KR101222961B1 - Liquid crystal display device and method for driving the same - Google Patents

Abstract

The present invention relates to a liquid crystal display and a method of driving the same, including a plurality of lookup tables for correcting the brightness of image data, and to generating white data using image data of three colors input from the outside. And a data converter configured to convert the white data and the image data of the three colors into four colors of modulated data and output the modulated data.

Data converter, lookup table, luminance correction data

Description

Liquid crystal display device and method for driving the same

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining a data unit included in a driving device of a conventional liquid crystal display.

2 is a block diagram showing a driving device of the liquid crystal display device according to the first embodiment of the present invention.

3 is a block diagram showing in detail the data converter of FIG. 2 according to the first embodiment of the present invention.

4 is a graph illustrating the lookup table of FIG. 3 according to an exemplary embodiment of the present invention.

5 is a configuration diagram specifically showing the data driver of FIG. 2 according to an embodiment of the present invention.

FIG. 6 is a diagram for describing a gamma voltage output from a gamma voltage generator of FIG. 5.

7 is a block diagram illustrating in detail the data converter of FIG. 2 according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a driving method thereof, by including a plurality of look-up tables for correcting luminance of image data.

As the information society develops, the demand for flat panel displays is increasing in various forms, and in recent years, liquid crystal displays, field emission displays, and plasma displays have been developed. Flat panel display devices such as panels and light emitting displays have been actively studied.

Among them, the liquid crystal display is the most widely used, replacing the Cathode Ray Tube for mobile image display because of its excellent image quality, light weight, thinness, and low power consumption. In addition to the mobile use, such as a TV and a computer monitor for receiving and displaying broadcast signals have been developed in various ways.

Such a liquid crystal display may be classified into a liquid crystal panel displaying a video signal and a driving circuit applying a driving signal to the liquid crystal panel.

Although not shown in the drawings, the liquid crystal panel is a display device in which a liquid crystal is injected between two substrates bonded to each other with a predetermined space. A plurality of data lines arranged at regular intervals in a vertical direction to the lines, a plurality of pixel electrodes formed in each pixel region in a matrix form defined by the gate lines and the data lines, and the signals of the gate lines A plurality of thin film transistors applying a signal of the data line to each pixel electrode is formed at a portion where the gate line and the data line cross each other. A color filter layer, a common electrode, and a black matrix layer are formed on the remaining substrates. Therefore, when the turn-on signal is sequentially applied to each of the gate lines, an image is displayed because the data signal is applied to the pixel electrode of the corresponding line.

As a method for increasing the luminance of an image represented by the liquid crystal display, a liquid crystal display having a four-color RGBW pixel structure in which a white subpixel is added to an RGB subpixel of a three-color RGB type has been proposed. .

That is, in order to drive a liquid crystal panel having a four-color RGBW pixel structure, a data unit for converting three-color RGB data into four-color RGBW data is added.

 1 is a view for explaining a data unit included in a driving device of a conventional liquid crystal display.

As shown in FIG. 1, the data unit compares the luminance values of the input image data R, G, and B, and outputs a minimum luminance value Ymin and a maximum luminance value Ymax. A look up table (LUT) 11 for outputting a value corresponding to the minimum luminance value Ymin output from the comparator 10 as white data Wo; and the image data R And first and third arithmetic circuits 12, 13, and 14 that receive G, B and the maximum luminance value Ymax, respectively, and output modulation data (Ro, Bo, Go) of three colors. .

Since the white portion W is added to the data portion using three colors of RGB data, in order to express the four colors of RGBW data, the luminance value should be corrected so that no overflow occurs. Thus, the lookup table 11 and the first to third arithmetic circuits 12, 13, and 14 are provided.

An example in which the data unit converts three colors of image data R, G, and B to generate four colors of modulation data Ro, Go, Bo, and Wo will be described below.

When the luminance value Y of the input data R, G, and B is 240, the green value G is 160, and the blue value B is 120, the dual minimum luminance value ( Ymin) is 120 which is a blue (B) value.

Accordingly, the blue (B) value 120 determined as the minimum luminance value (Ymin) is determined as the corresponding white (Wo) value by the look-up table 11, wherein the three-color image data (R, G, B) is converted by the following equation (1) in the first to third arithmetic circuits (12, 13, 14).

