KR20240003966A - Image display apparatus - Google Patents

Abstract

This disclosure relates to a video display device. An image display device according to an embodiment of the present disclosure includes a display panel; A backlight unit including a plurality of blocks composed of light sources; and a control unit, wherein the control unit adjusts the overall luminance level according to a predetermined dimming frequency based on the fact that the overall luminance level corresponding to the image output through a predetermined area of the display panel corresponds to a preset main luminance level. Outputting a first signal corresponding to , outputting a second signal corresponding to the luminance level for each block of the plurality of blocks corresponding to the predetermined area to the backlight unit, the luminance level for each block corresponds to the main luminance level, and the backlight unit, Based on the second signal, while light corresponding to the first luminance level is emitted through the first block in a first section among a plurality of sections included in a predetermined period corresponding to the predetermined dimming frequency, the first Operates to emit light corresponding to a second luminance level through a plurality of second blocks arranged adjacently to surround a block, and in a second section of the plurality of sections, the second luminance level is emitted through the first block. While light corresponding to is emitted, light corresponding to the first luminance level may be emitted through the plurality of second blocks. Various other embodiments are possible.

Description

Image display device {IMAGE DISPLAY APPARATUS}

This disclosure relates to a video display device.

A video display device is a device that has the function of displaying images that users can view. For example, representative image display devices include liquid crystal displays (LCD) using liquid crystals and OLED displays using organic light emitting diodes (OLED).

Among them, the liquid crystal display device includes a liquid crystal layer and displays an image by controlling the electric field applied to the liquid crystal layer to modulate light emitted from a light source of a backlight unit. Recently, a local dimming method using multiple light sources is used to reduce the power consumption of the backlight unit and improve the contrast ratio and clarity of the image. The local dimming method refers to a method of locally controlling the luminance of each screen area by dividing the light sources of the backlight unit into screen areas and adjusting the brightness of the light sources of the backlight unit for each screen area.

When a signal for adjusting the brightness of the screen area is input to the backlight unit, the backlight unit can adjust the intensity of light emitted from the light source based on data about the brightness included in the signal. At this time, as the size of the data on luminance included in the signal input to the backlight unit increases, the luminance of the screen area can be adjusted in various ways. For example, if the data size for luminance is 8 bits, the intensity of light can be adjusted according to 256 luminance levels, and if the data size for luminance is 10 bits, the intensity of light can be adjusted according to 1024 luminance levels. Meanwhile, as the size of luminance data that can be transmitted to the backlight unit increases, high performance is required for components used for luminance control, which leads to an increase in manufacturing costs.

The present disclosure aims to solve the above-described problems and other problems.

Another purpose is to provide an image display device that can adjust the brightness of the screen area in various ways, despite limitations on the size of data used for brightness adjustment.

Another purpose is to provide an image display device that can output light so that the luminance of the screen area is constant throughout the screen area.

To achieve the above object, an image display device according to an embodiment of the present disclosure includes a display panel; A backlight unit including a plurality of blocks composed of light sources; and a control unit, wherein the control unit adjusts the overall luminance level according to a predetermined dimming frequency based on the fact that the overall luminance level corresponding to the image output through a predetermined area of the display panel corresponds to a preset main luminance level. Outputting a first signal corresponding to , outputting a second signal corresponding to the luminance level for each block of the plurality of blocks corresponding to the predetermined area to the backlight unit, the luminance level for each block corresponds to the main luminance level, and the backlight unit, Based on the second signal, while light corresponding to the first luminance level is emitted through the first block in a first section among a plurality of sections included in a predetermined period corresponding to the predetermined dimming frequency, the first Operates to emit light corresponding to a second luminance level through a plurality of second blocks arranged adjacently to surround a block, and in a second section of the plurality of sections, the second luminance level is emitted through the first block. While light corresponding to is emitted, light corresponding to the first luminance level may be emitted through the plurality of second blocks.

The effects of the video display device according to the present disclosure will be described as follows.

According to at least one embodiment of the present disclosure, despite limitations on the size of data used for brightness adjustment, the brightness of the screen area can be adjusted in various ways.

According to at least one embodiment of the present disclosure, light may be output so that the luminance of the screen area is constant throughout the screen area.

Additional scope of applicability of the present disclosure will become apparent from the detailed description that follows. However, since various changes and modifications within the spirit and scope of the present disclosure may be clearly understood by those skilled in the art, the detailed description and specific embodiments such as preferred embodiments of the present disclosure should be understood as being given only as examples.

1 is a diagram illustrating an image display system according to various embodiments of the present disclosure.
FIG. 2 is an internal block diagram of the video display device of FIG. 1.
FIG. 3 is a diagram referenced in the description of the control unit of FIG. 2.
FIG. 4 is a diagram illustrating a control method of the remote control device of FIG. 2.
Figures 5 to 7 are drawings referenced in the description of the display of Figure 2.
Figure 8 is a flowchart of a method of operating an image display device according to an embodiment of the present disclosure.
9 to 12 are diagrams referenced in the description of the operating method of the image display device of FIG. 8.
Figure 13 is a flowchart of a method of operating an image display device according to an embodiment of the present disclosure.
FIG. 14 is a diagram referenced in the description of the operation method of the image display device of FIG. 13.

Hereinafter, the present disclosure will be described in detail with reference to the drawings. In the drawings, parts not related to the description are omitted in order to clearly and briefly explain the present disclosure, and identical or extremely similar parts are denoted by the same drawing reference numerals throughout the specification.

The suffixes “module” and “part” for components used in the following description are simply given in consideration of the ease of writing this specification, and do not in themselves give any particularly important meaning or role. Accordingly, the terms “module” and “unit” may be used interchangeably.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Additionally, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

1 is a diagram illustrating an image display system according to various embodiments of the present disclosure.

1 Referring to Figure 1, the image display system 10 may include an image display device 100 and/or a remote control device 200.

The image display device 100 may be a device that processes and outputs images. The video display device 100 is not particularly limited as long as it can output a screen corresponding to a video signal, such as a TV, laptop computer, or monitor.

The video display device 100 can receive a broadcast signal, process it, and output a processed broadcast image. When the video display device 100 receives a broadcast signal, the video display device 100 may correspond to a broadcast reception device.

The video display device 100 may receive broadcast signals wirelessly through an antenna, or may receive broadcast signals wired through a cable.

For example, the image display device 100 can receive terrestrial broadcasting signals, satellite broadcasting signals, cable broadcasting signals, and Internet Protocol Television (IPTV) broadcasting signals.

The remote control device 200 can be connected to the video display device 100 by wire and/or wirelessly and provide various control signals to the video display device 100. At this time, the remote control device 200 establishes a wired or wireless network with the video display device 100 and transmits various control signals to the video display device 100 or the video display device 100 through the established network. It may include a device that receives signals related to various operations processed in the image display device 100 from.

