Video display device and method for operating same

Abstract

The present disclosure relates to a video display apparatus and a method for operating same. A video display device according to one embodiment of the present disclosure comprises: a display; a power supply unit for supplying driving power to the display; and a control unit, wherein the power supply unit includes a full-bridge converter including a plurality of switching elements, the control unit calculates a first switching frequency corresponding to a pulse frequency modulation (PFM), controls the plurality of switching elements on the basis of the first switching frequency according to the PFM method if the first switching frequency is lower than a preset maximum frequency, and controls the plurality of switching elements on the basis of a second switching frequency according to a phase shift method if the first switching frequency is equal to or greater than the maximum frequency.

Description

Video display device and its operating method

[0001] The present disclosure relates to a video display device and an operating method thereof.

[0002] A video display device is a device that displays images for the user to view. For example, a video display device may include a television (TV), monitor, or notebook computer equipped with a liquid crystal display (LCD) using liquid crystals or an organic light-emitting diode (OLED) display using organic light-emitting diodes (OLED).

[0003] Typically, electronic devices such as video display devices are equipped with a power supply unit (PSU) that supplies operating power. Furthermore, electronic devices that utilize AC power may incorporate features designed to efficiently utilize power. For example, such devices may include a power factor correction (PFC) circuit that compensates for the power factor of the input power, and a converter that adjusts the voltage output from the PFC circuit.

[0004] Meanwhile, when a resonant converter operating in pulse frequency modulation (PFM) is applied to the power supply, the switching frequency of the switching elements is adjusted according to the load size. As the load decreases, the switching frequency increases, and the lower the voltage output from the converter, the higher the switching frequency can be even under light load conditions.

[0005] However, as the switching frequency increases, problems such as switching loss of the switching element and core loss of the resonant tank increase. In addition, electromagnetic interference (EMI) is one of the important issues in the design of a power supply that utilizes switching operation. If the switching frequency increases above a certain frequency value, for example, 150 kHz, an EMI filter needs to be added to the power supply to meet the requirements related to conducted emissions (CE). This causes problems such as an increase in the size of the power supply, an increase in production cost, and a complex implementation. In addition, when a limit value for the switching frequency is set to limit an excessive increase in the switching frequency, there is a problem that the variable displacement of the voltage output from the converter is limited.

[0006] The present disclosure aims to solve the above-mentioned and other problems.

[0007] Another purpose is to provide a video display device and an operating method thereof that can change the method of controlling a switching element according to a frequency band of a switching frequency in accordance with a change in load.

[0008] Another purpose is to provide a video display device and an operating method thereof that can change the method of controlling a switching element according to the frequency band of the switching frequency depending on the magnitude of the voltage output from the transformer circuit.

[0009] Another object is to provide a video display device and an operating method thereof that can be equipped with a transformer optimized for various methods of controlling a switching element.

[0010] In order to achieve the above object, an image display device according to one embodiment of the present disclosure comprises: a display; a power supply unit that supplies driving power to the display; and a control unit, wherein the power supply unit includes a full-bridge converter including a plurality of switching elements, and the control unit calculates a first switching frequency corresponding to a PFM (Pulse Frequency Modulation) method, and when the first switching frequency is lower than a preset maximum frequency, controls the plurality of switching elements based on the first switching frequency according to the PFM method, and when the first switching frequency is higher than the maximum frequency, controls the plurality of switching elements based on a second switching frequency according to a phase shift method.

[0011] In order to achieve the above object, an operating method of an image display device including a full-bridge converter according to one embodiment of the present disclosure may include: an operation of calculating a first switching frequency corresponding to a PFM (Pulse Frequency Modulation) method; an operation of controlling a plurality of switching elements included in the full-bridge converter based on the first switching frequency according to the PFM method when the first switching frequency is less than a preset maximum frequency; and an operation of controlling the plurality of switching elements based on a second switching frequency according to a phase shift method when the first switching frequency is equal to or greater than the maximum frequency.

[0012] The effects of the video display device and its operating method according to the present disclosure are described as follows.

[0013] According to at least one embodiment of the present disclosure, a method of controlling a switching element can be changed according to a frequency band of a switching frequency in accordance with a change in a load, thereby limiting an excessive increase in the switching frequency.

[0014] According to at least one embodiment of the present disclosure, a method of controlling a switching element can be changed depending on the frequency band of the switching frequency according to the magnitude of the output voltage, thereby limiting an excessive increase in the switching frequency.

[0015] According to at least one embodiment of the present disclosure, electromagnetic compatibility (EMC) can be improved without providing an additional EMI filter, thereby preventing an increase in the size of the power supply and an increase in production cost.

[0016] According to at least one embodiment of the present disclosure, a transformer optimized for various methods of controlling a switching element can be provided.

[0017] Further scope of the applicability of the present disclosure will become apparent from the detailed description below. However, since various modifications and variations within the spirit and scope of the present disclosure will become apparent to those skilled in the art, it should be understood that the detailed description and specific examples, such as preferred embodiments of the present disclosure, are given by way of example only.

[0018] FIG. 1 is a diagram illustrating an image display system according to one embodiment of the present disclosure.

[0019] Figure 2 is an internal block diagram of the image display device of Figure 1.

[0020] Figure 3 is an internal block diagram of the control unit of Figure 2.

[0021] FIG. 4a is a drawing illustrating a control method of the remote control device of FIG. 2, and FIG. 4b is an example of an internal block diagram of the remote control device of FIG. 2.

[0022] Figure 5 is an example of an internal block diagram of the display of Figure 2.

[0023] FIG. 6a and FIG. 6b are drawings referenced in the description of the organic light-emitting panel of FIG. 5.

[0024] Figure 7 is an internal block diagram of the power supply unit of Figure 2.

[0025] Fig. 8 is an internal circuit diagram of the transformer circuit of Fig. 7.

[0026] FIGS. 9A and 9B are flowcharts of an operation method of an image display device according to one embodiment of the present disclosure.

[0027] FIGS. 10 to 14 are drawings that are referenced in the description of the operation of the image display device according to embodiments of the present disclosure.

[0028] Figure 15 is an exploded perspective view of a transformer according to embodiments of the present disclosure.

[0029] Hereinafter, the present disclosure will be described in detail with reference to the drawings. In the drawings, portions irrelevant to the description are omitted to clearly and concisely describe the present disclosure, and the same reference numerals are used for identical or extremely similar portions throughout the specification.

[0030] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0031] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0032] Additionally, while terms such as "first" and "second" may be used in this specification to describe various elements, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0033] FIG. 1 is a diagram illustrating an image display system according to various embodiments of the present invention.

[0034] Referring to FIG. 1, the image display system (10) may include an image display device (100) and / or a remote control device (200).

[0035] The image display device (100) may be a device that processes and outputs an image. The image display device (100) is not particularly limited as long as it can output a screen corresponding to an image signal, such as a TV, a notebook computer, or a monitor.

[0036] The video display device (100) can receive a broadcast signal, process the signal, and output the processed broadcast image. When the video display device (100) receives a broadcast signal, the video display device (100) may correspond to a broadcast receiving device.

[0037] The video display device (100) can receive broadcast signals wirelessly via an antenna, or can receive broadcast signals wired via a cable. For example, the video display device (100) can receive terrestrial broadcast signals, satellite broadcast signals, cable broadcast signals, IPTV (Internet Protocol Television) broadcast signals, etc.

[0038] The remote control device (200) can be connected to the image display device (100) by wire and / or wirelessly, and can provide various control signals to the image display device (100). At this time, the remote control device (200) can include a device that establishes a wired or wireless network with the image display device (100), and transmits various control signals to the image display device (100) through the established network, or receives signals related to various operations processed in the image display device (100) from the image display device (100).

[0039] For example, various input devices such as a mouse, keyboard, space remote control, trackball, joystick, etc. can be used as the remote control device (200). The remote control device (200) can be referred to as an external device, and it is to be noted in advance that external devices and remote control devices can be used interchangeably as needed.

[0040] The video display device (100) can be connected to only a single remote control device (200) or can be connected to two or more remote control devices (200) simultaneously, and can change objects displayed on the screen or adjust the status of the screen based on control signals provided from each remote control device (200).

[0041] Figure 2 is an internal block diagram of the image display device of Figure 1.

[0042] Referring to FIG. 2, the video display device (100) may include a broadcast receiving unit (105), an external device interface unit (130), a network interface unit (135), a storage unit (140), a user input interface unit (150), an input unit (160), a control unit (170), a display (180), an audio output unit (185), and / or a power supply unit (190).

[0043] The broadcast receiving unit (105) may include a tuner unit (110) and a demodulator unit (120).

[0044] Meanwhile, unlike the drawing, the image display device (100) may include only the broadcast reception unit (105) and the external device interface unit (130) among the broadcast reception unit (105), the external device interface unit (130), and the network interface unit (135). That is, the image display device (100) may not include the network interface unit (135).

