WO2021029469A1 - Display device and operation method therefor - Google Patents

Abstract

The present invention pertains to a display device for minimizing the possibility of a residual image on the edge portion of an image area, and an operation method therefor, the device comprising: a display unit for displaying an image; and a control unit for moving an image area if the non-mobile time of the image area in which an image is played exceeds a residence time.

Description

Display device and its operating method

The present invention relates to a display device and a method of operating the same, and more particularly, to a display device for improving an afterimage problem and a method of operating the same.

In recent years, the types of display devices are increasing. Among them, organic light emitting diode display devices (hereinafter referred to as OLED display devices) are widely used.

Since the OLED display device is a self-luminous device, compared to a liquid crystal display device requiring a backlight, power consumption is low and has an advantage that it can be manufactured thin. In addition, the OLED display device has a wide viewing angle and a fast response speed.

The OLED display device includes a plurality of pixels, and may display images of various colors through the pixels. That is, the OLED display device may display an image by supplying a predetermined current to each of a plurality of pixels according to the image data.

At this time, if a high current is continuously supplied to the pixel, deterioration may occur, and if the lifespan is shortened and burn-in, an afterimage problem that appears to remain even when the image is not output occurs. I can.

One of the conventional methods for improving this afterimage problem is a method of gradually moving the position of an image every predetermined time. However, in this case, if the position of the image is frequently moved, the user may feel inconvenience when viewing the image.

An object of the present invention is to provide a display device that minimizes the possibility of occurrence of an afterimage while minimizing a case where a user perceives a change in an image position, and an operating method thereof.

An object of the present invention is to provide a display device and a method of operating the same, which minimizes the possibility of an afterimage occurring in an edge region of an image.

The display device according to an exemplary embodiment of the present invention may include a display unit that displays an image, and a controller that moves the image area when the non-moving time of the image area in which the image is reproduced exceeds the remaining time.

The control unit may calculate the remaining time based on the luminance and color change amount of the image.

The control unit can calculate a shorter residence time as the luminance increases.

The control unit may calculate a shorter residence time as the color change amount increases.

When the luminance is the first luminance and the color change amount is the first value, the control unit calculates the residence time as the first time, and when the luminance is the first luminance and the color change amount is a second value smaller than the first value, the residence time is first It can be calculated as a second time longer than the time.

When the luminance is the first luminance and the color change amount is the first value, the control unit calculates the residence time as the first time, and when the luminance is the second luminance smaller than the first luminance, and the color change amount is the first value, It can be calculated as a second time longer than the time.

When the non-moving time is less than the remaining time and the non-moving time exceeds the threshold time, the control unit may move the image area.

The controller may calculate the residual time based on pixel data of an area within a set distance from the non-image area among the image areas.

When an image is being played and a screen protection function is being executed, the controller may move the image area by comparing the non-moving time and the remaining time.

When the image is being reproduced in a smaller size than the full screen, the controller may move the image region by comparing the non-moving time and the remaining time of the image.

According to an exemplary embodiment of the present invention, since the image region is moving, a problem of occurrence of an afterimage may be reduced, and a possibility of a user recognizing a change in the image region may be reduced, thereby minimizing user discomfort.

In addition, since the period in which the image region moves and the amount of movement are adjusted according to the characteristics of the image such as luminance and color change, there is an advantage in that the probability of occurrence of an afterimage can be adaptively reduced according to the characteristics of the image.

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

2 is a block diagram of a remote control device according to an embodiment of the present invention.

3 shows an example of an actual configuration of a remote control device according to an embodiment of the present invention.

4 shows an example of using a remote control device according to an embodiment of the present invention.

5 is an exemplary diagram illustrating a method of operating a display device according to a first embodiment of the present invention to improve an afterimage problem.

6 is an exemplary diagram illustrating a method of operating a display device according to a second embodiment of the present invention to improve an afterimage problem.

7 is a flowchart illustrating a method of operating a display device to improve an afterimage problem according to a third exemplary embodiment of the present invention.

8 is an exemplary diagram illustrating a specific area of an image for calculating a residual time by a display device according to an exemplary embodiment of the present invention.

9 is an exemplary diagram for explaining a method of calculating a residual time according to a luminance and a color change amount by a display device according to an exemplary embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. 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 themselves have distinct meanings or roles.

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

Referring to FIG. 1, the display device 100 includes a broadcast receiving unit 130, an external device interface unit 135, a storage unit 140, a user input interface unit 150, a control unit 170, and a wireless communication unit 173. , A voice acquisition unit 175, a display unit 180, an audio output unit 185, and a power supply unit 190 may be included.

