KR20150078299A - Display device and driving method thereof - Google Patents

Abstract

The present invention relates to a display device and a driving method thereof. The display device performs data compensation control for compensating holes and a back light control together, and performs a proper compensation control for holes having various shapes caused by various reasons, thereby preventing degradation of image quality by the holes.

Description

DISPLAY DEVICE AND DRIVING METHOD THEREOF [0002]

The present invention relates to a display device and a driving method thereof.

2. Description of the Related Art [0002] As an information-oriented society develops, there has been a growing demand for display devices for displaying images. Recently, a liquid crystal display (LCD), a plasma display panel (PDP) Various display devices such as an organic light emitting display (OLED) device are used.

These display devices may be exposed to various display defects (mura, mura) during the test process. The term mura refers to a display unevenness accompanied by a luminance difference on a display screen, and representative examples are mura due to panel defects and mura due to backlight.

Display spots due to panel defects are generated in the manufacturing process of the liquid crystal panel and may have a regular shape such as a dot, a line, a band, a circle, and a polygon depending on the cause of the occurrence, and may have an irregular shape.

The backlight caused by the backlight is generated by the structure of the backlight unit, and the light from the light source disposed under the display panel leaks toward the display area side of the display panel.

Fig. 1 is a diagram showing an example of a mura shape in a general display device, and an example of a mura shape by a backlight.

As shown in Fig. 1 (a), the upper end portion and the lower end portion of the screen are respectively shown in a transversely striped shape, or they are vertically striped at the left end portion and the right end portion as shown in Fig. 1 (b) Alternatively, as shown in Fig. 1 (c), it may appear in the shape of a circle or a polygon on the periphery of the upper end center portion, lower end central portion, each corner portion, etc. of the peripheral portion of the display region.

The image displayed at the position of the mura-generated region is darker or lighter than the surrounding non-mura region, and the color difference is different from that of the non-mura region.

Therefore, the display defects caused by moisture can lead to defects of the product depending on the degree of defects, and defective products lower the yield, which leads to an increase in cost. In addition, when the product in which the product is found is shipped as a good product in the test stage, the product quality is deteriorated due to the degradation of image quality due to unevenness.

In view of the foregoing, it is an object of the present invention to provide a display device and a method of driving the same, which can prevent deterioration of image quality due to unevenness by performing appropriate compensation control on various shapes of mirrors according to various causes in one aspect will be.

In another aspect, an object of the present invention is to provide a display device and a method of driving the same that can perform compensation control for a light generated as light from a backlight leaks from a backlight in a low gray level to a display area.

In order to achieve the above object, in one aspect, the present invention provides a display panel comprising: a display panel in which a plurality of pixels are defined by intersecting data lines and gate lines; A scan driver for supplying a scan signal to the gate lines; A data driver for supplying a data voltage to the data lines; And a timing controller for performing data compensation control and backlight control for image data for compensating for unevenness in the presence of unevenness on the basis of mura distribution data.

According to another aspect of the present invention, there is provided a data compensation control method comprising the steps of: performing a data compensation control for performing data compensation control for image data to compensate for a mura pixel in which mura is generated based on mura distribution data; And a backlight control step of performing backlight control on the image data according to the performance of the data compensation control.

As described above, according to the present invention, it is possible to prevent image quality deterioration due to mura by performing appropriate compensation control on mura of various shapes according to various causes, regardless of gradation, It is possible to improve the quality of the output image.

In addition, according to the present invention, it is possible to perform more accurate compensation control by performing data compensation control and backlight control together to compensate for unevenness, and it is possible to reduce power consumption of a product.

