KR20020090587A - Apparatus and Method Of Processing Data - Google Patents

Abstract

PURPOSE: An apparatus and a method for processing data of a plasma display panel(PDP) are provided which can improve a picture quality by judging a movement accurately. CONSTITUTION: An average movement detection part(81) judges the amount of movement of an input image, and the first filter smooths data of an image having a high movement. The second filter emphasizes a clearness by filtering data of an image having a small movement. And a display panel displays an image using data filtered by the first filter or the second filter. The first filter is a low pass filter(LPF)(82), and the second filter is a high pass filter(HPF)(83).

Description

Data processing apparatus and method of plasma display panel {Apparatus and Method Of Processing Data}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus for a plasma display panel, and more particularly, to a data processing apparatus and method for a plasma display panel for accurately determining a moving image and improving image quality.

Plasma Display Panel (hereinafter referred to as "PDP") displays an image including text or graphics by emitting phosphors by 147 nm ultraviolet rays generated during discharge of He + Xe or Ne + Xe inert mixed gas. . Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP is formed on a scan / sustain electrode 12Y and a common sustain electrode 12Z formed on an upper substrate 11, and a lower substrate 16. An address electrode 17X is provided.

Each of the scan / sustain electrode 12Y and the common sustain electrode 12Z is formed of a transparent electrode, for example, Indium-Tin-Oxide (ITO).

Each of the scan / sustain electrode 12Y and the common sustain electrode 12Z is provided with a metal bus electrode 13 for reducing resistance.

An upper dielectric layer 14 and a passivation layer 15 are stacked on the upper substrate 11 on which the scan / sustain electrode 12Y and the common sustain electrode 12Z are formed. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. The passivation layer 15 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 15, magnesium oxide (MgO) is usually used.

The lower dielectric layer 18 and the partition wall 19 are formed on the lower substrate 16 on which the address electrode 17X is formed, and the phosphor layer 20 is coated on the surfaces of the lower dielectric layer 18 and the partition wall 19.

The address electrode 17X is formed in the direction crossing the scan / sustain electrode 12Y and the common sustain electrode 13Z. The partition wall 19 is formed in parallel with the address electrode 17X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 20 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue.

An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 11 and 16 and the partition wall 19.

The PDP is driven by dividing one frame into several subfields having different number of emission times in order to realize gray level of an image. Each subfield is further divided into a reset period for uniformly generating discharge, an address period for selecting a discharge cell, and a sustain period for implementing gray levels according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. In addition, each of the eight subfields is divided into an address period and a sustain period. Here, the reset period and the address period of each subfield are the same for each subfield, while the sustain period is 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. Is increased. As described above, since the sustain period is changed in each subfield, gray levels of an image can be realized.

The PDP may generate contour contour or false contour in a moving image because of the characteristic of realizing the gray level of the image by the combination of subfields. If pseudo contour noise occurs, pseudo contour appears on the screen, and thus the display quality is deteriorated. For example, as shown in FIGS. 2 and 3, when the left half of the screen is displayed with 127 gradation values and the right half of the screen is displayed with 128 gradation values, then the screen is moved to the right, two pixels on the boundary portion Since the light emitted from the eye is simultaneously seen by the naked eye, peak white, or white band, appears at the boundary between the gray scale values 127 and 128. On the contrary, when the left half of the screen is displayed with a gradation value of 128 and the right half of the screen is displayed with a gradation value of 127, the screen is moved to the right. A black belt will appear.

In order to remove such pseudo-contour noises, a subfield is divided into one or two subfields, a sequence of subfields is arranged, and subfields having different modes are provided. A method, a method of adding subfields, rearranging the order of subfields, an error diffusion method, and the like have been proposed. However, adding subfields causes insufficient sustain periods, making it difficult to increase the resolution and complicate the circuit configuration.

FIG. 4 schematically shows a driving device of the PDP shown in FIG. 1.

Referring to FIG. 4, the PDP driving apparatus includes a frame memory 40 connected to an input line of data RGB, and a first reverse gamma correction unit 41A connected between the frame memory 40 and the PDP 45. A second inverse gamma correction unit 41B connected between the error diffusion unit 42, the subfield mapping unit 43, and the data alignment unit 44, and the input line of the data RGB and the PDP 45; Unused fields connected between the line average detector 49, the frame average detector 48, the ROM address generator 47, and the waveform generator 46, and the subfield mapping unit 43 and the waveform generator 46. The detector 50 is provided.

