WO2020189828A1

WO2020189828A1 - Display device and control method therefor

Info

Publication number: WO2020189828A1
Application number: PCT/KR2019/003288
Authority: WO
Inventors: 이재용; 김상열; 함동호
Original assignee: 엘지전자 주식회사
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2020-09-24

Abstract

The present invention relates to a display device and a control method therefor, wherein the control method controls the display device to sense luminance of a specific region corresponding to a burn-in region and luminance of a background region excluding the specific region from among the entire region, and correcting the luminance of the background region on the basis of a difference between the luminance of the background region and the luminance of the specific region.

Description

Display device and control method thereof

The present invention relates to a display device and a method for controlling the same, and relates to a display device and a control method for removing an afterimage by sensing a deteriorated region of a display panel in which an afterimage occurs, and correcting luminance of a region excluding the deteriorated region.

Flat panel displays (FPDs) are used in various types of electronic products, including mobile phones, tablet PCs, and notebook computers. Flat panel display devices include a liquid crystal display (LCD), a plasma display panel (PDP), an organic light-emitting display (OLED), and the like, and recently, an electrophoretic display device ( EPD: ELECTROPHORETIC DISPLAY) is also widely used. Of these, organic light-emitting display devices (OLEDs) have the advantage of high response speed and high luminous efficiency, luminance, and viewing angle by using self-luminous devices that emit light by themselves.

In the organic light emitting display device, since an image is displayed by driving an organic light emitting device (OLED) that is a self-luminous device, deterioration of the organic light emitting device (OLED) proceeds due to various causes. That is, due to the self-luminous nature of the organic light-emitting device (OLED), deterioration occurs due to the logo when an image including a high-luminance object, such as a logo, is continuously applied.

In the case of the prior art, due to such deterioration, a difference in brightness and color sense is recognized in the organic light emitting display device and an afterimage remains, which makes it inconvenient for users to view the screen.

An embodiment of the present invention provides a display device and a control method for removing an afterimage by sensing a deteriorated region of a display panel in which an afterimage occurs, and correcting the luminance of a non-degraded region excluding the deteriorated region to a luminance level of the deteriorated region. It aims to do that.

In another embodiment of the present invention, a gain value for correcting the luminance of the deteriorated region to the luminance of the non-degraded region is stored in a memory in a lookup-table format, and the luminance of the non-degraded region is determined by referring to the lookup table. It is an object of the present invention to provide a display device and a method of controlling the same for correcting by reverse compensation.

In another embodiment of the present invention, when an afterimage occurs on the screen, the display panel controls to display a message indicating that the afterimage has occurred, and when an input for selecting an afterimage correction execution icon is received from the user, an afterimage correction application An object of the present invention is to provide a display device and a control method for removing an afterimage by executing

The technical problem to be achieved in the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. .

According to an embodiment of the present invention, a display device includes: a display panel including a plurality of pixels; A sensor unit sensing the degree of deterioration of the plurality of pixels and the luminance of the plurality of pixels; And controlling the sensor unit to sense the degree of deterioration of the plurality of pixels, dividing the entire area of the display area into a deterioration area and a non-degradation area based on the sensing result, and Controls to sense the luminance and luminance of a background region other than the specific region among the entire region, corrects the luminance of the background region based on the luminance difference between the luminance of the background region and the luminance of the specific region, and corrects with the specific region And a controller configured to generate image data of the background area and control the display panel to display the generated image data.

According to another embodiment of the present invention, a method of controlling a display device includes: controlling to sense a degree of deterioration of a plurality of pixels constituting a display panel; Dividing the entire area of the display area into a deteriorated area and a non-degraded area based on the sensing result; Controlling a sensor unit to sense the luminance of a specific region corresponding to the deterioration region and a luminance of a background region excluding the specific region of the entire region; Correcting the luminance of the background region based on a difference between the luminance of the background region and the luminance of the specific region; Generating image data of a specific region and the corrected background region; And controlling the display panel to display the generated image data.

According to an embodiment of the present invention, since an afterimage can be removed by sensing a deteriorated area in the display panel where an afterimage occurs, and correcting the luminance of the non-degraded area excluding the deteriorated area to the luminance level of the deteriorated area, the lifespan of the display panel Can be improved and user convenience can be improved.

