KR20090060065A - Liquid crystal display apparatus and driving method thereof - Google Patents

Abstract

A liquid crystal display apparatus and a driving method thereof are provided to reduce an error between a source image signal and an image signal to be displayed by compensating a comma voltage of image data according to comparison value of a source image data and a real image data. A timing controller arranges image data inputted from the outside and supplies it to data driver(150), and it controls a data driver, a gate driver, and a voltage generating unit, and then the image data to an image data correction unit. An image detection unit detects an image displayed on the liquid crystal panel and supplies the detected image data to an image correction unit, and it compares image data inputted from a timing controller and the detected image data to correct them according to a compassion result. A gamma voltage generator(130) generates a gamma voltage according to the image data from the image correction unit and supplies it to the data driver.

Description

Liquid crystal display apparatus and driving method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a driving method thereof. In particular, a liquid crystal display device and a driving method thereof capable of improving an image quality by detecting an image displayed on a liquid crystal panel and correcting an error of the image displayed on the liquid crystal panel. It is about.

In recent information society, display devices are more important than ever as visual information transmission media, and many kinds of flat panel displays have been developed.

The flat panel display device includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an electroluminescence (EL). .

In general, the liquid crystal display device has a trend that the application range is gradually widened due to the characteristics such as light weight, thin, low power consumption. In line with this trend, liquid crystal displays are being used as portable computers such as notebook PCs, office automation equipment, audio / video equipment, and indoor / outdoor advertising display devices. It is developing rapidly.

Such a liquid crystal display apparatus displays an image by adjusting light transmittance of liquid crystal cells according to an input video signal.

1 is a block diagram showing a liquid crystal display device according to the prior art.

Referring to FIG. 1, the liquid crystal display device 1 according to the related art includes a liquid crystal panel 20, in which liquid crystal cells are arranged in a matrix form between two glass substrates, to display an image, and light to the liquid crystal panel 20. And a driving device (30, 40, 50, 60, 70) for applying a driving signal for driving the backlight unit (10) for irradiating the liquid crystal panel (20).

The driving device of the liquid crystal display device 1 includes a gate driver 60 mounted with a plurality of gate driver ICs 62 which sequentially supply gate driving signals to each of the gate lines GL1 to GLn formed in the liquid crystal panel 20. ) And a data driver 50 mounted with a plurality of data drive ICs 52 for supplying the analog image data R, G, and B to the data lines DL1 to DLm so as to be synchronized with the gate driving signal (scan signal). ) And digital image data (R, G, B) input from the outside are aligned and supplied to the data driver 50, and the data driver 50, the gate driver 60, and the voltage generator 40 are driven. A timing controller 70 for controlling the voltage, a gamma voltage generator 30 for supplying a reference gamma voltage to the data driver 50, and a voltage generator for supplying driving power to each of the driving apparatuses of the backlight unit 10 described above. 40 is comprised.

The timing controller 70 arranges the image data input from the outside to be suitable for driving the liquid crystal panel 20 and supplies the image data to the data driver 50. In addition, the timing controller 70 uses a gate clock signal GCS and a data control signal using a dot clock DLCK, a data enable signal DE, and horizontal and vertical synchronization signals Hsync and Vsync. DCS) is generated to control driving timing of each of the data driver 50 and the gate driver 60.

The gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC, and a gate output enable GOE. The data control signal DCS includes a source start pulse (SSP), a source shift clock signal (SSC), a source output signal (SOE), and a polarity signal (POL). Included.

Gate driver 60 includes a plurality of gate driver ICs 62. The gate driver IC 62 includes a shift register that sequentially generates the gate driving signal in response to the gate control signal GCS from the timing controller 70. The gate driver IC 62 sequentially applies the gate driving signals to the gate lines GL1 to GLn in response to the gate control signal GCS input from the timing controller 70, thereby providing the respective gate lines GL1 to GLn. Turn on the TFT connected to GLn).

The data driver 50 includes a plurality of data drive ICs 52. The plurality of data drive ICs 52 convert the digital image data supplied from the timing controller 70 into an analog image signal in response to the data control signal DCS supplied from the timing controller 70, and the gate line GL1. The analog image signal corresponding to the line is supplied to the data lines DL1 to DLm every time the gate driving signal is supplied to the ... GLn.

In this case, the data drive IC 52 may invert the polarity of the analog image signals supplied to the data lines DL1 to DLm in response to the polarity control signal POL supplied from the timing controller 70.

