Image display device

Abstract

The present disclosure relates to an image display device. An image display device according to an embodiment of the present disclosure comprises: a wireless power transmission device that wirelessly transmits power; a wireless power reception device that receives wireless power from the wireless power transmission device; a dc / dc converter that converts a first direct-current voltage from the wireless power reception device to output a display driving voltage; a control unit that controls the dc / dc converter; and a display that operates on the basis of the display driving voltage. The dc / dc converter includes a first switching element and a second switching element connected in series with each other in a first leg, and a third switching element and a fourth switching element connected in series with each other in a second leg, which is connected in parallel with the first leg. The control unit, when operating in a phase shift mode, allows turn-on periods of the first switching element and the fourth switching element to partially overlap, and in accordance with a level of the first direct-current voltage, varies an overlap period when the first switching element and the fourth switching element are turned on. Accordingly, an image can be stably displayed on the basis of wireless power transmission.

Description

Video display device

[0001] The present disclosure relates to an image display device, and more specifically, to an image display device capable of stably displaying an image based on wireless power transmission.

[0002] A video display device is a device that displays images.

[0003] In response to recent demands for increased image resolution and image clarity, it is a cone in which the display resolution or peak brightness of the display within the image display device increases.

[0004] Meanwhile, as the size of the display panel, display resolution, or peak brightness increases, the power consumption supplied to the display increases.

[0005] Meanwhile, research on wireless power transmission is being attempted to improve mobility in video display devices such as TVs.

[0006] The problem to be solved by the present disclosure is to provide an image display device capable of stably displaying an image based on wireless power transmission.

[0007] Another problem to be solved by the present disclosure is to provide an image display device capable of stably displaying an image in response to fluctuations in DC voltage received from a wireless power receiving device.

[0008] An image display device according to one embodiment of the present disclosure for solving the above problem comprises a wireless power transmission device that transmits power wirelessly, a wireless power receiving device that receives wireless power from the wireless power transmission device, a DC / DC converter that converts a first DC voltage from the wireless power receiving device and outputs a display driving voltage, a control unit that controls the DC / DC converter, and a display that operates based on the display driving voltage. The DC / DC converter comprises a first switching element and a second switching element connected in series within a first leg, and a third switching element and a fourth switching element connected in series within a second leg connected in parallel with the first leg. The control unit overlaps a portion of the turn-on period of the first switching element and the fourth switching element during phase shift mode operation, and varies the overlap period of the turn-on of the first switching element and the fourth switching element according to the level of the first DC voltage.

[0009] Meanwhile, the control unit can control the first switching element and the second switching element to switch complementarily, and the third switching element and the fourth switching element to switch complementarily.

[0010] Meanwhile, the control unit controls the first DC voltage to be at a first level so that the overlap period when the first switching element and the fourth switching element turn on becomes a first period, and when the first DC voltage is at a second level greater than the first level, it controls the first switching element and the fourth switching element to be at a second period smaller than the first period.

[0011] Meanwhile, the control unit can increase the overlap period when the first switching element and the fourth switching element turn on as the level of the first DC voltage decreases during phase shift mode operation.

[0012] Meanwhile, the control unit controls the overlap period when the first switching element and the fourth switching element turn on to be the third period when the level of the display driving voltage is the third level, and controls the overlap period when the first switching element and the fourth switching element turn on to be the fourth period when the level of the display driving voltage is the fourth level which is greater than the third level.

[0013] Meanwhile, the control unit can increase the overlap period of the first switching element and the fourth switching element when they turn on as the level of the display driving voltage increases.

[0014] Meanwhile, the control unit controls the overlapping period of the first switching element and the fourth switching element when turned on when the distance between the wireless power transmission device and the wireless power transmission device is a first distance, and controls the overlapping period of the first switching element and the fourth switching element when turned on when the distance between the wireless power transmission device and the wireless power transmission device is a second distance, which is farther than the first distance, to be a sixth period greater than the fifth period.

[0015] Meanwhile, the control unit can increase the overlap period of the first switching element and the fourth switching element when turning on as the distance between the wireless power transmission device and the wireless power transmission device increases.

[0016] Meanwhile, the control unit can control the operation to be in phase shift mode when the level of the first DC voltage is above a reference level, and control the turn-on period of the first switching element and the fourth switching element to overlap when the level of the first DC voltage is below the reference level.

[0017] Meanwhile, the control unit can vary the switching frequency of the first to fourth switching elements, control the switching frequency to operate in a phase shift mode when the switching frequency is greater than or equal to the reference frequency, and control the switching frequency to ensure that the turn-on periods of the first switching element and the fourth switching element overlap when the switching frequency is less than the reference frequency.

[0018] Meanwhile, the control unit can control the reference frequency to increase as the level of the display driving voltage decreases.

[0019] Meanwhile, the control unit can vary the switching frequency of the first to fourth switching elements within a first range, and control them to operate in a phase shift mode when the switching frequency is greater than or equal to a reference frequency within the first range.

[0020] Meanwhile, the control unit can control the first to fourth switching elements to perform zero-voltage switching, and control the first to fourth switching elements to operate in a phase shift mode while performing zero-voltage switching.

[0021] Meanwhile, the control unit can control the first to fourth switching elements to perform zero-voltage switching, and based on the zero-voltage switching, control the wireless power transmitted from the wireless power transmission device to be variable.

[0022] Meanwhile, the control unit can control the power to be turned off when the level of the first DC voltage is below the lower limit level or exceeds the upper limit level.

[0023] Meanwhile, an image display device according to one embodiment of the present disclosure further includes a signal processing device that outputs an image signal to a display, and a control unit outputs a first display driving voltage when the image output mode of the signal processing device is an eco mode or a standard mode, and outputs a second display driving voltage higher than the first display driving voltage when the image output mode of the signal processing device is a movie mode or a game mode.

[0024] Meanwhile, the control unit can output a third display driving voltage higher than the second display driving voltage when the image output mode of the signal processing device is a high dynamic range mode.

[0025] Meanwhile, the wireless power transmission device forms a magnetic field for wireless power to the wireless power receiving device and can control the magnetic field strength to be greater in the side areas than in the central area.

[0026] Meanwhile, the DC / DC converter may further include a transformer whose input terminal is connected to the output terminal of a plurality of switching elements, and a rectifier disposed at the output terminal of the transformer.

[0027] Meanwhile, the DC / DC converter may further include a multi-level voltage output circuit connected to the output terminal of the rectifier and outputting a plurality of display driving voltages according to a plurality of display modes.

[0028] A video display device according to another embodiment of the present disclosure comprises a wireless power transmission device that transmits power wirelessly, a wireless power receiving device that receives wireless power from the wireless power transmission device, a DC / DC converter having a plurality of switching elements and converting a first DC voltage from the wireless power receiving device to output a display driving voltage, a control unit that controls the DC / DC converter, and a display that operates based on the display driving voltage. The control unit performs a phase shift mode in response to fluctuations in the first DC voltage, and when the phase shift mode is operated, varies the overlap period of some of the switching elements among the plurality of switching elements when turned on according to the level of the first DC voltage.

[0029] An image display device according to one embodiment of the present disclosure comprises a wireless power transmission device that transmits power wirelessly, a wireless power receiving device that receives wireless power from the wireless power transmission device, a DC / DC converter that converts a first DC voltage from the wireless power receiving device and outputs a display driving voltage, a control unit that controls the DC / DC converter, and a display that operates based on the display driving voltage. The DC / DC converter comprises a first switching element and a second switching element connected in series within a first leg, and a third switching element and a fourth switching element connected in series within a second leg connected in parallel with the first leg. The control unit overlaps a portion of the turn-on period of the first switching element and the fourth switching element during phase shift mode operation, and varies the overlap period of the turn-on of the first switching element and the fourth switching element according to the level of the first DC voltage. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the DC voltage received by the wireless power receiving device.

[0030] Meanwhile, the control unit can control the first switching element and the second switching element to switch complementarily, and the third switching element and the fourth switching element to switch complementarily. Accordingly, it becomes possible to stably display an image based on wireless power transmission.

[0031] Meanwhile, the control unit controls the first DC voltage to be at a first level so that the overlap period when the first switching element and the fourth switching element turn on becomes a first period, and controls the first DC voltage to be at a second level greater than the first level so that the overlap period when the first switching element and the fourth switching element turn on becomes a second period smaller than the first period. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the first DC voltage.

[0032] Meanwhile, the control unit can increase the overlap period between the turn-on of the first switching element and the fourth switching element as the level of the first DC voltage decreases during phase shift mode operation. Accordingly, it becomes possible to stably display an image based on wireless power transmission. In particular, it becomes possible to stably display an image in response to fluctuations in the first DC voltage.

[0033] Meanwhile, the control unit controls the overlapping period of the first switching element and the fourth switching element when they turn on when the level of the display driving voltage is at the third level to be the third period, and controls the overlapping period of the first switching element and the fourth switching element when they turn on when the level of the display driving voltage is at the fourth level, which is greater than the third level to be the fourth period, which is greater than the third period. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the level of the display driving voltage.

[0034] Meanwhile, the control unit can increase the overlap period of the first switching element and the fourth switching element when they turn on as the level of the display driving voltage increases. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the level of the display driving voltage.

[0035] Meanwhile, the control unit controls the overlapping period of the first switching element and the fourth switching element when they turn on when the distance between the wireless power transmission device and the wireless power transmission device is a first distance, so that the overlapping period is a fifth period, and controls the overlapping period of the first switching element and the fourth switching element when they turn on when the distance between the wireless power transmission device and the wireless power transmission device is a second distance, which is farther than the first distance, so that the overlapping period is a sixth period, which is greater than the fifth period. Accordingly, it becomes possible to stably display an image based on wireless power transmission. In particular, it becomes possible to stably display an image in response to variations in the distance between the wireless power transmission device and the wireless power transmission device.

[0036] Meanwhile, the control unit can increase the overlap period of the first switching element and the fourth switching element when turning on as the distance between the wireless power transmission device and the wireless power transmission device increases. Accordingly, it becomes possible to stably display an image based on wireless power transmission. In particular, it becomes possible to stably display an image in response to variations in the distance between the wireless power transmission device and the wireless power transmission device.

[0037] Meanwhile, the control unit can control the operation to be in phase shift mode when the level of the first DC voltage is above a reference level, and control the turn-on periods of the first switching element and the fourth switching element to overlap when the level of the first DC voltage is below the reference level. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the level of the first DC voltage.

[0038] Meanwhile, the control unit can vary the switching frequency of the first to fourth switching elements, control the operation to be in phase shift mode when the switching frequency is greater than or equal to the reference frequency, and control the operation so that the turn-on periods of the first switching element and the fourth switching element overlap when the switching frequency is less than the reference frequency. Accordingly, it is possible to stably display an image based on wireless power transmission.

[0039] Meanwhile, the control unit can control the reference frequency to increase as the level of the display driving voltage decreases. Accordingly, it becomes possible to stably display images based on wireless power transmission. In particular, it becomes possible to stably display images in response to fluctuations in the level of the display driving voltage.

[0040] Meanwhile, the control unit can vary the switching frequency of the first to fourth switching elements within a first range, and control them to operate in a phase shift mode when the switching frequency is greater than or equal to a reference frequency within the first range. Accordingly, it is possible to stably display an image based on wireless power transmission.

[0041] Meanwhile, the control unit can control the first to fourth switching elements to perform zero-voltage switching, and control the first to fourth switching elements to operate in a phase shift mode while performing zero-voltage switching. Accordingly, it is possible to stably display an image based on wireless power transmission.

[0042] Meanwhile, the control unit controls the first to fourth switching elements to perform zero-voltage switching, and based on the zero-voltage switching, can control the wireless power transmitted from the wireless power transmission device to be variable. Accordingly, it becomes possible to stably display an image based on wireless power transmission.

[0043] Meanwhile, the control unit can control the power to be turned off when the level of the first DC voltage is below a lower limit level or exceeds an upper limit level. Accordingly, it is possible to stably display an image based on wireless power transmission.

[0044] Meanwhile, an image display device according to one embodiment of the present disclosure further includes a signal processing device that outputs an image signal to a display, and a control unit outputs a first display driving voltage when the image output mode of the signal processing device is an eco mode or a standard mode, and outputs a second display driving voltage higher than the first display driving voltage when the image output mode of the signal processing device is a movie mode or a game mode. Accordingly, an image can be displayed stably based on wireless power transmission. In particular, an image can be displayed stably in response to fluctuations in the level of the display driving voltage.

[0045] Meanwhile, the control unit can output a third display driving voltage higher than the second display driving voltage when the image output mode of the signal processing device is the high dynamic range mode. Accordingly, it becomes possible to stably display an image based on wireless power transmission. In particular, it becomes possible to stably display an image in response to fluctuations in the level of the display driving voltage.

[0046] Meanwhile, the wireless power transmission device forms a magnetic field for wireless power to the wireless power receiving device and can control the magnetic field strength so that it is greater in the side areas than in the central area. Accordingly, it becomes possible to stably display images based on wireless power transmission.