According to another embodiment of the present invention, a gain value for correcting the luminance of the deteriorated region to the luminance of the non-degraded region is stored in a memory in a lookup-table format, and the luminance of the non-degraded region is stored in a memory with reference to the lookup table. Since the luminance is corrected by inverse compensation, the lifespan of the display panel can be improved, and user convenience can be improved.

According to another embodiment of the present invention, when an afterimage occurs on the screen, the display panel is controlled to display a message indicating that the afterimage has occurred, and when an input for selecting an afterimage correction execution icon is received from the user, the afterimage correction Since the afterimage is removed by executing the application, the lifespan of the display panel can be improved, and user convenience can be improved.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those of ordinary skill in the art from the following description. will be.

1 is a diagram illustrating a configuration of a display device according to an embodiment of the present invention.

2 is a flowchart illustrating a method of controlling a display device according to an exemplary embodiment of the present invention.

3 is a diagram illustrating correcting a luminance of a background region to a luminance of a specific region according to an embodiment of the present invention.

4 is a diagram illustrating an afterimage compensation algorithm according to an embodiment of the present invention.

5 is a diagram illustrating an inverse residual image compensation algorithm according to an embodiment of the present invention.

6 is a diagram illustrating execution of an afterimage compensation algorithm according to an embodiment of the present invention.

7 is a diagram illustrating execution of an inverse residual image compensation algorithm according to an embodiment of the present invention.

8 is a diagram illustrating an afterimage life according to an embodiment of the present invention.

9 is a diagram showing a change in luminance over time and an OLED deterioration degree according to an embodiment of the present invention.

FIG. 10 is a graph showing a luminance change amount and an OLED deterioration degree over time according to an embodiment of the present invention.

11 is a diagram illustrating modeling a value compensated by a reduced luminance as a gain according to an embodiment of the present invention.

12 is a diagram illustrating a luminance curve of a background region and a luminance curve of a specific region according to an embodiment of the present invention.

13 is a diagram illustrating a luminance curve of a background region and a luminance curve of a specific region when the luminance of a specific region rapidly decreases according to an embodiment of the present invention.

14 is a diagram illustrating afterimage evaluation data according to an embodiment of the present invention.

15 is a diagram illustrating luminance specifications in the case of a daily video or a heavy video according to an embodiment of the present invention.

16 is a diagram illustrating that an afterimage occurs in a logo of a broadcaster according to an embodiment of the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves.

In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted.

In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention , It should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Referring to FIG. 1, the display device 100 includes a display panel 110, a sensor unit 120, a control unit 130, and a memory 140.

The display panel 110 includes a plurality of pixels. The display panel 110 displays image data according to a control command from the controller.

The sensor unit 120 senses the degree of deterioration of the plurality of pixels and the luminance of the plurality of pixels.

The controller 130 controls the sensor unit 120 to sense the degree of deterioration of the plurality of pixels, divides the entire area of the display area into a deterioration area and a non-deterioration area based on the sensing result, and the sensor unit 120 Control to sense the luminance of a specific region corresponding to the deterioration region and the luminance of a background region excluding the specific region among the entire region, and determine the luminance of the background region based on the luminance difference between the luminance of the background region and the specific region. It corrects, generates image data of the specific region and the corrected background region, and controls the display panel 110 to display the generated image data.

There is a sensor unit 120 inside the display device 100, and the control unit 130 compares the current sensing data sensed by the sensor unit 120 and initial sensing data to determine the brightness and the degree of deterioration.

2 is a flowchart illustrating a method of controlling a display device according to an exemplary embodiment of the present invention. This method is performed by the control unit 130.

Referring to FIG. 2, control is performed to sense the degree of deterioration of a plurality of pixels constituting the display panel (S210).

Based on the sensing result, the entire area of the display area is divided into a deteriorated area and a non-degraded area (S220).

The sensor unit 120 controls to sense the luminance of a specific region corresponding to the deterioration region and the luminance of a background region excluding the specific region of the entire region (S230).

The luminance of the background region is corrected based on the difference between the luminance of the background region and the luminance of the specific region (S240).

Image data of a specific region and the corrected background region are generated (S250).

The display panel 110 is controlled to display the generated image data (S260).

3 is a diagram illustrating correcting a luminance of a background region to a luminance of a specific region according to an embodiment of the present invention. 3 includes FIGS. 3(a) and 3(b).