For example, various input devices such as a mouse, keyboard, spatial remote control, trackball, and joystick may be used as the remote control device 200. The remote control device 200 may be referred to as an external device, and hereinafter, it will be specified in advance that the external device and the remote control device may be used interchangeably as needed.

The video display device 100 may be connected to only a single remote control device 200 or simultaneously connected to two or more remote control devices 200, and displays the image on the screen based on the control signal provided from each remote control device 200. You can change the displayed object or adjust the screen state.

FIG. 2 is an internal block diagram of the video display device of FIG. 1.

Referring to FIG. 2, the video display device 100 includes a broadcast receiver 105, an external device interface unit 130, a network interface unit 135, a storage unit 140, a user input interface unit 150, and an input unit. It may include 160, a control unit 170, a display 180, an audio output unit 185, and/or a power supply unit 190.

The broadcast reception unit 105 may include a tuner unit 110 and a demodulation unit 120.

Meanwhile, unlike the drawing, the video display device 100 includes a broadcast receiver 105, an external device interface unit 130, and a network interface unit 135. It is also possible to include only That is, the image display device 100 may not include the network interface unit 135.

The tuner unit 110 may select a broadcast signal corresponding to a channel selected by the user or all previously stored channels among broadcast signals received through an antenna (not shown) or a cable (not shown). The tuner unit 110 can convert the selected broadcast signal into an intermediate frequency signal or a baseband video or audio signal.

For example, if the selected broadcast signal is a digital broadcast signal, the tuner unit 110 may convert it into a digital IF signal (DIF), and if the selected broadcast signal is an analog broadcast signal, it may be converted into an analog baseband video or audio signal (CVBS/SIF). . That is, the tuner unit 110 can process digital broadcasting signals or analog broadcasting signals. The analog base band video or audio signal (CVBS/SIF) output from the tuner unit 110 may be directly input to the control unit 170.

Meanwhile, the tuner unit 110 may sequentially select broadcast signals of all broadcast channels stored through a channel memory function among received broadcast signals and convert them into intermediate frequency signals or baseband video or audio signals.

Meanwhile, the tuner unit 110 may be equipped with multiple tuners in order to receive broadcast signals of multiple channels. Alternatively, a single tuner that simultaneously receives broadcast signals from multiple channels is also possible.

The demodulator 120 may receive the digital IF signal (DIF) converted by the tuner unit 110 and perform a demodulation operation.

The demodulator 120 may output a stream signal TS after performing demodulation and channel decoding. At this time, the stream signal may be a multiplexed video signal, audio signal, or data signal.

The stream signal output from the demodulator 120 may be input to the control unit 170. After performing demultiplexing and video/audio signal processing, the control unit 170 can output video through the display 180 and audio through the audio output unit 185.

The external device interface unit 130 can transmit or receive data with a connected external device. To this end, the external device interface unit 130 may include an A/V input/output unit (not shown).

The external device interface unit 130 can be connected wired/wireless to external devices such as DVD (Digital Versatile Disk), Blu ray, game device, camera, camcorder, computer (laptop), set-top box, etc. , input/output operations can also be performed with external devices.

In addition, the external device interface unit 130 establishes a communication network with various remote control devices 200 as shown in FIG. 1, and provides control related to the operation of the image display device 100 from the remote control device 200. A signal may be received, or data related to the operation of the image display device 100 may be transmitted to the remote control device 200.

The A/V input/output unit can receive video and audio signals from an external device. For example, the A/V input/output unit includes an Ethernet terminal, USB terminal, CVBS (Composite Video Banking Sync) terminal, component terminal, S-video terminal (analog), DVI (Digital Visual Interface) terminal, and HDMI (High Definition Multimedia Interface) terminal, MHL (Mobile High-definition Link) terminal, RGB terminal, D-SUB terminal, IEEE 1394 terminal, SPDIF terminal, Liquid HD terminal, etc. Digital signals input through these terminals may be transmitted to the control unit 170. At this time, the analog signal input through the CVBS terminal and the S-video terminal may be converted into a digital signal through an analog-to-digital converter (not shown) and transmitted to the control unit 170.

The external device interface unit 130 may include a wireless communication unit (not shown) for short-distance wireless communication with other electronic devices. Through this wireless communication unit, the external device interface unit 130 can exchange data with an adjacent mobile terminal. For example, the external device interface unit 130 may receive device information, executing application information, application images, etc. from the mobile terminal in mirroring mode.

The external device interface unit 130 performs short-range wireless communication using Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra-Wideband (UWB), ZigBee, etc. It can be done.

The network interface unit 135 may provide an interface for connecting the video display device 100 to a wired/wireless network including an Internet network.

The network interface unit 135 may include a communication module (not shown) for connection to a wired/wireless network. For example, the network interface unit 135 provides communications for wireless LAN (WLAN) (Wi-Fi), wireless broadband (Wibro), World Interoperability for Microwave Access (Wimax), and High Speed Downlink Packet Access (HSDPA). Can contain modules.

The network interface unit 135 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 135 may receive web content or data provided by a content provider or network operator. That is, the network interface unit 135 can receive content such as movies, advertisements, games, VOD, broadcasting, etc. and information related thereto provided from a content provider or network provider through a network.

The network interface unit 135 can receive firmware update information and update files provided by a network operator, and can transmit data to the Internet, a content provider, or a network operator.

The network interface unit 135 can select and receive a desired application from among applications open to the public through a network.

The storage unit 140 may store programs for processing and controlling each signal in the control unit 170, or may store processed video, audio, or data signals. For example, the storage unit 140 stores application programs designed for the purpose of performing various tasks that can be processed by the control unit 170, and selects some of the stored application programs at the request of the control unit 170. can be provided.

Programs stored in the storage unit 140 are not particularly limited as long as they can be executed by the control unit 170.

The storage unit 140 may perform a function for temporarily storing video, voice, or data signals received from an external device through the external device interface unit 130.

The storage unit 140 can store information about a certain broadcast channel through a channel memory function such as a channel map.

Although FIG. 2 shows an embodiment in which the storage unit 140 is provided separately from the control unit 170, the scope of the present disclosure is not limited thereto, and the storage unit 140 may be included in the control unit 170.

The storage unit 140 includes volatile memory (e.g., DRAM, SRAM, SDRAM, etc.), non-volatile memory (e.g., flash memory, hard disk drive (HDD), and solid state drive (Solid). -state drive; SSD), etc.) may be included. In various embodiments of the present disclosure, the storage unit 140 and memory may be used interchangeably.

The user input interface unit 150 may transmit a signal input by the user to the control unit 170 or transmit a signal from the control unit 170 to the user.

For example, transmitting/receiving user input signals such as power on/off, channel selection, and screen settings from the remote control device 200, or local keys such as power key, channel key, volume key, and setting value (not shown). The user input signal input from the control unit 170 is transmitted to the control unit 170, the user input signal input from the sensor unit (not shown) that senses the user's gesture is transmitted to the control unit 170, or the signal from the control unit 170 is transmitted to the control unit 170. It can be transmitted to the sensor unit.

