KR20080032424A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) device is provided to compensate luminance of a corresponding area by analyzing a luminance profile according to areas where lamps are located on an LC panel, thereby improving overall luminance uniformity of the LC panel. A backlight unit(110) divides an LC panel(102) into at least two or more areas, and has at least two or more lamps(120a~120e) arranged in the divided areas to be corresponded. A luminance measuring unit(114) senses luminance in the arrangement direction of the lamps. A luminance analyzing unit(116) classifies the luminance, sensed by the luminance measuring unit, into luminance profiles according the plural areas. A lamp controller(118) generates luminance compensation control data for controlling intensity of light of the plural lamps located in each area by using the luminance by an area analyzed in the luminance analyzing unit.

Description

Liquid crystal display device

1 is a view showing a conventional liquid crystal display device.

FIG. 2 is a schematic view of the backlight unit of FIG. 1; FIG.

3 is a view showing a liquid crystal display device according to a first embodiment of the present invention.

4 is a view showing a liquid crystal display device according to a second embodiment of the present invention.

5 is a view showing a liquid crystal display device according to a third embodiment of the present invention.

<Brief description of the main parts of the drawing>

102, 202, 302: Liquid crystal panel 104, 204, 304: Gate driver

106, 206, 306: Data driver 108, 208, 308: Timing controller

110, 210, 310: Backlight unit

112a to 112e, 212a to 212e, and 312a to 312e: first to fifth lamp driving units

114, 214, 314: luminance measurement unit 116, 216, 316: luminance analysis unit

118: luminance compensation lookup table

120a to 120e, 220a to 220e, 320a to 320e: first to fifth lamps

130a-130d, 230a-230d, 330a-330d: first to fourth partition walls

218: gamma voltage data compensation unit 222: DAC

318: data conversion 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 compensating for brightness by including a luminance compensation unit.

Liquid crystal display device (Liquid crystal display device) is a trend that the application range is gradually widened due to the characteristics such as light weight, thin, low power consumption. In accordance with this trend, the liquid crystal display device is used for office automation equipment, audio / video equipment, and the like. On the other hand, the liquid crystal display device displays the desired image on the screen by adjusting the transmission amount of the light beam according to the image signal applied to the plurality of control switches arranged in a matrix form.

Liquid crystal display devices having such a configuration are being replaced from cathode ray tube (CRT) displays due to their characteristics of thin type and low power consumption. Background of this replacement is a technological innovation in improving the image quality of the liquid crystal display. In particular, there is a strong demand for moving picture display represented by television images in recent years, and improvements have been made by liquid crystal materials and driving methods.

However, since the cathode ray tube (CRT) is an impulse type light emission by scanning an electron gun, the liquid crystal display device is a hold type light emission using a backlight system using a linear lamp (fluorescent lamp) as an illumination light source, so that complete moving picture display is difficult. In other words, when moving images are displayed by the liquid crystal display device, so-called motion blurring (deterioration of the image outline) occurs due to the holding characteristic, and image quality is deteriorated.

Accordingly, a liquid crystal display device according to a backlight sequential driving method using a direct type backlight in which a plurality of lamps are arranged horizontally in order to prevent motion blur (motion image contour deterioration) of a moving image display has been disclosed.

The liquid crystal display according to the backlight sequential driving method turns on a plurality of lamps in synchronization with the start time of the scanning signal of the display image, and when the same level of luminance signal is supplied, the display luminance of the liquid crystal panel is between each frame. By making the time integral of the values equal, impulse light emission (lighting) equivalent to that of the cathode ray tube (CRT) prevents the deterioration of the moving image contour in moving image display.

1 is a view showing a conventional liquid crystal display device.

