KR20070022547A - Electron Emission Display Device and driving method thereof - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an electron emission display device and a method of driving the same, which compensates for luminance unevenness of each pixel so as to improve the quality of an image.

According to an exemplary embodiment of the present invention, a pixel unit includes a plurality of pixels emitting light by applying a predetermined voltage to a first electrode and a second electrode by a data signal and a scan signal, and generate a data signal by receiving an image signal. The plurality of data drivers using the data driver, a scan driver to generate the scan signal, and transmit the scan signal to the pixel unit; a timing controller to control operations of the data driver and the scan driver; and a compensation coefficient corresponding to each of the plurality of pixels. And a luminance compensator for compensating the image signal transmitted to each pixel of the pixel, wherein the luminance compensator multiplies each compensation coefficient by the image signal to compensate for the image signal. The maximum value of the compensation coefficient is 1; It is to provide a larger electron emitting display device.

Description

Electron emission display device and driving method thereof

1 is a structural diagram showing a structure of an electron emission display device according to the prior art.

2 is a view showing an example of an electron emission display device according to the present invention.

3 is a conceptual diagram illustrating a first embodiment in which luminance is compensated for in the electron emission display device illustrated in FIG. 2.

4 is a conceptual diagram illustrating a second embodiment in which luminance is compensated for in the electron emission display device illustrated in FIG. 2.

FIG. 5 is a diagram illustrating an embodiment of a compensation control unit employed in the electron emission display device of FIG. 3.

6 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 7 is a perspective view illustrating a pixel unit employed in the electron emission display device illustrated in FIG. 2.

FIG. 8 is a cross-sectional view illustrating a cross section of the pixel unit illustrated in FIG. 7.

*** Explanation of symbols on main parts of drawings ***

100: pixel portion 101: pixel

200: data driver 300: scan driver

400: timing controller 500: luminance compensator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron emission display device and a control method thereof, and more particularly, to an electron emission display device for controlling luminance characteristics in units of pixels in order to improve light emission irregularities of pixels.

In general, a flat panel display (FPD) is a device for manufacturing a container in a vacuum state by placing a sidewall between two substrates facing each other, and placing a suitable material inside the container to display a desired screen. The importance is increasing with the development of multimedia. In response to this, various flat displays such as liquid crystal displays (LCDs), plasma display panels (PDPs), electron emission displays, and the like have been developed and put into practical use.

In particular, the electron-emitting display device can be implemented as a flat panel display having low power consumption without distortion of the image while maintaining excellent characteristics of the cathode ray tube (CRT) by using a phenomenon in which the phosphor emits light by an electron beam like the cathode ray tube (CRT). It is likely to be attracting attention as a next-generation display that has great potential and satisfactory in terms of viewing angle, high-speed response, high brightness, high definition, and thinness.

In general, an electron emission device has a method using a hot cathode and a cold cathode as an electron source. The electron-emitting devices using the cold cathode are Field Emitter Array (FEA), Surface Conduction Emitter (SCE), Metal-Insulator-Metal (MIM), Metal-Insulator-Semiconductor (MIS), and BSE (Ballistic). electron surface emitting) and the like are known.

The FEA type electron emitting device uses a low work function or high β function as an electron emission source, and uses electrons to emit electrons by electric field in vacuum. In addition, devices using electron emission sources for nanomaterials have been developed.

The SCE type electron emission device is a device in which an electron emission part is formed by providing a conductive thin film between two electrodes disposed to face each other on a substrate and providing a micro crack in the conductive thin film. The device utilizes a principle that electrons are emitted from the electron emission portion, which is the fine gap, by applying a voltage to an electrode to flow a current to the surface of the conductive thin film.

The MIM type and MIS type electron emission devices each form an electron emission portion composed of a metal-dielectric layer-metal (MIM) and a metal-dielectric layer-semiconductor structure, and apply a voltage between two metals or a metal and a semiconductor disposed between dielectric layers. It is a device using the principle that electrons are released as they move and accelerate from a metal having a high electron potential or from a semiconductor to a metal having a low electron potential when applied.