The broadcast reception unit 130 may include a tuner 131, a demodulation unit 132, and a network interface unit 133.

The tuner 131 may select a specific broadcast channel according to a channel selection command. The tuner 131 may receive a broadcast signal for a selected specific broadcast channel.

The demodulator 132 may divide the received broadcast signal into a video signal, an audio signal, and a data signal related to a broadcast program, and restore the separated video signal, audio signal, and data signal into a form capable of outputting.

The network interface unit 133 may provide an interface for connecting the display device 100 to a wired/wireless network including an Internet network. The network interface unit 133 may transmit or receive data with other users or other electronic devices through a connected network or another network linked to the connected network.

The network interface unit 133 may access a predetermined web page through a connected network or another network linked to the connected network. That is, by accessing a predetermined web page through a network, the server and data can be transmitted or received.

In addition, the network interface unit 133 may receive content or data provided by a content provider or a network operator. That is, the network interface unit 133 may receive content such as movies, advertisements, games, VODs, broadcast signals, and related information provided from a content provider or a network provider through a network.

In addition, the network interface unit 133 may receive update information and an update file of firmware provided by a network operator, and transmit data to the Internet or content provider or network operator.

The network interface unit 133 may select and receive a desired application from among applications open to the public through a network.

The external device interface unit 135 may receive an application or an application list in an adjacent external device and transmit it to the control unit 170 or the storage unit 140.

The external device interface unit 135 may provide a connection path between the display device 100 and the external device. The external device interface unit 135 may receive one or more of an image and audio output from an external device connected to the display device 100 by wire or wirelessly, and transmit it to the control unit 170. The external device interface unit 135 may include a plurality of external input terminals. The plurality of external input terminals may include an RGB terminal, one or more HDMI (High Definition Multimedia Interface) terminals, and a component terminal.

An image signal of an external device input through the external device interface unit 135 may be output through the display unit 180. The audio signal of the external device input through the external device interface unit 135 may be output through the audio output unit 185.

The external device connectable to the external device interface unit 135 may be any one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB memory, and a home theater, but this is only an example. .

In addition, some content data stored in the display apparatus 100 may be transmitted to another user registered in advance in the display apparatus 100 or a selected user or a selected electronic device among other electronic devices.

The storage unit 140 may store a program for processing and controlling each signal in the control unit 170 and may store signal-processed video, audio, or data signals.

In addition, the storage unit 140 may perform a function for temporary storage of a video, audio, or data signal input from the external device interface unit 135 or the network interface unit 133. You can also store information about the image.

The storage unit 140 may store an application or an application list input from the external device interface unit 135 or the network interface unit 133.

The display device 100 may reproduce and provide a content file (movie file, still image file, music file, document file, application file, etc.) stored in the storage unit 140 to a user.

The user input interface unit 150 may transmit a signal input by the user to the controller 170 or may transmit a signal from the controller 170 to the user. For example, the user input interface unit 150 may be configured according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee method, Radio Frequency (RF) communication method, or infrared (IR) communication method, Control signals such as power on/off, channel selection, and screen setting may be received and processed from the remote control device 200, or a control signal from the control unit 170 may be transmitted to the remote control device 200.

In addition, the user input interface unit 150 may transmit a control signal input from a local key (not shown) such as a power key, a channel key, a volume key, and a set value to the control unit 170.

The image signal processed by the controller 170 may be input to the display unit 180 and displayed as an image corresponding to the corresponding image signal. Also, the image signal processed by the controller 170 may be input to an external output device through the external device interface unit 135.

The audio signal processed by the controller 170 may be audio output to the audio output unit 185. In addition, the voice signal processed by the control unit 170 may be input to an external output device through the external device interface unit 135.

In addition, the controller 170 may control the overall operation of the display apparatus 100.

In addition, the control unit 170 may control the display device 100 by a user command or an internal program input through the user input interface unit 150, and access the network to display an application or application list desired by the user. It can be downloaded within (100).

The control unit 170 enables channel information selected by the user to be output through the display unit 180 or the audio output unit 185 together with the processed image or audio signal.

In addition, the control unit 170, in accordance with the external device image playback command received through the user input interface unit 150, from an external device input through the external device interface unit 135, for example, a camera or a camcorder, An image signal or an audio signal may be output through the display unit 180 or the audio output unit 185.

