Display device and operation method thereof

Abstract

The invention provides a display device and an operation method thereof. An electronic device as a display device may include: a first detection circuit that outputs a signal indicating whether a first adapter is connected; and a main board which, in a state in which the first adapter and the second adapter are connected at the same time, detects whether or not the first adapter is disconnected on the basis of the signal output from the first detection circuit, and when it is detected that the first adapter is disconnected, switches the first adapter to the second adapter. And switching the power supply of the electronic equipment from the first adapter to the second adapter.

Description

Technical Field

[0001] The present invention relates to display devices, and more specifically, to a vertical display device. Background Technology

[0002] Vertical display devices, with their unique design and convenient functions, offer users a novel audiovisual experience.

[0003] The stand for the freestanding display unit is equipped with wheels, allowing it to be easily moved and used anywhere in the home. This enables convenient use of the display unit in various spaces such as the kitchen, living room, and bedroom.

[0004] Furthermore, vertical display devices can rotate the screen 90 degrees, allowing for use in both portrait and landscape modes. This offers advantages for viewing photos, processing documents, and using social media.

[0005] In addition, vertical display devices allow for adjustment of the screen's height and angle, enabling convenient viewing by aligning it with the user's line of sight.

[0006] Vertical display devices can receive power in various ways. For example, vertical display devices can receive power through a DC (Direct Current) adapter, a USB PD (Universal Serial Bus Power Delivery) adapter, or a battery.

[0007] The power board detects whether the DC adapter is connected and transmits the detected signal to the motherboard.

[0008] The connection status of the USB PD adapter is detected by using a PD communication chip located on the motherboard.

[0009] The battery capacity and whether the battery is charging are detected by a charging board located on the motherboard.

[0010] When both the DC adapter and the USB PD adapter are connected to the vertical display device, and the DC adapter is disconnected, the power supply is switched to the USB PD adapter to ensure smooth power delivery.

[0011] However, the natural discharge time of the capacitors inside the DC adapter or on the path from the DC adapter to the motherboard is delayed, causing a problem where switching to a USB PD adapter is slower.

[0012] Furthermore, when either the DC adapter or the USB PD adapter is connected to a vertical display device, the battery discharges due to the pre-boost operation. This results in frequent battery recharge cycles. Summary of the Invention

[0013] The purpose of this invention is to enable rapid detection of whether a DC adapter is disconnected (or disconnected) by monitoring the output voltage of the DC adapter.

[0014] The purpose of this invention is to quickly detect when a DC adapter is disconnected and switch the power supply to another adapter.

[0015] The purpose of this invention is to enable the power supply of the pre-boost integrated circuit (or boost circuit) and stop battery discharge when either the DC adapter or the USB PD adapter is connected to the display device.

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

[0017] The operation method of the electronic device according to the present invention may include: a step of outputting a signal indicating whether a first adapter is connected; a step of detecting whether the first adapter is disconnected based on the signal output from the first detection circuit when the first adapter and the second adapter are connected at the same time; and a step of switching the power supply of the electronic device from the first adapter to the second adapter as the first adapter is detected to be disconnected.

[0018] According to embodiments of the present invention, the output voltage of the DC adapter can be monitored, and it is possible to quickly determine whether the power supply to the DC adapter has been removed by using the output signal based on the monitoring results. This improves the detection time delay required to detect whether the power supply to the DC adapter is connected, which is caused by the discharge of capacitors present inside the DC adapter or capacitors along the path from the DC adapter to the charging board.

[0019] According to an embodiment of the present invention, when both the DC adapter and the USB PD adapter are connected, and the DC adapter is disconnected, the power supply can be quickly switched to the USB PD adapter, thereby ensuring that the power supply to the components of the display device is smooth.

[0020] According to an embodiment of the present invention, when either the DC adapter or the USB PD adapter is connected to the display device, the power supply applied to the boost circuit can be cut off by the boost blocking circuit.

[0021] Therefore, the power supply required for the boost operation is no longer needed, allowing the battery to remain undischarged. By preventing the battery from discharging, the number of recharge cycles can be reduced, thus resolving issues such as battery overheating and shortened lifespan. Attached Figure Description

[0022] Figure 1a and Figure 1b This is a diagram illustrating the structure of a display device according to an embodiment of the present invention.