[0045] The tuner unit (110) can select a broadcast signal corresponding to a channel selected by the user or all previously stored channels among broadcast signals received via 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.

[0046] For example, the tuner unit (110) can convert the selected broadcast signal into a digital IF signal (DIF) if it is a digital broadcast signal, and can convert it into an analog baseband video or audio signal (CVBS / SIF) if it is an analog broadcast signal. That is, the tuner unit (110) can process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS / SIF) output from the tuner unit (110) can be directly input to the control unit (170).

[0047] Meanwhile, the tuner unit (110) can sequentially select broadcast signals of all broadcast channels stored through the channel memory function among the received broadcast signals and convert them into intermediate frequency signals or baseband video or audio signals.

[0048] Meanwhile, the tuner unit (110) may be equipped with multiple tuners to receive broadcast signals of multiple channels. Alternatively, a single tuner that simultaneously receives broadcast signals of multiple channels is also possible.

[0049] The demodulation unit (120) can perform a demodulation operation by receiving a digital IF signal (DIF) converted by the tuner unit (110).

[0050] The demodulation unit (120) can output a stream signal (TS) after performing demodulation and channel decoding. At this time, the stream signal may be a signal in which a video signal, an audio signal, or a data signal is multiplexed.

[0051] The stream signal output from the demodulation unit (120) can be input to the control unit (170). The control unit (170) can output an image through the display (180) and output an audio through the audio output unit (185) after performing demultiplexing, image / audio signal processing, etc.

[0052] 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).

[0053] The external device interface unit (130) can be connected to external devices such as a DVD (Digital Versatile Disk), Blu-ray, game device, camera, camcorder, computer (laptop), set-top box, etc., via wired / wireless connection, and can also perform input / output operations with the external devices.

[0054] In addition, the external device interface unit (130) can establish a communication network with various remote control devices (200) as illustrated in FIG. 1, and receive a control signal related to the operation of the image display device (100) from the remote control device (200) or transmit data related to the operation of the image display device (100) to the remote control device (200).

[0055] The A / V input / output unit can receive video and audio signals from an external device. For example, the A / V input / output unit can include an Ethernet terminal, a USB terminal, a CVBS (Composite Video Banking Sync) terminal, a component terminal, an S-video terminal (analog), a DVI (Digital Visual Interface) terminal, an HDMI (High Definition Multimedia Interface) terminal, an MHL (Mobile High-definition Link) terminal, an RGB terminal, a D-SUB terminal, an IEEE 1394 terminal, an SPDIF terminal, a Liquid HD terminal, etc. Digital signals input through these terminals can be transmitted to the control unit (170). At this time, analog signals input through the CVBS terminal and the S-video terminal can be converted into digital signals through an analog-to-digital converter (not shown) and transmitted to the control unit (170).

[0056] The external device interface unit (130) may include a wireless communication unit (not shown) for short-range 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, in mirroring mode, the external device interface unit (130) may receive device information, running application information, application images, etc. from the mobile terminal.

[0057] The external device interface unit (130) can perform short-range wireless communication using Bluetooth, RFID (Radio Frequency Identification), infrared communication (IrDA, infrared Data Association), UWB (Ultra-Wideband), ZigBee, etc.

[0058] The network interface unit (135) can provide an interface for connecting the video display device (100) to a wired / wireless network including the Internet.

[0059] 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) may include a communication module for WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed ​​Downlink Packet Access), etc.

[0060] The network interface unit (135) can transmit or receive data to or from other users or other electronic devices via the connected network or another network linked to the connected network.

[0061] The network interface unit (135) can 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, broadcasts, etc., and information related thereto provided by a content provider or network provider via a network.

[0062] The network interface unit (135) can receive firmware update information and update files provided by the network operator, and transmit data to the Internet or content provider or network operator.

[0063] The network interface unit (135) can select and receive a desired application from among applications open to the public through a network.

[0064] The storage unit (140) may store programs for signal processing and control within the control unit (170), or may store processed video, audio, or data signals. For example, the storage unit (140) may store application programs designed for the purpose of performing various tasks that can be processed by the control unit (170), and may selectively provide some of the stored application programs upon request from the control unit (170).

[0065] Programs stored in the storage unit (140) are not particularly limited as long as they can be executed by the control unit (170).

[0066] The storage unit (140) may also perform a function for temporarily storing video, audio, or data signals received from an external device through the external device interface unit (130).

[0067] The storage unit (140) can store information about a specific broadcast channel through a channel memory function such as a channel map.

[0068] Although the storage unit (140) of FIG. 2 is provided separately from the control unit (170), the scope of the present invention is not limited thereto, and the storage unit (140) may be included within the control unit (170).

[0069] The storage unit (140) may include at least one of volatile memory (e.g., DRAM, SRAM, SDRAM, etc.) or non-volatile memory (e.g., flash memory, hard disk drive (HDD), solid-state drive (SSD), etc.). In various embodiments of the present invention, the storage unit (140) and memory may be used interchangeably.

[0070] The user input interface unit (150) can transmit a signal input by the user to the control unit (170) or transmit a signal from the control unit (170) to the user.

[0071] For example, a user input signal such as power on / off, channel selection, screen setting, etc. may be transmitted / received from a remote control device (200), a user input signal input from a local key (not shown) such as a power key, a channel key, a volume key, a setting value, etc. may be transmitted to the control unit (170), a user input signal input from a sensor unit (not shown) that senses a user's gesture may be transmitted to the control unit (170), or a signal from the control unit (170) may be transmitted to the sensor unit.

[0072] The input unit (160) may be provided on one side of the main body of the video display device (100). For example, the input unit (160) may include a touch pad, a physical button, etc.

[0073] The input unit (160) can receive various user commands related to the operation of the video display device (100) and transmit a control signal corresponding to the input command to the control unit (170).

[0074] The input unit (160) may include at least one microphone (not shown) and may receive the user's voice through the microphone.

[0075] 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.

[0076] The control unit (170) can demultiplex a stream input through the tuner unit (110), the demodulator unit (120), the external device interface unit (130), or the network interface unit (135), or process the demultiplexed signals to generate and output a signal for video or audio output.

[0077] The display (180) can generate a driving signal by converting a video signal, data signal, OSD signal, control signal, etc. processed by the control unit (170) or a video signal, data signal, control signal, etc. received from the external device interface unit (130).

[0078] The display (180) may include a display panel (not shown) having a plurality of pixels.

[0079] The plurality of pixels provided on the display panel may have RGB sub-pixels. Alternatively, the plurality of pixels provided on the display panel may have RGBW sub-pixels. 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 the plurality of pixels.

[0080] The display (180) can be a PDP (Plasma Display Panel), an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diode), a flexible display, etc., and may also be a 3D display. The 3D display (180) can be divided into a glasses-free type and a glasses type.

[0081] Meanwhile, the display (180) is configured as a touch screen and can be used as an input device in addition to an output device.

[0082] The audio output unit (185) receives a signal processed by the control unit (170) and outputs it as voice.

[0083] The image signal processed by the control unit (170) can be input to the display (180) and displayed as an image corresponding to the image signal. In addition, the image signal processed by the control unit (170) can also be input to an external output device through the external device interface unit (130).

[0084] The voice signal processed in the control unit (170) can be output as sound to the audio output unit (185). In addition, the voice signal processed in the control unit (170) can be input to an external output device through the external device interface unit (130).

[0085] Although not shown in FIG. 2, the control unit (170) may include a demultiplexing unit, an image processing unit, etc. This will be described later with reference to FIG. 3.

[0086] In addition, the control unit (170) can control the overall operation within the video display device (100). For example, the control unit (170) can control the tuner unit (110) to select (tune) a broadcast corresponding to a channel selected by the user or a previously stored channel.

[0087] In addition, the control unit (170) can control the image display device (100) by a user command or internal program input through the user input interface unit (150).

[0088] 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.

[0089] Meanwhile, the control unit (170) can cause a predetermined 2D object to be displayed within an image displayed on the display (180). For example, the object can be at least one of a connected web screen (newspaper, magazine, etc.), an EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

[0090] Meanwhile, the image display device (100) may further include a camera (not shown). The camera can capture images of a user. The camera can be implemented with a single camera, but is not limited thereto, and may also be implemented with multiple cameras. Meanwhile, the camera can be embedded in the image display device (100) above the display (180) or can be separately positioned. Image information captured by the camera can be input to the control unit (170).

[0091] The control unit (170) can recognize the user's location based on the image captured by the camera. For example, the control unit (170) can determine the distance (z-axis coordinate) between the user and the image display device (100). In addition, the control unit (170) can determine the x-axis coordinate and y-axis coordinate within the display (180) corresponding to the user's location.

[0092] The control unit (170) can detect the user's gesture based on an image captured from the camera unit, a signal detected from the sensor unit, or a combination thereof.