Fig. 3(a) is a diagram for explaining a prior art correction method.

Referring to FIG. 3A, in the case of the prior art, the entire area 300 is divided into a specific area 320 and a background area 310. The specific region 320 refers to a region in which luminance decreases as time passes due to deterioration. The background area 310 means an area where deterioration does not proceed.

For example, when a predetermined time elapses, the specific area 320 is deteriorated so that the screen brightness becomes from 100 nits to 95 nits, and the background area 310 is maintained at 100 nits.

In the case of the prior art, the brightness of the specific area 320 is corrected to the brightness of the background area 310. So, when the brightness 320 of a specific area is 95 nits, 100 nits were corrected.

3(b) is a diagram explaining the correction method of the present invention.

Referring to FIG. 3B, in the case of the present invention, the entire area 300 is divided into a specific area 320 and a background area 310. The specific region 320 refers to a region in which luminance decreases as time passes due to deterioration. The background area 310 means an area where deterioration does not proceed.

In the present invention, the brightness of the background area 310 is corrected to the brightness of the specific area 320. So, when the brightness 310 of the background region is 100 nits, 95 nits were corrected.

That is, in the case of the present invention, it is possible to prevent the user from recognizing an afterimage by correcting the brightness of the background region to the brightness level of the specific region.

4 is a diagram illustrating an afterimage compensation algorithm according to an embodiment of the present invention. 4 includes FIGS. 4(a) and 4(b).

Fig. 4(a) is a diagram showing a gain value with respect to time.

Referring to FIG. 4(a), the x-axis means time, and the y-axis means compensation gain. The gain value may vary depending on the blue, red, green, and white devices.

For example, when the elapsed time is initial, the compensation value may be approximately 1 because deterioration has not occurred in the display panel.

If the elapsed time is 200 hours, the compensation gain can be 1.17.

If the elapsed time is 400 hours, the compensation gain can be 1.34.

If the elapsed time is 600 hours, the compensation gain can be 1.5.

The maximum value of the compensation gain is 1.5. When the compensation gain exceeds 1.5, the display panel can no longer brighten the luminance.

FIG. 4B is a diagram illustrating that a compensation gain is stored in a memory and afterimage compensation is performed using the compensation gain.

The control unit 130 stores the compensation gain value in the memory 140. Specifically, the controller 130 may store the compensation gain value in the memory 140 in the form of a lookup table.

As shown in FIG. 4B, the display panel 410 in which deterioration has progressed may be divided into a specific area 412 and a background area 414. The brightness of the specific area 412 is 80 nits, and the brightness of the background area 414 is 100 nits.

The controller 130 may compensate the brightness of the specific region 412 by referring to the compensation gain value stored in the memory 140 in the form of a lookup table. When compensating the brightness of the specific region 412, the controller 130 refers to a compensation gain value and performs compensation by executing an afterimage compensation algorithm. In this case, since the brightness of the specific area 412 is 80 nits and the brightness of the background area 414 is 100 nits, the compensation gain is 1.25.

The display panel 420 on which the afterimage compensation has been performed may be divided into a specific area 422 and a background area 424. The brightness of the specific area 422 is 100 nits, and the brightness of the background area 424 is 100 nits. Therefore, since the brightness of the specific area 422 and the background area 424 are the same, the user cannot see the afterimage.

5 is a diagram illustrating an inverse residual image compensation algorithm according to an embodiment of the present invention. Figure 5 includes Figures 5(a) and 5(b).

Fig. 5(a) is a diagram showing a gain value with respect to time.

Referring to FIG. 5(a), the x-axis represents time, and the y-axis represents compensation gain. The gain value may vary depending on the blue, red, green, and white devices.

If the elapsed time is 200 hours, the compensation gain can be 1.17.

If the elapsed time is 400 hours, the compensation gain can be 1.34.

If the elapsed time is 600 hours, the compensation gain can be 1.5.

FIG. 5(b) is a diagram showing that a compensation gain is stored in a memory and inverse compensation is performed using this.

As shown in FIG. 5B, the display panel 510, which has undergone deterioration, may be divided into a specific area 512 and a background area 514. The brightness of the specific area 512 is 95 nits, and the brightness of the background area 514 is 100 nits.

