KR100684832B1 - A liquid crystal display and a driving method thereof - Google Patents

Abstract

The present invention relates to a liquid crystal display of a field sequential driving method for applying one reset pulse in one frame unit consisting of red (R), green (G), and blue (B) fields, and a driving method thereof. The driving method of the liquid crystal display according to the present invention includes a liquid crystal formed between the first and second substrates, and sequentially emits light of red (R), green (G), and blue (B) to one pixel. A method of driving a liquid crystal display device, the method comprising: a) applying a first gray voltage corresponding to a first gray code stored in a first lookup table to a first pixel; b) storing the first gradation code in a second lookup table; c) applying a reset voltage to the first pixel to initialize the liquid crystal state of the first pixel to a specific state; And d) applying a second gray voltage corresponding to the second gray code by referring to the second lookup table, wherein step c) includes red (R), green (G), and blue (B) fields. It is characterized in that to apply one reset pulse in one frame unit having a. According to the present invention, by applying one reset pulse to one frame to initialize the state of the liquid crystal on a frame basis, the cumulative error can be minimized. Also, by increasing the reset pulse application time of the liquid crystal display device, the gray scale of the FS-LCD is increased. Improve your expressive skills.

LCD, reset, reset pulse, gradation code, lookup table, field sequential driving

Description

Liquid Crystal Display and Driving Method {A LIQUID CRYSTAL DISPLAY AND A DRIVING METHOD THEREOF}

1A is a diagram illustrating a pixel of a conventional liquid crystal display.

1B is a waveform diagram illustrating a driving method of a conventional analog liquid crystal display device.

1C is a waveform diagram illustrating a driving method of a conventional digital liquid crystal display device.

2 is a diagram illustrating a reset driving method of a liquid crystal display according to the related art.

3A illustrates a reset pulse of a conventional liquid crystal display.

FIG. 3B is a diagram illustrating that an error accumulates in the reset pulse of FIG. 3A.

4 illustrates a reset pulse of the liquid crystal display according to the exemplary embodiment of the present invention.

5 is a view illustrating a reset driving method of a liquid crystal display according to an exemplary embodiment of the present invention.

6 is a configuration diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 7 is a diagram illustrating a previous gradation, a current gradation, and a relative value thereof stored in a lookup table (LUT) of a liquid crystal display 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 and a driving method thereof. More specifically, the present invention relates to a field sequential driving for applying one reset pulse in one frame unit consisting of red (R), green (G), and blue (B) fields. The present invention relates to a liquid crystal display device and a driving method thereof.

Recently, display devices are also required to be lighter and thinner in accordance with the light weight and thickness of personal computers and televisions, and according to such demands, liquid crystal displays (hereinafter referred to as "LCDs") instead of cathode ray tubes (CRTs) are required. Flat panel displays are being developed.

The LCD applies an electric field to a liquid crystal material having an anisotropic dielectric constant injected between two substrates, and adjusts the intensity of the electric field to transmit the amount of light transmitted from the external light source (back-light) to the substrate. By adjusting the desired image is obtained.

Such LCDs are typical of portable flat panel displays, and among them, TFT-LCDs using thin film transistors (hereinafter referred to as TFTs) as switching elements are mainly used.

Therefore, in the TFT-LCD, each pixel may be modeled as a liquid crystal capacitor because electrodes (pixel electrodes and common electrodes) are disposed to face each other with a liquid crystal interposed therebetween. In such LCDs, each pixel may be equivalent to that of FIG. 1A. May be represented as a circuit.

As shown in Fig. 1A, each pixel of the liquid crystal display according to the prior art includes: a TFT 10 having a source electrode connected to the data line Dm and a gate electrode connected to the scan line Sn; A liquid crystal capacitor Cl connected between the drain electrode of the TFT 10 and a common electrode (not shown); And a storage capacitor Cst connected to the drain electrode of the TFT 10.