[0093] The power supply unit (190) can supply power to the entire image display device (100). In particular, it can supply power to a control unit (170) that can be implemented in the form of a system on chip (SOC), a display (180) for image display, and an audio output unit (185) for audio output.

[0094] Specifically, the power supply unit (190) may be equipped with a converter (not shown) that converts AC power into DC power and a Dc / Dc converter (not shown) that converts the level of DC power.

[0095] The remote control device (200) can transmit user input to the user input interface unit (150). To this end, the remote control device (200) can use Bluetooth, RF (Radio Frequency) communication, infrared (Infrared Radiation) communication, UWB (Ultra-wideband), ZigBee, etc. In addition, the remote control device (200) can receive images, voices, or data signals output from the user input interface unit (150) and display or output the same as voice on the remote control device (200).

[0096] Meanwhile, the above-described video display device (100) may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasts.

[0097] Meanwhile, the block diagram of the image display device (100) illustrated in FIG. 2 is only a block diagram for one embodiment of the present invention, and each component of the block diagram may be integrated, added, or omitted depending on the specifications of the image display device (100) actually implemented.

[0098] That is, two or more components may be combined into a single component, or a single component may be subdivided into two or more components, as needed. Furthermore, the functions performed by each block are intended to illustrate embodiments of the present invention, and their specific operations or devices do not limit the scope of the present invention.

[0099] Figure 3 is an internal block diagram of the control unit of Figure 2.

[0100] Referring to FIG. 3, a control unit (170) according to one embodiment of the present invention may include a demultiplexer (310), an image processing unit (320), a processor (330), an OSD generation unit (340), a mixer (345), a frame rate conversion unit (350), and / or a formatter (360). In addition, an audio processing unit (not shown) and a data processing unit (not shown) may be further included.

[0101] The demultiplexer (310) can demultiplex an input stream. For example, when MPEG-2 TS is input, it can be demultiplexed to separate it into video, audio, and data signals, respectively. Here, the stream signal input to the demultiplexer (310) may be a stream signal output from the tuner (110), the demodulator (120), or the external device interface (130).

[0102] The image processing unit (320) can perform image processing of a demultiplexed image signal. To this end, the image processing unit (320) may be equipped with an image decoder (325) and a scaler (335).

[0103] The video decoder (325) can decode a 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).

[0104] The video decoder (325) may include decoders of various standards. For example, it may include an MPEG-2, H.264 decoder, a 3D video decoder for color images and depth images, a decoder for multi-view images, etc.

[0105] The processor (330) can control the overall operation within the video display device (100) or the control unit (170). For example, the processor (330) can control the tuner (110) to select (tune) a broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0106] In addition, the processor (330) can control the image display device (100) by a user command or internal program input through the user input interface unit (150).

[0107] Additionally, the processor (330) can perform data transmission control with the network interface unit (135) or the external device interface unit (130).

[0108] Additionally, the processor (330) can control the operation of the demultiplexing unit (310), the image processing unit (320), the OSD generation unit (340), etc. within the control unit (170).

[0109] The OSD generation unit (340) can generate OSD signals based on user input or on its own. For example, based on a user input signal input through the input unit (160), it can generate signals for displaying various information in the form of graphics or text on the screen of the display (180).

[0110] The generated OSD signal may include various data such as the user interface screen of the video display device (100), various menu screens, widgets, icons, etc. In addition, the generated OSD signal may include a 2D object or a 3D object.

[0111] Additionally, the OSD generation unit (340) can generate a pointer that can be displayed on the display (180) based on a pointing signal input from the remote control device (200).

[0112] The OSD generation unit (340) may include a pointing signal processing unit (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 generation unit (240).

[0113] The mixer (345) can mix the OSD signal generated by the OSD generation unit (340) and the decoded image signal processed by the image processing unit (320). The mixed image signal can be provided to the frame rate conversion unit (350).

[0114] The frame rate converter (FRC) (350) can convert the frame rate of an input video. Meanwhile, the frame rate converter (350) can also output the video as is without a separate frame rate conversion.

[0115] The formatter (360) can arrange left-eye image frames and right-eye image frames of a frame rate-converted 3D image. In addition, it can output a synchronization signal (Vsync) for opening the left-eye glasses and right-eye glasses of a 3D viewing device (not shown).

[0116] Meanwhile, the formatter (360) can change the format of the input video signal into a video signal for display on the display (180) and output it.

[0117] Additionally, the formatter (360) can change the format of a 3D video signal. For example, it can change the format to any one of various 3D formats, such as a side-by-side format, a top-down format, a frame sequential format, an interlaced format, and a checker box format.

[0118] Meanwhile, the formatter (360) can also convert a 2D image signal into a 3D image signal. For example, according to a 3D image generation algorithm, an edge or a selectable object can be detected within a 2D image signal, and an object or a selectable object according to the detected edge can be separated and generated as a 3D image signal. At this time, the generated 3D image signal can be separated and aligned into a left-eye image signal (L) and a right-eye image signal (R), as described above.

[0119] Meanwhile, although not shown in the drawing, a 3D processor (not shown) for 3D effect signal processing may be further placed after the formatter (360). This 3D processor may process brightness, tint, and color adjustments of the image signal to improve the 3D effect. For example, it may perform signal processing to make the image clear at a close distance and blurry at a long distance. Meanwhile, the function of this 3D processor may be incorporated into the formatter (360) or incorporated into the image processing unit (320).

[0120] Meanwhile, the audio processing unit (not shown) within the control unit (170) can perform audio processing of the demultiplexed audio signal. For this purpose, the audio processing unit (not shown) can be equipped with various decoders.

[0121] Additionally, the audio processing unit (not shown) within the control unit (170) can process bass, treble, volume control, etc.

[0122] A data processing unit (not shown) within the control unit (170) can perform data processing of a 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 (EPG) information that includes broadcast information such as the start time and end time of a broadcast program broadcast on each channel.

[0123] Meanwhile, the block diagram of the control unit (170) illustrated in FIG. 3 is only a block diagram for one embodiment of the present invention, and each component of the block diagram may be integrated, added, or omitted depending on the specifications of the control unit (170) actually implemented.

[0124] In particular, the frame rate conversion unit (350) and the formatter (360) are not provided within the control unit (170), but may be provided separately, or may be provided separately as one module.

[0125] FIG. 4a is a drawing illustrating a control method of the remote control device of FIG. 2, and FIG. 4b is an example of an internal block diagram of the remote control device of FIG. 2.

[0126] Referring to FIG. 4a, it can be confirmed that a pointer (205) corresponding to a remote control device (200) is displayed on the display (180) of the video display device (100).

[0127] Referring to (a) of Fig. 4a, the user can move or rotate the remote control device (200) up and down, left and right, forward and backward. At this time, the pointer (205) displayed on the display (180) of the image display device (100) can be displayed in response to the movement of the remote control device (200). Since the pointer (205) of this remote control device (200) moves and is displayed according to the movement in 3D space, as shown in the drawing, it can be called a space remote control or a 3D pointing device.

[0128] Referring to (b) of FIG. 4a, when the user moves the remote control device (200) to the left, it can be confirmed that the pointer (205) displayed on the display (180) of the image display device (100) also moves to the left in response to the movement of the remote control device (200).

[0129] Information about the movement of the remote control device (200) detected through the sensor of the remote control device (200) can be transmitted to the image display device (100). The image display device (100) can calculate the coordinates of the pointer (205) from the information about the movement of the remote control device (200). The image display device (100) can display the pointer (205) to correspond to the calculated coordinates.

[0130] Referring to (c) of FIG. 4a, a user can move the remote control device (200) away from the display (180) while pressing a specific button provided on the remote control device (200). As a result, a selection area within the display (180) corresponding to the pointer (205) can be zoomed in and displayed in an enlarged manner. Conversely, when a user moves the remote control device (200) closer to the display (180) while pressing a specific button provided on the remote control device (200), a selection area within the display (180) corresponding to the pointer (205) can be zoomed out and displayed in a reduced manner.

[0131] Meanwhile, when the remote control device (200) moves away from the display (180), the selection area may be zoomed out, and when the remote control device (200) moves closer to the display (180), the selection area may be zoomed in.

[0132] Meanwhile, when the user presses a specific button within the remote control device (200), recognition of up, down, left, and right movements may be excluded. That is, when the remote control device (200) moves away from or toward the display (180), up, down, left, and right movements may not be recognized, and only forward and backward movements may be recognized. When the user does not press a specific button within the remote control device (200), only up, down, left, and right movements of the remote control device (200) may be recognized, and accordingly, only the pointer (205) may be moved.

[0133] Meanwhile, the movement speed or movement direction of the pointer (205) can correspond to the movement speed or movement direction of the remote control device (200).

[0134] Referring to FIG. 4b, the remote control device (200) may include a wireless communication unit (220), a user input unit (230), a sensor unit (240), an output unit (250), a power supply unit (260), a storage unit (270), and / or a control unit (280).

