KR20190033313A - Display device and driving method of the same - Google Patents

Abstract

The present invention relates to a display device and a driving method thereof and, more specifically, to a display device periodically moving an image displayed on a display panel and a driving method thereof. The display device comprises: a display panel outputting an image; and a timing control unit periodically moving the image within a certain range. The timing control unit includes an image cycle analysis unit analyzing a cycle of the image outputted to the display panel and an image movement cycle determination unit determining an image movement cycle in which the timing control unit moves the image based on the cycle of the image. Thus, the display device of the present invention may prevent that the deterioration concentrated on a part of the display panel, thereby effectively reducing afterimages of the display panel.

Description

DISPLAY DEVICE AND DRIVING METHOD OF THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device and a driving method thereof, and more particularly, to a display device for periodically moving an image displayed on a display panel and a driving method thereof.

BACKGROUND ART Demands for a display device for displaying an image have been increasing in various forms as an information society has developed. Recently, a liquid crystal display device, a plasma display panel, an organic light emitting display device Organic Light Emitting Display Device) are being utilized.

Such a display device includes data lines and gate lines, and includes a display panel having pixels arranged at a point where data lines and gate lines cross each other. The display device includes a data driver for supplying a data voltage to the data lines, a gate driver for supplying a gate voltage to the gate lines, and a timing controller for controlling the data driver and the gate driver.

Recently, a display panel for outputting a commercial advertisement image and a driving method thereof have been studied. Here, since the commercial advertisement image is periodically repeated, the display panel repeatedly outputs a constant gradation. Therefore, a part of the display panel which outputs a high gray level is degraded as compared with the other parts of the display panel, resulting in an image sticky.

Accordingly, those skilled in the art have attempted to improve the afterimage of a part of the display panel by moving the commercial advertisement image itself displayed on the display panel within a range that the viewer can not recognize.

However, when the period of the commercial advertisement image is equal to the period of movement of the commercial advertisement image, a part of the display panel which repeatedly outputs high gradation exists. Therefore, deterioration of a part of the display panel still occurs, and the effect of the afterimage improvement due to the above-mentioned commercial advertisement image is remarkably deteriorated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a display device and a method of driving the same that can improve the afterimage phenomenon by adjusting a moving period and a moving position of an image displayed on a display panel.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a display apparatus including a display panel for outputting an image and a timing controller for periodically moving an image within a predetermined range, And an image movement period determiner for determining an image movement period, which is a period during which the timing controller moves the image, based on the period of the image.

According to an aspect of the present invention, there is provided a method of driving a display device, including the steps of: analyzing a period of an image output to a display panel; And an image movement period determining step of determining an image movement period as a period.

The details of other embodiments are included in the detailed description and drawings.

The display device and the driving method thereof according to the present invention can prevent the deterioration of a part of the display panel from being concentrated by adjusting the degraded part of the display panel to be slightly different, have.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a schematic block diagram for explaining a display device according to an embodiment of the present invention.
2 is a circuit diagram for explaining driving of a pixel arranged in a display device according to an embodiment of the present invention.
3 is a schematic block diagram illustrating a timing controller included in a display apparatus according to an exemplary embodiment of the present invention.
4 is a view for explaining the operation of the image period analyzing unit of the display apparatus according to an embodiment of the present invention.
5 is a view for explaining the operation of the image moving unit of the display device according to the embodiment of the present invention.
6 is a graph for explaining an afterimage-improving effect of a display device according to an embodiment of the present invention and another embodiment.
7 is a flowchart illustrating a method of driving a display device according to an embodiment of the present invention.
8 is a flowchart for explaining a video period analysis step of a method of driving a display device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured by the present invention. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

 The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram for explaining a display device according to an embodiment of the present invention.

Referring to FIG. 1, a display device 100 includes a display panel 110, a data driver 120, a gate driver 130, and a timing controller 140.