The TFT 10 provides the pixel electrode (not shown) with the data voltage Vd supplied from the data line Dm in response to the scan signal from the scan line Sn. The electric field corresponding to the difference between the data voltage provided to the pixel electrode (that is, the pixel voltage Vp and the common voltage Vcom applied to the common electrode) is liquid crystal (equivalently represented by the liquid crystal capacitor Cl in FIG. 1). In this case, the liquid crystal adjusts the transmittance of light according to the intensity of the applied electric field, and the storage capacitor Cst uses the pixel voltage provided to the liquid crystal capacitor Cl when the next data voltage Vd is supplied. By keeping it until the light is transmitted for a predetermined time.

In general, the LCD may be divided into two methods, a color filter method and a field sequential driving method, according to a method of displaying a color image.

A color filter type LCD forms a color filter layer consisting of three primary colors of red (R), green (G), and blue (B) on an upper substrate of a panel, and adjusts the amount of light transmitted through the color filter layer, thereby controlling a desired image. Is displayed. However, the color filter type LCD requires unit pixels corresponding to the red (R), green (G), and blue (B) areas, and thus requires three times as many pixels as those for displaying black and white. Therefore, in order to obtain high resolution images, sophisticated manufacturing techniques for LCD panels are required. In addition, in the color filter type LCD, red (R), green (G), and blue (B) color filters must be formed on the upper substrate, which is cumbersome in manufacturing, and the light transmittance of the color filter itself must be improved. There is a problem.

In addition, the LCD of the field sequential driving method periodically turns on independent light sources of red (R), green (G), and blue (B) colors sequentially, and supplies the pixel voltage Vp to each pixel at each lighting cycle. Displays a color image. That is, the field-sequential driving LCD does not divide one pixel into unit pixels of red (R), green (G), and blue (B), and red (R), green (G), and blue in one pixel. (B) Color images are displayed by using the afterimage effect of the eye by time-divisionally displaying the light of the three primary colors supplied from the respective backlights.

The field sequential driving method may be classified into an analog driving method and a digital driving method.

The analog driving method sets a plurality of gray voltages corresponding to the number of gray scales to be displayed, selects one gray voltage corresponding to the gray scale code among the gray voltages, and drives the liquid crystal panel with the selected gray voltage, thereby applying the applied gray voltage. The gradation is expressed by the amount of transmitted light corresponding to.

In addition, the digital driving method makes the driving voltage applied to the liquid crystal constant and expresses the gray scale by controlling the voltage application time. According to such a digital driving method, gray scales are displayed by controlling the accumulated amount of light transmitted through the liquid crystal by keeping the driving voltage constant and controlling the voltage applied state and the voltage unapplied state in a timely manner.

FIG. 1B is a diagram illustrating a driving voltage and a transmitted light amount according to a conventional LCD driving apparatus.

In FIG. 1B, a driving voltage means a voltage applied to the liquid crystal, and optical transmittance means a transmission ratio with respect to the applied light when light is applied to the liquid crystal. That is, the light transmittance refers to the degree of twist that the liquid crystal can transmit light.

Referring to FIG. 1B, in the R field period Tr for displaying the R color, a driving voltage of the V11 level is applied to the liquid crystal so that light corresponding to the driving voltage of the V11 level passes through the liquid crystal. In the G field section Tg for displaying the G color, a driving voltage of the V12 level is applied, so that light corresponding to the driving voltage of the V12 level passes through the liquid crystal. Then, in the B field section Tb for displaying the B color, a driving voltage of the V13 level is applied to obtain a light transmittance corresponding to the driving voltage of the V13 level. The desired color image is displayed by the sum of the R, G, and B lights transmitted in the Tr, Tg, and Tb sections, respectively.

On the other hand, in the digital driving method, the driving voltage applied to the liquid crystal is made constant, and the gray scale is expressed by controlling the voltage application time. According to such a digital driving method, gray scales are represented by adjusting a cumulative amount of light transmitted through a liquid crystal by maintaining a constant driving voltage and controlling a voltage application state and a voltage non-application state in a timing manner.