Fig. 1 is a diagram showing an example of a shape of a mura appearing in a general display device, and shows a shape of a mura by a backlight.
2 is a system configuration diagram of a display device to which an embodiment is applied.
3 is a diagram showing a stepwise graph of the compensation control of the display according to the embodiment.
Figs. 4 and 5 are specific embodiments in which the mura compensation control is performed in the display device according to the embodiment. Fig.
6 is an exemplary diagram showing an example of spread data in the display device according to the embodiment.
7 is a graph showing the shape of the convex function for each gradation in the display device according to the embodiment.
8 is a graph showing the backlight control in the display device according to the embodiment.
9 is a diagram showing the duty ratio of a drive signal applied to the backlight unit according to the compensation control of the display in the display device according to the embodiment.
10 is a flowchart showing a driving method of a display apparatus according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected." In the same context, when an element is described as being formed on an "upper" or "lower" side of another element, the element may be formed either directly or indirectly through another element As will be understood by those skilled in the art.

2 is a system configuration diagram of a display device to which an embodiment is applied.

2, the display device 100 may include a timing controller 110, a data driver 120, a gate driver 130, and a display panel 140

Further, the backlight unit 150 and the backlight driver 160 may be included.

The timing controller 110 controls the data driver 120 based on vertical and horizontal synchronizing signals Vsync and Hsync input from the host system and external timing signals such as image data RGB and a clock signal CLK And a gate control signal (GCS) for controlling the gate driver 130. The gate control signal GCS for controlling the gate driver 130 is supplied to the gate driver 130, The timing controller 110 converts the video data RGB input from the host system 150 into a data signal format used by the data driver 120 and outputs the converted video data R'G'B ' To the data driver 120. For example, the timing controller 110 can supply the data driver 120 with the converted image data (R'G'B ') in accordance with the resolution or pixel structure of the display panel 140.

The data driver 120 receives the data control signal DCS input from the timing controller 110 and the converted video signal R'G'B 'in response to the converted video signal R'G'B' (Data signal or analog pixel signal) which is a voltage value corresponding to the gray level value, and supplies the converted data voltage to the data line.

The gate driver 130 sequentially supplies a scan signal (a gate pulse, a scan pulse, and a gate-on signal) to the gate line in response to a gate control signal GCS input from the timing controller 110.

The display panel 140 defines a plurality of pixels at the intersections of the plurality of gate lines G1 to Gn and the plurality of data lines D1 to Dm. At least one organic electroluminescent device including a cathode, which is a first electrode, a cathode, a cathode, and a light emitting layer is connected to each pixel, or a liquid crystal between two substrates is switched by using a transistor And may include a liquid crystal cell for emitting light. In other words, the display panel 140 may be an organic light emitting display panel or a liquid crystal display panel, but the present invention is not limited thereto and any display panel may be used.

A backlight unit (BLU) 150 provides light to the display panel.

The backlight unit 150 includes a plurality of light sources, and the light source may include at least one of a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), an external electro fluorescent lamp (EEFL) Lt; / RTI > The backlight unit 150 may include an optical member including a light guide plate, a diffusion plate, a prism sheet, a lens sheet, a protective sheet, or the like for efficient light emission and provision.

The light source may be disposed in a non-display area of the display panel, and may emit light to the entire surface of the display panel through the light guide plate, and may be disposed on the back surface of the display panel to emit light directly to the entire display area.

The backlight driving unit 160 controls a backlight driving signal applied to the light source in accordance with a control signal from the timing controller 110. [ The backlight driving unit 160 controls the duty ratio of the PWM signals dim1 to dimk under the control of the timing controller 110 to control the amount of light emitted from the light source Can be adjusted.

The timing controller 110 according to the embodiment can perform the data compensation control and the backlight control for the image data in order to compensate for the presence of uneven pixels generated on the basis of the mura distribution data, The duty ratio of the backlight driving signal output from the backlight driving unit varies depending on the backlight control in the timing controller 110. [

Further, the timing controller can determine and apply the data compensation amount according to the brightness of the non-pixel in each gradation on the basis of the data compensation amount for compensating for unevenness when the gradation value in all pixels is zero and the gain set for each gradation .

