KR20110044423A - Method and circuit detecting motion, and liquid crystal disaply using the same - Google Patents

Abstract

PURPOSE: A method and a circuit for detecting the speed of motion and a liquid crystal display device using the same are provided to accurately determine the speed of motion in a moving picture by filtering the variation of brightness according to noises and image characteristics. CONSTITUTION: A brightness difference detection unit(4) detects brightness difference information of the current frame using the difference between brightness data of the previous frame and the current frame. A cluster determination unit(6) decides the clustered state of pixels with brightness differences using the brightness difference information detected by the brightness difference detection unit. A brightness difference detection unit(8) detects the brightness differences from the block determined as being clustered. An edge detection unit(10) detects edge components by filtering the brightness data of the current frame. A motion level detection unit(12) detects motion levels according to the brightness differences and the edge components.

Description

METHOD AND CIRCUIT DETECTING MOTION, AND LIQUID CRYSTAL DISAPLY USING THE SAME

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a motion detection method and circuit capable of accurately detecting a moving speed of an image, and a liquid crystal display using the same.

The liquid crystal display displays an image through a pixel matrix using electrical and optical characteristics of the liquid crystal having anisotropy such as refractive index and dielectric constant. Each pixel of the liquid crystal display implements grayscale by adjusting the light transmittance that passes through the polarizing plate in a variable direction of the liquid crystal array according to the data signal. The liquid crystal display device includes a liquid crystal panel for displaying an image through a pixel matrix, a driving circuit for driving the liquid crystal panel, and a backlight unit for irradiating light to the liquid crystal panel.

The liquid crystal display is an active matrix type in which a thin film transistor as a switching element is formed in each pixel, and thus is suitable for displaying a moving image. However, due to the inherent viscosity and elasticity of liquid crystals, and motion blur due to the afterimage of the previous frame during motion picture play due to the characteristics of hold type driving, motion blur There is a problem that the phenomenon occurs. In order to solve this problem, an overdriving method for improving the liquid crystal response speed in proportion to the applied voltage by applying a voltage larger than a target value according to the data difference between adjacent frames is used.

The conventional overdriving method has a limitation in solving the motion blur by applying the overshoot component according to the data difference. To solve this problem, the overshoot value is applied differently according to the moving speed of the video as disclosed in Korean Patent Application No. 10-2006-0025407 of the applicant, or as disclosed in Korean Patent Application No. 10-2007-0018767. A method of applying sharpness gain that emphasizes the contour according to the moving speed of the video is proposed.

Accordingly, in order to effectively suppress motion blur of a moving picture, it is required to accurately determine the moving speed of the moving picture, but conventionally, the moving speed is determined only by the amount of change in luminance between adjacent frames. For this reason, it is difficult to accurately detect the movement speed according to the luminance change amount because the luminance change due to noise is not reflected and reflected in the luminance change amount. In addition, when the movement speed is determined only by the amount of change in luminance, an image having a large number of edges has a large amount of change in luminance compared to an image with few edges, and thus it is difficult to accurately detect the movement speed according to the characteristics of the image. Accordingly, there is a conventional problem that the image is distorted or the luminance is lost because the data is modulated or the brightness of the backlight is adjusted by the detection of an incorrect movement speed.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a motion detection method and circuit capable of accurately determining a moving speed of a video by filtering a change in luminance according to noise or image characteristics, and a liquid crystal display using the same.

In order to solve the above problems, a motion detection method according to an embodiment of the present invention comprises the steps of detecting the luminance difference information of the current frame using the luminance difference between the luminance data of the previous frame and the luminance data of the current frame; Detecting a change in luminance by identifying a cluster state of pixels having a change in luminance by using the detected luminance difference information; Filtering edge data of the current frame to detect edge components; Detecting a motion level according to the detected luminance change amount and an edge component.

The detecting of the amount of change of luminance may include extracting the detected difference of luminance information in units of blocks to determine whether the pixels having the change of luminance are in a clustered state; And calculating the number of pixels having the luminance change in the block determined to be in the clustered state and outputting the luminance variation amount.

The detecting of the edge component may include calculating a number of edge pixels by filtering luminance data of the current frame.

The motion level is detected on a frame basis, and the motion detection method of the present invention further includes detecting an average motion level of a plurality of frames.