FIG. 1C is a waveform diagram illustrating a conventional method for driving a liquid crystal display of a digital driving method, and illustrates a waveform of a driving voltage according to driving data of a predetermined bit and a light transmittance of the liquid crystal accordingly.

Referring to FIG. 1C, grayscale waveform data corresponding to each grayscale is provided as a digital signal of a predetermined bit, for example, 7bit, and a grayscale waveform corresponding to the 7bit data is applied to the liquid crystal. The light transmittance of the liquid crystal is determined according to the applied gray waveform to perform gray scale display.

On the other hand, according to the conventional field sequential driving method, since the effective value response varies according to the gradation (for example, the gradation of G) immediately before the gradation (for example, the gradation of R) to be displayed, the gradation display accurately. There was a problem that can not. That is, the pixel voltage Vp actually supplied to the current liquid crystal is not only the gradation voltage (or gradation waveform) supplied to the current field (for example, the R field) but also the gradation supplied to the immediately preceding field (for example, the B field). It is also determined by the voltage (or gradation waveform).

As described above, in order to solve the problem of the field sequential driving method in which the effective value response varies according to the gradation displayed immediately before, a field sequential driving method using a reset pulse is disclosed in US Pat. No. 6,567,063.

2 is a view showing a field sequential driving method using a reset pulse shown in the US patent. In Fig. 2, the sections T31 to T26 represent the R field, G field, and B field sections in which gradation display for R, G, and B is performed.

Referring to Fig. 2, a predetermined voltage (reset) that is independent of the input grayscale code for a predetermined time (t31 to t36) at a time point at which each section T31 to T36 ends, is larger than the maximum value of the grayscale code. Voltage) is applied. By applying such a reset voltage, at the end of each section T31 to T36, the liquid crystal states are all initialized to the same state (for example, a black state that does not transmit light, that is, a state where the light transmittance is 0). do.

Therefore, when the liquid crystal is driven by the applied voltage according to the gradation code in each section T31 to T36, the state of the liquid crystal is the same regardless of the previously displayed gradation, so that the previously displayed gradation is displayed as the current gradation. It does not affect the section.

However, according to the above-described US patent, there is a problem in that power consumption increases because a reset voltage having a constant magnitude and a constant width larger than the maximum value of the gradation code is always applied regardless of the input gradation code.

3A is a diagram illustrating a reset pulse of a conventional liquid crystal display, and FIG. 3B is a diagram showing that an error accumulates in the reset pulse of FIG. 3A.

Referring to FIG. 3A, the conventional FS-LCD driving method represents a gray level by applying a reset pulse at the beginning of each field of red (R), green (G), and blue (B), wherein the reset pulse It is for accurately expressing a specific gradation corresponding to each gradation code by initializing the liquid crystal state by the gradation code.

Referring to FIG. 3B, in the conventional FS-LCD, as the resolution increases, the width of the reset pulse decreases, so that the time for which the reset pulse is applied is shortened, and the liquid crystal cannot be sufficiently initialized. In other words, when a gray scale code is applied to express a specific gray scale, a gray scale code applied immediately before the gray scale code affects the current gray scale code. Thus, the gray scale ability of the FS-LCD is significantly degraded.

An object of the present invention for solving the above problems is to increase the reset pulse application time of the liquid crystal display device, thereby fully initialize the state of the liquid crystal, thereby improving the gradation expression capability of the FS-LCD. It is to provide a liquid crystal display device and a driving method thereof.

In addition, another object of the present invention is to apply a single reset pulse to one frame of the liquid crystal display device to initialize the state of the liquid crystal by frame unit to minimize the cumulative error of the liquid crystal display device and driving method thereof It is to provide.

