KR20080092709A - Lcd and drive method thereof - Google Patents

Abstract

An LCD device and a driving method thereof are provided to increase a response speed of the LCD device without using a high speed memory by sequentially supplying precharge data and actual data during a single frame driving period. An LCD(Liquid Crystal Display) device(100) includes an LCD panel(110), a data driver(120), and a gate driver(130). Plural parallel lines are formed on the LCD panel. The data driver supplies precharge and actual data to the parallel lines one by one. The gate driver sequentially supplies precharge and actual scan pulses to the parallel lines. The data driver sequentially supplies the precharge and actual data of the same polarities to the respective parallel lines on the LCD panel. The gate driver sequentially supplies the precharge and actual scan pulses to the respective parallel lines.

Description

Liquid crystal display and driving method thereof

1 is an equivalent circuit diagram of each pixel formed in a general liquid crystal display device.

2 is a waveform diagram illustrating a change in luminance according to data of a general liquid crystal display device;

3 is a waveform diagram showing an example of a luminance change caused by data modulation by a high speed driving method of a conventional liquid crystal display device.

4 is a block diagram of a liquid crystal display according to an embodiment of the present invention.

5 is a signal characteristic diagram of a liquid crystal display according to the present invention shown in FIG.

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

7 is a signal characteristic diagram of a liquid crystal display according to the present invention shown in FIG.

8 is a characteristic diagram showing the response characteristics of the liquid crystal by the liquid crystal display device according to the present invention.

Explanation of symbols on the main parts of the drawings

100 and 200: liquid crystal display 110: liquid crystal display panel

120, 210: data driver 130, 220: gate driver

140: gamma reference voltage generator 150: backlight assembly

160: inverter 170: common voltage generator

180: gate driving voltage generation unit 190, 230: timing controller

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 capable of significantly improving the response speed of a liquid crystal without using a memory used for high speed driving of the liquid crystal display device.

A liquid crystal display device displays an image by adjusting light transmittance of liquid crystal cells according to a video signal, and an active matrix type liquid crystal display device in which a switching element is formed for each liquid crystal cell enables active control of the switching element. This is advantageous for video implementation. As the switching element used in the active matrix liquid crystal display device, a thin film transistor (hereinafter referred to as TFT) is mainly used as shown in FIG. 1.

Referring to FIG. 1, an active matrix type liquid crystal display converts digital input data into an analog data voltage based on a gamma reference voltage and supplies it to the data line DL and simultaneously supplies scan pulses to the gate line GL. The liquid crystal cell Clc is charged.

The gate electrode of the TFT is connected to the gate line GL, the source electrode is connected to the data line DL, and the drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell Clc and one electrode of the storage capacitor Cst. Connected.

The common voltage Vcom is supplied to the common electrode of the liquid crystal cell Clc.

The storage capacitor Cst charges a data voltage applied from the data line DL when the TFT is turned on, thereby maintaining a constant voltage of the liquid crystal cell Clc.

When the scan pulse is applied to the gate line GL, the TFT is turned on to form a channel between the source electrode and the drain electrode so that the voltage on the data line DL is applied to the pixel electrode of the liquid crystal cell Clc. Supply. At this time, the liquid crystal molecules of the liquid crystal cell Clc modulate the incident light by changing the arrangement by the electric field between the pixel electrode and the common electrode.

A general liquid crystal display device having pixels having such a circuit structure can be seen in Equation 1 and Equation 2 below, and has a disadvantage in that response speed is slow due to inherent viscosity and elasticity of the liquid crystal.

(gamma)는 액정분자의 회전점도(rotational viscosity)를 각각 의미한다. Where τ _r is the rising time when voltage is applied to the liquid crystal, Va is the applied voltage, and V _F is the Freederick Transition Voltage at which the liquid crystal molecules begin their inclined motion, d Is the cell gap of the liquid crystal cell,

(gamma) means rotational viscosity of liquid crystal molecules, respectively.

Here, τ _f denotes a falling time during which the liquid crystal is restored to its original position by the elastic restoring force after the voltage applied to the liquid crystal is turned off, and K denotes the elastic modulus inherent to the liquid crystal.