The frame memory 40 stores one frame of data RGB and supplies the stored data to the first inverse gamma correction unit 41A.

The first inverse gamma correction unit 41A performs inverse gamma correction on the gamma corrected video signal supplied from the frame memory 40 to linearly convert the luminance value according to the gray value of the video signal. In addition, the first inverse gamma correction unit 41A adjusts the gradation range in three modes as shown in FIG. 5 according to the average luminance value of the frame detected by the frame average detector 48.

The error diffusion unit 42 serves to finely adjust the luminance value by diffusing the error component of the cell to the surrounding cells. To this end, the error diffusion unit 42 separates the data from the first inverse gamma correction unit 41A into the integer part and the fractional part and multiplies the fractional part by the coefficient of Floyd-Steinberg to the neighboring cells as shown in FIG. 6. This will spread the error.

The subfield mapping unit 43 separates data from the error diffusion unit 42 bit by bit, and corresponds to bit data corresponding to subfields of A mode and B mode in which the number of subfields is different or the luminance relative ratio of each subfield is set differently. Allocate This is to reduce pseudo contour noise that may be generated in the video. This subfield mapping section 43 is a first subfield mapping section 71A and a second subfield for mapping data from the error diffusion section 42 into subfields of A mode and B mode, respectively, as shown in FIG. The mapping unit 71B and the subfield output unit 72 alternately arrange and output the A mode data and the B mode data in the neighboring cells.

The data aligning unit 44 converts the image data input from the subfield mapping unit 43 in accordance with the resolution format of the PDP 45 and integrates the address driving integrated circuit (IC) of the PDP 45. It is to supply to).

The unused field detector 50 controls the waveform generator 46 by supplying information to the waveform generator 46 indicating the subfields that are not turned on in the subfields of the A mode and the B mode.

The second inverse gamma correction unit 41B performs inverse gamma correction on the gamma corrected data supplied from the input line and supplies the inverse gamma correction unit to the line average detection unit 49.

The line average detector 49 stores the data supplied from the second inverse gamma correction unit 41B by one line using a line memory (not shown) and calculates a luminance average value for one line.

The frame average detector 48 stores the data from the line average detector 49 in units of frames by using a frame memory (not shown) and calculates a luminance average value for one frame. The calculated frame luminance average value is supplied to the first inverse gamma correction unit 41A and the ROM address generator 47. By this frame luminance average value, the first inverse gamma correction unit 41A designates a gray scale range of the input data and performs inverse gamma correction.

The ROM address generator 47 generates a ROM address for selecting a waveform determined according to the frame luminance average value by using the frame luminance average value supplied from the frame average detector 48.

The waveform generator 46 selects the number of discharges in each subfield according to the unused field information supplied from the unused field detector 50 and the ROM address from the ROM address generator 47 so that the driving waveform of the PDP is generated. To generate a timing control signal.

As shown in FIG. 8 by the timing control signal output from the waveform generator 46, the number of subfields and the number of sustain pulses become small in a bright image according to the frame average luminance value, The number of subfields in the picture is relatively small and the number of sustain pulses is increased.

However, since the conventional PDP driving apparatus basically determines whether the moving picture is based on the average brightness of the frame, the determination of the moving picture is not accurate. For example, a still picture in which noise flickering in a dot pattern is mixed may be determined as a moving picture.

In the conventional PDP driving apparatus, since the motion is determined based on the average of the luminance of the frame, most of the background image is stopped when the moving part is mixed with the part that maintains the stationary state in one screen. There is a problem in that motion determination is incorrect, such as judging a mixed screen as a still picture. That is, the conventional PDP driving apparatus does not have a method for improving image quality for a screen having a low movement degree.

In addition, in the conventional PDP driving apparatus, in order to reduce video pseudo contour noise, display quality is poor, such as gradation range, sharpness or image quality, which can be expressed when subfields are mapped to various modes having different number of subfields or luminance weights. There is a problem.

Accordingly, an object of the present invention is to provide an apparatus and method for data processing of a PDP, which improves image quality by accurately determining the degree of motion.

1 is a perspective view showing a discharge cell structure of a conventional three-electrode AC surface discharge type plasma display panel.