As a means for achieving the above object, the driving method of the liquid crystal display device according to the present invention,

In the driving method of the liquid crystal display device comprising a liquid crystal formed between the first and second substrate, and sequentially transmits the light of red (R), green (G), blue (B) to one pixel,

a) applying a first gray voltage corresponding to the first gray code stored in the first lookup table to the first pixel;

b) storing the first gradation code in a second lookup table;

c) applying a reset voltage to the first pixel to initialize the liquid crystal state of the first pixel to a specific state; And

d) applying a second gray voltage corresponding to a second gray code by referring to the second lookup table;

There is a feature that includes.

In addition, as another means for achieving the above object, the driving method of the liquid crystal display device according to the present invention,

A plurality of scan lines, a plurality of data lines insulated from and intersecting the scan lines, a plurality of data lines arranged in a matrix form having a switching element connected to the scan lines and the data lines, respectively; A driving method of a liquid crystal display device comprising a pixel and sequentially transmitting red, green, and blue light to one of the plurality of pixels.

The driving method includes a red field, a blue field, and a green field for driving light of red, blue, and green, respectively.

The field of any one of the red field, green field and blue field,

A reset period for sequentially driving the scan lines to apply a reset voltage or a reset waveform to the gray level code applied to the immediately preceding field; And

And a data application section for sequentially driving the scan lines to apply a gray voltage or a gray waveform corresponding to a current gray code.

The other two fields of the red field, the green field and the blue field,

A data application section for sequentially driving the scan lines to apply a gray voltage or a gray waveform corresponding to a current gray code;

There is a feature that includes.

In addition, as another means for achieving the above object, the liquid crystal display device according to the present invention,

A matrix form having a plurality of scan lines for transmitting a scan signal, a plurality of data lines insulated from and intersecting the scan lines, a switching element formed in an area surrounded by the scan lines and data lines, and connected to the scan lines and data lines, respectively. A liquid crystal display panel including a plurality of pixels arranged in a line;

A scan driver for sequentially supplying scan signals to the scan lines;

Gradation voltages corresponding to the first and second gray level codes stored in the first lookup table, and gray level voltages corresponding to the relative values of the first and second gray level codes stored in the second lookup table. A voltage generator;

A reset voltage providing unit generating a reset voltage corresponding to the first gray voltage applied to the immediately preceding pixel;

A data driver configured to supply the gray voltage and the reset voltage output from the gray voltage generator and the reset voltage provider to a corresponding data line; And

Light source that sequentially outputs red (R), green (G), and blue (b) light to one pixel

There is a feature that includes.

According to the present invention, since the reset pulse application time is increased by about three times as compared with the conventional FS-LCD driving method, it is possible to sufficiently initialize the state of the liquid crystal, thereby greatly improving the gray scale display capability of the FS-LCD.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

The term 'current pixel' described below refers to a pixel at the current point in time t unless otherwise specified, and the term 'previous pixel' refers to a pixel at the immediately preceding point in time t-1. And, "reset" means applying a voltage (or waveform) in order to make the liquid crystal material in the LCD into a black state that does not transmit light. In addition, the 'gradation voltage' and the 'reset voltage' mean voltages having different voltage levels, and the 'gradation waveform' and 'reset waveform' mean waveforms having different sizes of on voltage width and off voltage width. . In addition, "light transmittance" refers to a ratio of transmitted light to applied light when a certain light is applied to the liquid crystal, and 'light transmittance' is the amount of light transmitted through the liquid crystal by the actual light is applied to the liquid crystal. Means.

4 illustrates a reset pulse of the liquid crystal display according to the exemplary embodiment of the present invention.

Referring to FIG. 4, the reset pulse of the liquid crystal display according to the exemplary embodiment of the present invention applies a reset pulse only once per frame, thereby providing a sufficient reset period. For example, when a reset pulse is applied to the red (R) field, since there is no reset in the green (G) and blue (B) fields, the values corresponding to the previous gray level and the current gray level are read from the lookup table (LUT). . However, it is not preferable to implement the LUT completely without the reset pulse because an error exists and may be a problem when accumulating, and the gradation code should be reset at a predetermined period.

