KR100499574B1 - Liquid Crystal Display device and Methode for Driving at the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device and a driving method thereof, and the liquid crystal display device and the driving method thereof according to the present invention can prevent a motion blur phenomenon by turning on and turning on a fluorescent lamp with a divided horizontal synchronization signal, and the upper image signal. And simultaneously driving the plurality of fluorescent lamps according to the output of the lower image signal.

Description

Liquid crystal display device and method for driving at the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and to a liquid crystal display device, and more particularly, to a liquid crystal display device and a driving method thereof capable of increasing luminance by sequentially driving each of a plurality of divided fluorescent lamps in accordance with division driving.

Recently, due to the rapid development of the information and communication field, the importance of the display industry for displaying desired information is increasing day by day. To date, the CRT (Cathode Ray Tube) among the information display devices can display various colors, and the brightness of the screen is increased. It has also enjoyed steady popularity so far because of its superiority.

However, there is an urgent need for the development of flat panel displays instead of CRTs that are bulky and bulky due to the desire for large, portable and high resolution displays. These flat panel displays have a wide range of applications from computer monitors to displays used in aircraft and spacecraft.

Currently produced or developed flat panel displays include liquid crystal display (LCD), electro luminescent display (ELD), field emission display (FED), plasma display panel (PDP) Light weight, high brightness, high efficiency, high resolution, high speed response characteristics, low driving voltage, low power consumption, low cost, and color display characteristics are required for an ideal flat panel display. Among such flat panel displays, the liquid crystal display device is in the spotlight because of its durability as well as its desire.

A liquid crystal display device is an image display device using optical anisotropy characteristics of liquid crystals. When light is irradiated onto a liquid crystal having polarization characteristics according to a voltage application state, the liquid crystal display device determines the amount of light that passes according to the alignment state of the liquid crystals according to the voltage application. It is a device that can control and express an image.

As described above, in order to configure the liquid crystal display device, a liquid crystal panel including a liquid crystal formed between two substrates and a driving circuit provided around the liquid crystal panel to apply a signal to the liquid crystal panel and control such a signal are required. Do.

In this case, since the liquid crystal panel does not emit light by itself, the reflective liquid crystal display device is restricted from being used in a dark space when it is reflected from the liquid crystal panel using external light such as sunlight.

Accordingly, the transmissive liquid crystal display device may solve a problem of space limitation by providing a separate backlight under the liquid crystal panel and irradiating parallel rays.

A general description of the transmissive TN mode liquid crystal display device is as follows.

1 is a schematic perspective view of a liquid crystal display of a general transmissive TN mode.

As shown in FIG. 1, the liquid crystal display device includes a liquid crystal panel 10 including an upper substrate 11, a lower substrate 12, and a liquid crystal layer 13 formed between the two substrates to express colors, and The first and second polarizing plates 14 and 15 are disposed above and below the liquid crystal panel 10 such that the polarizers are orthogonal to each other.

Although not shown, a lower portion of the liquid crystal panel 10 includes a light guide plate, a reflecting plate, a diffusion plate, and a prism for transmitting light emitted from a light source such as a fluorescent lamp.

Here, the lower substrate 12 is also called an array substrate, and a thin film transistor (not shown), which is a switching element, and a pixel electrode (not shown) for displaying an image are formed in a matrix type.

The upper substrate 11 is also referred to as a color filter substrate, and has a black matrix for preventing light leakage to the outside of the pixel region, and colors of R (red), G (green), and B (blue) corresponding to the pixel electrode. And a common electrode (not shown) on the black matrix and the color filter.

Pixel electrodes (not shown) and common electrodes (not shown) respectively formed on the lower substrate 12 and the upper substrate 11 are indium-tin oxides for transmitting light emitted from the backlight. -oxide: It is composed of transparent conductive metal such as ITO). In this case, in the IPS mode liquid crystal display, the common electrode is formed on the lower substrate.

The liquid crystal molecules 18 of the liquid crystal layer 13 formed between the upper substrate 11 and the lower substrate 12 are formed by the alignment layer (not shown) formed on the surfaces of the two substrates facing each other. The azimuth angles from 12) to the upper substrate 11 are twisted by 90 degrees.

In addition, the first and second polarizing plates 14 and 15 have a characteristic in which the polarization direction is vertical.

That is, white light irradiated from the backlight is polarized in one direction by the first polarizing plate 14, and the light polarized by the first polarizing plate 14 is refracted by the lower substrate 12 and the liquid crystal layer 13. do.

