim 14, wherein the interpolation processor includes a lookup table including a first sub-frame interpolation data of a current frame corresponding to the image data of the current frame and the next frame, and A second sub-frame interpolation data. The liquid crystal display of claim 10, further comprising a scan driving circuit for scanning the liquid crystal display panel. The liquid crystal display device of claim 16, wherein the liquid crystal display panel comprises a plurality of scan lines, a plurality of data lines, and a plurality of pixel units defined by the scan lines and the data lines, the plurality of scan lines being respectively connected To the scan driving circuit; the plurality of data lines are respectively connected to the data driving circuit. The liquid crystal display of claim 17, wherein each pixel unit comprises a thin film transistor, a pixel electrode, a common electrode, and a liquid crystal layer disposed between the pixel electrode and the common electrode. The gate, the source and the drain of the thin film transistor are respectively connected to their corresponding scan lines, data lines and pixel electrodes, and the pixel electrodes, the liquid crystal layer and the common electrode form a liquid crystal capacitor. A driving method of a liquid crystal display, the liquid crystal display comprising a liquid crystal display panel, wherein the number of bits of the image data of the liquid crystal display is K, the driving method comprises the following steps: a. providing image data of a current frame of gray scale a And the grayscale is the image data of one frame after b; b. when 0≦2a-b≦2 ^k -1, the current frame of the grayscale is b according to the image data of the current frame and the subsequent frame a sub-frame interpolation data and a second sub-frame interpolation data of gray scale 2a-b; and c. generating a complex gray scale voltage according to the first sub-frame interpolation data and the second sub-frame interpolation data, and being During scanning, the complex gray scale voltage is applied to the liquid crystal display panel, wherein K is a natural number, and a and b are natural numbers or 0. The driving method of the liquid crystal display according to claim 19, wherein, in the step b, when 2a-b<0 or 2a-b>2 ^k -1, according to the current frame and the next frame The image data is generated by interpolating data of a first sub-frame of a current frame of gray scale a and interpolated data of a second sub-frame of gray scale x, where x ≧ 0. The driving method of the liquid crystal display according to claim 19, wherein, in the step b, when 2a-b<0 or 2a-b>2 ^k -1, according to the current frame and the next frame The image data is generated by interpolating the first sub-frame of the current frame with gray scale a+x and the second sub-frame interpolation data of gray scale ax, where x≧0. The method of driving a liquid crystal display according to claim 19, wherein the number of bits of the image data of the liquid crystal display is 8. A driving method of a liquid crystal display, wherein the target gray scales of the current frame and the subsequent frame of the liquid crystal display are a and b, respectively, and the number of bits of the image data of the liquid crystal display is K, wherein, when 0≦2a-b≦ When 2 ^k -1, the gray levels of the first sub-frame and the second sub-frame of the current frame of the liquid crystal display are b and 2a-b, respectively, where K is a natural number, and a and b are natural numbers or 0. The driving method of the liquid crystal display according to claim 23, wherein, in the step b, when 2a-b<0 or 2a-b>2 ^k -1, the first subframe of the current frame and the first The gray levels of the two sub-frames are a and x, respectively, where x ≧ 0. The driving method of the liquid crystal display according to claim 23, wherein, in the step b, when 2a-b<0 or 2a-b>2 ^k -1, the first subframe of the current frame and the first The gray levels of the two sub-frames are a+x and ax, respectively, where x≧0. The driving method of the liquid crystal display according to claim 23, wherein the number of bits of the image data of the liquid crystal display is 8.