The response time of the liquid crystal in TN (Twisted Negmatic) mode may vary depending on the physical properties of the liquid crystal material and the cell gap. However, the rising time is 20-80 ms and the polling time is 20-30 ms. Since the response speed of the liquid crystal is longer than one frame period of the video (NTSC: 16.67 ms), the screen is blurred in the video because the voltage charged in the liquid crystal cell proceeds to the next frame as shown in FIG. 2. The motion blurring phenomenon appears.

Referring to FIG. 2, in a typical LCD, when a data VD changes from one level to another level due to a slow response speed in a moving image, the corresponding display luminance BL does not reach a desired luminance. Can not express the brightness. As a result, the motion blurring phenomenon occurs in the liquid crystal display, and the display quality is degraded due to the decrease in the contrast ratio.

In order to solve the slow response speed of the liquid crystal display device, U.S. Patent No. 5,495,265 and PCT International Publication No. WO 99/09967 use a lookup table to modulate the data according to the change of data (hereinafter, 'high speed driving Has been proposed. This high speed drive method modulates data on the same principle as in FIG. 3.

을 크게 하게 된다. 따라서, 종래의 고속구동 방법이 적용된 종래의 액정표시장치는 액정의 늦은 응답속도를 데이터값의 변조로 보상하여 동화상에서 모션 블러링(Motion Burring) 현상을 완화시킴으로써 원하는 색과 휘도로 화상을 표시할 수 있게 된다.Referring to FIG. 3, the high speed driving method of the conventional liquid crystal display device modulates the input data VD and applies the modulation data MVD to the liquid crystal cell to obtain a desired luminance MBL. The conventional high speed driving method uses Equation 1 based on whether or not the data is changed so as to obtain a desired luminance corresponding to the luminance value of the input data within one frame period.

To make it larger. Therefore, the conventional liquid crystal display device to which the conventional high speed driving method is applied compensates for the late response speed of the liquid crystal by modulating the data value, thereby alleviating the motion blurring phenomenon in the moving image, thereby displaying an image with a desired color and luminance. It becomes possible.

In other words, the conventional high-speed driving method of the liquid crystal display device compares the most significant bit data MSB of each of the previous frame Fn-1 and the current frame Fn, and if there is a change between the most significant bit data MSB, the lookup table Select the modulated data (Mdata) in the modulation.

As described above, the conventional liquid crystal display device to which the high speed driving method is applied compares the data of the previous frame Fn-1 and the current frame Fn and generates a lookup table to generate modulation data MRGB according to the comparison result. Since it is necessary to have a memory, such as not only increases the manufacturing cost but also has a problem that the chip size increases.

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and an object of the present invention is to provide a liquid crystal display device and a driving device capable of sequentially supplying precharge data and actual data of the same polarity to each pixel during one frame driving period. To provide a way.

Another object of the present invention is to sequentially supply the precharge data and the actual data of the same polarity to each pixel during one frame driving period, thereby significantly reducing the response speed of the liquid crystal without using a memory used for high speed driving of the liquid crystal display device. There is provided a liquid crystal display device and a driving method thereof which can be improved.

Another object of the present invention is to improve the response speed of a liquid crystal without using a memory used for high speed driving of the liquid crystal display device, thereby reducing the cost required for high speed driving and a liquid crystal display device and a driving method thereof. To provide.

According to an aspect of the present invention, a liquid crystal display device includes: a liquid crystal display panel having a plurality of horizontal lines formed therein; A data driver supplying precharge data and actual data to the horizontal lines in units of one horizontal line; And a gate driver for sequentially supplying precharge scan pulses and actual scan pulses to the horizontal lines, wherein the data driver sequentially supplies precharge data and actual data of the same polarity to each horizontal line of the liquid crystal display panel. And the gate driver sequentially supplies one precharge scan pulse and one actual scan pulse to each horizontal line of the liquid crystal display panel.