The backlight driving signal may include a global dimming signal and / or a local dimming signal, wherein the global dimming method may improve the dynamic contrast ratio measured between the previous frame and the next frame, The local dimming method can improve the static contrast ratio which is difficult to improve with global dimming by locally controlling the luminance of the image data signal within one frame period.

The timing controller 110 of the display device 100 according to the embodiment can perform data compensation control and backlight control on the image data of the pixels based on the spread data.

Fig. 3 is a diagram showing an example in which, in the display device according to the embodiment, a step-by-step graph of the mura compensation control is generated on the road, left, right,

The timing controller 110 according to the embodiment calculates a convex function for the compensation control based on the distribution data as shown in FIG. 3 (a).

The timing controller 110 calculates the compensation value for the pixels as shown in FIG. 3 (b) based on the calculated convex function, applies the calculated compensation value to the image data for each pixel, Control is performed.

The timing controller 110 may calculate the compensation value for each pixel so that the luminance in all the pixels becomes uniform within a certain range based on the calculated convex function.

At this time, the convex function and the corresponding compensation value for each pixel may be stored in advance in a memory (not shown). A more detailed description of the convex function will be described later with reference to FIG.

When the luminance between the pixels becomes uniform through the data compensation control as shown in FIG. 3 (c), the timing controller 110 performs backlight control so that the uniformly high luminance is lowered by the backlight reference luminance. At this time, the backlight reference brightness means a brightness intended to be outputted through the display panel 140, which represents the brightness of pixels that have not undergone the data compensation before performing the data compensation control.

In the embodiment, the timing controller 110 can set the average brightness of the pixels that have not generated no mura based on the mura distribution data as the backlight reference brightness, and the brightness of the backlight reference brightness is also set to a different value according to the gray level .

Referring to FIG. 3, the timing controller 110 according to the embodiment of the present invention will be described in more detail with reference to FIG. 3, in which the image data of the pixels of the display panel 140 +) Compensation so that the luminance of all the pixels as a whole has a luminance as high as the luminance of the pixel and the luminance of all the pixels is controlled so as to be uniform so that the luminance is not recognized.

The timing controller 110 adjusts the backlight gain to a low level through the backlight control so that the brightness of pixels that are uniformly uniformed at a high luminance is lowered to a backlight reference luminance, thereby displaying the luminance at an intended luminance.

A detailed description will be given of a mura compensation control of the timing controller according to the above-described embodiment with specific examples.

Figs. 4 and 5 are specific embodiments in which the mura compensation control is performed in the display device according to the embodiment. Fig.

For convenience of explanation, as shown in FIG. 4, a light amount per unit area (1) applied to one pixel (p), an image data value (d) applied to the pixel, and a brightness (b) And the luminance (b) of each pixel is calculated by summing the light quantity (l) per unit area of the pixel and the image data value (d).

In the case of pixels having a size of 4X4 as shown in FIG. 4, four pixels located at (0,0), (0,1), (0,2), and (0,3) , (3,0), (3,1), (3,2), and (3,3) are identified as mura pixels determined to be mura, and the remaining pixels are identified as mura It can be identified as a non-mura pixel determined not to be a non-mura pixel.

When the amount of light emitted from the light source is 1 for such 4 × 4 pixels and 1 image data is applied, the luminance of the eight pixels identified as non-pixel pixels can be 2.

However, four pixels located at (0,0), (0,1), (0,2), and (0,3) identified as uneven pixels and four pixels located at (3,0) The control signals are outputted so that the amount of light is 1 in the backlight driver 160 in the four pixels located at (3, 2) and (3, 3), but light is leaked due to the backlight structure, The light amount per unit area in the corresponding pixel may be 1.5 larger than 1 and accordingly it may appear to have a luminance of 2.5.

(0, 0), (3, 0) and (3, 0) among the 4 × 4 pixels, 0) is 2.5, the timing controller 110 compensates the image data so that the luminance of the pixels located at (1,0) and (2,0) is 2.5, .

That is, the image data of the (1,0) pixel is 1, but 0.5 can be further compensated to be 1.5 so that the luminance is 2.5, and the compensation of (2,0) Can be 1.5.