As shown in FIG. 1, a conventional liquid crystal display device includes a liquid crystal panel 2 in which a plurality of gate lines GL1 to GLn and data lines DL1 to DLm cross each other, and a thin film transistor TFT is formed at an intersection thereof. And a gate driver 4 for supplying a gate scan signal to the gate lines GL1 to GLn of the liquid crystal panel 2, and for supplying data to the data lines DL1 to DLm of the liquid crystal panel 2. A data driver 6, a backlight unit 10 for irradiating light to the liquid crystal panel 2, a lamp driver 12 for controlling the backlight unit 10, the gate driver 4, and data A timing controller 8 for controlling the driver 6 and driving the lamp driver 12 is provided.

As illustrated in FIG. 2, the backlight unit 10 includes a plurality of lamps 30, a reflector 22 surrounding the plurality of lamps 30, and a diffusion covering the front surface of the reflector 22. The plate 20 is provided. A plurality of partitions 26 are formed between the plurality of lamps 30. The plurality of partitions 26 serve to divide the boundary of the plurality of lamps 30.

The plurality of lamps 30 are sequentially driven in response to the control of the lamp driver 12. The reflection plate 22 wraps the plurality of lamps 30 and propagates the light from the plurality of lamps 30 toward the diffusion plate 20. The diffusion plate 20 allows the light emitted from the plurality of lamps 30 to propagate toward the liquid crystal panel 2 and to be incident at a wide range of angles.

The plurality of partitions 26 are used to minimize optical interference of adjacent lamps.

In the case of the liquid crystal cell between the plurality of lamps 30, in addition to the lamp 30 disposed directly below the liquid crystal cell, a part of the light irradiated from the other lamp 30 is transmitted through the composite.

As a result, after the data voltage charged in each of the liquid crystal cells is completely charged, light from the lamp 30 disposed under the liquid crystal cell must be transmitted to display a desired image. The lamp 30 disposed under the liquid crystal cell In addition, the light irradiated from the other lamps 30 is transmitted to display an unwanted image.

In order to prevent this, the plurality of partitions 26 may be provided between the plurality of lamps 30 to minimize optical interference of adjacent lamps.

On the other hand, as the plurality of partitions 26 are provided between the plurality of lamps 30, the luminance of the boundary divided by the plurality of partitions 26 is generated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device and a driving method thereof capable of compensating luminance in a portion where luminance decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device and a method of driving the same, which make the luminance uniform.

The liquid crystal display according to the first embodiment of the present invention for achieving the above object has a liquid crystal panel and at least two or more lamps are divided into at least two regions and corresponding to the divided regions. A luminance analyzer for detecting a luminance in a direction in which the backlight unit, the lamp is arranged, a luminance analyzer for dividing the luminance detected by the luminance measurer into the plurality of luminance profiles for each region, and an area analyzed by the luminance analyzer And a lamp controller configured to generate luminance compensation control data for controlling the intensity of light of the plurality of lamps positioned in each region by using the respective luminance.

According to a second exemplary embodiment of the present invention, a liquid crystal panel includes a plurality of gate lines and a plurality of data lines, and divides the liquid crystal panel into at least two regions, and divides the divided regions. A backlight unit having at least two lamps disposed corresponding to the light sources, a data driver for driving the plurality of data lines, a luminance measuring unit for sensing luminance in an arrangement direction of the lamps, and the luminance measuring unit Supplying the data driver a gamma voltage set whose level scale varies according to the area of the liquid crystal panel by using the luminance analyzer for dividing the luminance into the plurality of luminance profiles for each region and the luminance profile for each region supplied from the luminance analyzer. According to the area of the liquid crystal panel, the data voltage to be written in the liquid crystal cell It also comprises an adaptive gamma voltage generator to be compensated for.

According to a third exemplary embodiment of the present invention, a liquid crystal panel including a plurality of gate lines and a plurality of data lines is arranged, and the liquid crystal panel is divided into at least two regions, and the divided regions. A backlight unit having at least two lamps disposed corresponding to the plurality of lamps, a data driver for driving the plurality of data lines, a luminance measuring unit for sensing luminance in an arrangement direction of the lamps, and the luminance measuring unit The data voltage to be written in the liquid crystal cell on the liquid crystal panel according to the area of the liquid crystal panel using the luminance analyzer for dividing the luminance into the plurality of luminance profiles for each region and the luminance profile for each region supplied from the luminance analyzer. Is converted into a data voltage compensated for luminance differently according to And a data converter.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

3 is a view showing a liquid crystal display device according to a first embodiment of the present invention.