[0135] The wireless communication unit (220) can transmit and receive signals with the image display device (100).

[0136] In this embodiment, the remote control device (200) may be equipped with an RF module (221) capable of transmitting and receiving signals with the image display device (100) according to RF (Radio frequency) communication standards. In addition, the remote control device (200) may be equipped with an IR module (223) capable of transmitting and receiving signals with the image display device (100) according to IR (Infrared radiation) communication standards.

[0137] The remote control device (200) can transmit a signal including information about the movement of the remote control device (200) to the image display device (100) through the RF module (221). The remote control device (200) can receive the signal transmitted by the image display device (100) through the RF module (221).

[0138] The remote control device (200) can transmit commands for power on / off, channel change, volume change, etc. to the video display device (100) through the IR module (223).

[0139] The user input unit (230) may be composed of a keypad, buttons, a touch pad, a touch screen, etc. The user can input commands related to the video display device (100) to the remote control device (200) by operating the user input unit (230).

[0140] When the user input unit (230) has a hard key button, the user can input a command related to the video display device (100) to the remote control device (200) through a push operation of the hard key button.

[0141] When the user input unit (230) has a touch screen, the user can input commands related to the video display device (100) using the remote control device (200) by touching the soft keys of the touch screen.

[0142] Meanwhile, the user input unit (230) may be equipped with various types of input means that can be operated by the user, such as a scroll key or a jog key, and this embodiment does not limit the scope of the present invention.

[0143] The user input unit (230) may be equipped with a microphone. The user may speak into the microphone provided in the user input unit (230). At this time, the microphone provided in the user input unit (230) may receive the voice spoken by the user.

[0144] The sensor unit (240) may be equipped with a gyro sensor (241) or an acceleration sensor (243). The gyro sensor (241) can sense the movement of the remote control device (200).

[0145] The gyro sensor (241) can sense information about the operation of the remote control device (200) based on the x, y, and z axes. The acceleration sensor (243) can sense information about the movement speed of the remote control device (200). Meanwhile, the sensor unit (240) may further include a distance measuring sensor capable of sensing the distance from the display (180).

[0146] The output unit (250) can output an image or sound corresponding to the operation of the user input unit (230) or to a signal transmitted from the image display device (100). Through the output unit (250), the user can recognize whether the user input unit (230) is being operated or whether the image display device (100) is being controlled.

[0147] The output unit (250) may include an LED module (251) including at least one light-emitting element (e.g., an LED (Light Emitting Diode)), a vibration module (253) that generates vibration, a sound output module (255) that outputs sound, and / or a display module (257) that outputs an image.

[0148] The power supply unit (260) can supply power to each component provided in the remote control device (200). The power supply unit (260) can include at least one battery (not shown).

[0149] The power supply unit (260) can prevent unnecessary power consumption by stopping the power supply to each component provided in the remote control device (200) when movement of the remote control device (200) is not detected for a predetermined period of time through the sensor unit (240).

[0150] The power supply unit (260) can resume power supply to each component equipped in the remote control device (200) when a predetermined event occurs. For example, the power supply unit (260) can resume power supply to each component when a predetermined key equipped in the remote control device (200) is operated. For example, the power supply unit (260) can resume power supply to each component equipped in the remote control device (200) when movement of the remote control device (200) is detected through the sensor unit (240).

[0151] The storage unit (270) can store various types of programs, application data, etc. required for the control or operation of the remote control device (200).

[0152] When the remote control device (200) wirelessly transmits and receives signals through the image display device (100) and the RF module (221), the remote control device (200) and the image display device (100) can transmit and receive signals through a predetermined frequency band. The control unit (280) of the remote control device (200) can store and reference information about the frequency band, etc., through which signals can be wirelessly transmitted and received between the remote control device (200) and the image display device (100) paired therewith in the storage unit (270).

[0153] The control unit (280) may include at least one processor, and may control the overall operation of the remote control device (200) using the processor included therein.

[0154] The control unit (280) can transmit a control signal corresponding to a predetermined key operation of the user input unit (230) or a control signal corresponding to the movement of the remote control device (200) sensed by the sensor unit (240) to the image display device (100) via the wireless communication unit (220).

[0155] The user input interface unit (150) of the video display device (100) may be equipped with a wireless communication unit (151) capable of transmitting and receiving signals wirelessly with a remote control device (200), and a coordinate value calculation unit (155) capable of calculating the coordinate value of a pointer corresponding to the operation of the remote control device (200).

[0156] The user input interface unit (150) can wirelessly transmit and receive signals with the remote control device (200) via the RF module (152). In addition, the user input interface unit (150) can receive signals transmitted by the remote control device (200) according to the IR communication standard via the IR module (153).

[0157] The coordinate value calculation unit (155) can calculate the coordinate values ​​(x, y) of the pointer (205) to be displayed on the display (170) by correcting hand tremors or errors from a signal corresponding to the operation of the remote control device (200) received through the wireless communication unit (151).

[0158] A transmission signal of a remote control device (200) input to a video display device (100) through a user input interface unit (150) can be transmitted to a control unit (170) of the video display device (100). The control unit (170) of the video display device (100) can check information about the operation and key operation of the remote control device (200) from the signal transmitted from the remote control device (200) and control the video display device (100) in response thereto.

[0159] As another example, the remote control device (200) can calculate the pointer coordinate values ​​corresponding to the operation and output them to the user input interface unit (150) of the image display device (100). In this case, the user input interface unit (150) of the image display device (100) can transmit information about the received pointer coordinate values ​​to the control unit (170) without a separate hand shake or error correction process.

[0160] In addition, as another example, the coordinate value calculation unit (155) may be provided inside the control unit (170) rather than the user input interface unit (150), unlike in the drawing.

[0161] Figure 5 is an example of an internal block diagram of the display of Figure 2.

[0162] Referring to FIG. 5, a display (180b) based on an organic light-emitting panel may include an organic light-emitting panel (410b), a first interface unit (430b), a second interface unit (431b), a timing controller (432b), a gate driver unit (434b), a data driver unit (436b), a memory (440b), a processor (470b), a power supply unit (490b), a current detector unit (510b), etc.

[0163] The display (180b) receives a video signal (Vd), a first DC voltage (V1), and a second DC voltage (V2), and can display a predetermined image based on the video signal (Vd).

[0164] Meanwhile, the first interface unit (430b) within the display (180b) can receive a video signal (Vd) and a first DC voltage (V1) from the signal processing device (170b).

[0165] Here, the first DC voltage (V1) can be used for the operation of the power supply (490b) and the timing controller (432b) within the display (180b).

[0166] Next, the second interface unit (431b) can receive a second DC voltage (V2) from an external power supply unit (190b). Meanwhile, the second DC voltage (V2) can be input to a data driving unit (436b) within the display (180b).

[0167] The timing controller (432b) can output a data driving signal (Sda) and a gate driving signal (Sga) based on a video signal (Vd).

[0168] For example, when the first interface unit (430b) converts an input image signal (Vd) and outputs a converted image signal (va1), the timing controller (432b) can output a data driving signal (Sda) and a gate driving signal (Sga) based on the converted image signal (va1).

[0169] The timing controller (432b) can receive, in addition to the video signal (Vd) from the signal processing device (170b), a control signal, a vertical synchronization signal (Vsync), etc.

[0170] In addition, the timing controller (432b) can output a gate drive signal (Sga) for the operation of the gate drive unit (434b) and a data drive signal (Sda) for the operation of the data drive unit (436b) based on a control signal, a vertical synchronization signal (Vsync), etc., in addition to a video signal (Vd).

[0171] The data driving signal (Sda) at this time may be a data driving signal for driving RGBW subpixels when the panel (410b) has RGBW subpixels.

[0172] Meanwhile, the timing controller (432b) can further output a control signal (Cs) to the gate driver (434b).

[0173] The gate driving unit (434b) and the data driving unit (436b) supply a scan signal and an image signal to the organic light-emitting panel (410b) through the gate line (GL) and the data line (DL), respectively, in accordance with the gate driving signal (Sga) and the data driving signal (Sda) from the timing controller (432b). Accordingly, the organic light-emitting panel (410b) displays a predetermined image.

[0174] Meanwhile, the organic light-emitting panel (410b) may include an organic light-emitting layer, and in order to display an image, a plurality of gate lines (GL) and data lines (DL) may be arranged in a matrix form to cross each pixel corresponding to the organic light-emitting layer.

[0175] Meanwhile, the data driving unit (436b) can output a data signal to the organic light-emitting panel (410b) based on the second DC voltage (V2) from the second interface unit (431b).

[0176] The power supply unit (490b) can supply various power sources to the gate driver unit (434b), the data driver unit (436b), the timing controller (432b), etc.

[0177] The current detection unit (510b) can detect the current flowing in the subpixel of the organic light-emitting panel (410b). The detected current can be input to a processor (470b) or the like for cumulative current calculation.