However, since the intended luminance (target luminance) to be outputted from the pixels of (0,0), (1,0), (2,0), and (3,0) is 2, The amount of light is reduced by adjusting the backlight gain so that a luminance of 2 can be output.

That is, as shown in FIG. 5, since the image data has a value of 1 in the case of the (0, 0) pixel, the light amount per unit area must be 1 in order to obtain the luminance of 2. However, as shown in FIG. 4, since the amount of light per unit area of the (0,0) pixel is 1.5, the timing controller 110 applies backlight gain of 2/3 to control the output of the backlight driving signal (0, 0) pixel is set to be 1 per unit area.

In the case of the (1,0) pixel, since the compensation value of 0.5 is added to the image data to have a value of 1.5, the light quantity per unit area should be 0.5 in order to obtain the luminance of 2. However, as shown in FIG. 4, since the amount of light per unit area of the (1,0) pixel is 1, the timing controller 110 applies a backlight gain of 1/2 to control the backlight driving signal to be outputted ) Pixel is set to 0.5.

(2, 0) pixels, the image data is 1.5. Therefore, in order for the luminance to be 2, the amount of light per unit area should be 0.5, and accordingly, the timing controller 110 applies a backlight gain of 1/2, So that the light amount per unit area in the (2,0) pixel is reduced from 1 to 0.5.

(3, 0) pixels, the image data is 1. Therefore, in order for the luminance to be 2, the light amount per unit area must be 1. Accordingly, the timing controller 110 applies a backlight gain of 2/3, So that the amount of light per unit area in the (3, 0) pixel is reduced from 1.5 to 1.

Accordingly, the pixels of (0,0), (1,0), (2,0), and (3,0) all have a uniform luminance value of 2, and (0,0), ) Also have the same luminance, so that it is impossible to recognize the occurrence of blur in the naked eye, and the blurred image can be output as a natural image.

In particular, the backlight gain is reduced according to the degree of compensation applied to the image data of the pixels where no image is formed, thereby reducing the power consumption for lighting the backlight unit.

6 is an exemplary diagram showing an example of spread data in the display device according to the embodiment.

The mura distribution data includes position information of mura appearing in the display area of the display panel in a state in which the same amount of light and the same image data are applied to all the pixels.

In the embodiment, the uneven distribution data can be generated based on the image data obtained by imaging the display area at 0 gray so that the gradation of all the pixels becomes 0 in order to include the information about the unevenness displayed in the surroundings.

As shown in FIG. 6, if the display region is imaged after making the gamma of 8x6 pixels, the bright regions M1 and M2 may appear longer in the vertical direction on the left and right ends, respectively , These areas can be identified as mura.

The position information on the display panel corresponding to the resolution of the image data and the number of pixels of the display panel can be derived from the positions of the regions M1 and M2 identified as not in the image data.

In addition, the luminance information measured for the display area in the 0 gray can be received from the means for measuring the luminance of the contact type luminance meter or the like. The actual luminance in the areas (M1, M2) The luminance information measured and the luminance information obtained by measuring the actual luminance in the normal pixel region identified as having no mura to be generated can be reflected in the mura distribution data.

Therefore, as shown in FIG. 6, the mura distribution data may include both the magnitude of the mura and the luminance value at that time in the form of a map representing the pixels.

At this time, since the distribution data is generated on the basis of the screen displayed on the actual display panel, the display area of the display panel is divided into the areas M1 and M2 and the area other than the area Mura by the backlight unit structure Can be identified.

Such spread data may be generated by external compensation means and stored in the memory of the timing controller 110 or may be generated by the timing controller 110. [

In addition, since the luminance difference between gradations can be perceived more clearly in the high gradation than in the low gradation, the difference in the luminance difference between the gradation and the non-gradation can be different .

Therefore, the mura distribution data according to the embodiment can be generated for each predetermined gradation, for example, 0gray, 8gray, 16gray, or the like, or stored in the memory.