As shown in FIG. 3, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal panel 102 in which a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm are arranged. A gate driver 104 driving the plurality of gate lines GL1 to GLn, a data driver 106 driving the plurality of data lines DL1 to DLm, and a gate driver 104 and a data driver. Timing controller 108 for controlling 106, a plurality of lamps 120a to 120e for generating light, and first to fifth lamp drivers 112a to 112e for driving the plurality of lamps 120a to 120e. ) And a backlight unit 110 that irradiates the liquid crystal panel 102 with light generated by the plurality of lamps 120a to 102e.

In addition, the LCD according to the present invention includes a luminance measuring unit 114 measuring luminance of the liquid crystal panel 102, a luminance analyzing unit 116 analyzing the luminance measured by the luminance measuring unit 114, and And a luminance compensation lookup table 118 in which compensation data for compensating luminance analyzed by the luminance analyzer 116 is stored.

A plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm are arranged in the liquid crystal panel 102, and a thin film transistor TFT, which is a switching element, and a thin film transistor TFT at an intersection thereof. The connected pixel electrode is formed.

The gate driver 104 sequentially supplies gate scan signals to the plurality of gate lines GL1 to GLn according to a gate control signal supplied from the timing controller 108.

The data driver 106 supplies a data voltage to the plurality of data lines DL1 to DLm according to a data control signal supplied from the timing controller 108.

The timing controller 108 controls the gate driver 104 by using the vertical / horizontal synchronization signal Vsync / Hsync, the data enable signal DE, and the clock signal CLK supplied from a system (not shown). A gate control signal and a data control signal for controlling the data driver 106 are generated.

The backlight unit 110 includes first to fifth lamps 120a to 120e, and first to fourth partitions 130a to 130d are formed between the first to fifth lamps 120a to 120e. It is. The first to fifth lamps 120a to 120e are driven by lamp driving voltages supplied from the first to fifth lamp drivers 112a to 112e.

The first to fourth barrier ribs 130a to 130d serve to minimize optical interference of adjacent lamps between the first to fifth lamps 120a to 120e.

The first to fifth lamp drivers 112a to 112e control the lighting time of the first to fifth lamps 120a to 120e according to the luminance compensation control data supplied from the luminance compensation lookup table 118.

The luminance measuring unit 114 detects the luminance in the vertical direction of the liquid crystal panel 102. The luminance measuring unit 114 may be, for example, a luminance sensor or a photodiode. The luminance measuring unit 114 detects a luminance profile in the vertical direction of the liquid crystal panel 102.

The luminance analyzer 116 divides the luminance profile detected by the luminance measurer 114 into regions in which the first to fifth lamps 120a to 120e are positioned on the liquid crystal panel 102. The luminance profile is analyzed for each region.

Specifically, the luminance analyzer 116 divides the luminance profile detected by the luminance measurer 114 into first to fifth regions of the liquid crystal panel 102, and is supplied from the timing controller 108. The horizontal sync signal Hsync is counted to detect that the lamp corresponding to any one of the first to fifth regions is driven.

The luminance analyzer 116 detects that a lamp corresponding to any one of the first to fifth regions of the liquid crystal panel 102 is driven, and generates a luminance profile corresponding to the region where the lamp is to be driven. Supply to compensation lookup table 118.

The luminance compensation lookup table 118 stores luminance compensation control data corresponding to the luminance profile of the first to fifth regions in which the first to fifth lamps 120a to 120e of the liquid crystal panel 102 are located. .