The BSE type electron emitting device forms an electron supply layer made of a metal or a semiconductor on an ohmic electrode by using the principle that electrons travel without scattering when the size of the semiconductor is reduced to a dimension area smaller than the average free stroke of electrons in the semiconductor. And an insulating layer and a metal thin film formed on the electron supply layer to emit electrons by applying power to the ohmic electrode and the metal thin film.

Like the CRT (Cathode-Ray Tube), the electron-emitting device operates by cathode electrode ray emission (self-light source, high efficiency, high luminance and wide luminance region, natural color and high color purity, wide viewing angle), operating speed, Due to the advantage of lighting that the operating temperature range is wide, it can be used in various fields, and active research has been made until recently.

1 is a structural diagram showing a structure of an electron emission display device according to the prior art. Referring to FIG. 1, the electron emission display device includes a pixel unit 10, a data driver 20, a scan driver 30, and a timing controller 40.

In the pixel portion 10, a plurality of cathode electrodes C1, C2... Cn are arranged in a column direction, and a plurality of gate electrodes G1, G2... Gn are arranged in a row direction, and a cathode electrode C1. Each of the portions where C2..Cn and the gate electrodes G1, G2..Gn intersect, an electron emission section is provided to form the pixel 11. An anode electrode is formed on the front surface of the pixel portion so that electrons emitted from the electron emission portion collide with the front surface of the pixel portion. In addition, the gate electrodes G1, G2 .... Gn may be arranged in the column direction, and the cathode electrodes C1, C2 .... Cn may be arranged in the row direction. In the following description, it is assumed that the cathode electrodes C1, C2 .... Cn are arranged in the column direction and the gate electrodes G1, G2 .... Gn are arranged in the row direction.

The data driver 20 generates a data signal using an image signal and is connected to the cathode electrodes C1, C2 .... Cn to transfer the data signal to the cathode electrodes C1, C2 .... Cn. . The data driver 20 is an electrode for ON / OFF of the pixel 11 formed at the intersection of the selected cathode electrodes C1, C2 .... Cn and the gate electrodes G1, G2 ..... Gn. Generate a signal.

The scan driver 30 is connected to the gate electrodes G1, G2 .... Gn, and selects one gate electrode G1, G2 .... Gn of the plurality of gate electrodes arranged in the row direction to gate the gate. The scan signal is transmitted to the pixel 11 connected to the electrodes G1, G2 .... Gn.

The timing controller 40 transfers the data driver control signal and the scan driver control signal to the data driver 20 and the scan driver 30 to control the operations of the data driver 20 and the scan driver 30.

In the electron emission display device configured as described above, even if the same data signal and the scan signal are input due to the internal resistance of the gate electrode, the cathode electrode, the characteristics of the electron emission unit, and the like, there is a possibility that luminance unevenness in which the luminance of each pixel is differently expressed.

Accordingly, an object of the present invention is to solve the problems of the prior art, and an object of the present invention is to provide an electron emission display device and a driving method thereof, by which the quality of an image expressed by compensating luminance unevenness of each pixel is increased. It is.

In order to achieve the above object, a pixel unit including a plurality of pixels that emit light by applying a predetermined voltage to the first electrode and the second electrode by a data signal and a scan signal, and receives the image signal to generate the data signal. A data driver for transmitting the pixel driver, a scan driver for generating the scan signal, and transmitting the scan signal to the pixel driver; a timing controller for controlling operations of the data driver and the scan driver; and a compensation coefficient corresponding to each of the plurality of pixels. And a luminance compensator for compensating the image signal transmitted to each of the plurality of pixels, wherein the luminance compensator multiplies each compensation coefficient with the image signal to compensate for the image signal. The maximum value is to provide an electron emitting display element larger than one.