A motion detection circuit according to an embodiment of the present invention includes a luminance difference detector for detecting luminance difference information of a current frame by using a luminance difference between luminance data of a previous frame and luminance data of a current frame; A cluster determination unit that determines a cluster state of pixels having luminance variations by using the detected luminance difference information from the luminance difference detection unit; A luminance change detector detecting a luminance change in a block determined by the cluster determination unit as a cluster state; An edge detector for filtering edge data of the current frame to detect edge components; And a motion level detector for detecting a motion level in accordance with the luminance change amount from the luminance change amount detector and the edge component from the edge detector.

The luminance variation detector detects the number of pixels having the luminance variation in the block determined as the clustered state and outputs the luminance variation quantity. The edge detector filters the luminance data of the current frame, calculates the number of edge pixels, and outputs the number of edge pixels. The motion level detector detects the motion level in units of frames, and the motion detection circuit of the present invention further includes an average motion level detector that detects an average motion level of a plurality of frames by inputting the motion level.

The liquid crystal display according to an exemplary embodiment of the present invention detects a motion level according to a luminance variation and an edge component of input data, and adjusts sharpness gain, overshoot and undershoot of overdriving according to the detected motion level. An image processor which modulates input data; And a liquid crystal panel driver which displays data modulated by the image processor on the liquid crystal panel.

The image processor may include a color space converter configured to convert input data into luminance and color difference data; Detects the luminance change amount between the luminance data of the current frame and the luminance data of the previous frame, the edge component of the luminance data of the current frame from the color space converter, and detects the motion level according to the luminance change amount and the edge component. The motion detection circuit; A sharpness filter for sharply filtering and modulating luminance data of the current frame by using sharpness gain adjusted according to the motion level from the motion detection cycle; A color space inverse transformer for inversely converting the modulated luminance data from the sharpness filter and the color difference data from the color space converter into second data; And an overdriving circuit for modulating the second data from the color space inverse transform unit into third data using the overshoot and undershoot values adjusted according to the motion level from the motion detection cycle.

The liquid crystal display of the present invention includes a backlight including a plurality of lamps for irradiating light to the liquid crystal panel; An inverter driving the backlight; And a backlight controller for controlling the scanning of the backlight through the inverter by adjusting the size of the scanning duty and the scanning lamp block for scanning the plurality of lamps according to the motion level from the motion detection circuit.

The motion detection circuit and method according to the present invention can block the reflection of noise components in the amount of luminance change by detecting the amount of change in luminance by grasping the clustering state of pixels having the luminance change. In addition, by detecting the motion level using the edge component (the number of edge pixels) together with the luminance change amount (the number of moving pixels), the movement speed can be accurately detected according to the image characteristic.

In addition, the liquid crystal display using the motion detection circuit according to the present invention, the noise of the noise filter is filtered, reflecting the luminance variation and the edge component, the gain of the sharpness filter, the overshoot / undershoot value of the overdriving circuit according to the detected average motion level By varying the scanning duty and the size of the scanning block of the backlight controller, it is possible to improve the image quality of the video by minimizing luminance loss without image distortion.

1 is a block diagram illustrating a motion detection circuit according to an exemplary embodiment of the present invention, and FIG. 2 is a flowchart illustrating a motion detection method according to an exemplary embodiment of the present invention.

The motion detection circuit of the present invention shown in FIG. 1 includes a frame memory 2, a luminance difference detector 4, a cluster determination unit 6, a luminance variation detector 8, an edge detector 10, and a motion level detector 12. ), An average motion level detector 14 is provided.

The frame memory 2 stores the luminance data Ycur of the current frame input from the outside, and outputs the luminance data stored in the next frame as the luminance data Ypre of the previous frame to the luminance difference detector 4.

The luminance difference detection unit 4 is configured according to the luminance difference (| Ypre-Ycur |) between the luminance data Ypre of the previous frame input from the frame memory 2 and the luminance data Ycur of the current frame input from the outside. The luminance difference information is detected in pixel units and output to the cluster determination unit 6. (S2)

Specifically, the luminance difference detector 4 determines the luminance difference (| Ypre-Ycur |) between the luminance data Ypre of the previous frame from the frame memory 2 and the luminance data Ycur of the current frame from the outside. It calculates in pixel units and compares the calculated brightness difference (| Ypre-Ycur |) with the preset 1st threshold value T1 in pixel units. As a result of the comparison between the luminance difference (| Ypre-Ycur |) and the first threshold value T1, if the calculated luminance difference (| Ypre-Ycur |) is larger than the first threshold value (T1), the first pixel representing the first pixel with luminance change is obtained. Outputs the luminance difference information of one logical value (for example, "1"), and if the calculated luminance difference | Ypre-Ycur | is equal to or smaller than the first threshold value T1, the second pixel having no luminance change; Luminance difference information of a second logical value (eg, "0") indicating is output. The luminance difference detector 4 outputs the luminance difference information of each pixel according to the luminance difference (| Ypre-Ycur |) between the previous frame and the current frame to the cluster determination unit 6.