The luminance compensation control data stored in the luminance compensation lookup table 118 increases luminance in areas where luminance decreases and decreases regions where luminance is high so that the luminance of the first to fifth regions on the liquid crystal panel 102 is generally increased. Data that adjusts the intensity of light to make it uniform.

The luminance compensation lookup table 118 uses the luminance profile of the corresponding region supplied from the luminance analyzer 116 to output luminance compensation control data corresponding to the luminance profile of the corresponding region from the first to fifth lamp drivers. 112a to 112e) is supplied to the lamp driving unit for driving the lamp corresponding to the area.

For example, when the luminance profile corresponding to the third area is supplied from the luminance analyzer 116 to the luminance lookup table 118, the luminance compensation lookup table 118 may correspond to the luminance profile corresponding to the third area. Outputs luminance compensation control data corresponding thereto. As described above, the luminance compensation control data is data for controlling the intensity of light of the third lamp 120c corresponding to the third region.

Therefore, the luminance compensation control data output from the luminance compensation lookup table 118 is supplied to the third lamp driver 112c to control the intensity of the light of the third lamp 120c.

As such, the intensity of light of the first to fifth lamps 120a to 120e is controlled by the luminance compensation control data output from the luminance compensation lookup table 118. The luminance of five regions can be made uniform.

As described above, the liquid crystal display according to the present invention detects the luminance in the vertical direction of the liquid crystal panel and analyzes the detected luminance profile for each region in which the lamp is located on the liquid crystal panel and generates luminance compensation control data for each region. By controlling the intensity of the light of the lamp corresponding to the area, the luminance of the liquid crystal panel can be made uniform.

4 is a view showing a liquid crystal display device according to a second embodiment of the present invention.

As shown in FIG. 4, in the liquid crystal display according to the second exemplary embodiment, a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm are arranged to display a predetermined image. A panel 202, a gate driver 204 for driving the plurality of gate lines GL1 to GLn, a data driver 206 for driving the plurality of data lines DL1 to DLm, and the gate driver ( 204 and the timing controller 208 for controlling the data driver 206, the first to fifth lamps 220a to 220e for generating light, and the first to fifth lamps 220a to 220e. And a backlight unit 210 for irradiating light to the liquid crystal panel 202 and first to fifth lamp drivers 212a to 212e for driving the first to fifth lamps 220a to 220e.

In addition, the liquid crystal display according to the present invention includes a luminance measuring unit 214 for detecting the luminance in the vertical axis direction of the liquid crystal panel 202 and a luminance analyzer for analyzing the luminance detected by the luminance measuring unit 214. 216, a gamma voltage data compensator 218 for compensating gamma voltage data of the liquid crystal panel 202 using the luminance analyzed by the brightness analyzer 216, and a gamma voltage data compensator 218. DAC 222 for converting the gamma voltage data output from the analog voltage to an analog voltage.

In the description of the liquid crystal display device according to the second embodiment of the present invention, the same parts as those of the liquid crystal display device according to the first embodiment of the present invention described above will be briefly described.

The liquid crystal panel 202 is divided into regions in which the first to fifth lamps 220a to 220e are located. Since the first to fifth lamps 220a to 220e are five in total, the liquid crystal panel 202 may be divided into first to fifth regions.

The backlight unit 210 includes first to fourth partitions 230a to 230d between the first to fifth lamps 220a to 220e. The first to fourth partitions 230a to 230d are to minimize interference of light generated from adjacent lamps.

Therefore, if the boundary portion of the first to fifth lamps 220a to 220e is correctly formed, the luminance may be lowered at portions where the first to fourth partitions 230a to 230d are provided compared to other portions.

The luminance measuring unit 214 senses the luminance in the vertical direction of the liquid crystal panel 202. The luminance measuring unit 214 may be, for example, a luminance sensor or a photodiode. The luminance measuring unit 214 detects a luminance profile in the vertical direction of the liquid crystal panel 202.