[0047] Meanwhile, the DC / DC converter may further include a transformer whose input terminal is connected to the output terminal of a plurality of switching elements, and a rectifier disposed at the output terminal of the transformer. Accordingly, it becomes possible to stably display images based on wireless power transmission.

[0048] Meanwhile, the DC / DC converter may further include a multi-level voltage output circuit connected to the output terminal of the rectifier and outputting multiple display driving voltages according to multiple display modes. Accordingly, it becomes possible to stably display images based on wireless power transmission. In particular, it becomes possible to stably display images in response to fluctuations in the level of the display driving voltage.

[0049] An image display device according to another embodiment of the present disclosure comprises a wireless power transmission device that transmits power wirelessly, a wireless power receiving device that receives wireless power from the wireless power transmission device, a DC / DC converter having a plurality of switching elements and converting a first DC voltage from the wireless power receiving device to output a display driving voltage, a control unit that controls the DC / DC converter, and a display that operates based on the display driving voltage. The control unit performs a phase shift mode in response to fluctuations in the first DC voltage, and when operating the phase shift mode, varies the overlap period of turn-on of some of the switching elements among the plurality of switching elements according to the level of the first DC voltage. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the DC voltage received by the wireless power receiving device.

[0050] FIG. 1 is a drawing illustrating an image display device according to one embodiment of the present disclosure.

[0051] Figure 2 is an example of an internal block diagram of the image display device of Figure 1.

[0052] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0053] FIG. 4a is a diagram illustrating a control method of the remote control device of FIG. 2.

[0054] Figure 4b is an internal block diagram of the remote control device of Figure 2.

[0055] Figure 5 is an example of an internal block diagram of the display of Figure 2.

[0056] FIGS. 6a and 6b are drawings referenced in the description of the organic light-emitting panel of FIG. 5.

[0057] FIG. 7 is an example of an internal block diagram of an image display device according to an embodiment of the present disclosure.

[0058] FIG. 8 is another example of an internal block diagram of an image display device according to an embodiment of the present disclosure.

[0059] FIGS. 9a to 14c are drawings referenced in the description of FIGS. 7 to 8.

[0060] FIG. 15 is an example of a flowchart illustrating the operation method of a wireless power transmission device and a wireless power receiving device according to an embodiment of the present disclosure.

[0061] Figure 16 is a drawing referenced in the description of Figure 15.

[0062] FIG. 17 is a drawing illustrating an image display device according to another embodiment of the present disclosure.

[0063] FIG. 18 is an example of an internal block diagram of the image display device of FIG. 17.

[0064] The present disclosure will be described in more detail below with reference to the drawings.

[0065] The suffixes "module" and "part" for components used in the following description are assigned solely for the ease of drafting this specification and do not inherently confer any particularly significant meaning or role. Accordingly, the terms "module" and "part" may be used interchangeably.

[0066] FIG. 1 is a drawing illustrating an image display device according to one embodiment of the present disclosure.

[0067] Referring to the drawing, the image display device (100) operates based on wireless power transmission.

[0068] To this end, an image display device (100) according to one embodiment of the present disclosure includes a wireless power transmission device (20) that transmits power wirelessly, a wireless power receiving device (30) that receives wireless power from the wireless power transmission device (20), and a display (180).

[0069] Meanwhile, the wireless power transmission device (20) is separated from the wireless power receiving device (30) and can transmit wireless power by magnetic induction.

[0070] In the drawing, a wireless power transmission device (20) is positioned at the bottom of a support frame (FR), and a wireless power receiving device (30) is positioned at the top of the wireless power transmission device (20) and spaced apart from the wireless power transmission device (20).

[0071] Meanwhile, the wireless power transmission device (20) can be placed at the bottom of the display (180).

[0072] Meanwhile, the wireless power transmission device (20) and the display (180) are provided within the display device (50), and the display device (50) can be supported by a support frame (FR).

[0073] Meanwhile, the wireless power transmission device (20) can be electrically connected to a power inlet (not shown) that supplies alternating voltage or a multi-tap (505) connected to the power inlet through a power cable (CAB) and a plug (PG).

[0074] In the drawing, a wireless power transmission device (20) is electrically connected to a multi-tap (505) connected to a power inlet via a power cable (CAB) and a plug (PG).

[0075] Meanwhile, when the switch (508) in the multi-tap (505) is turned on, the input AC voltage (Va) is supplied to the wireless power transmission device (20), and when the switch (508) in the multi-tap (505) is turned off, the supply of the input AC voltage (Va) to the wireless power transmission device (20) is stopped.

[0076] Meanwhile, unlike the drawing, an input alternating current voltage (Va) can be continuously supplied to the wireless power transmission device (20).

[0077] Meanwhile, the display (180) can be implemented as any one of various panels. For example, the display (180) can be any one of a liquid crystal display panel (LCD panel), an organic light-emitting panel (OLED panel), an inorganic light-emitting panel (LED panel), etc.

[0078] Meanwhile, the image display device (100) of Fig. 1 can be a TV, monitor, signage display, etc.

[0079] Figure 2 is an example of an internal block diagram of the image display device of Figure 1.

[0080] Referring to FIG. 2, an image display device (100) according to one embodiment of the present disclosure includes a wireless power transmission device (20) that transmits power wirelessly, a wireless power receiving device (30) that receives wireless power from the wireless power transmission device (20), a display (180), and a power supply unit (190).

[0081] Meanwhile, an image display device (100) according to one embodiment of the present disclosure may further include an image receiving unit (105), an external device interface unit (130), a storage unit (140), a user input interface unit (150), a sensor unit (not shown), a signal processing unit (170), and an audio output unit (185).

[0082] The video receiving unit (105) may include a tuner unit (110), a demodulator unit (120), a network interface unit (130), and an external device interface unit (130).

[0083] Meanwhile, the video receiving unit (105), unlike the drawing, may include only the tuner unit (110), the demodulation unit (120), and the external device interface unit (130). That is, it may not include the network interface unit (130).

[0084] The tuner unit (110) selects an RF (Radio Frequency) broadcast signal corresponding to a channel selected by the user or all previously stored channels among the RF broadcast signals received through an antenna (not shown). Additionally, it converts the selected RF broadcast signal into an intermediate frequency signal or a baseband video or audio signal.

[0085] For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF), and if it is an analog broadcast signal, it is converted into an analog baseband video or audio signal (CVBS / SIF). 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 a signal processing device (170).

[0086] Meanwhile, the tuner unit (110) may be equipped with multiple tuners to receive multiple channels of broadcast signals. Alternatively, a single tuner that simultaneously receives multiple channels of broadcast signals is also possible.

[0087] The demodulator (120) receives the digital IF signal (DIF) converted by the tuner (110) and performs a demodulation operation.

[0088] 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.

[0089] The stream signal output from the demodulation unit (120) can be input to the signal processing unit (170). The signal processing unit (170) performs demultiplexing, video / audio signal processing, etc., then outputs video to the display (180) and outputs audio to the audio output unit (185).

[0090] The external device interface unit (130) can transmit or receive data with a connected external device (not shown), for example, a set-top box (50). To this end, the external device interface unit (130) may include an A / V input / output unit (not shown).

[0091] The external device interface section (130) can be connected wirelessly or via wired connection to external devices such as a DVD (Digital Versatile Disk), Blu-ray, game console, camera, camcorder, computer (laptop), set-top box, etc., and can also perform input / output operations with the external devices.

[0092] The A / V input / output unit can receive video and audio signals from an external device. Meanwhile, the wireless communication unit (not shown) can perform short-range wireless communication with other electronic devices.

[0093] Through such a wireless communication unit (not shown), the external device interface unit (130) can exchange data with an adjacent mobile terminal (600). In particular, the external device interface unit (130) can receive device information, information on an application being executed, an application image, etc. from the mobile terminal (600) in mirroring mode.

[0094] The network interface unit (135) provides an interface for connecting the video display device (100) to a wired / wireless network including the Internet network. For example, the network interface unit (135) can receive content or data provided by the Internet or a content provider or network operator through the network.

[0095] Meanwhile, the network interface section (135) may include a wireless communication section (not shown).

[0096] The storage unit (140) may store a program for each signal processing and control within the signal processing device (170), and may also store a signal-processed image, voice, or data signal.

[0097] Additionally, the storage unit (140) may perform the function of temporarily storing video, audio, or data signals input to the external device interface unit (130). Additionally, the storage unit (140) may store information regarding a predetermined broadcast channel through a channel memory function such as a channel map.

[0098] Although FIG. 2 illustrates an embodiment in which the storage unit (140) is provided separately from the signal processing device (170), the scope of the present disclosure is not limited thereto. The storage unit (140) may be included within the signal processing device (170).

[0099] The user input interface unit (150) transmits a signal input by the user to the signal processing device (170) or transmits a signal from the signal processing device (170) to the user.

[0100] For example, user input signals such as power on / off, channel selection, and screen settings can be transmitted / received from a remote control device (200), user input signals input from local keys (not shown) such as a power key, channel key, volume key, and setting value can be transmitted to a signal processing device (170), user input signals input from a sensor unit (not shown) that senses a user's gesture can be transmitted to a signal processing device (170), or signals from the signal processing device (170) can be transmitted to a sensor unit (not shown).

[0101] The signal processing device (170) can demultiplex a stream input through the tuner unit (110), the demodulator unit (120), the network interface unit (135), or the external device interface unit (130), or process the demultiplexed signals to generate and output a signal for video or audio output.

[0102] For example, the signal processing device (170) can receive a broadcast signal or an HDMI signal, etc., received from the video receiving unit (105), perform signal processing based on the received broadcast signal or HDMI signal, and output a signal-processed video signal.

[0103] The image signal processed by the signal processing device (170) can be input to the display (180) and displayed as an image corresponding to the image signal. Additionally, the image signal processed by the signal processing device (170) can be input to an external output device through the external device interface unit (130).

[0104] The voice signal processed by the signal processing device (170) can be sound-outputted to the audio output unit (185). Additionally, the voice signal processed by the signal processing device (170) can be input to an external output device through the external device interface unit (130).

[0105] Although not illustrated in FIG. 2, the signal processing device (170) may include a demultiplexer, an image processing unit, etc. That is, the signal processing device (170) can perform various signal processing and, accordingly, can be implemented in the form of a System On Chip (SOC). This will be described later with reference to FIG. 3.

[0106] In addition, the signal processing device (170) can control the overall operation within the image display device (100). For example, the signal processing device (170) can control the tuner unit (110) to control the selection (tuning) of an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0107] In addition, the signal processing device (170) can control the image display device (100) by a user command or internal program input through the user input interface unit (150).

[0108] Meanwhile, the signal processing device (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 video, and may be a 2D image or a 3D image.

[0109] Meanwhile, the signal processing device (170) can cause a predetermined object to be displayed within the image displayed on the display (180). For example, the object may 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.

[0110] Meanwhile, the signal processing device (170) can recognize the user's location based on an image captured by a shooting unit (not shown). For example, it can determine the distance (z-axis coordinate) between the user and the image display device (100). In addition, it can determine the x-axis coordinate and y-axis coordinate within the display (180) corresponding to the user's location.

[0111] The display (180) generates a driving signal by converting a video signal, data signal, OSD signal, control signal processed by a signal processing device (170) or a video signal, data signal, control signal, etc. received from an external device interface unit (130).

[0112] Meanwhile, the display (180) can be configured as a touch screen and used as an input device in addition to an output device.

[0113] The audio output unit (185) receives a voice-processed signal from the signal processing unit (170) and outputs it as voice.

[0114] The shooting unit (not shown) photographs the user. The shooting unit (not shown) can be implemented with one camera, but is not limited thereto, and can also be implemented with multiple cameras. Image information captured by the shooting unit (not shown) can be input to a signal processing device (170).

[0115] The signal processing device (170) can detect a user's gesture based on each or a combination of an image captured from a shooting unit (not shown) or a signal detected from a sensor unit (not shown).

[0116] The power supply unit (190) supplies power throughout the image display device (100). In particular, the power supply unit (190) can supply power to a signal processing device (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.

[0117] Specifically, the power supply unit (190) comprises a DC / DC converter (910 in FIG. 7) that converts a first DC voltage (Vrc) from a wireless power receiving device (30) to output a display driving voltage (Vdd), and a control unit (770 in FIG. 7) that controls the DC / DC converter (910).

[0118] The remote control device (200) transmits user input to the user input interface unit (150). To this end, the remote control device (200) may use Bluetooth, RF (Radio Frequency) communication, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, etc. Additionally, the remote control device (200) may receive video, audio, or data signals output from the user input interface unit (150) and display or output audio from the remote control device (200).

[0119] Meanwhile, the above-described video display device (100) may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasts.

[0120] Meanwhile, the block diagram of the image display device (100) illustrated in FIG. 2 is a block diagram for an embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the image display device (100) actually implemented. That is, as needed, two or more components may be combined into one component, or one component may be subdivided into two or more components. Furthermore, the functions performed in each block are intended to explain the embodiments of the present disclosure, and the specific operations or devices thereof do not limit the scope of the rights of the present disclosure.

