KR101481668B1 - Liquid crystal display device and method for driving the same - Google Patents

Abstract

The present invention relates to a driving method of a liquid crystal display (LCD) capable of improving picture quality by using a CSF (Contrast Sensitivity Function) filter suitable for a human's visual acuity, Generating A; A step B for generating filtering data by filtering the frequency data using a CSF (Contrast Sensitivity Function) filter; And a step (C) of generating correction data by subtracting the filtering data from the frequency data.

A liquid crystal display, a low pass filter, a CSF (Contrast Sensitivity Function), a contrast

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal display device and a method of driving the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD), and more particularly, to a liquid crystal display device and a driving method thereof that can improve image quality by using a CSF (Contrast Sensitivity Function) filter suitable for human visual characteristics.

A conventional liquid crystal display device displays an image by adjusting the light transmittance of a liquid crystal using an electric field. To this end, a liquid crystal display device includes a liquid crystal panel in which pixel regions are arranged in a matrix form, and a driving circuit for driving the liquid crystal panel.

In a conventional liquid crystal display device, a Gaussian low pass filter or a band pass filter is used as an image filter for improving image quality.

FIG. 1 is a diagram showing the characteristics of a conventional low-pass filter. As shown in the figure, a frequency region located outside the dotted line, that is, a frequency region exceeding a predetermined threshold frequency is all filtered by the low-pass filter .

However, the conventional low-pass filter has the following problems.

First, since the conventional low-pass filter has a function that does not take human's sensory characteristics into consideration, it is difficult to expect an actual image quality improvement.

Second, since the conventional low-pass filter applies sharpness only to the luminance component, it is difficult to expect an improvement in image quality with respect to the color component.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a liquid crystal display device and a method of driving the same that can improve image quality by using a CSF (Contrast Sensitivity Function) have.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display (LCD) device, comprising: A step of converting original image data of one frame into a frequency form to generate frequency data; A step B for generating filtering data by filtering the frequency data using a CSF (Contrast Sensitivity Function) filter; And a step (C) of generating correction data by subtracting the filtering data from the frequency data.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display (LCD) device, comprising: A step of converting original image data of one frame into a frequency form to generate frequency data; A step B for generating filtering data by filtering the frequency data using a CSF (Contrast Sensitivity Function) filter; And a step C for generating correction data by adding a first correction value obtained by subtracting the filtering data from the frequency data and a second correction value obtained by multiplying each frequency region included in the frequency data by a constant, .

Further comprising a step D of inversely transforming the correction data from the step C to generate corrected image data.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display (LCD) device, comprising: A) separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A step B for converting the luminance data, the red-green data, and the blue-yellow data into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; The luminance frequency data is filtered by using a first CSF (Contrast Sensitivity Function) filter to generate luminance filtering data, and the red-green frequency data is filtered using a second CSF filter to generate red-green filtering data C) filtering the blue-yellow frequency data using a third CSF filter to generate blue-yellow filtering data; Generating luminance correction data by subtracting the luminance filtering data from the luminance frequency data, generating red-green correction data by subtracting the red-green filtering data from the red-green frequency data, and generating blue- And a step D for subtracting the blue-yellow filtering data from the data to generate blue-yellow correction data.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display (LCD) device, the method comprising: A separating original image data of a frame into luminance data, red-green data, and blue-yellow data; A step B for converting the luminance data, the red-green data, and the blue-yellow data into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; The luminance frequency data is filtered by using a first CSF (Contrast Sensitivity Function) filter to generate luminance filtering data, and the red-green frequency data is filtered using a second CSF filter to generate red-green filtering data C) filtering the blue-yellow frequency data using a third CSF filter to generate blue-yellow filtering data; Generating luminance correction data by adding a first correction value obtained by subtracting the luminance filtering data from the luminance frequency data to a second correction value obtained by multiplying each frequency region included in the luminance frequency data by a constant, Green filtering data and a second correction value obtained by multiplying each frequency region included in the red-green frequency data by a constant to generate red-green correction data, and the blue-yellow correction data is generated by adding the first correction value obtained by subtracting the red- A step D for generating blue-yellow correction data by adding a first correction value obtained by subtracting the blue-yellow filtering data from the frequency data and a second correction value obtained by multiplying each frequency region included in the blue-yellow frequency data by a constant, And the like.