The display panel 110 includes a plurality of gate lines GL1 to GLm and a plurality of data lines DL1 to DLn formed in a matrix form on a substrate made of glass or plastic. A plurality of pixels Px are defined at intersections of the plurality of gate lines GL1 to GLm and the data lines DL1 to DLn.

Each pixel Px of the display panel 110 is provided with at least one thin film transistor.

The display device 100 may be an organic light emitting display. In this case, current is applied to the organic light emitting diode arranged in the plurality of pixels Px, and excitons are generated by the combination of the emitted electrons and the holes. Then, the excitons emit light to realize the gray scale of the OLED display. Details of this will be described later with reference to Fig.

As described above, the display device 100 is not limited to the organic light emitting display device, and may be various display devices such as a liquid crystal display device.

Each pixel Px may include a plurality of sub-pixels, and each sub-pixel may emit light of a specific color. For example, the plurality of sub-pixels may be composed of a red sub-pixel that emits red, a green sub-pixel that emits green, and a blue sub-pixel that emits blue, but the present invention is not limited thereto.

The timing controller 140 supplies various control signals DCS and GCS and image data RGB to the data driver 120 and the gate driver 130 to control the data driver 120 and the gate driver 130 .

The timing control unit 140 starts the scanning in accordance with the timing to be implemented in each frame, based on the timing signal TS received from the external host system. The timing controller 140 converts the video signal VS received from the external host system into a data signal format that can be processed by the data driver 120 and outputs the video data RGB. Thus, the timing controller 140 controls the data driving at a proper time according to the scan.

 The timing controller 140 generates various signals including a vertical synchronizing signal Vsync, a vertical synchronizing signal Hsync, a data enable signal DE, a data clock signal DCLK, And receives the timing signals TS from the external host system.

The timing controller 140 controls the data driver 120 and the gate driver 130 by using a vertical synchronization signal Vsync, a vertical synchronization signal Hsync, a data enable signal DE, a data clock signal DCLK, And outputs various control signals DCS and GCS to the data driver 120 and the gate driver 130,

For example, in order to control the gate driver 130, the timing controller 140 may include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GCS) including a gate enable signal (GCS), enable signal (GOE), and the like.

Here, the gate start pulse controls the operation start timing of one or more gate circuits constituting the gate driver 130. The gate shift clock is a clock signal commonly input to one or more gate circuits, and controls the shift timing of the scan signal (gate pulse). The gate output enable signal specifies timing information of one or more gate circuits.

In addition, the timing controller 140 may include a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (Souce Output Enable) to control the data driver 120. SOE), and the like.

Here, the source start pulse controls the data sampling start timing of one or more data circuits constituting the data driver 120. The source sampling clock is a clock signal that controls the sampling timing of data in each data circuit. The source output enable signal controls the output timing of the data driver 120.

The timing controller 140 controls the timing controller 140 to control the connection of the source printed circuit board to which the data driver 120 is connected through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC) And may be disposed on a printed circuit board (Control Printed Circuit Board).

The control PCB may further include a power controller for controlling various voltages or currents to supply or supply various voltages or currents to the display panel 110, the data driver 120, the gate driver 130, and the like. The power control unit may be referred to as a power management IC (PMIC).

The source printed circuit board and the control printed circuit board described above may be constituted by one printed circuit board.

The gate driver 130 sequentially supplies the gate voltages of the on voltage or the off voltage to the gate lines GL1 to GLm under the control of the timing controller 140. [

The gate driver 130 may be located on only one side of the display panel 110, or may be located on both sides of the display panel 110, depending on the driving method.

The gate driver 130 may be connected to a bonding pad of the display panel 110 by a Tape Automated Bonding (TAB) method or a chip on glass (COG) In Panel type, and may be directly disposed on the display panel 110, and may be integrated and disposed on the display panel 110, as the case may be.

The gate driver 130 may include a shift register, a level shifter, and the like.