According to an embodiment of the present invention, the data driver continuously supplies precharge data to the odd-numbered and even-numbered horizontal lines among adjacent odd-numbered horizontal lines and even-numbered horizontal lines, and then the odd-numbered horizontal lines. And it is characterized in that the real data is continuously supplied to the even-th horizontal line. The gate driver continuously supplies the precharge scan pulses to the odd-numbered and even-numbered horizontal lines of the adjacent odd-numbered horizontal lines and the even-numbered horizontal lines, and then the odd-numbered horizontal lines and the even-numbered horizontal lines. The actual scan pulse is continuously supplied to the horizontal line.

According to another embodiment of the present invention, the data driver sequentially supplies precharge data and actual data to the upper horizontal line among neighboring upper horizontal lines and lower horizontal lines, and then precharge data and actual data to the lower horizontal line. It is characterized by supplying data sequentially. The gate driver continuously supplies the precharge scan pulse and the actual scan pulse to the upper horizontal line among the adjacent upper horizontal line and the lower horizontal line, and then supplies the precharge scan pulse to the lower horizontal line. The actual scan pulse is characterized in that the supply continuously.

According to an exemplary embodiment of the present invention, a method of driving a liquid crystal display includes supplying precharge data and actual data to the horizontal lines in units of one horizontal line; And sequentially supplying precharge scan pulses and actual scan pulses to the horizontal lines. In the data supply step, precharge data and actual data of the same polarity are sequentially applied to each horizontal line of the liquid crystal display panel. In the scanning pulse supply step, one precharge scan pulse and one actual scan pulse are sequentially supplied to each horizontal line of the liquid crystal display panel.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

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

Referring to FIG. 4, in the liquid crystal display device 100 according to an exemplary embodiment, a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn correspond to each other, and cross each other. The precharge data is formed on the liquid crystal display panel 110 having a thin film transistor (TFT) for driving the liquid crystal cell Clc and the data lines DL1 to DLm of the liquid crystal display panel 110. The precharge scan pulse PSP and the actual scan pulse RSP are applied to the data driver 120 for supplying the PData and the actual data RData, and the gate lines GL1 to GLn of the liquid crystal display panel 110. A gate assembly 130 for supplying, a gamma reference voltage generating unit 140 for generating a gamma reference voltage and supplying it to the data driver 120, and a backlight assembly for irradiating light to the liquid crystal display panel 110 ( 150 and for applying an alternating voltage and current to the backlight assembly 150. The common voltage generator 170, the gate high voltage VGH, and the gate for generating the butter 160, the common voltage Vcom, and supplying the common voltage Vcom to the common electrode of the liquid crystal cell Clc of the liquid crystal display panel 110. A gate driving voltage generator 180 for generating a low voltage VGL and supplying it to the gate driver 130, and a timing controller 190 for controlling the data driver 120 and the gate driver 130. .

In the liquid crystal display panel 110, liquid crystal is dropped between two glass substrates. The data lines DL1 to DLm and the gate lines GL1 to GLn are orthogonal to the lower glass substrate of the liquid crystal display panel 110. TFTs are formed at intersections of the data lines DL1 to DLm and the gate lines GL1 to GLn. The TFT supplies the data on the data lines DL1 to DLm to the liquid crystal cell Clc in response to the scan pulse. The gate electrode of the TFT is connected to the gate lines GL1 to GLn, and the source electrode of the TFT is connected to the data lines DL1 to DLm. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell Clc and the storage capacitor Cst.

The TFT is turned on in response to a scan pulse supplied to the gate terminal via the gate line connected to its gate terminal among the gate lines GL1 to GLn. The video data on the data line connected to the drain terminal of the TFT among the data lines DL1 to DLm at the turn-on of the TFT is supplied to the pixel electrode of the liquid crystal cell Clc.

The data driver 120 supplies data to the data lines DL1 to DLm in response to the data driving control signal DDC supplied from the timing controller 190, and digital video data supplied from the timing controller 190. After sampling and latching the RGB, the liquid crystal cell Clc of the liquid crystal display panel 110 is converted into an analog data voltage capable of expressing gray scale based on the gamma reference voltage supplied from the gamma reference voltage generator 140. Supply to the data lines DL1 to DLm.