Therefore, when the reset pulse is applied only once in one frame, the reset pulse application time can be increased by about three times as compared with the conventional method, thereby improving the gray scale display capability of the FS-LCD.

5 is a diagram illustrating a reset driving method according to an exemplary embodiment of the present invention.

As shown in FIG. 5, in accordance with an embodiment of the present invention, the R field, the G field, and the B field for displaying light corresponding to R, G, and B are reset periods (Rreset, Greset, Breset) and a data period, respectively. It consists of (Rdata, Gdata, Bdata).

The reset sections are sections in which a reset voltage (or a reset waveform) is applied in order to make the liquid crystals of the gray level displayed immediately before the same state (black state). In the reset periods (Rreset, Greset, Breset) according to the embodiment of the present invention, reset voltages (or reset waveforms) corresponding to the immediately preceding gradation codes are sequentially applied to the scan lines S1, S2, ... Sn, as described later. The liquid crystals are in the same state irrespective of the previous gray level, but one reset pulse is applied in one frame unit having red (R), green (G), and blue (B) fields.

The data section (Rdata, Gdata, Bdata) is a section for applying the gray scale voltage (or gray waveform) corresponding to the currently displayed gray scale, and sequentially turns on the backlight for outputting light corresponding to R, G, and B in this data section. Turn on In the exemplary embodiment of the present invention, the light emitting diode is described as an example of the backlight, but is not necessarily limited thereto.

In the conventional method, the gradation code represents an absolute value, but the gradation code according to an embodiment of the present invention represents a relative value with respect to the previous gradation code, and thus, a look up table for the immediately preceding gradation code and the current gradation code. LUT) can be used. That is, in the conventional method of FIG. 3B, the gradation code represents an absolute value and is stored in the first lookup table. However, as shown in FIG. 5, in the embodiment of the present invention, the gradation code is a relative value with respect to the previous gradation code. As a result, the second lookup table is stored.

6 is a diagram illustrating a liquid crystal display for applying a reset voltage according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the liquid crystal display according to the exemplary embodiment of the present invention includes a liquid crystal display panel 100, a scan driver 300, a data driver 400, a gray voltage generator 500, and a timing controller 600. Light emitting diodes 800a, 800b, and 800c, light source controllers 700, and a reset voltage providing unit 900 for outputting R, G, and B light sources, respectively. And a first and second lookup table.

A plurality of scan lines (not shown) are formed in the liquid crystal display panel 100 to transmit a gate-on signal, and are insulated from and intersect with the plurality of scan lines to reset the gray level code voltages and resets corresponding to the gray level codes. Data lines (not shown) for transmitting voltages are formed. A plurality of pixels arranged in a matrix form is surrounded by a scan line and a data line, and each pixel includes a thin film transistor (not shown) and a drain electrode of the thin film transistor, in which a gate electrode and a source electrode are connected to the scan line and the data line, respectively. A pixel capacitor (not shown) and a storage capacitor (not shown) are connected to each other.

The scan driver 300 sequentially applies a scan signal to the scan line, thereby turning on the TFT to which the gate electrode is connected to the scan line to which the scan signal is applied. In this case, according to the exemplary embodiment of the present invention, in order to eliminate the influence of the data voltage applied to the immediately preceding pixel, the scan driver first sequentially applies a scan signal for applying the reset voltage to the plurality of scan lines, and then applies the data voltage. Scan signals to be sequentially applied to a plurality of scan lines.

The timing controller 600 receives gradation code signals R, G, and B data, a horizontal sync signal Hsync, and a vertical sync signal Vsync from an external or graphic controller (not shown), and controls necessary signals Sg, Sd and Sb are respectively supplied to the scan driver 200, the data driver 400, and the light source controller 700, and the gray level codes R, G, and B DATA are supplied to the gray voltage generator 500 and the reset voltage providing unit ( 900).