The luminance analyzer 216 divides the luminance profile detected by the luminance measuring unit 214 for each region in which the first to fifth lamps 220a to 220e are positioned on the liquid crystal panel 202, thereby separating each region. Analyze the luminance profile by time.

Specifically, the luminance analyzer 216 divides the luminance profile detected by the luminance measurer 214 into first to fifth regions of the liquid crystal panel 202, and is supplied from the timing controller 208. The horizontal sync signal Hsync is counted to determine which area of the first to fifth areas the data is to be displayed.

The luminance analyzer 216 detects which region of the first to fifth regions of the liquid crystal panel 202 to display data, and transmits a luminance profile corresponding to the region to the gamma voltage data compensator 218. Supply.

The gamma voltage data compensator 218 stores a gamma voltage data set corresponding to the luminance profile of the first to fifth regions in which the first to fifth lamps 220a to 220e of the liquid crystal panel 202 are located. have.

The gamma voltage data set stored in the gamma voltage data compensator 218 increases the brightness of the lower brightness area and lowers the high brightness area of the gamma voltage data compensator 218. Data that equalizes luminance.

The gamma voltage data compensator 218 supplies a gamma voltage data set corresponding to the luminance profile of each region supplied from the luminance analyzer 216 to the digital-to-analog converter 222. The DAC 222 converts the gamma voltage data supplied from the gamma voltage data compensator 218 into an analog and supplies the converted gamma voltage to the data driver 206.

The data driver 206 uses the gamma voltage supplied from the DAC 222 to data to be displayed from the timing controller 208 on the liquid crystal panel 202 according to the first to fifth regions. The luminance is converted into the data voltage having been compensated for luminance and supplied to the corresponding region of the liquid crystal panel 202.

Accordingly, since the gamma voltage data output from the gamma voltage data compensator 218 compensates for the data to be displayed in the first to fifth regions of the liquid crystal panel 202, the first gamma voltage data of the liquid crystal panel 202 may be used. Luminance of the fifth to fifth regions may be uniform.

As described above, the liquid crystal display according to the present invention detects the luminance in the vertical direction of the liquid crystal panel and analyzes the detected luminance profile for each region where the lamp is located on the liquid crystal panel and uses gamma voltage data with luminance compensation for each region. By converting the data to be displayed for each area, the luminance of the liquid crystal panel can be made uniform.

5 is a diagram illustrating a liquid crystal display according to a third exemplary embodiment of the present invention.

As shown in FIG. 5, in the liquid crystal display according to the third exemplary embodiment, a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm are arranged to display a predetermined image. A liquid crystal panel 302, a gate driver 304 for driving the plurality of gate lines GL1 to GLn, a data driver 306 for driving the plurality of data lines DL1 to DLm, and the gate driver The timing controller 308 for controlling the 304 and the data driver 306, the first to fifth lamps 320a to 320e for generating light, and the first to fifth lamps 320a to 320e. A backlight unit 310 for irradiating the generated light to the liquid crystal panel 302, and first to fifth lamp drivers 312a to 312e for driving the first to fifth lamps 320a to 320e. do.

In addition, the liquid crystal display according to the present invention includes the luminance measuring unit 314 for measuring the luminance of the liquid crystal panel 302 and the luminance of the liquid crystal panel 302 measured by the luminance measuring unit 314. To a fifth to third lamps 320a to 320e are analyzed by a luminance analyzer 316 and a data converter configured to generate modulation data for compensating luminance according to the analysis result of the luminance analyzer 316 ( 318) further.

The liquid crystal panel 302 may be divided according to areas in which the first to fifth lamps 320a to 320e of the backlight unit 310 are located. That is, the liquid crystal panel 302 includes a first region in which the first lamp 320a is located, a second region in which the second lamp 320b is located, and a third region in which the third lamp 320c is located. It may be divided into a third region, a fourth region in which the fourth lamp 320d is located, and a fifth region in which the fifth lamp 320e is located.