Ro = ((Ymax (R, G, B) + Ymin (R, G, B)) × Y (R) / Ymax (R, G, B)-Ymin (R, G, B)

Go = ((Ymax (R, G, B) + Ymin (R, G, B)) × Y (G)) / Ymax (R, G, B)-Ymin (R, G, B)

Bo = ((Ymax (R, G, B) + Ymin (R, G, B)) × Y (B)) / Ymax (R, G, B)-Ymin (R, G, B)

Based on Equation 1, the red output value Ro, the green output value Go, and the blue output value Bo are determined to be 240, 120, and 60, respectively.

However, the driving apparatus of the conventional liquid crystal display device as described above has the following problems.

When the red output value Ro, the green output value Go, and the blue output value Bo are outputted, a calculation circuit for calculating the respective data R, G, and B is required. There is a disadvantage that the operation speed is slow because it becomes complicated and a complicated operation must be performed.

The present invention has been made to solve the above problems, and to provide a liquid crystal display device and a driving method thereof which can improve the image quality of the image while increasing the operating speed of the liquid crystal display device.

The liquid crystal display according to the first exemplary embodiment of the present invention for generating the above object generates white data by using image data of three colors input from the outside, and generates the white data and the image data of the three colors. And a data driver for converting and outputting the four color modulation data into an analog signal, and converting the four color modulation data into an analog signal and supplying the same to the liquid crystal panel.

The data converter may include: a data amplifier configured to amplify the three-color image data by a gain value externally input; a white data extractor configured to extract white data using the data amplified by the data amplifier; A first look-up table for correcting the luminance value using the white data to implement a second value, and a second for correcting the luminance value according to the red image data to implement red data and shifting the color coordinates and color temperature of the image. A look-up table, a third look-up table for correcting a luminance value according to the green image data to implement green data, and correcting an overflow of the luminance value due to addition of the white data, and for implementing blue data When the luminance value is corrected according to the blue image data and the color coordinate and the color temperature are shifted It characterized in that the configuration includes a fourth look-up table to correct for group.

The data driver includes a shift register for sequentially generating a shift signal, a latch unit for latching and outputting the modulated data of the four colors by one line, and between a maximum gray value and a minimum gray value centered on a common voltage. A gamma voltage generator for generating and outputting a positive gamma voltage and a negative gamma voltage in a diagonal form (primary curve); and a gamma voltage generated by the gamma voltage generator according to the four-color modulation data output from the latch unit. It is characterized in that it comprises a digital-to-analog converter for converting and outputting an analog signal.

The driving apparatus and driving method of the liquid crystal display according to the present invention having the above characteristics will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram illustrating a driving device of a liquid crystal display according to a first embodiment of the present invention.

As shown in FIG. 2, the driving apparatus of the liquid crystal display according to the first exemplary embodiment of the present invention includes n gate lines GL1 to GLn and m data lines DL1 arranged to cross each other in a direction perpendicular to each other. A liquid crystal panel 102 including four sub-pixels defined by the first to second DLm, a data driver 104 for supplying a modulated image signal to the data lines DL1 to DLm, and the gate line. The gate driver 106 for supplying the scan pulse to the fields GL1 to GLn and the image data R, G, and B of three colors input from the outside, and the modulation data (Ro, Go, Bo, and Wo) of four colors. Data conversion unit 110 converts and outputs the modulated data Ro, Go, Bo, and Wo from the data conversion unit 110 to the data driver 104 to supply the data control signal. (DCS) is generated to control the data driver 104 and simultaneously gate The timing controller 108 generates a control signal GCS to control the gate driver 106.

The liquid crystal panel 102 includes a thin film transistor TFT formed in each sub pixel region defined by the n gate lines GL1 through GLn and the m data lines DL1 through DLm, and the thin film transistor TFT. 4 sub-pixels connected to each other. The thin film transistor TFT supplies an image signal from the data lines DL1 to DLm to the four sub-pixels in response to a scan pulse from the gate lines GL1 to GLn. The four subpixels face the common electrode with a liquid crystal interposed therebetween to form a liquid crystal capacitor Clc, and overlap the previous gate lines GL1 to GLn to form a storage capacitor Cst. The liquid crystal capacitor Clc and the storage capacitor Cst maintain a data signal applied to the pixel electrode until a next data signal is applied.