The data driver 120 converts the image data RGB received from the timing controller 140 into analog data voltages and outputs them to the data lines DL1 to DLn.

The data driver 120 may be connected to the bonding pad of the display panel 110 by a tape automation bonding method or a chip on glass method or may be directly disposed on the display panel 110, As shown in FIG.

In addition, the data driver 120 may be implemented by a chip on film (COF) method. In this case, one end of the data driver 120 may be bonded to at least one source printed circuit board, and the other end may be bonded to the display panel 110.

The data driver 120 may include a logic unit including various circuits such as a level shifter and a latch unit, a digital analog converter (DAC), an output buffer, and the like.

2 is a circuit diagram for explaining driving of a pixel arranged in a display device provided in a display device according to an embodiment of the present invention.

The driving of each pixel Px will be described with reference to FIG. First, the switching transistor ST is turned on by the gate voltage supplied to the gate lines GL1 to GLm of each pixel Px. The data voltage Vdata is supplied from the data lines DL1 to DLn by the turned-on switching transistor ST and the driving current I _OLED is supplied by the driving transistor DT. Is controlled. Finally, the organic light emitting diode OLED emits light corresponding to the controlled driving current I _OLED , thereby displaying an image.

3 is a schematic block diagram illustrating a timing controller included in a display apparatus according to an exemplary embodiment of the present invention.

3, the timing control unit 140 includes a video period analyzing unit 141, an video moving period determining unit 143, and an video moving unit 145, Periodically within a certain range.

The image period analyzing unit 141 analyzes the period of the image output to the display panel 110.

The image period analyzing unit 141 may analyze the period of the image output to the display panel 110 as follows.

First, the image period analyzing unit 141 recognizes the image period manually input by the user, and can grasp the period of the image.

Second, the image period analyzing unit 141 recognizes the repetition period of the reference pattern ST included in the image, and can grasp the period of the image.

4 is a view for explaining the operation of the image period analyzing unit of the display apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the image of the first period Pv1 may be composed of k frames, and the image of the second period Pv2 may also be composed of k frames. That is, the display panel 110 periodically outputs an image composed of k frames.

Here, the reference pattern ST can be displayed in the first frame (1 frame) of the images of the respective periods Pv1 and Pv2. The image period analyzing unit 141 recognizes the reference pattern ST displayed in the first frame 1Frame among the images of the respective periods Pv1 and Pv2 and can analyze the repetition period of the reference pattern ST, The repetition period of the pattern ST can be determined as the period Pv of the image.

Thirdly, if the period Pv of the image is not inputted or the reference pattern ST can not be grasped, the image period analyzing unit 141 can analyze the frame information to grasp the period Pv of the image .

In other words, the image period analyzing unit 141 recognizes the gradation difference between the reference frame of the image and the frame at the time point after the reference frame, and grasps the period (Pv) of the image.

Specifically, the first frame is set as the reference frame, and the difference between the gradations implemented in each pixel of the first frame and the gradation implemented in each pixel of the second and subsequent frames is compared. If the difference in gradation is larger than the threshold gradation, And if the difference in gradation is smaller than or equal to the threshold gradation, it is determined that the image has been repeated by one cycle.

In this manner, the image period analyzing unit 141 determines the period from the reference frame to the current frame as the image period (Pv) when the difference in gradation is smaller than or equal to the threshold gradation. Details thereof will be described later with reference to Fig.

The image movement period determiner 143 determines a period Pm for moving the image based on the image period Pv.

Specifically, when the period Pv of the image determined by the image period analyzing unit 141 is close to infinity or is very long and the image output to the display panel 110 is determined to be a still image, the image movement period determining unit 143 sets the preset reference period to the image movement period Pm.

