KR20070115537A - Lcd and drive method thereof - Google Patents

Abstract

An LCD(Liquid Crystal Display) device and a diving method thereof are provided to reduce power consumption by alternately driving a part of plural lamps when images are displayed. An LCD panel includes a first display area having first data lines and a second display area having second data lines. Plural lamps(261-268) radiates beams to the LCD panel. A timing controller(220) controls drive timing of the first and second display areas and operation of the plural lamps by supplying digital data. First and second data drivers convert the digital data to an analog data voltage and supply the converted voltage to the first and second data lines, respectively. A switching unit(280) alternately supplies a lamp driving voltage to the lamps by controlling a switching direction through the timing controller.

Description

Liquid crystal display and driving method thereof

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

2 is a block diagram of a conventional liquid crystal display device.

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

4A to 4D are exemplary views illustrating an arrangement structure of first and second display regions of the liquid crystal display panel of FIG. 3.

5 is a detailed block diagram of the backlight assembly and the switching unit of FIG. 3.

6a to 6c are views illustrating the use of the liquid crystal display device according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100, 200: liquid crystal display device 110, 210: liquid crystal display panel

120: data driver 130, 250: gate driver

140: gamma reference voltage generator 150, 260: backlight assembly

160, 270: inverter 170: common voltage generator

180: gate driving voltage generation unit 190, 220: timing controller

230: first data driver 240: second data driver

280: switching unit

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 selectively driving a plurality of lamps while simultaneously displaying a screen displayed on the liquid crystal display panel into two display areas. It is about.

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 configuration of a conventional liquid crystal display device having pixels having such a structure will be described with reference to FIG. 2.

2 is a block diagram of a conventional liquid crystal display device.

Referring to FIG. 2, the liquid crystal display 100 according to the related art includes a thin film transistor for driving the liquid crystal cell Clc at the intersection of the data lines DL1 to DLm and the gate lines GL1 to GLn. TFT: a thin film transistor (110) having a thin film transistor (110), a data driver (120) for supplying data to the data lines (DL1 to DLm) of the liquid crystal display panel 110, the liquid crystal display panel 110 A gate driver 130 for supplying scan pulses to the gate lines GL1 to GLn of the gate lines, a gamma reference voltage generator 140 for generating a gamma reference voltage and supplying it to the data driver 120, and a liquid crystal display panel The backlight assembly 150 for irradiating light to the 110, the inverter 160 for applying an alternating voltage and current to the backlight assembly 150, and the common voltage Vcom are generated to generate the liquid crystal display panel 110. The common voltage generator 170 for supplying the common electrode of the liquid crystal cell Clc Controlling the gate driver voltage generator 180, the data driver 120, and the gate driver 130 to generate and supply the gate high voltage VGH and the gate low voltage VGL to the gate driver 130. A timing controller 190 is provided.

In the liquid crystal display panel 110, liquid crystal is injected 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 electrodes of the TFTs are connected to the gate lines GL1 to GLn, and the source electrodes of the TFTs are 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 the scan pulse supplied to the gate terminal via the gate lines GL1 to GLn. When the TFT is turned on, video data on the data lines DL1 to DLm 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. (RGB) is sampled and latched, and then converted into an analog data voltage capable of expressing gray scales in the liquid crystal cell Clc of the liquid crystal display panel 110 based on the gamma reference voltage supplied from the gamma reference voltage generator 140. To be supplied to the data lines DL1 to DLm.

The gate driver 130 sequentially generates scan pulses, that is, gate pulses, in response to the gate driving control signal GDC and the gate shift clock GSC supplied from the timing controller 190, thereby providing the gate lines GL1 to GLn. To feed. In this case, the gate driver 130 determines the high level voltage and the low level voltage of the scan pulse based on the gate high voltage VGH and the gate low voltage VGL supplied from the gate driving voltage generator 180.

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 a burst dimming signal determined according to an internal square wave signal is generated, a driving IC (not shown) for controlling the generation of AC voltage and current in the inverter 160 is supplied to the backlight assembly 150 according to the burst dimming signal. Control the generation of alternating voltage and current.