The controller 130 may compensate the brightness of the specific region 512 by referring to the compensation gain value stored in the memory 140 in the form of a lookup table. When compensating for the brightness of the specific region 512, the controller 130 refers to a compensation gain value and performs an afterimage inverse compensation algorithm to compensate. In this case, since the brightness of the specific region 512 is 95 nits and the brightness of the background region 514 is 100 nits, the compensation gain is 0.95. That is, the brightness of the background area 514 is compensated with the brightness of a specific area.

The display panel 520 on which reverse compensation has been performed may be divided into a specific area 522 and a background area 524. The brightness of the specific area 522 is 95 nits, and the brightness of the background area 524 is 95 nits. Accordingly, since the specific area 522 and the background area 524 have the same brightness, the user cannot see the afterimage.

In the case of the present invention, since the background area 524 is corrected by using a gain lookup table storing a compensation gain value used in the past, the amount of data can be reduced.

The memory 140 stores a gain value for correcting the luminance of the specific region 522 to the luminance of the background region 524 in a lookup-table format.

The controller 140 corrects the luminance of the background region 524 with the luminance of the specific region 522 by inverse compensation by referring to the lookup table of the memory 130. For example, when the luminance of the specific region 522 is 95 nits, the controller 140 corrects the luminance of the background region 524 to 95 nits. In this case, the compensation gain is 0.95.

6 is a diagram illustrating execution of an afterimage compensation algorithm according to an embodiment of the present invention. 6 includes FIGS. 6(a), 6(b), and 6(c).

Referring to Fig. 6(a), in the store mode, it automatically operates every 600 hours. For example, after 600 hours of watching TV, a message 10 indicating that panel noise removal is executed when the power is turned off is displayed, and when an input 30 for selecting the OK button 20 is received, the afterimage compensation algorithm is executed. do.

Referring to FIG. 6B, the controller 130 executes an afterimage compensation algorithm. The time required for the afterimage algorithm may be 1 hour. During the execution of the afterimage compensation algorithm, if the display device 100 is activated again, the execution of the afterimage compensation algorithm is paused. When the afterimage compensation algorithm is executed again later, the control unit 130 executes the afterimage compensation algorithm again from the moment when the image is temporarily stopped.

Referring to FIG. 6C, execution of the afterimage compensation application is completed, and a horizontal white line 50 descends in the direction of an arrow 60 from the top of the screen of the display device 100 to the bottom of the screen. When the operation of the horizontal white line 50 descending from the screen to the bottom ends, the execution of the afterimage compensation algorithm is completed. When the display device 100 is turned on again, the controller 130 controls the display panel 110 to display a completion message 70. For example, the completion message 70 is displayed at a specific location on the screen in a pop-up format, and disappears from the screen when a predetermined time elapses.

7 is a diagram illustrating execution of an afterimage inverse compensation algorithm according to an embodiment of the present invention. 7 includes FIGS. 7(a), 7(b), and 7(c).

Referring to FIG. 7A, when an afterimage 10 occurs on the screen, the controller 130 controls the display panel 110 to display a message 710 indicating that an afterimage has occurred (S710). For example, the message could be Clear panel uniformity will start.

When an input 30 for selecting the residual image inverse compensation execution icon 20 is received from the user, the residual image inverse compensation application is executed (S730). For example, the afterimage reverse compensation execution icon 20 may be an OK icon.

Referring to FIG. 7B, the controller 130 executes an afterimage inverse compensation algorithm. If the display device 100 is activated again during the execution of the afterimage inverse compensation algorithm, execution of the afterimage inverse compensation algorithm is paused. When the afterimage inverse compensation algorithm is executed again later, the control unit 130 executes the afterimage inverse compensation algorithm again from the moment when the image is temporarily stopped.

Referring to FIG. 7C, when execution of the afterimage inverse compensation application is completed and the TV is turned on again, the controller 130 controls the display panel 110 to display a completion message 40. In this case, the completion message 40 is displayed in a pop-up format, and disappears from the screen when a predetermined time elapses.

Referring to FIG. 8, the x-axis means time, and the y-axis means luminance ratio. The luminance of the background region 810 and the luminance of the specific region 820 start at 100%. The luminance decrease slope of the background region 810 is gentle, and the luminance decrease slope of the specific region 820 is steeper than that of the background region 810. This is because deterioration occurs in the specific region 820, and the luminance decreases more quickly.