According to a second aspect of the present invention, a pixel unit including a plurality of pixels emitting light by applying a predetermined voltage to a first electrode and a second electrode by a data signal and a scan signal, and receives the image signal to generate the data signal A data driver to transmit the scan signal to the pixel unit, a scan driver to generate the scan signal, and transmit the scan signal to the pixel unit, a timing controller to control operations of the data driver and the scan driver, and a compensation coefficient corresponding to each of the plurality of pixels. A luminance compensator for compensating the image signal transmitted to each of the plurality of pixels by using a multiplier, and compensating the image signal by multiplying each compensation coefficient to the image signal. The maximum value of is to provide an electron emission display element smaller than one.

According to a third aspect of the present invention, there is provided a method of driving an electron emission display device for generating a data signal using an image signal and displaying an image corresponding to the data signal. Generating the data signal and measuring the luminance of each pixel based on the data signal; calculating a compensation coefficient for correcting the image signal based on the measured luminance, wherein a maximum value of the compensation coefficient is greater than one; Comprising the step of calculating to multiplied by the compensation coefficient to a predetermined image signal to provide a method of driving an electron emission display device characterized in that the compensation.

According to a fourth aspect of the present invention, there is provided a method of driving an electron emission display device for generating a data signal using an image signal and displaying an image corresponding to the data signal. Generating the data signal and measuring the luminance of each pixel based on the data signal; calculating a compensation coefficient for correcting the video signal based on the measured luminance, wherein a maximum value of the compensation coefficient is less than 1; Comprising the step of calculating to multiplied by the compensation coefficient to a predetermined image signal to provide a method of driving an electron emission display device characterized in that the compensation.

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.

2 is a view showing an example of an electron emission display device according to the present invention. Referring to FIG. 2, the electron emission display device according to the present invention includes a pixel unit 100, a scan driver 200, a data driver 300, a timing controller 400, and a luminance compensator 500. .

In the pixel unit 100, a plurality of cathode electrodes C1, C2... Cn are arranged in a column direction, and a plurality of gate electrodes G1, G2... Gn are arranged in a row direction, and a cathode electrode C1. Each of the portions where C2..Cn and the gate electrodes G1, G2..Gn intersect, an electron emission section is provided to form the pixel 101. In addition, the gate electrodes G1, G2 .... Gn may be arranged in the column direction, and the cathode electrodes C1, C2 .... Cn may be arranged in the row direction. In addition, an anode electrode in the pixel portion 100 may be formed over the entire area of the pixel portion 100. In the following description, it is assumed that the cathode electrodes C1, C2 .... Cn are arranged in the column direction and the gate electrodes G1, G2 .... Gn are arranged in the row direction.

The data driver 200 generates a data signal by using an image signal and is connected to the cathode electrodes C1, C2 .... Cn arranged in the column direction to transmit the data signal to the cathode electrodes C1, C2 .... Cn). The time for which the voltage of the cathode electrodes C1, C2 .... Cn selected by the data signal is maintained is adjusted.

The scan driver 300 generates a scan signal and is connected to the gate electrodes G1, G2 .... Gn, and is connected to the gate electrodes G1, G2 .... Gn of one of the plurality of gate electrodes arranged in the row direction. ) Is sequentially selected so that a predetermined voltage is transmitted to the gate electrodes G1, G2 .... Gn so that electrons are emitted from the electron emission unit in response to the difference between the data signal and the scan signal.

The timing controller 400 controls the data driver 200 and the scan driver 300 to generate data signals and scan signals from the data driver 200 and the scan driver 300 to transmit the data signals to the pixel unit 100. .

The luminance compensator 500 compensates for the variation in luminance generated by the variation in the amount of electrons emitted from the electron emission unit. The luminance compensator 500 compensates for the luminance unevenness by a compensation coefficient corresponding to 1: 1 for each pixel in response to the luminance unevenness. The luminance non-uniformity is compensated by multiplying the compensation coefficient by the video signal, and the maximum value of the compensation coefficient is larger than 1 or smaller than 1. When the maximum value of the compensation coefficient is larger than 1, there is an advantage that the luminance difference between each gray scale becomes large. When the maximum value of the compensation coefficient is smaller than 1, the size of the compensation coefficient is reduced, thereby reducing the size of the memory storing the compensation coefficient.