Inverted luminance correction data by inversely frequency-converting the luminance correction data from the step (D), inversely transforming the red-green correction data from the step (D) to generate inverse red-green correction data, An E step of frequency-inverting the blue-yellow correction data to generate inverse converted blue-yellow correction data; And an F step of generating corrected image data by summing the inverse transformed luminance correction data, the inverse transformed red-green correction data, and the inverse transformed blue-yellow correction data from the step (E).

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a frequency converter for converting original image data of one frame into a frequency form to generate frequency data; A filtering unit for generating filtering data by filtering the frequency data from the frequency conversion unit using a CSF (Contrast Sensitivity Function) filter; And a data correction unit for generating correction data by subtracting the filtering data from the frequency data.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a frequency converter for converting original image data of one frame into a frequency form to generate frequency data; A filtering unit for generating filtering data by filtering the frequency data from the frequency conversion unit using a CSF (Contrast Sensitivity Function) filter; And a data correction unit for generating correction data by adding a first correction value obtained by subtracting the filtering data from the frequency data and a second correction value obtained by multiplying each frequency region included in the frequency data by a constant, .

According to an aspect of the present invention, there is provided a liquid crystal display including a channel separator for separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A frequency converter for converting the luminance data, the red-green data, and the blue-yellow data from the channel separator into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; A first CSF (Contrast Sensitivity Function) filter for filtering the luminance frequency data from the frequency converter to generate luminance filtering data, and a second CSF filter A filtering unit for generating blue-yellow filtering data to generate blue-yellow filtering data, and filtering the blue-yellow frequency data from the frequency converting unit using a third CSF filter; Generating luminance correction data by subtracting the luminance filtering data from the luminance frequency data, generating red-green correction data by subtracting the red-green filtering data from the red-green frequency data, and generating blue- And a data correction unit for subtracting the blue-yellow filtering data from the data to generate blue-yellow correction data.

According to an aspect of the present invention, there is provided a liquid crystal display including a channel separator for separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A frequency converter for converting the luminance data, the red-green data, and the blue-yellow data from the channel separator into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; Wherein the luminance frequency data from the frequency conversion unit is filtered using a first CSF (Contrast Sensitivity Function) filter to generate luminance filtering data, and the red-green frequency data from the frequency conversion unit is subjected to a second CSF filter A filtering unit for generating blue-yellow filtering data by filtering the blue-yellow filtering data using the third CSF filter, and generating blue-yellow filtering data by filtering the blue-yellow frequency data from the frequency converting unit using a third CSF filter; Generating luminance correction data by adding a first correction value obtained by subtracting the luminance filtering data from the luminance frequency data to a second correction value obtained by multiplying each frequency region included in the luminance frequency data by a constant, Green filtering data and a second correction value obtained by multiplying each frequency region included in the red-green frequency data by a constant to generate red-green correction data, and the blue-yellow correction data is generated by adding the first correction value obtained by subtracting the red- Yellow correction data by adding a first correction value obtained by subtracting the blue-yellow filtering data from the frequency data and a second correction value obtained by multiplying each frequency region included in the blue-yellow frequency data by a constant, And the like.

The liquid crystal display device and the driving method thereof according to the present invention have the following effects.

The liquid crystal display device according to the present invention can improve the image quality by using a CSF (Contrast Sensitivity Function) filter suitable for human visual acuity characteristics.

2 is a view illustrating a liquid crystal display device according to an embodiment of the present invention.

2, a display device according to an embodiment of the present invention includes a liquid crystal panel 500 for displaying an image, a data driver 502 for supplying a data signal to the liquid crystal panel 500, A gate driver 501 for supplying scan pulses to the liquid crystal panel 500 and a data driver 502 for generating various signals necessary for driving the data driver 502 and the gate driver 501, And a timing controller 120 for controlling the gate driver 501.

