Image display device

Abstract

The present disclosure relates to an image display device. The image display apparatus according to one embodiment of the present disclosure comprises: a display; a signal processing device for outputting an image signal to the display; and a power source supply unit including a converter for supplying a display driving voltage to the display, wherein the converter includes: a transformer; a first switching element and a second switching element arranged at an input end of the transformer and connected in series to each other; each of a resonance capacitor and a resonance inductor connected between the input end of the transformer and the second switching element; and a switching control unit for controlling the first switching element and the second switching element, and the switching control unit controls that the switching of the first switching element and the second switching element stop if the current flowing through the resonance inductor decreases while the switching frequencies of the first switching element and the second switching element decrease. Therefore, the possibility of circuit element burnout can be reduced.

Description

Video display device

[0001] The present disclosure relates to an image display device, and more particularly, to an image display device capable of reducing the possibility of damage to circuit elements when an input voltage momentarily increases.

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

[0003] In response to the recent increase in image resolution and image clarity, this is a mechanism for increasing the display resolution or peak luminance of a display within an image display device.

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

[0005] Meanwhile, the circuit elements within the power supply unit that supplies power to the display have a problem in that they are more likely to be damaged by momentary increases in excessive voltage.

[0006] The problem of the present disclosure is to provide an image display device capable of reducing the possibility of damage to circuit elements.

[0007] Another problem of the present disclosure is to provide a video display device capable of reducing the possibility of damage to circuit elements when an input voltage momentarily increases.

[0008] Another problem of the present disclosure is to provide a video display device capable of reducing the possibility of damage to circuit elements when load increases.

[0009] According to one embodiment of the present disclosure for solving the above problem, a video display device includes a display, a signal processing device for outputting a video signal to the display, and a power supply unit having a converter for supplying a display driving voltage to the display, wherein the converter includes a transformer, a first switching element and a second switching element which are arranged at an input terminal of the transformer and are connected in series with each other, a resonant capacitor and a resonant inductor which are respectively connected between the input terminal of the transformer and the second switching element, and a switching control unit which controls the first switching element and the second switching element, wherein the switching unit control unit controls switching of the first switching element and the second switching element to be stopped when a current flowing in the resonant inductor decreases while a switching frequency of the first switching element and the second switching element decreases.

[0010] Meanwhile, the converter further includes a voltage detection unit that detects the voltage of the resonant capacitor and a current detection unit that detects the current flowing in the resonant inductor, and the switching unit control unit calculates a switching frequency based on the detected voltage from the voltage detection unit, and when the current detected by the current detection unit decreases while the calculated switching frequency decreases, the switching of the first switching element and the second switching element can be controlled to stop.

[0011] Meanwhile, the switching unit control unit can control switching of the first switching element and the second switching element to stop when the switching frequency of the first switching element and the second switching element decreases from the first frequency to the second frequency and the level of current flowing in the resonant inductor decreases from the first level to the second level.

[0012] Meanwhile, the switching unit control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the output voltage of the converter increases.

[0013] Meanwhile, the converter further includes an output voltage detection unit that detects an output voltage of the converter, and the switching unit control unit can control switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the detected voltage from the output voltage detection unit increases.

[0014] Meanwhile, the switching unit control unit can control switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the output voltage of the converter increases from the first display driving voltage to the second display driving voltage.

[0015] Meanwhile, the signal processing device can control the power supply to supply the first display driving voltage to the display when the display power control on mode is selected within the setting screen, and can control the power supply to supply the second display driving voltage to the display when the display power control off mode is selected within the setting screen.

[0016] Meanwhile, the switching unit control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases during switching from the display power control on mode to the display power control off mode.

[0017] Meanwhile, the switching unit control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the video output mode is switched from the eco mode or the standard mode to the movie mode or the game mode.

[0018] Meanwhile, the switching unit control unit can control switching of the first switching element and the second switching element to be stopped when the switching frequency is outside the first allowable range and the current flowing in the resonant inductor is outside the second allowable range.

[0019] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the switching frequency of the first switching element and the second switching element decreases as the input voltage input to the converter increases.

[0020] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the load of the output terminal of the converter increases.

[0021] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while a black image is displayed on the display and then a white image is displayed.

[0022] According to another embodiment of the present disclosure, a video display device includes a display, a signal processing device for outputting a video signal to the display, and a power supply unit having a converter for supplying a display driving voltage to the display, wherein the converter includes a transformer, a first switching element and a second switching element which are arranged at an input terminal of the transformer and are connected in series with each other, a resonant capacitor and a resonant inductor which are respectively connected between the input terminal of the transformer and the second switching element, and a switching control unit which controls the first switching element and the second switching element, wherein the switching unit control unit controls switching of the first switching element and the second switching element to be stopped when a current flowing in the resonant inductor decreases while an output voltage of the converter is increasing.

[0023] Meanwhile, the converter further includes an output voltage detection unit that detects an output voltage of the converter, and the switching unit control unit can control switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the detected voltage from the output voltage detection unit increases.

[0024] According to one embodiment of the present disclosure, a video display device includes a display, a signal processing device for outputting a video signal to the display, and a power supply unit having a converter for supplying a display driving voltage to the display, wherein the converter includes a transformer, a first switching element and a second switching element which are arranged at an input terminal of the transformer and are connected in series with each other, a resonant capacitor and a resonant inductor which are respectively connected between the input terminal of the transformer and the second switching element, and a switching control unit which controls the first switching element and the second switching element, wherein the switching unit control unit controls switching of the first switching element and the second switching element to stop when a current flowing in the resonant inductor decreases while a switching frequency of the first switching element and the second switching element decreases. Accordingly, the possibility of damage to circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0025] Meanwhile, the converter further includes a voltage detection unit for detecting a voltage of a resonant capacitor and a current detection unit for detecting a current flowing in a resonant inductor, and the switching unit control unit calculates a switching frequency based on the detected voltage from the voltage detection unit, and when the current detected by the current detection unit decreases while the calculated switching frequency decreases, the switching of the first switching element and the second switching element can be controlled to stop. Accordingly, the possibility of damage to circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0026] Meanwhile, the switching unit control unit can control the switching of the first switching element and the second switching element to stop when the switching frequency of the first switching element and the second switching element decreases from the first frequency to the second frequency and the level of current flowing in the resonant inductor decreases from the first level to the second level. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0027] Meanwhile, the switching control unit can control the switching of the first and second switching elements to be stopped when the current flowing through the resonant inductor decreases while the output voltage of the converter increases. Accordingly, the possibility of damage to circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0028] Meanwhile, the converter further includes an output voltage detection unit that detects the output voltage of the converter, and the switching unit control unit can control the switching of the first switching element and the second switching element to be stopped when the current flowing in the resonant inductor decreases while the detected voltage from the output voltage detection unit increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0029] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to be stopped when the current flowing through the resonant inductor decreases while the output voltage of the converter increases from the first display driving voltage to the second display driving voltage. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0030] Meanwhile, the signal processing device can control the power supply to supply the first display driving voltage to the display when the display power control on mode is selected within the setting screen, and can control the power supply to supply the second display driving voltage to the display when the display power control off mode is selected within the setting screen. Accordingly, various display driving voltages can be output.

[0031] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases during the transition from the display power control on mode to the display power control off mode. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0032] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing through the resonant inductor decreases while the video output mode is switching from eco mode or standard mode to movie mode or game mode. Accordingly, the possibility of damage to circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0033] Meanwhile, the switching unit control unit can control the switching of the first switching element and the second switching element to be stopped when the switching frequency is outside the first allowable range and the current flowing through the resonant inductor is outside the second allowable range. Accordingly, the possibility of damage to circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0034] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the switching frequency of the first switching element and the second switching element decreases as the input voltage input to the converter increases. Accordingly, the possibility of damage to the circuit element can be reduced. In particular, the possibility of damage to the circuit element can be reduced when the input voltage momentarily increases.