FIG. 2 is a diagram schematically illustrating a moving object moving between boundaries of different gray scale regions in a moving image and an observer's eye following the moving image;

FIG. 3 is a diagram illustrating a phenomenon in which pseudo contour noise appears in a video as shown in FIG. 2; FIG.

FIG. 4 is a block diagram illustrating a driving device of the plasma display panel shown in FIG. 1.

FIG. 5 is a graph showing the gradation range adjusted by the inverse gamma correction unit shown in FIG. 4; FIG.

FIG. 6 is a diagram schematically illustrating a principle in which an error component is diffused to surrounding pixels by the error diffusion unit illustrated in FIG. 4.

FIG. 7 is a block diagram showing in detail the configuration of a subfield mapping unit shown in FIG. 4; FIG.

FIG. 8 is a graph illustrating a principle in which power consumption is kept constant by the driving apparatus of the PDP shown in FIG. 4.

9 is a block diagram showing a driving device of a plasma display panel according to a first embodiment of the present invention.

FIG. 10 is a diagram illustrating subfield mapping of an image having a lot of motion by the subfield mapping unit shown in FIG. 9; FIG.

FIG. 11 is a diagram illustrating subfield mapping of an image having small motion by the subfield mapping unit shown in FIG. 9; FIG.

12 is a block diagram showing a driving device of a plasma display panel according to a second embodiment of the present invention;

FIG. 13 is a diagram illustrating blocks determined by a block-by-block motion detector shown in FIG. 12; FIG.

<Description of Symbols for Main Parts of Drawings>

11: upper substrate 12Y: scan / sustain electrode

12Z: common sustain electrode 13: metal bus electrode

14 upper dielectric layer 15 protective film

16: lower substrate 17X: address electrode

18 lower dielectric layer 19 partition wall

20: fluorescent layer 40, 80, 100: frame memory

41A, 41B, 84A, 84B, 106A, 106B, 106C: Inverse gamma correction unit

42, 86, 108: error diffusion unit 43, 87, 109: subfield mapping unit

44, 89, 110: Data alignment unit 45, 90, 112: PDP

46, 91, 113: waveform generator 47, 93, 114: ROM address generator

48, 94, 115: frame average detector 49, 95, 116: line average detector

50, 88, 111: Unused field detector

In order to achieve the above objects, the data processing apparatus of the PDP according to the present invention includes a motion detection unit for determining the degree of motion of the input image, a first filter for smoothing the data of the image having a large degree of motion, and a small degree of motion. And a second filter for filtering the data of the image to emphasize the sharpness, and a display panel for displaying the image using the data filtered by the first or second filter.

The first filter may be a low pass filter.

The second filter may be a high pass filter.

A data processing apparatus of a PDP according to the present invention includes a motion detector for determining a motion degree for each of a plurality of blocks set to a predetermined size and divided into a plurality of screens, and a first data for smoothing data of a block having a large motion degree. A filter, a second filter for filtering the data of the block having a small degree of movement to emphasize the sharpness, and a display panel for displaying an image using the data filtered by the first filter or the second filter are provided.

The data processing method of the PDP according to the present invention comprises the steps of determining the degree of motion of the input image, smoothing the data of the image with a small degree of movement, filtering the data of the image with a small degree of movement to emphasize the sharpness; And displaying the image using the data filtered by the first or second filter.

The data processing method of the PDP according to the present invention comprises the steps of determining the degree of motion for each of a plurality of blocks set to a predetermined size and divided into a plurality of screens, smoothing data of blocks having a large degree of motion, and Filtering the data of the smallest block to emphasize the sharpness, and displaying the image using the smoothed data or the data with the sharpness highlighted.

Other objects and features of the present invention in addition to the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 9 to 13.

9, a data processing apparatus of a PDP according to the present invention includes a frame memory 80 connected to an input line of data RGB, an average motion detector 81 for detecting a degree of movement of one screen, Low pass filter (hereinafter referred to as " LPF ") 82 connected between the average motion detector 81 and the adder 85 and the first inverse gamma correction unit 84A, the LPF 82 and the first inverse gamma A high pass filter (hereinafter referred to as " HPF " 83) and a second inverse gamma correction unit 84B connected in parallel to the correction unit 84A, an error diffusion unit 86 connected to the adder 85, A third inverse gamma beam connected between the subfield mapping unit 87 and the data arranging unit 89 connected between the adder 85 and the PDP 90, and the input line of the data RGB and the PDP 90; 84C, line average detector 95, frame average detector 94, ROM address generator 93, and waveform generator 91, between subfield mapping unit 87 and waveform generator 91 Unused fields connected to The unit 88 is provided.

