Display device and operating method thereof

Abstract

An electronic device according to an embodiment of the present disclosure may comprise: a first detection circuit for outputting a signal indicating whether a first adapter is connected; and, in the state in which the first adapter and a second adapter simultaneously connected, a main board for detecting disconnection of the first adapter on the basis of the signal output from the first detection circuit, and switching a power source of the electronic device from the first adapter to the second adapter in response to the detection of the disconnection of the first adapter.

Description

Display device and method of operation thereof

[0001] The present disclosure relates to a display device, and more particularly, to a stand-type display device.

[0002] Stand-type display devices feature unique designs and convenient features, providing users with a new type of viewing experience.

[0003] Stand-type display devices feature wheels, allowing them to be easily moved around the home. This allows for convenient use in a variety of spaces, including the kitchen, living room, and bedroom.

[0004] Additionally, stand-type display devices can rotate their screens 90 degrees, allowing them to be used in both portrait and landscape modes. This provides a useful advantage for viewing photos, working with documents, and using social media.

[0005] Additionally, stand-type display devices can adjust the height and angle of the screen, allowing for convenient viewing according to the user's line of sight.

[0006] Stand-type display devices can be powered in a variety of ways. For example, stand-type display devices can be powered by a DC (Direct Current) adapter, a USB PD (Universal Serial Bus Power Delivery) adapter, or a battery.

[0007] The connection of the DC adapter is detected through the power board, and the detected signal is transmitted to the main board.

[0008] Whether a USB PD adapter is connected or not is detected using the PD communication chip installed on the main board.

[0009] The battery's capacity and charging status are checked through the charging board installed on the main board.

[0010] When a DC adapter and a USB PD (Power Delivery) adapter are simultaneously connected to a stand-type display device and the DC adapter is disconnected, the power is switched to the USB PD (Power Delivery) adapter to ensure smooth power supply.

[0011] However, the natural discharge time of the capacitor inside the DC adapter or the capacitor on the path from the DC adapter to the main board is delayed, which causes a problem in that the switching to the USB PD adapter is delayed.

[0012] Additionally, when either a DC adapter or a USB PD adapter is connected to a stand-type display device, the battery discharges due to pre-boost operation. This causes frequent battery recharge cycles.

[0013] An object of the present disclosure may be to quickly detect whether a DC adapter is disconnected (or blocked) by monitoring the output voltage of the DC adapter.

[0014] An object of the present disclosure may be to quickly detect a disconnection of a DC adapter and switch the power source to another adapter.

[0015] An object of the present disclosure may be to prevent battery discharge by turning off the power of a pre-boost IC (or boost circuit) when either a DC adapter or a USB PD adapter is connected to a display device.

[0016] An electronic device according to an embodiment of the present disclosure may include a first detection circuit that outputs a signal indicating whether a first adapter is connected; and a main board that detects, when the first adapter and the second adapter are simultaneously connected, that the first adapter is disconnected based on the signal output from the first detection circuit, and switches the power source of the electronic device from the first adapter to the second adapter upon detecting that the first adapter is disconnected.

[0017] An operating method of an electronic device according to an embodiment of the present disclosure may include a step of outputting a signal indicating whether a first adapter is connected, a step of detecting that the first adapter is disconnected based on the signal output from the first detection circuit while the first adapter and the second adapter are simultaneously connected, and a step of switching a power source of the electronic device from the first adapter to the second adapter upon detecting that the first adapter is disconnected.

[0018] According to an embodiment of the present disclosure, the output voltage of a DC adapter can be monitored, and whether the DC adapter is powered off can be quickly determined through an output signal based on the monitoring results. Accordingly, the delay in detection time required to detect whether the DC adapter is powered on can be improved due to discharge of a capacitor present inside the DC adapter or a capacitor in a path connecting the DC adapter to the charging board.

[0019] According to an embodiment of the present disclosure, when the DC adapter and the USB PD adapter are simultaneously connected and the DC adapter is disconnected, power can be smoothly supplied to components of the display device as the power source is quickly switched to the USB PD adapter.

[0020] According to an embodiment of the present disclosure, when either a DC adapter or a USB PD adapter is connected to a display device, power applied to the boost circuit can be cut off through the boost cutoff circuit.

[0021] Accordingly, the power required for boost operation is eliminated, preventing the battery from discharging. By preventing the battery from discharging, the battery's recharge cycle is reduced, thereby resolving issues related to battery overheating and reduced lifespan.

[0022] FIG. 1A and FIG. 1B are drawings explaining the structure of a display device according to an embodiment of the present disclosure.

[0023] FIG. 2 is a block diagram illustrating the configuration of a display device according to one embodiment of the present disclosure.

[0024] FIG. 3 is a drawing illustrating the configuration of a display device according to an embodiment of the present disclosure.

[0025] FIG. 4 is a drawing illustrating the configuration of a charging board according to an embodiment of the present disclosure.

[0026] FIG. 5 is a diagram illustrating a circuit diagram of a detection circuit according to an embodiment of the present disclosure.

[0027] FIG. 6 is a diagram explaining the operating principle of an LDO circuit according to an embodiment of the present disclosure.

[0028] FIG. 7 is a flowchart for explaining an operating method of a display device according to an embodiment of the present disclosure.

[0029] FIG. 8 is a block diagram showing the configuration of a head according to another embodiment of the present disclosure.

[0030] FIG. 9 is a flowchart illustrating an operating method of a display device according to another embodiment of the present disclosure.

[0031] FIG. 10 is a drawing illustrating the configuration of a head of another embodiment of the present disclosure.

[0032] FIG. 11 is a diagram illustrating a circuit diagram of a second detection circuit and a boost blocking circuit according to one embodiment of the present disclosure.

[0033] FIG. 12 is a flowchart for explaining an operating method of a display device according to another embodiment of the present disclosure.

[0034] FIG. 13 is a flowchart for explaining an operating method of a display device according to another embodiment of the present disclosure.

[0035] FIG. 14 is a drawing illustrating an effect that occurs when a disconnection of a DC adapter is detected using a detection circuit according to an embodiment of the present disclosure.

[0036] Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. The suffixes "module" and "part" used in the following description for components are assigned or used interchangeably solely for the convenience of writing the specification, and do not in themselves have distinct meanings or roles.

[0037] The direction indications of up (U), down (D), left (Le), right (Ri), front (F), and back (R) shown in the drawings are only for convenience of explanation, and the technical ideas disclosed in this specification are not limited thereby.

[0038] A display device according to an embodiment of the present invention is, for example, an intelligent display device that adds computer-assisted functionality to its broadcast reception function. While faithfully performing the broadcast reception function, it can also be equipped with Internet functionality and other features, providing a more user-friendly interface, such as a manual input device, touch screen, or space remote control. Furthermore, with support for wired or wireless Internet functionality, it can connect to the Internet and a computer, enabling functions such as email, web browsing, banking, or gaming. A standardized, general-purpose operating system can be used for these various functions.