3 is a conceptual diagram illustrating a first embodiment in which luminance is compensated for in the electron emission display device illustrated in FIG. 2. Referring to FIG. 3, the maximum value of the compensation coefficient is greater than one.

(a) shows the luminance of the video signal input to the actual pixel, and it is assumed that a video signal having 256 gray levels is input to each of the 2x2 pixels.

(b) shows luminance represented by the characteristics of the pixel when the video signal shown in (a) is input to each of the 2x2 pixels, and each pixel is 256, 252, when the video signal shown in (a) is input. Assume that the grayscale values of 250 and 248 are represented.

(c) shows a difference from the luminance actually expressed when an image signal indicating 256 gray levels is input for each pixel, and a difference in gray level values of 0, -4, -6, and -8 occurs, respectively.

(d) denotes a compensation coefficient that is multiplied by each of 2x2 pixels, and the compensation coefficient prevents luminance unevenness because the luminance of the pixel which is the reference is the same as the luminance of other pixels. When a video signal having 256 gray values is input to each pixel as described in (c), the compensation coefficient adjusts the luminance of other pixels based on one pixel. Here, the luminance of the pixel as a reference will be described assuming that the pixel representing the gray level of 248 is a reference pixel when an image signal having a gray level value of 256 is input.

In order to emit light equal to the luminance having the gradation of 248, a pixel having a difference of 0 and the luminance of 248 must be inputted with an image signal having the gradation of 248, and a pixel having a difference of -4 between the image signal and the luminance is 248. An image signal larger than 4 gray levels, that is, a video signal expressing 252 gray levels, must be input, and a pixel with a difference of -6 between the video signal and the brightness is 6 or greater than 248 gray levels, that is, an image signal expressing 254 gray levels. Must be entered. A pixel having a difference of -8 between the image signal and the luminance needs to receive an image signal of about 256 gray levels, which is about 8 larger than 248 gray levels. At this time, in order to make the maximum value of the compensation coefficient larger than 1, the value is divided into smaller values than the maximum gray scale represented by the video signal. Here it is divided by 128. Therefore, the compensation coefficient of each pixel may be represented as 248/128, 252/128, 254/128, and 256/128.

(e) shows a compensated video signal by multiplying a compensation coefficient by a video signal representing a luminance of 256 gray levels. Each of the corrected video signals represents 2x248, 2x252, 2x254 and 2x256.

And, (f) indicates the luminance actually expressed by the compensated image signal. When the image signal compensated by the compensation coefficient is input, the difference between the image signal compensated for each pixel and the luminance actually emitted by the characteristics of each pixel is input. Occurs. The difference generated at this time corresponds to the difference of the value corresponding to twice the value shown in (c), and subtracts the value corresponding to twice the luminance difference shown in (c) from the luminance shown in (e). Each pixel represents 496 gradations. Therefore, all the pixels exhibit the same luminance, and the nonuniformity of the luminance is compensated for.

In the case of the compensation described above, the luminance of the image signal actually input and the luminance of the compensated image signal appear differently, but all pixels are proportionally compensated for luminance, so that the same luminance is represented, and thus there is no problem in representing an image. In addition, the video signal represented in maximum 256 steps is expressed in 496 steps, thereby enabling more detailed expression.

4 is a conceptual diagram illustrating a second embodiment in which luminance is compensated for in the electron emission display device illustrated in FIG. 2. Referring to FIG. 4, the maximum value of the compensation coefficient is smaller than one.

(a) shows the luminance of the video signal input to the actual pixel, and it is assumed that a video signal having 256 gray levels is input to each of the 2x2 pixels.

(b) shows luminance represented by the characteristics of the pixel when the video signal shown in (a) is input to each of the 2x2 pixels, and each pixel is 256, 252, when the video signal shown in (a) is input. Assume that the grayscale values of 250 and 248 are represented.

(c) shows a difference from the luminance actually expressed when an image signal indicating 256 gray levels is input for each pixel, and a difference in gray level values of 0, -4, -6, and -8 occurs, respectively.