The data converter 110 amplifies the image data R, G, and B using the input gain value, compares the gray value of the amplified data, and sets the minimum value as a white gray value. To generate white modulated data corresponding to the white gray value. In addition, the respective modulation data (Ro, Go, Bo) of the red (R), green (G), and blue (B) data is generated and output.

The timing controller 108 arranges the modulation data Ro, Go, Bo, and Wo supplied from the data converter 110 to be suitable for driving the liquid crystal panel 102 and supplies the data to the data driver 104. do. In addition, the timing controller 108 uses the main clock MCLK, the data enable signal DE, and the horizontal and vertical synchronization signals Hsync and Vsync, which are input from the outside, to control the data control signal DCS and the gate control signal. (GCS) is generated to control driving timings of the data driver 104 and the gate driver 106, respectively.

The gate driver 106 includes a shift register that sequentially generates scan pulses, that is, gate high pulses, in response to a gate start pulse and a gate shift clock among the gate control signals GCS from the timing controller 108. The thin film transistor TFT is turned on in response to the scan pulse.

The data driver 104 is an analog signal using a gamma voltage corresponding to the modulation data MData arranged from the timing controller 108 according to the data control signal DCS supplied from the timing controller 108. The signal is converted into a signal and supplied to the data lines DL1 to DLm for one horizontal line for each horizontal period in which scan pulses are supplied to the gate lines GL1 to GLn. That is, the data driver 4 selects a gamma voltage having a predetermined level corresponding to the aligned modulation data MData, and supplies the selected gamma voltage to the data lines DL1 to DLm.

3 is a block diagram illustrating in detail the data converter of FIG. 2 according to the first embodiment of the present invention.

As illustrated in FIG. 3, the data converter 110 may include a data amplifier 140 for amplifying the image data R, G, and B using a gain value Gain set in advance. The white data extracting unit 141 extracts the white gray value W from the gray value of the amplified data R'G'B ', and the first lookup table that corrects the luminance for implementing the white gray. 142, a second lookup table 143 for correcting luminance for implementing red gradation, shifting color coordinates and color temperature of an image to be expressed, and data for determining overall luminance while implementing green gradation. As a result, a third look-up table 144 for correcting the overflow of the luminance due to the addition of the white gradation, and a fourth look for shifting the expressed color coordinates and the color temperature are corrected for correcting the luminance for implementing the blue gradation. Up Table (145) Is provided.

The data amplifier 140 multiplies the gain value Gain set in the input image data R, G, and B as shown in Equation 2 below to calculate the amplified data R ', G', and B '. Occurs. The gain value Gain may be set to a range of “1 ≦ G <2” and may be supplied to the data amplifier 140.

R '= R × Gain

G '= G × Gain

B '= B × Gain

The white data extractor 141 extracts the white data W from the amplified data R ′, G ′, and B ′ input from the data amplifier 140. At this time. The white data W is determined as a minimum value among the grayscale values of each of the common components of the amplified data R ', G' and B ', that is, the amplified data R', G 'and B'. In addition, the white data W may be set as a difference between the maximum gray value and the minimum gray value or an average gray value among the gray values of each of the amplified data R ', G', and B '.

4 is a graph illustrating the lookup table of FIG. 3 according to the present invention.

As shown in Fig. 4, since white data W is added to the image data R, G, and B of three colors, an overflow occurs to express the image data R, G, B, and W of four colors. The luminance value should be corrected so that does not occur. Therefore, the respective lookups can output four-color modulation data (Ro, Go, Bo, and Wo) corresponding to the four-color image data (R, G, B, and W) to which the white data (W) is added. Tables 142, 143, 144 and 145 are provided.

In the plurality of lookup tables 142, 143, 144, and 145, modulation data (Ro, Go, Bo, and Wo) whose luminance values are corrected to implement each input image data R, G, B, and W do not overflow. Is set. Therefore, here, the gradation curve for extracting the modulation data Ro, Go, Bo, and Wo is set in the form of a secondary curve.