The cluster determination unit 6 extracts a block in which a first pixel (moving pixel) having a change in luminance is clustered using the luminance difference information from the luminance difference detection unit 4 to obtain luminance difference information from which noise components are filtered. The luminance change amount detecting unit 8 outputs the luminance change amount detection unit 8. (S6) The first pixel having a change in luminance according to the movement of the image (moving pixel) has a clustered characteristic, but has a change in luminance due to noise. Has the property of being dispersed.

Specifically, the cluster determination unit 6 extracts the luminance difference information from the luminance difference detection unit 4 in units of blocks of a predetermined size. For example, a block having a predetermined size may be 4 × 4 pixel size as shown in FIG. 3, and the size of the block may be variously changed. The group determining unit 6 calculates the number of the first pixels having the luminance change in the extracted block and compares the calculated number of the first pixels with a preset second threshold value T2 to determine whether the first pixels are clustered. To judge. As a result of the comparison, when the number of first pixels in the block is larger than the second threshold T2, the cluster determination signal of the first logical value representing the cluster block is output together with the corresponding block, and the number of first pixels is equal to the second threshold ( If less than T2), the cluster determination signal of the second logic value indicating the distributed block is output and the output of the block is blocked. Therefore, the cluster determination unit 6 outputs only the blocks in which the first pixels having the luminance change are clustered, and filters the noise components by blocking the blocks in which the second pixels are dispersed.

For example, if the number of the first pixels is larger than 8, which is 1/2 of the total 16 pixels of the 4x4 pixel block shown in FIG. If the number of the first pixels is 8 or less, a group determination signal of " 0 " representing a scattering block is output and the output of the block is cut off.

The luminance change detection unit 8 counts the number of the first pixels with the luminance change according to the group determination signal and detects the luminance change amount (the number of moving pixels) in units of frames. (S8) Specifically, the luminance change detection unit 8 When the cluster determination signal indicating the cluster block is input from the cluster determination unit 6, the counting unit 1 counts the number of the first pixels having the luminance change of the corresponding block input from the cluster determination unit 6, while the luminance variation detection unit ( 8), when the cluster determination signal indicating the distributed block is input from the cluster determination unit 6, the first pixel of the block is not counted, and thus the noise component may be prevented from being reflected in the luminance variation.

The edge detector 10 detects an edge using the luminance data Ycur of the current frame, calculates the number of pixels of the detected edge, and outputs the number of pixels of the detected edge to the motion level detector 10 (S10). The luminance data Ycur is filtered by a method such as first order differentiation to detect edge pixels, the number of detected edge pixels is calculated, and output to the motion level detector 12. For example, when edges are detected and displayed as white pixels in each of the images illustrated in FIGS. 4A and 4B, FIG. 4A is a relatively small number of edge pixels, and FIG. 4B is a relatively large number of edge pixels. It can be seen that.

The motion level detector 12 reflects the luminance change amount (the number of moving pixels) detected by the luminance change amount calculation unit 8 and the edge component (the number of edge pixels) detected by the edge detection unit 10. (S12) The motion level detector 12 compares the number of pixels moved from the luminance variation calculator 8 with the number of edge pixels from the edge detector 10. The motion level is detected in units of frames according to the comparison result. For example, as shown in Table 1 below, a motion level may be divided into five motion levels according to the number of pixels moved and the number of edge pixels. In Table 1 below, Mmp represents the number of pixels moved, Nep represents the number of edge pixels, and A, B, C, and D represent arbitrary constants set in advance.

Mmp = 0 Motion level 0 0 <Mmp <(A × Nep) Motion level 1 (A × Nep) <Mmp <(B × Nep) Motion level 2 (B × Nep) <Mmp <(C × Nep) Motion level 3 (C × Nep) <Mmp <(D × Nep) Motion level 4 (D × Nep) <Mmp Motion level 5

The motion level detector 12 compares the number of moved pixels and the number of edge pixels as shown in Table 1 to determine the motion level in units of frames, or the motion level is increased in correspondence with the number of motion pixels and the number of edge pixels. The distinction of lookup tables may be used to detect motion levels on a frame-by-frame basis. Accordingly, when judging the motion level only by the luminance change amount, the motion level is relatively high in the image with many edges, and the motion level is relatively low in the image with few edges. Speed) can be detected accurately.