The gamma voltage generator 30 buffers the reference gamma voltage generator 32 generating the reference gamma voltage and the reference gamma voltage generated by the reference gamma voltage generator 32 to output the stabilized reference gamma voltage. A gamma buffer IC 34 is provided.

The reference gamma voltage generator 32 has a plurality of resistors R1 to Rj connected in series between the supply voltage source VDD and the ground voltage source GND. A plurality of levels of reference gamma voltages GMA having different voltage values are generated at nodes between the plurality of resistors R1 to Rj. Accordingly, the reference gamma voltage generator 32 divides the supply voltage input from the supply voltage source VDD into a plurality of stages using the plurality of resistors R1 to Rj to supply the gamma buffer IC 34.

The gamma buffer IC 34 is constituted by an untapped voltage follower connected to the output line of the reference gamma voltage generator 32 in series. The voltage follower serves to buffer and stabilize the reference gamma voltages GMA. The buffered plurality of reference gamma voltages GMA are supplied to the plurality of data driver ICs 52 of the data driver 50.

Here, the gamma voltage generator 30 and the plurality of data driver ICs 52 are electrically connected by a plurality of Tape Carrier Packages (TCP), which are not shown, and the output terminal of the gamma buffer IC 34. Each of the plurality of transmission lines (not shown) for transmitting the reference gamma voltage is formed. Accordingly, the reference gamma voltages GMA buffered in the gamma buffer IC 34 are supplied to each of the plurality of data driver ICs 52 via the plurality of gamma voltage transmission lines and the plurality of TCPs.

In general, gamma refers to a slope of a luminance special curve and a deviation of a luminance value according to a voltage level output from an output terminal of the data drive IC 52. The gamma voltage generator 30 of the general liquid crystal display device 1 should accurately select the gamma resistor values R1 to Rj in order to generate a desired gamma voltage value, as well as the gamma resistor and the gamma buffer IC 34. In addition, a capacitor is further provided at the input and output terminals of the gamma power supply to generate a stable reference gamma voltage.

As such, the liquid crystal display device 1 converts the digital image data output from the timing controller 70 into analog image data in the data drive IC 52, and converts the converted analog image data into data lines DL1 to DLm. Is supplied to the LCD panel 20 to display a desired image. At this time, the data drive IC 52 converts the digital image data into analog image data using the positive and negative reference gamma voltages supplied from the gamma voltage generator 30 as a reference voltage, and supplies the digital image data to the liquid crystal panel. 20) displays an image using the supplied analog image data.

The liquid crystal display for displaying an image by using the image data input by such a configuration, the source image data and the actual liquid crystal input from the outside in accordance with the characteristics of the light source and the liquid crystal panel 20 of the backlight unit 10 during operation An error occurs in the image displayed on the panel. In more detail, when the liquid crystal display is driven for a long time, the liquid crystal panel 40 is degraded by the heat generated during the driving, and distortion is generated in the image to be displayed. Such distortion of the image may degrade the display quality of the liquid crystal display.

In addition, when the liquid crystal display is driven for a long time, characteristics of the light source LED supplying light are changed, thereby causing an error in luminance originally intended to be displayed. The luminance error generated by the light source changes the amount of light irradiated onto the liquid crystal panel 40, causing a difference between the source image data input from the outside and the image represented in the actual liquid crystal panel, thereby reducing the display quality of the liquid crystal display device. Thrown away.

As shown in FIG. 2, LEDs 12 and 14 emitting color light of red (R), green (G), and blue (B) to correct an error of the display image according to the characteristic change of the light source due to such heat. 16) A method of correcting an image displayed on a liquid crystal panel by adjusting driving voltages supplied to each has been proposed in US Pat. No. 6,334,641 B1.

However, such a correction method requires a plurality of LED light sources 12, 14, and 16 disposed on the backlight unit 10 to be controlled individually or in an array unit, thereby limiting errors in the display image. There is a demand for a new method for correcting an image.

In a liquid crystal display that displays an image by using the input image data, an error occurs between the source image data input from the outside and the image displayed on the actual liquid crystal panel according to the characteristics of the light source and the liquid crystal panel of the backlight unit during driving. . When the liquid crystal display is driven for a long time, the liquid crystal panel is degraded by the heat generated during the driving, and distortion is generated in the image to be displayed. Such distortion of the image may degrade the display quality of the liquid crystal display.