[0023] Figure 2 The block diagram illustrates the configuration of a display device according to an embodiment of the present invention.

[0024] Figure 3 This is a diagram illustrating the configuration of a display device according to an embodiment of the present invention.

[0025] Figure 4 This is a diagram illustrating the configuration of a charging plate according to an embodiment of the present invention.

[0026] Figure 5 This is a circuit diagram illustrating a detection circuit according to an embodiment of the present invention.

[0027] Figure 6 This is a diagram illustrating the operating principle of an LDO circuit according to an embodiment of the present invention.

[0028] Figure 7 This is a flowchart illustrating the operation method of a display device according to an embodiment of the present invention.

[0029] Figure 8 This is a block diagram illustrating the configuration of the head according to another embodiment of the present invention.

[0030] Figure 9 This is a flowchart illustrating the operation method of a display device according to another embodiment of the present invention.

[0031] Figure 10 This is a diagram illustrating the configuration of the head in another embodiment of the present invention.

[0032] Figure 11 This is a circuit diagram illustrating a second detection circuit and a boost blocking circuit according to an embodiment of the present invention.

[0033] Figure 12 This is a flowchart illustrating the operation method of a display device according to another embodiment of the present invention.

[0034] Figure 13 This is a flowchart illustrating the operation method of a display device according to another embodiment of the present invention.

[0035] Figure 14 This diagram illustrates the effect of detecting the disconnection of a DC adapter using the detection circuit of an embodiment of the present invention. Detailed Implementation

[0036] Hereinafter, embodiments related to the present invention will be described in further detail with reference to the accompanying drawings. The suffixes “module” and “part” used in the following description are assigned or used interchangeably for ease of writing of the specification only, and they do not have a distinguishing meaning or function from each other.

[0037] The directional indications of up (U), down (D), left (Le), right (Ri), front (F), and back (R) shown in the accompanying drawings are for illustrative purposes only, and the technical concepts disclosed in this specification are not limited thereto.

[0038] The display device of this invention, for example, is an intelligent display device that adds computer support to the broadcast receiving function. While faithfully performing the broadcast receiving function, it also adds internet functionality, thereby providing interfaces for further ease of use, such as handwriting input devices, touchscreens, or spatial remote control. Furthermore, by supporting wired or wireless internet connectivity and connecting to the internet and computers, it can perform functions such as email, web browsing, banking, or gaming. To achieve these various functions, a standardized general-purpose operating system (OS) can be used.

[0039] Therefore, in the display device described in this invention, various applications can be freely added or removed on a general-purpose OS kernel, thereby enabling the execution of various user-friendly functions. More specifically, the display device can be, for example, a network TV, HBBTV (Hybrid Broadcast / Broadband TV), a smart TV, an LED TV (light-emitting diode TV), an OLED TV (Organic Light-Emitting Diode TV), etc., and can also be applied to smartphones as appropriate.

[0040] Figure 1a and Figure 1b This is a diagram illustrating the structure of a display device according to an embodiment of the present invention.

[0041] Reference Figure 1a and Figure 1bThe display device 1 may include a head 10. The head 10 may include a display panel for displaying images.

[0042] The head 10 may include a first long side LS1, a second long side LS2 facing 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 facing the first short side SS1.

[0043] On the other hand, for ease of explanation, the case where the lengths of the first long side LS1 and the second long side LS2 are greater than the lengths of the first short side SS1 and the second short side SS2 is shown and explained, but the lengths of the first long side LS1 and the second long side LS2 can also be approximately the same as the lengths of the first short side SS1 and the second short side SS2.

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

[0045] The direction in which the image is displayed on the head 10 can be called the front (F, z), and the opposite direction can be called the back (R). The first short side SS1 can be called the left side (Le, x). The second short side SS2 can be called the right side (Ri). The first long side LS1 can be called the top side (U, y). The second long side LS2 can be called the bottom side (D).

[0046] The first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 can be referred to as the edges of the head 10. The points where these edges intersect can be called corners. The intersection of the first short side SS1 and the first long side LS1 can be the first corner C1. The intersection of the first short side SS1 and the second long side LS2 can be the second corner C2. The intersection of the second short side SS2 and the second long side LS2 can be the third corner C3. The intersection of the second short side SS2 and the first long side LS1 can be the fourth corner C4.