On the other hand, as shown in FIG. 6, the luminance measured according to the position may be varied even if the same area is included.

In the embodiment, the image data of each pixel is compensated so that the luminance of all the pixels becomes equal to the luminance of the pixel in a certain range, as described above. Therefore, according to how to set the luminance of the pixel, The amount of compensation in the compensation control becomes different.

Therefore, the timing controller according to the embodiment can derive the convex function based on the mura distribution data, and calculate the luminance change with respect to the pixels.

7 is a graph showing the shape of the convex function for each gradation in the display device according to the embodiment.

Referring to FIG. 7 and FIG. 3 described above, when a luminance change occurs in the horizontal direction, the vertical direction, or the diagonal direction depending on the position, the timing controller 110 calculates The convex function can be derived so that the luminance gradually decreases from the point to the farthest point to the other point in the same direction.

Therefore, the brightness change in the horizontal direction with respect to the display panel in which the vertically elongated muffle is generated at the left end portion and the right end portion, as shown in Fig. 3 (a) The value of the convection function corresponding to the left end may be the highest value of the brightness of the mura displayed at the left end or the average value of the mura brightness or may be arbitrarily selected It can be any one value.

Similarly, the value in the convection function corresponding to the right end may be the highest value of the brightness of the mura or the average value of the mura brightness shown at the right end, or any arbitrarily selected value.

Since the luminance according to the position of the mirror has a relatively continuous value in the convection function, the amount of compensation can be changed according to which point the luminance compensation is to be performed. In addition, Control can be performed. In other words, (+) compensation can be performed on the image data even in the region that is visually recognized as belonging to the mura.

This convection function can be derived based on the mura distribution data in 0gray. Since the luminance change may appear differently for each gradation as in the mura distribution data, the convection gain is applied based on the convection function in 0gray, Function can be derived respectively.

At this time, as shown in FIG. 7, the convection function according to the gradation can be derived as a shape in which the curvature increases as the difference between the maximum value and the minimum value decreases from the low gradation to the high gradation.

At this time, as shown in FIG. 7, the convection function according to the gradation can be derived as a shape in which the curvature increases as the difference between the maximum value and the minimum value decreases from the low gradation to the high gradation.

In other words, in the embodiment, when the brightness that is displayed brighter than the surrounding is generated, the luminance distribution in the display panel is implemented as a convection function, and as data compensation control based on the implemented convection function, So that the luminance of the light source is uniform.

Such a convection function can be derived for each gradation, and data compensation can be performed based on a convection function derived not only at a low gradation but also at a high gradation, thereby achieving more accurate data compensation even at a high gradation.

8 is a graph showing the backlight control in the display device according to the embodiment.

As shown in Fig. 8, in the case of the mura appearing at higher luminance than the peripheral region, when the backlight gain for outputting to the target luminance in each gray level and the backlight gain for outputting to the bodily sensation brightness of the mura pixels in each gray level are compared, Since the luminance is higher than the target luminance, the backlight gain value for outputting the same luminance as the bodily sensation luminance of the pixel at the same gradation level is higher than the backlight gain value for outputting to the target luminance.

As described above, since the timing controller performs (+) compensation for the pixels that have not generated no image through the data compensation control, and compensates the image data to have a luminance as high as the luminance of the uneven pixels, The backlight gain must be lowered in order to obtain the luminance in the case where the image data before luminance compensation is applied.

9 is a diagram showing the duty ratio of a drive signal applied to the backlight unit according to the compensation control of the display in the display device according to the embodiment.