If the difference between the luminance of the background region 810 and the luminance of the specific region 820 is greater than or equal to a predetermined range, the controller 130 determines that an afterimage occurs and converts the luminance of the background region 810 to the luminance of the specific region 820. Correct.

For example, if the difference between the luminance of the background region 810 and the luminance of the specific region 820 is 5% or more, the controller 130 determines that an afterimage occurs, and determines the luminance of the background region 810 to the luminance of the specific region. Corrected to 820.

The technical meaning of the 5% difference in afterimage recognition will be explained. When the difference between the luminance of the background region 810 and the luminance of the specific region 820 is 4.5%, a person cannot perceive an afterimage, but in the case of 5%, a person may perceive an afterimage.

The lifetime of the display panel can be divided into a luminance lifetime and an afterimage lifetime.

The luminance lifetime refers to the time it takes for the current luminance to become 50% of the original luminance. In general, the luminance lifetime of the display panel is 30,000 hours or more.

The afterimage lifetime refers to the time it takes for the difference in luminance between the background area and the specific area to become more than a specific value. Here, the specific value may be 5%.

For example, for the 65-inch and 55-inch UHD models of the V15, it could be 7,000 hours. For the V16, 65-inch, and 55-inch UHD models, it could be 10,000 hours.

9 is a diagram showing a change in luminance over time and an OLED deterioration degree according to an embodiment of the present invention. 9 includes FIGS. 9(a) and 9(b).

The present invention can be divided into a measurement area, a data collection area, and a modeling area. In FIG. 9, a measurement area is described, a data collection area is described in FIG. 10, and a modeling area is described in FIG. 11.

9(a) is a diagram showing a change in luminance over time.

Referring to FIG. 9(a), the x-axis represents time, and the y-axis represents luminance. As time passes, the luminance gradually decreases from 100% to gradually, and the controller 130 controls the sensor unit 120 to sense a change in luminance over time.

9(b) is a diagram showing the degree of OLED deterioration over time.

Referring to FIG. 9B, the x-axis means time, and the y-axis means deterioration of the display panel. Here, the display panel may be an OLED. Deterioration of the display panel can be expressed by AR Drop. As time goes by, the degree of deterioration of the OLED starts at 0 and the magnitude of the degree of deterioration gradually increases, and the control unit 130 controls the sensor unit 120 to sense a change in OLED deterioration over time.

FIG. 10 is a graph showing a luminance change amount and an OLED deterioration degree over time according to an embodiment of the present invention. 10 illustrates a data collection area.

Referring to FIG. 10, the x-axis denotes a change in deterioration and the y-axis denotes a change in luminance. Specifically, the luminance change amount of FIG. 9 is reflected on the y-axis, and the deterioration change amount of FIG. 9 is reflected on the x-axis, and is shown in a graph.

The control unit 130 sets the amount of change in deterioration on the x-axis and the amount of change in luminance on the y-axis. The controller 130 displays a luminance change amount corresponding to the deterioration change amount as a graph, and stores the deterioration change amount and the luminance change amount in the memory 140. For example, the controller 130 may store the amount of change in deterioration and the amount of change in luminance in the memory 140 as a look-up table.

Referring to FIG. 10, a first luminance change amount is matched with a first deterioration change amount, and a second luminance change amount is matched with a second deterioration change amount. The fifth luminance change amount is matched with the fifth deterioration change amount.

11 is a diagram illustrating modeling a value compensated by a reduced luminance as a gain according to an embodiment of the present invention. In FIG. 11, a modeling area will be described.

Referring to FIG. 11, the x-axis denotes an amount of change in deterioration, and the y-axis denotes a value obtained by converting a value for compensating by a luminance that decreases over time into a gain.

The controller 130 calculates a compensation gain for compensating for the luminance reduced in the display panel 110 based on the luminance change amount. Specifically, the control unit 130 calculates a compensation gain based on the amount of luminance change in FIG. 10 and stores it as a lookup-table. This is to immediately calculate the compensation gain later, referring to the lookup-table.

The modeling line can be represented linearly. Referring to FIG. 11, the controller 130 adjusts the compensation gain so that the amount of deterioration change and the calculated compensation gain become linear.

From a system point of view, if it becomes a linear system, it means that when multiple signals enter a system, the characteristics of the system affect each signal separately. For example, when two different signals are input to a single system, it means that the characteristics of the system change independently without mixing the two signals, and no correlation occurs between the two signals.