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 in this way 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 digital video data RGB, which is supplied from an image processing scaler (not shown) included in a system such as a television receiver or a computer monitor, to the data driver 120, and also provides a clock signal CLK. The data driving control signal DDC and the gate driving control signal GDC are generated using the horizontal / vertical synchronizing signals H and V and supplied to the data driver 120 and the gate driver 130, respectively. 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 a gate driving control signal GDC. ) Includes a gate start pulse (GSP) and a gate output enable (GOE).

In the conventional liquid crystal display having such a configuration and function, since the liquid crystal display panel 110 has only one display area, when displaying an image for a computer, the liquid crystal display panel 110 displays an image on the entire screen and the backlight assembly 150. By driving all the lamps (not shown) provided at the same time, there is a problem of unnecessary power consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to separate a screen displayed on a liquid crystal display panel into two display areas and to selectively display a plurality of lamps simultaneously. There is provided a liquid crystal display and a driving method thereof.

An object of the present invention is to separate the screen displayed on the liquid crystal display panel into two display areas and to selectively display a plurality of lamps at the same time, thereby reducing the power consumption when displaying a computer image, etc. There is provided a liquid crystal display and a driving method thereof.

In order to achieve the above object, the present invention has a first display area and a second display area, wherein a plurality of first data lines are formed in the first display area, and a plurality of second data lines are formed in the second display area. A liquid crystal display panel formed; A plurality of lamps for irradiating light onto the liquid crystal display panel; A timing controller for supplying digital data to control driving timing of the first and second display regions and controlling driving of the plurality of lamps; A first data driver configured to convert the digital data into an analog data voltage and supply the digital data to the plurality of first data lines; A second data driver for converting the digital data into an analog data voltage to supply the plurality of second data lines; And a switching unit configured to control a switching direction by the timing controller to selectively supply a lamp driving voltage to the plurality of lamps.

The timing controller may simultaneously supply the digital data to the first and second data drivers so that the first and second display regions are simultaneously driven.

The timing controller supplies the digital data only to the first data driver so that only the first display area is driven.

The timing controller supplies the digital data only to the second data driver so that only the second display area is driven.

The switching unit includes a plurality of switches that receive the lamp driving voltage through one side and the other side thereof is connected in a one-to-one correspondence with the plurality of lamps.

Only some of the plurality of switches are turned on by the timing controller to switch the lamp driving voltage to one of the plurality of lamps connected thereto.

The plurality of switches are turned on by the timing controller to switch the lamp driving voltage to a lamp connected to itself among the plurality of lamps.

The timing controller controls driving of the plurality of lamps by controlling a switching direction of the switching unit according to a user command, and controls driving of the first and second display areas.

The present invention provides a liquid crystal display panel including a plurality of data lines and a plurality of gate lines; A plurality of lamps for irradiating light onto the liquid crystal display panel; A timing controller for controlling the driving of the plurality of lamps; And a switching unit configured to control a switching direction by the timing controller to selectively supply a lamp driving voltage to the plurality of lamps.

The present invention provides a method of driving a liquid crystal display device having a liquid crystal display panel having first and second display regions and a plurality of lamps for irradiating light to the liquid crystal display panel, wherein the digital data is supplied and the lamp driving voltage is supplied. Generating a; When a control command for instructing to drive both the first and second display regions is input, the digital data is converted into analog data to be supplied to the first and second display regions, and the lamp driving voltage is simultaneously supplied to the plurality of display regions. Supplying lamps; When a control command for instructing to drive only one display area among the first and second display areas is input, the digital data is converted into analog data and supplied only to one display area of the first and second display areas. And simultaneously supplying the lamp driving voltage to only some of the plurality of lamps.

A driving method of a liquid crystal display device comprising a liquid crystal display panel and a plurality of lamps for irradiating light to the liquid crystal display panel, the method comprising: generating a lamp driving voltage; Supplying the lamp driving voltage to the plurality of lamps when a control command for instructing to display only a part of the entire screen of the LCD panel is input; And supplying the lamp driving voltage to only some of the plurality of lamps when a control command for instructing to display the entire screen of the liquid crystal display panel is input.

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

3 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention. 3, the gamma reference voltage generator 140, the common voltage generator 170, and the same as the liquid crystal display device 100 shown in FIG. 2. Although the gate driving voltage generator 180 is provided, these components are not shown in FIG. 3 for convenience of description.