The liquid crystal panel 500 includes a plurality of gate lines GL1 to GLn arranged in one direction, a plurality of data lines DL1 to DLm arranged to vertically cross the gate lines GL1 to GLn, And pixel cells PXL formed for each pixel region defined by the gate lines GL1 to GLn and the data lines DL1 to DLm. The pixel cells PXL connected to the 3k + 1th data line are red pixel cells PXL representing a red image, and the pixel cells PXL connected to the 3k + 1th data line are green pixels And the pixel cells PXL connected to the (3k + 3) th data line are blue pixel cells (PXLs) representing a blue image. The red pixel cells PXL, the green pixel cells PXL, and the blue pixel cells PXL adjacent to each other are unit pixels representing one unit image.

And the (3k + 1) -th data line transmits red image data corresponding to the red image, the (3k + 2) -th data line transmits green image data corresponding to the green image, Transmits the blue image data corresponding to the blue image.

Although not shown in the figure, each pixel cell PXL includes a thin film transistor for receiving a scan pulse from the corresponding gate line and switching a data signal from the corresponding data line, and a pixel electrode And a liquid crystal cell formed between the pixel electrode and the common electrode to adjust a light transmittance according to a difference voltage (pixel voltage) between the data voltage and the common voltage.

The timing controller 120 rearranges image data (Data), which is digital video data from a system (not shown), in accordance with the liquid crystal panel 500 and supplies the image data to the data driver. The timing controller 120 controls the data driver using the timing control signals (the horizontal synchronization signal Vsync, the vertical synchronization signal Hsync, the dot clock DCLK, and the data enable DE) from the system And a gate control signal (GCS) for controlling the gate driver 501 are generated.

The data driver 502 generates image data Data in response to the data control signal DCS from the timing controller 120 based on the gamma reference voltages GMA from the gamma reference voltage generator And supplies the analog gamma compensation voltage to the data lines DL1 to DLm of the liquid crystal panel 500 as a data voltage. The data control signal DCS includes a source shift clock (SSC), a source start pulse (SSP), and a source output enable (SOE), and a polarity control signal.

The gate driver 501 generates a scan pulse in response to the gate control signal GCS from the timing controller 120 and sequentially supplies the scan pulse to the gate lines GL1 to GLn so that the image data Data The horizontal line of the supplied liquid crystal panel 500 is selected. The gate control signal GCS includes a gate start pulse, a gate shift clock, and a gate output enable signal.

An image quality correction unit for improving image quality is further provided between the timing controller 120 and the data driver 502 or between the system and the timing controller 120 or inside the timing controller 120. In the following example, the image quality correction unit describes an example in which image data (Data) between the timing controller 120 and the data driver 502 are relayed between the timing controller 120 and the data driver 502 .

FIG. 3 is a diagram illustrating an image quality correction unit according to the first embodiment of the present invention, and FIG. 4 is a diagram illustrating functions used in various CSF filters.

As shown in FIG. 3, the picture quality correction unit includes a frequency conversion unit 301, a filtering unit 302, an inverse frequency conversion unit 304, and a data correction unit 303.

The frequency converter 301 converts the original image data Data of one frame from the timing controller 120 into a frequency form to generate frequency data. The frequency converter 301 receives red image data, green image data, and blue image data included in the image data Data of one frame for each unit pixel. Then, red image data, green image data, and blue image data in each unit pixel are converted into a frequency form using an FFT (Fast Fourier Transform) equation. That is, the frequency converter 301 converts the sizes of the red image data, green image data, and blue image data into frequency units using the FFT formula. The image data Data converted into the frequency form through the frequency converter 301 is frequency data.

The filtering unit 302 generates filtering data by filtering the frequency data from the frequency conversion unit 301 using a CSF (Contrast Sensitivity Function) filter.

Here, the CSF will be described in detail as follows.