[0035] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to be stopped when the current flowing through the resonant inductor decreases while the load at the output stage of the converter increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the circuit elements can be reduced when the load increases.

[0036] Meanwhile, the switching control unit can control the switching of the first switching element and the second switching element to stop when the current flowing through the resonant inductor decreases while the display is displaying a black image and then a white image. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0037] According to another embodiment of the present disclosure, a video display device includes a display, a signal processing device for outputting a video signal to the display, and a power supply unit having a converter for supplying a display driving voltage to the display, wherein the converter includes a transformer, a first switching element and a second switching element which are arranged at an input terminal of the transformer and are connected in series with each other, a resonant capacitor and a resonant inductor which are respectively connected between the input terminal of the transformer and the second switching element, and a switching control unit which controls the first switching element and the second switching element, wherein the switching unit control unit controls switching of the first switching element and the second switching element to stop when a current flowing in the resonant inductor decreases while an output voltage of the converter increases. Accordingly, the possibility of damage to circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0038] Meanwhile, the converter further includes an output voltage detection unit that detects the output voltage of the converter, and the switching unit control unit can control the switching of the first switching element and the second switching element to be stopped when the current flowing in the resonant inductor decreases while the detected voltage from the output voltage detection unit increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0039] FIG. 1 is a drawing illustrating an image display device according to one embodiment of the present disclosure.

[0040] Figure 2 is an example of an internal block diagram of the video display device of Figure 1.

[0041] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0042] Fig. 4a is a drawing illustrating a control method of the remote control device of Fig. 2.

[0043] Figure 4b is an internal block diagram of the remote control device of Figure 2.

[0044] Figure 5 is an example of an internal block diagram of the display of Figure 2.

[0045] FIGS. 6A and 6B are drawings for reference in the description of the organic light-emitting panel of FIG. 5.

[0046] FIG. 7 is an example of an internal block diagram of a video display device according to an embodiment of the present disclosure.

[0047] Fig. 8 is an example of a circuit diagram of a power supply unit according to an embodiment of the present disclosure.

[0048] Figures 9a to 9d are drawings referred to in the description of Figure 8.

[0049] Fig. 10 is a flowchart showing an operation method of a video display device according to an embodiment of the present disclosure.

[0050] Figures 11a to 11c are drawings referred to in the description of Figure 10.

[0051] FIG. 12 is a flowchart showing an operation method of an image display device according to another embodiment of the present disclosure.

[0052] Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

[0053] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0054] FIG. 1 is a drawing illustrating an image display device according to one embodiment of the present disclosure.

[0055] Referring to the drawing, the image display device (100) may include a display (180).

[0056] Meanwhile, the display (180) may be implemented as any one of various panels. For example, the display (180) may 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.

[0057] Liquid crystal display panels may require a separate backlight in addition to the panel for displaying images.

[0058] Meanwhile, organic light-emitting panels or inorganic light-emitting panels do not require a separate backlight for image display.

[0059] Meanwhile, the display resolution of the display (180) is increasing to 2K, 4K, 8K, 16K, etc., and the peak luminance that can be displayed on the display (180) is also increasing. Accordingly, the power consumption of the power supplied to the display (180) is increasing.

[0060] Meanwhile, the circuit elements in the power supply unit (190 in Fig. 2) for supplying power to the display (18) have a problem in that they are more likely to be damaged due to a momentary increase in excessive voltage, etc.

[0061] Accordingly, the present disclosure proposes a method for reducing the possibility of damage to circuit elements.

[0062] The image display device (100) according to the embodiment of the present disclosure provides a method for reducing heat generation in a circuit board within the image display device (100) or reducing the possibility of damage to circuit elements by appropriately supplying a display driving voltage even when the displayable modes on the display (180) are diverse.

[0063] To this end, an image display device according to one embodiment of the present disclosure includes a display (180), a signal processing device (170 in FIG. 2) that outputs an image signal to the display (180), and a power supply unit (190 in FIG. 2) that supplies a display driving voltage to the display (180).

[0064] Meanwhile, a power supply unit (190) according to one embodiment of the present disclosure includes an internal switching element and a transformer (05 in FIG. 8), a first switching element (SW1 in FIG. 8) and a second switching element (SW2 in FIG. 8) that are arranged at an input terminal of the transformer (805) and are connected in series with each other, a resonant capacitor (Cr in FIG. 8) and a resonant inductor (Lr in FIG. 8) that are respectively connected between the input terminal of the transformer (805) and the second switching element (SW2), and a switching control unit (925 in FIG. 8) that controls the first switching element (SW1) and the second switching element (SW2).

[0065] Meanwhile, the switching unit control unit (925) according to one embodiment of the present disclosure controls the switching of the first switching element (SW1) and the second switching element (SW2) to stop when the current (ir in FIG. 8) flowing in the resonant inductor (Lr) decreases while the switching frequency of the first switching element (SW1) and the second switching element (SW2) decreases.

[0066] Accordingly, the possibility of damage to circuit components can be reduced. In particular, the possibility of damage to resonant capacitors can be reduced.

[0067] Meanwhile, the switching control unit (925) according to another embodiment of the present disclosure can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases while the output voltage (Vd) of the converter (910) increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor can be reduced.

[0068] Meanwhile, the switching unit control unit (925) according to another embodiment of the present disclosure can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases while the switching frequency of the first switching element (SW1) and the second switching element (SW2) decreases as the input voltage input to the converter (910) increases. Accordingly, the possibility of damage to the circuit element can be reduced. In particular, the possibility of damage to the circuit element can be reduced when the input voltage rises momentarily.

[0069] Meanwhile, the switching unit control unit (925) according to another embodiment of the present disclosure can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases while the load of the output terminal of the converter (910) increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the circuit elements can be reduced when the load increases.

[0070] Meanwhile, the video display device (100) of Fig. 1 can be a TV, monitor, tablet PC, mobile terminal, etc.

[0071] Figure 2 is an example of an internal block diagram of the video display device of Figure 1.

[0072] Referring to FIG. 2, an image display device (100) according to an embodiment of the present disclosure may 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), a display (180), and an audio output unit (185).

[0073] The video receiving unit (105) may include a tuner unit (110), a demodulation unit (120), a network interface unit (130), and an external device interface unit (130).

[0074] Meanwhile, unlike the drawing, the video receiving unit (105) may include only a tuner unit (110), a demodulator unit (120), and an external device interface unit (130). That is, it may not include a network interface unit (130).

[0075] The tuner unit (110) selects an RF broadcast signal corresponding to a channel selected by the user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through an antenna (not shown). In addition, it converts the selected RF broadcast signal into an intermediate frequency signal or a baseband video or audio signal.

[0076] 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 the signal processing device (170).

[0077] Meanwhile, the tuner unit (110) may be equipped with multiple tuners to receive broadcast signals of multiple channels. Alternatively, a single tuner that simultaneously receives broadcast signals of multiple channels is also possible.

[0078] The demodulation unit (120) receives the digital IF signal (DIF) converted from the tuner unit (110) and performs a demodulation operation.

[0079] The demodulator (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.

[0080] The stream signal output from the demodulator (120) can be input to the signal processing device (170). The signal processing device (170) performs demultiplexing, image / audio signal processing, etc., and then outputs an image to the display (180) and outputs an audio to the audio output device (185).