At this time, as shown, the light incident on the liquid crystal layer 13 is refracted to be orthogonal to the direction polarized by the first polarizing plate 14 by rotating the azimuth angle by 90 degrees by the twisting of the liquid crystal molecules 18. . As such, the intensity of transmitted light may be adjusted by adjusting the azimuth or polar angle of the liquid crystal molecules 18 in the liquid crystal layer 13.

In addition, the white light refracted by the liquid crystal layer 13 passes through the upper substrate 11 on which a color filter (not shown) capable of expressing an RGB color is formed, and the upper substrate 11 has a color. Light passes through the second polarizing plate 15 and is represented as an image.

Accordingly, a general liquid crystal display device may implement an image by adjusting the intensity of transmitted light after expressing polarization and refraction using light irradiated from a backlight and expressing color.

On the other hand, the backlight for supplying parallel light in such a liquid crystal display device is a method of disposing a cylindrical fluorescent lamp, it is divided into a direct type method and a light guide plate method.

First, the direct type disposes the fluorescent lamp on the plane. Since the shape of the fluorescent lamp appears on the liquid crystal panel, the distance between the lamp and the liquid crystal panel must be maintained, and the light scattering means must be disposed for the uniform distribution of light quantity. There is a limit to thinning. In addition, as the panel becomes larger, the area of the light exit surface of the backlight also increases. When the direct backlight is enlarged, the light exit surface is not flat unless the light scattering means secures sufficient thickness. Therefore, the thickness of the light scattering means must be sufficiently secured.

On the other hand, the light guide plate method is to install a fluorescent lamp on the outside and to distribute the light to the entire surface by using the light guide plate, the fluorescent lamp is installed on the side, there is a problem that the brightness is low because the light must pass through the light guide plate. In addition, high optical design and processing technology for the light guide plate is required for uniform distribution of light intensity.

Since the direct type and the light guide plate have their disadvantages, the direct type backlight is mainly used in the liquid crystal display device where brightness is more important than the screen thickness. In the liquid crystal display device of importance, a light guide plate type backlight is mainly used.

At present, in order to realize a high-brightness backlight in accordance with the trend of larger screens, research and development on direct type backlights continue, such as placing several lamps under the display screen or bending one lamp. There is a trend.

2 is a perspective view of a general direct backlight.

As shown in FIG. 2, a general direct backlight has a plurality of fluorescent lamps 1 arranged side by side in one direction, an outer case 3 for fixing and supporting the fluorescent lamps 1, and the fluorescent lamps. The light scattering means 5a, 5b, 5c arrange | positioned between (1) and the liquid crystal panel (10 of FIG. 1) is comprised.

Here, the light scattering means 5a, 5b, and 5c are for preventing the shape of the fluorescent lamp 1 from appearing on the display surface of the liquid crystal panel and providing a light source having a uniform brightness distribution as a whole. In order to promote the liquid crystal panel 10, a plurality of diffusion sheets, a diffusion plate, and the like are formed between the liquid crystal panel 10.

Although not shown, a reflection plate 7 is formed on the inner surface of the outer case 3 to concentrate the light generated from the fluorescent lamp 1 onto the display unit of the liquid crystal panel 10 to increase the efficiency of the light.

At this time, both electrodes of the fluorescent lamps 1 are connected to an inverter circuit (not shown) for applying an alternating current.

Such a general direct type backlight may be driven all the time to supply light of uniform intensity to the entire rear surface of the liquid crystal panel to control the transmitted light in the liquid crystal panel.

However, when the direct type backlight is always driven, the liquid crystal molecules 18 are arranged vertically and horizontally according to an electric field applied between the two substrates of the liquid crystal panel 10 to some extent due to the limitation of the change. Has a delay rate of. This speed is referred to as the response speed of the liquid crystal, and the response speed of the screen of the liquid crystal display device leaves a trailing afterimage.

In particular, in order to realize a moving image, many frames pass by several tens of Hz or more every second, and the liquid crystal molecules 18 need to change a lot of electric fields due to the large number of passing frames. The afterimage phenomenon due to the speed delay becomes more severe and generates motion blur. In this case, the person perceives the afterimage as a drag phenomenon of the screen.

Accordingly, the fluorescent lamp 1 may be sequentially driven together with the horizontal synchronization signal applied to the liquid crystal panel 10 in order to prevent the screen drag caused by the motion blur.