The average motion level detector 14 sums the frame-level motion levels input from the motion level detector 12 for a plurality of frames, calculates and outputs average motion levels of the plurality of frames (S14).

As described above, the motion detection circuit and method according to the present invention can block the noise component from being reflected in the luminance change amount by extracting only the cluster block of the first pixel having the luminance change and detecting the luminance change amount. In addition, by detecting the motion level and the average motion level by using the edge component (the number of edge pixels) together with the luminance change amount (the number of moving pixels), it is possible to detect the correct motion level and the average motion level indicating the movement speed according to the image characteristics. Can be.

In addition, the average motion level detected by the above-described motion detection circuit of the present invention is applied to the sharpness filter, the overdriving circuit, and the backlight controller of the liquid crystal display, respectively. Accordingly, data distortion can be prevented by applying the optimum value of the sharpness gain and overdriving overshoot / undershoot according to the average motion level, and the size of the scanning duty and the scanning block according to the average motion level during backlight scanning. By varying the luminance loss can be minimized.

5 is a block diagram illustrating a liquid crystal display device to which a motion detection circuit according to an exemplary embodiment of the present invention is applied.

The liquid crystal display shown in FIG. 5 includes a liquid crystal panel 102 for displaying an image, a data driver 104 for driving a data line DL of the liquid crystal panel 102, and a gate line of the liquid crystal panel 102. GL) and the gate driver 106 for detecting the average motion level according to the luminance variation and the edge component from the input data, and the sharpness using the overshoot / undershoot value of the sharpness gain and overdriving adjusted according to the average motion level. The image processing unit 110 modulates and outputs data by filtering and overdriving driving, and outputs the data from the image processing unit 110 to the data driver 104, and supplies the data driver 104 and the gate driver 106. It includes a timing controller 108 for controlling.

In addition, the liquid crystal display may be configured according to an average motion level and dimming value from the backlight 116 for irradiating light to the liquid crystal panel 102, the inverter 114 for driving the backlight 116, and the image processor 110. A backlight controller 112 is further provided to control the backlight 116 through the 114.

The image processor 110 detects an average motion level of a plurality of frames according to the luminance variation and the edge component of the input image, performs sharpness filtering by adjusting the sharpness gain according to the average motion level, and performs overshoot / overshoot according to the average motion level. By adjusting the undershoot value and performing overdriving, the data is modulated and output to the timing controller 108, and the average motion level is output to the backlight controller 112. In addition, the image processor 110 may analyze the luminance of the input image, adjust the dimming value according to the luminance analysis result, and output the dimming value to the backlight controller 112. A detailed description of the image processor 110 will be described later.

The timing controller 112 aligns the output data of the image processor 110 and outputs the data to the data driver 104. In addition, the timing controller 112 controls the driving timing of the data driver 104 by using a plurality of synchronization signals from the image processor 110, that is, a dot clock, a data enable signal, a horizontal synchronization signal, and a vertical synchronization signal. A data control signal and a gate control signal for controlling the driving timing of the gate driver 106 are generated and output.

The data driver 104 converts the digital image data from the timing controller 108 into an analog data signal (pixel voltage signal) using a gamma voltage in response to the data control signal from the timing controller 108, thereby providing a liquid crystal panel 102. Is supplied to a plurality of data lines DL.

The gate driver 106 sequentially drives the plurality of gate lines GL of the liquid crystal panel 102 in response to the gate control signal of the timing controller 108.

The liquid crystal panel 102 displays an image through a pixel matrix in which a plurality of pixels are arranged. Each pixel realizes a desired color by using a combination of red, green, and blue sub-pixels that adjust light transmittance by varying liquid crystal arrays according to data signals. Each subpixel includes a thin film transistor TFT connected to a gate line GL and a data line DL, a liquid crystal capacitor Clc connected in parallel with the thin film transistor TFT, and a storage capacitor Cst. The liquid crystal capacitor Clc charges the data signal supplied to the pixel electrode through the thin film transistor TFT and the difference voltage between the common voltage Vcom supplied to the common electrode and drives the liquid crystal according to the charged voltage to thereby transmit light. Adjust. The storage capacitor Cst keeps the voltage charged in the liquid crystal capacitor Clc stable. The liquid crystal panel 102 may improve image quality by driving a liquid crystal by charging a voltage corresponding to data modulated such that motion blur is suppressed according to the speed of movement in the image processor 110 when displaying a moving image.