The data driver 120 sequentially supplies the precharge data PData and the actual data RData to each horizontal line including one gate line. Here, the data driver 120 supplies the precharge data PData 1/2 After the horizontal period (H / 2) has elapsed, the actual data (RData) is supplied to the same horizontal line. That is, the data driver 120 continuously supplies the precharge data (PData) to the odd-numbered and even-numbered horizontal lines of the adjacent odd-numbered horizontal lines and even-numbered horizontal lines, and then the odd-numbered horizontal lines and the even-numbered horizontal lines. Real data (RData) is continuously supplied to the horizontal line. In particular, even if the data voltages having different polarities are supplied to different horizontal lines according to the data inversion method of the liquid crystal display device 100, the data driver 120 according to the present invention is the same regardless of the data inversion method. The precharge data (PData) and the actual data (RData) of the same polarity are supplied to the horizontal line. Here, one horizontal period 1H is a period during which one horizontal line is driven, and one half horizontal period H / 2 is a period corresponding to half of one horizontal period.

A more detailed operation of the data driver 120 will now be described with reference to FIG. 5.

Looking at the process of supplying the precharge data PData1 and the actual data RData1 to the first horizontal line including the first gate line GL1, the data driver 120 precharges the scan pulse to the first gate line GL1. The precharge scan pulse PSP is supplied to the second horizontal line including the second gate line GL2 after the precharge data PData1 is supplied during the 1/2 horizontal period H / 2 to which the PSP is supplied. After the 1/2 horizontal period H / 2 has elapsed, the actual data RData1 is supplied while the actual scan pulse RSP is supplied to the first horizontal line. Here, the precharge data PData1 and the actual data RData1 have the same polarity.

Referring to a process of supplying the precharge data PData2 and the actual data RData2 to the second horizontal line including the second gate line GL2, the data driver 120 may provide a precharge scan pulse to the second gate line GL2. The precharge scan pulse PSP is supplied to the third horizontal line including the third gate line GL3 after the precharge data PData2 is supplied during the 1/2 horizontal period H / 2 to which the PSP is supplied. After the 1/2 horizontal period (H / 2) has elapsed, the actual data RData2 is supplied while the actual scan pulse RSP is supplied to the second horizontal line. Here, the precharge data PData2 and the actual data RData2 have the same polarity. The data voltages supplied to the first horizontal line and the second horizontal line may be implemented to have the same polarity or different polarities.

The data driver 120 repeatedly performs the supply method of the precharge data PData and the actual data RData, thereby precharging the first horizontal line to the last horizontal line including the nth gate line GLn. Supply data PData and real data RData to each horizontal line. However, the data driver 120 supplies precharge data PData and actual data RData of the same polarity to the same horizontal line.

The gate driver 130 responds to the precharge scan pulse PSP and the actual scan pulse in response to the gate start pulse GSP, the gate shift clock GSC, and the gate output enable GOE supplied from the timing controller 190. RSP are generated sequentially and supplied to the gate lines GL1 to GLn.

The process of supplying the precharge scan pulse PSP and the actual scan pulse RSP by the gate driver 130 will be described in more detail with reference to FIG. 5.

As shown in FIG. 5, the gate driver 130 supplies the precharge scan pulse PSP to the first gate line GL1 positioned in the first horizontal line for 1/2 horizontal period H / 2. After the precharge scan pulse PSP is supplied to the second gate line GL2 positioned in the second horizontal line for 1/2 horizontal period H / 2, the second horizontal line (GL1) is again supplied to the first gate line GL1. H / 2) supplies the actual scan pulse (RSP). Subsequently, the gate driver 130 supplies the actual scan pulse RSP to the second gate line GL2 for 1/2 horizontal period H / 2. In this case, after the precharge data PData1 is supplied to the first horizontal line during the 1/2 horizontal period H / 2 during which the precharge scan pulse PSP is supplied, the actual scan pulse RSP is supplied. The actual data RData1 is supplied to the first horizontal line during the / 2 horizontal period H / 2. Then, during the 1/2 horizontal period (H / 2) during which the precharge scan pulse (PSP) is supplied, the precharge data (PData2) is supplied to the second horizontal line, and then the actual scan pulse (RSP) is supplied. During the two horizontal periods (H / 2), the actual data (RData2) is supplied to the second horizontal line.