[0081] The external device interface unit (130) can transmit or receive data to or from 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).

[0082] The external device interface unit (130) can be connected to external devices such as a DVD (Digital Versatile Disk), Blu-ray, game device, camera, camcorder, computer (laptop), set-top box, etc., via wired / wireless connection, and can also perform input / output operations with the external devices.

[0083] 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.

[0084] Through this 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, running application information, application images, etc. from the mobile terminal (600) in mirroring mode.

[0085] The network interface unit (135) provides an interface for connecting the video display device (100) to a wired / wireless network, including the Internet. For example, the network interface unit (135) can receive content or data provided by the Internet, a content provider, or a network operator via a network.

[0086] Meanwhile, the network interface unit (135) may include a wireless communication unit (not shown).

[0087] The storage unit (140) may store programs for each signal processing and control within the signal processing device (170), and may also store signal-processed image, voice, or data signals.

[0088] In addition, the storage unit (140) may also perform a function for temporary storage of video, audio, or data signals input to the external device interface unit (130). In addition, the storage unit (140) may store information regarding a specific broadcast channel through a channel memory function such as a channel map.

[0089] Although the storage unit (140) of 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).

[0090] 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.

[0091] For example, a user input signal such as power on / off, channel selection, screen setting, etc. may be transmitted / received from a remote control device (200), a user input signal input from a local key (not shown) such as a power key, a channel key, a volume key, a setting value, etc. may be transmitted to a signal processing device (170), a user input signal input from a sensor unit (not shown) that senses a user's gesture may be transmitted to the signal processing device (170), or a signal from the signal processing device (170) may be transmitted to a sensor unit (not shown).

[0092] The signal processing device (170) can demultiplex an input stream or process demultiplexed signals through a tuner unit (110), a demodulator unit (120), a network interface unit (135), or an external device interface unit (130) to generate and output a signal for video or audio output.

[0093] For example, the signal processing device (170) can receive a broadcast signal or an HDMI signal received from the image receiving unit (105), perform signal processing based on the received broadcast signal or HDMI signal, and output a signal-processed image signal.

[0094] An image signal processed by a signal processing device (170) may be input to a display (180) and displayed as an image corresponding to the image signal. In addition, an image signal processed by a signal processing device (170) may be input to an external output device through an external device interface unit (130).

[0095] The voice signal processed in the signal processing device (170) can be output as sound to the audio output unit (185). In addition, the voice signal processed in the signal processing device (170) can be input to an external output device through the external device interface unit (130).

[0096] Although not illustrated in FIG. 2, the signal processing device (170) may include a demultiplexing unit, an image processing unit, etc. That is, the signal processing device (170) may perform various signal processing operations and, accordingly, may be implemented in the form of a system on chip (SOC). This will be described later with reference to FIG. 3.

[0097] In addition, the signal processing device (170) can control the overall operation within the video display device (100). For example, the signal processing device (170) can control the tuner unit (110) to select (tune) an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

[0098] 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).

[0099] 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 moving image, and may be a 2D image or a 3D image.

[0100] Meanwhile, the signal processing device (170) can cause a predetermined object to be displayed within an image displayed on the display (180). For example, the object can be at least one of a connected web screen (newspaper, magazine, etc.), an EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

[0101] Meanwhile, the signal processing device (170) can recognize the user's location based on an image captured from a camera (not shown). For example, the distance (z-axis coordinate) between the user and the image display device (100) can be determined. In addition, the x-axis coordinate and y-axis coordinate within the display (180) corresponding to the user's location can be determined.

[0102] The display (180) generates a driving signal by converting a video signal, data signal, OSD signal, control signal, etc. processed by the signal processing device (170) or a video signal, data signal, control signal, etc. received from the external device interface unit (130).

[0103] Meanwhile, the display (180) is configured as a touch screen and can be used as an input device in addition to an output device.

[0104] The audio output unit (185) receives a signal processed by the signal processing device (170) and outputs it as voice.

[0105] A camera unit (not shown) photographs a user. The camera unit (not shown) may be implemented with a single camera, but is not limited thereto, and may also be implemented with multiple cameras. Image information captured by the camera unit (not shown) may be input to a signal processing device (170).

[0106] The signal processing device (170) can detect the user's gesture based on an image captured from a shooting unit (not shown) or a signal detected from a sensor unit (not shown), or a combination thereof.

[0107] The power supply unit (190) supplies power to the entire 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.

[0108] Specifically, the power supply unit (190) may be equipped with a converter that converts AC voltage into DC voltage and a dc / dc converter that converts the level of the DC voltage.

[0109] 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, IR (Infrared) communication, UWB (Ultra Wideband), ZigBee, etc. In addition, the remote control device (200) may receive video, audio, or data signals output from the user input interface unit (150) and display or output the same as audio on the remote control device (200).

[0110] Meanwhile, the above-described video display device (100) may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasts.

[0111] Meanwhile, the block diagram of the image display device (100) illustrated in FIG. 2 is a block diagram for one embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the image display device (100) actually implemented. That is, two or more components may be combined into one component, or one component may be subdivided into two or more components, as needed. In addition, the functions performed by each block are intended to explain the embodiment of the present disclosure, and the specific operations or devices thereof do not limit the scope of the present disclosure.

[0112] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0113] Referring to the drawings, a signal processing device (170) according to an embodiment of the present disclosure may include a demultiplexing unit (310), an image processing unit (320), a processor (330), and an audio processing unit (370). In addition, a data processing unit (not shown) may be further included.

[0114] The demultiplexer (310) demultiplexes the input stream. For example, when MPEG-2 TS is input, it can be demultiplexed to separate it into video, audio, and data signals, respectively. Here, the stream signal input to the demultiplexer (310) may be a stream signal output from the tuner (110), the demodulator (120), or the external device interface (130).

[0115] The image processing unit (320) can perform signal processing on an input image. For example, the image processing unit (320) can perform image processing on an image signal demultiplexed from the demultiplexing unit (310).

[0116] 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), an OSD processing unit (340), a frame rate conversion unit (350), and a formatter (360).

[0117] The video decoder (325) decodes the demultiplexed video signal, and the scaler (335) scales the resolution of the decoded video signal so that it can be output on the display (180).

[0118] The video decoder (325) can be equipped with decoders of various standards. For example, it can be equipped with an MPEG-2, H.264 decoder, a 3D video decoder for color images and depth images, a decoder for multi-view images, etc.

[0119] The scaler (335) can scale an input video signal that has been decoded by a video decoder (325), etc.

[0120] For example, the scaler (335) can upscale when the size or resolution of the input image signal is small, and downscale when the size or resolution of the input image signal is large.

[0121] The image quality processing unit (635) can perform image quality processing on an input image signal for which image decoding has been completed in the image decoder (325), etc.

[0122] For example, the image quality processing unit (635) may perform noise removal processing of an input image signal, expand the resolution of the gradation of an input image signal, perform image resolution enhancement, perform signal processing based on high dynamic range (HDR), vary the frame rate, or perform image quality processing corresponding to panel characteristics, particularly organic light-emitting panels.

[0123] The OSD processing unit (340) generates an OSD signal based on user input or on its own. For example, based on a user input signal, a signal for displaying various information in the form of graphics or text on the screen of the display (180) may be generated. The generated OSD signal may include various data such as the user interface screen of the image display device (100), various menu screens, widgets, and icons. In addition, the generated OSD signal may include a 2D object or a 3D object.

[0124] In addition, the OSD processing unit (340) can generate a pointer that can be displayed on the display based on a pointing signal input from the remote control device (200). In particular, such a pointer can be generated by the pointing signal processing unit, and the OSD processing unit (240) can include such a pointing signal processing unit (not shown). Of course, the pointing signal processing unit (not shown) can also be provided separately rather than being included within the OSD processing unit (240).