Next, when it is determined that the image period Pv determined by the image period analyzing unit 141 is converged to a predetermined value and the image output to the display panel 110 is repeated at a predetermined image period Pv, The movement period determining unit 143 determines the image movement period Pm as a value between the first period Ps1 and the second period Ps2, as shown in Table 1. Here, the first period Ps1 may be from 30 minutes to 60 minutes, and the second period Ps2 may be from 150 minutes to 210 minutes longer than the first period Ps1.

[Table 1]

During the period (Pv) of the image value of the first period is shorter than the (Ps1) (Pv <Ps1) , n 1 times (n ₁ is a natural number) of the image movement cycle (Pm) imaging period (Pv), the first Is determined as a value between one period (Ps1) and the second period (Ps2).

The image movement period Pm is determined to be equal to the image period Pv when the period Pv of the image is between the first period Ps1 and the second period Ps2 (Ps1 <Pv <Ps2) . That is, the image movement period Pm is determined as a value between the first period Ps1 and the second period Ps2.

If the period Pv of the image is longer than the second period Ps2 (Ps2 <Pv), the image movement period Pm is set to 1 / n2 times (n2 is a natural number) Is determined as a value between a first period (Ps1) and a second period (Ps2) longer than the first period (Ps1).

In this way, the image movement period determiner 143 can synchronize the image movement period Pm and the image period Pv.

The image moving unit 145 further moves the image within at least one pixel range after the image is moved according to the image movement period Pm.

5 is a view for explaining the operation of the image moving unit of the display device according to the embodiment of the present invention.

Referring to FIG. 5, with respect to image movement according to the first image movement period Pm1, two frames (two frames) to n frames (n frames ), The image moves according to a certain orbit to improve the afterimage.

Next, regarding the image movement according to the second image movement period Pm2, the reference position is moved from (0,0) to (1,0) in one frame (1 Frame) During the n frames (n frames), the image moves according to the same orbit to improve afterimage.

Accordingly, the image movement according to the first image movement period Pm1 and the image movement according to the second image movement period Pm2 differ by one pixel range.

For convenience of explanation, the above description has been made on the assumption that the reference position is moved within one pixel range. However, the present invention is not limited to this, and it is also possible that the reference position moves in various directions within a plurality of pixel ranges.

In this way, even if the image period Pv and the image movement period Pm become equal by moving the image after the image is moved according to the image movement period Pm, So that it is possible to prevent the display panel 110 from being concentrated in one portion. Therefore, even when the period Pv of the image and the image movement period Pm are equal to each other, the afterimage of the display panel 110 can be effectively improved.

Hereinafter, a display device according to another embodiment of the present invention will be described. Since the embodiment of the present invention differs from the embodiment of the present invention only in the technical characteristics of the image movement period determination unit and the image movement unit, the description of the other redundant components will be omitted.

The image movement period determination unit 243 of the display device according to another embodiment of the present invention determines the image movement period Pm to be different from the image period Pv.

Specifically, the image movement period determiner 243 can determine the image movement period Pm so that the image is moved within at least one pixel range when the image is moved according to the image movement period Pm.

That is, the image movement period determiner 243 extends or reduces the image movement period Pm determined by the value between the first period Ps1 and the second period Ps2 as described above, So that it can be moved within at least one range when moved according to the period Pm.

For example, when the image movement period Pm determined as a value between the first period Ps1 and the second period Ps2 is 120 minutes and the image is set to move 120 pixels during 120 minutes, which is the image movement period Pm, The image movement period determiner 243 may set the image movement period Pm to be either 121 minutes or 119 minutes so as to be different from 120 minutes to 1 pixel moving time.

Thus, the image movement period determiner 243 determines the image movement period Pm, so that the image movement according to the previous image movement period Pm and the image movement according to the next image movement period Pm are performed in the range of one pixel There is a difference.

Or the image movement period determining unit 243 may arbitrarily change the image movement period Pm to be different from the image period (Pv).