The backlight 116 includes a plurality of lamp blocks in a direct type, and the plurality of lamp blocks are driven to scan for suppressing motion blur. The backlight controller 112 varies the scanning duty and / or the size of the scanning block (the number of off lamps) according to the average motion level from the image processor 110 to perform scanning of the backlight 116 through the inverter 110. To control. Accordingly, the scanning duty of the backlight 116 and / or the size of the scanning block are adjusted to suit the moving speed of the image, thereby minimizing luminance loss. In addition, the backlight controller 112 controls the inverter 114 according to the dimming value from the image processor 110 to adjust the brightness of the backlight 116. The backlight controller 112 generates a pulse width modulation (PWM) signal corresponding to the dimming value and outputs the same to the inverter 114, and the inverter 114 generates a backlight 116 driving signal corresponding to the pulse width of the PWM signal. To drive the backlight 116.

FIG. 6 is a block diagram illustrating an internal configuration of the image processor 110 illustrated in FIG. 5.

The image processor 110 illustrated in FIG. 6 includes a color space converter 210, a delay unit 220, a motion detection circuit 230, a sharpness filter 240, a color space inverse converter 250, and an overdriving circuit ( 260). In addition, the image processor 110 may further include a luminance analyzer and a dimming adjuster.

The color space converter 210 converts color data RGB input from the outside into luminance and color difference data YUV. The color space converter 210 converts the RGB data into YUV data through an operation as shown in Equation 1 below.

Y = 0.229 × R + 0.587 × G + 0.114 × B

U = 0.493 × (B-Y)

V = 0.887 × (R-Y)

The color space converter 210 outputs the luminance data Y to the motion detection circuit 230, and outputs the color difference data UV to the color space inverse converter 250 through the delay unit 220.

The motion detection circuit 230 is the same as the configuration shown in FIG. The motion detection circuit 230 performs a luminance difference between the luminance data Ypre of the previous frame from the frame memory 2 shown in FIG. 1 and the luminance data Ycur of the current frame from the color space converter 210. Luminance difference information according to (| Ypre-Ycur |) is detected, and using only the detected luminance difference information, only a block in which a first pixel (moving pixel) having a change in luminance is clustered is extracted and noise components are not reflected. The amount of change in luminance (number of moving pixels) is detected. In addition, the motion detector 230 detects an edge component (the number of edge pixels) by using the luminance data (Ycur) of the current frame, and calculates a luminance change amount (the number of moving pixels) and an edge component (the number of edge pixels). The motion level, which reflects the speed of the movement, is detected in units of frames, and then the average motion level of the plurality of frames is detected. The motion detection circuit 230 outputs the detected average motion level to the sharpness filter 240, the overdriving circuit 260, and the backlight controller 112 illustrated in FIG. 5.

The sharpness filter 240 adjusts the sharpness gain according to the average motion level from the motion detection circuit 230, and modulates luminance data from the color space converter 210 by sharpness filtering using the adjusted sharpness gain, An undershoot is generated at the edge of the moving image, and the outline of the moving image becomes clear.

The color space inverse converter 250 inversely converts the modulated luminance data Y ′ from the sharpness filter 240 and the color difference data UV from the delay unit 220 into the color data RGB, thereby overwriting the circuit. 260). The color space inverse transform unit 250 inversely converts the modulated luminance data Y 'and the color difference data U and V into RGB data using an operation as shown in Equation 2 below.

R = MY + 0.000 × U + 1.140 × V

G = MY-0.396 × U-0.581 × V

B = MY + 2.029 × U + 0.000 × V

The overdriving circuit 260 compares the data of the current frame from the color space inverse converter 250 with the data of the previous frame stored in the internal frame memory (not shown) and overdrives the data of the current frame according to the comparison result. Modulate the data and output it. The overdriving circuit 260 uses the lookup table in which the overshoot / undershoot value for overdriving is stored in response to the data of the previous frame and the current frame, and the overshoot / undershoot value corresponding to the data of the previous frame and the current frame. Select and output or modulate the data of the current frame into overdriving data by adding the selected overshoot / undershoot value to the data of the current frame. In particular, the overdriving circuit 260 prevents data distortion due to overdriving by adjusting the overshoot / undershoot value for overdriving according to the average motion level from the motion detection circuit 230. In this case, the overdriving hero 260 may change the overshoot / undershoot value according to the average motion level by selecting one of a plurality of lookup tables having different overshoot / undershoot values according to the average motion level.