The input unit 160 may be provided on one side of the main body of the image display device 100. For example, the input unit 160 may include a touch pad, physical buttons, etc.

The input unit 160 can receive various user commands related to the operation of the image display device 100 and transmit control signals corresponding to the input commands to the control unit 170.

The input unit 160 may include at least one microphone (not shown) and may receive the user's voice through the microphone.

The control unit 170 may include at least one processor, and may control the overall operation of the image display device 100 using the processor included therein. Here, the processor may be a general processor such as a central processing unit (CPU). Of course, the processor may be a dedicated device such as an ASIC or another hardware-based processor.

The control unit 170 demultiplexes the stream input through the tuner unit 110, demodulator 120, external device interface unit 130, or network interface unit 135, or processes the demultiplexed signals. , signals for video or audio output can be generated and output.

The display 180 converts the video signal, data signal, OSD signal, and control signal processed by the control unit 170 or the video signal, data signal, and control signal received from the external device interface unit 130 to provide a driving signal. can be created.

The display 180 may include a display panel (not shown) having a plurality of pixels.

A plurality of pixels provided in the display panel may include RGB subpixels. Alternatively, a plurality of pixels provided in the display panel may include RGBW subpixels. The display 180 may convert image signals, data signals, OSD signals, control signals, etc. processed by the control unit 170 to generate driving signals for a plurality of pixels.

The display 180 may be a plasma display panel (PDP), liquid crystal display (LCD), organic light emitting diode (OLED), or flexible display, and may also be capable of a 3D display. there is. The 3D display 180 can be divided into a glasses-free type and a glasses type.

Meanwhile, the display 180 can be configured as a touch screen and used as an input device in addition to an output device.

The audio output unit 185 receives the audio-processed signal from the control unit 170 and outputs it as audio.

The video signal processed by the control unit 170 may be input to the display 180 and displayed as an image corresponding to the video signal. Additionally, the image signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

The voice signal processed by the control unit 170 may be output as sound to the audio output unit 185. Additionally, the voice signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

Although not shown in FIG. 2, the control unit 170 may include a demultiplexer, an image processor, etc. This will be described later with reference to FIG. 3.

In addition, the control unit 170 can control overall operations within the image display device 100. For example, the control unit 170 may control the tuner unit 110 to select (tuning) a broadcast corresponding to a channel selected by the user or a previously stored channel.

Additionally, the control unit 170 may control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Meanwhile, the control unit 170 can control the display 180 to display an image. At this time, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

Meanwhile, the control unit 170 can cause a certain 2D object to be displayed in the image displayed on the display 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

Meanwhile, the image display device 100 may further include a photographing unit (not shown). The photographing unit may photograph the user. The photographing unit can be implemented with one camera, but is not limited to this, and can also be implemented with a plurality of cameras. Meanwhile, the photographing unit may be embedded in the image display device 100 on the upper part of the display 180 or may be placed separately. Image information captured by the photographing unit may be input to the control unit 170.

The control unit 170 may recognize the user's location based on the image captured by the photographing unit. For example, the control unit 170 may determine the distance (z-axis coordinate) between the user and the image display device 100. In addition, the control unit 170 may determine the x-axis coordinate and y-axis coordinate in the display 180 corresponding to the user's location.

The control unit 170 may detect a user's gesture based on each or a combination of an image captured by a photographing unit or a sensed signal from a sensor unit.

The power supply unit 190 can supply the corresponding power throughout the image display device 100. In particular, power can be supplied to the control unit 170, which can be implemented in the form of a system on chip (SOC), the display 180 for displaying images, and the audio output unit 185 for audio output. there is.

Specifically, the power supply unit 190 may include a converter (not shown) that converts AC power to DC power and a Dc/Dc converter (not shown) that converts the level of DC power.

The remote control device 200 may transmit user input to the user input interface unit 150. For this purpose, the remote control device 200 may use Bluetooth, Radio Frequency (RF) communication, Infrared Radiation communication, Ultra-wideband (UWB), ZigBee, etc. Additionally, the remote control device 200 may receive video, audio, or data signals output from the user input interface unit 150, and display them or output audio signals on the remote control device 200.

Meanwhile, the above-described video display device 100 may be a fixed or mobile digital broadcasting receiver capable of receiving digital broadcasting.

Meanwhile, the block diagram of the image display device 100 shown in FIG. 2 is only a block diagram for one embodiment of the present disclosure, and each component of the block diagram is according to the specifications of the image display device 100 that is actually implemented. May be combined, added, or omitted.

That is, as needed, two or more components may be combined into one component, or one component may be subdivided into two or more components. In addition, the functions performed in each block are for explaining embodiments of the present disclosure, and the specific operations or devices do not limit the scope of the present disclosure.

FIG. 3 is an internal block diagram of the control unit of FIG. 2.

Referring to FIG. 3, the control unit 170 according to an embodiment of the present disclosure includes a demultiplexer 310, an image processor 320, a processor 330, an OSD generator 340, a mixer 345, It may include a frame rate converter 350 and/or a formatter 360. In addition, it may further include an audio processing unit (not shown) and a data processing unit (not shown).

The demultiplexer 310 can demultiplex the input stream. For example, when MPEG-2 TS is input, it can be demultiplexed and separated into video, voice, and data signals. Here, the stream signal input to the demultiplexer 310 may be a stream signal output from the tuner unit 110, demodulator 120, or external device interface unit 130.

The image processing unit 320 may perform image processing of demultiplexed video signals. For this purpose, the image processing unit 320 may include an image decoder 325 and a scaler 335.

The video decoder 325 can decode the demultiplexed video signal, and the scaler 335 can perform scaling so that the resolution of the decoded video signal can be output on the display 180.

The video decoder 325 may be equipped with decoders of various standards. For example, it may be equipped with an MPEG-2, H,264 decoder, a 3D image decoder for color image and depth image, and a decoder for multiple viewpoint images.

The processor 330 may control overall operations within the image display device 100 or the control unit 170. For example, the processor 330 may control the tuner 110 to select (tuning) a broadcast corresponding to a channel selected by the user or a pre-stored channel.

In addition, the processor 330 can control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Additionally, the processor 330 may perform data transmission control with the network interface unit 135 or the external device interface unit 130.

Additionally, the processor 330 may control the operations of the demultiplexer 310, the image processor 320, and the OSD generator 340 within the control unit 170.

The OSD generator 340 may generate an OSD signal according to user input or on its own. For example, based on a user input signal input through the input unit 160, a signal for displaying various information in graphics or text can be generated on the screen of the display 180.

The generated OSD signal may include various data such as a user interface screen of the video display device 100, various menu screens, widgets, and icons. Additionally, the generated OSD signal may include 2D objects or 3D objects.

Additionally, the OSD generator 340 may generate a pointer that can be displayed on the display 180 based on the pointing signal input from the remote control device 200.