[0039] Accordingly, the display device described in the present invention can perform a variety of user-friendly functions, for example, since various applications can be freely added or deleted on a general-purpose operating system kernel. More specifically, the display device can be a network TV, HBB TV, smart TV, LED TV, OLED TV, etc., and in some cases, it can also be applied to smartphones.

[0040] FIG. 1A and FIG. 1B are drawings explaining the structure of a display device according to an embodiment of the present disclosure.

[0041] Referring to FIGS. 1A and 1B, the display device (1) may include a head (10). The head (10) may include a display panel that displays an image.

[0042] The head (10) may include a first long side (LS1), a second long side (LS2) opposite the first long side (LS1), a first short side (SS1) adjacent to the first long side (LS1) and the second long side (LS2), and a second short side (SS2) opposite the first short side (SS1).

[0043] Meanwhile, for convenience of explanation, the lengths of the first and second long sides (LS1, LS2) are illustrated and described as being longer than the lengths of the first and second short sides (SS1, SS2), but it may also be possible for the lengths of the first and second long sides (LS1, LS2) to be approximately equal to the lengths of the first and second short sides (SS1, SS2).

[0044] The direction parallel to the short sides (SS1, SS2) of the head (10) may be referred to as the up-down direction or the first direction (DR1). The direction parallel to the long sides (LS1, LS2) of the head (10) may be referred to as the left-right direction or the second direction (DR2). The direction perpendicular to the short sides (SS1, SS2) and long sides (LS1, LS2) of the head (10) may be referred to as the front-back direction or the third direction (DR3).

[0045] The direction in which the head (10) displays the image may be referred to as the forward (F, z), and the opposite direction may be referred to as the backward (R). The first short side (SS1) may be referred to as the left (Le, x). The second short side (SS2) may be referred to as the right (Ri). The first long side (LS1) may be referred to as the upper side (U, y). The second long side (LS2) may be referred to as the lower side (D).

[0046] The first long side (LS1), the second long side (LS2), the first short side (SS1), and the second short side (SS2) may be referred to as edges of the head (10). The point where the first long side (LS1), the second long side (LS2), the first short side (SS1), and the second short side (SS2) meet may be referred to as a corner. The point where the first short side (SS1) and the first long side (LS1) meet may be a first corner (C1). The point where the first short side (SS1) and the second long side (LS2) meet may be a second corner (C2). The point where the second short side (SS2) and the second long side (LS2) meet may be a third corner (C3). The point where the second short side (SS2) and the first long side (LS1) meet may be a fourth corner (C4).

[0047] The display device (1) may include a stand (20, 30, 40, 50) that supports the head (10).

[0048] The stand (20, 30, 40, 50) may include a base (20), a pole (30), a swivel connector (40), and a support arm (50).

[0049] The stand (20, 30, 40, 50) can be detachably connected to the head (10).

[0050] The base (20) can be placed on the ground. The base (20) can be round or angular. A plurality of wheels (20W) can be provided on the lower surface of the base (20).

[0051] The plug (CWa) connected to the power cable (CW) can be connected to a concentric plug that supplies external power.

[0052] The jack (CWb) of the power cable (CW) can be connected to the base (20).

[0053] A battery (not shown) may be built into the base (20), pole (30), support arm (50), and / or head (10) and may be charged by power supplied through a power cable (CW). The display device (1) may be powered by the battery and operated while being separated from the power cable (CW).

[0054] The pole (30) can extend vertically from the base (20). The lower end of the pole (30) can be connected to the pole (30) adjacent to the periphery of the base (20).

[0055] The support arm (50) can extend in a direction intersecting the pole (30) and can be coupled to the upper end of the pole (30). The rotary connector (40) can be positioned between the head (10) and the support arm (50) and can be coupled to the head (10) and the support arm (50).

[0056] The head (10) can be supported by a stand (20, 30, 40, 50) and can be spaced upward from the ground.

[0057] The rotary connector (40) can rotate the head (10) up and down or left and right. When an external force is applied to the rotary connector (40), the head (10) can rotate in one or more of the up / down / left / right directions.

[0058] The rotary connector (40) and head (10) may have a detachable structure.

[0059] FIG. 2 is a block diagram illustrating the configuration of a display device according to one embodiment of the present disclosure.

[0060] Referring to FIG. 2, the display device (1) may include a broadcast receiving unit (130), an external device interface (135), a memory (140), a user input interface (150), a controller (170), a wireless communication interface (173), a display (180), a speaker (185), and a power supply circuit (190).

[0061] Each of the broadcast receiving unit (130), external device interface (135), memory (140), user input interface (150), controller (170), wireless communication interface (173), display (180), speaker (185), and power supply circuit (190) may be provided in the head (10). However, it is not necessary to be limited thereto, and some components may be provided in the stand (20, 30, 40, 50).

[0062] The broadcast receiving unit (130) may include a tuner (131), a demodulator (132), and a network interface (133).

[0063] The tuner (131) can select a specific broadcast channel according to a channel selection command. The tuner (131) can receive a broadcast signal for the selected specific broadcast channel.

[0064] The demodulator (132) can separate the received broadcast signal into a video signal, an audio signal, and a data signal related to the broadcast program, and can restore the separated video signal, audio signal, and data signal into a form that can be output.

[0065] The external device interface (135) can receive an application or a list of applications within an adjacent external device and transmit it to the controller (170) or memory (140).

[0066] The external device interface (135) can provide a connection path between the display device (1) and the external device. The external device interface (135) can receive one or more of images and audio output from an external device connected wirelessly or wiredly to the display device (1) and transmit them to the controller (170).

[0067] The external device interface (135) may include a plurality of external input terminals. The plurality of external input terminals may include an RGB terminal, one or more HDMI (High Definition Multimedia Interface) terminals, and a component terminal.

[0068] A video signal of an external device input through an external device interface (135) can be output through a display (180). A voice signal of an external device input through an external device interface (135) can be output through a speaker (185).

[0069] An external device that can be connected to the external device interface (135) may be any one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB memory, and a home theater, but this is only an example.

[0070] The external device interface (135) may be provided on one or more of the head (10) or the stand (20, 30, 40, 50).

[0071] The network interface (133) can provide an interface for connecting the display device (1) to a wired / wireless network including the Internet.

[0072] The network interface (133) can transmit or receive data to or from other users or other electronic devices via the connected network or another network linked to the connected network.

[0073] The network interface (133) can transmit some content data stored in the display device (1) to a selected user or electronic device among other users or other electronic devices pre-registered in the display device (1).

[0074] The network interface (133) can access a predetermined web page via the connected network or another network linked to the connected network. The network interface (133) can access a predetermined web page via the network and transmit or receive data with the corresponding server.

[0075] The network interface (133) can receive content or data provided by a content provider or network operator. The network interface (133) can receive content such as movies, advertisements, games, VOD, broadcast signals, and other related information provided by a content provider or network provider via a network.

[0076] The network interface (133) can receive firmware update information and update files provided by the network operator, and can transmit data to the Internet or content provider or network operator.

[0077] The network interface (133) can select and receive a desired application from among applications open to the public via a network.