The frame memory 80 stores one frame of data RGB and supplies the stored data to the average motion detector 81.

The average motion detector 81 determines a luminance change with respect to the previous screen with respect to data of one screen input from the frame memory 80, calculates an average value of the luminance change, and outputs average motion information. The average motion information output from the average motion detector 81 is supplied in parallel to the LPF 82 and the HPF 83 together with the data RGB.

If the average motion information from the average motion detector 81 is equal to or greater than a predetermined threshold, the LPF 82 determines that the data RGB input from the average motion detector 81 has more motion than the previous screen, and thus the median filter Median. By using a filter, the data RGB can be smoothed. That is, the LPF 82 smoothes the moving images to smooth the quality of the surrounding images by averaging data values of the surrounding pixels by smoothing the surrounding images. In the data RGB of the peripheral pixels smoothed by the LPF 82, the data of the peripheral pixels, which may generate video pseudo contour noise, is smoothed so that input data values of each of the peripheral pixels are averaged or changed to other values. .

If the average motion information from the average motion detector 81 is smaller than a predetermined threshold, the HPF 83 judges that the data RGB input from the average motion detector 81 is smaller than the previous screen and that the data is smaller. High band filtering is performed on RGB to emphasize sharpness.

The first and second inverse gamma correction units 84A and 84B perform inverse gamma correction on the data input from the LPF 82 and the HPF 83, respectively, to linearize the data smoothed according to the gray value of the video signal. Will be converted to. In addition, the first and second inverse gamma correction units 84A and 84B adjust the gradation range in various modes as shown in FIG. 5 according to the average luminance value of the frame detected by the frame average detector 94.

The adder 85 adds data input from the first and second inverse gamma correction units 84A and 84B, respectively, and supplies the added data to the subfield mapping unit 87.

The error diffusion unit 86 serves to finely adjust the luminance value by diffusing an error component of the cell into neighboring cells. To this end, the error diffusion unit 86 separates the data from the adder 85 into the integer part and the fractional part and multiplies the fractional part by the coefficient of Floyd Steinberg to spread the error in the surrounding cells.

The subfield mapping unit 87 is configured with at least two modes in which the number of subfields is different or the luminance weight for each subfield is set differently. The subfield mapping unit 87 transfers the data from the adder 85 to subfields of different modes so that moving picture pseudo contour noise does not appear for a moving image according to the average motion information from the average motion detection unit 81. Will be mapped. For example, as shown in FIG. 9, the subfield mapping unit 87 displays subfields of different modes by 31 and 32, 63, 64, 127, and 128 for data between neighboring pixels that may generate video pseudo contour noise. Mapped to 30 and 32, 62 and 64, and 126 and 128 respectively. In addition, the subfield mapping unit 87 maintains the data value of the image having small motion in which moving picture outline noise does not occur as shown in FIG.

The data alignment unit 89 converts the image data input from the subfield mapping unit 87 in accordance with the resolution format of the PDP 90 and supplies the converted data to the address driving IC of the PDP 90.

The unused field detector 88 controls the waveform generator 91 by supplying it to the waveform generator 91 indicating a subfield that is not turned on in the mode selected by the subfield mapping unit 87.

The third inverse gamma correction unit 84C performs inverse gamma correction on the gamma corrected data supplied from the input line and supplies the inverse gamma correction unit to the line average detection unit 95.

The line average detector 95 stores the data supplied from the third inverse gamma correction unit 84C by one line using a line memory (not shown) and calculates a luminance average value for one line.

The frame average detector 94 stores data from the line average detector 95 in units of frames using a frame memory (not shown) and calculates a luminance average value for one frame. The calculated frame luminance average values are supplied to the first and second inverse gamma correction units 84A and 84B and the ROM address generator 93.

The ROM address generator 93 generates a ROM address for selecting a waveform determined according to the frame luminance average value by using the frame luminance average value supplied from the frame average detector 94.