In addition, when the liquid crystal display is driven for a long time, characteristics of the light source LED supplying light are changed, thereby causing an error in luminance originally intended to be displayed. The luminance error generated by the light source changes the amount of light irradiated onto the liquid crystal panel, causing a difference between the source image data input from the outside and the image represented in the actual liquid crystal panel, thereby lowering the display quality of the liquid crystal display.

In order to solve the above problems, the present invention is to provide a liquid crystal display and a driving method that can improve the display quality of the liquid crystal display by reducing the error between the source image data input from the outside and the image displayed on the liquid crystal panel do.

According to an exemplary embodiment of the present invention, a liquid crystal panel for displaying an image by adjusting a light transmittance of a liquid crystal according to input image data, and a plurality of gate lines formed in the liquid crystal panel A gate driver for sequentially supplying a gate driving signal to each other, a data driver for supplying an image signal to each of the plurality of data lines formed in the liquid crystal panel in synchronization with the gate driving signal, and image data input from the outside Supply to the data driver; A timing controller for controlling the driving of the data driver, the gate driver, and the voltage generator and supplying image data to the image correction unit, an image displayed on the liquid crystal panel, and detecting the detected image data to the image correction unit. An image correction unit for comparing the image detection unit to be supplied with the image data input from the timing controller and the detected image data input from the image detection unit, and correcting an error between the two image data according to the comparison result; And a gamma voltage generator for generating a gamma voltage according to the image data input from the image corrector and supplying the gamma voltage to the data driver, and a backlight unit for supplying light to the liquid crystal panel.

A driving method of a liquid crystal display device according to an exemplary embodiment of the present invention is a driving method of a liquid crystal display device which corrects an image displayed on a liquid crystal panel by being distorted from source image data, wherein the image data displayed on the liquid crystal panel is detected. And comparing the detected image data with the source image data to determine whether the source image data matches the detected image data and to determine an error value, and wherein the detected image data and the source image data are determined. Generating a corrected image data by generating a correction value according to an error value of, generating a gamma voltage using the corrected image data, and converting the image data according to the gamma voltage to convert the image data. Characterized in that comprises the step of supplying.

The liquid crystal display according to an exemplary embodiment of the present invention generates a reference gamma voltage (GMA) of red (R), green (G), and blue (B) according to the corrected image data value input from the image corrector. Supply to the data driver. The data driver converts the digital image data input according to the gamma voltage input from the gamma voltage generator into analog image data and supplies the analog image data to the liquid crystal panel to display the corrected image.

The liquid crystal display according to an exemplary embodiment of the present invention continuously compares the source image data with the actual image data displayed on the liquid crystal panel and corrects the gamma voltage (GMA) of the image data according to the comparison value, thereby inputting the input source image signal. The display quality of the LCD may be improved by reducing the error of the image displayed on the LCD panel.

Hereinafter, the technical objects and features of the present invention will be apparent from the description of the accompanying drawings and the embodiments. Looking at the present invention in detail.

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

Referring to FIG. 3, the liquid crystal display device 100 according to an exemplary embodiment of the present invention includes a liquid crystal panel 120 in which liquid crystal cells are arranged in a matrix form between two glass substrates to display an image, and a liquid crystal panel 120. Driving devices 130, 140, 150, 160, 170, and 190 for applying a driving signal and a driving voltage for driving the backlight unit 110 and the liquid crystal panel 120 that irradiate light to the liquid crystal panel 120. It is configured to include an image detection unit 180 for detecting the image displayed in the (detection).

The liquid crystal panel 120 includes a spacer (not shown) for injecting liquid crystal between the upper substrate and the lower substrate and maintaining a constant gap between the upper substrate and the lower substrate. The upper substrate of the liquid crystal panel 120 includes a color filter, a common electrode, a black matrix, and the like, which are not shown.

In addition, a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn are formed on the lower substrate of the liquid crystal panel 120, and data lines DL1 to DLm and gate lines GL1 are formed. TFT is formed at the intersection of ˜GLn). The TFT supplies the analog image signal from the data lines DL1 to DLm to the liquid crystal cell in response to the gate driving signal (scan signal) from the gate lines GL1 to GLn.

Since the liquid crystal cell includes a common electrode facing each other with a liquid crystal interposed therebetween and a pixel electrode connected to the TFT, the liquid crystal cell may be equivalently represented as a liquid crystal capacitor Clc. The liquid crystal cell includes a storage capacity Cst for maintaining the analog image signal charged in the liquid crystal capacitor Clc until the next analog image signal is charged.