[0121] Meanwhile, the display device (50) illustrated in FIG. 1 may include a wireless power receiving device (30), a display (180), a power supply unit (190), an image receiving unit (105), an external device interface unit (130), a storage unit (140), a user input interface unit (150), a signal processing device (170), and an audio output unit (185).

[0122] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0123] Referring to the drawings, a signal processing device (170) according to one embodiment of the present disclosure may include a demultiplexer (310), an image processing unit (320), a processor (330), and an audio processing unit (370). Additionally, it may further include a data processing unit (not shown).

[0124] The demultiplexer (310) demultiplexes the input stream. For example, if an MPEG-2 TS is input, it can be demultiplexed to separate it into video, audio, and data signals. 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).

[0125] The image processing unit (320) can perform signal processing on the input image. For example, the image processing unit (320) can perform image processing on the image signal demultiplexed from the demultiplexing unit (310).

[0126] To this end, the image processing unit (320) may include an image decoder (325), a scaler (335), an image quality processing unit (635), an image encoder (not shown), a graphics processing unit (340), a frame rate conversion unit (350), and a formatter (360), etc.

[0127] The video decoder (325) decodes the demultiplexed video signal, and the scaler (335) performs scaling so that the resolution of the decoded video signal can be output on the display (180).

[0128] The image decoder (325) may be equipped with decoders of various specifications. For example, it may be equipped with MPEG-2, H,264 decoders, 3D image decoders for color images and depth images, decoders for multiple viewpoint images, etc.

[0129] The scaler (335) can scale the input video signal, which has been decoded in the video decoder (325), etc.

[0130] For example, the scaler (335) can upscale when the size or resolution of the input video signal is small, and downscale when the size or resolution of the input video signal is large.

[0131] The image quality processing unit (635) can perform image quality processing on the input image signal, which has been decoded in the image decoder (325), etc.

[0132] For example, the image processing unit (635) can perform noise removal processing of the input video signal, expand the resolution of the grayscale of the input video signal, perform image resolution enhancement, perform high dynamic range (HDR) based signal processing, vary the frame rate, and perform image processing corresponding to panel characteristics, particularly the panel.

[0133] The graphics processing unit (340) generates an OSD signal based on user input or independently. For example, based on a user input signal, it can generate a signal to display various information as graphics or text on the screen of the display (180). The generated OSD signal may include various data such as a user interface screen of the image display device (100), various menu screens, widgets, and icons. Additionally, the generated OSD signal may include 2D objects or 3D objects.

[0134] Additionally, the graphics processing unit (340) can generate a pointer that can be displayed on a display based on a pointing signal input from the remote control device (200). In particular, such a pointer can be generated in a pointing signal processing unit, and the graphics processing unit (240) may include such a pointing signal processing unit (not shown). Of course, it is also possible for the pointing signal processing unit (not shown) to be provided separately rather than being provided within the graphics processing unit (240).

[0135] The frame rate converter (FRC) (350) can convert the frame rate of the input video. Meanwhile, the frame rate converter (350) can also output the video as is without separate frame rate conversion.

[0136] Meanwhile, the formatter (360) can convert the format of the input video signal into a video signal for display on a display and output it.

[0137] In particular, the formatter (360) can change the format of the video signal to correspond to the display panel.

[0138] Meanwhile, the formatter (360) may change the format of the video signal.

[0139] The processor (330) can control the overall operation within the image display device (100) or the signal processing device (170).

[0140] For example, the processor (330) can control the tuner (110) to select (Tuning) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0141] Additionally, the processor (330) can control the image display device (100) by means of a user command or an internal program input through the user input interface unit (150).

[0142] Additionally, the processor (330) can perform data transmission control with the network interface unit (135) or the external device interface unit (130).

[0143] Additionally, the processor (330) can control the operation of the demultiplexer (310), image processing unit (320), etc., within the signal processing device (170).

[0144] Meanwhile, the audio processing unit (370) within the signal processing device (170) can perform voice processing of the demultiplexed voice signal. To this end, the audio processing unit (370) may be equipped with various decoders.

[0145] Additionally, the audio processing unit (370) within the signal processing device (170) can process bass, treble, volume control, etc.

[0146] A data processing unit (not shown) within a signal processing device (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 containing broadcast information such as the start time and end time of a broadcast program aired on each channel.

[0147] Meanwhile, the block diagram of the signal processing device (170) illustrated in FIG. 3 is a block diagram for an embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the signal processing device (170) actually implemented.

[0148] In particular, the frame rate converter (350) and the formatter (360) may be provided separately from the image processing unit (320).

[0149] Meanwhile, the signal processing device (170) according to one embodiment of the present disclosure may further include a neural network processor (333) for learning processing, etc.

[0150] FIG. 4a is a diagram illustrating a control method of the remote control device of FIG. 2.

[0151] As illustrated in (a) of FIG. 4a, a pointer (205) corresponding to the remote control device (200) is displayed on the display (180).

[0152] The user can move or rotate the remote control device (200) up and down, left and right ((b) of FIG. 4a), and forward and backward ((c) of FIG. 4a). The pointer (205) displayed on the display (180) of the image display device corresponds to the movement of the remote control device (200). Since the pointer (205) of the remote control device (200) moves and is displayed according to the movement in 3D space as shown in the drawing, it can be named a spatial remote control or a 3D pointing device.

[0153] Figure 4a (b) illustrates that when the user moves the remote control device (200) to the left, the pointer (205) displayed on the display (180) of the image display device also moves to the left in response.

[0154] Information regarding the movement of the remote control device (200) detected through the sensor of the remote control device (200) is transmitted to the image display device. The image display device can calculate the coordinates of the pointer (205) from the information regarding the movement of the remote control device (200). The image display device can display the pointer (205) to correspond to the calculated coordinates.

[0155] Figure 4a (c) illustrates a case where, while pressing a specific button within the remote control device (200), the user moves the remote control device (200) away from the display (180). By doing so, the selected area within the display (180) corresponding to the pointer (205) can be zoomed in and enlarged. Conversely, when the user moves the remote control device (200) closer to the display (180), the selected area within the display (180) corresponding to the pointer (205) can be zoomed out and reduced. Meanwhile, when the remote control device (200) moves away from the display (180), the selected area is zoomed out, and when the remote control device (200) moves closer to the display (180), the selected area may be zoomed in.

[0156] Meanwhile, when a specific button within the remote control device (200) is pressed, recognition of up-down and left-right movement may be excluded. That is, when the remote control device (200) moves away from or closer to the display (180), up-down, left-right movement is not recognized, and only forward-backward movement is recognized. When the specific button within the remote control device (200) is not pressed, only the pointer (205) moves according to the up-down, left-right movement of the remote control device (200).

[0157] Meanwhile, the movement speed or direction of movement of the pointer (205) can correspond to the movement speed or direction of movement of the remote control device (200).

[0158] Figure 4b is an internal block diagram of the remote control device of Figure 2.

[0159] Referring to the drawing, the remote control device (200) may include a wireless communication unit (425), a user input unit (435), a sensor unit (440), an output unit (450), a power supply unit (460), a storage unit (470), and a control unit (480).

[0160] The wireless communication unit (425) transmits and receives signals with any one of the image display devices according to the embodiments of the present disclosure described above. Among the image display devices according to the embodiments of the present disclosure, one image display device (100) will be described as an example.

[0161] In this embodiment, the remote control device (200) may be equipped with an RF module (421) capable of transmitting and receiving signals to and from the image display device (100) according to RF communication standards. Additionally, the remote control device (200) may be equipped with an IR module (423) capable of transmitting and receiving signals to and from the image display device (100) according to IR communication standards.

[0162] In this embodiment, the remote control device (200) transmits a signal containing information regarding the movement of the remote control device (200), etc., to the video display device (100) through the RF module (421).

[0163] Additionally, the remote control device (200) can receive a signal transmitted by the video display device (100) through the RF module (421). Additionally, the remote control device (200) can transmit commands regarding power on / off, channel change, volume change, etc. to the video display device (100) through the IR module (423) as needed.

[0164] The user input unit (435) may be composed of a keypad, buttons, a touchpad, or a touch screen. The user may input commands related to the image display device (100) to the remote control device (200) by operating the user input unit (435). If the user input unit (435) is equipped with a hard key button, the user may input commands related to the image display device (100) to the remote control device (200) through a push operation of the hard key button. If the user input unit (435) is equipped with a touch screen, the user may input commands related to the image display device (100) to the remote control device (200) by touching the soft keys of the touch screen. Additionally, the user input unit (435) may be equipped with various types of input means that the user can operate, such as a scroll key or a jog key, and this embodiment does not limit the scope of the rights of this disclosure.

[0165] The sensor unit (440) may be equipped with a gyroscope sensor (441) or an accelerometer sensor (443). The gyroscope sensor (441) can sense information regarding the movement of the remote control device (200).

[0166] For example, the gyroscope sensor (441) can sense information regarding the operation of the remote control device (200) based on the x, y, and z axes. The accelerometer sensor (443) can sense information regarding the movement speed of the remote control device (200), etc. Meanwhile, a distance measuring sensor may be further provided, thereby allowing the distance to be sensed from the display (180).

[0167] The output unit (450) can output a video or audio signal corresponding to the operation of the user input unit (435) or a signal transmitted from the video display device (100). Through the output unit (450), the user can recognize whether the user input unit (435) is operated or whether the video display device (100) is controlled.

[0168] For example, the output unit (450) may be equipped with an LED module (451) that lights up when the user input unit (435) is operated or when a signal is transmitted and received with the image display device (100) through the wireless communication unit (425), a vibration module (453) that generates vibration, a sound output module (455) that outputs sound, or a display module (457) that outputs image.

[0169] The power supply unit (460) supplies power to the remote control device (200). The power supply unit (460) can reduce power waste by stopping the power supply when the remote control device (200) does not move for a predetermined period of time. The power supply unit (460) can resume the power supply when a predetermined key provided in the remote control device (200) is operated.

[0170] The storage unit (470) may store various types of programs, application data, etc., necessary for the control or operation of the remote control device (200). If the remote control device (200) transmits and receives signals wirelessly through the video display device (100) and the RF module (421), the remote control device (200) and the video display device (100) transmit and receive signals through a predetermined frequency band. The control unit (480) of the remote control device (200) may store and refer to information regarding the frequency band, etc., for wirelessly transmitting and receiving signals with the video display device (100) paired with the remote control device (200) in the storage unit (470).

[0171] The control unit (480) controls all matters related to the control of the remote control device (200). The control unit (480) can transmit a signal corresponding to a predetermined key operation of the user input unit (435) or a signal corresponding to the movement of the remote control device (200) sensed by the sensor unit (440) to the image display device (100) through the wireless communication unit (425).

[0172] The user input interface unit (150) of the image display device (100) may be equipped with a wireless communication unit (151) capable of wirelessly transmitting and receiving signals with a remote control device (200), and a coordinate value calculation unit (415) capable of calculating coordinate values ​​of a pointer corresponding to the operation of the remote control device (200).

[0173] The user input interface unit (150) can wirelessly transmit and receive signals to and from the remote control device (200) through the RF module (412). It can also receive signals transmitted by the remote control device (200) according to the IR communication standard through the IR module (413).

[0174] The coordinate value calculation unit (415) can calculate the coordinate values ​​(x,y) of the pointer (205) to be displayed on the display (170) by correcting for hand tremor or error from the signal corresponding to the operation of the remote control device (200) received through the wireless communication unit (151).

[0175] The transmission signal of the remote control device (200) input to the video display device (100) through the user input interface unit (150) is transmitted to the signal processing unit (170) of the video display device (100). The signal processing unit (170) can determine information regarding 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) accordingly.

[0176] As another example, the remote control device (200) can calculate a pointer coordinate value corresponding to the operation and output it 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 regarding the received pointer coordinate value to the signal processing device (170) without a separate hand tremor or error correction process.

[0177] In addition, as another example, the coordinate value calculation unit (415) may be provided inside the signal processing unit (170) rather than the user input interface unit (150), unlike in the drawing.

[0178] Figure 5 is an example of an internal block diagram of the display of Figure 2.

[0179] Referring to the drawing, the organic light-emitting panel-based display (180) may include an organic light-emitting panel (210), a first interface unit (230), a second interface unit (231), a timing controller (232), a gate driver (234), a data driver (236), a memory (240), a processor (270), a power supply unit (290), a current detection unit (510), etc.

[0180] The display (180) 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).

[0181] Meanwhile, the first interface unit (230) within the display (180) can receive a video signal (Vd) and a first DC voltage (V1) from the signal processing device (170).

[0182] Here, the first DC voltage (V1) can be used for the operation of the power supply (290) and the timing controller (232) within the display (180).

[0183] Next, the second interface unit (231) can receive a second DC voltage (V2) from an external power supply unit (190). Meanwhile, the second DC voltage (V2) can be input to a data driving unit (236) within the display (180).

[0184] The timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on the video signal (Vd).

[0185] For example, when the first interface unit (230) converts an input video signal (Vd) and outputs a converted video signal (va1), the timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on the converted video signal (va1).

[0186] The timing controller (232) can receive additional signals, such as a control signal and a vertical synchronization signal (Vsync), in addition to the video signal (Vd) from the signal processing device (170).