Meanwhile, the control unit 170 may control the display unit 180 to display an image, for example, a broadcast image input through the tuner 131 or an external input input through the external device interface unit 135 An image, an image input through the network interface unit, or an image stored in the storage unit 140 may be controlled to be displayed on the display unit 180. In this case, the image displayed on the display unit 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

In addition, the control unit 170 may control content stored in the display device 100, received broadcast content, or external input content input from the outside to be played, and the content includes a broadcast image, an external input image, an audio file, and a stop. It may be in various forms such as an image, a connected web screen, and a document file.

The wireless communication unit 173 may communicate with an external device through wired or wireless communication. The wireless communication unit 173 may perform short range communication with an external device. To this end, the wireless communication unit 173 includes Bluetooth™, Bluetooth Low Energy (BLE), Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, and NFC (Near NFC). Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless Universal Serial Bus (USB) technologies may be used to support short-range communication. The wireless communication unit 173 may be configured between the display device 100 and a wireless communication system, between the display device 100 and another display device 100, or between the display device 100 and the display device 100 through wireless area networks. Wireless communication between networks in which the display device 100 or an external server is located may be supported. The local area wireless communication networks may be wireless personal area networks (Wireless Personal Area Networks).

Here, the other display device 100 is a wearable device capable of exchanging (or interlocking with) data with the display device 100 according to the present invention, for example, a smartwatch, smart glasses. (smart glass), HMD (head mounted display)), it can be a mobile terminal such as a smart phone. The wireless communication unit 173 may detect (or recognize) a wearable device capable of communicating around the display apparatus 100. Further, when the sensed wearable device is an authenticated device to communicate with the display apparatus 100 according to the present invention, the controller 170 transmits at least a portion of the data processed by the display apparatus 100 to the wireless communication unit ( 173) can be transmitted to the wearable device. Accordingly, a user of the wearable device may use data processed by the display apparatus 100 through the wearable device.

The voice acquisition unit 175 may acquire audio. The voice acquisition unit 175 may include at least one microphone (not shown), and may acquire audio around the display apparatus 100 through a microphone (not shown).

The display unit 180 converts an image signal, a data signal, an OSD signal processed by the control unit 170, or an image signal and a data signal received from the external device interface unit 135 into R, G, and B signals, respectively. Can generate signals.

Meanwhile, since the display device 100 shown in FIG. 1 is only an embodiment of the present invention. Some of the illustrated components may be integrated, added, or omitted according to the specifications of the display device 100 that is actually implemented.

That is, if necessary, two or more components may be combined into a single component, or one component may be subdivided into two or more components and configured. In addition, functions performed by each block are for explaining an embodiment of the present invention, and specific operations or devices thereof do not limit the scope of the present invention.

According to another embodiment of the present invention, unlike FIG. 1, the display apparatus 100 does not include a tuner 131 and a demodulation unit 132, but a network interface unit 133 or an external device interface unit ( 135) can also be received and played.

For example, the display device 100 is implemented by being divided into an image processing device such as a set-top box for receiving broadcast signals or contents according to various network services, and a content reproducing device for reproducing content input from the image processing device. Can be.

In this case, the method of operating the display device according to an embodiment of the present invention to be described below is not only the display device 100 as described with reference to FIG. 1, but also an image processing device or display unit 180 such as a separate set-top box. ) And the audio output unit 185 may be performed by any one of a content playback device.

The audio output unit 185 receives a signal processed by the control unit 170 and outputs it as a voice.

The power supply unit 190 supplies corresponding power to the entire display apparatus 100. In particular, power is supplied to the control unit 170 that can be implemented in the form of a System On Chip (SOC), the display unit 180 for image display, and the audio output unit 185 for audio output. I can.

Specifically, the power supply unit 190 may include a converter that converts AC power into DC power and a dc/dc converter that converts the level of DC power.

Next, a remote control device according to an embodiment of the present invention will be described with reference to FIGS. 2 to 3.

2 is a block diagram of a remote control device according to an embodiment of the present invention, and FIG. 3 is a block diagram showing an example of an actual configuration of a remote control device according to an embodiment of the present invention.

First, referring to FIG. 2, the remote control device 200 includes a fingerprint recognition unit 210, a wireless communication unit 220, a user input unit 230, a sensor unit 240, an output unit 250, and a power supply unit 260. ), a storage unit 270, a control unit 280, and a voice acquisition unit 290.

Referring to FIG. 2, the wireless communication unit 220 transmits and receives signals to and from any one of the display devices according to the exemplary embodiments described above.