The driving devices 130, 140, 150, 160, 170, and 190 of the liquid crystal display device 100 according to an exemplary embodiment of the present invention drive gates to each of the gate lines GL1 to GLn formed in the liquid crystal panel 120. The gate driver 160 mounted with a plurality of gate driver ICs 162 for sequentially supplying signals and the data lines DL1 to synchronously synchronize the analog image data R, G, and B with the gate driving signal (scan signal). The data driver 150 mounted with a plurality of data drive ICs 52 to be supplied to the DLm and the digital image data R, G, and B inputted from the outside are arranged and supplied to the data driver 150. The timing controller 170 controls the driving of the data driver 50, the gate driver 160, and the voltage generator 140, and supplies the source image data input from the outside to the image correction unit 190. Supply the reference gamma voltage to the data driver 150 Detects an image displayed on the gamma voltage generator 130, the voltage generator 140 supplying driving power to each of the above-mentioned driving unit of the backlight unit 110, and the image displayed on the liquid crystal panel 120, and detects the detected image. Comparing the image detection unit 180 for transmitting the data to the image correction unit 190 to be described later, the source image data input from the timing controller 170 and the detected image data input from the image detection unit 180, And an image calibration unit 190 for correcting an error between the two image data according to the comparison result.

The timing controller 170 arranges the image data input from the outside to be suitable for driving the liquid crystal panel 120 and supplies the image data to the data driver 150 and the image corrector 190. In addition, the timing controller 170 uses a gate clock signal GCS and a data control signal using a dot clock DLCK, a data enable signal DE, and horizontal and vertical synchronization signals Hsync and Vsync. DCS) is generated to control driving timing of each of the data driver 150 and the gate driver 160.

The gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC, and a gate output enable GOE. The data control signal DCS includes a source start pulse (SSP), a source shift clock signal (SSC), a source output signal (SOE), and a polarity signal (POL). Included.

Gate driver 160 includes a plurality of gate driver ICs 162. The gate driver IC 162 includes a shift register that sequentially generates the gate driving signal in response to the gate control signal GCS from the timing controller 170. The gate driver IC 162 sequentially applies the gate driving signals to the gate lines GL1 to GLn in response to the gate control signal GCS input from the timing controller 170, thereby providing the respective gate lines GL1 to GLn. Turn on the TFT connected to GLn).

The data driver 150 includes a plurality of data drive ICs 152. The plurality of data drive ICs 152 convert the digital image data supplied from the timing controller 170 into an analog image signal in response to the data control signal DCS supplied from the timing controller 170, and the gate line GL1. The analog image signal corresponding to the line is supplied to the data lines DL1 to DLm every time the gate driving signal is supplied to the ... GLn.

Each of the plurality of data drive ICs 52 receives a control signal and digital image data from the timing controller 170 and supplies a signal controller to each driver, a shift register unit for supplying a sequential sampling signal, and a sampling signal. A latch unit for sequentially latching and simultaneously outputting digital image data, a digital / analog converter 152d for converting digital image data from the latch unit into analog image data, and analog image data input from a digital / analog converter. It is configured to include an output buffer that is buffered and output to the liquid crystal panel 120.

In addition, the data drive IC 152 may invert the polarity of the analog image signal supplied to the data lines DL1 to DLm in response to the polarity control signal POL supplied from the timing controller 170.

The gamma voltage generator 130 generates a reference gamma voltage using a voltage input under the control of the timing controller 170 and a correction value of the image data input from the image corrector 190. 132 and a gamma buffer IC 134 for buffering the reference gamma voltage generated by the reference gamma voltage generator 132 to output the stabilized reference gamma voltage.

Here, the reference gamma voltage generator 132 generates a reference gamma voltage using the image data input from the image corrector 190 by correcting the image data value. That is, the reference gamma voltage corrected using the input source image data value and the correction value of the image data input from the image corrector 190 is generated and supplied to the gamma buffer IC 134.

The reference gamma voltage generator 132 includes a plurality of resistors R1 to Rj connected in series between the supply voltage source VDD and the base voltage source GND. A plurality of levels of reference gamma voltages GMA having different voltage values are generated at nodes between the plurality of resistors R1 to Rj. Accordingly, the reference gamma voltage generator 132 divides the supply voltage input from the supply voltage source VDD into a plurality of stages using the plurality of resistors R1 to Rj to supply the gamma buffer IC 134.

The gamma buffer IC 134 is composed of an untapped voltage follower connected to the output line of the reference gamma voltage generator 132 in series. The voltage follower serves to buffer and stabilize the reference gamma voltages GMA. The buffered plurality of reference gamma voltages GMA are supplied to the plurality of data driver ICs 152 of the data driver 150.