As described above, the liquid crystal display using the motion detection circuit according to the exemplary embodiment of the present invention overshoots the gain of the sharpness filter and the overdriving circuit according to the average motion level detected by filtering out noise components and reflecting luminance variation and edge components. By changing the / undershoot value, the scanning duty of the backlight control unit and the size of the scanning block, it is possible to improve the image quality of the video by minimizing the luminance loss without image distortion.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 is a block diagram illustrating a motion detection circuit according to an exemplary embodiment of the present invention.

2 is a block diagram showing a motion detection method according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a 4 × 4 pixel block extracted by the cluster determination unit shown in FIG. 1 as an example.

4A and 4B are diagrams illustrating white components by detecting edge components in an input image.

5 is a block diagram illustrating a liquid crystal display using a motion detection circuit according to an exemplary embodiment of the present invention.

FIG. 6 is a block diagram illustrating an internal configuration of an image processor shown in FIG. 5.

Claims (11)

Detecting luminance difference information of the current frame using the luminance difference between the luminance data of the previous frame and the luminance data of the current frame; Detecting a change in luminance by identifying a cluster state of pixels having a change in luminance by using the detected luminance difference information; Filtering edge data of the current frame to detect edge components; And detecting a motion level according to the detected luminance change amount and the edge component. The method according to claim 1, Detecting the amount of change in brightness Extracting the detected luminance difference information in units of blocks to determine whether the pixels having the luminance change are in a clustered state; And calculating the number of pixels having the luminance change in the block determined as the clustering state and outputting the number of pixels having the luminance change. The method according to claim 1, Detecting the edge component And calculating the number of edge pixels by filtering the luminance data of the current frame. The method according to claim 1, Detect the motion level in units of frames, Detecting the average motion level of the plurality of frames. A luminance difference detector for detecting luminance difference information of the current frame by using the luminance difference between the luminance data of the previous frame and the luminance data of the current frame; A cluster determination unit that determines a cluster state of pixels having luminance variations by using the detected luminance difference information from the luminance difference detection unit; A luminance change detector detecting a luminance change in a block determined by the cluster determination unit as a cluster state; An edge detector for filtering edge data of the current frame to detect edge components; And a motion level detector for detecting a motion level in accordance with the luminance change amount from the luminance change amount detector and the edge component from the edge detector. The method according to claim 5, The luminance change detection unit And counting the number of pixels having the luminance change in the block determined as the clustering state and outputting the number of pixels having the luminance change. The method according to claim 5, The edge detector And calculating the number of edge pixels by filtering the luminance data of the current frame and outputting the number of edge pixels as the edge components. The method according to claim 5, The motion level detector detects the motion level in units of frames, And an average motion level detector for inputting the motion level to detect an average motion level of a plurality of frames. An image processor for detecting a motion level according to a luminance variation and an edge component of input data, and modulating the input data by adjusting sharpness gain, overshoot and undershoot of overdriving according to the detected motion level; And a liquid crystal panel driver which displays data modulated by the image processor on the liquid crystal panel. The method according to claim 9, The image processor A color space converter for converting input data into luminance and color difference data; Detects the luminance change amount between the luminance data of the current frame and the luminance data of the previous frame, the edge component of the luminance data of the current frame from the color space converter, and detects the motion level according to the luminance change amount and the edge component. A motion detection circuit according to any one of claims 5 to 9; A sharpness filter for sharply filtering and modulating luminance data of the current frame by using sharpness gain adjusted according to the motion level from the motion detection cycle; A color space inverse transformer for inversely converting the modulated luminance data from the sharpness filter and the color difference data from the color space converter into second data; And an overdriving circuit for modulating the second data from the color space inverse transform unit into third data by using the overshoot and undershoot values adjusted according to the motion level from the motion detection cycle. Device. The method according to claim 10, A backlight including a plurality of lamps for irradiating light onto the liquid crystal panel; An inverter driving the backlight; And a backlight controller for controlling the scanning of the backlight through the inverter by adjusting the size of the scanning duty and the scanning lamp block to scan the plurality of lamps according to the motion level from the motion detection circuit. Liquid crystal display.

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