[0047] The display device 1 may include supports 20, 30, 40, and 50 for supporting the head 10.

[0048] The brackets 20, 30, 40, and 50 may include a base 20, a rod 30, a rotary connector 40, and a support arm 50.

[0049] The brackets 20, 30, 40, and 50 can be detachably attached 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, which connects to the power cable CW, can be connected to a socket that supplies external power.

[0052] The power cable CW's jack CWb can be connected to the base 20.

[0053] A battery (not shown) may be built into the base 20, rod 30, support arm 50, and / or head 10, and may be charged using power supplied by the power cable CW. The display device 1 may receive power from the battery and may operate in a state detached from the power cable CW.

[0054] The rod 30 can extend vertically from the base 20. The lower end of the rod 30 can be joined adjacent to the periphery of the base 20.

[0055] The support arm 50 can extend in a direction intersecting with the rod 30 and can be attached to the upper end of the rod 30. The rotary connector 40 can be located between the head 10 and the support arm 50 and can be attached to the head 10 and the support arm 50.

[0056] The head 10 can be supported by brackets 20, 30, 40, and 50, and can be separated from the ground on the upper side.

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

[0058] The rotary connector 40 and the head 10 can have a detachable structure.

[0059] Figure 2 The block diagram illustrates the configuration of a display device according to an embodiment of the present invention.

[0060] Reference Figure 2 The display device 1 may include a broadcast receiver 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 following components—broadcast receiver 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 located on the head 10. However, this is not a limitation; some of these components may also be located on the brackets 20, 30, 40, and 50.

[0062] The broadcast receiver 130 may include a tuner 131, a demodulator 132, and a network interface 133.

[0063] Tuner 131 can select a specific broadcast channel according to channel selection instructions. Tuner 131 can receive broadcast signals corresponding to the selected specific broadcast channel.

[0064] Demodulator 132 can separate the received broadcast signal into video signal, audio signal and data signal related to the broadcast program, and can restore the separated video signal, audio signal and data signal into an output form.

[0065] The external device interface 135 can receive applications or application lists from adjacent external devices and transmit them to the controller 170 or the memory 140.

[0066] External device interface 135 can provide a connection path between display device 1 and external devices. External device interface 135 can receive at least one of video and audio output from external devices connected to display device 1 wirelessly or via wire and transmit them to 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, at least one HDMI (High Definition Multimedia Interface) terminal, and a component terminal.

[0068] Image signals from external devices input via external device interface 135 can be output via display 180. Audio signals from external devices input via external device interface 135 can be output via speaker 185.

[0069] The external device that can be connected to the external device interface 135 can be any of the following: set-top box, Blu-ray player, DVD player, game console, soundbar, smartphone, PC, USB storage device, and home theater system, but this is just an example.

[0070] The external device interface 135 may be located on at least one of the head 10 and the brackets 20, 30, 40, and 50.

[0071] Network interface 133 can provide an interface for connecting the display device 1 to wired / wireless networks, including the Internet.

[0072] Network interface 133 can send or receive data with other users or other electronic devices through a connected network or other networks linked to a connected network.

[0073] Network interface 133 can send a portion of the content data stored on display device 1 to other users or other electronic devices that are pre-registered on display device 1.

[0074] Network interface 133 can access a specified webpage through a connected network or other networks linked to the connected network. Network interface 133 can access the specified webpage through the network and send or receive data with the corresponding server.

[0075] Network interface 133 can receive content or data provided by content providers or network operators. Network interface 133 can receive content such as movies, advertisements, games, VOD, and broadcast signals, as well as related information, provided by content providers or network providers via the network.

[0076] Network interface 133 can receive firmware update information and update files provided by network operators, and can send data to the Internet, content providers, or network operators.

[0077] Network interface 133 can select and receive desired applications from publicly available (open) applications via the network.

[0078] The memory 140 can store programs for processing and controlling the signals within the controller 170, and can also store image, voice, or data signals that have been processed.

[0079] The memory 140 can also perform the function of temporarily storing image, voice or data signals input from the external device interface 135 or the network interface 133, and can also store information about a specified image through the channel memory function.

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

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

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

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

[0084] The image signal processed in the controller 170 can be input to the display 180 and displayed as an image corresponding to the image signal. The image signal processed in the controller 170 can be input to an external output device via the external device interface 135.