[0125] The frame rate converter (FRC) (350) can convert the frame rate of an input video. Meanwhile, the frame rate converter (350) can also output the video as is without a separate frame rate conversion.

[0126] Meanwhile, the formatter (360) can change the format of an input video signal into a video signal for display on a display and output it.

[0127] In particular, the formatter (360) can change the format of the video signal to correspond to the display panel.

[0128] Meanwhile, the formatter (360) can also change the format of the video signal. For example, the format of the 3D video signal can be changed to any one of various 3D formats, such as a side-by-side format, a top-down format, a frame sequential format, an interlaced format, and a checker box format.

[0129] The processor (330) can control the overall operation within the image display device (100) or the signal processing device (170).

[0130] For example, the processor (330) can control the tuner (110) to select (tune) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0131] In addition, the processor (330) can control the image display device (100) by a user command or internal program input through the user input interface unit (150).

[0132] Additionally, the processor (330) can perform data transmission control with the network interface unit (135) or the external device interface unit (130).

[0133] Additionally, the processor (330) can control the operation of the demultiplexing unit (310), the image processing unit (320), etc., within the signal processing device (170).

[0134] Meanwhile, the audio processing unit (370) within the signal processing device (170) can perform audio processing of the demultiplexed audio signal. To this end, the audio processing unit (370) can be equipped with various decoders.

[0135] Additionally, the audio processing unit (370) within the signal processing device (170) can process bass, treble, volume control, etc.

[0136] A data processing unit (not shown) within a signal processing device (170) can perform data processing on a demultiplexed data signal. For example, if the demultiplexed data signal is an encoded data signal, it can be decoded. The encoded data signal may be electronic program guide information (EPG) information that includes broadcast information such as the start time and end time of a broadcast program broadcast on each channel.

[0137] Meanwhile, the block diagram of the signal processing device (170) illustrated in FIG. 3 is a block diagram for one embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the signal processing device (170) actually implemented.

[0138] In particular, the frame rate conversion unit (350) and formatter (360) may be provided separately from the image processing unit (320).

[0139] Fig. 4a is a drawing illustrating a control method of the remote control device of Fig. 2.

[0140] As shown in (a) of FIG. 4a, a pointer (205) corresponding to a remote control device (200) is displayed on the display (180).

[0141] 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 video display device corresponds to the movement of the remote control device (200). As shown in the drawing, the pointer (205) moves and is displayed according to the movement in 3D space, so the remote control device (200) can be called a space remote control or a 3D pointing device.

[0142] Figure 4a (b) illustrates that when a user moves the remote control device (200) to the left, the pointer (205) displayed on the display (180) of the video display device also moves to the left in response.

[0143] Information about the movement of the remote control device (200) detected by 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 about the movement of the remote control device (200). The image display device can display the pointer (205) to correspond to the calculated coordinates.

[0144] FIG. 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). As a result, the selection area within the display (180) corresponding to the pointer (205) may be zoomed in and displayed in an enlarged manner. Conversely, when the user moves the remote control device (200) closer to the display (180), the selection area within the display (180) corresponding to the pointer (205) may be zoomed out and displayed in a reduced manner. Meanwhile, when the remote control device (200) moves away from the display (180), the selection area may be zoomed out, and when the remote control device (200) moves closer to the display (180), the selection area may be zoomed in.

[0145] Meanwhile, when a specific button within the remote control device (200) is pressed, recognition of up, down, left, and right movements may be excluded. That is, when the remote control device (200) moves away from or toward the display (180), up, down, left, and right movements may not be recognized, and only forward and backward movements may be recognized. When a specific button within the remote control device (200) is not pressed, only the pointer (205) moves in accordance with the up, down, left, and right movements of the remote control device (200).

[0146] Meanwhile, the movement speed or movement direction of the pointer (205) can correspond to the movement speed or movement direction of the remote control device (200).

[0147] Figure 4b is an internal block diagram of the remote control device of Figure 2.

[0148] 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).

[0149] 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.

[0150] In this embodiment, the remote control device (200) may be equipped with an RF module (421) capable of transmitting and receiving signals with the image display device (100) in accordance with RF communication standards. In addition, the remote control device (200) may be equipped with an IR module (423) capable of transmitting and receiving signals with the image display device (100) in accordance with IR communication standards.

[0151] In this embodiment, the remote control device (200) transmits a signal containing information about the movement of the remote control device (200) to the image display device (100) through the RF module (421).

[0152] In addition, the remote control device (200) can receive a signal transmitted by the image display device (100) through the RF module (421). In addition, the remote control device (200) can transmit commands for power on / off, channel change, volume change, etc. to the image display device (100) through the IR module (423) as needed.

[0153] The user input unit (435) may be configured as a keypad, a button, a touch pad, or a touch screen. The user can input a command 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) has a hard key button, the user can input a command related to the image display device (100) to the remote control device (200) by pushing the hard key button. If the user input unit (435) has a touch screen, the user can input a command related to the image display device (100) to the remote control device (200) by touching a soft key of the touch screen. In addition, 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 the present embodiment does not limit the scope of the present disclosure.

[0154] The sensor unit (440) may be equipped with a gyro sensor (441) or an acceleration sensor (443). The gyro sensor (441) may sense information regarding the movement of the remote control device (200).

[0155] For example, a gyro sensor (441) can sense information about the operation of a remote control device (200) based on the x, y, and z axes. An acceleration sensor (443) can sense information about the movement speed of the remote control device (200). Meanwhile, a distance measuring sensor can be further provided, thereby sensing the distance to the display (180).

[0156] The output unit (450) can output a video or audio signal corresponding to the operation of the user input unit (435) or to 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 being operated or whether the video display device (100) is being controlled.

[0157] 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 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, an audio output module (455) that outputs audio, or a display module (457) that outputs audio.

[0158] 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) is not moved for a predetermined period of time. The power supply unit (460) can resume the power supply when a predetermined key provided on the remote control device (200) is operated.

[0159] The storage unit (470) can store various types of programs, application data, etc. required for the control or operation of the remote control device (200). If the remote control device (200) wirelessly transmits and receives signals through the image display device (100) and the RF module (421), the remote control device (200) and the image display device (100) transmit and receive signals through a predetermined frequency band. The control unit (480) of the remote control device (200) can store and refer to information regarding the frequency band through which signals can be wirelessly transmitted and received between the remote control device (200) and the paired image display device (100), etc., in the storage unit (470).

[0160] 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) via the wireless communication unit (425).

[0161] The user input interface unit (150) of the video 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 the coordinate value of a pointer corresponding to the operation of the remote control device (200).

[0162] The user input interface unit (150) can wirelessly transmit and receive signals to and from the remote control device (200) via the RF module (412). In addition, the user input interface unit (150) can receive signals transmitted by the remote control device (200) according to the IR communication standard via the IR module (413).

[0163] 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 hand shake or error from a signal corresponding to the operation of the remote control device (200) received through the wireless communication unit (151).

[0164] A transmission signal of a remote control device (200) input to a video display device (100) through a user input interface unit (150) is transmitted to a signal processing device (170) of the video display device (100). The signal processing device (170) can determine information about the operation and key operation of the remote control device (200) from the signal transmitted from the remote control device (200) and control the video display device (100) in response thereto.

[0165] As another example, the remote control device (200) can calculate pointer coordinate values ​​corresponding to the operation and output them to the user input interface unit (150) of the image display device (100). In this case, the user input interface unit (150) of the image display device (100) can transmit information about the received pointer coordinate values ​​to the signal processing device (170) without a separate hand shake or error correction process.