(d) denotes a compensation coefficient that is multiplied by each of 2x2 pixels, and the compensation coefficient prevents luminance unevenness because the luminance of the pixel which is the reference is the same as the luminance of other pixels. When a video signal having 256 gray values is input to each pixel as described in (c), the compensation coefficient adjusts the luminance of other pixels based on one pixel. Here, the luminance of the pixel as a reference will be described assuming that the pixel representing the gray level of 248 is a reference pixel when an image signal having a gray level value of 256 is input.

In order to emit light equal to the luminance having the gradation of 248, a pixel having a difference of 0 and the luminance of 248 must be inputted with an image signal having the gradation of 248, and a pixel having a difference of -4 between the image signal and the luminance is 248. An image signal larger than 4 gray levels, that is, a video signal expressing 252 gray levels, must be input, and a pixel with a difference of -6 between the video signal and the brightness is 6 or greater than 248 gray levels, that is, an image signal expressing 254 gray levels. Must be entered. A pixel having a difference of -8 between the image signal and the luminance needs to receive an image signal of about 256 gray levels, which is about 8 larger than 248 gray levels. At this time, in order to make the maximum value of the compensation coefficient larger than 1, the value is divided into a value smaller than the maximum gray scale represented by the video signal. Here it is divided by 128. Therefore, the compensation coefficient of each pixel may be represented as 248/128, 252/128, 254/128, and 256/128.

(e) shows the compensated video signal by multiplying the compensation coefficient by the video signal representing the luminance of 256 gray levels. Each of the corrected video signals is 1/2 × 248, 1/2 × 252, 1/2 × 254 and 1 / 2x256 is shown.

And, (f) indicates the luminance actually expressed by the compensated image signal. When the image signal compensated by the compensation coefficient is input, the difference between the image signal compensated for each pixel and the luminance actually emitted by the characteristics of each pixel is input. Occurs. The difference generated at this time corresponds to the difference of the value corresponding to 1/2 times the value shown in (c), and corresponds to the half difference of the luminance difference shown in (c) from the luminance shown in (e). Subtracting the value to express each pixel represents the luminance of 124 gradations. Therefore, all the pixels exhibit the same luminance, and the nonuniformity of the luminance is compensated for.

In the case of the compensation as described above, the luminance of the image signal actually input and the luminance of the compensated image signal are different, but all pixels are proportionally compensated for luminance, so that the same luminance is represented, so there is no problem in representing an image. . In addition, since the image signal represented in the maximum 256 steps is expressed in 124 steps, detailed expression is not possible, but the size of the memory for storing the correction coefficient may be reduced by reducing the size of the correction coefficient.

FIG. 5 is a diagram illustrating an embodiment of a luminance compensator used in the electron emission display of FIG. 3. Referring to FIG. 5, the luminance compensator 500 includes a luminance detector 510, a compensation coefficient extractor 520, a memory 530, and a compensator 540.

The luminance detector 510 receives an image signal corresponding to the luminance required by the plurality of pixels 101 and detects the luminance actually expressed by the plurality of pixels 101. In this case, the luminance detector 510 may select at least two pixels 101 of the plurality of pixels 101 to detect luminance of the selected pixels 101.

The compensation coefficient extracting unit 520 sets the luminance of at least one pixel 101 among the luminance of the pixels 101 selected by the luminance detecting unit 510, and references the luminance of one pixel 101 as a reference. As a result, a compensation coefficient for correcting an image signal of each pixel 101 of the pixel unit 100 is generated.

The memory 530 stores the compensation coefficient extracted by the compensation coefficient extractor 520. The number of compensation coefficients is equal to the number of pixels to store the number of compensation coefficients as many as the number of pixels. Then, the transfer to the compensation unit 540.

The compensator 540 receives the compensation coefficient stored from the memory 530 and receives the video signal from the timing controller to correct the video signal. The compensation unit 530 multiplies the video signal by a compensation coefficient to compensate for the video signal.

6 is a flowchart illustrating an operation according to an embodiment of the present invention. Referring to FIG. 6, the electron emission display device according to the exemplary embodiment of the present invention operates in the first step ST 100 to the third step ST 120.