3 is a schematic driving circuit diagram of a liquid crystal display device according to the prior art, and FIG. 4 is a timing diagram of one frame of the liquid crystal display device according to the prior art.

As shown in FIG. 3, the liquid crystal display device according to the related art includes a liquid crystal panel 10 including a liquid crystal between a pair of substrates, and a plurality of fluorescent lamps for irradiating transmitted light from the rear of the liquid crystal panel 10. 1), the inverter circuit 31 for applying a high voltage AC current to the fluorescent lamp 1, and outputting data and various control signals applied to the inverter circuit 31 and the liquid crystal panel 10; It comprises a timing controller 32 for.

Although not shown, the inverter circuit 31 includes a plurality of inverter controllers, transformers, and ballast circuits for driving the plurality of fluorescent lamps 1.

Here, the timing controller 32 receives a data signal received from a graphic controller (not shown) to a gate driver (not shown) and a data driver (not shown) for driving the liquid crystal panel 10, respectively. A gate control signal, a source control signal, and a data signal are output, and a control signal for sequentially operating the plurality of fluorescent lamps 1 in one frame is output.

At this time, the inverter circuit 31 sequentially operates the plurality of fluorescent lamps 1 in accordance with the gate control signal in one frame by a control signal input from the timing controller 32.

Therefore, the liquid crystal display of the prior art can drive the plurality of fluorescent lamps 1 sequentially during one frame by the control of the timing controller 32.

4 is a timing diagram illustrating an operation of a timing controller of a liquid crystal display device according to the related art.

As shown in FIG. 4, the timing controller 32 of the liquid crystal display according to the prior art applies a vertical synchronization signal to indicate the start and end of one frame, and scans the corresponding gate line 16 during the vertical synchronization. Apply a horizontal synchronizing signal to indicate the start and end, apply a data signal to each data line 17 of the RGB color during horizontal synchronizing, and sequentially control the corresponding fluorescent lamp 1 control signal according to the horizontal synchronizing signal. Output

 In this case, the fluorescent lamps 1 are composed of n, and since only one turn is sequentially turned on within one frame, the time of each fluorescent lamp 1 is frame / n.

In addition, when the turn-on time of the fluorescent lamp 1 is not the same as the application time of the data signal, and when the data signal for realizing the image reaches a target value, that is, the liquid crystal according to the application of the data signal If the response is above the appropriate level, by turning on the backlight, it is possible to minimize the effect of the image of the previous frame to the image of the current frame, it is possible to prevent the motion blur phenomenon.

In this case, when the horizontal synchronization signal is applied to the corresponding gate line 16, the data signal is collectively applied to the plurality of data lines 17.

Therefore, the liquid crystal display of the related art can prevent the motion blur phenomenon by sequentially driving the plurality of fluorescent lamps 1 in one frame according to the horizontal synchronization signal.

However, the liquid crystal display of the prior art had the following problems.

Prior art liquid crystal displays have driven fluorescent lamps sequentially in one frame to prevent motion blur, but have a disadvantage in that the luminance is much lower than that of driving a plurality of fluorescent lamps at all times.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the liquid crystal display device and its driving which can increase the brightness by driving the liquid crystal panel to the upper and lower parts respectively, and sequentially driving a plurality of fluorescent lamps in accordance with the division driving. The purpose is to provide a method.

The liquid crystal display of the present invention for achieving the above object is a liquid crystal panel having a plurality of gate lines and data lines arranged in a direction perpendicular to each other and having a matrix-type pixel region, and the data of the previous frame input from the outside A timing controller for generating a horizontal division control signal and a data signal for horizontally driving the liquid crystal panel horizontally using the frame memory to be stored, the frame data stored in the frame memory, and the horizontal division control signal; A data driver for supplying the data signal to the data line of the liquid crystal panel, a gate driver for supplying a gate driving pulse to the gate line using the horizontal division control signal, and transmitted light from the rear of each of the upper and lower parts of the liquid crystal panel. A plurality of fluorescent lamps for irradiation; And an inverter circuit for sequentially applying a high voltage AC current to at least two fluorescent lamps in synchronization with the horizontal division driving of the liquid crystal panel according to the horizontal division control signal.

Here, the timing controller preferably outputs a control signal to the inverter circuit to sequentially drive the plurality of fluorescent lamps in one frame in the upper and lower parts.