[0166] In addition, as another example, the coordinate value calculation unit (415) may be provided inside the signal processing device (170) rather than the user input interface unit (150), unlike in the drawing.

[0167] Figure 5 is an example of an internal block diagram of the display of Figure 2.

[0168] Referring to the drawing, the display (180b) based on an organic light-emitting panel may include an organic light-emitting panel (210b), a first interface unit (230b), a second interface unit (231b), a timing controller (232b), a gate driver unit (234b), a data driver unit (236b), a memory (240b), a processor (270b), a power supply unit (290b), a current detector unit (510b), etc.

[0169] The display (180b) receives a video signal (Vdb), a first DC voltage (V1b), and a second DC voltage (V2b), and can display a predetermined image based on the video signal (Vdb).

[0170] Meanwhile, the first interface unit (230b) within the display (180b) can receive a video signal (Vdb) and a first DC voltage (V1b) from the signal processing device (170b).

[0171] Here, the first DC voltage (V1b) can be used for the operation of the power supply (290b) and the timing controller (232b) within the display (180b).

[0172] Next, the second interface unit (231b) can receive a second DC voltage (V2b) from an external power supply unit (190b). Meanwhile, the second DC voltage (V2b) can be input to a data driving unit (236b) within the display (180b).

[0173] The timing controller (232b) can output a data driving signal (Sdab) and a gate driving signal (Sgab) based on a video signal (Vdb).

[0174] For example, when the first interface unit (230b) converts an input image signal (Vdb) and outputs a converted image signal (va1b), the timing controller (232b) can output a data driving signal (Sdab) and a gate driving signal (Sgab) based on the converted image signal (va1b).

[0175] The timing controller (timing controllerb) (232b) can receive, in addition to the video signal (Vdb) from the signal processing device (170b), a control signal, a vertical synchronization signal (Vsyncb), etc.

[0176] In addition, the timing controller (timing controllerb) (232b) can output a gate driving signal (Sgab) for the operation of the gate driving unit (234b) and a data driving signal (Sdab) for the operation of the data driving unit (236b) based on a control signal, a vertical synchronization signal (Vsyncb), etc., in addition to a video signal (Vdb).

[0177] The data driving signal (Sdab) at this time may be a data driving signal for driving RGBW subpixels when the panel (210b) has RGBW subpixels.

[0178] Meanwhile, the timing controller (232b) can further output a control signal (Csb) to the gate driver (234b).

[0179] The gate driving unit (234b) and the data driving unit (236b) supply a scan signal and an image signal to the organic light-emitting panel (210b) through the gate line (GLb) and the data line (DLb), respectively, in accordance with the gate driving signal (Sgab) and the data driving signal (Sdab) from the timing controller (232b). Accordingly, the organic light-emitting panel (210b) displays a predetermined image.

[0180] Meanwhile, the organic light-emitting panel (210b) may include an organic light-emitting layer, and in order to display an image, a plurality of gate lines (GLb) and data lines (DLb) may be arranged in a matrix form to cross each pixel corresponding to the organic light-emitting layer.

[0181] Meanwhile, the data driving unit (236b) can output a data signal to the organic light-emitting panel (210b) based on the second DC voltage (V2b) from the second interface unit (231b).

[0182] The power supply unit (290b) can supply various power sources to the gate driver unit (234b), the data driver unit (236b), the timing controller (232b), etc.

[0183] The current detection unit (510b) can detect the current flowing in the subpixel of the organic light-emitting panel (210b). The detected current can be input to a processor (270b) or the like for cumulative current calculation.

[0184] The processor (270b) can perform various controls within the display (180b). For example, it can control the gate driver (234b), the data driver (236b), the timing controller (232b), etc.

[0185] Meanwhile, the processor (270b) can receive information on current flowing in the subpixel of the organic light-emitting panel (210b) from the current detection unit (510b).

[0186] FIGS. 6A and 6B are drawings for reference in the description of the organic light-emitting panel of FIG. 5.

[0187] First, FIG. 6a is a drawing showing pixels within an organic light-emitting panel (210b).

[0188] 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) intersecting therewith.

[0189] 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 illustrated.

[0190] FIG. 6b illustrates the circuit of one sub-pixel within the pixel of the organic light-emitting panel of FIG. 6a.

[0191] Referring to the drawing, the organic light-emitting sub-pixel circuit (CRTm) may be an active type and include a scan switching element (SW1), a storage capacitor (Cst), a driving switching element (SW2), and an organic light-emitting layer (OLED).

[0192] The scan switching element (SW1) is turned on according to an input scan signal (Vdscan) by connecting a scan line to the gate terminal. When turned on, the input data signal (Vdata) is transmitted to the gate terminal of the driving switching element (SW2) or one end of the storage capacitor (Cst).

[0193] The storage capacitor (Cst) is formed between the gate terminal and the source terminal of the driving switching element (SW2), and stores a predetermined difference between the data signal level transmitted to one end of the storage capacitor (Cst) and the DC voltage (Vdd) level transmitted to the other end of the storage capacitor (Cst).

[0194] For example, if the data signal has different levels according to the PAM (Plus Amplitude Modulation) method, the power level stored in the storage capacitor (Cst) changes depending on the level difference of the data signal (Vdata).

[0195] As another example, when the data signal has different pulse widths according to the Pulse Width Modulation (PWM) method, the power level stored in the storage capacitor (Cst) changes depending on the difference in the pulse width of the data signal (Vdata).

[0196] The driving switching element (SW2) is turned on according to the power level stored in the storage capacitor (Cst). When the driving switching element (SW2) is turned on, a driving current (IOLED) proportional to the stored power level flows to the organic light-emitting layer (OLED). Accordingly, the organic light-emitting layer (OLED) performs a light-emitting operation.

[0197] The organic light-emitting layer (OLED) includes an RGBW emission layer (EML) corresponding to a subpixel, and may include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL), and may also include a hole blocking layer.

[0198] Meanwhile, subpixels all emit white light from the organic light-emitting diode (OLED), but separate color filters are provided for green, red, and blue subpixels to implement the colors. That is, green, red, and blue subpixels each additionally have green, red, and blue color filters. On the other hand, white subpixels emit white light, so separate color filters are not required.

[0199] Meanwhile, in the drawing, a case in which a p-type MOSFET is used as the scan switching element (SW1) and the driving switching element (SW2) is exemplified, but an n-type MOSFET, or other switching elements such as a JFET, IGBT, or SIC may also be used.

[0200] Meanwhile, a pixel is a hold-type element that continues to emit light in an organic light-emitting layer (OLED) after a scan signal is applied during a unit display period, specifically, during a unit frame.

[0201] FIG. 7 is an example of an internal block diagram of a video display device according to an embodiment of the present disclosure.

[0202] Referring to the drawings, an image display device (100) according to an embodiment of the present disclosure includes a display (180), a signal processing device (170) that outputs an image signal to the display (180), and a power supply unit (190) that supplies a display driving voltage to the display (180).

[0203] A power supply unit (190) according to one embodiment of the present disclosure includes an ac / dc converter (905) that converts an input alternating current voltage (Va) into a direct current voltage, and a dc / dc converter (910) that converts the level of the direct current voltage from the ac / dc converter (905) to output a display drive voltage (Vdd).

[0204] In the drawing, it is illustrated that an ac / dc converter (905) is placed between node n2, which is an input terminal of a power supply unit (190), and n3, which is an input node of a dc / dc converter (910).

[0205] Meanwhile, n1, the output node of the ac / dc converter (905), can be electrically connected to the display (180).