In other words, the human clock has a mixture of phases with clear boundaries, unclear phases, and contrasts with little differences. Vision refers to the overall ability of our eyes to recognize these various scenes. However, until now all visual acuity charts used in general vision tests are made only with clear boundaries and differences in contrast. Therefore, the discriminative ability of our eyes for images with unclear boundaries and small difference in contrast has been ignored. Contrast sensitivity is the ability of the eye to distinguish these images from those with poor contrast. The CSF filter is a filter that reflects the human sensibility characteristics well. The function used in the CSF filter indicates the relationship between the spatial frequency of the lattice stimulus and the contrast required to perceive the lattice. To measure the CSF we start with a sinusoidal grating with a very low frequency (wide bar), which is too low to see the grating, but just a homogeneous gray field of view. Increase the contrast of the grid a little, but increase it until people can barely see the bar. This contrast level is the threshold at which you can see the grid. To draw the CSF, contrast sensitivity = 1 / threshold value changes the threshold to contrast sensitivity. The CSF value is a reciprocal of the threshold value for recognizing the brightness difference, and the larger the CSF value is, the more easily the brightness change is perceived. Therefore, as shown in FIG. 4, human vision best perceives a change in brightness around 8 [cyle per degree], and does not perceive a change in brightness as the frequency increases. In other words, human vision does not perceive the changes that occur at relatively low frequencies, but detect changes at high frequencies.

FIG. 4 shows each function form for three types of CSF filter models. That is, functions for the Movshon CSF model, the Barten CSF model, and the Daly CSF model are shown.

In the present invention, a CSF filter of any one of the CSF models described above can be used.

As described above, the filtering unit 302 in the present invention generates filtering data using the above-described CSF filter, and provides the generated filtering data to the data correction unit 303. [

The data correction unit 303 receives frequency data as original image data from the frequency conversion unit 301 in addition to the filtering data.

The data correction unit 303 substitutes the filtering data and the image data Data into the following equation (1) to form correction data.

_{f enhanced (x, y) =} f (x, y) - f lp (x, y)

In Equation (1), f _enhanced (x, y) denotes a function for correction data, f (x, y) denotes a function for frequency data from the frequency transforming unit 301, _{and lp} (x, y) denotes a function for filtering data from the filtering unit 302. [ That is, the data correction unit 303 generates correction data by subtracting the filtering data from the frequency data.

The frequency inverse transformer 304 performs frequency inverse transform of the correction data from the data corrector 303 using an IFFT (Inverse Fast Fourier Transform) equation to generate corrected image data Data ·. The corrected image data (Data) from the frequency inverse transformer 304 is supplied to the data driver 502. [

Meanwhile, the data correcting unit 303 may generate correction data using the formula according to Equation (2) instead of Equation (1).

_{f highboost (x, y) =} (A-1) f (x, y) + f (x, y) - f lp (x, y)

In Equation 1, f _highboost (x, y) refers to a function of the correction data, and, f (x, y) is means a function of the frequency data from the frequency conversion unit 301, the f _lp (x, y) is means a function of the filtered data from the filter unit 302, and (a-1) is as a constant for adjusting the brightness of the original image data (data), and a is Means the correction intensity constant. If this intensity correction constant has a value between 1 and 2, the correction data is lower in brightness and higher in sharpness than the original image data (Data). If the intensity correction coefficient has a value between 2 and 3, the correction data is higher in luminance and sharpness than the original image data (Data). On the other hand, if the intensity correction constant has a value of 2, it becomes equal to Equation 1 described above. According to Equation (2), the data correction unit 303 combines the first correction value obtained by subtracting the filtering data from the frequency data, and the second correction value obtained by multiplying each frequency region included in the frequency data by a constant And generates correction data.

5 is a view illustrating an image quality correction unit according to a second embodiment of the present invention.

5, the image quality correction unit according to the second embodiment of the present invention includes a channel separation unit 501, a frequency conversion unit 502, a filtering unit 503, a data correction unit 504, Unit 505, and a channel integration unit 506. [

The channel separator 501 receives red image data, green image data, and blue image data included in the image data of one frame supplied from the timing controller 120 for each unit pixel. The channel separator 501 separates the luminance component, the red and green component data, and the blue and yellow component data from the image data Data.