[0187] In addition, the timing controller (232) can output a gate driving signal (Sga) for the operation of the gate driving unit (234) and a data driving signal (Sda) for the operation of the data driving unit (236) based on a control signal, a vertical synchronization signal (Vsync), etc., in addition to the video signal (Vd).

[0188] The data driving signal (Sda) at this time may be a data driving signal for driving RGBW subpixels when the panel (210) has RGBW subpixels.

[0189] Meanwhile, the timing controller (232) can further output a control signal (Cs) to the gate driver (234).

[0190] The gate driver (234) and the data driver (236) supply a scanning signal and an image signal to the organic light-emitting panel (210) through the gate line (GL) and the data line (DL), respectively, according to the gate driving signal (Sga) and the data driving signal (Sda) from the timing controller (232). Accordingly, the organic light-emitting panel (210) displays a predetermined image.

[0191] Meanwhile, the organic light-emitting panel (210) may include an organic light-emitting layer, and to display an image, a plurality of gate lines (GL) and data lines (DL) may be arranged in an intersecting matrix form at each pixel corresponding to the organic light-emitting layer.

[0192] Meanwhile, the data driving unit (236) can output a data signal to the organic light-emitting panel (210) based on the second DC voltage (V2) from the second interface unit (231).

[0193] The power supply unit (290) can supply various power sources to the gate driving unit (234), the data driving unit (236), the timing controller (232), etc.

[0194] The current detection unit (510) can detect the current flowing through the subpixel of the organic light-emitting panel (210). The detected current can be input to a processor (270), etc., for the purpose of calculating the accumulated current.

[0195] The processor (270) can perform various controls within the display (180). For example, it can control the gate driver (234), the data driver (236), the timing controller (232), etc.

[0196] Meanwhile, the processor (270) can receive current information flowing to a subpixel of the organic light-emitting panel (210) from the current detection unit (510).

[0197] FIGS. 6a and 6b are drawings referenced in the description of the organic light-emitting panel of FIG. 5.

[0198] First, FIG. 6a is a drawing showing a pixel within an organic light-emitting panel (210b).

[0199] Referring to the drawing, the organic light-emitting panel (210b) 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) that intersect therewith.

[0200] Meanwhile, a pixel (subpixel) is defined in the intersection area of ​​the scan line and the data line within the organic light-emitting panel (210b). In the drawing, a pixel having RGBW subpixels (SR1, SG1, SB1, SW1) is shown.

[0201] FIG. 6b illustrates a circuit of a subpixel within a pixel of the organic light-emitting panel of FIG. 6a.

[0202] Referring to the drawing, the organic light-emitting subpixel circuit (CRTm) may be an active type and may include a scan switching element (SW1), a storage capacitor (Cst), a driving switching element (SW2), and an organic light-emitting layer (OLED).

[0203] A scan switching element (SW1) has a scan line connected to its gate terminal and turns on according to an input scan signal (Vdscan). When turned on, it transmits an input data signal (Vdata) to the gate terminal of a driving switching element (SW2) or to one end of a storage capacitor (Cst).

[0204] A storage capacitor (Cst) is formed between the gate terminal and the source terminal of a driving switching element (SW2) and stores a predetermined difference between a data signal level transmitted to one end of the storage capacitor (Cst) and a DC voltage (Vdd) level transmitted to the other end of the storage capacitor (Cst).

[0205] For example, if the data signal has different levels according to the PAM (Pulse Amplitude Modulation) method, the power level stored in the storage capacitor (Cst) changes depending on the level difference of the data signal (Vdata).

[0206] As another example, when the data signal has different pulse widths according to the PWM (Pulse Width Modulation) method, the power level stored in the storage capacitor (Cst) changes depending on the difference in the pulse width of the data signal (Vdata).

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[0208] The organic light-emitting layer (OLED) includes an RGBW light-emitting 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, etc.

[0209] Meanwhile, although all subpixels in the organic light-emitting layer (OLED) emit white light, separate color filters are provided for green, red, and blue subpixels to enable color implementation. That is, green, red, and blue subpixels are each provided with additional green, red, and blue color filters, respectively. On the other hand, since the white subpixel emits white light, a separate color filter is not required.

[0210] Meanwhile, in the drawing, the scan switching element (SW1) and the driving switching element (SW2) are exemplified as p-type MOSFETs, but it is also possible to use n-type MOSFETs or other switching elements such as JFETs, IGBTs, or SICs.

[0211] Meanwhile, a pixel is a hold-type device that continues to emit light from an organic light-emitting layer (OLED) after a scan signal is applied during a unit display period, specifically during a unit frame.

[0212] FIG. 7 is an example of an internal block diagram of an image display device according to an embodiment of the present disclosure.

[0213] Referring to the drawings, an image display device (100) according to an embodiment of the present disclosure includes a wireless power transmission device (20) that transmits power wirelessly, a wireless power receiving device (30) that receives wireless power from the wireless power transmission device (20), a power supply unit (190) that converts a first DC voltage (Vrc) from the wireless power receiving device (30) and outputs a display driving voltage (Vdd), and a display (180).

[0214] Meanwhile, an image display device (100) according to one embodiment of the present disclosure further includes a signal processing device (170) that outputs an image signal to a display (180).

[0215] Meanwhile, a wireless power transmission device (20) according to an embodiment of the present disclosure includes an AC / DC converter (905) that converts an input AC voltage (Vac) into a DC voltage, a DC / DC converter (907) that converts the level of the DC voltage from the AC / DC converter (905), a wireless transmission unit (710) that operates for wireless power transmission based on the DC voltage from the DC / DC converter (907), and a transmission coil (CLa).

[0216] Meanwhile, the wireless transmission unit (710) may include an inverter (712) connected to a transmission coil (CLa) by having a plurality of switching elements, a processor (714) that controls the inverter (712), and a communication unit (716) that communicates with a wireless power receiving device (30).

[0217] Meanwhile, the communication unit (716) can perform communication based on Bluetooth, Zigbee, ultra-wideband communication (UWB), Wi-Fi, etc.

[0218] Meanwhile, a wireless power receiving device (30) according to an embodiment of the present disclosure includes a receiving coil (CLb) and a wireless receiving unit (720) connected to the receiving coil (CLb) and operating for receiving wireless power.

[0219] Meanwhile, the wireless receiver (720) may include a rectifier (722) connected to a receiving coil (CLb), a processor (724) that controls the operation of the rectifier (722), and a communication unit (726) that communicates with the wireless power transmission device (20).

[0220] Meanwhile, the rectifier (722) may be configured as a full bridge and may be equipped with a plurality of switching elements.

[0221] Alternatively, the rectifier (722) may be configured as a half-bridge and may be equipped with a plurality of switching elements and a plurality of diode elements.

[0222] Alternatively, the rectifier (722) may be configured as a full bridge and may be equipped with a plurality of diode elements.

[0223] Meanwhile, the communication unit (726) can perform communication based on Bluetooth, Zigbee, ultra-wideband communication (UWB), Wi-Fi, etc.

[0224] Meanwhile, the power supply unit (190) includes a DC / DC converter (910) that converts a first DC voltage (Vrc) from a wireless power receiving device (30) to output a display driving voltage (Vdd), and a control unit (770) that controls the DC / DC converter (910).

[0225] Meanwhile, the display driving voltage (Vdd) output from the power supply unit (190) is supplied to the display (180).

[0226] Meanwhile, if the display (180) is an organic light-emitting panel, the display driving voltage (Vdd) may be the pixel driving voltage of the organic light-emitting pixel.

[0227] Meanwhile, if the display (180) is an inorganic light-emitting panel, the display driving voltage (Vdd) may be the pixel driving voltage of the inorganic light-emitting pixel.

[0228] Meanwhile, if the display (180) is a liquid crystal panel, the display driving voltage (Vdd) may be a backlight driving voltage or a liquid crystal pixel driving voltage.

[0229] Meanwhile, depending on the wireless power transmission environment, etc., the first DC voltage (Vrc) from the wireless power receiving device (30) varies.

[0230] For example, the input voltage (Vac) may be approximately 220V, and the first DC voltage (Vrc) from the wireless power receiving device (30) may vary between approximately VLn and VLm. Specifically, the first DC voltage (Vrc) may vary between 400 and 700V.

[0231] Meanwhile, the display driving voltage (Vdd) may be approximately VLp, which is smaller than the first DC voltage (Vrc). Specifically, the display driving voltage (Vdd) may be approximately between 21V and 30V.

[0232] That is, the variation range (Rga) of the first DC voltage (Vrc) from the wireless power receiving device (30) can be greater than the root mean square (RMS) voltage of the input voltage (Vac).

[0233] Alternatively, the variation range (Rga) of the first DC voltage (Vrc) from the wireless power receiving device (30) may be smaller than the peak voltage of the input voltage (Vac).

[0234] Meanwhile, the level of the first DC voltage (Vrc) from the wireless power receiving device (30) may be greater than the peak voltage of the input voltage (Vac).

[0235] In this way, in response to fluctuations in the first DC voltage (Vrc) from the wireless power receiving device (30), it is preferable that the DC / DC converter (910) in the power supply unit (190) according to the embodiment of the present disclosure stably outputs the display driving voltage (Vdd).

[0236] Accordingly, the power supply unit (190) may further include an input voltage detection unit (DA) that detects a first DC voltage (Vrc) from a wireless power receiving device (30).

[0237] Meanwhile, the power supply unit (190) may further include an input voltage detection unit (DA) and an output voltage detection unit (DD) that detects the display driving voltage (Vdd) output from the DC / DC converter (910).

[0238] Meanwhile, the power supply unit (190) may further include an input voltage detection unit (DA), an output voltage detection unit (DD), and an input current detection unit (DB) that detects the current flowing from the wireless power receiving device (30) to the DC / DC converter (910).

[0239] Meanwhile, the control unit (770) can control the DC / DC converter (910) based on the first DC voltage (Vrc) detected by the input voltage detection unit (DA).

[0240] Meanwhile, the control unit (770) can control the DC / DC converter (910) based on the first DC voltage (Vrc) detected by the input voltage detection unit (DA) and the display driving voltage (Vdd) detected by the output voltage detection unit (DD).

[0241] Meanwhile, the control unit (770) can control the DC / DC converter (910) based on the first DC voltage (Vrc) detected by the input voltage detection unit (DA), the display driving voltage (Vdd) detected by the output voltage detection unit (DD), and the current detected by the input current detection unit (DB).

[0242] Meanwhile, the DC / DC converter (910) is equipped with a plurality of switching elements.

[0243] Specifically, the DC / DC converter (910) comprises a first switching element (S1 in FIG. 9a) and a second switching element (S2 in FIG. 9a) connected in series within a first leg (lego in FIG. 9a), and a third switching element (S3 in FIG. 9a) and a fourth switching element (S4 in FIG. 9a) connected in series within a second leg (legp in FIG. 9a) connected in parallel with the first leg (lego).

[0244] Meanwhile, the control unit (770) can control the first switching element (S1) and the second switching element (S2) to switch complementarily, and the third switching element (S3) and the fourth switching element (S4) to switch complementarily.

[0245] Meanwhile, the control unit (770) overlaps a portion of the turn-on period of the first switching element (S1) and the fourth switching element (S4) during phase shift mode operation, and varies the overlap period of the turn-on of the first switching element (S1) and the fourth switching element (S4) according to the level of the first DC voltage (Vrc).

[0246] Meanwhile, the control unit (770) can control the first switching element (S1) and the fourth switching element (S4) so ​​that when the first DC voltage (Vrc) is at the first level, the overlap period during turn-on is the first period.

[0247] Meanwhile, the control unit (770) can control the first DC voltage (Vrc) to be greater than the first level and the second level when the first switching element (S1) and the fourth switching element (S4) turn on to be less than the first period.

[0248] For example, the control unit (770) can control the overlapping period when the first switching element (S1) and the fourth switching element (S4) turn on when the level of the first DC voltage (Vrc) is approximately 620V to be a first period, and when the level of the first DC voltage (Vrc) is approximately 670V to be a second period when the overlapping period when the first switching element (S1) and the fourth switching element (S4) turn on to be smaller than the first period.

[0249] Meanwhile, the control unit (770) can increase the overlap period when the first switching element (S1) and the fourth switching element (S4) turn on as the level of the first DC voltage (Vrc) decreases during phase shift mode operation. Accordingly, it is possible to stably display an image in response to fluctuations in the first DC voltage (Vrc).

[0250] Meanwhile, the control unit (770) can control the operation to be in phase shift mode when the level of the first DC voltage (Vrc) is above the reference level, and when the level of the first DC voltage (Vrc) is below the reference level, control the turn-on period of the first switching element (S1) and the fourth switching element (S4) to overlap completely.

[0251] For example, the control unit (770) can control the first DC voltage (Vrc) to operate in a phase shift mode when the level of the first DC voltage is above a reference level and below an upper limit level.

[0252] Meanwhile, the control unit (770) can control the first DC voltage (Vrc) so that it does not operate in phase shift mode when the level of the first DC voltage (Vrc) is between the lower limit level and the reference level. That is, it can control the first switching element (S1) and the fourth switching element (S4) so ​​that their turn-on periods overlap completely. Accordingly, it is possible to stably display an image in response to fluctuations in the level of the first DC voltage (Vrc).