[0206] The AC / DC converter (905) can convert an input AC voltage (Va) into a first level DC voltage and output it by having a diode or switching element.

[0207] The dc / dc converter (910) can convert a first level DC voltage input and output a second level display driving voltage (Vdd).

[0208] For example, the converter (910) can step up a first level DC voltage to output a second level display driving voltage (Vdd) higher than the first level.

[0209] Meanwhile, if the display (180) is an organic light-emitting panel, the display driving voltage (Vdd) may be a pixel driving voltage of an organic light-emitting pixel.

[0210] 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.

[0211] 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.

[0212] Meanwhile, the image display device (100) according to one embodiment of the present disclosure further includes a main board (900) including a signal processing device (170) and a microcomputer (173).

[0213] The signal processing device (170) can output a video signal to a display (180).

[0214] When a remote control signal is received, the microcomputer (173) operates and can control the operation of the signal processing device (170) or the power supply unit (190).

[0215] A power supply unit (190) according to one embodiment of the present disclosure can output a microcomputer driving voltage (Vst) for the operation of a microcomputer (173).

[0216] To this end, the power supply unit (190) according to one embodiment of the present disclosure may further include a second dc / dc converter (915) that converts a first level direct current voltage input and outputs a third level microcomputer driving voltage (Vst).

[0217] At this time, the microcomputer driving voltage (Vst) may be lower than the display driving voltage (Vdd).

[0218] Meanwhile, the main board (900) or signal processing device (170) can output a display on signal (Spo) or a display (180) off signal (Spf) to the power supply unit (190).

[0219] Accordingly, when the display (180) is on, the dc / dc converter (910) operates, and when the display (180) is off, the operation of the dc / dc converter (910) may be stopped.

[0220] Meanwhile, the main board (900) or signal processing device (170) can output a switch drive control signal (SSwa) to the ac / dc converter (905). Accordingly, the ac / dc converter (905) can be driven stably.

[0221] Meanwhile, the main board (900) or signal processing device (170) can output a switch driving control signal (SSwb) to the dc / dc converter (910). Accordingly, the dc / dc converter (910) can be driven stably.

[0222] Meanwhile, the main board (900) or signal processing device (170) can output a switch drive control signal (SSwc) to the second dc / dc converter (915). Accordingly, the second dc / dc converter (915) can be stably driven.

[0223] Meanwhile, the power supply unit (190) may further include a signal transmission unit (FDK) connected between the converter (910) and the main board (900).

[0224] The signal transmission unit (FDK) can receive a display on signal (Spo) or a display off signal (Spf) from a main board (900) including a signal processing device (170) or a signal processing device (170), and transmit the display on signal (Spo) or the display off signal (Spf) to the converter (910).

[0225] Fig. 8 is an example of a circuit diagram of a power supply unit according to an embodiment of the present disclosure.

[0226] Referring to the drawing, the power supply unit (190) according to the embodiment of the present disclosure includes a converter (910) that converts an input voltage and outputs a direct current voltage. The converter (910) at this time may be a dc / dc converter as illustrated in FIG. 7.

[0227] A converter (910) according to an embodiment of the present disclosure includes a transformer (805), a first switching element (SW1) and a second switching element (SW2) which are arranged at an input terminal of the transformer (805) and are connected in series with each other, a resonant capacitor (Cr) and a resonant inductor (Lr) which are respectively connected between the input terminal of the transformer (805) and the second switching element (SW2), and a switching control unit (925) which controls the first switching element (SW1) and the second switching element (SW2).

[0228] Meanwhile, the switching control unit (925) controls the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing through the resonant inductor (Lr) decreases while the switching frequency of the first switching element (SW1) and the second switching element (SW2) decreases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0229] Meanwhile, the converter (910) according to the embodiment of the present disclosure may further include a full bridge diode (Da to Dd) connected to the output terminal (noa to nob) of the transformer (805), and a capacitor (Cd) connected to both ends (nda to ndb) of the output terminal of the full bridge diode (Da to Dd).

[0230] Meanwhile, the converter (910) according to the embodiment of the present disclosure may further include a resistance element (Rd) connected in parallel to the capacitor (Cd).

[0231] Meanwhile, the converter (910) according to the embodiment of the present disclosure may further include a voltage detection unit (A) that detects the voltage (Vr) of the resonant capacitor (Cr) and a current detection unit (B) that detects the current (ir) flowing in the resonant inductor (Lr).

[0232] Meanwhile, the switching unit control unit (925) calculates a switching frequency based on the detected voltage (Vr) from the voltage detection unit (A), and when the calculated switching frequency decreases and the current detected by the current detection unit (B) decreases, the switching of the first switching element (SW1) and the second switching element (SW2) can be controlled to stop. Accordingly, the possibility of damage to the circuit elements can be reduced.

[0233] Meanwhile, the switching unit control unit (925) calculates a switching frequency based on the detected voltage (Vr) from the voltage detection unit (A), and when the calculated switching frequency decreases and the current detected by the current detection unit (B) decreases, the switching of the first switching element (SW1) and the second switching element (SW2) can be controlled to stop. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0234] Meanwhile, the converter (910) may further include an output voltage detection unit (E) that detects the output voltage (Vd) of the converter (910).

[0235] Meanwhile, the switching unit control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases while the detection voltage (Vd) from the output voltage detection unit (E) increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0236] Figures 9a to 9d are drawings referred to in the description of Figure 8.

[0237] Figure 9a is a diagram showing an example of changes in switching frequency and resonant current in response to changes in the output voltage of the converter.

[0238] Figure 9a can correspond to a case where the switching frequency and resonant current are in normal operation in response to changes in the output voltage of the converter.

[0239] Referring to the drawing, the output voltage (Vd) of the converter (910) may maintain the first display driving voltage (Vb1), then increase at the Ta1 time point, and rise to the second display driving voltage (Vb2) at the Ta2 time point.

[0240] The output voltage (Vd) of the converter (910) can maintain the second display driving voltage (Vb2) from the Ta2 point to the Ta3 point, and then decrease to the third display driving voltage (Vb3) at the Ta4 point.

[0241] Meanwhile, the switching unit control unit (925) can control the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) to decrease when the output voltage (Vd) of the converter (910) increases.

[0242] Meanwhile, the switching unit control unit (925) can control the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) to increase when the output voltage (Vd) of the converter (910) decreases.

[0243] That is, as shown in the drawing, the switching frequency (fs) maintains the first frequency (fb1), decreases at the Ta1 time point, and can drop to the second frequency (fb2) at the Ta2 time point.

[0244] The switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) may be maintained at the second frequency (fb2) from the time point Ta2 to the time point Ta3, and then may increase to the third switching frequency (fb3) at the time point Ta4.

[0245] Meanwhile, when the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) decreases, the current (ir) flowing in the resonant inductor (Lr) increases.

[0246] Meanwhile, when the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) increases, the current (ir) flowing in the resonant inductor (Lr) decreases.

[0247] That is, as shown in the drawing, the current (ir) flowing in the resonant inductor (Lr) maintains the first current (ib1), increases at time Ta1, and can increase to the second current (ib2) at time Ta2.

[0248] The current (ir) flowing in the resonant inductor (Lr) maintains the second current (ib2) from the time Ta2 to the time Ta3, then decreases at the time Ta3, and can decrease to the third current (ib3) at the time Ta4.

[0249] Figure 9b is a diagram showing another example of changes in switching frequency and resonant current in response to changes in the output voltage of the converter.

[0250] Fig. 9b can respond to a case where the switching frequency and resonant current operate abnormally in response to a change in the output voltage of the converter.