After the precharge data PData and the actual data RData are supplied to the first horizontal line and the second horizontal line, the gate driver 130 has a half horizontal period (half horizontal period (3) to the third gate line GL3 located at the third horizontal line. After supplying the precharge scan pulse PSP for H / 2), supply the precharge scan pulse PSP for the 1/2 horizontal period H / 2 to the fourth gate line GL4 located on the fourth horizontal line. After that, the actual scan pulse RSP is supplied to the third gate line GL3 for 1/2 horizontal period H / 2. Subsequently, the gate driver 130 supplies the actual scan pulse RSP to the fourth gate line GL4 during the 1/2 horizontal period H / 2. In this case, after the precharge data PData3 is supplied to the third horizontal line during the 1/2 horizontal period H / 2 during which the precharge scan pulse PSP is supplied, the actual scan pulse RSP is supplied. The actual data RData3 is supplied to the third horizontal line during the / 2 horizontal period H / 2. Then, during the 1/2 horizontal period (H / 2) during which the precharge scan pulse (PSP) is supplied, the precharge data (PData4) is supplied to the fourth horizontal line, and then the actual scan pulse (RSP) is supplied. The actual data RData4 is supplied to the fourth horizontal line during the two horizontal periods H / 2. That is, the gate driver continuously supplies a precharge scan pulse (PSP) to the odd and even horizontal lines of the adjacent odd and even horizontal lines, and then the odd and even horizontal lines. The actual scan pulse (RSP) is continuously supplied to the

The gate driver 130 sequentially performs the supply process of the precharge scan pulse PSP and the actual scan pulse RSP, thereby performing a precharge scan from the first gate line GL1 to the last gate line GLn. A pulse PSP and an actual scan pulse RSP are supplied to each gate line.

The gamma reference voltage generator 140 receives a high potential power supply voltage VDD to generate a positive gamma reference voltage and a negative gamma reference voltage and output the same to the data driver 120.

The backlight assembly 150 is disposed on the rear surface of the liquid crystal display panel 110 and emits light by an AC voltage and a current supplied from the inverter 160 to irradiate light to each pixel of the liquid crystal display panel 110.

The inverter 160 converts the square wave signal generated therein into a triangular wave signal and compares the triangular wave signal with a DC power supply voltage (VCC) supplied from the system to generate a burst dimming signal proportional to the comparison result. . When the burst dimming signal is generated, the driving IC (not shown) provided in the inverter 160 controls the generation of the AC voltage and the current supplied to the backlight assembly 150 according to the burst dimming signal.

The common voltage generator 170 receives the high potential power voltage VDD to generate the common voltage Vcom and supplies the common voltage Vcom to the common electrodes of the liquid crystal cells Clc of each pixel of the liquid crystal display panel 110.

The gate driving voltage generator 180 receives the high potential power voltage VDD to generate the gate high voltage VGH and the gate low voltage VGL to supply the gate driver 130 to the gate driver 130. Here, the gate driving voltage generation unit 180 generates a gate high voltage VGH that is greater than or equal to the threshold voltage of the TFTs provided in each pixel of the liquid crystal display panel 110, and the gate low voltage that is less than or equal to the threshold voltage of the TFT. VGL). The gate high voltage VGH and the gate low voltage VGL generated as described above are used to determine the high level voltage and the low level voltage of the scan pulse generated by the gate driver 130, respectively.

The timing controller 190 supplies the digital video data RGB supplied from the system to the data driver 120, and the horizontal / vertical synchronization signals H and V from the system according to the clock signal CLK from the system. It receives the input and generates a data drive control signal (DDC) to supply to the data driver 120. The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and the like.