[0085] The voice signal processed in controller 170 can be output as audio to speaker 185. The voice signal processed in controller 170 can be input to an external output device via 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 according to user instructions or internal programs input through the user input interface 150, and can download user-expected applications or application lists to the display device 1 through a network connection.

[0088] The controller 170 can output user-selected channel information, along with the processed image or voice signal, through the display 180 or speaker 185.

[0089] The controller 170 can output image signals or audio signals from an external device, such as a camera or camcorder, input through the external device interface 135 via the display 180 or the speaker 185, based on the image playback command received through the user input interface 150.

[0090] The controller 170 can control the display 180 to display images. For example, it can control the display 180 to display broadcast images input through the tuner 131, externally input images input through the external device interface 135, images input through the network interface, or images stored in the memory 140. In this case, the image displayed on the display 180 can be a still image or a video, or it 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, or received broadcast content, or externally input content. The content can be various forms of content such as broadcast images, externally input images, audio files, still images, accessed network screens, and document files.

[0092] The wireless communication interface 173 can communicate with external devices via wired or wireless communication. The wireless communication interface 173 can perform short-range communication with external devices. For this purpose, the wireless communication interface 173 can use Bluetooth. TM It uses at least one of the following technologies to support short-range communication: 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).

[0093] The wireless communication interface 173 can support wireless communication between the display device 1 and the wireless communication system, between the display device 1 and other display devices, or between the network where the display device 1 (or an external server) resides, through near-field wireless communication networks. The near-field wireless communication network can be a near-field wireless personal area network.

[0094] The wireless communication interface 173 can detect (or identify) wearable devices that can communicate with the display device 1.

[0095] If the detected wearable device is certified as a device that communicates with the display device 1 of the present invention, the controller 170 may transmit at least a portion of the data processed in the display device 1 to the wearable device via the wireless communication interface 173. Therefore, the user of the wearable device can use the data processed in the display device 1 through the wearable device.

[0096] The display 180 can convert image signals, data signals, OSD (on-screen display) signals processed in the controller 170, or image signals and data signals received from the external device interface 135, into R, G, and B signals respectively and generate drive signals.

[0097] on the other hand, Figure 2 The display device 1 shown is only one embodiment of the present invention. Therefore, some of the constituent elements shown can be combined, added or omitted according to the design structure of the actual display device 1.

[0098] That is, it can be configured as needed to merge two or more constituent elements into one constituent element, or to subdivide one constituent element into two or more constituent elements. Furthermore, the functions executed in each module are used to illustrate embodiments of the present invention, and their specific actions or devices do not limit the scope of protection of the present invention.

[0099] According to another embodiment of the present invention, it can also be used with Figure 2 Unlike the previous version, display device 1 does not have tuner 131 and demodulator 132, but can receive and play images via network interface 133 or external device interface 135.

[0100] For example, the display device 1 can be implemented by separating an image processing device and a content playback device. The image processing device can be a set-top box or the like for receiving broadcast signals or content from various network services, and the content playback device can play content input from the image processing device.

[0101] In this case, the operation method of the display device of the present invention described below can be achieved not only by referring to... Figure 2 The operation can be performed by the display device 1 described herein, and can also be performed by any one of the separate set-top box or other image processing device and the content playback device having a display 180 and a speaker 185.

[0102] Figure 3 This is a diagram illustrating the configuration of a display device according to an embodiment of the present invention.

[0103] Reference Figure 3 The display device 1 may include a bracket 20, 30, 40, 50 and a head 10.

[0104] The brackets 20, 30, 40, and 50 may include a base 20, a rod 30, a rotary connector 40, and a support arm 50.

[0105] The brackets 20, 30, 40, and 50 can be detachably attached 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 can receive AC power from an external power source connected via the plug CWa, and can convert the received AC power into DC power. The power board 21 can supply DC power to the head 10 via at least one spring pin 41, 43 included in the rotary connector 40.

[0107] The power board 21 may include a DC adapter 21a that converts AC power to DC power. In another embodiment, the DC adapter 21a may be disposed separately from the power board 21.

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

[0109] The rotary connector 40 may include at least one spring pin 41, 43. At least one spring pin 41, 43 may be a pin that electrically connects the head 10 to the brackets 20, 30, 40, 50.