Namely, as shown in Fig. 9 (a), when the non-mura region A can be divided into the mura region A and the non-mura region B, as shown in Fig. 9 (b) The duty ratio of the backlight driving signal for adjusting the light amount may have a value larger than the duty ratio of the backlight driving signal for adjusting the light amount with respect to the non-

4 and 5 together, four pixels located at (0, 0), (0,1), (0,2), and (0,3) 3, 1), (3, 2) and (3, 3) corresponds to the mura region, and the remaining 8 pixels correspond to the non-mura region. (0,0) and (3,0) pixels belonging to the mura region and the backlight gains of the (1,0) and (2,0) pixels belonging to the non-mura region are compared, The backlight gain applied to (3,0) pixels is 2/3, whereas the backlight gain applied to (1,0) and (2,0) pixels is 1/2, respectively.

When the reference duty ratio of the backlight driving signal is 1, the duty ratio of the backlight driving signal applied to the light source corresponding to the unevenness area A becomes 1 * 2/3 to 2/3, and corresponds to the non- The duty ratio of the backlight driving signal applied to the light source is 1/2 * 1/2, so that the light source corresponding to the mura region A is turned on more than the time when the light source corresponding to the non- The time is longer and the time when the light source is lit is less than the time that is turned on by the backlight driving signal having the reference duty ratio, so that the power consumption of the display device is reduced.

The above-described embodiment can be applied more effectively at low gradations where the gradation is lower than or equal to the reference gradation. Conventionally, when a gradation that appears brighter than the surrounding at a low gradation occurs, there is a limitation in applying (-) compensation to the image data, There are cases where the compensation control for the mura can not be performed.

However, in the embodiment, when a light source, such as a light source, occurs, (+) compensation is performed on image data of other pixels where no image has been generated, and backlight control is performed so that the backlight gain is lowered according to the degree of compensation, Compensation control can be performed.

On the other hand, mura means that a luminance difference is generated so as to be visually perceived with neighboring pixels even though the same image data is applied. Since the human eye has a luminance difference large enough to be recognized by the naked eye as the gradation becomes higher, Can be less than the level of compensation for the low gray level at the high gray level, which is higher than the reference gray level.

That is, even if a small amount of light is recognized at a low gradation level, a difference in luminance between pixels is clearly recognized. However, if a small amount of light is added at a high gradation level, the compensation of data is performed through data compensation control and backlight control And even if performed, a small amount of compensation control can be performed.

In addition, since the gradation can be sufficiently expressed even if (-) compensation is applied to the image data as the brightness increases in the relay or high gradation, the data compensation control can sufficiently perform the compensation control with only the data compensation control.

In this case, the timing controller 110 performs data compensation control for applying a negative (-) compensation value to image data for uneven pixels so that the luminance of the uneven pixels is equal to the luminance of the pixel The compensation can be performed more accurately by applying the compensation value differently to the pixels having different luminance based on the convex function indicating the luminance distribution in the corresponding gray level.

In addition, although the above description has been made in detail to perform the compensation control for the mura which is displayed brighter than the surroundings, it is not limited to the kind of mura. Therefore, when a mura that is darker than the surrounding area is identified on the basis of the mura distribution data, the timing controller 110 compensates the image data of the mura pixels to perform data compensation control, or performs backlight driving The duty ratio of the signal is controlled so that the luminance of the pixel is equal to the luminance of the pixel not determined to have been generated within a certain range, and thus the luminance is not recognized.

10 is a flowchart showing a driving method of a display apparatus according to an embodiment.

Referring to FIG. 10, a method of driving a display device according to an embodiment of the present invention includes the steps of: performing data compensation control on image data to compensate for unevenness in a case where uneven pixels are generated based on mura distribution data; And a backlight control step of performing backlight control on the image data according to the performance of the data compensation control.

In the non-uniform distribution data generation step, the display region of the display panel may generate the non-uniform distribution data based on the sensed image data (S110)

That is, the image data is applied so that the gray level value in all the pixels of the display panel becomes 0 so as to clearly identify the mura region and the non-mura region. Based on the image data obtained by imaging the display area at this time, positional information of the unevenness area or positional information of the nonuniform area is obtained, and uneven distribution data for the display panel is generated based on the obtained positional information.