Referring to FIG. 3, the liquid crystal display 200 of the present invention has a first display area and a second display area, and includes a plurality of data lines DL1-1 through DL1-m and a plurality of data lines in the first display area. The gate lines GL1 through GLn intersect with each other, and pixels are formed in the intersection regions, and the plurality of data lines DL2-1 through DL2-m and the plurality of gate lines GL1 through GL2 are formed in the second display area. A liquid crystal display panel 210 in which GLn is crossed and pixels are formed in the intersection regions, a timing controller 220 for supplying RGB data to control driving timing of the first and second display regions, and a timing controller. The first data driver 230 for converting the RGB data input from the 220 into an analog data voltage and supplying the data to the plurality of data lines DL1-1 to DL1-m and the timing controller 220. Convert RGB data into analog data voltage Scan pulses are sequentially supplied to the plurality of gate lines GL1 to GLn under the control of the second data driver 240 and the timing controller 220 to supply the lines DL2-1 to DL2-m. A gate driver 250 is provided for the purpose.

In addition, the liquid crystal display device 200 of the present invention includes a backlight assembly 260 having a plurality of lamps for irradiating light to the liquid crystal display panel 110 and an alternating voltage and current applied to the backlight assembly 260. The switching direction is controlled by the inverter 270 and the timing controller 220 to selectively supply the AC voltage and current from the inverter 260 to the plurality of lamps.

In addition, the liquid crystal display 200 of the present invention further includes a user input unit 290 for inputting a user command for driving the first and second display regions and a user command for selectively driving the plurality of lamps. do.

The display area of the liquid crystal display panel 110 is divided into first and second display areas in which screens having the same resolution are displayed. However, the present invention may be implemented such that screens having different resolutions are displayed on the first and second display areas, for example, the low resolution screen is displayed on the first display area and the high resolution screen is displayed on the second display area. Can be implemented.

A plurality of data lines DL1-1 to DL1-m and a plurality of gate lines GL1 to GLn intersect each other in the first display area, and pixels are formed in the intersection areas, respectively, and subpixels of the pixel. A thin film transistor (TFT) for driving the liquid crystal cell Clc is formed therein. Here, the pixels formed in the first display area include R subpixels, G subpixels, and B subpixels. In particular, the R subpixels, the G subpixels, and the B subpixels are arranged in a stripe type to form one pixel.

A plurality of data lines DL2-1 to DL2-m and a plurality of gate lines GL1 to GLn intersect each other in the second display area, and pixels are formed in the intersection areas, respectively, and subpixels of the pixel. A thin film transistor for driving the liquid crystal cell Clc is formed therein. Here, the pixels formed in the first display area include R subpixels, G subpixels, and B subpixels. In particular, the R subpixels, the G subpixels, and the B subpixels are arranged in a stripe type to form one pixel.

The present invention drives the first and second display regions simultaneously when displaying a television image, but alternatively drives only the first display region or the second display region when displaying a computer image.

In the present invention, the first and second display areas are separated from side to side as shown in FIG. 4A, and the first and second display areas are separated 1: 1. However, the present invention is not limited thereto.

As another example, the first and second display areas may be divided up and down as shown in FIG. 4B.

As another example, the first display area may be disposed at an edge portion of the second display area as shown in FIG. 4C.

As another example, the first display area may be symmetrically formed on the left and right sides of the second display area as shown in FIG. 4D.

The timing controller 220 receives the first video driver 230 and / or the second data driver 240 from the digital video data supplied from an image processing scaler (not shown) included in a system such as a television receiver or a computer monitor. And a data driving control signal DDC using the horizontal / vertical synchronizing signals H and V according to the clock signal CLK to generate a first data driver 230 and / or a second data driver ( 240, the gate driving control signal GDC and the gate shift clock GSC are generated and supplied to the gate driver 250. 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 a gate driving control signal GDC. ) Includes a gate start pulse (GSP) and a gate output enable (GOE).

When a control command for outputting a television image to the first and second display areas is input through the user input unit 270, the timing controller 220 may convert the digital RGB data into the first and second data drivers 230 and 240. The switching direction of the switching unit 280 is controlled so that the AC voltage and the current supplied from the inverter 270 are simultaneously supplied to all lamps of the backlight assembly 260.