[0251] Referring to the drawing, the output voltage (Vd) of the converter (910) may maintain the first display driving voltage (Vb1), increase at the time point Tb1, and rise to the second display driving voltage (Vb2) at the time point Tb2.

[0252] The output voltage (Vd) of the converter (910) may maintain the second display driving voltage (Vb2) from the time point Tb2 to the time point Tb3, and then decrease at the time point Tb3, and may decrease to the third display driving voltage (Vb3) at the time point Tb4.

[0253] Meanwhile, the switching unit control unit (925) can control the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) to decrease when the output voltage (Vd) of the converter (910) increases, and can control the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) to increase when the output voltage (Vd) of the converter (910) decreases.

[0254] That is, as shown in the drawing, the switching frequency (fs) maintains the first frequency (fb1), decreases at the time point Tb1, and can drop to the second frequency (fb2) at the time point Tb2.

[0255] The switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) may be maintained at the second frequency (fb2) from the time point Tb2 to the time point Tb3, and then may increase to the third switching frequency (fb3) at the time point Tb4.

[0256] Meanwhile, when the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) decreases, the current (ir) flowing in the resonant inductor (Lr) should increase, but may decrease, as shown in the drawing, depending on the abnormal operation.

[0257] Meanwhile, when the switching frequency (fs) of the first switching element (SW1) and the second switching element (SW2) increases, the current (ir) flowing in the resonant inductor (Lr) should decrease, but may increase, as shown in the drawing, depending on abnormal operation.

[0258] Figure 9b (c) illustrates that the current (irbx) flowing in the resonant inductor (Lr) maintains the first current (ib1), then decreases at time Tb1, and then decreases to the fourth current (ib4) at time Tb2.

[0259] Meanwhile, (c) of Fig. 9b illustrates that the current (irbx) flowing in the resonant inductor (Lr) maintains the second current (ib2) from the time point Tb2 to the time point Tb3, then increases at the time point Tb3, and increases to the fifth current (ib5) at the time point Tb4.

[0260] As shown in (c) of Fig. 9b, the case where the current (irbx) flowing in the resonant inductor (Lr) appears abnormally occurs when the input voltage input to the converter (910) increases momentarily.

[0261] Figure 9c illustrates an instantaneous increase in the input voltage input to the converter (910).

[0262] Referring to the drawing, the input voltage input to the converter (910) is a direct current voltage and may pulsate somewhat.

[0263] As shown in the drawing, the input voltage input to the converter (910) can pulsate approximately stably until the Tb1 point, but after the Tb1 point, it can increase momentarily and reach the peak level (Arx).

[0264] In this case, as shown in (c) of Fig. 9b, after the point Tb1, the current (irbx) flowing in the resonant inductor (Lr) appears abnormal.

[0265] Figure 9d shows an example of resonant current (iry).

[0266] Referring to the drawing, up to the point Tba, the normal resonant current (Ara) is present, the peak level of the resonant current is La, and the switching frequency can be fa.

[0267] Meanwhile, after the point Tb2 where the input voltage input to the converter (910) instantaneously increases, an abnormal resonant current (Arb) may occur, the peak level of the resonant current being Lb, which is smaller than La, and the switching frequency being fb, which is smaller than fa.

[0268] Meanwhile, as described in FIGS. 9b to 9d, when the input voltage input to the converter (910) increases and the switching frequency of the first switching element (SW1) and the second switching element (SW2) decreases, if the current (ir) flowing in the resonant inductor (Lr) decreases, the possibility of damage to the resonant capacitor (Cr) placed in front of the transformer (805) increases.

[0269] Accordingly, in this disclosure, a method for reducing the possibility of damage to circuit elements, particularly resonant capacitors (Cr), within a converter (910) is proposed. This is described in more detail with reference to FIG. 10 and below.

[0270] Fig. 10 is a flowchart showing an operation method of a video display device according to an embodiment of the present disclosure.

[0271] Referring to the drawing, a power supply unit (190) according to one embodiment of the present disclosure operates a converter (910) (S1010).

[0272] For example, the switching unit control unit (925) can control the switching frequency of the first switching element (SW1) and the second switching element (SW2) to operate at the first frequency (fb1).

[0273] Meanwhile, the switching unit control unit (925) can vary the switching frequency due to changes in the load of the output terminal of the converter (910), etc.

[0274] For example, the switching control unit (925) can reduce the switching frequency when the load on the output terminal of the converter (910) increases.

[0275] As another example, the switching control unit (925) can increase the switching frequency when the load on the output terminal of the converter (910) increases.

[0276] Next, the switching unit control unit (925) determines whether the resonant current decreases during the switching frequency decrease (S1015), and if so, determines that it is an abnormal operation and controls the switching operation to stop in order to protect the circuit elements (S1025).

[0277] Accordingly, the converter (910) temporarily stops operation, thereby reducing the possibility of damage to circuit elements within the converter (910), particularly, the resonant capacitor (Cr).

[0278] Meanwhile, the switching unit control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to stop when the switching frequency of the first switching element (SW1) and the second switching element (SW2) decreases from the first frequency (fb1) to the second frequency (fb2) and the level of the current (ir) flowing in the resonant inductor (Lr) decreases from the first level (ib1) to the second level (ib4). Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0279] Meanwhile, the switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases while the output voltage (Vd) of the converter (910) increases. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0280] Meanwhile, the switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases while the output voltage (Vd) of the converter (910) increases from the first display driving voltage (Vb1) to the second display driving voltage (Vb2). Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0281] Meanwhile, the converter (910) can output a first display driving voltage (Vb1) when the display power control is on mode, and can output a second display driving voltage (Vb2) higher than the first display driving voltage (Vb1) when the display power control is off mode.

[0282] For example, the signal processing device (170) can control the power supply unit (190) to supply the first display driving voltage (Vb1) to the display (180) when the display power control on mode is selected within the setting screen, and can control the power supply unit (190) to supply the second display driving voltage (Vb2) to the display (180) when the display power control off mode is selected within the setting screen. Accordingly, various display driving voltages can be output.

[0283] Meanwhile, the switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing in the resonant inductor (Lr) decreases during the transition from the display power control on mode to the display power control off mode. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0284] Meanwhile, the converter (910) can output a first display driving voltage (Vb1) when the video output mode is an eco mode or a standard mode, and can output a second display driving voltage (Vb2) higher than the first display driving voltage (Vb1) when the video output mode is a movie mode or a game mode.

[0285] Meanwhile, the switching unit control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to stop when the current (ir) flowing in the resonant inductor (Lr) decreases while the video output mode is switched from the eco mode or the standard mode to the movie mode or the game mode. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0286] Meanwhile, the converter (910) can output a first display driving voltage (Vb1) when a black image is displayed on the display (180), and can output a second display driving voltage (Vb2) higher than the first display driving voltage (Vb1) when a white image is displayed on the display (180).

[0287] Meanwhile, the switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped when the current (ir) flowing through the resonant inductor (Lr) decreases while a black image is displayed on the display (180) and then a white image is displayed. Accordingly, the possibility of damage to the circuit elements can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0288] Figures 11a to 11c are drawings referred to in the description of Figure 10.

[0289] First, Fig. 11a is a diagram illustrating the current (irm) flowing in the resonant inductor (Lr) corresponding to the switching frequency (fsm) of the first switching element (SW1) and the second switching element (SW2).

[0290] Referring to the drawing, the switching unit control unit (925) can control the switching frequency (fs) to maintain the first switching frequency (fb1) and then decrease at the time point Tc1.

[0291] For example, the switching control unit (925) can control the output voltage (Vd) of the converter (910) to maintain the first display driving voltage (Vb1) and then increase at a time point Tc1, and the switching frequency (fs) to maintain the first switching frequency (fb1) and then decrease at a time point Tc1.