According to the present invention, a meaningful result can be obtained by adjusting the compensation gain so that the amount of deterioration change and the compensation gain become linear with each other.

Referring to FIG. 12, the x-axis represents the luminance lifetime and the unit is time. The y-axis means luminance. The luminance starts at 100% and gradually decreases.

In the case of the background region luminance curve 1210, the luminance decreases over time. The luminance curve 1220 of a specific region decreases with time. In addition, the decreasing slope of the luminance curve 1220 of the specific region is greater than the luminance curve 1210 of the background region. This is because the deterioration proceeds in a specific area and the brightness becomes darker.

When the difference in size between the luminance curve 1220 of the specific region and the luminance curve 1210 of the background region is greater than or equal to a predetermined range, the controller 130 generates a luminance curve 1230 of a new background region. Here, the predetermined range may be 5%. If it is more than 5%, the user will recognize the afterimage. Accordingly, the controller 130 generates a luminance curve 1230 of a new background region in which the luminance is lowered to the level of the specific region.

The controller 130 controls the display panel 110 to display the image data based on the luminance curve of the generated new background area.

Also, the controller 130 generates a luminance curve of a second new background region when the difference in size between the luminance curve of the new background region and the luminance curve of the specific region is greater than or equal to a predetermined range. Here, the new background area means a first new background area, and the predetermined range may be 5%. Accordingly, the control unit 130 generates a luminance curve 1230-2 of the second new background region in which the luminance is lowered to the level of the specific region.

The controller 130 controls the display panel 110 to display the image data based on the luminance curve 1230-2 of the generated second new background area.

The controller 130 may continuously generate a luminance curve of a new background area until the luminance reaches a preset first luminance. Here, the first luminance may be 50%. When the luminance becomes less than or equal to the first luminance, the control unit 130 stops generating the luminance curve of the new background area. This is because when the luminance is less than the first luminance, the screen becomes dark and it is inconvenient for the user to view the screen.

Referring to FIG. 13, the x-axis represents the luminance lifetime and the unit is time. The y-axis means luminance. The luminance starts at 100% and gradually decreases.

The background region luminance curve 1310 decreases in luminance over time. The luminance curve 1320 of a specific region decreases as time passes. In addition, the decreasing slope of the luminance curve 1320 of the specific region is greater than the luminance curve 1310 of the background region. This is because the deterioration proceeds in a specific area and the brightness becomes darker.

When the luminance rapidly decreases, displaying a warning message will be described. The controller 130 controls the display panel 110 to display a warning message when the difference in size between the luminance curve 1320 of the specific area and the luminance curve 1310 of the background area exceeds a predetermined range within a predetermined time. Here, the predetermined range may be 5%. If it is more than 5%, the user will recognize the afterimage. Accordingly, the control unit 130 generates a luminance curve 1230 of a new background region with lower luminance.

However, in this case, even if the controller 130 generates a luminance curve of a new background region, since the decrease slope of the luminance curve 1320 of a specific region increases rapidly, the luminance curve 1320 of the specific region and the The difference in the luminance curve of the new background area continues to exceed the predetermined range. So, in this case, the controller 130 controls the display panel 110 to display a warning message.

Referring to Fig. 14, an afterimage evaluation pattern is illustrated.

The judgment criteria will be described. Based on daily video average and maximum value, luminance afterimage, L 5% (White) 10% (R/G/B), color afterimage: u'v,'0.015(White), X 15 times acceleration pattern (white) Determine the afterimage.

The evaluation conditions will be described. The temperature evaluated during measurement and operation is based on room temperature. Here, room temperature means 25 degrees Celsius. Next, algorithm conditions will be described. Algorithm means TPC, CPC, Temp, LEA, WCT, HDR. According to an embodiment of the present invention, TPC may be in an off state, CPC may be in an off state, Temp may be in an off state, LEA may be in an off state, WCT may be in an ON state, and HDR may be in an ON state.

The measurement method and measurement period will be described.

The measurement method can be FW / R / G / B, APL 100% DPTJ 255 gray. The measurement cycle can be performed once a day, and in the case of Off RS, it can be performed twice.

A method of predicting an afterimage will be described.