When a control command for outputting a computer image is input through the user input unit 270, the timing controller 220 may alternatively supply digital RGB data to the first data driver 230 or the second data driver 240. At the same time, the switching voltage of the switching unit 280 is controlled so that the AC voltage and the current supplied from the inverter 270 are supplied to only some of the plurality of lamps.

The first data driver 230 supplies data to the data lines DL1-1 to DL1-m in response to the data driving control signal DDC supplied from the timing controller 220, where the timing controller 220 is used. Sampling and latching the digital RGB data supplied from the digital RGB data, and converting the digital RGB data into an analog data voltage capable of expressing gray scales in the liquid crystal cell Clc of the first display area based on the gamma reference voltage supplied from the gamma reference voltage generator 140. To be supplied to the data lines DL1-1 to DL1-m.

The second data driver 240 supplies data to the data lines DL2-1 to DL2-m in response to the data driving control signal DDC supplied from the timing controller 220, where the timing controller 220 is used. Sampling and latching the digital RGB data supplied from the digital RGB data, and converting the digital RGB data from the gamma reference voltage generator 140 into an analog data voltage capable of expressing gray scales in the liquid crystal cell Clc of the second display area. To be supplied to the data lines DL2-1 to DL2-m.

The gate driver 250 sequentially generates scan pulses in response to the gate driving control signal GDC and the gate shift clock GSC supplied from the timing controller 220 and supplies them to the gate lines GL1 to GLn.

As shown in FIG. 5, the backlight assembly 260 includes the first to eighth lamps 261 to 268 that are spaced at regular intervals and aligned in the vertical direction. However, the backlight assembly 260 is not limited thereto. . The first to eighth lamps 261 to 268 are spaced apart from the rear surface of the liquid crystal display panel 210.

The inverter 270 converts a 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 determined according to the square wave signal therein, the AC voltage and the current supplied to the backlight assembly 260 are generated according to the burst dimming signal.

The switching unit 280 is the first switch 281, one side is connected to the inverter 270, the other side is commonly connected to the first and second lamps 261, 262, one side is connected to the inverter 270, the other side is A second switch 282 commonly connected to the third and fourth lamps 263 and 264, and a third connected to the inverter 270 on one side and commonly connected to the fifth and sixth lamps 265 and 266 on the other side. A switch 283 and a fourth switch 284 connected at one side to the inverter 270 and connected at the other side to the seventh and eighth lamps 267 and 268 in common. The first to fourth switches 281 to 284 are controlled on / off by the timing controller 220. However, the timing controller 220 may include a switch for driving the first and second lamps 261 and 262 and a switch for driving the first switch 281 and a switch for driving the third and fourth lamps 263 and 264. 282, the switch for driving the fifth and sixth lamps 265 and 266 are the third switch 283, and the switch for driving the seventh and eighth lamps 267 and 268 is the fourth switch 284. Is stored in advance, and the information is used to control the on / off of the first to fourth switches 281 to 284.

When displaying an image for a television, the timing controller 220 turns on all of the first to fourth switches 281 to 284 so that all of the first to eighth lamps 261 to 268 are driven, thereby providing liquid crystals. The entire screen of the display panel 210 is displayed.

When displaying an image for a computer, the timing controller 220 turns on only two switches of the first to fourth switches 281 to 284 and turns off the other two switches to turn the first to eighth. Since only some of the lamps 261 to 268 are driven, only some screens of the entire screen of the liquid crystal display panel 210 are displayed.

For example, when the first and second switches 281 and 282 are turned off and the third and fourth switches 283 and 284 are turned on, the first to fourth lamps 261 to 264 are shown as shown in FIG. 6A. Is turned off and the fifth to eighth lamps 265 to 268 are driven to display only a part of the entire screen of the liquid crystal display panel 210.

As another example, when the first and fourth switches 281 and 284 are turned off and the second and third switches 282 and 283 are turned on, the first and second lamps 261 and 262 as shown in FIG. 6B. ) And the seventh and eighth lamps 267 and 268 are turned off, and the third to sixth lamps 263 to 266 are driven to display only a part of the entire screen of the liquid crystal display panel 210.

As another example, when all of the first to fourth switches 281 to 284 are turned on, as shown in FIG. 6C, all of the first to eighth lamps 261 to 268 are driven to operate the liquid crystal display panel 210. The entire screen is displayed.