As a result, the deteriorated part of the display panel 110 is slightly different from the display panel 110, so that the deterioration of the display panel 110 can be prevented. Thus, the afterimage of the display panel 110 can be effectively improved.

6 is a graph for explaining an afterimage-improving effect of a display device according to an embodiment of the present invention and another embodiment.

6, in the case of the comparative example in which the image movement period Pm and the image period Pv are the same, there is a residual image improvement effect of 0.5%, and the image movement period Pm is set to be different from the image period Pv In the case of the second embodiment in which random variation is performed, there is an afterimage improvement effect of 16.1%, and the image movement according to the previous image movement period Pm and the image movement according to the next image movement period Pm are different by one pixel range In the case of the first embodiment in which the image movement period Pm is set so that there is a residual image improvement effect of 22.0%.

5, setting the image movement period Pm such that the image movement according to the previous image movement period Pm and the image movement according to the next image movement period Pm differ by one pixel range, It can be seen that it is most effective for improvement.

Hereinafter, a method of driving a display device according to an embodiment of the present invention will be described with reference to FIG.

7 is a flowchart illustrating a method of driving a display device according to an embodiment of the present invention.

7, a method of driving a display device (S100) according to an exemplary embodiment of the present invention includes an image period analysis step (S110), an image movement period determination step (S120), and an image movement step (S130) do.

In the image period analyzing step S110, the period of the image outputted to the display panel 110 is analyzed.

In the image period analysis step S110, the period of the image output to the display panel 110 may be analyzed as follows.

First, in the image period analyzing step (S110), the image period of the image can be recognized by recognizing the image period directly input by the user.

Second, in the image period analyzing step S110, the repetition period of the reference pattern ST included in the image is recognized, and the period of the image can be grasped.

As shown in FIG. 4, the image of the first period Pv1 may be composed of k frames, and the image of the second period Pv2 may also be composed of k frames. That is, the display panel 110 periodically outputs an image composed of k frames.

Here, the reference pattern ST can be displayed in the first frame (1 frame) of the images of the respective periods Pv1 and Pv2. Thus, it is possible to analyze the repetition period of the reference pattern ST by recognizing the reference pattern ST displayed in the first frame 1Frame among the images of the respective periods Pv1 and Pv2, (Pv) of the image.

Thirdly, in the image period analyzing step S110, when the period Pv of the image is not inputted or the reference pattern ST can not be grasped, the period Pv of the image can be grasped by analyzing each frame information .

In other words, in the image period analyzing step (S110), the difference in gradation between the reference frame of the image and the frame after the reference frame is recognized, and the period (Pv) of the image is grasped.

8 is a flowchart for explaining a video period analysis step of a method of driving a display device according to an embodiment of the present invention.

8, in the image period analysis step (S110), the first frame is set as a reference frame, and the difference between the gradation implemented in each pixel of the first frame and the gradation implemented in each pixel of the second and subsequent current frames (? G) with the threshold gradation (Gth) (S111)

It is judged that the image is still being output and the flag signal Flag is changed from 0 to 1 which is the basic setting value and the first time (Gth) T1) and the time from the reference frame to the current frame (Time). (S113)

When the time from the reference frame to the current frame is longer than the first time T1, it is determined that the period Pv of the image output to the display panel 110 is very long. (Case 1)

When the time (Time) from the reference frame to the current frame is shorter than or equal to the first time (T1), the difference between the gradation implemented in each pixel of the first frame, which is the reference frame, ) Is compared with the threshold gradation (Gth).

It is determined that the image has been repeated by one cycle and the second time T2 and the time from the reference frame to the current frame Time. (S115)

Here, the second time T2 is set to a relatively short value as compared with the first time T1.