Here, the gamma voltage generation unit 130 and the plurality of data driver ICs 152 are electrically connected by a plurality of Tape Carrier Packages (TCP), not shown, and the output terminal of the gamma buffer IC 134. Each of the plurality of transmission lines (not shown) for transmitting the reference gamma voltage is formed. Accordingly, the reference gamma voltages GMA buffered in the gamma buffer IC 134 are supplied to each of the plurality of data driver ICs 152 via the plurality of gamma voltage transmission lines and the plurality of TCPs.

Gamma refers to the inclination of the luminance specific curve and the deviation of the luminance value according to the voltage level output from the output terminal of the data drive IC 152. The data drive IC 52 is a digital image from the timing controller 170. The data is converted into analog image data according to the input gamma value and supplied to the liquid crystal panel 120.

To this end, the gamma voltage generator 130 must accurately select the values of the gamma resistors R1 to Rj in order to generate a desired gamma voltage value, and not only the gamma resistance and the gamma buffer IC 34 but also a stable reference gamma. Capacitors are additionally provided at the input and output terminals of the gamma power supply to generate voltage.

The liquid crystal display device 100 converts the digital image data output from the timing controller 170 into analog image data in the data drive IC 152, and converts the converted analog image data into data lines DL1 to DLm. Is supplied to the LCD panel 120 to display a desired image. In this case, the data drive IC 152 converts the digital image data into analog image data using the positive and negative reference gamma voltages GMA supplied from the gamma voltage generator 130 as reference voltages, thereby converting the digital image data into analog image data. The plurality of data lines DL1 to DLm formed at 120 are supplied, and the liquid crystal panel 120 displays an image using the supplied analog image data.

The voltage generator 140 generates a voltage necessary for driving the liquid crystal panel 120 using a power supply voltage supplied from the outside according to a control signal from the timing controller 170, and supplies the generated voltage to each device driving. The voltage generator 140 may include an inverter for supplying a driving voltage to a plurality of light sources (fluorescent lamps, LEDs) of the backlight unit 110, and a common voltage generator for supplying a common voltage to a common electrode of the liquid crystal panel 120. Include.

The image detector 180 includes one or more image sensors for detecting an image displayed on the liquid crystal panel 120, and a data controller for aligning and transmitting image data detected by the image sensor.

The image detector 180 displays an image displayed on the liquid crystal panel 120 in units of red (R), green (G), and blue (B), or a pixel array unit of red (R), and green. The image correction unit 190 is detected by a pixel array unit expressing (G), a pixel array unit expressing blue (G), or a predetermined area unit on the liquid crystal panel 120, and converts and sorts the detected image into digital data. ).

The image corrector 190 may include a source image memory unit for storing source image data input from the timing controller 170, a detection image memory unit for storing detection image data detected and input from the image detector unit 180, and a source; An image data comparison unit comparing the source image data stored in the image memory unit and the detected image data stored in the detection image memory unit with each other, an image data operation unit calculating an error value of the image data according to a comparison result of the image data comparison unit; The transmission unit transmits the correction value of the image data corrected by the operation of the image data operation unit to the gamma voltage generator 130.

The image corrector 190 compares an error between the source image data input from the timing controller 170 and the detected image data input from the image detector 180.

If there is no error between the two image data, since the image displayed on the liquid crystal panel 120 displays the source image data first input without error, the source image data and the liquid crystal panel 120 do not perform an operation according to the error. Notify that the displayed video data matches. That is, the gamma voltage generator 130 generates the reference gamma voltage as the image data input from the timing controller 170.

On the other hand, the image correction unit 190 compares the source image data input from the timing controller 170 and the detection image data input from the image detector 180, and if an error occurs between the two image data, shown in FIG. As described above, a correction value for correcting an error in the source image data of each of red (R), green (G), and blue (B) input from the timing controller 170 is calculated. Thereafter, the image data corrected by reflecting the correction value is generated in the image data input from the timing controller 170 and supplied to the gamma voltage generator 130.

The gamma voltage generator 130 generates reference gamma voltages GMA of red (R), green (G), and blue (B) according to the corrected image data values input from the image corrector 190. Supply to the data driver 150.

The data driver 150 converts the digital image data input from the timing controller 170 into analog image data according to the gamma voltage input from the gamma voltage generator 130 and supplies the analog image data to the liquid crystal panel 120 to correct the image. Will be displayed.