In the first step ST 100, at least two pixels of the plurality of pixels are selected to detect luminance of the selected pixels. In this case, when the same predetermined video signal is input to each pixel and the predetermined video signal is input, the luminance of each pixel detected in correspondence with the predetermined video signal is detected.

In the second step ST 110, a compensation coefficient for correcting an image signal of each pixel of the pixel unit 100 is set based on the luminance of at least one of the selected pixels. In this case, as shown in FIG. 3, the compensation coefficient may have a value larger than 1, or as shown in FIG. 4, so that the compensation coefficient may have a value smaller than 1.

The third step ST 120 is a step of correcting an image signal using a compensation coefficient. At this time, the video signal is corrected by multiplying the compensation coefficient by the video signal.

FIG. 7 is a perspective view illustrating a pixel unit employed in the electron emission display device illustrated in FIG. 2, and FIG. 8 is a cross-sectional view illustrating a cross section of the pixel unit illustrated in FIG. 7. Referring to FIGS. 7 and 8, the electron emission display device includes a lower substrate 110, an upper substrate 190, and a spacer 180, and insulates the cathode electrode 120 on the lower substrate 110. The layer 130, the electron emission unit 140, and the gate electrode 150 are formed, and the upper substrate 190 has a front substrate, an anode electrode, and a fluorescent film.

At least one cathode electrode 120 is formed on the lower substrate 110 in a stripe shape, and a plurality of first grooves 131 are formed on the cathode electrode 120 to expose a portion of the cathode electrode 120. The insulating layer 130 is formed. The gate electrode 150 is formed on the insulating layer 130. A plurality of second grooves 151 having a predetermined size are formed in the gate electrode 150, and the second grooves 151 are formed on the first grooves 131. The electron emission unit 140 is positioned in an area where the first groove 131 and the second groove 151 coincide with each other on the cathode electrode 120.

The lower substrate 110 uses a glass or silicon substrate, and the electron emitting unit 140 is preferably a transparent substrate such as a glass substrate when forming the same by back exposure using a paste.

The cathode electrode 120 supplies each data signal or scan signal applied from the data driver (not shown) or the scan driver (not shown) to the electron emission unit 140. Indium tin oxide (ITO) is used for the cathode electrode 120.

The insulating layer 130 is formed on the lower substrate 110 and the cathode electrode 120 to electrically insulate the cathode electrode 120 and the gate electrode 150.

The gate electrode 150 is disposed on the insulating layer 130 in a predetermined shape, for example, in a direction crossing the cathode electrode 120 on a stripe, and is applied from the data driver 200 or the scan driver 300. Is supplied to each pixel. The gate electrode 150 is made of at least one conductive metal material selected from a metal having good conductivity, such as gold (Au), silver (Ag), platinum (Pt), aluminum (Al), chromium (Cr), and alloys thereof. .

The electron emission units 140 are electrically connected to the cathode electrodes 120 exposed by the first openings 131 of the insulating layer 130, respectively, and are disposed of materials that emit electrons when an electric field is applied. Carbon based materials or nanometer (nm) size materials, carbon nanotubes, graphite, graphite nanofibers, diamond-like carbon, C ₆₀ , silicon nanowires and combinations thereof are preferred.

The upper substrate 190 includes a fluorescent film to emit light when electrons collide with the fluorescent film, and an anode electrode so that the electrons emitted from the electron emitting part may collide with the upper substrate.

The spacer 180 maintains a constant distance between the lower substrate 110 and the upper substrate 190.

While preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. You must lose.

According to the electron emission display device and the control method thereof according to the present invention, the light emission unevenness between pixels of the electron emission device can be compensated to a more accurate value.