[0078] The memory (140) stores a program for each signal processing and control within the controller (170), and can store signal-processed image, voice, or data signals.

[0079] The memory (140) may perform a function for temporary storage of video, audio, or data signals input from an external device interface (135) or a network interface (133), and may also store information about a specific image through a channel memory function.

[0080] The memory (140) can store an application or a list of applications input from an external device interface (135) or a network interface (133).

[0081] The display device (1) can play content files (video files, still image files, music files, document files, application files, etc.) stored in the memory (140) and provide them to the user.

[0082] The user input interface (150) can transmit a signal input by the user to the controller (170) or transmit a signal from the controller (170) to the user. For example, the user input interface (150) can receive and process control signals such as power on / off, channel selection, and screen setting from the remote control device (200) according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF) communication, or infrared (IR) communication, or process control signals from the controller (170) to be transmitted to the remote control device (200).

[0083] The user input interface (150) can transmit control signals input from local keys (not shown) such as the power key, channel key, volume key, and setting value to the controller (170).

[0084] An image signal processed by the controller (170) can be input to the display (180) and displayed as an image corresponding to the image signal. An image signal processed by the controller (170) can be input to an external output device through an external device interface (135).

[0085] The voice signal processed by the controller (170) can be output as audio to the speaker (185). The voice signal processed by the controller (170) can be input to an external output device through the external device interface (135).

[0086] In addition, the controller (170) can control the overall operation within the display device (1).

[0087] The controller (170) can control the display device (1) by a user command or an internal program input through the user input interface (150), and can connect to a network to enable the user to download a desired application or application list into the display device (1).

[0088] The controller (170) enables the user-selected channel information, etc. to be output through a display (180) or speaker (185) together with processed video or audio signals.

[0089] The controller (170) allows a video signal or audio signal from an external device, for example, a camera or camcorder, input through the external device interface (135) to be output through the display (180) or speaker (185) in accordance with an external device video playback command received through the user input interface (150).

[0090] The controller (170) can control the display (180) to display an image, for example, a broadcast image input through a tuner (131), an external input image input through an external device interface (135), an image input through a network interface, or an image stored in a memory (140) can be controlled to be displayed on the display (180). In this case, the image displayed on the display (180) can be a still image or a moving image, and can be a 2D image or a 3D image.

[0091] The controller (170) can control the playback of content stored in the display device (1), received broadcast content, or external input content input from outside, and the content can be in various forms such as broadcast video, external input video, audio file, still image, connected web screen, and document file.

[0092] The wireless communication interface (173) can communicate with an external device through wired or wireless communication. The wireless communication interface (173) can perform short-range communication with the external device. To this end, the wireless communication interface (173) can support short-range communication using at least one of Bluetooth™, RFID (Radio Frequency Identification), Infrared Data Association (IrDA), UWB (Ultra Wideband), ZigBee, NFC (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies.

[0093] The wireless communication interface (173) can support wireless communication between the display device (1) and a wireless communication system, between the display device (1) and another display device (1), or between the display device (1) and a network in which the display device (100, or an external server) is located via a wireless area network. The wireless area network can be a wireless personal area network.

[0094] The wireless communication interface (173) can detect (or recognize) a wearable device capable of communication around the display device (1).

[0095] If the detected wearable device is a device certified to communicate with the display device (1) according to the present invention, the controller (170) can transmit at least a portion of the data processed in the display device (1) to the wearable device via the wireless communication interface (173). Accordingly, a user of the wearable device can utilize the data processed in the display device (1) via the wearable device.

[0096] The display (180) can generate a driving signal by converting a video signal, data signal, OSD signal processed by the controller (170) or a video signal, data signal, etc. received from an external device interface (135) into R, G, and B signals, respectively.

[0097] Meanwhile, since the display device (1) illustrated in FIG. 2 is merely an embodiment of the present invention, some of the illustrated components may be integrated, added, or omitted depending on the specifications of the display device (1) actually implemented.

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

[0099] According to another embodiment of the present invention, the display device (1) may receive and play an image through a network interface (133) or an external device interface (135) without having a tuner (131) and a demodulator (132), unlike as shown in FIG. 2.

[0100] For example, the display device (1) may be implemented separately as an image processing device, such as a set-top box, for receiving contents according to broadcast signals or various network services, and a content playback device for playing contents input from the image processing device.

[0101] In this case, the operating method of the display device according to the embodiment of the present invention to be described below may be performed by any one of the display device (1) described with reference to FIG. 2, as well as an image processing device such as the separated set-top box, or a content playback device having a display (180) and a speaker (185).

[0102] FIG. 3 is a drawing illustrating the configuration of a display device according to an embodiment of the present disclosure.

[0103] Referring to FIG. 3, the display device (1) may include a stand (20, 30, 40, 50) and a head (10).

[0104] The stand (20, 30, 40, 50) may include a base (20), a pole (30), a swivel connector (40), and a support arm (50).

[0105] The stand (20, 30, 40, 50) can be detachably connected to the head (10).

[0106] The base (20) may include a power board (21). That is, the power board (21) may be built into the base (20). The power board (21) may receive AC power from an external power source connected via a plug (CWa) and convert the received AC power into DC power. The power board (21) may supply DC power to the head (10) via one or more pogo pins (41, 43) included in the connector (40).

[0107] The power board (21) may include a DC adapter (21a) capable of converting AC power into DC power. In another embodiment, the DC adapter (21a) may be provided separately from the power board (21).

[0108] The power board (21) can detect whether the DC adapter (21a) is connected and generate a detection signal based on the detection result. The power board (21) can transmit the generated detection signal to the main board (19).

[0109] The rotary connector (40) may include one or more pogo pins (41, 43). The one or more pogo pins (41, 43) may be pins that electrically connect the head (10) and the stand (20, 30, 40, 50).

[0110] In Fig. 3, the rotary connector (40) is described as having two pogo pins (41, 43), but this is only an example.

[0111] One or more pogo pins (41, 43) may be connected to a head connector (11) comprising one or more contact terminals that make contact with one or more pogo pins (41, 43). The head connector (11) may be a pogo pin socket into which the pogo pins (41, 43) are inserted to form electrical contact.

[0112] The head (10) may include a head connector (11), a charging board (13), a battery (15), a backlight driving circuit (17), a main board (19), and a display (180).

[0113] The head connector (11) may include one or more contact terminals for electrical contact with one or more pogo pins (41, 43). The head connector (11) may provide direct current power supplied from one or more pogo pins (41, 43) to the charging board (13) via the one or more contact terminals. The head connector (11) may be an interface for electrical connection between one or more pogo pins (41, 43) and the charging board (13).

[0114] The charging board (13) can provide direct current power supplied from the power board (21) to components provided in the head (10).

[0115] The charging board (13) can provide direct current power supplied from the power board (21) to one or more of the battery (15), the backlight driving circuit (17), or the main board (19).

[0116] The battery (15) can supply direct current power to one or more of the backlight driving circuit (17) or the main board (19).