Specifically, the W curve is for correcting the luminance of the white gray scale, and the first look-up table 142 outputs modulated white data (Wo) set by the W curve in response to the input white data (W). do.

The R curve corrects the luminance of the red gradation and shifts the color coordinates and the color temperature of the image to be expressed. The second look-up table 143 is a modulation set by the R curve in response to the input red data R. Outputted red data (Ro).

The G curve is a reference curve that determines the overall luminance. The G curve is used to correct the luminance of the green gradation, and to correct the overflow of the luminance due to the addition of the white gradation. The third look-up table 144 may include the input green data. Corresponding to (G), the modulated green data Go set by the G curve is output.

The B curve corrects the luminance of the blue gray and shifts the color coordinates and the color temperature of the image to be expressed. The fourth look-up table 145 is a modulation set by the B curve corresponding to the input blue data B. Outputs blue data (Bo).

The curve set to extract the modulation data (Ro, Go, Bo, Wo) may be generated as an experimental value using the liquid crystal display devices that have been verified in the past, and the image quality of the image expressed according to the size and use conditions of the liquid crystal display device. It can be applied as the optimum setting value to improve the

FIG. 5 is a block diagram specifically illustrating the data driver of FIG. 2 according to the present invention. FIG.

As shown in FIG. 5, the data driver 104 includes a shift register 151 for sequentially generating a shift clock signal, a latch unit 152 for latching data, and a digital-to-analog converter. An analog converter (DAC) 153, a gamma voltage generator 155 for applying a gamma voltage to the DAC 153, and an output buffer 154.

The shift register 151 sequentially generates a shift clock signal to the latch unit 152 in response to a source start pulse (SSP) and a source sampling clock (SSC). The latch unit 152 latches the aligned modulation data (MData) by one line and transfers one line of modulation data to the DAC 153 according to a signal of a source output enable (SOE). do.

The gamma voltage generator 155 generates positive and negative gamma voltages and supplies them to the DAC 153. The DAC 153 supplies the supplied positive and negative gamma voltages and the latch unit 152. The grayscale voltage corresponding to the modulation data Ro, Go, Bo, and Wo is inputted to the output buffer 154. Thereafter, the output buffer 154 supplies the gray voltage to the data line.

FIG. 6 is a diagram for describing a gamma voltage output from the gamma voltage generator of FIG. 5.

As shown in FIG. 6, the gamma voltage generator 155 according to the present invention has a positive gamma voltage in a diagonal form (primary curve) between a maximum gray value and a minimum gray value centered on a common voltage Vcom. PNAM and negative gamma voltage NGAM are generated. This is because the modulated data Ro, Go, Bo, and Wo output from the data converter 110 are converted into data set in consideration of the luminance correction of the image.

The driving method of the liquid crystal display using the driving apparatus of the liquid crystal display according to the first embodiment of the present invention will be described below.

The image data R, G, and B input from the outside are amplified by the gain value Gain input from the data amplifier 140 included in the data converter 110. Thereafter, the gray scale values of the amplified data R ', G' and B 'transmitted from the data amplifier 140 are compared, and the minimum gray scale value is set as the white data W. FIG. In addition, the first lookup table 142 outputs white modulated data (Wo) corresponding to the white data (W).

On the other hand, the second lookup table generates red modulation data Ro corresponding to the input red data R, and the third lookup table generates green modulation data Go corresponding to the input green data G. In the fourth lookup table, blue modulation data Bo corresponding to the input blue data B is generated. Thereafter, the modulation data Ro, Go, Bo, and Wo may be transmitted to the timing controller 108 to be displayed as a color image on the liquid crystal panel 102.

Therefore, the liquid crystal display and the driving method thereof according to the first exemplary embodiment of the present invention generate white data W by using the minimum gray value of the input image data R, G, and B, and modulate corresponding white data. The operation speed can be increased by providing a plurality of lookup tables 142, 143, 144, and 145 capable of outputting data Ro, Go, Bo, and Wo. In addition, since the data according to the best experimental value can be set as the modulation data (Ro, Go, Bo, Wo), the image quality of the image can be improved.