[0178] The processor (470b) can perform various controls within the display (180b). For example, it can control the gate driver (434b), the data driver (436b), the timing controller (432b), etc.

[0179] Meanwhile, the processor (470b) can receive information on current flowing in the subpixel of the organic light-emitting panel (410b) from the current detection unit (510b).

[0180] FIGS. 6A and 6B are drawings for reference in the description of the organic light-emitting panel of FIG. 5.

[0181] First, FIG. 6a is a drawing showing pixels within an organic light-emitting panel (410b).

[0182] Referring to FIG. 6a, the organic light-emitting panel (410b) may have a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1, W1 to Rm, Gm, Bm, Wm) intersecting therewith.

[0183] Meanwhile, a pixel (subpixel) is defined in the intersection area of ​​the scan line and the data line within the organic light-emitting panel (410b). The drawing illustrates a pixel having RGBW subpixels (SR1, SG1, SB1, SW1).

[0184] FIG. 6b illustrates the circuit of one sub-pixel within the pixel of the organic light-emitting panel of FIG. 6a.

[0185] Referring to FIG. 6b, the organic light-emitting sub-pixel circuit (CRTm) may be an active type and include a scan switching element (SW1), a storage capacitor (Cst), a driving switching element (SW2), and an organic light-emitting layer (OLED).

[0186] The scan switching element (SW1) is turned on according to an input scan signal (Vdscan) by connecting a scan line to the gate terminal. When turned on, the input data signal (Vdata) is transmitted to the gate terminal of the driving switching element (SW2) or one end of the storage capacitor (Cst).

[0187] The storage capacitor (Cst) is formed between the gate terminal and the source terminal of the driving switching element (SW2), and stores a predetermined difference between the data signal level transmitted to one end of the storage capacitor (Cst) and the DC voltage (Vdd) level transmitted to the other end of the storage capacitor (Cst).

[0188] For example, if the data signal has different levels according to the PAM (Plus Amplitude Modulation) method, the power level stored in the storage capacitor (Cst) changes depending on the level difference of the data signal (Vdata).

[0189] As another example, when the data signal has different pulse widths according to the Pulse Width Modulation (PWM) method, the power level stored in the storage capacitor (Cst) changes depending on the difference in the pulse width of the data signal (Vdata).

[0190] The driving switching element (SW2) is turned on according to the power level stored in the storage capacitor (Cst). When the driving switching element (SW2) is turned on, a driving current (IOLED) proportional to the stored power level flows to the organic light-emitting layer (OLED). Accordingly, the organic light-emitting layer (OLED) performs a light-emitting operation.

[0191] The organic light-emitting layer (OLED) includes an RGBW emission layer (EML) corresponding to a subpixel, and may include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL), and may also include a hole blocking layer.

[0192] Meanwhile, subpixels all emit white light from the organic light-emitting diode (OLED), but separate color filters are provided for green, red, and blue subpixels to implement the colors. That is, green, red, and blue subpixels each additionally have green, red, and blue color filters. On the other hand, white subpixels emit white light, so separate color filters are not required.

[0193] Meanwhile, in the drawing, a case in which a p-type MOSFET is used as the scan switching element (SW1) and the driving switching element (SW2) is exemplified, but an n-type MOSFET, or other switching elements such as a JFET, IGBT, or SIC may also be used.

[0194] Meanwhile, a pixel is a hold-type element that continues to emit light in an organic light-emitting layer (OLED) after a scan signal is applied during a unit display period, specifically, during a unit frame.

[0195] Figure 7 is an internal block diagram of the power supply unit of Figure 2.

[0196] Referring to FIG. 7, the power supply unit (190) may include a rectifier circuit (191), a PFC (Power Factor Correction) circuit (193), a transformer circuit (195), and / or a power control unit (197).

[0197] The rectifier circuit (191) can convert the input AC power into DC power and output it. The rectifier circuit (191) can perform a rectification operation by being composed of diodes, etc. For example, if the AC power source (20) is a single-phase AC power source, the rectifier circuit (191) can be composed of four diodes in a bridge configuration, and if the AC power source (20) is a three-phase AC power source, the rectifier circuit (191) can be composed of six diodes in a bridge configuration.

[0198] The PFC circuit (193) can output power by compensating the power factor of the rectified power. For example, the PFC circuit (193) can match the voltage and current of the rectified power in phase.

[0199] The PFC circuit (193) may be a boost topology. For example, the PFC circuit (193) may be implemented as a single-phase PFC circuit including one boost converter. For example, the PFC circuit (193) may be implemented as an interleaved PFC circuit including two boost converters.

[0200] The transformer circuit (195) can transform the power output from the PFC circuit (193). For example, the transformer circuit (195) can output the 24 V voltage output from the PFC circuit (193) as is. For example, the transformer circuit (195) can lower the 24 V voltage output from the PFC circuit (193) to a voltage of 18 V. At this time, the transformer circuit (195) can gradually lower the voltage output from the PFC circuit (193). Hereinafter, the voltage output from the transformer circuit (195) may be referred to as output voltage, and the current output from the transformer circuit (195) may be referred to as output current.

[0201] The transformer circuit (195) may include an LLC resonant converter. For example, the transformer circuit (195) may be implemented in the form of a full-bridge converter.

[0202] The power control unit (197) can control the operation of each component included in the power supply unit (190). For example, the power control unit (197) can control the switching of the switching elements of the boost converter included in the PFC circuit (193). For example, the power control unit (197) can control the switching of a plurality of switching elements of the LLC resonant converter included in the transformer circuit (195).

[0203] The power control unit (197) may be included in the control unit (170) or may be a separate component distinct from the control unit (170). For example, the power control unit (197) may be placed on a power board corresponding to the power supply unit (190), and the processor (330) of the control unit (170) may be placed on a main board. At this time, the power control unit (197) and the processor (330) may transmit and receive data to and from each other according to a predetermined communication method. For example, the power control unit (197) and the processor (330) may transmit and receive data to and from each other using UART (Universal asynchronous receiver / transmitter) communication.

[0204] The power control unit (197) can output a control signal to each component included in the power supply unit (190). For example, the power control unit (197) can output a control signal to the switching elements of the boost converter included in the PFC circuit (193) based on a target value for the driving power transmitted from the processor (330). For example, the power control unit (197) can output a control signal to a plurality of switching elements of the LLC resonant converter included in the transformer circuit (195) based on the size of the load transmitted from the processor (330). For example, the power control unit (197) can output a control signal to a plurality of switching elements of the LLC resonant converter included in the transformer circuit (195) based on the size of the output voltage transmitted from the processor (330).

[0205] According to one embodiment, the power control unit (197) disposed on the power board can receive a signal having a voltage value corresponding to the magnitude of the output voltage from the processor (330) disposed on the main board. For example, the magnitude of the output voltage can be 18 V when the voltage value of the signal transmitted to the power control unit (197) is 0 V to 0.6 V, 19 V when the voltage value of the signal is 0.6 V to 0.9 V, 20 V when the voltage value of the signal is 0.9 V to 1.2 V, and 24 V when the voltage value of the signal is 2.1 V to 2.4 V.

[0206] Fig. 8 is an internal circuit diagram of the transformer circuit of Fig. 7.

[0207] Referring to FIG. 8, the transformer circuit (195) may include a first switching unit (810), a transformer (820), a second switching unit (930), an input capacitor (Cin) electrically connected to an input terminal, an output capacitor (Cout) electrically connected to an output terminal, etc.

[0208] The first switching unit (810) may include a plurality of switching elements (Q1, Q2, Q3, Q4). Among the plurality of switching elements (Q1, Q2, Q3, Q4), an upper-arm switching element and a lower-arm switching element that are connected in series with each other may form a pair, so that a total of two pairs of upper-arm and lower-arm switching elements may be connected in parallel with each other. The first switching unit (810) may be composed of four switching elements connected in a full bridge form and diodes connected to each switching element. The plurality of switching elements (Q1, Q2, Q3, Q4) included in the first switching unit (810) may be switched alternately and complementarily according to a switching frequency. At this time, a high-frequency pulse voltage may be applied to the transformer (820) according to the switching of the plurality of switching elements (Q1, Q2, Q3, Q4).

[0209] The power control unit (197) can output a control signal to a plurality of switching elements (Q1, Q2, Q3, Q4) based on a pulse width modulation (PWM) method, a pulse frequency modulation (PFM) method, a phase shift method, etc. At this time, the power control unit (195) can control the switching operation of the plurality of switching elements (Q1, Q2, Q3, Q4) by adjusting the duty ratio, switching frequency, phase angle, etc. of the control signal.

[0210] The transformer (820) may include a resonant capacitor (Cr), a resonant inductor (Lr), and a magnetizing inductor (Lm). The resonant capacitor (Cr) and the resonant inductor (Lr) of the transformer (820) may control the primary voltage of the magnetizing inductor (Lm) by utilizing the LC resonance phenomenon by passing a pulse voltage output from the first switching unit (810).