In addition, the timing controller 190 receives the horizontal / vertical synchronization signals H and V from the system in response to the clock signal CLK from the system, which is a gate start pulse GSP, a gate shift clock GSC, and a gate output. Able signal GOE is generated and supplied to the gate driver 130. Here, the gate start pulse GSP instructs the supply of scan pulses, and the gate shift clock GSC instructs that the sequentially supplied scan pulses are shifted by one horizontal line unit. The gate output enable signal GOE is a signal for instructing to pause the supply of scan pulses sequentially supplied to each horizontal line in units of horizontal lines, that is, in a masking period of scan pulses generated for each horizontal line. Instructs the supply of scan pulses to be stopped.

6 is a configuration diagram of a liquid crystal display according to another exemplary embodiment of the present invention. 6, the gamma reference voltage generator 140, the backlight assembly 150, the inverter 160, the same as the liquid crystal display 100 shown in FIG. 4. Although the common voltage generator 170 and the gate driving voltage generator 180 are provided, these components are not shown in FIG. 6.

Referring to FIG. 6, the liquid crystal display 200 according to another exemplary embodiment of the present invention may include precharge data on the liquid crystal display panel 110 and the data lines DL1 to DLm of the liquid crystal display panel 110. The precharge scan pulse PSP and the actual scan pulse RSP are applied to the data driver 210 for supplying the PData and the actual data RData, and to the gate lines GL1 to GLn of the liquid crystal display panel 110. A gate driver 220 for supplying, and a timing controller 230 for controlling the data driver 210 and the gate driver 220 are provided.

The data driver 210 supplies data to the data lines DL1 to DLm in response to the data driving control signal DDC supplied from the timing controller 230, and digital video data supplied from the timing controller 230. After sampling and latching the RGB, the liquid crystal cell Clc of the liquid crystal display panel 110 is converted into an analog data voltage capable of expressing gray scale based on the gamma reference voltage supplied from the gamma reference voltage generator 140. Supply to the data lines DL1 to DLm.

The data driver 210 sequentially supplies the precharge data PData and the actual data RData to each horizontal line including one gate line, where the precharge data PData is provided for one horizontal period 1H. And real data (RData) are sequentially supplied to the same horizontal line. That is, the data driver 210 sequentially supplies precharge data and actual data to an upper horizontal line among neighboring upper horizontal lines and lower horizontal lines, and then precharge data (PData) and actual data ( RData) is supplied sequentially. In particular, even if the data voltage having different polarities are supplied to different horizontal lines according to the data inversion method of the liquid crystal display device 200, the data driver 210 according to the present invention is the same regardless of the data inversion method. The precharge data (PData) and the actual data (RData) of the same polarity are supplied to the horizontal line.

A more detailed operation of the data driver 210 will now be described with reference to FIG. 7.

Looking at the process of supplying the precharge data PData1 and the actual data RData1 to the first horizontal line, the data driver 210 has a half horizontal period H in which the precharge scan pulse PSP is supplied to the first horizontal line. / 2), the precharge data PData1 is supplied, and then the actual data RData1 is supplied during the 1/2 horizontal period H / 2 where the actual scan pulse RSP is supplied to the first horizontal line. Here, the precharge data PData1 and the actual data RData1 have the same polarity.

After the precharge data PData1 and the actual data RData1 are supplied to the first horizontal line, the data driver 210 provides a 1/2 horizontal period in which the precharge scan pulse PSP is supplied to the second horizontal line. Next, the precharge data PData2 is supplied for a second period, and then the actual data RData2 is supplied for a half horizontal period H / 2 where the actual scan pulse RSP is supplied to the second horizontal line. Here, the precharge data PData2 and the actual data RData2 have the same polarity.

The data driver 210 repeatedly executes the precharging data PData and the actual data RData, and thus the precharge data PData and the actual data RData from the first horizontal line to the last horizontal line. ) Are supplied to each horizontal line sequentially. However, the data driver 120 supplies precharge data PData and actual data RData of the same polarity to the same horizontal line.

The gate driver 220 responds to the precharge scan pulse PSP and the actual scan pulse in response to the gate start pulse GSP, the gate shift clock GSC, and the gate output enable GOE supplied from the timing controller 230. RSP are generated sequentially and supplied to the gate lines GL1 to GLn.