If the time (Time) from the reference frame to the current frame is longer than the second time (T2), the value of the flag signal (Flag) is determined. (S117)

If the flag signal (Flag) is 1, it means that the difference (? G) between the gradations of the reference frame and the previous frame has been greater than the threshold gradation (Gth). This means that the periodically repeated image is being output, The time (Time) from the reference frame to the current frame can be determined as the period (Pv) of the image. (Case 2)

If the flag signal Flag is 0, it means that the difference? G between the gradation levels of the reference frame and the previous frame is always smaller than the threshold gradation Gth. This means that a still image is being output to the display panel 110 it means. (Case 3)

When the time (Time) from the reference frame to the current frame is shorter than or equal to the second time (T2), the difference between the grayscale realized in each pixel of the first frame, which is the reference frame, ) Is compared with the set gradation range (Gth).

In this way, in the video period analysis step S110, when the gradation difference? G is smaller than the threshold voltage Gth, the time period from the reference frame to the current frame is determined as the video period Pv.

In the image movement period determination step S120, a period Pm for moving the image is determined based on the image period Pv.

Specifically, when the period Pv of the image determined in the image period analysis step S110 is close to infinity or is very long and the image output to the display panel 110 is determined as a still image (Case 1, 3) In the image movement period determination step S120, the preset reference period is set as the image movement period Pm.

Next, when it is determined that the image period Pv determined in the image period analysis step S110 converges to a predetermined value and the image output to the display panel 110 is repeated at a predetermined image period Pv, In the image movement period determination step S120, as shown in Table 1, the image movement period Pm is determined as a value between the first period Ps1 and the second period Ps2. Here, the first period Ps1 may be from 30 minutes to 60 minutes, and the second period Ps2 may be from 150 minutes to 210 minutes longer than the first period Ps1.

[Table 1]

During the period (Pv) of the image value of the first period is shorter than the (Ps1) (Pv <Ps1) , n 1 times (n ₁ is a natural number) of the image movement cycle (Pm) imaging period (Pv), the first Is determined as a value between one period (Ps1) and the second period (Ps2).

The image movement period Pm is determined to be equal to the image period Pv when the period Pv of the image is between the first period Ps1 and the second period Ps2 (Ps1 <Pv <Ps2) . That is, the image movement period Pm is determined as a value between the first period Ps1 and the second period Ps2.

If the period Pv of the image is longer than the second period Ps2 (Ps2 <Pv), the image movement period Pm is set to 1 / n2 times (n2 is a natural number) Is determined as a value between a first period (Ps1) and a second period (Ps2) longer than the first period (Ps1).

In the image movement period determination step S120, the image movement period Pm and the image period Pv can be synchronized.

In the image moving step S130, the image is moved according to the image moving period Pm, and then the image is further moved within at least one pixel range.

Referring to FIG. 5, with respect to image movement according to the first image movement period Pm1, two frames (two frames) to n frames (n frames ), The image moves according to a certain orbit to improve the afterimage.

Next, regarding the image movement according to the second image movement period Pm2, the reference position is moved from (0,0) to (1,0) in one frame (1 Frame) During the n frames (n frames), the image moves according to the same orbit to improve afterimage.

Accordingly, the image movement according to the first image movement period Pm1 and the image movement according to the second image movement period Pm2 differ by one pixel range.

For convenience of explanation, the above description has been made on the assumption that the reference position is moved within one pixel range. However, the present invention is not limited to this, and it is also possible that the reference position moves in various directions within a plurality of pixel ranges.

In this way, even if the image period Pv and the image movement period Pm become equal by moving the image after the image is moved according to the image movement period Pm, So that it is possible to prevent the display panel 110 from being concentrated in one portion. Therefore, even when the period Pv of the image and the image movement period Pm are equal to each other, the afterimage of the display panel 110 can be effectively improved.

Hereinafter, a driving method of a display apparatus according to another embodiment of the present invention will be described. Since the other embodiments of the present invention and the embodiment of the present invention differ only in the technical characteristics of the image movement period determination step and the image movement step, the description of the remaining overlapping components will be omitted.