The remote control device 200 includes an RF module 221 capable of transmitting and receiving signals with the display device 100 according to the RF communication standard, and capable of transmitting and receiving signals with the display device 100 according to the IR communication standard. An IR module 223 may be provided. In addition, the remote control device 200 may include a Bluetooth module 225 capable of transmitting and receiving signals to and from the display device 100 according to the Bluetooth communication standard. In addition, the remote control device 200 includes an NFC module 227 capable of transmitting and receiving signals with the display device 100 according to the NFC (Near Field Communication) communication standard, and the display according to the WLAN (Wireless LAN) communication standard. A WLAN module 229 capable of transmitting and receiving signals to and from the device 100 may be provided.

In addition, the remote control device 200 transmits a signal containing information about the movement of the remote control device 200 to the display device 100 through the wireless communication unit 220.

On the other hand, the remote control device 200 may receive a signal transmitted from the display device 100 through the RF module 221, and power on/off the display device 100 through the IR module 223 as necessary. Commands for off, channel change, volume change, etc. can be transmitted.

The user input unit 230 may be composed of a keypad, a button, a touch pad, or a touch screen. A user may input a command related to the display device 100 to the remote control device 200 by manipulating the user input unit 230. When the user input unit 230 includes a hard key button, the user may input a command related to the display device 100 to the remote control device 200 through a push operation of the hard key button. This will be described with reference to FIG. 3.

Referring to FIG. 3, the remote control device 200 may include a plurality of buttons. The plurality of buttons include a fingerprint recognition button 212, a power button 231, a home button 232, a live button 233, an external input button 234, a volume control button 235, a voice recognition button 236, A channel change button 237, a confirmation button 238, and a back button 239 may be included.

The fingerprint recognition button 212 may be a button for recognizing a user's fingerprint. As an example, the fingerprint recognition button 212 is capable of a push operation and may receive a push operation and a fingerprint recognition operation. The power button 231 may be a button for turning on/off power of the display apparatus 100. The home button 232 may be a button for moving to the home screen of the display device 100. The live button 233 may be a button for displaying a real-time broadcast program. The external input button 234 may be a button for receiving an external input connected to the display device 100. The volume control button 235 may be a button for adjusting the volume of the volume output by the display apparatus 100. The voice recognition button 236 may be a button for receiving a user's voice and recognizing the received voice. The channel change button 237 may be a button for receiving a broadcast signal of a specific broadcast channel. The confirmation button 238 may be a button for selecting a specific function, and the back button 239 may be a button for returning to a previous screen.

2 will be described again.

When the user input unit 230 includes a touch screen, the user may input a command related to the display device 100 to the remote control device 200 by touching a soft key on the touch screen. In addition, the user input unit 230 may include various types of input means that a user can manipulate, such as a scroll key or a jog key, and the present embodiment does not limit the scope of the present invention.

The sensor unit 240 may include a gyro sensor 241 or an acceleration sensor 243, and the gyro sensor 241 may sense information about the movement of the remote control device 200.

For example, the gyro sensor 241 may sense information on the operation of the remote control device 200 based on the x, y, and z axes, and the acceleration sensor 243 is the moving speed of the remote control device 200 Information about the back can be sensed. On the other hand, the remote control device 200 may further include a distance measuring sensor, so that the distance to the display unit 180 of the display device 100 may be sensed.

The output unit 250 may output an image or audio signal corresponding to an operation of the user input unit 230 or a signal transmitted from the display apparatus 100. Through the output unit 250, the user may recognize whether the user input unit 230 is operated or whether the display apparatus 100 is controlled.

For example, the output unit 250 includes an LED module 251 that lights up when the user input unit 230 is operated or a signal is transmitted and received with the display device 100 through the wireless communication unit 220, and a vibration module that generates vibration ( 253), a sound output module 255 for outputting sound, or a display module 257 for outputting an image may be provided.

In addition, the power supply unit 260 supplies power to the remote control device 200, and when the remote control device 200 has not moved for a predetermined period of time, the power supply is stopped, thereby reducing power waste. The power supply unit 260 may resume power supply when a predetermined key provided in the remote control device 200 is operated.

The storage unit 270 may store various types of programs, application data, and the like necessary for controlling or operating the remote control device 200. If the remote control device 200 wirelessly transmits and receives signals through the display device 100 and the RF module 221, the remote control device 200 and the display device 100 transmit and receive signals through a predetermined frequency band. .

The control unit 280 of the remote control device 200 stores information about a frequency band through which signals can be wirelessly transmitted and received with the display device 100 paired with the remote control device 200 in the storage unit 270 and is referred to. can do.

The controller 280 controls all matters related to the control of the remote control device 200. The controller 280 transmits a signal corresponding to the operation of a predetermined key by the user input unit 230 or a signal corresponding to the movement of the remote control device 200 sensed by the sensor unit 240 through the wireless communication unit 220. 100).