The process of supplying the precharge scan pulse PSP and the actual scan pulse RSP by the gate driver 220 will be described in more detail with reference to FIG. 7.

As shown in FIG. 7, the gate driver 220 supplies the precharge scan pulse PSP to the first gate line GL1 positioned in the first horizontal line for 1/2 horizontal period H / 2. The real scan pulse RSP is supplied to the first gate line GL1 for 1/2 horizontal period H / 2. In this case, the precharge data PData1 is supplied to the first horizontal line during the 1/2 horizontal period H / 2 where the precharge scan pulse PSP is supplied, and then the actual scan pulse RSP is supplied. The actual data RData1 is supplied to the first horizontal line during the two horizontal periods H / 2.

After the precharge scan pulse PSP and the actual scan pulse RSP are sequentially supplied to the first gate line GL1, the gate driver 220 is connected to the second gate line GL2 positioned at the second horizontal line. After the precharge scan pulse PSP is supplied for two horizontal periods H / 2, the actual scan pulse RSP is supplied to the second gate line GL2 for one half horizontal period H / 2. . In this case, the precharge data PData2 is supplied to the second horizontal line during the 1/2 horizontal period H / 2 during which the precharge scan pulse PSP is supplied, and then the actual scan pulse RSP is supplied. Actual data RData2 is supplied to the second horizontal line during the two horizontal periods H / 2.

 That is, the gate driver 220 continuously supplies a precharge scan pulse PSP and an actual scan pulse RSP to an upper horizontal line among neighboring upper horizontal lines and lower horizontal lines, and then precharges the lower horizontal lines. The pulse PSP and the actual scan pulse RSP are continuously supplied.

The gate driver 220 sequentially performs the supply process of the precharge scan pulse PSP and the actual scan pulse RSP, thereby precharging the scan pulse from the first gate line GL1 to the last gate line GLn. (PSP) and the actual scan pulse (RSP) are sequentially supplied to each gate line.

The timing controller 230 supplies the digital video data RGB supplied from the system to the data driver 210, and the horizontal / vertical synchronization signals H and V from the system according to the clock signal CLK from the system. It receives the input and generates a data drive control signal (DDC) to supply to the data driver (210). The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and the like.

In addition, the timing controller 230 receives the horizontal / vertical synchronization signals H and V from the system according to the clock signal CLK from the system, and starts the gate start pulse GSP, the gate shift clock GSC, and the gate output. The enable signal GOE is generated and supplied to the gate driver 220.

8 is a characteristic diagram showing the response characteristics of the liquid crystal by the liquid crystal display device according to the present invention.

In FIG. 8, part A1 shows characteristics of the response speed of the liquid crystal when the data voltage of the same polarity is continuously supplied to the liquid crystal in the same pixel for one frame period.

As shown in part A1 of FIG. 8, when the data voltages of the same polarity are continuously supplied to the liquid crystal in the same pixel, the slope of the rising response characteristic of the liquid crystal becomes very large, which is caused by the elastic repulsive force of the liquid crystal.

Since the slope of the rising response characteristic of the liquid crystal is proportional to the response speed of the liquid crystal, the present invention significantly improves the response speed of the liquid crystal by continuously supplying precharge data and actual data of the same polarity to each pixel for one frame period. Therefore, the high speed driving of the liquid crystal display device is possible without using a memory used for the high speed driving of the liquid crystal display device.

As described above, according to the present invention, the pre-charge data and the actual data of the same polarity are sequentially supplied to each pixel during one frame driving period, thereby the response of the liquid crystal without using the memory used for high-speed driving of the liquid crystal display The speed is greatly improved, which reduces the cost for high speed operation.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

Claims (18)