The OSD generator 340 may include a pointing signal processor (not shown) that generates a pointer. It is also possible for the pointing signal processing unit (not shown) to be provided separately rather than within the OSD generating unit 340.

The mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded image signal processed by the image processor 320. The mixed video signal may be provided to the frame rate converter 350.

The frame rate converter (FRC) 350 can convert the frame rate of the input video. Meanwhile, the frame rate conversion unit 350 is also capable of outputting the image as is without separate frame rate conversion.

The formatter 360 can arrange the left eye image frames and right eye image frames of the frame rate converted 3D image. Additionally, a synchronization signal (Vsync) for opening the left eye glass and the right eye glass of the 3D viewing device (not shown) may be output.

Meanwhile, the formatter 360 can change the format of the input video signal into an video signal for display on the display 180 and output it.

Additionally, the formatter 360 can change the format of the 3D video signal. For example, among various 3D formats such as Side by Side format, Top/Down format, Frame Sequential format, Interlaced format, and Checker Box format. It can be changed to any one format.

Meanwhile, the formatter 360 may convert a 2D video signal into a 3D video signal. For example, according to a 3D image generation algorithm, edges or selectable objects can be detected within a 2D image signal, and objects or selectable objects according to the detected edges can be separated into 3D image signals to be generated. You can. At this time, the generated 3D image signal may be separated and arranged into the left eye image signal (L) and the right eye image signal (R), as described above.

Meanwhile, although not shown in the drawing, it is possible that a 3D processor (not shown) for 3-dimensional effect signal processing is further disposed after the formatter 360. These 3D processors can process brightness, tint, and color adjustments of video signals to improve 3D effects. For example, signal processing can be performed to make near areas clear and far areas blurry. Meanwhile, the functions of this 3D processor may be merged into the formatter 360 or within the image processing unit 320.

Meanwhile, the audio processing unit (not shown) in the control unit 170 may perform audio processing of the demultiplexed audio signal. For this purpose, the audio processing unit (not shown) may be equipped with various decoders.

Additionally, the audio processing unit (not shown) within the control unit 170 can process bass, treble, and volume control.

The data processing unit (not shown) within the control unit 170 may perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is an encoded data signal, it can be decoded. The encoded data signal may be electronic program guide information including broadcast information such as the start time and end time of the broadcast program aired on each channel.

Meanwhile, the block diagram of the control unit 170 shown in FIG. 3 is only a block diagram for one embodiment of the present disclosure, and each component of the block diagram can be integrated, added, or integrated according to the specifications of the control unit 170 that is actually implemented. Or it may be omitted.

In particular, the frame rate converter 350 and the formatter 360 may not be provided within the control unit 170, but may be provided separately or as a single module.

FIG. 4 is a diagram illustrating a control method of the remote control device of FIG. 2.

Referring to FIG. 4, it can be seen that a pointer 205 corresponding to the remote control device 200 is displayed on the display 180 of the image display device 100.

Referring to (a) of FIG. 4, the user can move or rotate the remote control device 200 up and down, left and right, back and forth. At this time, the pointer 205 displayed on the display 180 of the image display device 100 may be displayed in response to the movement of the remote control device 200. As shown in the drawing, this remote control device 200 can be called a spatial remote control or a 3D pointing device because the corresponding pointer 205 is moved and displayed according to movement in 3D space.

Referring to (b) of FIG. 4, when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display 180 of the video display device 100 also moves to the left. You can see that it moves to the left in response to the movement.

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

Referring to (c) of FIG. 4, while pressing a specific button provided on the remote control device 200, the user can move the remote control device 200 away from the display 180. As a result, the selected area in the display 180 corresponding to the pointer 205 can be zoomed in and displayed enlarged. On the contrary, when the user moves the remote control device 200 closer to the display 180 while pressing a specific button provided on the remote control device 200, the display 180 corresponding to the pointer 205 The selected area within may be zoomed out and displayed in a reduced size.

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

Meanwhile, when the user presses a specific button in the remote control device 200, recognition of up-down and left-right movement may be excluded. That is, when the remote control device 200 moves away from or approaches the display 180, up, down, left, and right movements are not recognized, and only forward and backward movements can be recognized. When the user does not press a specific button in the remote control device 200, only up, down, left, and right movements of the remote control device 200 can be recognized, and only the pointer 205 can be moved accordingly.

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

FIGS. 5 and 6 are drawings referenced in the description of the display of FIG. 2.

Referring to FIG. 5 , the display 180 may include a display panel 210, a panel driver 230, and/or a backlight unit 250.

The display panel 210 may include a plurality of pixels (P). A plurality of pixels P may be connected to a plurality of gate lines GL and data lines DL arranged to cross each other in a matrix form. A plurality of thin film transistors (TFTs) may be disposed at intersections of the plurality of gate lines GL and the data lines DL. A plurality of pixels P may be formed at intersections of the plurality of data lines DL and the plurality of gate lines GL. Each of the plurality of pixels P may be connected to a data line and a gate line.

If the image display device 100 is a liquid crystal display device (LCD), the plurality of pixels may include a liquid crystal layer, and if the image display device 100 is an OLED display device, the plurality of pixels may include an organic light emitting diode (OLED). ) may include.

The display panel 210 is formed between a first substrate on which a driving element such as a thin film transistor (TFT) and a pixel electrode connected thereto are formed, a second substrate on which a common electrode is provided, and between the first substrate and the second substrate. It may include a liquid crystal layer.

The panel driver 230 may drive the display panel 210 based on control signals and data signals transmitted from the control unit 170. The panel driver 230 may include a timing control unit 232, a gate driver 234, and/or a data driver 236.

The timing control unit 232 may receive control signals, video signals, etc. from the control unit 170. For example, the timing control unit 232 may receive an RGB signal, a vertical synchronization signal (Vsync), etc. from the control unit 170. The timing control unit 232 may control the gate driver 234 and/or the data driver 236 in response to the control signal. The timing control unit 232 may rearrange the image signal according to the specifications of the data driver 236 and transmit it to the data driver 236.

The timing control unit 232 may be included in the control unit 170. The timing control unit 232 may be implemented as a separate component from the control unit 170.

The gate driver 234 and data driver 236 can supply scan signals and image signals to the display panel 210 through the gate line GL and data line DL under the control of the timing controller 232. there is.

Meanwhile, the data driver 236 may include a plurality of source driver integrated circuits (ICs) (not shown) corresponding to a plurality of data lines DL.

The backlight unit 250 may supply light to the display panel 210 . To this end, the backlight unit 250 includes at least one light source 252 that outputs light, a scan driver 254 that controls the scanning drive of the light source 252, and/or turns on/off the light source 252. It may include a light source driver 256 that turns off.

The display 180 displays a predetermined image using light emitted from the backlight unit 250 in a state in which the light transmittance of the liquid crystal layer is adjusted by the electric field formed between the pixel electrode and the common electrode of the display panel 210. It can be displayed.