[0253] Meanwhile, the control unit (770) can control the wireless power receiving device (30) to be powered off when the level of the first DC voltage (Vrc) is below the lower limit level.

[0254] Meanwhile, the control unit (770) can control the wireless power receiving device (30) and the wireless power transmission device (20) to be powered off when the level of the first DC voltage (Vrc) is below the lower limit level.

[0255] Meanwhile, the control unit (770) can control the wireless power receiving device (30) to be powered off when the level of the first DC voltage (Vrc) exceeds the upper limit level.

[0256] Meanwhile, the control unit (770) can control the wireless power receiving device (30) and the wireless power transmission device (20) to be powered off when the level of the first DC voltage (Vrc) exceeds the upper limit level.

[0257] Meanwhile, the control unit (770) can control the wireless power receiving device (30) and the wireless power transmission device (20) to be turned on again after a predetermined time has elapsed following the power off. Accordingly, the wireless power receiving device (30) and the wireless power transmission device (20) can be operated stably.

[0258] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when they turn on to the third period when the level of the display driving voltage (Vdd) is the third level.

[0259] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when they turn on to a fourth period that is greater than the third period when the level of the display driving voltage (Vdd) is a fourth level greater than the third level. Accordingly, it is possible to stably display an image in response to fluctuations in the level of the display driving voltage (Vdd).

[0260] Meanwhile, the control unit (770) can increase the overlap period of the first switching element (S1) and the fourth switching element (S4) when they turn on as the level of the display driving voltage (Vdd) increases. Accordingly, it is possible to stably display an image in response to fluctuations in the level of the display driving voltage (Vdd).

[0261] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when they turn on, so that when the distance between the wireless power transmission device (20) and the wireless power transmission device (20) is the first distance, the overlapping period is the fifth period.

[0262] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when they turn on to a sixth period that is greater than the fifth period when the distance between the wireless power transmission device (20) and the wireless power transmission device (20) is a second distance that is greater than the first distance. Accordingly, the image can be displayed stably in response to the variation in the distance between the wireless power transmission device (20) and the wireless power transmission device (20).

[0263] Meanwhile, the control unit (770) can increase the overlap period of the first switching element (S1) and the fourth switching element (S4) when they turn on as the distance between the wireless power transmission device (20) and the wireless power transmission device (20) increases. Accordingly, it is possible to stably display an image in response to variations in the distance between the wireless power transmission device (20) and the wireless power transmission device (20).

[0264] FIG. 8 is another example of an internal block diagram of an image display device according to an embodiment of the present disclosure.

[0265] Referring to the drawings, the image display device (100b) according to an embodiment of the present disclosure includes, similar to the image display device (100) according to an embodiment of the present disclosure of FIG. 7, a wireless power transmission device (20b) that transmits power wirelessly, a wireless power receiving device (30) that receives wireless power from the wireless power transmission device (20), a power supply unit (190b) that converts a first DC voltage (Vrc) from the wireless power receiving device (30) and outputs a display driving voltage (Vdd), and a display (180).

[0266] Meanwhile, the wireless power transmission device (20b) of FIG. 8 includes an AC / DC converter (905), a DC / DC converter (907), a wireless transmission unit (710), and a transmission coil (CLa), as in FIG. 7.

[0267] Meanwhile, the wireless power transmission device (20b) of FIG. 8 may further include an electromagnetic interference (EMI) noise blocking filter (910) and a rectifier (903) including a diode element at the front end of the AC / DC converter (905).

[0268] The wireless power receiving device (30) of FIG. 8 includes a receiving coil (CLb) and a wireless receiving unit (720).

[0269] Meanwhile, the power supply unit (190b) of FIG. 8 may include a DC / DC converter (910) that converts a first DC voltage (Vrc) to output a second DC voltage, a second DC / DC converter (960) that converts the level of the second DC voltage of the DC / DC converter (910) to output a display driving voltage (Vdd), and a control unit (770) that controls the DC / DC converter (910) and the second DC / DC converter (960).

[0270] For example, the DC / DC converter (910) of FIG. 8 can convert a first DC voltage (Vrc) of approximately 400V to 700V and output a second DC voltage of approximately 45V to 50V.

[0271] And, the second DC / DC converter (960) can convert a second DC voltage of approximately 45V to 50V to output a display driving voltage (Vdd) of approximately 21V to 30V. Accordingly, the display driving voltage (Vdd) can be output stably.

[0272] FIGS. 9a to 14c are drawings referenced in the description of FIGS. 7 to 8.

[0273] First, FIG. 9a is a drawing illustrating a plurality of switching elements within the DC / DC converter (910) of FIG. 7 to 8.

[0274] Referring to the drawing, the DC / DC converter (910) comprises a first switching element (S1) and a second switching element (S2) connected in series within a first leg (lego) between a noa node and a nob node, and a third switching element (S3) and a fourth switching element (S4) connected in series within a second leg (legp) connected in parallel with the first leg (lego).

[0275] Meanwhile, nm1, which is a node between the first switching element (S1) and the second switching element (S2), and nm2, which is a node between the third switching element (S3) and the fourth switching element (S4), can each be electrically connected to the input side of the transformer (905) of FIG. 11.

[0276] Meanwhile, the control unit (770) can output a switching control signal for switching each switching element (S1~S4).

[0277] For example, the control unit (770) can control the first switching element (S1) and the second switching element (S2) to switch complementarily, and the third switching element (S3) and the fourth switching element (S4) to switch complementarily.

[0278] Meanwhile, the control unit (770) can control the operation to be in phase shift mode when the level of the first DC voltage (Vrc) is above the reference level.

[0279] Meanwhile, the control unit (770) can control the first switching element (S1) and the fourth switching element (S4) so ​​that their turn-on periods overlap when the level of the first DC voltage (Vrc) is below the reference level.

[0280] Figure 9b is a figure referenced in the description of the phase shift mode.

[0281] Referring to the drawing, the control unit (770) can turn on the first switching element (S1) by outputting a high-level switching control signal during the intervals of T1 to T2, T3 to T4, T5 to T6, and T7 to T8.

[0282] Meanwhile, the control unit (770) can turn off the first switching element (S1) by outputting a low-level switching control signal during the intervals of T2 to T3, T4 to T5, T6 to T7, and T8 to T9.

[0283] Meanwhile, the control unit (770) can control the second switching element (S2) to operate complementarily to the first switching element (S1).

[0284] That is, the control unit (770) can turn off the second switching element (S2) by outputting a low-level switching control signal during the intervals of T1 to T2, T3 to T4, T5 to T6, and T7 to T8.

[0285] Meanwhile, the control unit (770) can turn on the second switching element (S2) by outputting a high-level switching control signal during the intervals of T2 to T3, T4 to T5, T6 to T7, and T8 to T9.

[0286] Meanwhile, the control unit (770) can overlap a portion of the turn-on period of the first switching element (S1) and the fourth switching element (S4) according to the phase shift mode.

[0287] As shown in the drawing, the control unit (770) can turn on the fourth switching element (S3) by outputting a high-level switching control signal during the intervals of Tr1~Tr2, Tr3~Tr4, Tr5~Tr6, and Tr7~Tr8.

[0288] Meanwhile, the control unit (770) can turn off the fourth switching element (S4) by outputting a low-level switching control signal during the intervals of T1~Tr1, Tr2~Tr3, Tr4~Tr5, and Tr6~Tr7.

[0289] Meanwhile, the control unit (770) can control the third switching element (S3) to operate complementarily with the fourth switching element (S4).

[0290] That is, the control unit (770) can turn off the third switching element (S3) by outputting a low-level switching control signal during the intervals of Tr1~Tr2, Tr3~Tr4, Tr5~Tr6, and Tr7~Tr8.

[0291] Meanwhile, the control unit (770) can turn on the third switching element (S3) by outputting a high-level switching control signal during the intervals of T1~Tr1, Tr2~Tr3, Tr4~Tr5, and Tr6~Tr7.

[0292] That is, the control unit (770) can overlap a portion of the turn-on period of the second switching element (S2) and the third switching element (S3) according to the phase shift mode.

[0293] Meanwhile, depending on the phase shift mode, the turn-on periods of the first switching element (S1) and the fourth switching element (S4) overlap during the periods of Tr1~T2, Tr3~T4, Tr5~T6, and Tr7~T8.

[0294] Meanwhile, the control unit (770) varies the overlap period of the first switching element (S1) and the fourth switching element (S4) when they turn on, according to the level of the first DC voltage (Vrc).

[0295] For example, the control unit (770) can control the overlapping period when the first switching element (S1) and the fourth switching element (S4) turn on when the level of the first DC voltage (Vrc) is approximately 620V to be a first period (Wmb) such as Tr7~T8 period, and when the level of the first DC voltage (Vrc) is approximately 670V to be a second period (Wma) such as Tr1~T2 period.

[0296] As shown in the drawing, it is preferable that the second period (Wma) is smaller than the first period (Wmb). Accordingly, it becomes possible to stably display an image in response to fluctuations in the first DC voltage (Vrc).

[0297] Meanwhile, the control unit (770) can control the operation to be performed in phase shift mode when the level of the first DC voltage (Vrc) is above the reference level and below the upper limit level.

[0298] Meanwhile, the control unit (770) can control the first DC voltage (Vrc) so that it does not operate in phase shift mode when the level of the first DC voltage (Vrc) is between the lower limit level and the reference level. Accordingly, it is possible to stably display an image in response to fluctuations in the level of the first DC voltage (Vrc).

[0299] Meanwhile, the control unit (770) can control the wireless power receiving device (30) and the wireless power transmission device (20) to be powered off when the level of the first DC voltage (Vrc) is below the lower limit level or above the upper limit level.

[0300] Meanwhile, the control unit (770) can control the wireless power receiving device (30) and the wireless power transmission device (20) to be turned on again after a predetermined time has elapsed following the power off. Accordingly, the wireless power receiving device (30) and the wireless power transmission device (20) can be operated stably.

[0301] FIG. 9c is a diagram illustrating the overlap period when the first switching element (S1) and the fourth switching element (S4) are turned on according to the level of the first DC voltage (Vrc).

[0302] Referring to the drawing, as the level of the first DC voltage (Vrc) increases, the overlap period of the first switching element (S1) and the fourth switching element (S4) when turned on becomes smaller.

[0303] Accordingly, the control unit (770) can reduce the overlap period when the first switching element (S1) and the fourth switching element (S4) turn on as the level of the first DC voltage (Vrc) increases during phase shift mode operation.

[0304] Meanwhile, the control unit (770) can increase the overlap period when the first switching element (S1) and the fourth switching element (S4) turn on as the level of the first DC voltage (Vrc) decreases during phase shift mode operation.

[0305] Figure 9d illustrates various examples of display driving voltage levels.

[0306] Referring to the drawing, the DC / DC converter (910) can output a plurality of display driving voltages (Vdda, Vddb).

[0307] For example, the first display driving voltage (Vdda) may be the third level (LV1), and the second display driving voltage (Vddb) may be the fourth level (LV2).

[0308] At this time, the third level (LV1) may be approximately 22V, and the fourth level (LV2) may be approximately 24V.

[0309] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when the level of the display driving voltage (Vdd) is the third level (LV1) to be the third period (Wma).

[0310] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when they turn on to be greater than the third period (Wma) when the level of the display driving voltage (Vdd) is greater than the fourth level (LV2). Accordingly, the image can be displayed stably in response to fluctuations in the level of the display driving voltage (Vdd).

[0311] Meanwhile, unlike the drawing, the DC / DC converter (910) may output a third display driving voltage of the fifth level (LV3). The fifth level (LV3) may be approximately 28V.

[0312] Meanwhile, the control unit (770) can control the overlapping period of the first switching element (S1) and the fourth switching element (S4) when they turn on to be greater than the fourth period (Wmb) when the level of the display driving voltage (Vdd) is the fifth level, which is greater than the fourth level (LV2). Accordingly, it is possible to stably display an image in response to fluctuations in the level of the display driving voltage (Vdd).

[0313] FIG. 10a illustrates an example of an AC / DC converter (905) of FIG. 7 to 8.

[0314] Referring to the drawing, the AC / DC converter (905) of FIG. 10a is equipped with a plurality of switching elements (Sa, Sb) and a plurality of diode elements (Da, Db), and can output a DC voltage (Vdc) by converting the level of an input AC voltage (Vac) based on the switching operation of the switching elements (Sa, Sb).

[0315] Specifically, the AC / DC converter (905) may include a third leg (lega) having a first diode element (Da) and a first switching element (Sa) connected in series with each other, and a fourth leg (legb) having a second diode element (Db) and a second switching element (Sb) connected in parallel with the third leg (lega) and connected in series with each other.

[0316] One end (cathode) of the first diode element (Da) is connected to one end (na) of the output terminal (na-nb) of the ac / dc converter (905), and the other end (anode) of the first diode element (Da) can be connected to the first node (nc).