The basic afterimage is obtained when the difference in luminance between a specific area and a background area is 5% or more, or by multiplying the color residual image u'v' 0.015 arrival time (fitting by actual measurement) by 15 times.

For example, in the case of 500 hours of basic afterimage, if the acceleration evaluation is satisfied, it is 7,500 hours. The afterimage prediction means the product of the basic afterimage and the effect of the afterimage correction.

The luminance acceleration coefficient will be described.

The luminance acceleration coefficient can be classified into white, red, green, and blue. In the case of white, n = 1.80, in the case of red, n = 2.04, in the case of green, n = 1.95, and in the case of blue, n = 1.44.

Referring to FIG. 15, maximum and average values of luminance specifications of daily video and heavy video are shown.

16 is a diagram illustrating that an afterimage occurs in a logo of a broadcaster according to an embodiment of the present invention. Fig. 16 includes Figs. 16(a), 16(b), and 16(c).

Referring to FIG. 16A, the screen may be divided into a specific area 1610 and a background area 1620.

Since the specific area 1610 is an area including the logo and is continuously displayed on the screen, deterioration occurs. The background area 1620 is relatively less deteriorated than the specific area because the screen is changed.

16B is an enlarged view of the specific area 1610. Referring to FIG. 16B, a specific area 1610 may include a broadcaster logo. In the case of the broadcaster logo, since it is continuously displayed on the screen while watching the smart TV, the OLED of the display panel corresponding to the specific area 1610 is deteriorated.

16(c) is a diagram showing that an afterimage has occurred in a specific area 1610. When an afterimage occurs in the specific area 1610, the brightness is darker than that of the background area 1620 so that the user can recognize it.

According to the present invention, instead of adjusting the luminance of the specific region 1610, when the difference between the luminance of the specific region and the luminance of the background region exceeds a predetermined range, the luminance of the background region 1620 is adjusted to control the specific region 1610. ) And the background area 1620 are made equal to prevent a user from recognizing an afterimage.

The controller 130 adjusts the luminance of the background region 1620 to the luminance of the specific region 1610 by reducing the gray level level for each of the plurality of pixels in the background region 1620.

The image display device and its operation method according to the present invention are not limited to the configuration and method of the embodiments described as described above, but the embodiments are all or part of each embodiment so that various modifications can be made. May be configured by selectively combining.

Meanwhile, the method of operating a video display device of the present invention may be implemented as a code that can be read by a processor on a recording medium that can be read by a processor provided in the video display device. The processor-readable recording medium includes all types of recording devices that store data that can be read by the processor. Examples of recording media that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and also include those implemented in the form of carrier waves such as transmission through the Internet. . Further, the processor-readable recording medium is distributed over a computer system connected through a network, so that the processor-readable code can be stored and executed in a distributed manner.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains, various modifications and variations can be made without departing from the essential characteristics of the present invention. Accordingly, the embodiments expressed in the present invention are not intended to limit the technical idea of the present invention, but to illustrate, and the scope of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas equivalent to or within the scope should be construed as being included in the scope of the present invention.

Various embodiments have been described in the best mode for carrying out the present invention.

The present invention is used in a related field of a display device for removing an afterimage by sensing a deteriorated region of a display panel in which an afterimage occurs, and correcting the luminance of a region other than the deteriorated region.

It is apparent to those skilled in the art that various changes and modifications are possible in the present invention without departing from the spirit or scope of the present invention. Accordingly, the present invention is intended to cover modifications and variations of the present invention provided within the appended claims and their equivalents.

Claims

In the display device,

A display panel including a plurality of pixels;

A sensor unit sensing the degree of deterioration of the plurality of pixels and the luminance of the plurality of pixels; And

Controlling the constant sensor unit to sense the luminance of a specific region corresponding to the deterioration region and the luminance of a background region excluding the specific region of the entire region,

And a control unit for correcting the luminance of the background region based on the difference in luminance of the background region and the luminance of the specific region.