The channel separator 501 includes a luminance separator 501a, a red-green image separator 501b, and a blue-yellow image separator 501c.

The luminance separator 501a generates luminance data representing the total luminance from the red image data, the green image data, and the blue image data to be supplied to each unit pixel. The red-green image separation unit 501b generates red-green data representing red and green from the red image data, green image data, and blue image data to be supplied to each unit pixel. The blue-yellow image separation unit 501c generates blue-yellow data representing blue and yellow from the red image data, green image data, and blue image data to be supplied to each unit pixel.

The frequency converter 502 converts the luminance data, the red-green data, and the blue-yellow data from the channel separator 501 into a frequency form to generate luminance frequency data, red-green frequency data, and blue- And generates data.

To this end, the frequency converter 502 includes first through third frequency converters 502a through 502c.

The first frequency conversion unit 502a generates luminance frequency data by converting the image data Data from the luminance separation unit 501a into a frequency form using the FFT formula and the second frequency conversion unit 502b generates the luminance frequency data Green frequency data by converting the red-green data from the red-green image separation unit 501b into a frequency form using the FFT formula, and the third frequency conversion unit 502c generates the red- And converts the blue-yellow data from the separator 501c into a frequency form using the FFT formula to generate blue-yellow frequency data.

The filtering unit 503 filters the luminance frequency data, the red-green frequency data, and the blue-yellow frequency data from the frequency conversion unit 502 using a CSF (Contrast Sensitivity Function) filter to generate luminance filtering data, Green filtering data, and blue-yellow filtering data.

To this end, the filtering unit 503 includes first through third filtering units 503a through 503c. The first to third filtering units 503a to 503c are filters having the above-described characteristics.

The first filtering unit 503a generates luminance filtering data by filtering the luminance frequency data from the first frequency converting unit 502a using the first CSF filter and the second filtering unit 503b generates the luminance filtering data using the second CSF Green filtering data by filtering the red-green frequency data from the second frequency transforming unit 502b using a filter, and the third filtering unit 503c uses the third CSF filter to generate the red- And generates blue-yellow filtering data by filtering the blue-yellow frequency data from the third frequency converter 502c.

The data correction unit 504 corrects the luminance filtering data, the red-green filtering data, and the blue-yellow filtering data from the filtering unit 503 using a correction formula having a function defined by the above-described Equation (1) Thereby generating luminance correction data, red-green correction data, and blue-yellow correction data.

To this end, the data correction unit 504 includes first through third data correction units 504a through 504c.

The first data correcting unit 504a generates luminance correction data by subtracting the luminance filtering data from the first filtering unit 503a from the luminance frequency data supplied from the first frequency converting unit 502a, The data correction unit 504b subtracts the red-green filtering data from the second filtering unit 503b from the red-green frequency data supplied from the second frequency conversion unit 502b to generate red-green correction data And the third data correcting unit 504c subtracts the blue-yellow filtering data from the third filtering unit 503c from the blue-yellow frequency data supplied from the third frequency converting unit 502c, And generates yellow correction data.

Meanwhile, the data correction unit 504 uses the correction formula having the function defined by the equation (2) instead of the equation (1) to calculate the luminance filtering data, the red-green filtering data, And the blue-yellow filtering data, thereby generating the luminance correction data, the red-green correction data, and the blue-yellow correction data.

At this time, the first data correcting unit 504a subtracts the luminance filtering data from the first filtering unit 503a from the luminance frequency data supplied from the first frequency converting unit 502a, The second data correction unit 504b generates the luminance correction data by adding the second correction value obtained by multiplying each frequency region included in the luminance frequency data by a constant, The first correction value obtained by subtracting the red-green filtering data from the second filtering unit 503b from the green frequency data is combined with the second correction value obtained by multiplying each frequency region included in the red-green frequency data by a constant, - green correction data from the blue-yellow frequency data supplied from the third frequency conversion unit 502c, and the third data correction unit 504c generates the green correction data from the blue- 3c) and a second correction value obtained by multiplying each frequency region included in the blue-yellow frequency data by a constant to generate blue-yellow correction data. Here, the constant means (A-1) described above, and A means the intensity correction constant.