[0317] One end of the first switching element (Sa) is connected to the first node (nc), and the other end of the first switching element (Sa) can be connected to the other end (nb) of the output terminal (na-nb) of the ac / dc converter (905).

[0318] One end (cathode) of the second diode element (Db) is connected to one end (na) of the output terminal (na-nb) of the ac / dc converter (905), and the other end (anode) of the second diode element (Db) can be connected to the second node (nd).

[0319] One end of the second switching element (Sb) is connected to the second node (nd), and the other end of the second switching element (Sb) can be connected to the other end (nb) of the output terminal (na-nb) of the ac / dc converter (905).

[0320] Meanwhile, the AC / DC converter (905) of FIG. 10a can be named as a hybrid bridge type AC / DC converter.

[0321] Meanwhile, the AC / DC converter (905) may further include an inductor (L) positioned between a first node (na) between a first diode element (Da) and a first switching element (Sa) and an input terminal to which an input AC voltage (Vac) is input.

[0322] Meanwhile, a DC / DC converter (907) connected to both ends of a DC capacitor (Ca) may be connected to the output terminal (nc-nd) of the AC / DC converter (905).

[0323] FIG. 10b illustrates an example of the DC / DC converter (907) of FIG. 7 and FIG. 8.

[0324] Referring to the drawing, the DC / DC converter (907) can convert the level of the DC voltage from the AC / DC converter (905).

[0325] For example, the DC / DC converter (907) may be a buck converter that converts the level of DC voltage from the AC / DC converter (905).

[0326] That is, the DC / DC converter (907) may be equipped with a switching element (Sbc) connected to the na node, a diode element (Dc) connected between the other end of the switching element (Sbc) and the nb node, an inductor (Lc) connected to the anode of the diode element (Dc), and a capacitor (Cc) connected to the other end of the inductor (Lc).

[0327] That is, a switching element (Sbc) may be connected between the na node and the nc node, an inductor (Lc) may be connected between the nc node and the nia node, a capacitor (Cc) may be connected between the nia node and the nib node, and a diode element (Dc) may be connected between the nc node and the nb node.

[0328] Meanwhile, when the switching element (Sbc) is turned on, current flows through the switching element (Sbc) and the inductor (Lc), and when the switching element (Sbc) is turned off, current flows through the diode element (Dc) and the switching element (Sbc). Accordingly, a level-converted DC voltage is output.

[0329] FIG. 10c illustrates a wireless power transmission device (20) of FIG. 7 and FIG. 8 and an example of a wireless power transmission device (20).

[0330] Referring to the drawing, the wireless power transmission device (20) has a transmission coil (CLa) and an inverter (712) connected to the transmission coil (CLa) by having a plurality of switching elements (Sm1 to Sm4).

[0331] Meanwhile, the inverter (712) comprises a fifth switching element (Sm1) and a sixth switching element (Sm2) connected in series with each other within a fifth leg (legma), and a seventh switching element (Sm3) and an eighth switching element (Sm4) connected in series with each other within a sixth leg (legmb) connected in parallel with the fifth leg (legma).

[0332] Meanwhile, the wireless power transmission device (20) has a receiving coil (CLb) and a rectifier (722) connected to the receiving coil (CLb).

[0333] Meanwhile, the rectifier (722) may be equipped with a third diode element (D1) and a fourth diode element (D2) connected in series with each other within the seventh leg (legmc), and a fifth diode element (D3) and a sixth diode element (D4) connected in series with each other within the eighth leg (legmd) connected in parallel with the seventh leg (legmc).

[0334] FIG. 11 is an example of a circuit diagram of a DC / DC converter in a power supply unit according to an embodiment of the present disclosure.

[0335] Referring to the drawings, the DC / DC converter (910) in the power supply unit (190) according to an embodiment of the present disclosure includes a full bridge switching unit (921), a transformer (905) connected to the output terminal of the full bridge switching unit (921), and a rectifier (925) connected to the output terminal of the transformer (905).

[0336] Meanwhile, the full bridge switching unit (921) comprises a first switching element (S1) and a second switching element (S2) connected in series with each other within a first leg (lego), and a third switching element (S3) and a fourth switching element (S4) connected in series with each other within a second leg (legp) connected in parallel with the first leg (lego).

[0337] Meanwhile, the DC / DC converter (910) in the power supply unit (190) according to the embodiment of the present disclosure may further include a resonant capacitor (Cr) and a resonant inductor (Lr) connected between the DC / DC converter (910) and the transformer (905). Accordingly, the DC / DC converter (910) is an LLC-based resonant DC / DC converter and can supply a display driving voltage by utilizing resonance.

[0338] In particular, the display driving voltage can be output through the Toa terminal in the drawing. Meanwhile, the Tob terminal may be a ground terminal.

[0339] Meanwhile, the DC / DC converter (910) in the power supply unit (190) according to the embodiment of the present disclosure may further include a multi-level voltage output circuit (935) that is connected to the output terminal of the rectifier unit (925) and outputs a plurality of display driving voltages according to a plurality of display modes.

[0340] Meanwhile, the DC / DC converter (910) may further include a capacitor (Co) placed between the output terminal (No-Ng) of the transformer (905) and the multi-level voltage output circuit (935).

[0341] Meanwhile, the multi-level voltage output circuit (935) according to an embodiment of the present disclosure includes a first resistor element (R1) and a second resistor element (R2) connected in series to each other at the output terminal (No-Ng) of the transformer (905), a third resistor element (R3) and a ninth switching element (SWa) connected in series to each other and arranged in a ninth leg (legna) connected in parallel to both ends of the second resistor element (R2), and a fourth resistor element (R4) and a tenth switching element (SWb) connected in series to each other and arranged in a tenth leg (legnb) connected in parallel to both ends of the second resistor element (R2).

[0342] That is, a third resistor element (R3) and a ninth switching element (SWa) are connected in series and arranged in the first leg between the nm terminal and the Ng terminal, which are the two ends of the second resistor element (R2).

[0343] Meanwhile, a fourth resistor element (R4) and a tenth switching element (SWb) are connected in series and arranged in the second leg between the nm terminal and the Ng terminal, which are the two ends of the second resistor element (R2).

[0344] Meanwhile, the power supply unit (190) can output a display driving voltage of the third level (LV1), a display driving voltage of the fourth level (LV2), or a display driving voltage of the fifth level (LV3) based on the on or off of the ninth switching element (SWa) or the tenth switching element (SWb).

[0345] For example, the power supply unit (190) can output a display driving voltage of the third level (LV1) when both the ninth switching element (SWa) and the tenth switching element (SWb) are turned off in the first mode.

[0346] As another example, the power supply unit (190) can output a display driving voltage of the fourth level (LV2) when, in the second mode, only one of the ninth switching element (SWa) and the tenth switching element (SWb) is turned on and the other is turned off.

[0347] As another example, the power supply unit (190) can output a display driving voltage of the 5th level (LV3) when both the 9th switching element (SWa) and the 10th switching element (SWb) are turned on in the 3rd mode. Accordingly, it is possible to reduce heat generation by supplying various display driving voltages.

[0348] Meanwhile, the DC / DC converter (910) may further include a voltage detection unit (915) that detects a display driving voltage output from the output terminal (No-Ng) of the transformer (905), and a control unit (770) that controls the first to fourth switching elements (S1~S4) based on the voltage detected by the voltage detection unit (915).

[0349] Meanwhile, the voltage detection unit (915) may include a regulator (SRa) electrically connected to one end of the second resistor element (R2) and a photocoupler (PTD) electrically connected to the regulator (SRa) to transmit the voltage between the two ends of the second resistor element (R2) to the control unit (770). Accordingly, based on the feedback of the voltage between the two ends of the second resistor element (R2), various display driving voltages can be supplied to reduce heat generation.

[0350] Meanwhile, the voltage detection unit (915) detects the voltage across the second resistor element (R2) (nm-Ng), and the control unit (770) can control the voltage at the output terminal (No-Ng) of the transformer (905) to increase as the voltage across the second resistor element (R2) decreases.

[0351] Meanwhile, the voltage detection unit (915) detects the voltage across the second resistor element (R2) (nm-Ng), and the control unit (770) can control the voltage at the output terminal (No-Ng) of the transformer (905) to decrease as the voltage across the second resistor element (R2) increases.

[0352] For example, the control unit (770) can control the first to fourth switching elements (S1 to S4) such that when the voltage detected by the voltage detection unit (915) during the first mode operation is lower than the first reference voltage corresponding to the first mode, the voltage detected by the voltage detection unit (915) reaches the first reference voltage.

[0353] Specifically, the control unit (770) can control the turn-on duty of the first to fourth switching elements (S1 to S4) to increase when, during the first mode operation, the voltage detected by the voltage detection unit (915) is lower than the first reference voltage corresponding to the first mode. Accordingly, the display driving voltage corresponding to the first mode can be supplied.

[0354] As another example, the control unit (770) can control the first to fourth switching elements (S1 to S4) such that when the voltage detected by the voltage detection unit (915) during the first mode operation is higher than the first reference voltage corresponding to the first mode, the voltage detected by the voltage detection unit (915) reaches the first reference voltage.

[0355] Specifically, the control unit (770) can control the turn-on duty of the first to fourth switching elements (S1 to S4) to decrease when the voltage detected by the voltage detection unit (915) during the first mode operation is higher than the first reference voltage corresponding to the first mode. Accordingly, the display driving voltage corresponding to the first mode can be supplied.

[0356] Meanwhile, the control unit (770) can control the first to fourth switching elements (S1 to S4) so ​​that when the voltage detected by the voltage detection unit (915) is lower than the second reference voltage corresponding to the second mode, the voltage detected by the voltage detection unit (915) reaches the second reference voltage. Accordingly, the display driving voltage corresponding to the second mode can be supplied.

[0357] Meanwhile, the control unit (770) can control the first to fourth switching elements (S1 to S4) so ​​that when the voltage detected by the voltage detection unit (915) is lower than the third reference voltage corresponding to the third mode, the voltage detected by the voltage detection unit (915) reaches the third reference voltage. Accordingly, the display driving voltage corresponding to the third mode can be supplied.

[0358] FIGS. 12a to 12e are drawings referenced in the description of FIG. 11.

[0359] Figure 12a is a diagram illustrating various levels of display driving voltage.

[0360] Referring to the drawing, the power supply unit (190) can output a display driving voltage of any one of the display driving voltages of the third level (LV1), the display driving voltage of the fourth level (LV2), or the display driving voltage of the fifth level (LV3).

[0361] Meanwhile, it is desirable that the difference (Vb) between the 5th level (LV3) and the 4th level (LV2) is greater than the difference (Va) between the 4th level (LV2) and the 3rd level (LV1).

[0362] For example, the display driving voltage of the third level (LV1) may be approximately 22V, the display driving voltage of the fourth level (LV2) may be approximately 24V, and the display driving voltage of the fifth level (LV3) may be approximately 28V.

[0363] FIG. 12b is a diagram illustrating the multi-level voltage output circuit (935) of FIG. 11.

[0364] Referring to the drawing, the multi-level voltage output circuit (935) includes a first resistor element (R1) and a second resistor element (R2) connected in series to each other at the output terminal (No, Ng) of the transformer (905), a third resistor element (R3) and a ninth switching element (SWa) connected in series to each other within a ninth leg (legna) connected in parallel to both ends of the second resistor element (R2), and a fourth resistor element (R4) and a tenth switching element (SWb) connected in series to each other within a tenth leg (legnb) connected in parallel to both ends of the second resistor element (R2).

[0365] Meanwhile, the voltage detection unit (915) includes a regulator (SRa) electrically connected to one end of the second resistor element (R2) and a photocoupler (PTD) electrically connected to the regulator (SRa) and transmitting the voltage between the two ends of the second resistor element (R2) to the control unit (770).

[0366] At this time, the photocoupler (PTD) can be placed between one end (No) of the first resistor element and the regulator (SRa), as shown in the drawing.

[0367] The voltage detection unit (915) can transmit the detected current or the detected voltage to the control unit (770) based on the conduction of the photocoupler (PTD).

[0368] FIGS. 12c to 12e are drawings illustrating the operation of a multi-level voltage output circuit (935) in the first to third modes.

[0369] FIG. 12c illustrates a third mode in which both the ninth switching element (SWa) and the tenth switching element (SWb) are turned on.

[0370] FIG. 12d illustrates a second mode in which only one of the ninth switching element (SWa) and the tenth switching element (SWb) is turned on.

[0371] FIG. 12e illustrates that, as a first mode, both the ninth switching element (SWa) and the tenth switching element (SWb) are turned off.

[0372] For example, the explanation assumes that the resistance values ​​of the first to fourth resistor elements are each 2KΩ.

[0373] In the first mode, since both the ninth switching element (SWa) and the tenth switching element (SWb) are turned off, the total resistance value becomes approximately 4KΩ due to the first resistor element and the second resistor element.

[0374] In the second mode, since only one of the ninth switching element (SWa) and the tenth switching element (SWb) is turned on, the resistance value across the second resistor element becomes 1KΩ, and considering the first resistor element, the total resistance value becomes approximately 3KΩ.