The power supply unit 190 may supply a common electrode voltage (Vcom) to the display panel 210 and a gamma voltage to the data driver 236. Additionally, driving power for driving the light source 252 can be supplied to the backlight unit 250.

According to one embodiment, the display 180 may be driven using a local dimming method. The backlight unit 250 may be divided into a plurality of blocks. The backlight unit 250 may be driven for each divided block. For example, when the backlight unit 250 is driven by a local dimming method, the display panel 210 may have a plurality of divided areas corresponding to each block of the backlight unit 250. At this time, the brightness of light emitted from each block of the backlight unit 250 may be adjusted according to the luminance level of each of the divided areas of the display panel 210, for example, the peak value of the gray level or the color coordinate signal. That is, the image display device 100 reduces the brightness of the light emitted from the block corresponding to the dark part of the image among the blocks of the backlight unit 250, and reduces the brightness of the light emitted from the block corresponding to the bright part of the image. can increase. Through this, the contrast ratio and clarity of the image output through the image display device 100 can be improved.

The image display device 100 may set a dimming value for each block of the backlight unit 250 so that the display 180 performs local dimming. Here, the dimming value of a specific block may correspond to the luminance level of a specific divided area corresponding to the specific block. For example, the control unit 170 may calculate the luminance level corresponding to the image based on the RGB signal. At this time, the control unit 170 may determine the dimming value corresponding to the determined luminance level as the dimming value of the block corresponding to the area where the image is output.

The image display device 100 may determine a frequency (hereinafter referred to as a dimming frequency) corresponding to a period in which the driving of the light source 252 is adjusted according to the driving signal. For example, when the dimming frequency is 60Hz, the operation of the light source 252 can be adjusted 60 times for 1 second. The image display device 100 may determine the dimming frequency based on the frame rate and refresh rate of the image. According to one embodiment, the dimming frequency may be n times the frame rate (n is an integer of 1 or more). For example, the n value may be preset to 1. At this time, the image display device 100 can change the dimming frequency by changing the n value.

The control unit 170 may determine the luminance level for the entire area and/or a partial area of the image based on the RGB signal. For example, the control unit 170 determines the average luminance level (Average Picture Level, APL) of each of the plurality of divided areas corresponding to each block of the backlight unit 250, the average luminance level of the entire area of the image, etc. can do.

The controller 170 may calculate a dimming value for each block of the backlight unit 250 based on the luminance level for the entire area and/or a partial area of the image. For example, the control unit 170 may calculate a dimming value for each block of the backlight unit 250 based on the luminance level of each of the plurality of divided areas, the luminance level of the surrounding area, the luminance level of the entire area, etc. there is. At this time, the control unit 170 reduces the brightness of light emitted from blocks in an area with a low luminance level among the blocks of the backlight unit 250, and increases the brightness of light emitted from blocks in an area with a high luminance level, Dimming value can be calculated.

The control unit 170 may output the calculated dimming value to the backlight unit 250. The control unit 170 may output a signal including the calculated dimming value to the backlight unit 250. The backlight unit 250 may adjust the intensity of light emitted from the light source 252 based on the dimming value received from the control unit 170.

Referring to FIG. 6, the backlight unit 250 according to an embodiment of the present disclosure may be implemented as a direct type.

The display panel 210 may be composed of a plurality of divided areas. In FIG. 6 , the display panel 210 is equally divided into 16 division areas BL1 to BL16, but the present invention is not limited thereto. Each of the plurality of divided areas BL1 to BL16 may include a plurality of pixels.

The backlight unit 250 may have a structure in which a plurality of optical sheets and a diffusion plate are stacked below the display panel 210, and a plurality of light sources are arranged below the diffusion plate.

Blocks B1 to B16 of the backlight unit 250 may respectively correspond to divided areas BL1 to BL16 of the display panel 210. For example, the first block B1 of the backlight unit 250 may correspond to the first divided area BL1 of the display panel 210. At this time, the brightness of the light incident on the first divided area BL1 of the display panel 210 is the first divided area BL1 of the backlight unit 250 disposed at a position corresponding to the first divided area BL1 of the display panel 210. It can be adjusted by the light source 252 included in block B1.

The light source 252 provided in the blocks B1 to B16 of the backlight unit 250 may be implemented as point light sources such as light emitting diodes (LEDs).

The light source 252 may be turned on or off depending on the driving signal received from the light source driver 256. The light source driver 256 may generate a driving signal based on the dimming value output from the controller 170. The driving signal may be a pulse width modulation (PWM) signal. For example, the brightness of the light emitted from the light source 252 may be adjusted according to the amplitude of the driving signal received from the light source driver 256. For example, the brightness of light from the light source 252 may be adjusted according to the pulse width of the driving signal received from the light source driver 256.

Meanwhile, in the present disclosure, the backlight unit 250 is described as being implemented as a direct type, but is not limited thereto. For example, the backlight unit 250 may be implemented as an edge type. For example, the edge-type backlight unit 250 may be implemented in a structure in which a plurality of optical sheets and a light guide plate are stacked under the display panel 210 and a plurality of light sources 252 are disposed on the side of the light guide plate.

Referring to FIG. 7 , the backlight unit 250 may include a plurality of driving units 250a to 250n.

The plurality of driving units 250a to 250n may receive signals from the control unit 170. The signal received from the control unit 170 may include a dimming value calculated for a plurality of blocks, a vertical synchronization signal (Vsync) corresponding to one frame, etc. The plurality of driving units 250a to 250n may receive signals using SPI (Serial Peripheral Interface) communication. For example, the plurality of driving units 250a to 250n may receive signals from the control unit 170 through cables 710 to 760 corresponding to the plurality of driving units 250a to 250n.

The plurality of driving units 250a to 250n may include light source drivers 256a to 256n and/or a plurality of light sources 252a to 252n.

The light source drivers 256a to 256n may each include at least one driver IC. Each of the plurality of driver ICs may output a driving signal for controlling the brightness of n blocks using n channels. Each of the plurality of driver ICs may output a driving signal that adjusts the brightness of the light source 252 based on the dimming values calculated for the plurality of blocks. For example, when each driver IC outputs a driving signal using 16 channels, each driver IC can adjust the brightness of the light source 252 included in 16 blocks. At this time, when the first light source driver 256a includes four driver ICs, the first light source driver 256a is a light source included in 4Х16, or 64, blocks among the divided blocks of the backlight unit 250. The brightness of (252) can be adjusted.

Each of the plurality of driving units 250a to 250n may include a substrate. For example, the substrate may be a printed circuit board (PCB). Components included in the plurality of driving units 250a to 250n, for example, driver ICs, may be respectively mounted on a plurality of substrates corresponding to the plurality of driving units 250a to 250n. Substrates corresponding to the plurality of driving units 250a to 250n may be arranged adjacent to each other according to the order of divided blocks of the backlight unit 250.

Meanwhile, the plurality of driving units 250a to 250n may further include a digital analog converter (DAC). For example, if the dimming value output from the control unit 170 is a digital signal, a digital-to-analog converter (DAC) may convert the digital dimming value into analog and output it to the driver IC.