The frequency inverse transform unit 505 inversely transforms the luminance correction data, the red-green correction data, and the blue-yellow correction data from the data correction unit 504 using the IFFT equation to inverse-transform the luminance correction data, the inverse- Data, and inverse converted blue-yellow correction data.

To this end, the frequency inverse transformer 505 includes first through third frequency inverse transformers 505a through 505c.

The first frequency inverse transform unit 505a inversely transforms the luminance correction data from the first data correction unit 504a using the IFFT equation to generate inverse transformed luminance correction data and the second frequency inverse transform unit 505b generates inverse transformed luminance correction data Green correction data by inverse-frequency-converting the red-green correction data from the data correction unit 504b using the IFFT equation, and the third frequency inverse transform unit 505c generates the inverse transformed red-green correction data using the third data correction unit 504c, Inverted blue-yellow correction data by frequency inverse conversion using the IFFT equation.

The channel integrating unit 506 integrates the inverse transformed luminance correction data from the first frequency inverse transform unit 505a, the inverse transformed red-green correction data from the second frequency inverse transform unit 505b, and the inverse transformed luminance data from the third frequency inverse transform unit 505c Inverted blue-yellow correction data to generate corrected image data (Data).

The corrected image data (Data) from the channel integrating unit 506 is supplied to the data driver 502. [

6 is a view for explaining image quality enhancement according to the liquid crystal display device according to the present invention.

6A shows the image quality of a conventional liquid crystal display device without an image filter, FIG. 6B shows the image quality of a conventional liquid crystal display device with a low-pass filter, FIG. 6C shows a CSF filter according to the present invention. The image quality of the liquid crystal display device.

As can be seen from FIG. 6, the contrast and sharpness of the liquid crystal display device having the CSF filter of the present invention are much better than those of the remaining conventional liquid crystal display devices.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

1 is a view showing characteristics of a conventional low-pass filter;

2 is a view illustrating a liquid crystal display device according to an embodiment of the present invention

3 is a diagram illustrating an image quality correction unit according to the first embodiment of the present invention.

4 is a diagram showing a function form used in various CSF filters;

5 is a diagram illustrating an image quality correction unit according to the second embodiment of the present invention.

6A to 6C are views for explaining image quality enhancement according to the liquid crystal display device according to the present invention;

Description of the Related Art

301: Frequency conversion unit 302: Filtering unit

303: Data correction unit 304: Frequency inverse transform unit

Claims (10)