[0375] In the third mode, since both the ninth switching element (SWa) and the tenth switching element (SWb) are turned on, the resistance value across the second resistor element becomes 0.67KΩ, and considering the first resistor element, the total resistance value becomes approximately 2.67KΩ.

[0376] Ultimately, the total resistance value in the first mode becomes the largest, and the total resistance value in the third mode becomes the smallest.

[0377] The power supply unit (190) outputs a display driving voltage of the third level (LV1), a display driving voltage of the fourth level (LV2), or a display driving voltage of the fifth level (LV3) by utilizing the difference in the total resistance value within the multi-level voltage output circuit (935) in the first to third modes.

[0378] Accordingly, by supplying various display driving voltages in various modes, it becomes possible to stably display images in various modes.

[0379] FIG. 13 is a flowchart illustrating the operation method of an image display device according to an embodiment of the present disclosure.

[0380] Referring to the drawings, the signal processing device (170) of the image display device (100) according to an embodiment of the present disclosure can control the output of a display driving voltage of a corresponding mode according to a selected mode among a first mode to a third mode displayed in a setting screen.

[0381] First, the signal processing unit (170) of the image display device (100) determines whether the first mode is set (S1105), and if applicable, controls the power supply unit (190) to output a display driving voltage of the third level (LV1) (S1110).

[0382] Meanwhile, the signal processing device (170) of the image display device (100) determines whether the second mode is set when the first mode is not set (S1115), and if applicable, controls the power supply unit (190) to output a display driving voltage of the fourth level (LV2) (S1120).

[0383] Meanwhile, the signal processing device (170) of the image display device (100) determines whether the third mode is set when the second mode is not set (S1125), and if applicable, controls the power supply unit (190) to output a display driving voltage of the fifth level (LV3) (S1130).

[0384] The first mode at this time may be a first display mode or a first brightness mode.

[0385] Accordingly, heat generation can be reduced by supplying various display driving voltages.

[0386] FIGS. 14a to 14c are drawings referenced in the description of FIG. 13.

[0387] FIG. 14a illustrates that the High Dynamic Range Mode item (1212) is selected as the video output mode within the settings screen (1210) displayed on the display (180).

[0388] The signal processing device (170) controls the high dynamic range mode to be performed as an image output mode when the high dynamic range mode item (1212) is selected based on the remote control signal.

[0389] To this end, the signal processing device (170) can transmit a third mode selection signal to the power supply unit (190).

[0390] Meanwhile, the power supply unit (190) receives a third mode selection signal from the signal processing unit (170) when the image output mode of the signal processing unit (170) is a high dynamic range mode, and can output a display driving voltage of the fifth level (LV3) based on the third mode selection signal. Accordingly, a display driving voltage corresponding to the high dynamic range mode can be supplied, and consequently, heat generation can be reduced.

[0391] FIG. 14b illustrates that a first display mode item (1222), a second display mode item (1224), and a third display mode item (1226) are displayed within a setting screen (1220) displayed on a display (1800).

[0392] The first display mode can correspond to the display power control (DPC) on mode.

[0393] The second display mode can correspond to a display power control (DPC) off mode.

[0394] The third display mode can correspond to Peak on mode.

[0395] Meanwhile, the signal processing device (170) can control the power supply unit (190) to supply a display driving voltage of a third level (LV1) to the display (180)0) based on the first mode when a first display mode item (1222) corresponding to the display power control ON mode is selected within the setting screen (1220).

[0396] Meanwhile, the signal processing device (170) can control the power supply unit (190) to supply a display driving voltage of the fourth level (LV2) to the display (180) based on the second mode when a second display mode item (1224) corresponding to the display power control off mode is selected within the setting screen (1220).

[0397] Meanwhile, the signal processing device (170) can control the power supply unit (190) to supply a display driving voltage of the fifth level (LV3) to the display (180) based on the third mode when a third display mode item (1226) corresponding to the peak-on mode is selected within the setting screen (1220).

[0398] FIG. 14c illustrates that a first brightness mode item (1232), a second brightness mode item (1234), and a third brightness mode item (1236) are displayed within a setting screen (1230) displayed on a display (1800).

[0399] The first brightness mode can correspond to the Eco mode or Standard mode among the video output modes.

[0400] The second brightness mode can correspond to the movie mode or game mode among the video output modes.

[0401] The third brightness mode can correspond to the high dynamic range mode among the video output modes.

[0402] Meanwhile, the signal processing device (170) can control the power supply unit (190) to supply a display driving voltage of a third level (LV1) to the display (180)0) based on the first mode when a first brightness mode item (1232) corresponding to an eco mode or standard mode is selected within the setting screen (1230).

[0403] Meanwhile, the signal processing device (170) can control the power supply unit (190) to supply a display driving voltage of a fourth level (LV2) to the display (180) based on the second mode when a second brightness mode item (1234) corresponding to a movie mode or a game mode is selected within the setting screen (1230).

[0404] Meanwhile, the signal processing device (170) can control the power supply unit (190) to supply a display driving voltage of the fifth level (LV3) to the display (180) based on the third mode when a third brightness mode item (1236) corresponding to the high dynamic range mode is selected within the setting screen (1230).

[0405] Meanwhile, the power supply unit (190) according to the embodiment of the present disclosure varies the level of the display driving voltage based on the image output mode of the signal processing device (170).

[0406] For example, the control unit (770) within the power supply unit (190) can control the signal processing unit (170) to output a first display driving voltage when the video output mode is an eco mode or a standard mode, and to output a second display driving voltage higher than the first display driving voltage when the video output mode of the signal processing unit (170) is a movie mode or a game mode.

[0407] As another example, the control unit (770) within the power supply unit (190) can control the signal processing device (170) to output a third display driving voltage higher than the second display driving voltage when the image output mode of the signal processing device (170) is the high dynamic range mode. Accordingly, various display driving voltages can be stably output in various modes, thereby enabling stable image display.

[0408] FIG. 15 is an example of a flowchart illustrating the operation method of a wireless power transmission device and a wireless power receiving device according to an embodiment of the present disclosure.

[0409] Referring to the drawing, the wireless power transmission device (20) can convert the input AC voltage (Vac) into a DC voltage after power is turned on, and can establish a communication connection with the wireless power receiving device (30) based on the converted DC voltage (S1210).

[0410] For example, the communication unit (716) of the wireless power transmission device (20) can connect to the communication unit (726) in the wireless power receiving device (30) via Bluetooth communication and perform pairing.

[0411] Meanwhile, the communication unit (726) within the wireless power receiving device (30) receives a connection request from the communication unit (716) to the wireless power transmitting device (20), and can perform a communication connection based on the connection request (S1211).

[0412] That is, the communication unit (726) within the wireless power receiving device (30) receives a connection request from the communication unit (716) to the wireless power transmitting device (20), and can perform pairing based on the connection request.

[0413] Meanwhile, the wireless power transmission device (20) can convert the input AC voltage (Vac) into a DC voltage after power is turned on, and perform wireless power transmission based on the converted DC voltage.

[0414] In response to this, the wireless power receiving device (30) receives wireless power, outputs a first DC voltage (Vrc) based on the received power, converts the DC voltage based on the first DC voltage (Vrc), and supplies the converted DC voltage to each unit, including the communication unit (726).

[0415] Meanwhile, the power supply unit (190) can detect a first DC voltage input to the DC / DC converter (910) through an input voltage detection unit (DA), or detect a display driving voltage (Vdd) output to the DC / DC converter (910) through an output voltage detection unit (DD).

[0416] Next, the communication unit (726) within the wireless power receiving device (30) can transmit voltage information to the wireless power transmitting device (20) via the communication unit (716) (S1215).

[0417] In response to this, the communication unit (716) in the wireless power transmission device (20) can receive voltage information from the communication unit (726) in the wireless power receiving device (30) (S1216).

[0418] The voltage information at this time may be voltage information for the first DC voltage or voltage information for the display driving voltage.

[0419] Meanwhile, the processor (714) in the wireless power transmission device (20) can vary the wireless power based on voltage information for the first DC voltage or voltage information for the display driving voltage, and transmit the varied wireless power (S1220).

[0420] In response to this, the wireless power receiving device (30) can receive variable wireless power (S1221).

[0421] For example, the processor (714) in the wireless power receiving device (30) can control the transmitted wireless power to decrease as the voltage information for the first DC voltage is greater than or equal to the first reference value and the difference from the first reference value increases.

[0422] As another example, the processor (714) in the wireless power receiving device (30) can control the transmitted wireless power to increase as the voltage information for the first DC voltage is less than the first reference value and the difference from the first reference value increases.

[0423] Meanwhile, the processor (714) in the wireless power receiving device (30) can control the transmitted wireless power to decrease as the voltage information for the display driving voltage is greater than or equal to the second reference value and the difference from the second reference value increases.

[0424] As another example, the processor (714) in the wireless power receiving device (30) can control the transmitted wireless power to increase as the voltage information for the display driving voltage is less than the second reference value and the difference from the second reference value increases.

[0425] Next, the DC / DC converter (910) in the power supply unit (190) can convert the first DC voltage output from the wireless power receiving device (30) to output a display driving voltage (Vdd).

[0426] Meanwhile, the control unit (770) within the power supply unit (190) determines whether operation in phase shift mode of the DC / DC converter (910) is required (S1221), and if applicable, can control operation in phase shift mode.

[0427] That is, the control unit (770) in the power supply unit (190) can control the first switching element (S1) and the fourth switching element (S4) among the plurality of switching elements (S1~S4) in the DC / DC converter (910) to overlap a portion of the turn-on period based on the phase shift mode (S1230).

[0428] In particular, the control unit (770) within the power supply unit (190) varies the overlap period of the first switching element (S1) and the fourth switching element (S4) when they turn on, depending on the level of the first DC voltage (Vrc).

[0429] For example, the control unit (770) within the power supply unit (190) controls the first DC voltage (Vrc) to be at a first level so that the overlap period when the first switching element (S1) and the fourth switching element (S4) turn on becomes a first period, and when the first DC voltage (Vrc) is at a second level greater than the first level, controls the first switching element (S1) and the fourth switching element (S4) to be at a second period smaller than the first period. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the first DC voltage (Vrc).

[0430] Meanwhile, in step 1221 (S1221), the control unit (770) within the power supply unit (190) can vary the switching frequency of the first to fourth switching elements (S1~S4), and control them to operate in a phase shift mode when the switching frequency is greater than or equal to the reference frequency.

[0431] Meanwhile, the control unit (770) within the power supply unit (190) can vary the switching frequency of the first to fourth switching elements (S1 to S4), and control the switching frequency so that it does not operate in phase shift mode when the switching frequency is less than the reference frequency.

[0432] That is, the control unit (770) within the power supply unit (190) can control the first switching element (S1) and the fourth switching element (S4) so ​​that their turn-on periods overlap when the switching frequency is less than the reference frequency. Accordingly, it is possible to stably display an image based on wireless power transmission.

[0433] Meanwhile, the control unit (770) within the power supply unit (190) can control the reference frequency to increase as the level of the display driving voltage (Vdd) decreases. Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the level of the display driving voltage (Vdd).

[0434] Alternatively, in step 1221 (S1221), the control unit (770) within the power supply unit (190) controls the first to fourth switching elements (S1 to S4) to perform zero-voltage switching, and while the first to fourth switching elements (S1 to S4) are performing zero-voltage switching, if the first to fourth switching elements (S1 to S4) are unable to perform zero-voltage switching and the power consumed by the first to fourth switching elements (S1 to S4) exceeds an allowable range, the control unit may be controlled to operate in a phase shift mode.

[0435] Meanwhile, the control unit (770) within the power supply unit (190) can control the first to fourth switching elements (S1 to S4) to perform zero-voltage switching, and control the wireless power transmitted from the wireless power transmission device (20) to be variable based on the zero-voltage switching.

[0436] For example, if zero-voltage switching is not performed by the first to fourth switching elements (S1 to S4) and the power consumed by the first to fourth switching elements (S1 to S4) exceeds the allowable range, the communication unit (726) in the wireless power receiving device (30) can transmit voltage information for variable wireless power to the wireless power transmission device (20) via the communication unit (716) (S1215).

[0437] Accordingly, the wireless power transmission device (20) can vary the wireless power, and consequently, the first to fourth switching elements (S1 to S4) can perform zero-voltage switching based on the variable wireless power.

[0438] Meanwhile, a control unit (770) within a power supply unit (190) according to another embodiment of the present disclosure performs a phase shift mode in response to fluctuations in a first DC voltage (Vrc) output from a wireless power receiving device (30), and when the phase shift mode is operated, the overlap period of turning on some of the switching elements (S1, S4) among the plurality of switching elements (S1~S4) in the DC / DC converter (910) varies according to the level of the first DC voltage (Vrc). Accordingly, it is possible to stably display an image based on wireless power transmission. In particular, it is possible to stably display an image in response to fluctuations in the DC voltage received from the wireless power receiving device (30).

[0439] Figure 16 is a drawing referenced in the description of Figure 15.

[0440] Specifically, FIG. 16 is a diagram illustrating a gain corresponding to the operating frequency of a plurality of switching elements (S1 to S4) in a DC / DC converter (910).