[0211] The transformer (820) can convert the primary voltage into a secondary voltage according to the turns ratio and transmit it to the second switching unit (830). That is, the transformer (820) can convert the input voltage into a voltage value of a required predetermined level.

[0212] The second switching unit (830) can output the secondary voltage of the transformer (820) as a DC voltage according to the switching operation of the switching elements (Q5, Q6). A plurality of switching elements (Q5, Q6) included in the second switching unit (830) can be switched alternately and complementarily.

[0213] In the present disclosure, a synchronous rectifier type series resonant converter is described as an example, in which a second switching unit (830) composed of a reverse-conducting metal-oxide semiconductor field effect transistor (MOSFET) is connected to a transformer (820) instead of a typical diode rectifier. When the second switching unit (830) is used as a rectifier, conduction loss can be effectively reduced compared to when a typical diode rectifier is used.

[0214] FIGS. 9A and 9B are flowcharts of an operation method of an image display device according to one embodiment of the present disclosure.

[0215] Referring to FIG. 9A, the image display device (100) can set the switching frequency for the operation of the transformer circuit (195) in operation S901. For example, the image display device (100) can calculate the switching frequency corresponding to the PFM method based on the load corresponding to the brightness of the image output through the display (180), the mode for the brightness of the screen (hereinafter, screen mode), etc. At this time, the duty ratio of the pulse corresponding to the PFM method can be set to a preset duty ratio (e.g., 50%). Meanwhile, the image display device (100) can continuously calculate the switching frequency corresponding to the PFM method while the screen is output through the display (180).

[0216] The image display device (100) can determine, in operation S902, whether the switching frequency is less than a preset maximum frequency (fmax). Here, the maximum frequency may be a frequency set in relation to regulations on conducted emissions (CE). For example, the image display device (100) can determine whether the switching frequency corresponding to the PFM method is equal to or greater than 150 kHz, which is preset as the maximum frequency.

[0217] The image display device (100) can control the operation of the transformer circuit (195) according to the PFM method when the switching frequency is lower than the preset maximum frequency (fmax) in operation S903. For example, when the load increases in response to an increase in the brightness of the image output through the display (180), the image display device (100) can reduce the switching frequency in response to the increase in the load. For example, when a user increases the brightness level of the screen, the image display device (100) can reduce the switching frequency so that the set value of the output voltage increases in response to the increase in the brightness level of the screen. For example, when the screen mode is changed from a first mode that outputs the screen brightly to a second mode that outputs the screen darkly, the image display device (100) can increase the switching frequency in response to a decrease in the brightness of the screen. In the following, the setting value of the output voltage corresponding to the first mode is 24 V, the setting value of the output voltage corresponding to the second mode is 21 V, and the setting value of the output voltage corresponding to the third mode is 18 V.

[0218] The image display device (100) can determine whether the load is reduced in operation S904. For example, if the brightness of the image output through the display (`180) is reduced, the load of the image display device (100) can be reduced.

[0219] The video display device (100) can determine, in operation S905, whether a set value for the output voltage decreases. For example, when the screen mode of the video display device (100) is set to the first mode and the screen mode is changed to the second mode or the third mode, the set value for the output voltage may decrease.

[0220] The video display device (100) can determine whether the power is turned off in operation S906. The video display device (100) can control the operation of the transformer circuit (195) according to the PFM method until the power is turned off, while the switching frequency is lower than the preset maximum frequency (fmax).

[0221] Meanwhile, the video display device (100) can monitor whether the switching frequency is higher than the preset maximum frequency (fmax) when the load decreases and / or the set value for the output voltage decreases.

[0222] Meanwhile, referring to FIG. 9b, the image display device (100) can control the operation of the transformer circuit (195) according to the phase shift method when the switching frequency is higher than the preset maximum frequency (fmax) in operation S907. At this time, the switching frequency corresponding to the phase shift method can be set to a predetermined frequency. Here, the predetermined frequency can be lower than or equal to the preset maximum frequency (fmax). For example, the predetermined frequency can be the maximum value (e.g., 150 kHz) among the frequencies that satisfy the requirements related to conducted emission (CE).

[0223] When the operation of the transformer circuit (195) is controlled according to the phase shift method, a state in which one of the two pairs of upper-arm switching elements included in the first switching unit (810) of the transformer circuit (195) is turned on, the other lower-arm switching element is turned on, and the rest are turned off (hereinafter, a first state), and a state in which all upper-arm switching elements included in the first switching unit (810) are turned on, all lower-arm switching elements are turned off, or all upper-arm switching elements are turned off, and all lower-arm switching elements are turned on (hereinafter, a second state) may be periodically repeated. At this time, the first state and the second state may be repeated twice in one cycle. Meanwhile, the duty ratio of the pulse for each of the plurality of switching elements (Q1, Q2, Q3, Q4) included in the first switching unit (810) may be 50%.

[0224] The image display device (100) can determine the time (hereinafter, PS time) for which the first state is maintained in one cycle. The image display device (100) can adjust the PS time by varying (transitioning) the phase of the pulse for a plurality of switching elements (Q1, Q2, Q3, Q4). The image display device (100) can determine a phase angle corresponding to the degree to which the phase of the pulse transmitted to the switching elements (Q1, Q2, Q3, Q4) varies (transitions). At this time, the image display device (100) can adjust the PS time based on the phase angle. That is, the PS time can correspond to the phase angle. Here, the PS time can correspond to a duty value that is the sum of the effective duty and the duty loss. In the present disclosure, an example in which the duty loss is 0 will be described.

[0225] The image display device (100) can determine the PS time (D) based on the load, screen mode, etc. corresponding to the brightness of the image output through the display (180). For example, when the load increases in response to an increase in the brightness of the image output through the display (180), the image display device (100) can increase the PS time (D) in response to the increase in the load. For example, when a user decreases the brightness level of the screen, the image display device (100) can decrease the PS time (D) so that the set value of the output voltage decreases in response to the decrease in the brightness level of the screen. For example, when the screen mode is changed from the second mode to the third mode, the image display device (100) can decrease the PS time (D) in response to the decrease in the brightness of the screen.

[0226] The image display device (100) can determine whether the load increases in operation S908. For example, if the brightness of the image output through the display (180) increases, the load of the image display device (100) may increase.

[0227] The video display device (100) can determine, in operation S909, whether a set value for the output voltage increases. For example, when the screen mode of the video display device (100) is set to the third mode and the screen mode is changed to the first mode or the second mode, the set value for the output voltage may increase.

[0228] The video display device (100) can determine, in operation S910, whether the ratio of the PS time (D) to the cycle corresponding to a predetermined frequency is less than a predetermined ratio when the load increases and / or the set value for the output voltage increases. Here, the predetermined ratio may be 50% or less. In the present disclosure, the predetermined ratio of 50% will be described as an example.

[0229] The video display device (100) can determine whether the power is turned off in operation S906. The video display device (100) can control the operation of the transformer circuit (195) according to the phase shift method until the power is turned off when the PS time (D) is less than 50% of one cycle.

[0230] Meanwhile, the image display device (100) can determine whether the switching frequency corresponding to the PFM method is less than the preset maximum frequency (fmax) when the PS time (D) corresponds to 50% of one cycle. At this time, when the switching frequency is less than the preset maximum frequency (fmax) due to an increase in the load and / or an increase in the set value for the output voltage, the operation of the transformer circuit (195) can be controlled according to the PFM method.

[0231] Referring to FIG. 10, the image display device (100) according to embodiments of the present disclosure can control the operation of the transformer circuit (195) according to the PFM method when the switching frequency corresponding to the PFM method is lower than the preset maximum frequency (fmax). At this time, the duty ratio of the pulse corresponding to the PFM method is fixed to the preset duty ratio (e.g., 50%), and the switching frequency can be adjusted. For example, the switching frequency can be adjusted between the minimum frequency (fo) and the maximum frequency (fmax), which are frequency ranges according to the PFM method.

[0232] Meanwhile, the image display device (100) can control the operation of the transformer circuit (195) according to the phase shift method when the switching frequency corresponding to the PFM method is higher than the preset maximum frequency (fmax). At this time, the switching frequency corresponding to the phase shift method is fixed to a predetermined frequency (e.g., 150 kHz), and the PS time (D) can be adjusted. In addition, the voltage gain can be adjusted as the PS time (D) is varied while the switching frequency is fixed to the maximum frequency (fmax).

[0233] Referring to FIGS. 11 and 12, when the screen mode is set to a predetermined mode, the method of controlling the operation of the transformer circuit (195) may be changed according to a decrease in the load of the image display device (100). At this time, when the screen mode is set to a predetermined mode, the set value of the output voltage may be maintained.

[0234] The image display device (100) can control the operation of the transformer circuit (195) so that the output current (1110) decreases in response to a decrease in load. At this time, the image display device (100) can change the method of controlling the operation of the transformer circuit (195) from the PFM method to the phase shift method when the switching frequency corresponding to the PFM method increases above the maximum frequency (fmax) in response to a decrease in load.