In the image movement period determination step S220 of the display device driving method according to another embodiment of the present invention, the image movement period Pm is determined to be different from the image period Pv.

Specifically, in the image movement period determination step S220, when the image is moved according to the image movement period Pm, the image movement period Pm can be determined to be moved within at least one pixel range.

That is, in the image movement period determination step S220, the image movement period Pm determined as a value between the first period Ps1 and the second period Ps2 is extended or reduced as described above, To be moved within at least one range when it is moved according to the distance Pm.

For example, when the image movement period Pm determined as a value between the first period Ps1 and the second period Ps2 is 120 minutes and the image is set to move 120 pixels during 120 minutes, which is the image movement period Pm, In the image movement period determination step S220, the image movement period Pm may be set to be either 120 minutes or 119 minutes so as to be shifted by one pixel moving time.

Thus, by determining the image movement period Pm in the image movement period determination step S220, the image movement according to the previous image movement period Pm and the image movement according to the next image movement period Pm can be performed in a range of one pixel There is a difference.

Alternatively, in the image movement period determination step S220, the image movement period Pm may be arbitrarily changed to be different from the image period Pv.

As a result, the deteriorated part of the display panel 110 is slightly different from the display panel 110, so that the deterioration of the display panel 110 can be prevented. Thus, the afterimage of the display panel 110 can be effectively improved.

According to an aspect of the present invention, there is provided a display apparatus including a display panel for outputting an image and a timing controller for periodically moving an image within a predetermined range, And an image movement period determiner for determining an image movement period, which is a period during which the timing controller moves the image, based on the period of the image.

According to another aspect of the present invention, the image period analyzing unit recognizes the repetition period of the reference pattern included in the image and analyzes the period of the image.

According to another aspect of the present invention, the image period analyzing unit recognizes a gradation difference between a reference frame of the image and a frame after the reference frame, and analyzes the period of the image.

According to another aspect of the present invention, the image movement period determination unit determines the image movement period to be different from the period of the image.

According to another aspect of the present invention, the image movement period determination unit determines the image movement period so that the image is moved within at least one pixel range when the image is moved according to the image movement period.

According to another aspect of the present invention, the image movement period determination unit determines the image movement period so that the image is moved within at least one pixel range when the image is moved according to the image movement period.

According to another aspect of the present invention, there is further provided an image moving unit for moving the image further within at least one pixel range after the image is moved according to the image movement period.

According to still another aspect of the present invention, the image movement period determination unit determines the image movement period as the period of the image when the period of the image is between a first period and a second period longer than the first period.

According to another aspect of the present invention, when the period of the image is shorter than the first period, the image movement period determination unit determines the image movement period as n ₁ times (n ₁ is a natural number) Is determined as a value between a first period and a second period longer than the first period.

According to still another aspect of the present invention, when the period of the image is longer than the second period, the image movement period is set to 1 / n ₂ times (n ₂ is a natural number) And a second period longer than the first period.

According to an aspect of the present invention, there is provided a method of driving a display device, including the steps of: analyzing a period of an image output to a display panel; And an image movement period determining step of determining an image movement period as a period.

According to another aspect of the present invention, in the image period analysis step, the repetition period of the reference pattern included in the image is recognized, and the period of the image is analyzed.

According to another aspect of the present invention, in the image period analyzing step, the gradation difference between the reference frame of the image and the frame after the reference frame is recognized, and the period of the image is analyzed.

According to still another aspect of the present invention, in the image movement period determination step, the image movement period is determined to be different from the period of the image.

According to still another aspect of the present invention, in the image movement period determination step, the image movement period is determined so that the image is moved within at least one pixel range when the image is moved according to the image movement period.

According to another aspect of the present invention, there is further provided an image moving step of moving the image further within at least one pixel range after the image is moved according to the image moving period.

According to another aspect of the present invention, in the image movement period determination step, when the period of the image is between a first period and a second period longer than the first period, the image movement period is determined as a period of the image .