Converting the original image data of one frame into a frequency form to generate frequency data; A step B for generating filtering data by filtering the frequency data using a CSF (Contrast Sensitivity Function) filter; And And generating the correction data by subtracting the filtered data from the frequency data. Converting the original image data of one frame into a frequency form to generate frequency data; A step B for generating filtering data by filtering the frequency data using a CSF (Contrast Sensitivity Function) filter; And And generating the correction data by adding a first correction value obtained by subtracting the filtered data from the frequency data and a second correction value obtained by multiplying each frequency region included in the frequency data by a constant, A method of driving a display device. 3. The method according to claim 1 or 2, Further comprising a step D of inverting the correction data from the step C to generate corrected image data. An A step of separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A step B for converting the luminance data, the red-green data, and the blue-yellow data into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; The luminance frequency data is filtered by using a first CSF (Contrast Sensitivity Function) filter to generate luminance filtering data, and the red-green frequency data is filtered using a second CSF filter to generate red-green filtering data C) filtering the blue-yellow frequency data using a third CSF filter to generate blue-yellow filtering data; Generating luminance correction data by subtracting the luminance filtering data from the luminance frequency data, generating red-green correction data by subtracting the red-green filtering data from the red-green frequency data, and generating blue- And D) subtracting the blue-yellow filtering data from the data to generate blue-yellow correction data. An A step of separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A step B for converting the luminance data, the red-green data, and the blue-yellow data into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; The luminance frequency data is filtered by using a first CSF (Contrast Sensitivity Function) filter to generate luminance filtering data, and the red-green frequency data is filtered using a second CSF filter to generate red-green filtering data C) filtering the blue-yellow frequency data using a third CSF filter to generate blue-yellow filtering data; Generating luminance correction data by adding a first correction value obtained by subtracting the luminance filtering data from the luminance frequency data to a second correction value obtained by multiplying each frequency region included in the luminance frequency data by a constant, Green filtering data and a second correction value obtained by multiplying each frequency region included in the red-green frequency data by a constant to generate red-green correction data, and the blue-yellow correction data is generated by adding the first correction value obtained by subtracting the red- A step D for generating blue-yellow correction data by adding a first correction value obtained by subtracting the blue-yellow filtering data from the frequency data and a second correction value obtained by multiplying each frequency region included in the blue-yellow frequency data by a constant, And a driving method of the liquid crystal display device. The method according to claim 4 or 5, Inverted luminance correction data by inversely frequency-converting the luminance correction data from the step (D), inversely transforming the red-green correction data from the step (D) to generate inverse red-green correction data, E step of inversely transforming the blue-yellow correction data to generate inverted blue-yellow correction data; And Further comprising an F step of generating corrected image data by adding inverse conversion luminance correction data from the E step, inverse red-green correction data, and inverse conversion blue-yellow correction data. A frequency converter for converting the original image data of one frame into a frequency form to generate frequency data; A filtering unit for generating filtering data by filtering the frequency data from the frequency conversion unit using a CSF (Contrast Sensitivity Function) filter; And And a data correction unit for generating correction data by subtracting the filtered data from the frequency data. A frequency converter for converting the original image data of one frame into a frequency form to generate frequency data; A filtering unit for generating filtering data by filtering the frequency data from the frequency conversion unit using a CSF (Contrast Sensitivity Function) filter; And And a data correction unit for generating correction data by adding a first correction value obtained by subtracting the filtering data from the frequency data to a second correction value obtained by multiplying each frequency region included in the frequency data by a constant, Display device. A channel separator for separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A frequency converter for converting the luminance data, the red-green data, and the blue-yellow data from the channel separator into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; A first CSF (Contrast Sensitivity Function) filter for filtering the luminance frequency data from the frequency converter to generate luminance filtering data, and a second CSF filter A filtering unit for generating blue-yellow filtering data to generate blue-yellow filtering data, and filtering the blue-yellow frequency data from the frequency converting unit using a third CSF filter; Generating luminance correction data by subtracting the luminance filtering data from the luminance frequency data, generating red-green correction data by subtracting the red-green filtering data from the red-green frequency data, and generating blue- And a data correction unit for subtracting the blue-yellow filtering data from the data to generate blue-yellow correction data. A channel separator for separating original image data of one frame into luminance data, red-green data, and blue-yellow data; A frequency converter for converting the luminance data, the red-green data, and the blue-yellow data from the channel separator into a frequency form to generate luminance frequency data, red-green frequency data, and blue-yellow frequency data; A first CSF (Contrast Sensitivity Function) filter for filtering the luminance frequency data from the frequency converter to generate luminance filtering data, and a second CSF filter A filtering unit for generating blue-yellow filtering data to generate blue-yellow filtering data, and filtering the blue-yellow frequency data from the frequency converting unit using a third CSF filter; Generating luminance correction data by adding a first correction value obtained by subtracting the luminance filtering data from the luminance frequency data to a second correction value obtained by multiplying each frequency region included in the luminance frequency data by a constant, Green filtering data and a second correction value obtained by multiplying each frequency region included in the red-green frequency data by a constant to generate red-green correction data, and the blue-yellow correction data is generated by adding the first correction value obtained by subtracting the red- Yellow correction data by adding a first correction value obtained by subtracting the blue-yellow filtering data from the frequency data and a second correction value obtained by multiplying each frequency region included in the blue-yellow frequency data by a constant, And the liquid crystal display device.

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