The waveform generator 91 selects the number of discharges in each subfield according to the unused field information supplied from the unused field detector 88 and the ROM address from the ROM address generator 93, and the driving waveform of the PDP 90. A timing control signal for generating this is generated.

12 shows a data processing apparatus of a PDP according to a second embodiment of the present invention.

Referring to FIG. 12, a data processing apparatus of a PDP according to the present invention includes a frame memory 100 connected to an input line of data RGB, an average motion detector 101 for detecting a degree of motion of one screen, Determining the degree of motion of each block connected in common to the outputs of the block-by-block motion detector 102 and the average motion detector 101 and the block-by-block motion detector 102 for detecting the degree of motion for each pixel window block divided in one screen. The LPF 104 and the first inverse gamma correction unit 106A, the LPF 104 and the first inverse gamma beam connected between the unit 103, the block-level motion degree determining unit 103, and the adder 107, respectively. Between the HPF 105 and the second inverse gamma correction unit 106B connected in parallel with the unit 106A, the error diffusion unit 108 connected to the adder 107, and between the adder 107 and the PDP 112. Connected between the connected subfield mapping unit 109 and the data alignment unit 110, an input line of data RGB and the PDP 112. 3 inverse gamma correction unit 106C, line average detector 116, frame average detector 115, ROM address generator 114, waveform generator 113, subfield mapping unit 109, waveform generator The unused field detection part 111 connected between 113 is provided.

The frame memory 100 stores one frame of data RGB and supplies the stored data to the average motion detector 101 and the block motion detector 102.

The average motion detector 101 determines a luminance change with respect to the previous screen with respect to data of one screen input from the frame memory 100, calculates an average value of the luminance change, and outputs average motion information. The average motion information output from the average motion detector 101 is supplied to the block motion determining unit 102 along with the data RGB.

The block motion detecting unit 102 is divided into a matrix form in one screen as shown in FIG. 13, and an example of a window size including a predetermined number of pixel cells is a block of a previous screen in units of 9 × 9 pixel window blocks. The motion of each block is detected according to the luminance change between blocks of the current screen. The block-by-block motion information output from the block-by-block motion detector 102 is supplied to the block-by-block motion determiner 103 together with the data RGB.

The block motion determining unit 103 determines the motion amount of the entire screen according to the average motion information, and determines the motion level for each pixel window block in the screen according to the block motion information.

The LPF 104 performs smoothing on the frame data of the screen having a lot of motion or the block having a lot of motion, for example, the data of B1 to B6 blocks in FIG. 13 under the control of the motion degree determining unit 103 for each block. .

The HPF 105 controls the frame data of the small-motion screen or the small-motion block, for example, the data of the blocks of the background screen except for the B1 to B6 blocks in FIG. 13 under the control of the motion degree determining unit 103 for each block. High-band filtering is performed to emphasize sharpness.

The first and second inverse gamma correction units 106A and 106B perform inverse gamma correction on the data input from the LPF 104 and the HPF 105, respectively, to linearize the data smoothed according to the gray value of the video signal. Will be converted to. In addition, the first and second inverse gamma correction units 106A and 106B adjust the gradation range in several modes according to the average luminance value of the frame detected by the frame average detector 115.

The adder 107 adds data input from the first and second inverse gamma correction units 106A and 106B, respectively, and supplies the added data to the subfield mapping unit 109.

The error diffusion unit 108 serves to finely adjust the luminance value by diffusing an error component of the cell into neighboring cells.

The subfield mapping unit 109 is configured with at least two modes in which the number of subfields is different or the luminance weight for each subfield is set differently. The subfield mapping unit 109 controls the data from the adder 107 as shown in FIG. 10 so that moving picture pseudo contour noise does not appear for a moving image or a pixel window block under the control of the movement degree determining unit 103 for each block. Maps to subfields in different modes. In addition, the subfield mapping unit 109 maps the corresponding data to the subfield so as to maintain the data value of the image or pixel window block having small motion in which moving picture outline noise does not occur.

The data alignment unit 110 converts the image data input from the subfield mapping unit 109 in accordance with the resolution format of the PDP 112 and supplies the converted data to the address driving IC of the PDP 112.