[0117] The battery (15) may be included in the charging board (13) or may be provided separately from the charging board (13).

[0118] The battery (15) can supply DC power to the head (10) through discharge when the DC adapter (21a) and USB PD adapter (310) are separated from the head (10).

[0119] The backlight driving circuit (17) may be a circuit for driving the backlight of the display (180). The display (180) may include a liquid crystal display panel and a backlight that outputs light to the liquid crystal display panel. The backlight driving circuit (17) may control the light output of the backlight based on a dimming value.

[0120] The main board (19) can control the overall operation of the head (10). The main board (19) can be equipped with one or more processors. Each of the one or more processors can be composed of one chip.

[0121] The display (180) can display an image. If the display (180) includes an organic light emitting diode (OLED) display panel, the backlight driving circuit (17) may not be included in the head (10).

[0122] The head (10) may further include a USB terminal (14) for connection with a USB device.

[0123] A USB PD adapter (310) can be connected to the USB terminal (14) via a USB cable. The USB PD adapter (310) can supply direct current power to the head (10) via the USB terminal (14).

[0124] The USB PD adapter (310) can convert AC power into DC power and supply the converted DC power to the head (10).

[0125] The PD communication chip (19a) provided on the main board (19) can detect whether a USB PD adapter (310) is connected.

[0126] The specific operation of the main board (19) will be described later.

[0127] FIG. 4 is a drawing illustrating the configuration of a charging board according to an embodiment of the present disclosure.

[0128] The charging board (13) may include a DC / DC converter (DC / DC converter, 410), a charging circuit (430), a boost circuit (450), and a detection circuit (470).

[0129] The DC / DC converter (410) can convert the direct current power transmitted from the power board (21) into a constant voltage and supply the converted constant voltage to the main board (19).

[0130] For example, the DC / DC converter (410) can step down a DC voltage of 20 V to 13 V and supply the stepped down DC voltage of 13 V to the main board (19).

[0131] The charging circuit (430) can charge the battery (15) using direct current power transmitted from the power board (21). The charging circuit (430) can control charging or discharging of the battery (15). The charging circuit (430) can include a battery management system integrated circuit (BMS IC) for controlling charging or discharging of the battery (15).

[0132] The charging circuit (430) can charge the battery (15) according to a charge on signal received from the main board (19), and can stop charging the battery (15) according to a charge off signal.

[0133] The boost circuit (450) can change the output voltage of the battery (15) to a preset voltage and provide the changed voltage to the DC / DC converter (410). The boost circuit (450) can increase the output voltage of the battery (15) to a preset voltage and output the preset voltage.

[0134] For example, the boost circuit (450) can convert the output voltage of the battery (15) into a DC voltage of 17.5 V and output a DC voltage of 17.5 V.

[0135] The detection circuit (470) may include one or more Zener diodes and LDO (Low DropOut) circuits.

[0136] FIG. 5 is a diagram illustrating a circuit diagram of a detection circuit according to an embodiment of the present disclosure.

[0137] Referring to FIG. 5, the detection circuit (470) may include a Zener diode (510) and an LDO circuit (530). The detection circuit (470) may further include a plurality of resistors (R246, R247) and a capacitor (C244) connected between the Zener diode (510) and the LDO circuit (530).

[0138] An input voltage input to the charging board (13) through the pogo pins (41, 43) can be applied to the cathode terminal of the Zener diode (510). One end of a resistor (R246) can be connected to the anode terminal of the Zener diode (510).

[0139] The detection circuit (470) may further include a capacitor (C245) connected between the LDO circuit (530) and the ACD pin (ACD).

[0140] The Zener diode (510) may be a diode designed to allow current to flow in the reverse direction at a specific voltage (or Zener voltage). The Zener voltage of the Zener diode (510) may be 15.5 V.

[0141] When 20 V output from the pogo pin (41, 43) is input to the cathode terminal of the Zener diode (510), 4.5 V, which is obtained by subtracting 15.5 V, the Zener voltage, from 20 V, can be applied to the LDO circuit (530).

[0142] The LDO circuit (530) may be a circuit that outputs a preset voltage when the input voltage is higher than a specific voltage. The LDO circuit (530) may output 3.3 V when the input voltage is higher than 3.5 V, and may reduce the output voltage output according to the input voltage when the input voltage is lower than 3.5 V. The LDO circuit (530) may linearly reduce the output voltage output according to the input voltage when the input voltage is lower than 3.5 V.

[0143] FIG. 6 is a diagram explaining the operating principle of an LDO circuit according to an embodiment of the present disclosure.

[0144] Referring to FIG. 6, a graph (600) showing the relationship between the input voltage and the output voltage of the LDO circuit (530) is illustrated.

[0145] The horizontal axis of the graph (600) may represent the input voltage of the LDO circuit (530), and the vertical axis of the graph (600) may represent the output voltage output by the LDO circuit (530).

[0146] The LDO circuit (530) can output a constant voltage of 3.3 V when the input voltage is 3.5 V or higher. The LDO circuit (530) can output an output voltage proportional to the input voltage when the input voltage is less than 3.5 V.

[0147] When the input voltage of the LDO circuit (530) is 3.5 V to 4.5 V, the output voltage of the LDO circuit (530) is always 3.3 V, but when the input voltage is less than 3.5 V, the output voltage may also decrease in proportion to the input voltage, as shown in the graph (600).

[0148] When a DC voltage of 20 V is applied to the detection circuit (470), a DC voltage of 4.5 V can be applied to the LDO circuit (530) by a Zener diode (510) having a Zener voltage of 15.5 V. Since the input voltage of the LDO circuit (530) is 3.5 V or higher, it can output 3.3 V.

[0149] When a DC voltage of 18 V is applied to the detection circuit (470), a DC voltage of 2.5 V can be applied to the LDO circuit (530) by a Zener diode (510) having a Zener voltage of 15.5 V. Since the input voltage of the LDO circuit (530) is less than 3.5 V, it can output 1.7 V according to the graph (600).

[0150] The output voltage of the LDO circuit (530) may be the output voltage of the detection circuit (470).

[0151] FIG. 7 is a flowchart for explaining an operating method of a display device according to an embodiment of the present disclosure.

[0152] Hereinafter, the display device (1) may be referred to as an electronic device (1).

[0153] The main board (19) may be referred to as a main processor (19).

[0154] The fact that the DC adapter (21a) is connected to the display device (1) or head (10) may indicate that the display device (1) or head (10) is receiving direct current power from the DC adapter (21a).

[0155] The fact that a USB PD adapter (310) is connected to a display device (1) or a head (10) may indicate that the display device (1) or the head (10) is receiving direct current power from the USB PD adapter (310).

[0156] Referring to Fig. 7, the main board (19) of the display device (1) can determine whether each of the DC adapter (21a) and the USB PD adapter (310) is connected (S701).

[0157] The main board (19) can determine whether the DC adapter (21a) is connected based on an output signal output by a detection circuit (470) provided in the charging board (13). When the main board (19) receives a high signal from the detection circuit (470), it can determine that the DC adapter (21a) is connected to the head (10), and when it receives a low signal, it can determine that the DC adapter (21a) is not connected to the head (10).