[0292] Meanwhile, the switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to stop when the current (ir) flowing in the resonant inductor (Lr) decreases while the switching frequency (fsm) of the first switching element (SW1) and the second switching element (SW2) decreases.

[0293] In the drawing, from the time point Tc1, the current (irm) flowing in the resonant inductor (Lr) decreases from the first level (ib1) to the second level (ib4) while the switching frequency (fsm) decreases.

[0294] The switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped immediately at the time Tcm when the current (irm) flowing in the resonant inductor (Lr) decreases from the first level (ib1) to the second level (ib4) while the switching frequency (fsm) decreases from the time Tc1.

[0295] Accordingly, during a temporary period from Tcm to Tcn, switching of the first switching element (SW1) and the second switching element (SW2) may be stopped, so that the switching frequency may become zero.

[0296] Additionally, during a temporary period from Tcm to Tcn, switching of the first switching element (SW1) and the second switching element (SW2) is stopped, so that the current (irm) flowing in the resonant inductor (Lr) can become zero.

[0297] Accordingly, the possibility of damage to circuit elements within the converter (910) can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0298] Figure 11b illustrates an example of the input voltage (Vrn) of the converter (910).

[0299] Referring to the drawing, up to the point Tc1 in FIG. 11a, the input voltage of the converter (910) gradually increases and can be maintained approximately constant during the period between Tc1 and Tcm.

[0300] For example, the switching unit control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to stop immediately at the time point Tcm when the current (irm) flowing in the resonant inductor (Lr) decreases from the first level (ib1) to the second level (ib4) while the switching frequency (fsm) decreases while the input voltage of the converter (910) is maintained approximately constant.

[0301] As another example, the switching control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to stop immediately at the time point Tcm when the input voltage of the converter (910) momentarily increases after the time point Tb1, the switching frequency (fsm) decreases, and the current (irm) flowing in the resonant inductor (Lr) decreases from the first level (ib1) to the second level (ib4), as shown in FIG. 9c.

[0302] Accordingly, the possibility of damage to circuit elements within the converter (910) can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0303] Figure 11c illustrates the current (irn) flowing in the resonant inductor (Lr).

[0304] Referring to the drawing, the current (irn) flowing in the resonant inductor (Lr) flows until the Tcm point, but after the Tcm point, the switching operation stops, and the current (irn) flowing in the resonant inductor (Lr) becomes zero.

[0305] FIG. 12 is a flowchart showing an operation method of an image display device according to another embodiment of the present disclosure.

[0306] Referring to the drawing, a power supply unit (190) according to one embodiment of the present disclosure operates a converter (910) (S1010).

[0307] Next, the switching unit control unit (925) can determine whether the switching frequency of the first switching element (SW1) and the second switching element (SW2) is outside the first allowable range (S1215).

[0308] For example, the switching unit control unit (925) may determine that the switching frequency is outside the first allowable range when the switching frequency varies even when there is no load fluctuation.

[0309] As another example, the switching unit control unit (925) may determine that the switching frequency is outside the first allowable range when the output voltage (Vd) of the converter (910) increases from the first display driving voltage (Vb1) to the second display driving voltage (Vb2) according to load fluctuations.

[0310] Next, the switching unit control unit (925) determines whether the current (ir) flowing in the resonant inductor (Lr) is outside the second allowable range when the switching frequency is outside the first allowable range (S1220), and if so, can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped (S1225).

[0311] For example, when the output voltage (Vd) of the converter (910) increases from the first display driving voltage (Vb1) to the second display driving voltage (Vb2), and the current (ir) flowing in the resonant inductor (Lr) decreases, the switching control unit (925) can determine that the current (ir) flowing in the resonant inductor (Lr) is outside the second allowable range.

[0312] In this case, the switching unit control unit (925) can control the switching of the first switching element (SW1) and the second switching element (SW2) to be stopped. Accordingly, the possibility of damage to the circuit elements within the converter (910) can be reduced. In particular, the possibility of damage to the resonant capacitor (Cr) can be reduced.

[0313] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. Display; A signal processing device that outputs a video signal to the above display; A power supply unit including a converter that supplies a display driving voltage to the display; The above converter, Transformers; A first switching element and a second switching element are arranged at the input terminal of the transformer and are connected in series with each other; A resonant capacitor and a resonant inductor, each connected between the input terminal of the transformer and the second switching element; A switching control unit that controls the first switching element and the second switching element; The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the switching frequency of the first switching element and the second switching element decreases.

2. In paragraph 1, The above converter, A voltage detection unit that detects the voltage of the above resonant capacitor; Further comprising a current detection unit for detecting the current flowing in the resonant inductor; The above switching unit control unit, An image display device that calculates a switching frequency based on a detected voltage from the voltage detection unit, and controls switching of the first switching element and the second switching element to stop when the current detected by the current detection unit decreases while the calculated switching frequency decreases.

3. In paragraph 1, The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the switching frequency of the first switching element and the second switching element decreases from a first frequency to a second frequency and the level of current flowing in the resonant inductor decreases from a first level to a second level.

4. In paragraph 1, The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the output voltage of the converter increases.

5. In paragraph 4, The above converter, Further comprising an output voltage detection unit for detecting the output voltage of the converter; The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the detection voltage from the output voltage detection unit increases.

6. In paragraph 1, The above switching unit control unit, An image display device, wherein when the output voltage of the converter increases from the first display driving voltage to the second display driving voltage and the current flowing in the resonant inductor decreases, the switching of the first switching element and the second switching element is controlled to stop.

7. In paragraph 6, The above signal processing device, Within the settings screen, when the display power control on mode is selected, the power supply unit is controlled to supply the first display driving voltage to the display, A display device, wherein, in the above setting screen, when the display power control off mode is selected, the power supply unit controls the second display driving voltage to be supplied to the display.

8. In paragraph 6, The above switching unit control unit, An image display device, wherein when the current flowing in the resonant inductor decreases while switching from the display power control on mode to the display power control off mode, the switching of the first switching element and the second switching element is controlled to stop.

9. In paragraph 6, The above switching unit control unit, A display device in which, when the current flowing through the resonant inductor decreases while the video output mode is switched from eco mode or standard mode to movie mode or game mode, the switching of the first switching element and the second switching element is controlled to stop.

10. In paragraph 1, The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the switching frequency is outside the first allowable range and the current flowing in the resonant inductor is outside the second allowable range.

11. In paragraph 1, The above switching unit control unit, An image display device in which, when the input voltage input to the converter increases and the switching frequency of the first switching element and the second switching element decreases, the switching of the first switching element and the second switching element is controlled to stop when the current flowing in the resonant inductor decreases.

12. In paragraph 1, The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the load of the output terminal of the converter increases.

13. In paragraph 1, The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing through the resonant inductor decreases while a black image is displayed on the display and then a white image is displayed.

14. Display; A signal processing device that outputs a video signal to the above display; A power supply unit including a converter that supplies a display driving voltage to the display; The above converter, Transformers; A first switching element and a second switching element are arranged at the input terminal of the transformer and are connected in series with each other; A resonant capacitor and a resonant inductor, each connected between the input terminal of the transformer and the second switching element; A switching control unit that controls the first switching element and the second switching element; The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the output voltage of the converter increases.

15. In paragraph 14, The above converter, Further comprising an output voltage detection unit for detecting the output voltage of the converter; The above switching unit control unit, An image display device that controls switching of the first switching element and the second switching element to stop when the current flowing in the resonant inductor decreases while the detection voltage from the output voltage detection unit increases.

Images