[0110] exist Figure 3 The example shown is a rotary connector 40 with two spring pins 41 and 43, but this is only an example.

[0111] At least one spring pin 41, 43 may be connected to a head connector 11, the head connector 11 including at least one contact terminal that contacts at least one spring pin 41, 43. The head connector 11 may be a spring pin socket into which the spring pins 41, 43 are inserted and form an 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 motherboard 19, and a display 180.

[0113] The head connector 11 may include at least one contact terminal for electrical contact with at least one spring pin 41, 43. The head connector 11 may supply direct current from at least one spring pin 41, 43 via at least one contact terminal to the charging board 13. The head connector 11 may be an interface for electrical connection between at least one spring pin 41, 43 and the charging board 13.

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

[0115] The charging board 13 can provide DC power from the power board 21 to at least one of the battery 15, the backlight drive circuit 17, and the motherboard 19.

[0116] Battery 15 can supply DC power to at least one of the backlight drive circuit 17 and motherboard 19.

[0117] The battery 15 can be included in the charging plate 13 or can be set separately from the charging plate 13.

[0118] With the DC adapter 21a and USB PD adapter 310 disconnected from the head 10, the battery 15 can supply DC power to the head 10 by discharging.

[0119] The backlight driving circuit 17 can be a circuit used to drive 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 can control the light output of the backlight based on a dimming value.

[0120] The motherboard 19 can control the overall movement of the head 10. The motherboard 19 may have at least one processor. Each of the at least one processor may consist of a single chip.

[0121] Display 180 can display images. If 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 also include a USB terminal 14 for connecting to a USB device.

[0123] The USB PD adapter 310 can be connected to the USB terminal 14 via a USB cable. The USB PD adapter 310 can supply DC power to the head 10 via the USB terminal 14.

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

[0125] The PD communication chip 19a located on the motherboard 19 can detect whether the USB PD adapter 310 is connected.

[0126] The specific operation of motherboard 19 will be explained later.

[0127] Figure 4 This is a diagram illustrating the configuration of a charging plate according to an embodiment of the present invention.

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

[0129] DC / DC converter 410 can convert DC power transmitted from power board 21 into constant voltage and supply the converted constant voltage to motherboard 19.

[0130] For example, the DC / DC converter 410 can step down a 20V DC voltage to 13V and supply the stepped-down 13V DC voltage to the motherboard 19.

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

[0132] The charging circuit 430 can charge the battery 15 according to the charging start signal received from the motherboard 19, and can stop charging the battery 15 according to the charging stop 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 17.5V DC voltage and output a 17.5V DC voltage.

[0135] The detection circuit 470 may include at least one Zener diode and an LDO (Low Dropout) circuit.

[0136] Figure 5 This is a circuit diagram illustrating a detection circuit according to an embodiment of the present invention.

[0137] Reference Figure 5 The detection circuit 470 may include a Zener diode 510 and an LDO circuit 530. The detection circuit 470 may also 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 can be applied to the cathode terminal of the Zener diode 510, which is then fed to the charging plate 13 via spring pins 41 and 43. One end of resistor R246 can be connected to the anode terminal of the Zener diode 510.

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

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

[0141] When a 20V output from spring pins 41 and 43 is input to the cathode terminal of Zener diode 510, 4.5V, which is the Zener voltage of 15.5V, can be applied to LDO circuit 530.

[0142] The LDO circuit 530 can be a circuit that outputs a preset voltage when the input voltage is above a certain voltage. When the input voltage is above 3.5V, the LDO circuit 530 can output 3.3V. When the input voltage is less than 3.5V, the LDO circuit 530 can reduce the output voltage according to the input voltage. When the input voltage is less than 3.5V, the LDO circuit 530 can linearly reduce the output voltage according to the input voltage.

[0143] Figure 6 This is a diagram illustrating the operating principle of an LDO circuit according to an embodiment of the present invention.

[0144] Reference Figure 6 The graph 600 shows the relationship between the input voltage and the output voltage of the LDO circuit 530.

[0145] The horizontal axis of graph 600 represents the input voltage of LDO circuit 530, and the vertical axis of graph 600 represents the output voltage of LDO circuit 530.