[0158] The main board (19) can determine whether the USB PD adapter (310) is connected based on a detection signal detected by the PD communication chip (19a). The PD communication chip (19a) can determine whether the USB PD adapter (310) is connected based on a resistance detected through a configuration channel (CC) pin of the USB terminal (14).

[0159] The PD communication chip (19a) can determine that a USB PD adapter (310) is connected when the resistance detected through the configuration channel (CC) pin of the USB terminal (14) is a specific value or higher.

[0160] The main board (19) can switch power to the DC adapter (21a) (S705) when it is determined that the DC adapter (21a) and the USB PD adapter (310) are connected to the display device (1) simultaneously (S703).

[0161] When the main board (19) determines that the DC adapter (21a) and the USB PD adapter (310) are simultaneously connected to the display device (1), the main board (19) can determine the DC adapter (21a) as a power source to supply direct current power to the head (10) through the DC adapter (21a).

[0162] This is because the DC adapter (21a) has a larger power capacity and better power stability than the USB PD adapter (310).

[0163] The main board (19) can control an adapter switch (800) to be described later so that the DC power provided from the DC adapter (21a) is supplied to the battery (15). The adapter switch (800) may be a switch circuit that selectively connects either the DC adapter (21a) or the USB adapter (21a) to the charging circuit (430).

[0164] The main board (19) can obtain the output signal of the detection circuit (470) (S707).

[0165] The main board (19) can periodically obtain the output signal of the detection circuit (470) after the power is switched on by the DC adapter (21a). The main board (19) can obtain the output signal of the detection circuit (470) to detect whether the DC adapter (21a) is disconnected.

[0166] The detection circuit (470) can obtain the output voltage of the DC adapter (21a) as an input voltage. The detection circuit (470) can output a high signal or a low signal based on the input voltage.

[0167] In one embodiment, when the output voltage of the detection circuit (470) is 3.3 V or higher, the detection circuit (470) can output a high signal, and when the output voltage of the detection circuit (470) is less than 3.3 V, the detection circuit (470) can output a low signal.

[0168] In another embodiment, when the output voltage of the detection circuit (470) is 3.3 V or higher, the detection circuit (470) can output a high signal, and when the output voltage of the detection circuit (470) is less than 2.7 V, the detection circuit (470) can output a low signal.

[0169] The main board (19) can determine whether the DC adapter (21a) is disconnected based on the acquired output signal (S709).

[0170] The main board (19) can determine that the connection of the DC adapter (21a) is maintained when the acquired output signal is a high signal.

[0171] The main board (19) can determine that the DC adapter (21a) is disconnected if the acquired output signal is a low signal.

[0172] If the main board (19) determines that the DC adapter (21a) is disconnected based on the acquired output signal, it can switch power to the USB PD adapter (310) (S711).

[0173] When the main board (19) determines that the DC adapter (21a) is disconnected, the power source can be switched from the DC adapter (21a) to the USB PD adapter (310). When the main board (19) determines that the DC adapter (21a) is disconnected, the main board (19) can control the adapter switch (800) to switch the power source to the USB PD adapter (310).

[0174] The adapter switch (800) can set the path of the DC power provided to the charging circuit (430) to the USB PD adapter (310) under the control of the main board (19).

[0175] The main board (19) can charge the battery (15) with a switched USB PD adapter (310) (S713).

[0176] In this way, according to the embodiment of the present disclosure, the output voltage of the DC adapter (21a) can be monitored, and whether the power of the DC adapter (21a) is removed can be quickly determined through an output signal according to the monitoring result.

[0177] Accordingly, the delay in the detection time required to detect whether the DC adapter (21a) is connected to power can be improved by discharging the capacitor existing inside the DC adapter (21a) or the capacitor in the path connecting the DC adapter (21a) to the charging board (13).

[0178] In addition, according to the embodiment of the present disclosure, as the detection time of the DC adapter (21a) is improved, power can be quickly switched to the USB PD adapter (310) so that power can be stably supplied to the battery (15) or the display (180).

[0179] Meanwhile, the main board (19) can charge the battery (15) with the connected adapter when only one of the DC adapter (21a) and the USB PD adapter (310) is connected to the display device (1) (S715).

[0180] The main board (19) can control the charging circuit (430) to charge the battery (15) with the connected adapter when only one of the DC adapter (21a) and the USB PD adapter (310) is connected to the display device (1).

[0181] The main board (19) can turn off the power of the boost circuit (450) when only one of the DC adapter (21a) and the USB PD adapter (310) is connected to the display device (1). This will be described later.

[0182] FIG. 8 is a block diagram showing the configuration of a head according to another embodiment of the present disclosure.

[0183] A head (10-1) of a display device (1) according to another embodiment of the present disclosure may include a DC adapter (21a), a detection circuit (470), a main board (19), an adapter switch (800), a charging circuit (430), and a battery (15).

[0184] The DC adapter (21a) can convert AC power into DC power and transmit the converted DC power to the adapter switch (800) or detection circuit (470).

[0185] The detection circuit (470) may include one or more Zener diodes and LDO (Low DropOut) circuits. The circuit configuration of the detection circuit (470) is as described in FIG. 5.

[0186] The detection circuit (470) can output a high signal when the output voltage of the LDO circuit (530) is above a certain voltage, and can output a low signal when the output voltage of the LDO circuit (530) is below a certain voltage.

[0187] The main board (19) can control the overall operation of the head (10-1). The main board (19) can detect whether the DC adapter (21a) is connected based on an output signal transmitted from the detection circuit (470).

[0188] The main board (19) can determine that the DC adapter (21a) is connected if the acquired output signal is a high signal.

[0189] The main board (19) can determine that the DC adapter (21a) is disconnected if the acquired output signal is a low signal.

[0190] The main board (19) can detect whether a USB PD adapter (310) is connected through the PD communication chip (19a).

[0191] The adapter switch (800) can supply DC power provided from either a DC adapter (21a) or a USB PD adapter (310) to the charging circuit (430).

[0192] The adapter switch (800) can determine the power supply path of the adapter according to the control of the main board (19).

[0193] The charging circuit (430) can receive direct current power from either a DC adapter (21a) or a USB PD adapter (310). The charging circuit (430) can supply the received direct current power to the battery (15).

[0194] The charging circuit (430) can control the charging of the battery (15). The charging circuit (430) can charge or discharge the battery (15).

[0195] The boost circuit (450) can maintain the voltage output from the battery (15) at a constant voltage. The boost circuit (450) can increase the voltage output from the battery (15) to a constant voltage. The boost circuit (450) can include a converter.

[0196] FIG. 9 is a flowchart for explaining an operating method of a display device according to another embodiment of the present disclosure, and FIG. 10 is a drawing for explaining the configuration of a head (10-2) according to another embodiment of the present disclosure.