[0441] Referring to the drawing, the control unit (770) within the power supply unit (190) can vary the switching frequency within a variable range (THa~THb) of the switching frequency based on the gain graph (GRap) relative to the operating frequency.

[0442] For example, THa is approximately 100KHz, and THb can be approximately 200KHz.

[0443] Meanwhile, if the switching frequency is less than the lower limit standard THa, the voltage gain of the DC / DC converter (910) is low and therefore undesirable, and if the switching frequency is greater than the upper limit standard THb, it is undesirable due to reduced efficiency and heat generation.

[0444] Meanwhile, the control unit (770) within the power supply unit (190) can vary the switching frequency of the first to fourth switching elements (S1 to S4) within a first range, and control them to operate in a phase shift mode when the switching frequency is greater than or equal to a reference frequency within the first range.

[0445] Meanwhile, the control unit (770) within the power supply unit (190) can vary the first range or reference frequency according to the display mode.

[0446] For example, the control unit (770) within the power supply unit (190) can control the first range or reference frequency to be larger when the display power control on mode corresponding to the first display mode is greater than when the display power control off mode corresponding to the second display mode is greater.

[0447] In the case of a display power control off mode corresponding to a second display mode, the control unit (770) within the power supply unit (190) can set a first range (RGa) for varying the switching frequency to f1 to f3.

[0448] And, the control unit (770) within the power supply unit (190) can be controlled to operate in a phase shift mode as described above when the switching frequency is greater than or equal to the reference frequency (fr1) within the first range (RGa) while in a state of the display power control off mode corresponding to the second display mode. Accordingly, an image can be stably displayed based on wireless power transmission.

[0449] Meanwhile, the control unit (770) within the power supply unit (190) can be controlled so that it does not operate in phase shift mode when the switching frequency is less than the reference frequency (fr1) within the first range (RGa) while in a display power control off mode corresponding to the second display mode. That is, it can be controlled to operate in LCC mode in which the turn-on periods of the first switching element (S1) and the fourth switching element (S4) are all overlapped.

[0450] Meanwhile, the control unit (770) within the power supply unit (190) can set the first range (RGb) for varying the switching frequency to f2 to f4 when the display power control on mode corresponding to the first display mode is in place.

[0451] In this case, it is desirable that f2 is greater than f1 and f4 is greater than f3.

[0452] And, the control unit (770) within the power supply unit (190) can be controlled to operate in a phase shift mode as described above when the switching frequency is greater than or equal to the reference frequency (fr2) within the first range (RGb) while in a display power control on mode corresponding to the first display mode. Accordingly, an image can be stably displayed based on wireless power transmission.

[0453] In this case, it is desirable that fr2 be larger than fr1.

[0454] Meanwhile, the control unit (770) within the power supply unit (190) can be controlled so that it does not operate in phase shift mode when the switching frequency is less than the reference frequency (fr2) within the first range (RGb) while in a display power control on mode corresponding to the first display mode. That is, it can be controlled to operate in LCC mode.

[0455] Meanwhile, the control unit (770) within the power supply unit (190) can control the power to be turned off when the switching frequency of the first to fourth switching elements (S1 to S4) deviates from the first range (RGa or RGb). Accordingly, it is possible to stably display images based on wireless power transmission.

[0456] Meanwhile, the wireless power transmission device (20) forms a magnetic field for wireless power to the wireless power receiving device (30), and can control the magnetic field strength in the side areas (ARea, Areb in FIG. 18) to be greater than that in the central area (ARct in FIG. 18). Accordingly, stable wireless power transmission becomes possible.

[0457] To this end, the transmission coil (CLa) in the wireless power transmission device (20) may be equipped with a central region core, an edge region core, a wire wound around the central region core, and a wire wound around the edge region core.

[0458] At this time, it is desirable that the height of the edge region core is greater than the height of the central region core.

[0459] Meanwhile, the length of the transmission coil (CLa) in the wireless power transmission device (20) is smaller than the length of the display (180) and is preferably larger than half the length of the display (180).

[0460] Meanwhile, the receiving coil (CLb) in the wireless power receiving device (30) may be equipped with a core and a wire wound around the core.

[0461] Meanwhile, it is preferable that the wire wound around the core within the receiving coil (CLb) be more densely packed in the side area (not shown) than in the central area (not shown).

[0462] Alternatively, it is preferable that the height of the core within the receiving coil (CLb) be higher in the side area (not shown) than in the central area (not shown).

[0463] Meanwhile, the length of the receiving coil (CLb) in the wireless power receiving device (30) is smaller than the length of the display (180) and is preferably larger than half the length of the display (180).

[0464] Accordingly, the magnetic field strength in the side area (not shown) becomes greater than in the central area (not shown), and consequently, stable wireless power transmission becomes possible centered on the side area (not shown).

[0465] FIG. 17 is a drawing illustrating an image display device according to another embodiment of the present disclosure.

[0466] Referring to the drawings, an image display device (100b) according to another embodiment of the present disclosure is similar to the image display device (100b) of FIG. 1, but differs in that it additionally includes a wireless media device (300).

[0467] That is, a video display device (100b) according to another embodiment of the present disclosure comprises a wireless power transmission device (20) that transmits power wirelessly, a wireless power receiving device (30) that receives wireless power from the wireless power transmission device (20), a wireless media device (300) that transmits a video signal or audio signal wirelessly in an uncompressed manner, and a display (180).

[0468] In the drawing, a wireless power transmission device (20) is positioned at the bottom of a support frame (FR), and a wireless power receiving device (30) is positioned at the top of the wireless power transmission device (20) and spaced apart from the wireless power transmission device (20).

[0469] Meanwhile, the wireless power transmission device (20) can be placed at the bottom of the display (180).

[0470] Meanwhile, the wireless power transmission device (20) and the display (180) are provided within the display device (50b), and the display device (50b) can be supported by a support frame (FR).

[0471] Meanwhile, the wireless media device (300) is spaced apart from the support frame (FR).

[0472] In order to secure a stable wireless bandwidth, when a video signal or audio signal is transmitted uncompressed from a wireless media device (300) to a display device (50b), the wireless media device (300) can transmit media data to the display device (50b) using a 60GHz-based frequency.

[0473] For example, a wireless media device (300) within a video display device (100b) can transmit a video signal or an audio signal to a display device (50b) based on wireless communication based on the 802.11 ad / ay standard.

[0474] FIG. 18 is an example of an internal block diagram of the image display device of FIG. 17.

[0475] Referring to the drawings, an image display device (100b) according to another embodiment of the present disclosure comprises a wireless media device (300), a display device (50b), and a wireless power transmission device (20) that transmits power wirelessly.

[0476] The wireless media device (300) may be equipped with a video receiving unit (105), a memory (140), a power supply unit (190), a signal processing unit (170), and a communication device (160a).

[0477] The display device (50b) may include a second communication device (160b), a user input interface unit (150), a display (180), an audio output unit (185), and a power supply unit (195).

[0478] Meanwhile, the display device (50b) may further include a wireless power receiving device (30) that receives wireless power from the wireless power transmission device (20).

[0479] The communication device (160a) can perform wireless communication with the second communication device (160b) within the display device (50b).

[0480] The second communication device (160b) can perform wireless communication with the communication device (160a) within the wireless media device (300).

[0481] The video signal and audio signal received from the second communication device (160b) can be transmitted to the display (180) and audio output unit (185), respectively.

[0482] Meanwhile, the operation of the wireless power transmission device (20) and the wireless power receiving device (30) of FIGS. 17 to 18 may correspond to FIGS. 7 to 16.

[0483] Meanwhile, the operation of the DC / DC converter (910) in the power supply unit (190) of FIGS. 7 to 16 can correspond to the operation of the DC / DC converter (not shown) in the power supply unit (195) of FIGS. 17 to 18.

[0484] Although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure.

Claims

1. A wireless power transmission device that transmits power wirelessly; A wireless power receiving device that receives wireless power from the above wireless power transmission device; A DC / DC converter that converts a first DC voltage from the above-mentioned wireless power receiving device and outputs a display driving voltage; A control unit for controlling the above-mentioned DC / DC converter; A display that operates based on the above-mentioned display driving voltage; including The above DC / DC converter is, A first switching element and a second switching element connected in series with each other within a first leg; and a third switching element and a fourth switching element connected in series with each other within a second leg connected in parallel with the first leg; are provided. The above control unit is, When operating in phase shift mode, a portion of the turn-on period of the first switching element and the fourth switching element is overlapped, and An image display device that varies the overlap period of the first switching element and the fourth switching element when turned on according to the level of the first DC voltage.

2. In Paragraph 1, The above control unit is, When the first DC voltage is at the first level, the overlap period during the turn-on of the first switching element and the fourth switching element is controlled to be the first period, and An image display device that controls the overlapping period of the first switching element and the fourth switching element when they turn on to be a second period smaller than the first period when the first DC voltage is a second level greater than the first level.

3. In Paragraph 1, The above control unit is, An image display device that, when operating in the above phase shift mode, increases the overlap period between the turn-on of the first switching element and the fourth switching element as the level of the first DC voltage decreases.

4. In Paragraph 1, The above control unit is, When the level of the display driving voltage is at the third level, the overlap period during the turn-on of the first switching element and the fourth switching element is controlled to be the third period, and An image display device that, when the level of the display driving voltage is a fourth level greater than the third level, controls the overlapping period of the first switching element and the fourth switching element when they turn on to be a fourth period greater than the third period.

5. The above control unit is, An image display device that increases the overlap period of the first switching element and the fourth switching element when they turn on as the level of the display driving voltage increases.

6. In Paragraph 1, The above control unit is, When the distance between the wireless power transmission device and the wireless power transmission device is a first distance, the overlap period when the first switching element and the fourth switching element are turned on is controlled to be a fifth period, and A video display device that controls the overlapping period of the first switching element and the fourth switching element when they turn on to be a sixth period greater than the fifth period when the distance between the wireless power transmission device and the wireless power transmission device is a second distance greater than the first distance.

7. In Paragraph 1, The above control unit is, An image display device that increases the overlap period of the first switching element and the fourth switching element when turned on as the distance between the wireless power transmission device and the wireless power transmission device increases.

8. In Paragraph 1, The above control unit is, When the level of the first DC voltage is above a reference level, control to operate in the phase shift mode, and An image display device that controls the turn-on periods of the first switching element and the fourth switching element to overlap when the level of the first DC voltage is below the reference level.

9. In Paragraph 1, The above control unit is, The switching frequency of the first to fourth switching elements is varied, When the above switching frequency is greater than or equal to the reference frequency, control to operate in the above phase shift mode, and An image display device that controls the turn-on periods of the first switching element and the fourth switching element to overlap when the switching frequency is less than the reference frequency.

10. In Paragraph 9, The above control unit is, An image display device that controls the reference frequency to increase as the level of the display driving voltage decreases.

11. In Paragraph 1, The above control unit is, The switching frequency of the first to fourth switching elements is varied within a first range, An image display device that controls operation to the phase shift mode when the switching frequency is greater than or equal to a reference frequency within the first range.

12. In Paragraph 1, The above control unit is, Controls the first to fourth switching elements to perform zero-voltage switching, and An image display device that controls the first to fourth switching elements to operate in the phase shift mode while performing the zero-voltage switching.

13. In Paragraph 12, The above control unit is, Controls the first to fourth switching elements to perform zero-voltage switching, and A video display device that controls the wireless power transmitted from the wireless power transmission device to be variable based on the above zero-voltage switching.

14. In Paragraph 1, The above control unit is, A video display device that controls the power to be turned off when the level of the first DC voltage is below a lower limit level or above an upper limit level.

15. In Paragraph 1, A signal processing device that outputs a video signal to the above display; further comprising, The above control unit is, When the image output mode of the above signal processing device is an eco mode or a standard mode, a first display driving voltage is output, and A video display device that outputs a second display driving voltage higher than the first display driving voltage when the video output mode of the signal processing device is a movie mode or a game mode.

16. In Paragraph 15, The above control unit is, A video display device that outputs a third display driving voltage higher than the second display driving voltage when the video output mode of the signal processing device is a high dynamic range mode.

17. In Paragraph 1, The above DC / DC converter is, A transformer having an input terminal connected to the output terminal of the plurality of switching elements; A video display device further comprising a rectifier disposed at the output terminal of the above transformer.

18. In Paragraph 17, The above DC / DC converter is, An image display device further comprising: a multi-level voltage output circuit connected to the output terminal of the above-mentioned rectifier and outputting a plurality of display driving voltages according to a plurality of display modes.

19. Wireless power transmission device for transmitting power wirelessly; A wireless power receiving device that receives wireless power from the above wireless power transmission device; A DC / DC converter having a plurality of switching elements and converting a first DC voltage from the wireless power receiving device to output a display driving voltage; A control unit for controlling the above-mentioned DC / DC converter; A display that operates based on the above-mentioned display driving voltage; including The above control unit is, An image display device that performs a phase shift mode in response to a fluctuation of the first DC voltage, and, when the phase shift mode is operated, varies the overlap period of the turn-on of some of the switching elements among the plurality of switching elements according to the level of the first DC voltage.

Images