[0235] In a section (1101) where the load of the image display device (100) is above a certain level, the image display device (100) can control the operation of the transformer circuit (195) according to the PFM method. At this time, since the operation of the transformer circuit (195) is controlled based on the switching frequency corresponding to the load, the primary voltage (1130) can have a duty ratio of 50% and can appear as a high-frequency pulse corresponding to the switching frequency. In addition, the primary current (1140) can appear as a sine wave corresponding to the primary voltage (1130).

[0236] In a transient section (1102) where the method of controlling the operation of the transformer circuit (195) changes from the PFM method to the phase shift method, the image display device (100) can control the operation of the transformer circuit (195) according to the phase shift method. At this time, the switching frequency can be fixed to a predetermined frequency (e.g., 150 kHz). Meanwhile, in the transient section (1102), the PS time (D) can be gradually reduced to correspond to the load of the image display device (100) at less than 50% of one cycle.

[0237] Meanwhile, in a section (1103) where the load of the image display device (100) is below a certain level, the image display device (100) can control the operation of the transformer circuit (195) according to a phase shift method. At this time, as the phase of the pulse for the plurality of switching elements (Q1, Q2, Q3, Q4) is varied (shifted) based on the phase angle corresponding to the load, the primary voltage (1130) can appear as a pulse including a zero-voltage section.

[0238] Referring to FIGS. 13 and 14, when an image of a predetermined brightness is output through the display (180), the method of controlling the operation of the transformer circuit (195) may be changed as the screen mode is changed or the brightness level of the screen is reduced by the user.

[0239] The image display device (100) can control the operation of the transformer circuit (195) so that the output voltage (1320) decreases in response to a decrease in the brightness level of the screen. At this time, the image display device (100) can change the method of controlling the operation of the transformer circuit (195) from the PFM method to the phase shift method when the switching frequency corresponding to the PFM method increases above the maximum frequency (fmax) in response to a decrease in the brightness level of the screen.

[0240] In a section (1301) where the screen mode of the image display device (100) is set to the second mode, the image display device (100) can control the operation of the transformer circuit (195) according to the PFM method. At this time, since the operation of the transformer circuit (195) is controlled based on a switching frequency corresponding to the brightness level of the screen, the primary voltage (1330) may have a duty ratio of 50% and may appear as a high-frequency pulse corresponding to the switching frequency. In addition, the primary current (1340) may appear as a sine wave corresponding to the primary voltage (1330).

[0241] Meanwhile, in a section (1302) where the screen mode of the image display device (100) is set to the third mode, the image display device (100) can control the operation of the transformer circuit (195) according to the phase shift method. At this time, as the phase of the pulse for the plurality of switching elements (Q1, Q2, Q3, Q4) is varied (shifted) based on the phase angle corresponding to the load, the primary voltage (1330) can appear as a pulse including a zero voltage section.

[0242] Meanwhile, even though the output current (1310) corresponding to the load is greater in the section (1302) where the screen mode of the image display device (100) is set to the third mode compared to the section (1301) where the screen mode is set to the second mode, when the switching frequency corresponding to the PFM method increases above the maximum frequency (fmax) in response to a decrease in the brightness level of the screen, the operation of the transformer circuit (195) can be controlled according to the phase shift method.

[0243] Hereinafter, directions are defined based on the rectangular coordinate system. In the rectangular coordinate system, the x-axis direction can be defined as the left-right direction. At this time, the direction toward +x with respect to the origin can mean the right direction, and the direction toward -x can mean the left direction. In addition, the y-axis direction can be defined as the front-back direction. At this time, the direction toward +y with respect to the origin can mean the front direction, and the direction toward -y can mean the rear direction. In addition, the z-axis direction can be defined as the up-down direction. At this time, the direction toward +z with respect to the origin can mean the upward direction, and the direction toward -z can mean the downward direction.

[0244] Figure 15 is an exploded perspective view of a transformer according to embodiments of the present disclosure.

[0245] Referring to FIG. 15, the transformer (820) may include a first core (1510), a second core (1520), a first bobbin (1530), a second bobbin (1540), a first coupling member (1550), and / or a second coupling member (1560).

[0246] The first core (1510) and the second core (1520) can serve as a conductor through which magnetic flux is transmitted. The first core (1510) and the second core (1520) can include a magnetic material such as iron or ferrite, but are not limited thereto. In the present disclosure, the first core (1510) and the second core (1520) are described as being configured in a shape symmetrical to each other, but are not limited thereto.

[0247] The first core (1510) may include a first core body (1511). The first core (1510) may include a first right outer leg (1513) extending downward from a right end of the first core body (1511) and / or a first left outer leg (1515) extending downward from a left end of the first core body (1511).

[0248] The second core (1520) may include a second core body (1521). The second core (1520) may include a second left outer leg (1523) extending upward from a left end of the second core body (1521) and / or a second right outer leg (1525) extending upward from a right end of the second core body (1521). When the first core (1510) and the second core (1520) are coupled, the left outer leg pair (1515, 1523) and the right outer leg pair (1513, 1525) may be in contact with each other.

[0249] The first bobbin (1530) and the second bobbin (1530) may be composed of an insulating resin, but are not limited thereto.

[0250] The first bobbin (1530) may include a first upper bobbin portion (1531) and a first lower bobbin portion (1532). A first connecting portion (1533) may be formed between the first upper bobbin portion (1531) and the first lower bobbin portion (1532). The first connecting portion (1533) may form a first insertion space (1533) into which the left outer pair of legs (1515, 1523) is inserted. The first connecting portion (1533) may include an inner wall surrounding the left outer pair of legs (1515, 1523).

[0251] The first bobbin (1530) may include a plurality of fixed ribs (1534). The plurality of fixed ribs (1534) may have a shape that protrudes outwardly from the first bobbin (1530). The plurality of fixed ribs (1534) may be formed at a front end of the first upper bobbin portion (1531), a rear end of the first upper bobbin portion (1531), a front end of the first lower bobbin portion (1532), and / or a rear end of the first lower bobbin portion (1532).

[0252] The second bobbin (1540) may include a second upper bobbin portion (1541) and a second lower bobbin portion (1542). A second connecting portion (1543) may be formed between the second upper bobbin portion (1541) and the second lower bobbin portion (1542). The second connecting portion (1543) may form a second insertion space (1543) into which the right outer pair of legs (1513, 1525) is inserted. The second connecting portion (1543) may include an inner wall surrounding the right outer pair of legs (1513, 1525).

[0253] The second bobbin (1540) may include a plurality of fixed ribs (1544). The plurality of fixed ribs (1544) may have a shape that protrudes outwardly from the second bobbin (1540). The plurality of fixed ribs (1544) may be formed at a front end of the second upper bobbin portion (1541), a rear end of the second upper bobbin portion (1541), a front end of the second lower bobbin portion (1542), and / or a rear end of the second lower bobbin portion (1542).

[0254] Each of the primary coil and the secondary coil may be configured with a structure in which the conductive wire is wound several times to form multiple windings. Each of the primary coil and the secondary coil may be wound in a single layer or multiple layers. The primary coil and the secondary coil may be configured with Litz wire, but are not limited thereto.

[0255] The primary coil may be wound around the first connecting portion (1533). For example, the primary coil may be arranged to wrap around the outer wall of the first connecting portion (1533). The primary coil may be wound in a donut shape. The secondary coil may be wound around the second connecting portion (1543). For example, the secondary coil may be arranged to wrap around the outer wall of the second connecting portion (1543). The secondary coil may be wound in a donut shape.

[0256] The first connecting member (1550) may include a first support member (1551), a first upper fixing member (1552) formed to extend in the forward direction from the upper end of the first support member (1551), and / or a first lower fixing member (1553) formed to extend in the forward direction from the lower end of the first support member (1551).

[0257] The first connecting member (1550) may include a plurality of first upper rib grooves (1554) formed in the first upper fixing portion (1552) and / or a plurality of first lower rib grooves (1555) formed in the first lower fixing portion (1553). The shapes of the first upper rib grooves (1554) and the first lower rib grooves (1555) may correspond to the shapes of the fixing ribs (1543, 1544). For example, the fixing rib (1534) formed in the rear end of the first upper bobbin portion (1531) may be inserted into one of the plurality of first upper rib grooves (1554), and the fixing rib (1544) formed in the rear end of the second upper bobbin portion (1541) may be inserted into another one of the plurality of first upper rib grooves (1554).

[0258] The second connecting member (1560) may include a second support member (1561), a second upper fixing member (1562) formed to extend in the rearward direction from the upper end of the second support member (1561), and / or a second lower fixing member (1563) formed to extend in the rearward direction from the lower end of the second support member (1561).