In addition, the voice acquisition unit 290 of the remote control device 200 may acquire voice.

The voice acquisition unit 290 may include at least one microphone 291, and may acquire a voice through the microphone 291.

Next, FIG. 4 will be described.

4 shows an example of using a remote control device according to an embodiment of the present invention.

4A illustrates that a pointer 205 corresponding to the remote control device 200 is displayed on the display unit 180.

The user can move or rotate the remote control device 200 up and down, left and right. The pointer 205 displayed on the display unit 180 of the display device 100 corresponds to the movement of the remote control device 200. As shown in the drawing, since the corresponding pointer 205 is moved and displayed according to movement in the 3D space, the remote control device 200 may be referred to as a space remote controller.

4B illustrates that when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display unit 180 of the display device 100 also moves to the left in response thereto.

Information on the movement of the remote control device 200 detected through a sensor of the remote control device 200 is transmitted to the display device 100. The display device 100 may calculate the coordinates of the pointer 205 from information about the movement of the remote control device 200. The display apparatus 100 may display the pointer 205 to correspond to the calculated coordinates.

4C illustrates a case where a user moves the remote control device 200 away from the display unit 180 while pressing a specific button in the remote control device 200. Accordingly, the selection area in the display unit 180 corresponding to the pointer 205 may be zoomed in and displayed in an enlarged manner.

Conversely, when the user moves the remote control device 200 to be close to the display unit 180, a selection area in the display unit 180 corresponding to the pointer 205 may be zoomed out and displayed in a reduced size.

Meanwhile, when the remote control device 200 moves away from the display unit 180, the selection area may be zoomed out, and when the remote control device 200 approaches the display unit 180, the selection area may be zoomed in.

In addition, when a specific button in the remote control device 200 is pressed, recognition of vertical and horizontal movement may be excluded. That is, when the remote control device 200 moves away from or approaches the display unit 180, up, down, left, and right movements are not recognized, but only forward and backward movements may be recognized. In a state in which a specific button in the remote control device 200 is not pressed, only the pointer 205 is moved according to the up, down, left, and right movement of the remote control device 200.

Meanwhile, the moving speed or moving direction of the pointer 205 may correspond to the moving speed or moving direction of the remote control device 200.

Meanwhile, in this specification, a pointer refers to an object displayed on the display unit 180 in response to an operation of the remote control device 200. Accordingly, the pointer 205 can be used to make objects of various shapes other than the arrow shape shown in the drawing. For example, it may be a concept including a point, a cursor, a prompt, and a thick outline. In addition, the pointer 205 may be displayed in correspondence with any one of a horizontal axis and a vertical axis on the display unit 180, as well as a plurality of points such as a line and a surface. Do.

The display device 100 may reproduce a video in the form of a picture in graphics (PIG).

The PIG form may mean a form in which an image is reproduced within a graphics area. That is, the PIG form may mean a form in which an image is reproduced in a size smaller than the size of the entire screen.

On the other hand,'PIG form' is only named for convenience of explanation, and is not limited to the name.

When an image is being reproduced in the form of a PIG, the controller 170 may improve an afterimage problem by hiding an area other than the image when a user input is not received for a preset time.

5 is an exemplary diagram illustrating a method of operating a display device according to a first embodiment of the present invention to improve an afterimage problem.

When the display 180 displays an image in the form of a PIG, an image area 51 and a non-image area 59 may exist on the screen.

The image area 51 is an area in which an image being played is displayed, and the non-image area 59 may be the rest area except for the image image area 51. In FIG. 5, only one image region 51 is shown, but the number of image regions 51 may be two or more.

The non-image area 59 may be an area displayed by an On Screen Display (OSD) signal. The OSD signal may be a signal for displaying various types of information on the screen of the display unit 180 as a graphic or text based on a user input signal.

The non-image area 59 may include a user interface screen, various menu screens, widgets, icons, and the like. Referring to the example of FIG. 5, the non-image area 59 may include various menus 52 and 53, user interfaces 54 and 55, and banners 56.

In addition, as shown in FIG. 5A, a portion 56 of the non-image area 59 may be displayed by overlapping a portion of the image area 51.

The control unit 170 may execute a screen protection function if a user input is not detected for a preset time while an image is being played. The controller 170 may remove the non-image area 59 by executing the screen protection function. As shown in (b) of FIG. 5, the controller 170 may not display the non-image area 59 except for the image area 51.