As such, when only a few of the plurality of lamps are driven when displaying an image for a computer, the present invention can reduce the power consumption by the lamps in half compared to the conventional technology of driving all of the plurality of lamps.

As described above, the present invention separates the screen displayed on the liquid crystal display panel into two display areas, selectively displays the plurality of lamps, and selectively drives a plurality of lamps, thereby reducing power consumption when displaying an image for a computer. Can be saved.

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 (15)

A liquid crystal display panel having first and second display areas, wherein a plurality of first data lines are formed in the first display area and a plurality of second data lines are formed in the second display area; A plurality of lamps for irradiating light onto the liquid crystal display panel; A timing controller for supplying digital data to control driving timing of the first and second display regions and controlling driving of the plurality of lamps; A first data driver configured to convert the digital data into an analog data voltage and supply the digital data to the plurality of first data lines; A second data driver for converting the digital data into an analog data voltage to supply the plurality of second data lines; And A switching unit for controlling the switching direction by the timing controller to selectively supply a lamp driving voltage to the plurality of lamps Liquid crystal display comprising a. The method of claim 1, And the timing controller simultaneously supplies the digital data to the first and second data drivers so that the first and second display regions are simultaneously driven. The method of claim 1, And the timing controller supplies the digital data only to the first data driver so that only the first display area is driven. The method of claim 1, And the timing controller supplies the digital data only to the second data driver so that only the second display area is driven. The method of claim 1, The switching unit, A plurality of switches are applied to the lamp driving voltage through one side and the other side is connected in a one-to-one correspondence to the plurality of lamps Liquid crystal display comprising a. The method of claim 5, And only some of the plurality of switches are turned on by the timing controller to switch the lamp driving voltage to a lamp connected to itself among the plurality of lamps. The method of claim 5, And the plurality of switches are turned on by the timing controller to switch the lamp driving voltage to a lamp connected to itself among the plurality of lamps. The method according to any one of claims 1 to 7, And the timing controller controls driving of the plurality of lamps and controls driving of the first and second display areas by controlling the switching direction of the switching unit according to a user command. A liquid crystal display panel in which a plurality of data lines and a plurality of gate lines are formed; A plurality of lamps for irradiating light onto the liquid crystal display panel; A timing controller for controlling the driving of the plurality of lamps; And A switching unit for controlling the switching direction by the timing controller to selectively supply a lamp driving voltage to the plurality of lamps Liquid crystal display comprising a. The method of claim 9, The switching unit, A plurality of switches are applied to the lamp driving voltage through one side and the other side is connected in a one-to-one correspondence to the plurality of lamps Liquid crystal display comprising a. The method of claim 10, Only some of the plurality of switches are turned on by the timing controller to switch the lamp driving voltage to one of the plurality of lamps connected thereto. The method of claim 10, And the plurality of switches are turned on by the timing controller to switch the lamp driving voltage to a lamp connected to itself among the plurality of lamps. The method according to any one of claims 9 to 12, And the timing controller controls driving of the plurality of lamps by controlling a switching direction of the switching unit according to a user command. A driving method of a liquid crystal display device comprising a liquid crystal display panel having a first display area and a second display area, and a plurality of lamps for irradiating light to the liquid crystal display panel. Supplying digital data and generating a lamp driving voltage; When a control command for instructing to drive both the first and second display regions is input, the digital data is converted into analog data to be supplied to the first and second display regions, and the lamp driving voltage is simultaneously supplied to the plurality of display regions. Supplying lamps; When a control command for instructing to drive only one display area among the first and second display areas is input, the digital data is converted into analog data and supplied only to one display area of the first and second display areas. Simultaneously supplying the lamp drive voltage to only some of the plurality of lamps; Method of driving a liquid crystal display comprising a. A driving method of a liquid crystal display device having a liquid crystal display panel and a plurality of lamps for irradiating light to the liquid crystal display panel, Generating a lamp driving voltage; Supplying the lamp driving voltage to the plurality of lamps when a control command for displaying only a part of the screens of the entire LCD screen is input; And Supplying the lamp driving voltage to only some of the plurality of lamps when a control command for instructing to display the entire screen of the liquid crystal display panel is input; Method of driving a liquid crystal display comprising a.

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