The gray voltage generator 500 generates a gray voltage having a magnitude corresponding to the gray code and supplies it to the data driver 400. In detail, the gray voltage generator 500 may include a gray voltage corresponding to the first and second gray codes previously stored in a first lookup table, and the first gray codes and the second gray codes stored in the second lookup table 1000. The gray scale voltage corresponding to the relative value of the gray scale code is generated. In this case, the absolute value of the entire gradation code is prestored in the first lookup table used in the related art, while the second lookup table 1000 includes the previous gradation code and the current gradation code according to an embodiment of the present invention. The gradation code and the relative value of the preceding gradation code and the current gradation code are stored. Here, the relative value may be, for example, a value obtained by subtracting the previous gray level code value from the current gray level code value.

The reset voltage providing unit 900 selects a reset voltage corresponding to the gray scale voltage applied to the immediately preceding pixel and supplies the selected voltage to the data driver 400.

The data driver 400 applies the gray voltage output by the gray voltage generator 500 or the reset voltage output by the reset voltage providing unit 900 to the data line.

The light emitting diodes 800a, 800b, and 800c respectively output light corresponding to R, G, and B to the LCD panel, and the light source controller 700 controls the lighting timing of the light emitting diodes 800a, 800b, and 800c. In this case, according to an exemplary embodiment of the present invention, the timing controller 600 includes a timing point of supplying a corresponding gray level code from the data driver 400 to the data line and a time point of lighting the R, G, and B light emitting diodes by the light source controller 700. It can be synchronized by the control signal provided by.

The light source controller 700 may emit the light sources 800R, the green light sources 800R, the blue light sources 800G, and the blue light sources 800B in different periods of one frame in response to the light source control signal Sb. 800G, 800B). In this case, driving currents I _R , I _G , and I _B expressing color are supplied to the light sources 800R, 800G, and 800B.

As described above, according to the exemplary embodiment of the present invention, the reset voltage providing unit 900 generates the reset voltage according to the data voltage applied to the immediately preceding pixel, and the data driver 400 outputs the previous grayscale output from the reset voltage providing unit 900. A reset voltage corresponding to the code is applied to the data line.

FIG. 7 is a diagram illustrating a previous gradation, a current gradation, and a relative value thereof stored in a lookup table (LUT) of a liquid crystal display according to an exemplary embodiment of the present invention. The second lookup table 1000 illustrated in FIG. 6 is illustrated. ).

Referring to FIG. 7, in the reset pulse applying method according to an exemplary embodiment of the present invention, an absolute value of all gray codes is pre-stored in the first lookup table, and the second lookup table 1000 is a previous gray level code. , A current gradation code, and a relative value of the previous gradation code and the current gradation code are stored. In this case, the second lookup table 100 stores a relative value of the previous gradation code and the current gradation code for at least two fields of the red (R), green (G), and blue (B) fields.

Therefore, as described above, after setting the gradation code as a relative value to the previous gradation code, one reset pulse is applied to one frame, whereby the state of the liquid crystal can be initialized in units of frames.

As a result, in the embodiment of the present invention, since one reset pulse is applied to one frame in order to solve the problem that the time for which the reset pulse is applied is shortened and the gray scale expression ability is lowered, the reset pulse is reset compared to the conventional FS-LCD driving method. The pulse application time increases by about three times, and the state of the liquid crystal can be sufficiently initialized.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

For example, in the above-described embodiment of the present invention, the LCD of the field sequential driving method has been described as an example, but may be applied to various LCDs other than the field sequential driving LCD.

According to the present invention, by applying one reset pulse to one frame of the liquid crystal display to initialize the state of the liquid crystal on a frame-by-frame basis, the cumulative error can be minimized. Also, by increasing the reset pulse application time of the liquid crystal display, It is possible to sufficiently initialize the state of, thereby improving the gradation expression capability of the FS-LCD.