When the controller 170 displays information according to the OSD signal on the graphic layer and displays an image being played on the video layer, the display unit 180 may output a screen by combining the graphic layer and the video layer. Accordingly, when the graphic layer is removed when the screen protection function is executed, the controller 170 may be black because nothing is output from the non-image area 59.

Meanwhile, when a user input is detected while the non-image region 59 is removed, the controller 170 may display the non-image region 59 again.

In this way, the control unit 170 minimizes the occurrence of an afterimage in the non-image area 59 by not displaying the remaining areas except for the image area 51 if no user input is detected for a certain period of time while the image is being played can do.

On the other hand, according to the second embodiment of the present invention, the display apparatus 100 changes the image region 51 at regular intervals while removing the non-image region 59 as the screen protection function is executed. In addition to the afterimage in (59), occurrence of an afterimage at the boundary between the image region 51 and the non-image region 59 may be minimized.

6 is an exemplary diagram illustrating a method of operating a display device according to a second embodiment of the present invention to improve an afterimage problem.

According to the second embodiment of the present invention, if a user input is not detected for more than a preset time while an image is being played, the controller 170 removes the remaining area 59 except for the image area 51, and 51 can be controlled to move in a certain period. A method of removing the non-image area 59 is the same as that described in FIG. 5, and therefore, a duplicate description will be omitted. Hereinafter, it will be described in detail that the image region 51 is moved at a predetermined period.

By removing the non-image area 59, the control unit 170 may move the position of the image area 51 every predetermined period when only the image area 51 is displayed.

For example, the control unit 170 may move the image area 51 by 1 pixel per 10 seconds. Specifically, as shown in FIG. 6, when a preset period elapses in a state in which the image is displayed in the first area 61, the control unit 170 changes the display position of the image from the first area 61 to the second area. It can be changed to the area 62. Likewise, the controller 170 changes the display position of the image from the second area 62 to the third area 63 when a preset period elapses while displaying the image in the second area 62, and When a preset period elapses while the image is displayed in the region 63, the display position of the image may be changed from the third region 63 to the fourth region 64. In addition, the controller 170 may change the display position of the image from the fourth region 64 to the first region 61 when a predetermined period elapses while the image is displayed in the fourth region 64. That is, according to the example of FIG. 6, the controller 170 may periodically move the display position of the image within the setting range 60.

In this case, it is possible to minimize the occurrence of an afterimage around the edge of the image area 51. Specifically, when the non-image region 59 is removed and the image is displayed only in the image region 51, the image region 51 is displayed due to the difference in luminance between the image region 51 and the non-image region 59. An afterimage may occur on the border of ). However, as in the second embodiment, when the image area 51 is moved at a certain period, the edge position of the image area 51 is changed at a certain period, so that the possibility of occurrence of an afterimage at the border of the image area 51 can be reduced. There is an advantage.

Meanwhile, according to the third embodiment of the present invention, when the display device 100 moves the image region 51 while removing the non-image region 59 as the screen protection function is executed, the movement period according to the image It is possible to minimize a case in which the user perceives a change in the position of the image area 51 by adjusting.

That is, when the non-moving time of the image region in which the image is reproduced exceeds the remaining time, the controller 170 moves the image region, thereby improving an afterimage problem in the edge region of the image region. Hereinafter, it will be described in more detail with reference to FIGS. 7 to 9.

7 is a flowchart illustrating a method of operating a display device to improve an afterimage problem according to a third exemplary embodiment of the present invention.

The control unit 170 may execute a screen protection function (S11).

If a user input is not detected for a preset time while an image is being played, the controller 170 may execute a screen protection function of removing the non-image area 59 except the image area 51. A method of removing the non-image area 59 is the same as that described in FIG. 5, and therefore, a duplicate description will be omitted.

The controller 170 may count the non-moving time of the image area (S13).

The non-moving time may mean a time when an image is displayed without moving in a specific area.

When moving the image area, the controller 170 may count the displayed time without moving in the moved area.

The controller 170 may calculate the remaining time based on the luminance and color change amount of the image (S15).

In the present invention, the retention time may mean a time when a user perceives a change in an image area to be minimized and is predicted to remain possible before an afterimage occurs in the corresponding image area.

The residence time may vary depending on the characteristics of the image, such as luminance and color change of the image. For example, the higher the luminance, the higher the probability of occurrence of an afterimage, so that the residual time can be calculated smaller. In particular, if the luminance is high, if there is a large change in the video image, even if the video area is moved quickly, the user may not be able to recognize the change in the video area.Therefore, the possibility of occurrence of afterimages can be lowered by calculating a smaller residual time. have.