As described above, the liquid crystal display device 100 according to an exemplary embodiment of the present invention continuously compares the source image data with the actual image data displayed on the liquid crystal panel 120 and according to the comparison value, the gamma voltage of the image data ( By correcting the GMA, the display quality of the liquid crystal display may be improved by reducing an error between the input source image signal and the image displayed on the liquid crystal panel 120.

In FIGS. 3 and 4 and the foregoing description, the image correction unit 190 is configured as a separate driving device and a driving method is described. However, the image correction unit 190 is not configured separately, and the timing controller 170 or the gamma voltage generator 130 may be included as a component.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a block diagram showing a liquid crystal display device according to the prior art.

FIG. 2 is a diagram illustrating a backlight unit shown in FIG. 1. FIG.

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

4 is a view showing an image correction method of a liquid crystal display according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 100: liquid crystal display device 10, 110: backlight unit

20, 120: liquid crystal panel 30, 130: gamma voltage generator

40, 140: voltage generator 50, 150: data driver

60, 160: gate driver 70, 170: timing controller

180: image detector 190: image correction unit

Claims (12)

A liquid crystal panel which displays an image by adjusting the light transmittance of the liquid crystal according to the input image data; A gate driver sequentially supplying a gate driving signal to each of the plurality of gate lines formed in the liquid crystal panel; A data driver configured to supply an image signal to each of a plurality of data lines formed in the liquid crystal panel in synchronization with the gate driving signal; Sorting and supplying image data input from the outside to the data driver; A timing controller which controls the driving of the data driver, the gate driver and the voltage generator, and supplies the image data to the image correction unit; An image detector which detects an image displayed on the liquid crystal panel and supplies the detected image data to the image correction unit; An image correction unit for comparing the image data input from the timing controller with the detected image data input from the image detection unit, and correcting an error between the two image data according to the comparison result; A gamma voltage generation unit generating a gamma voltage according to the image data input from the image correction unit and supplying the gamma voltage to the data driver; And a backlight unit for supplying light to the liquid crystal panel. The method of claim 1, The image detector includes one or more image sensors for detecting an image displayed on the liquid crystal panel; And a data controller for aligning and transmitting the image data detected by the image sensor. The method of claim 2, And the image detection unit detects an image displayed on the liquid crystal panel in each pixel unit representing red (R), green (G), and blue (B). The method of claim 2, The image detector detects an image displayed on the liquid crystal panel in a pixel array unit representing red (R), a pixel array unit representing green (G), and a pixel array unit representing blue (G). Liquid crystal display device. The method of claim 2, And the image detector detects an image displayed on the liquid crystal panel in a predetermined area unit. The method of claim 1, The image corrector may include a first memory unit configured to store image data input from the timing controller; A second memory unit configured to store detected image data detected and input from the image detector; An image data comparison unit comparing the image data stored in the first memory unit with the detected image data stored in the second memory unit; An image data calculating unit calculating an error value of the image data according to a comparison result of the image data comparing unit; And a transmission unit which transmits a correction value of the image data corrected by the operation of the image data operation unit to the gamma voltage generator. A driving method of a liquid crystal display device which corrects an image displayed on a liquid crystal panel by being distorted from source image data. Detecting image data displayed on the liquid crystal panel; Comparing the detected image data with the source image data to determine whether the source image data matches the detected image data and determine an error value; Generating a corrected image data by generating a correction value according to an error value between the detected image data and the source image data; Generating a gamma voltage using the corrected image data; And converting the image data according to the gamma voltage and supplying the image data to the liquid crystal panel. The method of claim 7, wherein Detecting the image data, Detects an image displayed on the liquid crystal panel using one or more image sensors, And aligning and transmitting the image data detected by the image sensor. The method of claim 8, Detecting the image data, And detecting an image displayed on the liquid crystal panel in units of pixels representing red (R), green (G), and blue (B). The method of claim 8, Detecting the image data, An image displayed on the liquid crystal panel is detected by a pixel array unit expressing red (R), a pixel array unit expressing green (G), and a pixel array unit expressing blue (G) Driving method of the device The method of claim 8, Detecting the image data, And a method for detecting an image displayed on the liquid crystal panel in units of a predetermined area. The method of claim 7, wherein Storing image data input from the timing controller in a first memory unit; Storing detection image data detected and input from the image detection unit, in a second memory unit; Comparing the image data stored in the first memory unit with the detected image data stored in the second memory unit; Calculating an error value of the image data according to a result of comparing the two image data; And generating a correction value of the image data by the operation.

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