Claims (17)

In the driving method of the liquid crystal display device comprising a liquid crystal formed between the first and second substrate, and sequentially transmits the light of red (R), green (G), blue (B) to one pixel, Consecutive red (R), green (G) and blue (B) fields are one frame unit, and one frame unit is a) applying a reset voltage to the first pixel to initialize the liquid crystal state of the first pixel to a state where the light transmittance is zero; b) obtaining, from a first lookup table, a first gray level code corresponding to a first color field among the three color fields and applying a first gray voltage corresponding to the first gray code to the first pixel; c) obtaining a second grayscale code corresponding to a second color field from the second lookup table and applying a second grayscale voltage corresponding to the second grayscale code to the first pixel; d) obtaining a third grayscale code corresponding to a third color field from the second lookup table and applying a third grayscale voltage corresponding to the third grayscale code to the first pixel, The first lookup table may store an absolute value of all gray codes, and the second lookup table may store a previous gray level code, a current gray level code, and a relative value of the previous gray level code and the current gray level code. Driving method of liquid crystal display device. delete delete delete delete The method of claim 1, The first gradation code is an absolute gradation code, the second gradation code is a relative value with respect to the first gradation code, and the third gradation code is a relative value with respect to the second gradation code. Driving method. delete The method according to claim 1 or 6, And the second lookup table stores relative values of the previous gradation code and the current gradation code for at least a second color field and a third color field. A plurality of scan lines, a plurality of data lines insulated from and intersecting the scan lines, a plurality of data lines arranged in a matrix form having a switching element connected to the scan lines and the data lines, respectively; A driving method of a liquid crystal display device comprising a pixel and sequentially transmitting red, green, and blue light to one of the plurality of pixels. The driving method includes a red field, a blue field, and a green field for driving light of red, blue, and green, respectively. The field of any one of the red field, green field and blue field, A reset period for sequentially driving the scan lines to apply a reset voltage or a reset waveform to the gray level code applied to the immediately preceding field; And And a data application section for sequentially driving the scan lines to apply a gray voltage or a gray waveform corresponding to a current gray code. The other two fields of the red field, the green field and the blue field, And a data application section for sequentially driving the scan lines to apply a gradation voltage or a gradation waveform corresponding to a current gradation code. The method of claim 9, During the reset period, one reset pulse is generated in one frame unit including a red (R), green (G), and blue (B) field among the red (R), green (G), and blue (B) fields. A method for driving a liquid crystal display, characterized in that applied to any one field. The method of claim 9, And two other fields of the red field, the green field, and the blue field apply a relative value of a previous gradation code and a current gradation code to the data application section. A matrix form having a plurality of scan lines for transmitting a scan signal, a plurality of data lines insulated from and intersecting the scan lines, a switching element formed in an area surrounded by the scan lines and data lines, and connected to the scan lines and data lines, respectively. A liquid crystal display panel including a plurality of pixels arranged in a line; A scan driver for sequentially supplying scan signals to the scan lines; Gradation voltages corresponding to the first and second gray level codes stored in the first lookup table, and gray level voltages corresponding to the relative values of the first and second gray level codes stored in the second lookup table. A voltage generator; A reset voltage providing unit generating a reset voltage corresponding to the first gray voltage applied to the immediately preceding pixel; A data driver configured to supply the gray voltage and the reset voltage output from the gray voltage generator and the reset voltage provider to a corresponding data line; And Including a light source to sequentially output the light of red (R), green (G) and blue (b) to one pixel, The reset voltage providing unit applies one reset pulse in one frame unit having red (R), green (G), and blue (B) fields. delete delete The method of claim 12, And the gray voltage generator is configured to store the second gray code, which is a value relative to the first gray code, in the second lookup table when the second gray voltage is applied. The method of claim 12, The first lookup table may store an absolute value of all gray codes, and the second lookup table may store a previous gray code, a current gray code, and a relative value of the previous gray code and the current gray code. Liquid crystal display device. The method of claim 16, And wherein the second lookup table stores a relative value of the previous gradation code and the current gradation code for at least two fields of red (R), green (G), and blue (B) fields.

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