The liquid crystal display according to the second exemplary embodiment of the present invention extracts luminance data of three-color image data input from the outside, generates white data using the luminance data, and includes the three data including the white data. And a data driver for converting the video data into four color modulation data and outputting the same, and a data driver for converting the four color modulation data into an analog signal and supplying the analog data to the liquid crystal panel.

The data converter may include a luminance / color difference separator that separates image data input from the outside into luminance data and color difference data, a delay unit for delaying the color difference data, and amplify the luminance data with an externally gain value. A luminance amplifier configured to mix the delayed color difference data and the amplified luminance data to generate amplified image data, a first lookup table configured to correct luminance values using the white data to implement white data; A second lookup table for correcting the luminance value according to the amplified red data to implement red data and shifting the color coordinates and the color temperature of the image; and a luminance value according to the amplified green data to implement green data. To correct and to correct the overflow of the luminance value due to the addition of the white data And a fourth lookup table for correcting luminance values and shifting color coordinates and color temperatures according to the amplified blue data to implement blue data.

FIG. 7 is a configuration diagram illustrating in detail the data converter of FIG. 2 according to an exemplary embodiment of the present invention.

Referring to FIG. 7 and FIG. 1, the data converter 110 according to the second embodiment of the present invention uses four colors of luminance data Y of the image data R, G, and B input from the outside. Modulated data Ro, Go, Bo, and Wo are generated and transmitted to the timing controller 108.

To this end, the data converter 110 according to the second exemplary embodiment of the present invention separates the image data R, G, and B input from the outside into luminance data Y and color difference data U and V. Amplifying the gradation value of the luminance data Y using the color difference separator 171, the delay unit 172 for delaying the color difference data U and V, and the input gain value Gain. A mixing unit 174 for generating amplified image data RI, GI, and BI by mixing the luminance amplifying unit 173 and the delayed color difference data DU and DV with the amplified luminance data WI, and FIG. The first to fourth lookup tables 175, 176, 177 and 178 for correcting the luminance value of the four-color image outputting the corrected value according to the input value as shown in FIG. 4 are configured. The first lookup table 178 corrects the white luminance data WI to implement the white gradation, and corrects the luminance of the amplified red data RI to implement red gradation. A second look-up table 175 for shifting the color coordinates and the color temperature of the image, and correcting the luminance of the amplified green data GI to determine the overall luminance while implementing the green gradation, and further adding the white gradation. A third look-up table 176 for correcting the overflow of luminance due to brightness, and a fourth look for shifting the color coordinates and color temperature expressed, correcting the luminance of the amplified blue data BI to implement the blue gradation. An up table 177 is provided.

As such, the driving apparatus of the liquid crystal display according to the second exemplary embodiment of the present invention is the driving apparatus of the liquid crystal display according to the first exemplary embodiment of the present invention shown in FIG. 2 except for the data converter 110. Since the configuration is the same as the description of the same configuration will be replaced with the description of the first embodiment of the present invention.

The luminance / color difference separator 171 separates the luminance Y and the color difference U and V of the image data R, G, and B input from the outside. The luminance data Y and the color difference data U and V are obtained by the following equations (3) to (5).

Y = 0.229 × R + 0.587 × G + 0.114 × B

U = 0.493 × (B-Y)

V = 0.887 × (R-Y)

The luminance / color difference separator 171 supplies the luminance data Y separated from the image data R, G, and B to the luminance amplifier 173 by using Equations 3 to 5, and separates the separated color difference. The data U and V are supplied to the delay unit 172.

The luminance amplifier 173 multiplies a luminance value Y input from the luminance data Y input from the luminance / color difference separator 171 to generate the amplified luminance data WI. The gain value Gain may be set to a range of “1 ≦ G <2” and may be supplied to the data amplifier 140.

The delay unit 172 delays the color difference data U and V while amplifying the luminance data Y by the luminance amplifier 173 to generate the luminance data WI, thereby causing the color difference data DU and DV. Is transmitted to the mixing unit 174.

The mixer 174 mixes the color difference data DU and DV delayed by the delay unit 172 and the luminance data WI amplified by the luminance amplifier 173 to amplify the image data RI, GI, Create BI). In this case, the amplified image data (RI, GI, BI) is obtained by the following equations (6) to (8).