Claims (10)

A pixel unit including a plurality of pixels which emit light by applying a predetermined voltage to the first electrode and the second electrode by the data signal and the scan signal; A data driver which receives an image signal and generates the data signal and transmits the data signal to the pixel unit; A scan driver which generates the scan signal and transmits the scan signal to the pixel unit; A timing controller which controls operations of the data driver and the scan driver; And A luminance compensator configured to correct the image signal transmitted to each of the plurality of pixels by using a compensation coefficient corresponding to each of the plurality of pixels, And the luminance compensator performs a multiplication operation on the video signal to compensate for the video signal, and the maximum value of the compensation coefficient is greater than one. The method of claim 1, The compensation coefficient is a sum of the luminance corresponding to the difference between the luminance actually expressed in each pixel corresponding to an image signal having a predetermined gray level and even the input image signal to the gray level of the reference luminance and the predetermined image signal. An electron-emitting display device which is a value obtained by dividing by a number smaller than the gradation of. According to claim 1, wherein the luminance compensation unit A luminance detector which detects luminance of each pixel of the pixel portion; A compensation coefficient extracting unit extracting the compensation coefficient using the luminance of each pixel detected by the luminance detecting unit; A memory for storing the compensation coefficient extracted by the compensation coefficient extraction unit; And And a compensation unit for compensating the image signal by using a compensation coefficient stored in the memory. A pixel unit including a plurality of pixels which emit light by applying a predetermined voltage to the first electrode and the second electrode by the data signal and the scan signal; A data driver which receives an image signal and generates the data signal and transmits the data signal to the pixel unit; A scan driver which generates the scan signal and transmits the scan signal to the pixel unit; A timing controller which controls operations of the data driver and the scan driver; And A luminance compensator configured to correct the image signal transmitted to each of the plurality of pixels by using a compensation coefficient corresponding to each of the plurality of pixels, And the luminance compensator performs a multiplication operation on each of the compensation coefficients to the video signal to compensate for the video signal, wherein the maximum value of the compensation coefficient is less than one. The method of claim 4, wherein The compensation coefficient is a sum of the luminance corresponding to the difference between the luminance actually expressed in each pixel corresponding to an image signal having a predetermined gray level and even the input image signal to the gray level of the reference luminance and the predetermined image signal. An electron-emitting display device which is a value obtained by dividing by a number greater than the gradation of. The method of claim 4, wherein the luminance compensation unit A luminance detector which detects luminance of each pixel of the pixel portion; A compensation coefficient extracting unit extracting the compensation coefficient using the luminance of each pixel detected by the luminance detecting unit; A memory for storing the compensation coefficient extracted by the compensation coefficient extraction unit; And And a compensation unit for compensating the image signal by using a compensation coefficient stored in the memory. A method of driving an electron emission display device for generating a data signal using a video signal to display an image corresponding to the data signal, Generating the data signal according to a predetermined video signal emitting light at a first luminance and measuring the luminance of each pixel based on the data signal; Calculating a compensation coefficient for correcting the image signal based on the measured luminance, wherein the maximum value of the compensation coefficient is greater than 1; And And compensating for the luminance by multiplying the compensation coefficient by an arbitrary image signal. The method of claim 7, wherein The calculating of the compensation coefficient may include selecting a reference luminance as a reference and identifying the luminance of the compensation pixel for calculating the compensation coefficient; And And dividing the reference luminance by a value smaller than the image signal to a value smaller than the luminance of the compensation pixel by the difference between the luminance of the compensation pixel and the luminance of the reference pixel. A method of driving an electron emission display device for generating a data signal using a video signal to display an image corresponding to the data signal, Generating a sound data signal from a predetermined video signal emitting light at a first brightness level and measuring brightness of each pixel based on the data signal; Calculating a compensation coefficient for correcting the image signal based on the measured luminance, wherein calculating a maximum value of the compensation coefficient to have a value smaller than 1; And And compensating for the luminance by multiplying the compensation coefficient by an arbitrary image signal. The method of claim 9, The calculating of the compensation coefficient may include selecting a reference pixel as a reference and identifying the luminance of the reference pixel and the luminance of the compensation pixel for calculating the compensation coefficient; And And dividing a value larger than the image signal by a value smaller than the luminance of the compensation pixel by the difference between the luminance of the compensation pixel and the luminance of the reference pixel.

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