Figure 8 is a flowchart of a method of operating an image display device according to an embodiment of the present disclosure.

Referring to FIG. 8 , the image display device 100 may determine a luminance level (hereinafter, overall luminance level) corresponding to an image output through a predetermined area of the display panel 210 in operation S810. Here, the overall luminance level may correspond to the average luminance level (APL) of an image output through a certain area, but is not limited thereto. For example, the overall luminance level may correspond to at least one of an average pixel value, an average luminance level (APL), a maximum pixel value, a minimum pixel value, and an intermediate pixel value.

The video display device 100 may determine whether the overall luminance level corresponds to the preset main luminance level in operation S820. Here, the main luminance level may be a luminance level corresponding to a dimming value that can be output by the control unit 170 based on the size of data used for luminance adjustment. For example, if the size of data representing the dimming value is 8 bits, the number of luminance levels preset as the main luminance level may be 256. In the present disclosure, the main luminance level is described as an integer of 1 or more, but is not limited thereto.

In operation S830, the video display device 100 may determine the dimming frequency according to frequency multiplication based on the fact that the overall luminance level does not correspond to the preset main luminance level. For example, based on the frame rate being 120Hz, the dimming frequency (hereinafter, reference dimming frequency) preset to the video display device 100 may be preset to 120Hz. At this time, when the overall luminance level corresponds to the preset main luminance level, the video display device 100 may determine the dimming frequency to be 120Hz, which is preset as the reference dimming frequency. Meanwhile, when the overall luminance level does not correspond to the preset main luminance level, the video display device 100 may determine the dimming frequency to be a multiple of 120 Hz, which is preset as the reference dimming frequency.

According to one embodiment, an integer (hereinafter referred to as a multiplier) corresponding to a multiple of the reference dimming frequency determined according to frequency multiplication may be determined according to the overall luminance level. For example, if the overall luminance level is one-half of the specific luminance level corresponding to the main luminance level, the multiplier may be determined to be 2 and the dimming frequency may be determined to be 240 Hz.

According to one embodiment, the multiplier determined according to the frequency multiplication may be determined according to a preset reference dimming frequency. For example, if the standard dimming frequency is 30Hz and the dimming frequency determined according to the multiple is 60Hz, the user may perceive flicker by the change in the intensity of light output through the block every 1/60 second corresponding to 60Hz. can do. Considering this, the image display device 100 may determine a multiple such that the dimming frequency exceeds the maximum frequency at which a user perceives flicker (eg, 60 Hz).

According to one embodiment, the multiplier determined according to the frequency multiplication may be determined according to the maximum performance of the image display device 100. For example, if the dimming frequency corresponding to the maximum performance of the video display device 100 is 480 Hz, the dimming frequency determined according to the multiplier may be 480 Hz or less.

The image display device 100 may determine the luminance level for each block corresponding to a plurality of sections for a plurality of blocks corresponding to a predetermined area of the display panel 210 in operation S840. Here, the plurality of sections may correspond to a time divided by a multiple of a predetermined period corresponding to the reference dimming frequency. For example, if the reference dimming frequency is 120 Hz and the multiplier is 2, the number of multiple sections may be 2, and the time corresponding to each of the multiple sections may be 1/240 second. At this time, the image display device 100 may determine the luminance level for each block corresponding to the first section among the plurality of sections and the luminance level for each block corresponding to the second section, respectively.

According to one embodiment, the luminance level for each block corresponding to a plurality of sections may correspond to the main luminance level. For example, if the number of luminance levels preset as the main luminance level is 256, the luminance level for each block may be determined to be one of the 256 luminance levels.

According to one embodiment, the luminance level for each block corresponding to a plurality of sections may be determined based on the arrangement of the plurality of blocks. When the luminance level determined for the first block among the plurality of blocks is the first luminance level in the first section and the second luminance level in the second section, a plurality of second blocks arranged adjacent to the first block among the plurality of blocks The brightness level determined may be a second brightness level in the first section and a first brightness level in the second section. For example, when a plurality of blocks are arranged to have a grid structure, two or more second blocks may be arranged to surround the edges of the first block. At this time, two or more second blocks may contact the edges of the first block.

According to one embodiment, the total sum of luminance levels determined to correspond to a plurality of sections for any one of a plurality of blocks may correspond to a value obtained by multiplying the total luminance level by a multiple. For example, if the total luminance level is 10.25 and the multiplier is 4, the total sum of luminance levels for specific blocks determined in each of the two sections may be 41.

According to one embodiment, when the multiplier is 3 or more, the luminance level for each block may be determined to be a luminance level corresponding to turning off the light source 252 for at least one of the plurality of sections. For example, when the multiplier is 3 or more, all light sources 252 included in the plurality of blocks may be turned off for a predetermined time corresponding to one of the plurality of sections according to the period corresponding to the reference dimming frequency.

In operation S850, the image display device 100 may output light corresponding to the luminance level for each block determined to correspond to a plurality of sections through the light source 252. For example, the control unit 170 may output a dimming value corresponding to the luminance level for each block for a plurality of blocks to the backlight unit 250 according to a dimming frequency that is a multiple of the reference dimming frequency. At this time, the backlight unit 250 may operate so that light corresponding to the luminance level of each block is emitted through a plurality of blocks, based on the dimming value corresponding to the luminance level of each block received from the control unit 170.

Meanwhile, in operation S860, the image display device 100 may output light corresponding to the overall luminance level through the light source 252, based on the fact that the overall luminance level corresponds to a preset main luminance level. For example, the control unit 170 may output a dimming value corresponding to the overall luminance level to the backlight unit 250 according to the reference dimming frequency. At this time, the backlight unit 250 may operate to emit light corresponding to the overall luminance level through a plurality of blocks, based on the dimming value corresponding to the overall luminance level received from the control unit 170.

Referring to FIGS. 9 to 12, the backlight unit 250 can adjust the output of light through a plurality of blocks based on the dimming values determined for the plurality of blocks with the reference dimming frequency preset to 120 Hz. .

9 to 12, when a plurality of blocks are arranged to have a grid structure, blocks arranged in odd-numbered columns from odd-numbered rows and blocks arranged in even-numbered columns from even-numbered rows are the first block and even-numbered blocks in odd-numbered rows. Blocks arranged in the th column and in the odd-numbered columns from the even-numbered rows will be described by way of example as second blocks.

Referring to FIG. 9, when the total luminance level is 0 corresponding to the main luminance level, the backlight unit 250 emits light corresponding to the main luminance level 0 through a plurality of blocks according to the reference dimming frequency of 120 Hz. Can be released (910). At this time, when the luminance level corresponding to turning off the light source 252 is 0, the backlight unit 250 turns off the light source 252 so that the emission of light through the plurality of blocks is stopped according to the reference dimming frequency of 120 Hz. You can.