Display device.
The method of claim 1,

Further comprising a memory for storing a gain value for correcting the luminance of the specific region to the luminance of the background region in a lookup-table format,

The control unit

Controlling the sensor unit to sense the degree of deterioration of the plurality of pixels,

Based on the sensing result, the entire area of the display area is divided into a deteriorated area and a non-degraded area,

Referring to the lookup table of the memory, the luminance of the background region is corrected by inverse compensation with the luminance of the specific region,

Generating image data of the specific region and the corrected background region,

Controlling the display panel to display the generated image data,

Display device.
The method of claim 1, wherein the control unit

When an afterimage occurs on the screen, the display panel is controlled to display a message indicating that the afterimage has occurred,

When an input for selecting the afterimage correction execution icon is received from the user, the afterimage correction application is executed,

When the execution of the afterimage correction application is completed, controlling the display panel to display a completion message,

Display device.
The method of claim 1, wherein the control unit

If the difference between the luminance of the background region and the luminance of the specific region is more than a predetermined range, it is determined that an afterimage occurs,

Correcting the luminance of the background region to the luminance of the specific region,

Display device.
The method of claim 1, wherein the control unit

Controlling the sensor unit to sense a change in luminance over time and to sense a change in deterioration over time,

Display device.
The method of claim 5, wherein the control unit

Set the amount of deterioration change on the x-axis,

Set the amount of luminance change on the y-axis,

Displaying the luminance change amount corresponding to the deterioration change amount in a graph,

Storing the amount of change in deterioration and the amount of change in luminance in a memory,

Display device.
The method of claim 6, wherein the control unit

Calculating a compensation gain for compensating for the reduced luminance in the display panel based on the luminance change amount,

Display device.
The method of claim 7, wherein the control unit

Adjusting the compensation gain so that the amount of deterioration change and the calculated compensation gain become linear,

Display device.
The method of claim 1, wherein the control unit,

If the difference in size between the deteriorated luminance curve and the background luminance curve is more than a predetermined range, a new background luminance curve is generated,

Controlling the display panel to display the image data based on the generated new background luminance curve,

Display device.
The method of claim 1, wherein the control unit

When the difference in size between the deterioration luminance curve and the background luminance curve exceeds a predetermined range within a predetermined time, controlling the display panel to display a warning message,

Display device.
In the control method of the display device,

Controlling to sense a degree of deterioration of a plurality of pixels constituting the display panel ;

Dividing the entire area of the display area into a deteriorated area and a non-degraded area based on the sensing result;

Controlling a sensor unit to sense the luminance of a specific region corresponding to the deterioration region and a luminance of a background region excluding the specific region of the entire region;

Correcting the luminance of the background region based on a difference between the luminance of the background region and the luminance of the specific region;

Generating image data of the specific region and the corrected background region; And

Controlling the display panel to display the generated image data

Control method of a display device comprising a.
The method of claim 11,

Further comprising correcting the luminance of the background region to the luminance of the specific region by inverse compensation by referring to the lookup table of the memory,

Display device control method.
The method of claim 11,

When an afterimage occurs on a screen, controlling the display panel to display a message indicating that an afterimage has occurred;

When an input for selecting an afterimage correction execution icon is received from a user, executing an afterimage correction application; And

When the execution of the afterimage correction application is completed, further comprising controlling the display panel to display a completion message,

Display device control method.
The method of claim 11,

Determining that an afterimage occurs when the difference between the luminance of the background region and the luminance of the specific region is greater than or equal to a predetermined range; And

Compensating the luminance of the background region to the luminance of the specific region,

Display device control method.
The method of claim 11,

Further comprising the step of controlling the sensor unit to sense a change in luminance over time and a change in deterioration over time,

Display device control method.
The method of claim 15,

Setting the amount of change in deterioration in the x-axis;

Setting a luminance change amount on the y-axis;

Displaying the luminance change amount corresponding to the deterioration change amount in a graph; And

The step of storing the change amount of deterioration and the change amount of luminance in a memory, further comprising,

Display device control method.
The method of claim 16,

Further comprising the step of calculating a compensation gain for compensating the reduced luminance in the display panel based on the luminance change amount,

Display device control method.
The method of claim 17,

Further comprising the step of adjusting the compensation gain so that the deterioration change amount and the calculated compensation gain become linear,

Display device control method.
The method of claim 11,

Generating a new background luminance curve when the difference in size between the deteriorated luminance curve and the background luminance curve is greater than or equal to a predetermined range;

Further comprising controlling the display panel to display the image data based on the generated new background luminance curve,

Display device control method.
The method of claim 11,

The step of controlling the display panel to display a warning message when the difference in size between the deterioration luminance curve and the background luminance curve exceeds a predetermined range within a predetermined time,

Display device control method.