First and fourth barrier ribs 330a to 330d may be formed in the backlight unit 310 to minimize optical interference of adjacent lamps. The first to fourth partitions 330a to 330d are positioned between the first to fifth lamps 320a to 320e.

The first to fifth lamp drivers 312a to 312e correspond to the first to fifth lamps 320a to 320e to drive the first to fifth lamps 320a to 320e. The first to fifth lamp drivers 312a to 312e control the lighting time of the first to fifth lamps 320a to 320e according to the lamp control signal supplied from the timing controller 308.

As the first to fourth partitions 330a to 330d are positioned between the first to fifth lamps 320a to 320e, the luminance of the boundary of the first to fifth lamps 320a to 320e is lowered.

The luminance measuring unit 314 senses the luminance in the vertical direction of the liquid crystal panel 302. The luminance measuring unit 314 may be, for example, a luminance sensor or a photodiode. The luminance measuring unit 314 detects a luminance profile in the vertical direction of the liquid crystal panel 302.

The luminance analyzer 316 divides the luminance profile detected by the luminance measuring unit 314 for each region in which the first to fifth lamps 320a to 320e are positioned on the liquid crystal panel 302, thereby separating each region. Analyze the luminance profile by time.

In detail, the luminance analyzer 316 divides the luminance profile detected by the luminance measurer 314 into first to fifth regions of the liquid crystal panel 302, and is supplied from the timing controller 308. The horizontal sync signal Hsync is counted to determine which area of the first to fifth areas the data is to be displayed.

The luminance analyzer 316 detects which region of the first to fifth regions of the liquid crystal panel 302 to display data and supplies the luminance profile corresponding to the region to the data converter 318. .

The data converter 318 converts data corresponding to the region supplied from the timing controller 308 to luminance compensation by using the luminance profile corresponding to the region supplied from the luminance analyzer 316. Supply to data driver 306.

The data converter 318 includes at least two lookup tables in which different sets of luminance-compensated modulated data are stored. In addition, the data converter 318 selects a lookup table corresponding to the region by using the luminance profile of each region supplied from the luminance analyzer.

The data converter 318 converts data to be recorded in a liquid crystal cell on the liquid crystal panel 302 into luminance compensation modulated data on the selected lookup table according to an area of the liquid crystal panel 302. To supply.

Therefore, the data converter 318 recognizes an area of the liquid crystal panel 302 through a brightness profile corresponding to one area supplied from the brightness analyzer 316 and compensates for the data to be displayed in the area. The data is converted into one data and output to the data driver 306.

The luminance compensated data supplied to the data driver 306 is supplied to the first to fifth regions on the liquid crystal panel 302 and displayed as an image to compensate for the luminance.

Therefore, the luminance compensation data output from the data converter 318 compensates for the data to be displayed in the first to fifth regions of the liquid crystal panel 302, and thus, the first to the first to the second liquid crystal panels 202. The luminance of five regions can be made uniform.

As described above, the liquid crystal display according to the present invention detects the luminance in the longitudinal direction of the liquid crystal panel and analyzes the detected luminance profile for each region where the lamp is located on the liquid crystal panel and supplies luminance compensated data for each region. The luminance of the liquid crystal panel can be made uniform.

As mentioned above, the liquid crystal display according to the present invention can improve the overall luminance uniformity of the liquid crystal panel by analyzing the luminance profile for each region in which the lamp is positioned on the liquid crystal panel to compensate for the luminance of the corresponding region.

As described above, in the liquid crystal display according to the present invention, the data conversion or the gamma voltage conversion and the lighting time of a portion where luminance decrease occurs as partition walls are used between lamps in order to minimize optical interference of adjacent lamps. By using a method such as controlling the luminance, the luminance of the portion where the luminance decreases can be compensated.

In addition, the liquid crystal display according to the present invention can improve the overall luminance uniformity of the liquid crystal panel by compensating for the luminance of the region where the luminance decreases.

Although the present invention has been described with reference to the embodiments, those skilled in the art may variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. You will understand.