Accordingly, the controller 170 may calculate the remaining time based on at least one of the luminance and color change amount of the image.

According to an embodiment of the present invention, the control unit 170 may calculate the remaining time based on the luminance and color change amount of the entire image.

According to another embodiment of the present invention, the control unit 170 may calculate the remaining time based on the amount of change in luminance and color of a specific region of an image. For example, the specific area may be a border area of an image. This will be described in detail with reference to FIG. 8.

8 is an exemplary diagram illustrating a specific area of an image for calculating a residual time by a display device according to an exemplary embodiment of the present invention.

The control unit 170 may calculate the remaining time based on the amount of change in luminance and color of a region of the image. For example, the control unit 170 may calculate the remaining time based on the luminance and color change amount of the edge area of the image area.

The border area may be an area adjacent to the non-image area 59 of the image area 51. That is, the border area may be an area located within a set distance d from the non-video area 59 of the image area 51.

According to an embodiment, the control unit 170 may adjust the set distance d according to the size of the entire screen provided by the display unit 180.

According to another embodiment, the controller 170 may adjust the set distance d based on a ratio of the size of the image area 51 to the size of the entire screen provided by the display unit 180.

The set distance (d) may be expressed as the number of pixels. For example, when the set distance (d) is 10 pixels, the border area refers to an area within 10 pixels in the center direction of the image area 51 from the boundary between the image area 51 and the non-image area 59 can do.

Referring to the example of FIG. 8, the border area is an area 51a within a distance of 10 pixels from a pixel located at the top of the image area 51, and within a distance of 10 pixels from a pixel corresponding to the leftmost of the image area 51. A region 51b that is present, a region 51c within a distance of 10 pixels from a pixel corresponding to the bottom of the image region 51, and a region 51d within a distance of 10 pixels from a pixel corresponding to the rightmost region of the image region 51 ) Can be included.

As described above, when calculating the residual time based on pixel data of the border area, the control unit 170 has an advantage of increasing the rate of calculating the residual time than when calculating the residual time based on pixel data of the entire image area. In particular, when the image area is moved, the change is prominent in the border area. Even if the residual time is calculated by analyzing only the pixel data of the border area, it is possible to minimize the case where the user perceives the change in the image area.

Next, a method of calculating the residual time based on the luminance and color change amount by the control unit 170 will be described.

9 is an exemplary diagram for explaining a method of calculating a residual time according to a luminance and a color change amount by a display device according to an exemplary embodiment of the present invention.

In particular, FIG. 9 may be an exemplary diagram of a graph in which a residence time is mapped according to a luminance and a color change amount.

The storage unit 140 may store a residual time mapping graph as illustrated in FIG. 9.

Referring to the example of FIG. 9, a first axis of the residual time mapping graph may indicate luminance, a second axis may indicate a color change amount, and a third axis may indicate a residence time. In this case, any one of the first axis, the second axis, and the third axis may be an x axis, the other may be a y axis, and the other may be a z axis.

Meanwhile, the storage unit 140 may store the remaining time mapping table, unlike FIG. 9. For example, the residual time mapping table may be a table in which one of a row and a column represents luminance, the other represents a color change amount, and a residual time is mapped to each of the rows and columns. .

In this way, the storage unit 140 may store data in which the residence time is mapped according to the luminance and color change amount in various forms.

The control unit 170 may obtain a luminance and color change amount of an image, and, based on data stored in the storage unit 140, obtain a residual time according to the luminance and color change amount of the image.

Meanwhile, the control unit 170 may obtain each of the luminance and color change amounts through the following equations.

[Equation 1]

(Luminance) = (Previous luminance) × a + (1-a) × (Current luminance)

[Equation 2]

(Color change amount) = (Previous color change amount) × a + (1-a) × (Current color change amount)

a is a constant, for example, a may be 0.1.

In addition, Equations 1 and 2 above are also merely exemplary. That is, the control unit 170 may calculate the luminance and color change amount in a method other than Equations 1 and 2 shown above.

In this way, after obtaining the luminance and color change amount of the image, the controller 170 may calculate the residual time based on the luminance and color change amount of the image.

The control unit 170 may calculate a shorter residence time as the luminance increases. For example, the control unit 170 may calculate the residence time when the luminance is the first luminance shorter than the residence time when the luminance is a second luminance lower than the first luminance.

In addition, the control unit 170 may calculate the residual time shorter as the color change amount increases. For example, when the color change amount is a first value, the control unit 170 may calculate the residence time shorter than the residence time when the color change amount is a second value smaller than the first value.