RI = WI + 0.000 × DU + 1.140 × DV

GI = WI-0.396 × DU-0.581 × DV

BI = WI + 2.029 × DU + 0.000 × DV

The plurality of look-up tables 175, 176, 177, and 178 may generate modulation data Ro, Go, Bo, and Wo in response to grayscale values of the amplified image data RI, GI, BI, and amplified white luminance data WI. Output In this case, the luminance data WI amplified by the luminance amplifier 173 is set as white data WI.

The lookup tables 175, 176, 177, and 178 for extracting the modulation data Ro, Go, Bo, and Wo in response to the gray scale values of the amplified data RI, GI, BI, and WI are described with reference to the graph of FIG. 4. Can be explained.

As shown in FIG. 4, the grayscale curve for extracting the modulation data (Ro, Go, Bo, Wo) in response to the grayscale values of the amplified data (RI, GI, BI, WI) is set in the form of a secondary curve. do.

Specifically, the W curve is for correcting the luminance of the white gray level, and the first lookup table 175 is modulated by the W curve corresponding to the input luminance data WI, that is, the white data WI. Outputs white data (Wo).

The R curve corrects the luminance of the red gray and shifts the color coordinates and the color temperature of the image to be expressed. The second look-up table 176 is modulated by the R curve corresponding to the amplified red data RI. Outputs red data Ro.

The G curve is a reference curve that determines the overall luminance. The G curve is used to correct the luminance of the green gradation and to correct the overflow of the luminance due to the addition of the white gradation. The modulated green data Go set by the G curve is output in response to GI.

The B curve corrects the luminance of the blue gradation and shifts the color coordinates and the color temperature of the image to be expressed. The fourth lookup table 178 is a modulation set by the B curve corresponding to the amplified blue data BI. Outputs blue data (Bo).

The curve set to extract the modulation data (Ro, Go, Bo, Wo) may be generated as an experimental value using the liquid crystal display devices that have been verified in the past, and the image quality of the image expressed according to the size and use conditions of the liquid crystal display device. It can be applied as the optimum setting value to improve the

The driving method of the liquid crystal display using the driving apparatus of the liquid crystal display according to the second embodiment of the present invention will be described below.

First, externally input image data R, G, and B are separated into luminance data Y and color difference data DU and DV, and the color difference data DU and DV are supplied to the delay unit 172. In addition, the separated luminance data Y is supplied to the luminance / color difference separator 171.

Thereafter, the separated luminance data Y is amplified using the input gain value Gain, and the amplified luminance data WI is compared with the color difference data DU and DV delayed by the delay unit 172. The amplified image data (RI, GI, BI) is generated by mixing. The amplified luminance data WI is set as white data W to generate white modulated data W corresponding to the white data W in the first lookup table 178.

Meanwhile, the second lookup table 175 generates red modulation data Ro corresponding to the input red data RI, and the third lookup table 176 corresponds to the input green data GI. The green modulation data Go is generated, and the fourth lookup table 177 generates blue modulation data Bo corresponding to the input blue data BI. Thereafter, the modulation data Ro, Go, Bo, and Wo may be transmitted to the timing controller 108 to be displayed as a color image on the liquid crystal panel 102.

Therefore, the liquid crystal display and the driving method thereof according to the second embodiment of the present invention generate the white data W by using the luminance data Y of the input image data R, G, and B, and correspond thereto. The operation speed can be increased by including a plurality of lookup tables 142, 143, 144, and 145 capable of outputting modulation data Ro, Go, Bo, and Wo. In addition, since the data according to the best experimental value can be set as the modulation data (Ro, Go, Bo, Wo), the image quality of the image can be improved.

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

The liquid crystal display and the driving method thereof according to the first exemplary embodiment of the present invention generate white data using the minimum gray value of the input image data.

The liquid crystal display according to the second exemplary embodiment of the present invention and a driving method thereof generate white data using luminance data of input image data.

The operation speed can be increased by including a plurality of look-up tables capable of outputting modulation data corresponding to the image data of four colors generated by the methods described in the first and second embodiments. In addition, since the data according to the best experimental value can be set as the modulation data, the image quality of the image expressed on the liquid crystal panel can be improved.