[0197] A head (10-2) according to another embodiment of the present disclosure may include a DC adapter (21a), a first detection circuit (470-1), a main board (19), an adapter switch (800), a second detection circuit (470-2), a boost blocking circuit (1000), a boost circuit (450), a charging circuit (430), and a battery (15).

[0198] The main board (19) of the display device (1) can determine whether the DC adapter (21a) and the USB PD adapter (310) are connected (S901).

[0199] The main board (19) can determine whether the DC adapter (21a) is connected based on the output signal output by the first detection circuit (470-1). The first detection circuit (470-1) may be the detection circuit (470) described in Fig. 5.

[0200] The main board (19) can determine that the DC adapter (21a) is connected to the display device (1) when the output signal of the first detection circuit (470-1) is a high signal.

[0201] The main board (19) can determine that the DC adapter (21a) is disconnected when the output signal of the first detection circuit (4702-) is a low signal.

[0202] The main board (19) can determine whether a USB PD adapter (310) is connected based on a detection signal detected by a PD communication chip provided inside.

[0203] The main board (19) can cut off the power applied to the boost circuit (450) (S905) when it is determined that either the DC adapter (21a) or the USB PD adapter (310) is connected to the display device (1) (S903).

[0204] Conventionally, when either a DC adapter (21a) or a USB PD adapter (310) is connected to a display device (1), power is supplied to the boost circuit and a boost operation is performed. The boost operation (or pre-boost operation) may be an operation that increases the voltage output from the battery (15) to a constant voltage to ensure stable output of the battery (15).

[0205] The boost operation requires discharging of the battery (15), which may increase the recharge cycle of the battery (15). As the recharge cycle of the battery (15) increases, problems such as heat generation and reduced lifespan of the battery (15) may occur.

[0206] In order to solve the above problem, the main board (19) according to the embodiment of the present disclosure can cut off the power applied to the boost circuit (450) when it is determined that either the DC adapter (21a) or the USB PD adapter (310) is connected to the display device (1).

[0207] To cut off the power applied to the boost circuit (450), the head (10-2) or the main board (19) may be provided with a second detection circuit (470-2) and a boost cutoff circuit (1000).

[0208] This will be described later.

[0209] The main board (19) can apply power to the boost circuit (450) (S907) when it is determined that neither the DC adapter (21a) nor the USB PD adapter (310) is connected to the display device (1) (S903).

[0210] Referring to FIG. 10, a head (10-2) according to another embodiment of the present disclosure may include a DC adapter (21a), a first detection circuit (470-1), a main board (19), an adapter switch (800), a second detection circuit (470-2), a boost blocking circuit (1000), a boost circuit (450), a charging circuit (430), and a battery (15).

[0211] Hereinafter, the second detection circuit (470-2) and the boost blocking circuit (1000) are described as separate components from the main board (19), but need not be limited thereto.

[0212] The main board (19) may include one or more of a second detection circuit (470-2) or a boost blocking circuit (1000).

[0213] The DC adapter (21a) can convert AC power into DC power and transmit the converted DC power to the adapter switch (800) or the first detection circuit (470-1).

[0214] The first detection circuit (470-1) may include the above Zener diode and LDO (Low DropOut) circuit. The circuit configuration of the first detection circuit (470-2) is as described in Fig. 5.

[0215] The main board (19) can control the overall operation of the head (10-2). The main board (19) can detect whether the DC adapter (21a) is connected based on the output signal transmitted from the first detection circuit (470-1).

[0216] The main board (19) can determine that the connection of the DC adapter (21a) is maintained when the acquired output signal is a high signal.

[0217] The main board (19) can determine that the DC adapter (21a) is disconnected if the acquired output signal is a low signal.

[0218] The main board (19) can detect whether a USB PD adapter (310) is connected through the PD communication chip (19a).

[0219] The adapter switch (800) can supply DC power provided from either a DC adapter (21a) or a USB PD adapter (310) to the charging circuit (430).

[0220] The adapter switch (800) can determine the power supply path of the adapter according to the control of the main board (19).

[0221] The second detection circuit (470-2) can output a high signal or a low signal based on the voltage output from the adapter switch (800). The second detection circuit (470-2) can be placed between the output terminal of the adapter switch (800) and the input terminal of the boost blocking circuit (1000).

[0222] The second detection circuit (470-2) may have the same configuration as the detection circuit (470) illustrated in Fig. 5. The second detection circuit (470-2) may output a high signal when the output voltage according to the input voltage is 3.3 V or higher, and may output a low signal when the output voltage is less than 3.3 V.

[0223] The high signal may be a signal indicating that either the DC adapter (21a) or the USB PD adapter (310) is connected to the head (10-2).

[0224] The low signal may be a signal indicating that the DC adapter (21a) and USB PD adapter (310) are not connected to the head (10-2).

[0225] The boost cutoff circuit (1000) can cut off the power applied to the boost circuit (450) based on the signal output from the second detection signal (470-2).

[0226] The boost cutoff circuit (1000) can cut off the power applied to the boost circuit (450) through an internal switching operation when the signal output from the second detection signal (470-2) is a high signal.

[0227] The boost blocking circuit (1000) can apply power to the boost circuit (450) through an internal switching operation when the signal output from the second detection signal (470-2) is a low signal.

[0228] The boost circuit (450) can maintain the voltage output from the battery (15) at a constant voltage depending on the applied power.

[0229] The charging circuit (430) can receive direct current power from either a DC adapter (21a) or a USB PD adapter (310). The charging circuit (430) can supply the received direct current power to the battery (15).

[0230] The charging circuit (430) can control the charging of the battery (15). The charging circuit (430) can charge or discharge the battery (15).

[0231] FIG. 11 is a diagram illustrating a circuit diagram of a second detection circuit and a boost blocking circuit according to one embodiment of the present disclosure.

[0232] Referring to FIG. 11, a circuit diagram of each of the second detection circuit (470-2) and the boost blocking circuit (1000) is illustrated.

[0233] The second detection circuit (470-2) may include a Zener diode (1101) and an LDO circuit (1103). The functions of each of the Zener diode (1101) and the LDO circuit (1103) are replaced with the description of the Zener diode (510) and the LDO circuit (530) of FIG. 5.

[0234] The boost blocking circuit (1000) may include a first switching element (1001) and a second switching element (1003). The first switching element (1001) may be a FET (Field Effect Transistor), and the second switching element (1003) may be a BJT (Bipolar Junction Transistor).

[0235] When the second detection circuit (470-2) outputs a high signal, the first switching element (1001) is turned on and the second switching element (1003) is turned off, so that the power (VIN) applied to the boost circuit (450) can be cut off. When the power applied to the boost circuit (450) is cut off, the pre-boost operation of the battery (15) can be bypassed (operated in pre-boost bypass mode).

[0236] When the second detection circuit (470-2) outputs an off signal, the first switching element (1001) is turned off and the second switching element (1003) is turned on, so that power (VIN) can be applied to the boost circuit (450).

[0237] In this way, according to an embodiment of the present disclosure, when either the DC adapter (21a) or the USB PD adapter (310) is connected to the display device (1), the power applied to the boost circuit (450) can be cut off through the boost cutoff circuit (1000).