Claims (12)

A liquid crystal panel; A backlight unit that divides the liquid crystal panel into at least two regions and has at least two lamps disposed corresponding to the divided regions; A luminance measuring unit which senses luminance in an arrangement direction of the lamp; A luminance analyzer dividing the luminance sensed by the luminance measurer into the plurality of luminance profiles for each region; And And a lamp controller configured to generate luminance compensation control data for controlling the intensity of light of a plurality of lamps located in each region by using the luminance of each region analyzed by the luminance analyzer. The method of claim 1, The luminance analyzer divides the luminance sensed by the luminance measuring unit into the plurality of regions, counts a synchronization signal supplied from the outside, and outputs the luminance profile divided by the regions to the luminance compensator. . The method of claim 1, The luminance measuring unit includes a luminance sensor and a photo diode. The method of claim 1, The lamp control unit, A luminance compensation lookup table storing luminance compensation control data for controlling the intensity of light of the lamp to compensate for luminance according to each region by using the luminance profile for each region supplied from the luminance analyzer; And And a lamp driver for controlling the intensity of light of the lamp according to luminance compensation control data supplied from the luminance compensation lookup table. A liquid crystal panel in which a plurality of gate lines and a plurality of data lines are arranged; A backlight unit that divides the liquid crystal panel into at least two regions and has at least two lamps disposed corresponding to the divided regions; A data driver driving the plurality of data lines; A luminance measuring unit which senses luminance in an arrangement direction of the lamp; A luminance analyzer dividing the luminance sensed by the luminance measurer into the plurality of luminance profiles for each region; And The data voltage to be written in the liquid crystal cell is different depending on the area of the liquid crystal panel by supplying the data driver a gamma voltage set whose level scale varies according to the area of the liquid crystal panel using the luminance profile for each region supplied from the luminance analyzer. And an adaptive gamma voltage generator configured to compensate for luminance at a ratio. The method of claim 5, The luminance analyzer divides the luminance sensed by the luminance measuring unit into the plurality of regions, counts a synchronization signal supplied from the outside, and outputs the luminance profile divided by the regions to the gamma voltage data compensator. Display. The method of claim 5, The luminance measuring unit includes a luminance sensor and a photo diode. The method of claim 5, The adaptive gamma voltage generator, A gamma voltage data compensator for storing a gamma voltage data set having a different level scale according to an area of the liquid crystal panel and outputting a gamma voltage data set corresponding to a luminance profile of each region supplied from the luminance analyzer; And And a digital-to-analog converter converting gamma voltage data output from the gamma voltage data compensator into analog and supplying the analog data to the data driver. A liquid crystal panel in which a plurality of gate lines and a plurality of data lines are arranged; A backlight unit that divides the liquid crystal panel into at least two regions and has at least two lamps disposed corresponding to the divided regions; A data driver driving the plurality of data lines; A luminance measuring unit which senses luminance in an arrangement direction of the lamp; A luminance analyzer dividing the luminance sensed by the luminance measurer into the plurality of luminance profiles for each region; And The data voltage to be written in the liquid crystal cell on the liquid crystal panel according to the area of the liquid crystal panel is converted into the data voltage which is luminance compensated differently according to the area by using the luminance profile for each region supplied from the luminance analyzer. And a data conversion unit for supplying. The method of claim 9, The luminance analyzer divides the luminance sensed by the luminance measuring unit into the plurality of regions, counts a synchronization signal supplied from the outside, and outputs the luminance profile divided by the regions to the data converter. . The method of claim 9, The luminance measuring unit includes a luminance sensor and a photo diode. The method of claim 9, The data converter includes at least two look-up tables storing differently compensated luminance data sets, and selects a look-up table corresponding to the area by using a luminance profile for each region supplied from the luminance analyzer. And converting data to be recorded in the liquid crystal cell on the liquid crystal panel into luminance compensation modulation data on the selected lookup table according to the area of the panel, and supplying the data to the data driver.

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