The unused field detector 111 supplies the waveform generator 113 indicating a subfield that is not turned on in the mode selected by the subfield mapping unit 109 to control the waveform generator 113.

The third inverse gamma correction unit 106C performs inverse gamma correction on the gamma corrected data supplied from the input line and supplies the inverse gamma correction unit to the line average detection unit 116.

The line average detector 116 stores the data supplied from the third inverse gamma correction unit 106C by one line by using a line memory (not shown) and calculates a luminance average value for one line.

The frame average detector 115 stores data from the line average detector 116 in units of frames using a frame memory (not shown) and calculates a luminance average value for one frame. The calculated frame luminance average values are supplied to the first and second inverse gamma correction units 106A and 106B and the ROM address generator 114.

The ROM address generator 114 generates a ROM address for selecting a waveform determined according to the frame luminance average value by using the frame luminance average value supplied from the frame average detector 115.

The waveform generator 113 selects the number of discharges in each subfield according to the unused field information supplied from the unused field detector 111 and the ROM address from the ROM address generator 114, and the driving waveform of the PDP 112. A timing control signal for generating this is generated.

As described above, the driving apparatus and method of the PDP according to the present invention can accurately determine the degree of motion by detecting the motion of each block even on a small screen, and the contour noise (contour noise or false) in the video according to the degree of motion. It is possible to improve image quality by mapping to subfields so that contours do not occur and emphasizing fine gradation expression and sharpness in small motion images.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (10)

A motion detector for determining a degree of motion of the input image; A first filter for smoothing data of an image having a large degree of movement; A second filter for enhancing the sharpness by filtering the data of the image having the small movement degree; And a display panel for displaying an image by using the data filtered by the first filter or the second filter. The method of claim 1, And the first filter is a low pass filter. The method of claim 1, And the second filter is a high pass filter. The method of claim 1, A frame memory for storing the input image in one frame unit; A motion detector for detecting the degree of motion and supplying the motion to the first filter or the second filter; A gamma correction unit for gamma correcting a predetermined gradation range for each of the data output from the first filter or the second filter; An adder for adding data output from the gamma correction unit; An error diffusion unit connected to the addition unit to diffuse an error component between neighboring cells with respect to data output from the first filter or the second filter; Subfields for mapping data from the adder to subfields of a selected mode according to the degree of movement using at least two modes including the number of subfields each having a luminance weight set or subfields having different luminance weights. Mapping section, A frame average detector for controlling an gradation range of the gamma correction unit by detecting average brightness per screen of the input image; A data driver for supplying data from the subfield mapping unit to the display panel; A waveform generator for generating a driving waveform of the display panel; And an unused field detector for detecting an unused subfield according to a mode selected by the subfield mapping unit to control the waveform generator. A motion detector configured to determine a degree of motion for each of a plurality of blocks set to a predetermined size and divided into a plurality of blocks in the screen; A first filter for smoothing data of the block having a large degree of movement; A second filter for enhancing the sharpness by filtering the data of the small block of motion; And a display panel for displaying an image by using the data filtered by the first filter or the second filter. Determining a degree of movement of the input image; Smoothing data of an image having a large degree of movement; Enhancing the sharpness by filtering the data of the image having the small movement degree; And displaying an image by using the data filtered by the first filter or the second filter. The method of claim 6, The smoothing of the data may include low pass filtering the data of the input image. The method of claim 6, The step of emphasizing the sharpness of the data comprises the step of high pass filtering the data of the input image. The method of claim 6, Storing the input image in units of frames; Gamma correcting a predetermined gradation range for each of the data for which the smoothing or sharpness is emphasized; Adding the gamma corrected smoothing data or sharpness emphasis data; Diffusing an error component between neighboring cells with respect to the smoothing data or the sharpness enhancement data; Mapping the added data to subfields of a selected mode according to the degree of movement using at least two modes including the number of subfields each having a luminance weight set or subfields having different luminance weights; Controlling the gradation range of the gamma correction unit according to the average brightness per screen of the input image; And detecting unused subfields according to a mode selected when the subfields are mapped. Determining a degree of movement for each of a plurality of blocks set to a predetermined size and divided into a plurality of blocks in the screen; Smoothing data of the block having a large degree of movement; Enhancing the sharpness by filtering the data of the small block of motion; And displaying an image using the smoothed data or the data of which sharpness is emphasized.