In addition, another aspect of the present invention, the step of storing the data of the previous frame from the outside in the frame memory and output to the timing controller, a vertical synchronization signal for indicating the start and end of one frame in the timing controller, and the vertical Outputting a horizontal synchronizing signal and a data signal to the gate driver and the data driver for horizontally driving the liquid crystal panel horizontally up and down during synchronization; and applying the gate driver to the upper and lower parts according to the horizontal division driving of the liquid crystal panel. Alternately driving gate lines alternately, applying a horizontal synchronizing signal according to horizontal division driving of the liquid crystal panel using the data driver, and simultaneously outputting data signals of RGB colors to a plurality of data lines; Rear surfaces of upper and lower parts of the liquid crystal panel And sequentially outputting turn-on signals to the plurality of fluorescent lamps divided according to the horizontal division driving of the liquid crystal panel to irradiate the transmitted light.

Here, the driving signal of the upper first gate line of the liquid crystal panel is generated by a logical product operation of a gate start pulse and an externally input clock signal, and the driving signal of the lower first gate line of the liquid crystal panel is the gate start pulse. And generating an exclusive OR operation of the clock signal.

According to an external drive signal and an image signal, a plurality of liquid crystal panels for displaying an image by controlling a liquid crystal formed between upper and lower substrates are horizontally driven, and a plurality of fluorescent lamps disposed on the rear surface of the liquid crystal panel according to the horizontal division driving. It is preferable to drive by sequentially dividing each.

The plurality of fluorescent lamps are divided into two regions, the first and second regions being sequentially driven by simultaneously driving one fluorescent lamp corresponding to the first region and one fluorescent lamp corresponding to the second region in one frame. It is desirable to.

Preferably, the plurality of fluorescent lamps are driven at a time of 2 x frame / n (where n is the number of fluorescent lamps).

Hereinafter, the liquid crystal display of the present invention will be described in detail with reference to the accompanying drawings.

5 is a schematic driving circuit diagram of a liquid crystal display according to the present invention.

As shown in FIG. 5, the liquid crystal display according to the present invention includes a liquid crystal panel 105 having a plurality of gate lines 101 and data lines 103 arranged in a direction perpendicular to each other and having a pixel region in a matrix form. The liquid crystal panel 105 is configured by using the frame memory 113 for storing all the data of the previous frame and the frame data stored in the frame memory 113 to divide the liquid crystal panel 105 into upper and lower portions, respectively, and to horizontally drive the liquid crystal panel 105. A timing controller 111 for outputting a horizontal division control signal to the first and second timing portions of the upper and lower portions of the liquid crystal panel 105 according to the horizontal division driving of the liquid crystal panel 105. A plurality of fluorescent lamps 107 which are dividedly driven so that at least two or more are turned on by the timing controller 111 for irradiation, and divided driving of the fluorescent lamps 107 And an inverter circuit 109 for applying a high voltage AC current to the fluorescent lamps 107 that are turned on according to a control signal.

Although not shown, a data driver and a gate for inputting a control signal output from the timing controller 111 to the data line 103 and the gate line 101 of the liquid crystal panel 105 respectively. A driver, a power supply for supplying a voltage required for the liquid crystal panel 105 and each part, and a reference voltage for supplying power from the power supply and converting digital data input from the data driver into analog data. A constant voltage (V _DD ), a gate high voltage (V _GH ), a gate low voltage (V _GL ), a reference voltage (V _ref ) used in the liquid crystal panel 105 by using a gamma reference voltage unit and a voltage output from the power supply unit. And a DC / DC converter configured to output a common voltage Vcom.

In addition, the inverter circuit 109 includes a plurality of inverter controllers, transformers, and ballast circuits to drive the plurality of fluorescent lamps 107.

When the previous frame data signal is input from the outside, the frame memory 113 stores all data signals of one frame and outputs them to the timing controller.

In addition, the timing controller 111 horizontally divides the corresponding frame data received from the frame memory 113 and then uses the horizontal divided data signal to provide a gate control signal and a source control signal to the gate driver and the data driver, respectively. And a data signal and a control signal for sequentially operating the plurality of fluorescent lamps 117 within one frame according to the horizontal division.

In addition, the timing controller 111 divides an upper data signal and a lower data signal of the liquid crystal panel and outputs the divided data to the data driver.

In this case, the fluorescent lamp 107 is parallel to the gate line 101, and is installed on the rear surface of the liquid crystal panel 105 so as to overlap the plurality of gate lines 101.