Meanwhile, when the total brightness level is 9 or 10 corresponding to the main brightness level, the backlight unit 250 emits light corresponding to the main brightness level 9 or 10 through a plurality of blocks according to the reference dimming frequency of 120 Hz. It can be done (920, 930).

Referring to FIG. 10, when the total luminance level is 9.5, which is one half of 19 corresponding to the main luminance level, the multiplier may be determined to be 2 and the dimming frequency may be determined to be 240 Hz. Additionally, the number of the plurality of sections may be two, and the time corresponding to each of the plurality of sections may be 1/240 second.

The backlight unit 250 may emit light corresponding to the luminance level for each block through a plurality of blocks in a plurality of sections corresponding to the dimming frequency of 240 Hz. In the present disclosure, the description is based on an example in which the luminance level for one of the first block and the second block is determined to be 19, and the luminance level for the other block is determined to be 0 in any one of the plurality of sections. Not limited.

The image display device 100 may determine the luminance level for the first block to be 0 and the luminance level for the second block to be 19 in the first section corresponding to the dimming frequency of 240 Hz (1010). At this time, the backlight unit 250 may turn off the light source 252 disposed in the first block so that emission of light through the first block stops in the first section according to the dimming frequency of 240Hz. Additionally, the backlight unit 250 may emit light corresponding to the luminance level of 19 for the second block in the first section through the second block, according to the dimming frequency of 240Hz.

Meanwhile, the image display device 100 may determine the luminance level for the first block to be 19 and the luminance level for the second block to be 0 for the second section corresponding to the dimming frequency of 240 Hz (1020). At this time, the backlight unit 250 may emit light corresponding to the luminance level of 19 for the first block in the second section through the first block, according to the dimming frequency of 240Hz. Additionally, the backlight unit 250 may turn off the light source 252 disposed in the second block so that emission of light through the second block stops in the second section according to the dimming frequency of 240Hz.

Through this, a user looking at the display 180 of the video display device 100 for a time corresponding to 120Hz, which is the standard dimming frequency, can recognize the luminance level for a certain area of the display panel 210 as 9.5. .

Referring to FIG. 11, if the total luminance level is 9.33, which is one-third of 28 corresponding to the main luminance level, the multiplier may be determined to be 3 and the dimming frequency may be determined to be 360 Hz. Additionally, the number of the plurality of sections may be 3, and the time corresponding to each of the plurality of sections may be 1/360 second.

The backlight unit 250 may emit light corresponding to the luminance level for each block through a plurality of blocks in a plurality of sections corresponding to the dimming frequency of 360Hz. In the present disclosure, the description is based on an example in which the luminance level for one of the first block and the second block is determined to be 28, and the luminance level for the other block is determined to be 0 in any one of a plurality of sections. Not limited.

The image display device 100 may determine the luminance level for the first block to be 0 and the luminance level for the second block to be 28 in the first section corresponding to the dimming frequency of 360 Hz (1110). At this time, the backlight unit 250 may turn off the light source 252 disposed in the first block so that emission of light through the first block stops in the first section according to the dimming frequency of 360Hz. Additionally, the backlight unit 250 may emit light corresponding to the luminance level of 28 for the second block in the first section through the second block, according to the dimming frequency of 360Hz.

Meanwhile, the image display device 100 may determine the luminance level for the first block to be 28 and the luminance level for the second block to be 0 for the second section corresponding to the dimming frequency of 360 Hz (1120). At this time, the backlight unit 250 may emit light corresponding to the luminance level of 28 for the first block in the second section through the first block, according to the dimming frequency of 360Hz. Additionally, the backlight unit 250 may turn off the light source 252 disposed in the second block so that emission of light through the second block stops in the second section according to the dimming frequency of 360Hz.

Meanwhile, the image display device 100 may determine the luminance levels for both the first block and the second block to be 0 in the third section corresponding to the dimming frequency of 360Hz (1130). At this time, the backlight unit 250 uses the light source 252 disposed in the first block and the second block so that the emission of light through the first block and the second block is stopped in the third section according to the dimming frequency of 360Hz. Lights can be turned off.

Through this, a user looking at the display 180 of the video display device 100 for a time corresponding to 120Hz, which is the standard dimming frequency, can recognize the luminance level for a certain area of the display panel 210 as 9.33. .

Referring to FIG. 12, when the total luminance level is 9.25, which is one-third of 37 corresponding to the main luminance level, the multiplier may be determined to be 3 and the dimming frequency may be determined to be 480 Hz. Additionally, the number of multiple sections may be 4, and the time corresponding to each of the multiple sections may be 1/480 second.

The backlight unit 250 may emit light corresponding to the luminance level for each block through a plurality of blocks in a plurality of sections corresponding to the dimming frequency of 480 Hz. In the present disclosure, the description is based on an example in which the luminance level for one of the first block and the second block is determined to be 37 and the luminance level for the other block is determined to be 0 in any one of the plurality of sections. Not limited.

The image display device 100 may determine the luminance level for the first block to be 0 and the luminance level for the second block to be 37 for the first section corresponding to the dimming frequency of 480 Hz (1210). At this time, the backlight unit 250 may turn off the light source 252 disposed in the first block so that emission of light through the first block stops in the first section according to the dimming frequency of 480Hz. Additionally, the backlight unit 250 may emit light corresponding to the luminance level of 37 for the second block in the first section through the second block, according to the dimming frequency of 480Hz.

Meanwhile, the image display device 100 may determine the luminance level for the first block to be 37 and the luminance level for the second block to be 0 in the third section corresponding to the dimming frequency of 480 Hz (1120). At this time, the backlight unit 250 may emit light corresponding to the luminance level of 37 for the first block in the second section through the first block, according to the dimming frequency of 480Hz. Additionally, the backlight unit 250 may turn off the light source 252 disposed in the second block so that emission of light through the second block stops in the second section according to the dimming frequency of 480Hz.

Meanwhile, the image display device 100 may determine the luminance levels for both the first block and the second block to be 0 for the second and fourth sections corresponding to the dimming frequency of 480 Hz (1220, 1240). . At this time, the backlight unit 250 is disposed in the first block and the second block so that emission of light through the first block and the second block is stopped in the second section and the fourth section, respectively, according to the dimming frequency of 480Hz. The light source 252 can be turned off. That is, when the multiplier is 4 or more, at least one section in which the luminance levels for a plurality of blocks among the plurality of sections are all determined to be 0 is two sections in which the level of at least one of the first block and the second block exceeds 0. It can be located between sections.

Through this, a user looking at the display 180 of the video display device 100 for a time corresponding to 120 Hz, which is the standard dimming frequency, can recognize the luminance level for a certain area of the display panel 210 as 9.25. .

Figure 13 is a flowchart of a method of operating an image display device according to an embodiment of the present disclosure. Detailed description of content that overlaps with the content described in FIG. 8 will be omitted.

Referring to FIG. 13, the image display device 100 may determine the overall luminance level for a predetermined area of the display panel 210 in operation S1310.