Claims (10)

A data conversion unit generating white data using three colors of image data input from the outside, and converting and outputting the modulation data of four colors using the white data and the three colors of image data, and A data driver for converting the modulated data of the four colors into an analog signal and supplying the same to the liquid crystal panel; The data conversion unit A data amplifier for amplifying the three-color image data with a gain value input from the outside; A white data extracting unit extracting white data using image data of three colors amplified by the data amplifying unit; A first lookup table for correcting a luminance value by using the extracted white data to implement white data; A second lookup table for correcting luminance values according to the red image data and shifting color coordinates and color temperature of the image to implement red image data; A third lookup table for correcting a luminance value according to the green image data and correcting an overflow of the luminance value due to the addition of the white data to implement green image data; and And a fourth look-up table for correcting luminance values and shifting color coordinates and color temperatures according to the blue image data to implement blue image data. delete The method of claim 1, The first, second, third, and fourth lookup tables, A liquid crystal display device and a driving device thereof, characterized in that image data of four colors are set according to an experimental value for correcting a luminance value. The method of claim 1, The data driver includes: A shift register for sequentially generating shift signals, A latch unit for latching and outputting the modulated data of the four colors by one line; A gamma voltage generator which generates and outputs a positive gamma voltage and a negative gamma voltage in a diagonal form (primary curve) between a maximum gray value and a minimum gray value centered on a common voltage; And a digital-analog converter for selecting and converting the gamma voltage generated by the gamma voltage generation unit into an analog signal according to the four-color modulation data output from the latch unit. Devices and their drives. Extracting luminance data of three-color image data input from the outside, generating white data using the luminance data, and converting the three-color image data including the white data into four-color modulation data and outputting the same. A data converter, and It is equipped with a data driver for converting the modulation data of the four colors into an analog signal to supply to the liquid crystal panel, The data conversion unit A luminance / color difference separator for separating the input three-color image data into luminance data and color difference data; A delay unit for delaying the color difference data; A luminance amplifier for amplifying the luminance data with a gain value input from an external device, A mixing unit which generates amplified image data by mixing delayed color difference data and amplified luminance data; A first lookup table for correcting a luminance value using the white data to implement white data; A second lookup table for correcting a luminance value according to the red image data and shifting a color coordinate and a color temperature of the image to implement red image data; A third lookup table for correcting a luminance value according to the green image data among the amplified image data to implement green image data, and correcting an overflow of the luminance value due to the addition of the white data; And a fourth lookup table configured to correct luminance values according to the blue image data among the amplified image data and to shift color coordinates and color temperature to implement blue image data. . delete 6. The method of claim 5, The first, second, third, and fourth lookup tables, A liquid crystal display device and a driving device thereof, characterized in that image data of four colors are set according to an experimental value for correcting a luminance value. 6. The method of claim 5, The data driver includes: A shift register for sequentially generating shift signals, A latch unit for latching and outputting the modulated data of the four colors by one line; A gamma voltage generator for generating and outputting a positive gamma voltage and a negative gamma voltage in a diagonal form (primary curve) between a maximum gray value and a minimum gray value centered on a common voltage; And a digital-to-analog converter for selecting a gamma voltage generated by the gamma voltage generator and converting the analog signal into an analog signal according to the four-color modulation data output from the latch unit. Its drive. Inputting image data of three colors; Amplifying the image data of the three colors with a gain value from the outside; Comparing gradation values between the amplified three-color image data and setting the minimum value as white data; Generating white data modulated according to the white data using a lookup table; Generating red image data modulated according to red image data among the three color image data using a lookup table; Generating green image data modulated according to the green image data among the three color image data using a lookup table; And generating blue image data modulated according to blue image data among the three color image data using a lookup table. Separating luminance and chrominance of the three-color image data; Delaying the color difference data; Amplifying the luminance data by using an externally input gain value, and setting the amplified luminance value as white data; Generating amplified image data by mixing delayed color difference data and amplified luminance data; Generating white data modulated according to the amplified white data using a lookup table; Generating red image data modulated according to red image data among the amplified image data using a lookup table; Generating green image data modulated according to the green image data among the amplified image data using a lookup table; And generating blue image data modulated according to the blue image data among the amplified image data by using a lookup table.

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