That is, the timing controller 111 drives the gate driver and the data drive by dividing an upper screen and a lower screen for each frame by using the divided driving data signal input from the frame memory 113, and the inverter circuit. 109 is synchronized with the split screen driving of the gate driver and the data drive, and the fluorescent lamps 107 corresponding to the upper and lower portions of the liquid crystal panel 105 are sequentially driven according to the split screen driving.

Accordingly, the liquid crystal display of the present invention divides and drives the liquid crystal panel 105 into an upper screen and a lower screen, respectively, by using the divided data signal output from the frame memory 113, and from the rear of the liquid crystal panel 105 to the rear. Motion blur can be reduced by sequentially driving a plurality of fluorescent lamps 107 for irradiating light, and at least two or more fluorescent lamps 107 are driven together in accordance with the divided screen driving of the liquid crystal panel 105. Can increase.

Referring to the driving method of the liquid crystal display device of the present invention having such a configuration as follows.

First, the frame memory 113 stores previous frame data input from the outside, and outputs one frame data to the timing controller when one frame data is stored in the frame memory.

Subsequently, the frame data input to the timing controller 111 is divided into upper and lower portions of the liquid crystal panel 105 to output control signals and data signals of the gate driver and the data driver.

6A to 6B illustrate a driving method of the liquid crystal display according to the present invention, and gate start pulses are applied to the upper and lower gate drivers 121a and 121b from the timing controller 111, respectively. When the clock signal is generated from the outside, the turn-on signal of the first gate line of the upper gate driver 121a is generated by an AND operation of the gate start pulse and the clock signal.

In addition, the turn-on signal of the first gate line of the lower gate driver 121b is generated by an exclusive OR operation of the gate start pulse and the clock signal.

Therefore, when a control signal (Output Gate pulse) of the upper and lower gate drivers 121a and 121b is input, the gate driver is the upper and lower portions of the upper and lower portions of the liquid crystal panel 105 because the control signal is a signal delayed by one frame. The first gate line 101, the lower first gate line 101, the upper second gate line 101, and the lower second gate line 101, respectively, in that order. Alternately turn on the gate lines of the upper and lower parts of the switch.

At the same time, when a control signal and a data signal of the data driver are input, the data driver first receives the vertical synchronization signal Vsync output from the timing controller 111, and the gate is divided and driven up and down of the liquid crystal panel. After sequentially sampling and holding the first data of the upper part, the first data of the lower part, the second data of the upper part and the second data signal of the lower part so as to be synchronized with the turn-on signal of the line 101, a digital analogue The data signal is output to the data line 103 of each pixel via a converter.

In addition, the timing controller 111 may sequentially drive the plurality of fluorescent lamps 107 which are divided into upper and lower parts on the rear surface of the liquid crystal panel 105 according to a control signal of the liquid crystal panel 105 which is horizontally divided and driven. The turn-on control signal of the fluorescent lamp 117 is output to the inverter circuit.

In addition, the inverter circuit divides the plurality of fluorescent lamps 107 into upper and lower portions as in the liquid crystal panel 105 by the turn-on control signal of the fluorescent lamp 117, and includes one fluorescent lamp 107 corresponding to the upper portion. ) And one fluorescent lamp 107 corresponding to the lower part are sequentially driven in one frame.

Therefore, the driving method of the liquid crystal display device according to the present invention has two times higher luminance than the conventional method by dividing the fluorescent lamp 117 sequentially for one frame according to the horizontal division driving of the liquid crystal panel 105. Can be improved.

FIG. 7 is a timing diagram illustrating an operation of a liquid crystal display according to the present invention, and outputs a vertical sync signal (Vsync) 115 to the data driver to indicate the start and end of one frame from the timing controller 111. And a turn-on signal of a plurality of fluorescent lamps which output a horizontal synchronizing signal to upper and lower gate drivers during the vertical synchronizing, and are separately driven according to a turn-on signal output by the upper and lower gate drivers.

For example, when the plurality of fluorescent lamps 107 are composed of n pieces (L1, L2, ... L (n / 2), L (n / 2 + 1) .. L (n)), As a result, since a plurality of turns on sequentially in one frame, the driving time of each fluorescent lamp is 2 x frame / n.

Therefore, in the liquid crystal display device of the present invention, at least a plurality of the n fluorescent lamps 107 are driven, and the driving time is longer than in the prior art, so that the luminance is increased.

That is, in the driving method of the liquid crystal display of the present invention, the vertical division driving and the fluorescent lamp driving of the liquid crystal panel are performed as shown in FIG. 8.