The video display device 100 may determine whether the overall luminance level corresponds to a preset main luminance level in operation S1320.

In operation S1330, the video display device 100 may determine whether the overall luminance level corresponds to a preset sub-luminance level based on the fact that the overall luminance level does not correspond to the preset main luminance level. Here, the sub-luminance level may be a luminance level corresponding to the main luminance level divided by an integer corresponding to the multiple. For example, the plurality of luminance levels corresponding to the sub luminance levels may be a set of luminance levels corresponding to the main luminance level divided by 2, 3, and 4, which are integers corresponding to multiples, respectively.

In operation S1340, the image display device 100 may determine the dimming frequency according to frequency multiplication based on the fact that the total luminance level corresponds to a preset sub-luminance level.

The image display device 100 may determine the luminance level for each block corresponding to a plurality of sections for a plurality of blocks corresponding to a predetermined area of the display panel 210 in operation S1350.

In operation S1360, the image display device 100 may output light corresponding to the luminance level for each block determined to correspond to a plurality of sections through the light source 252.

Meanwhile, in operation S1370, the image display device 100 sets a gain value for the driving signal based on the total luminance level based on the fact that the total luminance level does not correspond to the preset main luminance level and the sub-luminance level. You can decide. For example, as the gain value for the driving signal increases, the power supplied from the power supply unit 190 to the backlight unit 250 may increase.

Referring to FIG. 14, when the first luminance level is 9.25, the first luminance level corresponds to the main luminance level, 37, divided by 4, an integer corresponding to the multiple, so the first luminance level corresponds to the sub luminance level. can do. Additionally, when the second luminance level is 9.5, the second luminance level corresponds to the value obtained by dividing 19, the main luminance level, by 2, which is an integer corresponding to the multiple, so the second luminance level may also correspond to a sub luminance level.

Meanwhile, when the third luminance level is 9.7, the third luminance level may not correspond to both the main luminance level and the sub luminance level. At this time, the image display device 100 may determine the dimming value output to the backlight unit 250 to be 10, the main luminance level, corresponding to 9.7, the third luminance level. Additionally, the image display device 100 may determine the gain value for the driving signal to be 0.97 based on 9.7, which is the third luminance level, and 10, the main luminance level corresponding to the third luminance level.

The image display device 100 may output light corresponding to the entire luminance level through the light source 252 in operation S1380.

For example, based on the fact that the total brightness level corresponds to a preset main brightness level, the control unit 170 outputs a dimming value corresponding to the total brightness level to the backlight unit 250 according to the reference dimming frequency of 120 Hz. can do. At this time, the backlight unit 250 may operate to emit light corresponding to the overall luminance level through a plurality of blocks, based on the dimming value corresponding to the overall luminance level received from the control unit 170.

For example, based on the fact that the total luminance level does not correspond to the preset main luminance level and the sub-luminance level, the controller 170 corresponds to the main luminance level corresponding to the total luminance level according to the reference dimming frequency of 120 Hz. The dimming value can be output to the backlight unit 250. At this time, the control unit 170 may control the power supply unit 190 to supply power to the backlight unit 250 according to a gain value corresponding to the overall luminance level.

As described above, according to at least one embodiment of the present disclosure, despite limitations on the size of data used for brightness adjustment, the brightness of the screen area can be adjusted in various ways.

Additionally, according to at least one embodiment of the present disclosure, light may be output so that the luminance of the screen area is constant throughout the screen area.

The attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes, equivalents, and changes included in the spirit and technical scope of the present disclosure are not limited. It should be understood to include water or substitutes.

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

In addition, although the preferred embodiments of the present disclosure have been shown and described above, the present disclosure is not limited to the specific embodiments described above, and the technical field to which the disclosure pertains without departing from the gist of the present disclosure as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical ideas or perspectives of the present disclosure.

Claims (10)

display panel;
A backlight unit including a plurality of blocks composed of light sources; and
Includes a control unit,
The control unit,
Based on the fact that the total luminance level corresponding to the image output through a predetermined area of the display panel corresponds to a preset main luminance level, the backlight unit transmits a first signal corresponding to the total luminance level according to a predetermined dimming frequency. Print it out as,
Based on the overall luminance level corresponding to a sub-luminance level different from the main luminance level, block by block for a plurality of blocks corresponding to the predetermined area, according to a multiple of the predetermined dimming frequency corresponding to the overall luminance level. Outputting a second signal corresponding to the luminance level to the backlight unit,
The luminance level for each block corresponds to the main luminance level,
The backlight unit, based on the second signal,
In a first section among a plurality of sections included in a predetermined period corresponding to the predetermined dimming frequency, while light corresponding to the first luminance level is emitted through the first block, adjacently disposed to surround the first block Operates to emit light corresponding to a second luminance level through the plurality of second blocks,
In a second section of the plurality of sections, while light corresponding to the second luminance level is emitted through the first block, light corresponding to the first luminance level is emitted through the plurality of second blocks. A video display device characterized in that it operates. According to paragraph 1,
An image display device, wherein the plurality of second blocks are arranged to contact an edge of the first block. According to paragraph 1,
One of the first brightness level and the second brightness level is a value obtained by multiplying the total brightness level by an integer corresponding to a multiple of the predetermined dimming frequency,
The remaining one of the first brightness level and the second brightness level is a brightness level corresponding to turning off the light source. According to paragraph 1,
An image display device, characterized in that the number of the plurality of sections corresponds to a multiple of the predetermined dimming frequency. According to paragraph 1,
The total sum of the luminance levels for the first block corresponding to each of the plurality of sections is a value obtained by multiplying the total luminance level by an integer corresponding to a multiple of a predetermined dimming frequency. According to paragraph 1,
When the integer corresponding to the multiple of the predetermined dimming frequency is 3 or more, the luminance level for the first block and the plurality of second blocks corresponding to the third section among the plurality of sections is the luminance level corresponding to turning off the light source. A video display device characterized by a level. According to clause 6,
When the integer corresponding to the multiple of the predetermined dimming frequency is 4 or more, the third section is located between the first section and the second section. According to paragraph 1,
Further comprising a power supply unit that supplies power to the backlight unit,
The control unit,
Based on the total luminance level not corresponding to the main luminance level and the sub luminance level, determining a gain value based on the total luminance level,
An image display device characterized in that the power supplied from the power supply unit to the backlight unit is adjusted according to the gain value. According to clause 8,
The control unit,
Based on the fact that the overall luminance level does not correspond to the main luminance level and the sub luminance level, determining a specific luminance level corresponding to the overall luminance level among a plurality of luminance levels corresponding to the main luminance level,
An image display device characterized in that, according to the predetermined dimming frequency, a third signal corresponding to the specific luminance level is output to the backlight unit. According to paragraph 1,
An image display device, wherein the plurality of driving units each include at least one driver integrated circuit (IC) that adjusts the intensity of light emitted from a corresponding block among the plurality of blocks.

Images