When the luminance is the same, the control unit 170 may calculate the remaining time differently according to the amount of color change. For example, if the luminance is the first luminance and the color change amount is the first value, and the remaining time is calculated as the first time, the control unit 170 is the first luminance, and the color change amount is less than the first value. If the value is 2, the residence time can be calculated as a second time longer than the first time.

Likewise, the control unit 170 may calculate the remaining time differently according to the luminance when the color change amount is the same. For example, when the color change amount is a first value, and when the luminance is the first luminance and the residual time is calculated as the first time, the color change amount is a first value, and the luminance is less than the first luminance. If it is the second luminance, the residence time can be calculated as a second time longer than the first time.

In this way, the control unit 170 may calculate the remaining time by considering both the brightness and the color change amount.

Again, Fig. 7 will be described.

The controller 170 may compare the non-moving time and the remaining time (S17).

When the non-moving time exceeds the remaining time, the controller 170 may move the image area (S19).

When the non-moving time exceeds the remaining time, the controller 170 determines that there is a high possibility that an afterimage may occur in the edge area of the image area, and may move the image area.

The moving direction of the image area may be similar to that described in FIG. 6. However, the moving direction illustrated in FIG. 6 is also merely an example, and the moving direction of the image area may be various.

If the non-moving time is less than the remaining time, the control unit 170 may compare the non-moving time and the critical time (S21).

Even when the non-moving time is less than the remaining time, the control unit 170 may move the image region as it is considered that the probability of occurrence of an afterimage is high when the image is displayed in the same region for too long.

That is, the controller 170 may set the maximum time of the non-moving time of the image area. The threshold time may be the maximum time of the non-moving time of the image area.

The threshold time may be equal to the maximum value of the calculated remaining time or greater than the maximum value of the calculated remaining time.

The threshold time may be a fixed time.

Alternatively, if the lifetime time of the pixels can be calculated, the controller 170 may adjust the threshold time based on the lifetime time of the pixels.

When the non-moving time exceeds the threshold time, the controller 170 may move the image area (S19).

That is, when the non-moving time is less than the remaining time and the non-moving time exceeds the threshold time, the controller 170 may move the image area.

However, if the non-moving time is less than or equal to the threshold time, the control unit 170 may continue to count the non-moving time and calculate the remaining time according to the luminance and color change amount of the image.

As described above, according to the third embodiment of the present invention, since the image region is moved according to the characteristics of the image without moving at a certain period, it is possible to quickly and frequently move the image region at a level in which the user is not aware of changes in the image. Therefore, there is an advantage of being able to more effectively improve the problem that the afterimage occurs.

Meanwhile, the control unit 170 may change the movement time of the image region according to the remaining time and adjust the movement amount of the image region according to the color change amount. For example, as the color change amount increases, the controller 170 may increase the movement amount of the image area.

In addition, the control unit 170 includes a video reproducing unit (not shown) for reproducing an image, an image characteristic calculating unit (not shown) for calculating the luminance and color change amount of a region of the image, and an image characteristic calculating unit (not shown). It may include an image moving unit (not shown) that determines whether to move the image through the calculation result and then determines the movement of the image.

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 will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (10)

A display unit that displays an image; And Including a control unit for moving the image region when the non-moving time of the image region in which the image is reproduced exceeds the remaining time Display device. The method of claim 1, The control unit Calculating the residual time based on the luminance and color change amount of the image Display device. The method of claim 2, The control unit The higher the luminance, the shorter the residence time is calculated. Display device. The method of claim 2, The control unit The larger the color change amount, the shorter the residence time is calculated. Display device. The method of claim 2, The control unit When the luminance is a first luminance and the color change amount is a first value, the remaining time is calculated as a first time, When the luminance is the first luminance and the color change amount is a second value smaller than the first value, the remaining time is calculated as a second time longer than the first time. Display device. The method of claim 2, The control unit When the luminance is a first luminance and the color change amount is a first value, the remaining time is calculated as a first time, When the luminance is a second luminance less than the first luminance, and the color change amount is the first value, the remaining time is calculated as a second time longer than the first time. Display device. The method of claim 1, The control unit If the non-moving time is less than the remaining time and the non-moving time exceeds a threshold time, moving the image area Display device. The method of claim 1, The control unit Calculating the residual time based on pixel data of an area within a set distance from a non-video area among the video areas Display device. The method of claim 1, The control unit When the video is being played and the screen protection function is running, the video region is moved by comparing the non-moving time and the remaining time. Display device. The method of claim 1, The control unit When the image is being played in a smaller size than the full screen, the image region is moved by comparing the non-moving time of the image and the remaining time. Display device.

Images