[0238] Accordingly, the power required for boost operation is no longer required, and thus the battery (15) may not be discharged. As the battery (15) is not discharged, the recharge cycle of the battery (15) is reduced, and thus the problems of overheating and reduced lifespan of the battery (15) can be solved.

[0239] FIG. 12 is a flowchart for explaining an operating method of a display device according to another embodiment of the present disclosure.

[0240] In particular, Fig. 12 may be a more specific embodiment of the embodiment of Fig. 7. Fig. 12 is described using the configuration of the head (10-1) of Fig. 8.

[0241] Referring to Fig. 12, the main board (19) of the display device (1) can obtain the output signal of the detection circuit (470) (S1201).

[0242] The main board (19) can determine whether the DC adapter (21a) is connected to the display device (1) based on the output signal of the detection circuit (470) (S1203).

[0243] The main board (19) can determine that the DC adapter (21a) is connected when the output signal of the detection circuit (470) is a high signal.

[0244] The main board (19) can determine that the DC adapter (21a) is not connected when the output signal of the detection circuit (470) is a low signal.

[0245] The main board (19) can discharge the battery (15) (S1205) when it is determined (S1203) that the DC adapter (21a) is not connected to the display device (1) based on the output signal of the detection circuit (470).

[0246] The main board (19) can control the charging circuit (430) to discharge the battery (15). The charging circuit (430) can transmit a discharge signal to the battery (15) to discharge the battery (15). The discharged power of the battery (15) can be used to drive the display (180).

[0247] When the main board (19) determines that the DC adapter (21a) is connected to the display device (1), it can determine whether the USB PD adapter (310) is connected to the display device (1) (S1207).

[0248] The main board (19) can determine whether the USB PD adapter (310) is connected to the display device (1) through the PD communication chip (19a). The PD communication chip (19a) can determine whether the USB PD adapter (310) is connected based on the resistance detected through the configuration channel (CC) pin of the USB terminal (14).

[0249] The main board (19) can charge the battery (15) using power provided through the DC adapter (21a) when the DC adapter (21a) is connected to the display device (1) and the USB PD adapter (310) is not connected to the display device (1) (S1209).

[0250] The main board (19) can display a GUI (Graphic User Interface) indicating the battery charging status on the display (180).

[0251] The main board (19) can block power transmitted from the USB PD adapter (310) when the DC adapter (21a) and the USB PD adapter (310) are connected (S1211).

[0252] The main board (19) can turn off (or deactivate) the VBUS, which is the power supply line of the USB terminal (14). Accordingly, the power supplied from the USB PD adapter (310) can be cut off.

[0253] The main board (19) can re-acquire the output signal of the detection circuit (470) (S1213) and determine whether the DC adapter (21a) is disconnected based on the re-acquired output signal (S1215).

[0254] The main board (19) can switch the power source from the DC adapter (21a) to the USB PD adapter (310) when the re-acquired output signal is a low signal (S1217).

[0255] The main board (19) can control the adapter switch (800) to switch the power source from the DC adapter (21a) to the USB PD adapter (310) when the DC adapter (21a) is disconnected.

[0256] The main board (19) can turn on (or activate) VBUS when the DC adapter (21a) is disconnected. Accordingly, power supplied through the USB PD adapter (310) can be provided to the battery (15).

[0257] The main board (19) can display a GUI (Graphic User Interface) indicating the battery charging status on the display (180).

[0258] FIG. 13 is a flowchart for explaining an operating method of a display device according to another embodiment of the present disclosure.

[0259] In particular, Fig. 13 may be a more specific embodiment of the embodiment of Fig. 9. Fig. 13 is described using the configuration of the head (10-2) of Fig. 9.

[0260] The main board (19) of the display device (1) can obtain the output signal of the second detection circuit (470-2) (S1301).

[0261] The main board (19) can determine whether the adapter is connected based on the acquired output signal (S1303).

[0262] The main board (19) can determine whether the DC adapter (21a) or the USB PD adapter (310) is connected based on the acquired output signal.

[0263] The main board (19) can apply power to the boost circuit (450) if it determines that the adapter is not connected (S1305).

[0264] The main board (19) can supply power to the boost circuit (450) when it is determined that the DC adapter (21a) and USB PD adapter (310) are not connected.

[0265] The boost blocking circuit (1000) of the main board (19) can turn off the first switching element (1001) and turn on the second switching element (1003) to block power applied to the boost circuit (450) when the output signal of the second detection circuit (470-2) is a low signal.

[0266] The main board (19) can cut off the power applied to the boost circuit (450) if it is determined that an adapter is connected (S1307).

[0267] The boost blocking circuit (1000) of the main board (19) can block power applied to the boost circuit (450) by turning on the first switching element (1001) and turning off the second switching element (1003) when the output signal of the second detection circuit (470-2) is a high signal.

[0268] The main board (19) can control the charging circuit (430) to supply power to the battery (15) via a connected adapter. The main board (19) can update a GUI (Graphic User Interface) indicating the charging status of the battery (15) and display it on the display (180).

[0269] The main board (19) can re-acquire the output signal of the second detection circuit (470-2) (S1309).

[0270] The main board (19) can determine whether the adapter is disconnected based on the re-acquired output signal (S1311).

[0271] The main board (19) can determine that the adapter is disconnected if the re-acquired output signal is a low signal.

[0272] The main board (19) can apply power to the boost circuit (450) when it determines that the adapter is disconnected.

[0273] The main board (19) can control the charging circuit (430) to discharge the battery (15) when it is determined that the adapter is disconnected. The main board (19) can update a GUI (Graphic User Interface) indicating the charging status of the battery (15) and display it on the display (180).

[0274] In this way, according to an embodiment of the present disclosure, when either a DC adapter (21a) or a USB PD adapter (310) is connected to the display (1), the power applied to the boost circuit (450) may be cut off. Accordingly, the battery (15) is not discharged, so the recharge cycle of the battery may be reduced.

[0275] FIG. 14 is a drawing illustrating an effect that occurs when a disconnection of a DC adapter is detected using a detection circuit according to an embodiment of the present disclosure.

[0276] Conventional motherboards received a detection signal indicating the disconnection of the DC adapter via the power board. In this case, even if the DC adapter was disconnected, it took 10 seconds to detect the disconnection due to the natural discharge of capacitors within the DC adapter or capacitors along the path between the DC adapter and the charging board.

[0277] The main board (19) according to the embodiment of the present disclosure took 4 seconds to detect the disconnection of the DC adapter (21a) by measuring the output voltage for the voltage of the discharged capacitor using the detection circuit (470).

[0278] That is, the time required to determine that the DC adapter is disconnected is shortened by 6 seconds compared to the conventional method by using the detection circuit (470). Accordingly, when the DC adapter (21a) and the USB PD adapter (310) are connected simultaneously and the DC adapter (21a) is disconnected, the power source can be quickly switched to the USB PD adapter (310).

[0279] That is, power can be smoothly supplied to the components of the display device (1) as the power source is quickly switched to the USB PD adapter (310).