In this case, since at least two or more of the n fluorescent lamps 107 are turned on, the luminance may be increased as compared with the related art.

Therefore, the liquid crystal display according to the present invention can prevent the motion blur by turning on and turning on the fluorescent lamp 107 together with the horizontal division driving signal of the liquid crystal panel 105, thereby preventing the output of the upper data signal and the lower data signal. Accordingly, the luminance can be increased by simultaneously driving the plurality of fluorescent lamps 107 sequentially.

As described above, the liquid crystal display of the present invention has the following effects.

In the liquid crystal display of the present invention, the luminance can be increased by simultaneously driving a plurality of fluorescent lamps in accordance with the output of the horizontally driven data signal.

1 is a schematic perspective view of a general liquid crystal display device.

2 is a perspective view of a general direct backlight.

3 is a schematic driving circuit diagram of a liquid crystal display device according to the prior art.

4 is a timing diagram illustrating an operation of a timing controller of a liquid crystal display device according to the related art.

5 is a schematic driving circuit diagram of a liquid crystal display according to the present invention.

6A to 6B illustrate a method of driving a liquid crystal display according to the present invention.

7 is a timing diagram illustrating an operation of a liquid crystal display according to the present invention.

8 is a view showing driving of the liquid crystal display according to the present invention.

* Description of the main parts of the drawings *

101: gate line 103: data line

105: liquid crystal panel 107: fluorescent lamp

109: inverter circuit 111: timing controller

113: frame memory 115: vertical sync signal

117: horizontal synchronizing signal 119: data signal

121a, 121b: Gate Drivers

Claims (7)

A liquid crystal panel in which a plurality of gate lines and data lines are arranged in a direction perpendicular to each other and having a pixel region in a matrix form; A frame memory for storing all data of a previous frame input from the outside; A timing controller for generating a data signal and a horizontal division control signal for horizontally driving the liquid crystal panel up and down using the frame data stored in the frame memory; A data driver for supplying the data signal to the data line of the liquid crystal panel using the horizontal division control signal; A gate driver supplying a gate driving pulse to the gate line using the horizontal division control signal; A plurality of fluorescent lamps for irradiating the transmitted light from the back of the upper and lower portions of the liquid crystal panel, And an inverter circuit for sequentially applying a high voltage AC current to at least two fluorescent lamps in synchronization with the horizontal division driving of the liquid crystal panel according to the horizontal division control signal. The method of claim 1, And the timing controller outputs, to the inverter circuit, control signals for sequentially driving the plurality of fluorescent lamps in one frame up and down. Storing the data of the previous frame from the outside in the frame memory and outputting the same to the timing controller; Outputting, by the timing controller, a vertical synchronizing signal for indicating the start and end of one frame, and a horizontal synchronizing signal and a data signal for driving the liquid crystal panel horizontally divided up and down during the vertical synchronizing to a gate driver and a data driver; Wow, Alternately driving the corresponding gate lines of the upper and lower parts in accordance with the horizontal division driving of the liquid crystal panel by using the gate driver; Outputting a data signal of R.G.B.color to a plurality of data lines while applying a horizontal synchronizing signal according to the horizontal division driving of the liquid crystal panel using the data driver; And sequentially outputting turn-on signals to a plurality of fluorescent lamps divided into two groups according to the horizontal division driving of the liquid crystal panel in order to irradiate the transmitted light from the rear surfaces of the upper and lower parts of the liquid crystal panel. Driving method. The method of claim 3, wherein The driving signal of the upper first gate line of the liquid crystal panel is generated by a logical product operation of a gate start pulse and a clock signal input from the outside, and the driving signal of the lower first gate line of the liquid crystal panel is the gate start pulse and the And generating the exclusive OR operation of the clock signal. According to an external drive signal and an image signal, a plurality of liquid crystal panels for displaying an image by controlling a liquid crystal formed between upper and lower substrates are horizontally driven, and a plurality of fluorescent lamps disposed on the rear surface of the liquid crystal panel according to the horizontal division driving. A driving method of a liquid crystal display, characterized in that for driving each divided by sequentially. The method of claim 5, The plurality of fluorescent lamps are divided into two regions, the first and second regions being sequentially driven by simultaneously driving one fluorescent lamp corresponding to the first region and one fluorescent lamp corresponding to the second region in one frame. A method of driving a liquid crystal display device, characterized in that. The method of claim 5, And the plurality of fluorescent lamps are driven at a time of 2 x frame / n (where n is the number of fluorescent lamps).