[0259] The second connecting member (1560) may include a plurality of second upper rib grooves (1564) formed in the second upper fixing portion (1562) and / or a plurality of second lower rib grooves (1565) formed in the second lower fixing portion (1563). The shapes of the second upper rib grooves (1564) and the second lower rib grooves (1565) may correspond to the shapes of the fixing ribs (1543, 1544). For example, the fixing rib (1534) formed in the front end of the first upper bobbin portion (1531) may be inserted into one of the plurality of second upper rib grooves (1564), and the fixing rib (1544) formed in the front end of the second upper bobbin portion (1541) may be inserted into another one of the plurality of second upper rib grooves (1564).

[0260] Meanwhile, depending on the performance of the image display device (100), for example, the range of voltage values ​​that can be set for the output voltage, the mutual inductance, turns ratio, etc. of the transformer (820) may vary. At this time, according to the embodiments of the present disclosure, the positions of the rib grooves (1554, 1555, 1564, 1565) into which the fixed ribs (1543, 1544) are inserted may be determined depending on the mutual inductance, turns ratio, etc. of the transformer (820). In addition, the sizes of the first core (1510) and the second core (1520) may be determined depending on the positions of the rib grooves (1554, 1555, 1564, 1565) into which the fixed ribs (1543, 1544) are inserted. Accordingly, a transformer (820) optimized for various performances of the image display device (100) can be provided in the image display device (100).

[0261] As described above, according to at least one embodiment of the present disclosure, the method of controlling the switching elements (Q1, Q2, Q3, Q4) can be changed according to the frequency band of the switching frequency in accordance with the change in the load, thereby limiting an excessive increase in the switching frequency.

[0262] In addition, according to at least one embodiment of the present disclosure, the method of controlling the switching elements (Q1, Q2, Q3, Q4) can be changed according to the frequency band of the switching frequency depending on the magnitude of the output voltage, thereby limiting an excessive increase in the switching frequency.

[0263] In addition, according to at least one embodiment of the present disclosure, electromagnetic compatibility (EMC) can be improved without providing an additional EMI filter, thereby preventing an increase in the size of the power supply unit (190) and an increase in production cost.

[0264] Additionally, according to at least one embodiment of the present disclosure, a transformer (820) optimized for various methods of controlling switching elements (Q1, Q2, Q3, Q4) may be provided.

[0265] Referring to FIGS. 1 to 15, an image display device (100) according to one aspect of the present disclosure includes a display (180); a power supply unit (190) that supplies driving power to the display (180); And a control unit (170), and the power supply unit (190) includes a full-bridge converter (195) including a plurality of switching elements (Q1, Q2, Q3, Q4), and the control unit (170) calculates a first switching frequency corresponding to a PFM (Pulse Frequency Modulation) method, and when the first switching frequency is lower than a preset maximum frequency, controls the plurality of switching elements (Q1, Q2, Q3, Q4) based on the first switching frequency according to the PFM method, and when the first switching frequency is higher than the maximum frequency, controls the plurality of switching elements (Q1, Q2, Q3, Q4) based on a second switching frequency according to a phase shift method.

[0266] Additionally, according to one aspect of the present disclosure, the second switching frequency may be preset to the maximum frequency while the plurality of switching elements (Q1, Q2, Q3, Q4) are controlled according to the phase shift method.

[0267] Additionally, according to one aspect of the present disclosure, the maximum frequency may be preset in relation to regulations on conducted emissions (CE).

[0268] In addition, according to one aspect of the present disclosure, the control unit (170) can calculate the first switching frequency based on at least one of a load corresponding to the brightness of an image output through the display (180) and a brightness level of the screen.

[0269] In addition, according to one aspect of the present disclosure, the control unit (170), in a state of controlling the plurality of switching elements (Q1, Q2, Q3, Q4) according to the phase shift method, determines a phase angle corresponding to the degree to which the phase of a signal transmitted to each of the plurality of switching elements (Q1, Q2, Q3, Q4) is shifted based on at least one of a load corresponding to the brightness of an image output through the display (180) and a brightness level of the screen, and outputs the signal to the plurality of switching elements (Q1, Q2, Q3, Q4) based on the determined phase angle.

[0270] In addition, according to one aspect of the present disclosure, the full bridge converter (195) includes a first upper-arm switching element and a first lower-arm switching element forming a pair, and a second upper-arm switching element and a second lower-arm switching element forming a pair, and the control unit (170) compares the first switching frequency with the maximum frequency when a ratio of a second time corresponding to the phase angle to a first time, which is a period corresponding to the second switching frequency, is equal to or greater than a predetermined ratio, and the second time may correspond to a time at which the first upper-arm switching element and the second lower-arm switching element are turned on and the second upper-arm switching element and the first lower-arm switching element are turned off.

[0271] Additionally, according to one aspect of the present disclosure, the predetermined ratio may be 50% or less.

[0272] Additionally, according to one aspect of the present disclosure, the control unit (170) can calculate a ratio of the second time to the first time when at least one of the cases in which the load increases and the cases in which the brightness level increases occurs.

[0273] In addition, according to one aspect of the present disclosure, the full bridge converter (195) may be a synchronous rectifier type series resonant converter.

[0274] An operating method of an image display device (100) including a display (180) and a full-bridge converter (195) according to one aspect of the present disclosure may include: an operation of calculating a first switching frequency corresponding to a PFM (Pulse Frequency Modulation) method; an operation of controlling a plurality of switching elements (Q1, Q2, Q3, Q4) included in the full-bridge converter (195) based on the first switching frequency according to the PFM method when the first switching frequency is less than a preset maximum frequency; and an operation of controlling the plurality of switching elements (Q1, Q2, Q3, Q4) based on a second switching frequency according to a phase shift method when the first switching frequency is equal to or greater than the maximum frequency.

[0275] The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present disclosure.

[0276] Meanwhile, the operating method of the present disclosure can be implemented as processor-readable code on a processor-readable recording medium. A processor-readable recording medium includes all types of recording devices that store data that can be read by a processor. Examples of processor-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage devices, etc., and also include those implemented in the form of a carrier wave, such as transmission via the Internet. Furthermore, the processor-readable recording medium can be distributed across network-connected computer systems, so that the processor-readable code can be stored and executed in a distributed manner.

[0277] In addition, although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. Display; A power supply unit for supplying driving power to the above display; and Including a control unit, The above power supply unit includes a full-bridge converter including a plurality of switching elements, The above control unit, Calculate the first switching frequency corresponding to the PFM (Pulse Frequency Modulation) method, When the first switching frequency is less than the preset maximum frequency, the plurality of switching elements are controlled based on the first switching frequency according to the PFM method, An image display device characterized in that, when the first switching frequency is greater than or equal to the maximum frequency, the plurality of switching elements are controlled based on a second switching frequency according to a phase shift method.

2. In paragraph 1, An image display device, characterized in that the second switching frequency is preset to the maximum frequency while the plurality of switching elements are controlled according to the phase shift method.

3. In paragraph 1, A display device characterized in that the above maximum frequency is preset in relation to regulations on conducted emissions (CE).

4. In paragraph 1, The above control unit, An image display device characterized in that the first switching frequency is calculated based on at least one of a load corresponding to the brightness of an image output through the display and a brightness level of the screen.

5. In paragraph 1, The above control unit controls the plurality of switching elements according to the phase shift method, Based on at least one of a load corresponding to the brightness of an image output through the display and a brightness level of the screen, a phase angle corresponding to the degree of phase shift of a signal transmitted to each of the plurality of switching elements is determined, An image display device characterized in that the signal is output to the plurality of switching elements based on the determined phase angle.

6. In paragraph 5, The above full bridge converter comprises a pair of first upper-arm switching elements and a first lower-arm switching element, and a pair of second upper-arm switching elements and a second lower-arm switching element, The above control unit, If the ratio of the second time corresponding to the phase angle to the first time corresponding to the second switching frequency is greater than or equal to a predetermined ratio, the first switching frequency and the maximum frequency are compared, An image display device, characterized in that the second time corresponds to a time at which the first upper-arm switching element and the second lower-arm switching element are turned on and the second upper-arm switching element and the first lower-arm switching element are turned off.

7. In paragraph 6, An image display device, characterized in that the above-mentioned predetermined ratio is 50% or less.

8. In paragraph 6, The above control unit, A display device characterized in that the ratio of the second time to the first time is calculated when at least one of the above load increases and the above brightness level increases.

9. In paragraph 1, An image display device, characterized in that the above full bridge converter is a synchronous rectifier type series resonant converter.

10. In the operating method of a video display device including a full-bridge converter, An operation for calculating a first switching frequency corresponding to the PFM (Pulse Frequency Modulation) method; When the first switching frequency is less than the preset maximum frequency, an operation of controlling a plurality of switching elements included in the full bridge converter based on the first switching frequency according to the PFM method; and An operating method of an image display device, comprising an operation of controlling the plurality of switching elements based on a second switching frequency according to a phase shift method when the first switching frequency is equal to or greater than the maximum frequency.

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