[0280] An electronic device (1) according to an embodiment of the present disclosure may include a first detection circuit (470, 470-1) that outputs a signal indicating whether a first adapter (21a) is connected; and a main board (19) that detects, when the first adapter and the second adapter (310) are simultaneously connected, that the first adapter is disconnected based on the signal output from the first detection circuit, and switches the power source of the electronic device from the first adapter to the second adapter upon detecting that the first adapter is disconnected.

[0281] The above first detection circuit (470, 470-1) includes a Zener diode (510) having a Zener voltage and

[0282] It may include a Low DropOut (LDO) circuit (530) that outputs a preset voltage when a first voltage higher than a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage lower than the specific voltage is input.

[0283] The first detection circuit (470, 470-1) can output a high signal indicating that the first adapter is connected when a voltage of the preset voltage is output, and can output a low signal indicating that the first adapter is disconnected when a voltage lower than the preset voltage is output.

[0284] The electronic device (1) may further include a battery (15), and the main board (19) may charge the battery through the second adapter when the first adapter is disconnected.

[0285] The electronic device (1) may further include a second detection circuit (470-2) that detects whether either the first adapter or the second adapter is connected; and a boost cutoff circuit (1000) that supplies or cuts off power to a boost circuit (450) that converts a discharge voltage of a battery to a constant voltage based on an output signal of the second detection circuit.

[0286] The boost cutoff circuit (1000) can cut off power applied to the boost circuit when the second detection circuit outputs a high signal indicating that either the first adapter or the second adapter is connected, and can apply power to the boost circuit when the second detection circuit outputs a low signal indicating that the first adapter and the second adapter are not connected.

[0287] The above second detection circuit (470-2) comprises a Zener diode having a Zener voltage and

[0288] It may include a Low DropOut (LDO) circuit that outputs a preset voltage when a first voltage higher than a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage lower than the specific voltage is input.

[0289] The second detection circuit (470-2) can output a high signal indicating that the first adapter or the second adapter is connected when a voltage of the preset voltage is output, and can output a low signal indicating that the first adapter and the second adapter are not connected when a voltage lower than the preset voltage is output.

[0290] The boost blocking circuit (1000) may include the first switching element (1001) and the second switching element (1003), and when the high signal is output, the first switching element may be turned on and the second switching element may be turned off, and when the low signal is output, the first switching element may be turned off and the second switching element may be turned on.

[0291] The electronic device (1) may further include an adapter switch (800) that outputs power provided from one of the first adapter and the second adapter.

[0292] The second detection circuit (470-2) may be placed between the adapter switch and the boost blocking circuit.

[0293] The electronic device (1) may further include a battery (15), and the main board (19) may supply power provided from the first adapter to the battery when the first adapter and the second adapter are connected.

[0294] The first adapter may be a DC (Direct Current) adapter (21a), and the second adapter may be a USB (Universal Serial Bus) PD (Power Delivery) adapter (310).

[0295] The above electronic device (1) comprises a stand (20, 30, 40, 50) that receives external power by having the first adapter; and

[0296] A head (10, 10-1, 10-2) supported by the stand and having a display (180) and a battery (15), the head being electrically connected to the stand via a pogo pin; and the first detection circuit (470, 470-1) and the main board (19) can be provided in the head (10, 10-1, 10-2).

[0297] According to one embodiment of the present disclosure, the above-described method can be implemented as processor-readable code on a medium in which a program is recorded. Examples of processor-readable media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage devices.

[0298] The display device described above is not limited to the configuration and method of the embodiments described above, and the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

Claims

1. In electronic devices, A first detection circuit that outputs a signal indicating whether the first adapter is connected; and A main board that detects that the first adapter is disconnected based on the signal output from the first detection circuit while the first adapter and the second adapter are connected at the same time, and switches the power source of the electronic device from the first adapter to the second adapter upon detecting that the first adapter is disconnected. Electronic devices.

2. In paragraph 1, The above first detection circuit Zener diode having Zener voltage and A Low DropOut (LDO) circuit that outputs a preset voltage when a first voltage higher than a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage lower than the specific voltage is input. Electronic devices.

3. In paragraph 2, The above first detection circuit When the voltage of the above preset voltage is output, a high signal indicating that the first adapter is connected is output, When a voltage lower than the preset voltage is output, a low signal is output indicating that the first adapter is disconnected. Electronic devices.

4. In paragraph 1, Including more batteries, The above main board When the first adapter is disconnected, the battery is charged through the second adapter. Electronic devices.

5. In paragraph 1, A second detection circuit that detects whether either the first adapter or the second adapter is connected; and It further includes a boost cutoff circuit that supplies or cuts off power to a boost circuit that converts the discharge voltage of the battery to a constant voltage based on the output signal of the second detection circuit. Electronic devices.

6. In paragraph 5, The above boost cutoff circuit When the second detection circuit outputs a high signal indicating that either the first adapter or the second adapter is connected, the power applied to the boost circuit is cut off, When the second detection circuit outputs a low signal indicating that the first adapter and the second adapter are not connected, power is supplied to the boost circuit. Electronic devices.

7. In paragraph 6, The above second detection circuit Zener diode having Zener voltage and A Low DropOut (LDO) circuit that outputs a preset voltage when a first voltage higher than a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage lower than the specific voltage is input. Electronic devices.

8. In paragraph 7, The above second detection circuit When the voltage of the preset voltage is output, a high signal indicating that the first adapter or the second adapter is connected is output, When a voltage lower than the preset voltage is output, a low signal is output indicating that the first adapter and the second adapter are not connected. Electronic devices.

9. In paragraph 8, The above boost cutoff circuit comprising the first switching element and the second switching element, When the above high signal is output, the first switching element is turned on and the second switching element is turned off. When the above low signal is output, the first switching element is turned off and the second switching element is turned on. Electronic devices.

10. In paragraph 5, Further comprising an adapter switch for outputting power provided from one of the first adapter and the second adapter. Electronic devices.

11. In paragraph 10, The above second detection circuit located between the above adapter switch and the above boost cut-off circuit. Electronic devices.

12. In paragraph 1, Including more batteries, The above main board When the first adapter and the second adapter are connected, the power provided from the first adapter is supplied to the battery. Electronic devices.

13. In paragraph 1, The first adapter is a DC (Direct Current) adapter, and the second adapter is a USB (Universal Serial Bus) PD (Power Delivery) adapter. Electronic devices.

14. In paragraph 1, A stand having the first adapter and receiving external power; and A head supported by the stand and having a display and a battery, the head being electrically connected to the stand via pogo pins; The above first detection circuit and the main board are provided in the head. Electronic devices.

15. In the method of operating an electronic device, A step of outputting a signal indicating whether the first adapter is connected; A step of detecting that the first adapter is disconnected based on the signal output from the first detection circuit while the first adapter and the second adapter are connected simultaneously; and A step of switching the power source of the electronic device from the first adapter to the second adapter upon detecting that the first adapter is disconnected. How electronic devices work.

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