At this time, the mura distribution data may include the luminance value measured for the display area in which the gray level value of all the pixels is 0, and the luminance value of the non-mura pixels and the luminance difference between the mura pixels and non- May be reflected in determining the amount of compensation in performing data compensation control.

For example, uneven distribution data in 32 gray is generated by applying image data so that the grayscale value in all the pixels of the display panel is 32, and the image obtained by imaging the display area at this time Can be generated based on the positional information of the mura region obtained based on the data.

The data compensation control performing step and the backlight controlling performing step may operate differently according to the gradation. In the case of low gradation, for example, from 0gray to 16gray, in the data compensation control performing step, The image data compensation value of the pixels is determined so that the luminance of the non-mura pixels becomes uniform within a certain range with respect to the luminance of the mura pixels based on the convex function in the image data of the corresponding pixels. (S130)

Next, in the backlight control performing step, the backlight gain is calculated according to the compensation value applied to the image data, and a control signal is generated so that the calculated backlight gain is applied to the backlight driving unit, May be output from the backlight driver and applied to the light source (S150)

However, for example, in the case of the relay group and the high gradation at 16 gray or more, it is possible to derive the convex function at each gradation level based on the previously derived convex function in the 0 gray and the predetermined convex gain in the gradation step. Further, based on the mura distribution data in each gradation step and the convex function in the corresponding gradation step, the (-) compensation value for the pixels is determined so that the luminance of the non-mura pixels becomes uniform within a certain range with the luminance of the non-mura pixels And applies the determined compensation value to the image data of the pixels corresponding thereto.

(-) compensation is performed on the image data of the pixels in the relay group and the high gray level, the overall luminance uniformity can be maintained, and the backlight control may not be performed because the luminance is compensated by the luminance to be expressed.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: timing controller 150: backlight unit
160: Backlight driver

Claims (10)

A display panel in which a plurality of pixels are defined by intersecting data lines and gate lines;
A scan driver for supplying a scan signal to the gate lines;
A data driver for supplying a data voltage to the data lines; And
A timing controller (not shown) for performing data compensation control and backlight control for image data for compensating for unevenness in the presence of unevenness pixels generated based on mura distribution data,
. The method according to claim 1,
The timing controller includes:
Based on the mura distribution data, data compensation control of the image data for the pixel in which the mura has not been generated so that the luminance of the pixel determined not to be generated by the mura is equal to the luminance of the mura pixel To the display device. The method according to claim 1,
The timing controller includes:
Wherein the backlight control unit performs the backlight control so that the light amount of the backlight is reduced as the compensation value according to the data compensation control is increased. The method according to claim 1,
The timing controller includes:
And performs the data compensation control for backlight compensation and the backlight control when the gradation of the image data is equal to or lower than the reference gradation. The method according to claim 1,
The timing controller includes:
And the luminance of the pixel is determined to be equal to the luminance of the pixel determined to have not occurred by the luminance of the pixel if the luminance of the pixel is equal to or less than a predetermined range based on the non- And performs data compensation control. The method according to claim 1,
Wherein the mura distribution data includes positional information about a mura generation area when a gray level value of all the pixels of the display panel is zero. The method according to claim 1,
The timing controller includes:
And determines a data compensation amount in accordance with the brightness of the sub pixel in each gradation based on the data compensation amount for compensating for the unevenness when the gradation value in all the pixels is 0 and the compensation gain in each gradation. The method according to claim 1,
The timing controller includes:
The data compensation control is performed using the luminance of the region in which the data compensation control and the backlight control have not been performed as the reference luminance as the reference luminance, And the backlight control is performed by adjusting the backlight gain so that the backlight is controlled to be the same. A data compensation control step of performing data compensation control on image data for compensating for mura if there are mura pixels on which mura is generated based on mura distribution data; And
Performing backlight control on the image data according to the data compensation control;
And a driving method of the display device. 10. The method of claim 9,
Wherein the non-uniform distribution data is generated on the basis of the image data on which the display panel is picked up when the tone value of all the pixels is 0 and the measured luminance information.

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