According to still another aspect of the present invention, there is provided a method for determining a moving image, the method comprising: when a period of the image is shorter than a first period in the image moving period determination step, the image moving period is set to n ₁ times (n ₁ is a natural number) And determines a value between the first period and a second period longer than the first period.

According to another aspect of the present invention, in the image movement period determination step, when the period of the image is longer than the second period, the image movement period is 1 / n ₂ times (n ₂ is a natural number) Of the values of the first period and the second period longer than the first period.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope 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. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. 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.

100: display device
110: Display panel
120: Data driver
130: Gate driver
140:
141:
143: image moving period determination unit
145:

Claims (18)

A display panel for outputting an image, and
And a timing controller for periodically moving the image within a predetermined range,
Wherein the timing control unit comprises:
An image period analyzing unit for analyzing a period of an image output to the display panel;
And an image movement period determiner for determining an image movement period, which is a period during which the timing controller moves the image, based on the period of the image. The method according to claim 1,
Wherein the image period analyzing unit comprises:
And recognizes a repetition period of the reference pattern included in the image, and analyzes the period of the image. The method according to claim 1,
Wherein the image period analyzing unit comprises:
And recognizes a gradation difference between a reference frame of the image and a frame after the reference frame, and analyzes the period of the image. The method according to claim 1,
The image movement period determination unit may determine,
And determines the image movement period so as to be different from the period of the image. 5. The method of claim 4,
The image movement period determination unit may determine,
And determines the image movement period so that the image is moved within at least one pixel range when the image is moved according to the image movement period. The method according to claim 1,
Further comprising an image movement unit for moving the image further within at least one pixel range after the image is moved according to the image movement period. The method according to claim 6,
The image movement period determination unit may determine,
When the period of the image is between a first period and a second period longer than the first period,
And determines the image movement period as a period of the image. The method according to claim 6,
The image movement period determination unit may determine,
If the period of the image is shorter than the first period,
And determines the image movement period to be a value between the first period and a second period longer than the first period, out of values of n ₁ times (n ₁ is a natural number) of the image period. The method according to claim 6,
The image movement period determination unit may determine,
If the period of the image is longer than the second period,
And determines the image movement period to be a value between the first period and a second period longer than the first period among values of 1 / n ₂ times (n ₂ is a natural number) of the period of the image. A driving method of a display apparatus including a display panel for outputting an image,
An image period analyzing step of analyzing a period of an image outputted to the display panel;
And determining an image movement period, which is a period for moving the image, based on the period of the image. 11. The method of claim 10,
In the image period analysis step,
And recognizing a repetition period of the reference pattern included in the image, and analyzing the period of the image. 11. The method of claim 10,
In the image period analysis step,
And recognizing a gradation difference between a reference frame of the image and a frame after the reference frame, and analyzing the period of the image. 11. The method of claim 10,
In the image movement period determination step,
And determines the image movement period to be different from the period of the image. 14. The method of claim 13,
In the image movement period determination step,
Wherein the determining step determines the image movement period so that the image is moved within at least one pixel range when the image is moved according to the image movement period. 11. The method of claim 10,
Further comprising an image shifting step of shifting the image in at least one pixel range after the image is shifted according to the image shifting period. 16. The method of claim 15,
In the image movement period determination step,
When the period of the image is between a first period and a second period longer than the first period,
And determines the image movement period as a period of the image. 16. The method of claim 15,
In the image movement period determination step,
If the period of the image is shorter than the first period,
Wherein the image movement period is determined to be a value between the first period and a second period longer than the first period, among values of n ₁ times (n ₁ is a natural number) of the period of the image. The method according to claim 6,
In the image movement period determination step,
If the period of the image is longer than the second period,
Wherein the image movement period is determined as a value between the first period and a second period longer than the first period among values of 1 / n ₂ times (n ₂ is a natural number) Way.

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