A liquid crystal display panel in which a plurality of horizontal lines are formed; A data driver supplying precharge data and actual data to the horizontal lines in units of one horizontal line; And A gate driver sequentially supplying precharge scan pulses and actual scan pulses to the horizontal lines; The data driver sequentially supplies precharge data and actual data of the same polarity to each horizontal line of the liquid crystal display panel. And the gate driver sequentially supplies one precharge scan pulse and one actual scan pulse to each horizontal line of the liquid crystal display panel. The method of claim 1, The data driver continuously supplies precharge data to the odd-numbered and even-numbered horizontal lines of the adjacent odd-numbered horizontal lines and the even-numbered horizontal lines, and then outputs actual data to the odd-numbered and even-numbered horizontal lines. Liquid crystal display characterized in that for continuously supplying. The method of claim 2, And the data driver supplies precharge data within a half horizontal period and supplies actual data within a half horizontal period. The method of claim 2, The gate driver continuously supplies the precharge scan pulses to the odd and even horizontal lines of the neighboring odd and even horizontal lines, and then the odd and even horizontal lines. And continuously supplying the actual scan pulses to the liquid crystal display. The method of claim 4, wherein And the gate driver supplies the precharge scan pulse for a half horizontal period and the actual scan pulse for a half horizontal period. The method of claim 1, The data driver sequentially supplies precharge data and actual data to the upper horizontal line among neighboring upper horizontal lines and lower horizontal lines, and then sequentially supplies precharge data and actual data to the lower horizontal line. A liquid crystal display device. The method of claim 6, And the data driver supplies precharge data within a half horizontal period and supplies actual data within a half horizontal period. The method of claim 6, The gate driver continuously supplies the precharge scan pulse and the actual scan pulse to the upper horizontal line among the adjacent upper horizontal line and the lower horizontal line, and then the precharge scan pulse and the actual to the lower horizontal line. A liquid crystal display characterized by supplying scan pulses continuously. The method of claim 8, And the gate driver supplies the precharge scan pulse for a half horizontal period and the actual scan pulse for a half horizontal period. A driving method of a liquid crystal display device having a liquid crystal display panel having a plurality of horizontal lines formed therein, Supplying precharge data and actual data to the horizontal lines in units of one horizontal line; And Sequentially supplying precharge scan pulses and actual scan pulses to the horizontal lines; In the data supply step, precharge data and actual data of the same polarity are sequentially supplied to each horizontal line of the liquid crystal display panel. And in the scanning pulse supplying step, one precharge scan pulse and one actual scan pulse are sequentially supplied to each horizontal line of the liquid crystal display panel. The method of claim 10, In the data supplying step, precharge data is continuously supplied to the odd-numbered and even-numbered horizontal lines among the adjacent odd-numbered horizontal lines and even-numbered horizontal lines, and then to the odd-numbered horizontal lines and even-numbered horizontal lines. A method of driving a liquid crystal display device, characterized by continuously supplying actual data. The method of claim 11, And in the data supplying step, precharge data is supplied within a half horizontal period and actual data is supplied within a half horizontal period. The method of claim 11, In the scan pulse supplying step, the precharge scan pulse is continuously supplied to the odd horizontal lines and the even horizontal lines of the neighboring odd-numbered horizontal lines and the even-numbered horizontal lines. And the actual scan pulse is continuously supplied to even-numbered horizontal lines. The method of claim 13, And in the scanning pulse supplying step, supplying the precharge scan pulse for 1/2 horizontal period and the actual scan pulse for 1/2 horizontal period. The method of claim 10, In the data supplying step, precharge data and actual data are sequentially supplied to the upper horizontal line among neighboring upper horizontal lines and lower horizontal lines, and then the precharge data and the actual data are sequentially supplied to the lower horizontal line. A method of driving a liquid crystal display device, characterized in that. The method of claim 15, And in the data supplying step, precharge data is supplied within a half horizontal period and actual data is supplied within a half horizontal period. The method of claim 15, In the scan pulse supplying step, the precharge scan pulse and the actual scan pulse are continuously supplied to the upper horizontal line among the neighboring upper horizontal line and the lower horizontal line, and then the precharge scan pulse to the lower horizontal line. And the actual scan pulse is continuously supplied. The method of claim 17, And in the scanning pulse supplying step, supplying the precharge scan pulse for 1/2 horizontal period and the actual scan pulse for 1/2 horizontal period.

Images