[0146] When the input voltage is above 3.5V, the LDO circuit 530 can output a constant voltage of 3.3V. When the input voltage is below 3.5V, the LDO circuit 530 can output an output voltage proportional to the input voltage.

[0147] When the input voltage of LDO circuit 530 is between 3.5V and 4.5V, the output voltage of LDO circuit 530 is always 3.3V. However, when the input voltage is less than 3.5V, as shown in curve 600, the output voltage can also decrease proportionally to the input voltage.

[0148] When a 20V DC voltage is applied to the detection circuit 470, a 4.5V DC voltage can be applied to the LDO circuit 530 through the Zener diode 510 with a Zener voltage of 15.5V. Since the input voltage of the LDO circuit 530 is above 3.5V, it can output 3.3V.

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

[0150] The output voltage of LDO circuit 530 can be the output voltage of detection circuit 470.

[0151] Figure 7 This is a flowchart illustrating the operation method of a display device according to an embodiment of the present invention.

[0152] Hereinafter, display device 1 may be referred to as electronic device 1.

[0153] Motherboard 19 can be referred to as main processor 19.

[0154] The fact that DC adapter 21a is connected to display device 1 or head 10 indicates that display device 1 or head 10 is receiving DC power from DC adapter 21a.

[0155] The fact that the USB PD adapter 310 is connected to the display device 1 or the head 10 indicates that the display device 1 or the head 10 is receiving DC power from the USB PD adapter 310.

[0156] Reference Figure 7 The mainboard 19 of the display device 1 can determine whether the DC adapter 21a and the USB PD adapter 310 are connected (S701).

[0157] The motherboard 19 can determine whether the DC adapter 21a is connected based on the output signal of the detection circuit 470 set on the charging board 13. When a high signal is received from the detection circuit 470, the motherboard 19 can determine that the DC adapter 21a is connected to the head 10, and when a low signal is received from the detection circuit 470, the motherboard 19 can determine that the DC adapter 21a is not connected to the head 10.

[0158] The motherboard 19 can determine whether the USB PD adapter 310 is connected based on the detection signal detected from 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.

[0159] If the resistance detected by the configuration channel pin of USB terminal 14 is a specific value or higher, the PD communication chip 19a can determine that the USB PD adapter 310 is connected.

[0160] If it is determined that both DC adapter 21a and USB PD adapter 310 are connected to display device 1 at the same time (S703), motherboard 19 can switch the power supply to DC adapter (S705).

[0161] If it is determined that DC adapter 21a and USB PD adapter 310 are connected to display device 1 at the same time, motherboard 19 can identify DC adapter 21a as a power source and supply DC power to head 10 through 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 motherboard 19 can control the adapter switch 800 (described later) to supply DC power from the DC adapter 21a to the battery 15. The adapter switch 800 can be a switching circuit that selectively connects either the DC adapter 21a or the USB PD adapter 310 to the charging circuit 430.

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

[0165] After the power is switched to DC adapter 21a, the motherboard 19 can periodically acquire the output signal of the detection circuit 470. In order to detect whether DC adapter 21a is disconnected, the motherboard 19 can acquire the output signal of the detection circuit 470.

[0166] The detection circuit 470 can acquire the output voltage of the DC adapter 21a as the 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 above 3.3V, the detection circuit 470 can output a high signal, and when the output voltage of the detection circuit 470 is less than 3.3V, the detection circuit 470 can output a low signal.

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

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

[0170] If the obtained output signal is a high signal, the motherboard 19 can determine that the DC adapter 21a remains connected.

[0171] If the received output signal is low, the motherboard 19 can determine that the DC adapter 21a has been disconnected.

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

[0173] If the motherboard 19 determines that the DC adapter 21a has been disconnected, it can switch the power supply from the DC adapter 21a to the USB PD adapter 310. Alternatively, the motherboard 19 can control the adapter switch 800 to switch the power supply to the USB PD adapter 310.

[0174] The adapter switch 800 can set the path of the DC power supplied to the charging circuit 430 to the USB PD adapter 310 according to the control of the motherboard 19.

[0175] The motherboard 19 can use the switched USB PD adapter 310 to charge the battery 15 (S713).

[0176] As described above, according to embodiments of the present invention, the output voltage of the DC adapter 21a can be monitored, and it is possible to quickly determine whether the power supply to the DC adapter 21a has been removed by using the output signal based on the monitoring results.

[0177] Therefore, it is possible to improve the detection time delay required to detect whether the power supply of the DC adapter 21a is connected due to the discharge of capacitors present inside the DC adapter 21a or capacitors in the path from the DC adapter 21a to the charging board 13.

[0178] Furthermore, according to an embodiment of the present invention, as the detection time of the DC adapter 21a is improved, the power supply can be quickly switched to the USB PD adapter 310, thereby enabling a stable power supply to the battery 15 or the display 180.

[0179] On the other hand, if only one of the DC adapter 21a and the USB PD adapter 310 is connected to the display device 1, the motherboard 19 can use the connected adapter to charge the battery 15 (S715).

[0180] When only one of the DC adapter 21a and the USB PD adapter 310 is connected to the display device 1, the motherboard 19 can control the charging circuit 430 to charge the battery 15 using the connected adapter.

[0181] When only one of the DC adapter 21a and the USB PD adapter 310 is connected to the display device 1, the motherboard 19 can shut off the power to the boost circuit 450. This will be explained later.

[0182] Figure 8 This is a block diagram illustrating the configuration of the head according to another embodiment of the present invention.

[0183] The head 10-1 of the display device 1 in another embodiment of the present invention may include a DC adapter 21a, a detection circuit 470, a motherboard 19, an adapter switch 800, a charging circuit 430, and a battery 15.

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

[0185] The detection circuit 470 may include at least one Zener diode and an LDO circuit. The circuit configuration of the detection circuit 470 is as follows: Figure 5 As shown.

[0186] When the output voltage of the LDO circuit 530 is above the constant voltage, the detection circuit 470 can output a high signal; when the output voltage of the LDO circuit 530 is below the constant voltage, the detection circuit 470 can output a low signal.

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

[0188] If the obtained output signal is a high signal, the motherboard 19 can determine that the DC adapter 21a is connected.

[0189] If the received output signal is low, the motherboard 19 can determine that the DC adapter 21a has been disconnected.

[0190] The motherboard 19 can detect whether the USB PD adapter 310 is connected via the PD communication chip 19a.

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

[0192] The adapter switch 800 can determine the power supply path of the adapter based on the control of the motherboard 19.

[0193] The charging circuit 430 can receive DC power from either the DC adapter 21a or the USB PD adapter 310. The charging circuit 430 can then supply the received DC 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 to the battery 15 to a constant voltage. The boost circuit 450 may include a converter.

[0196] Figure 9 This is a flowchart illustrating the operation method of a display device according to another embodiment of the present invention. Figure 10 This is a diagram illustrating the configuration of the head 10-2 according to another embodiment of the present invention.

[0197] In another embodiment of the present invention, the head 10-2 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 mainboard 19 of the display device 1 can determine whether the DC adapter 21a and the USB PD adapter 310 are connected (S901).

[0199] The motherboard 19 can determine whether the DC adapter 21a is connected based on the output signal of the first detection circuit 470-1. The first detection circuit 470-1 can be Figure 5 The detection circuit 470 is described in the text.

[0200] When the output signal of the first detection circuit 470-1 is a high signal, the motherboard 19 can determine that the DC adapter 21a is connected to the display device 1.

[0201] When the output signal of the first detection circuit 470-1 is low, the motherboard 19 can determine that the DC adapter 21a has been disconnected.

[0202] The motherboard 19 can determine whether the USB PD adapter 310 is connected based on the detection signal detected from the PD communication chip located inside.

[0203] If it is determined that either DC adapter 21a or USB PD adapter 310 is connected to display device 1 (S903), motherboard 19 may cut off the power applied to boost circuit 450 (S905).

[0204] In the prior art, when either the DC adapter 21a or the USB PD adapter 310 is connected to the display device 1, power is applied 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 in order to ensure a stable output from the battery 15.

[0205] The boost operation requires battery 15 to discharge, which increases the number of recharge cycles for battery 15. If the number of recharge cycles for battery 15 increases, problems such as overheating and shortened lifespan may occur.

[0206] In order to solve the problems described above, the motherboard 19 of this embodiment of the invention can cut off the power applied to the boost circuit 450 when it determines that either the DC adapter 21a or the USBPD adapter 310 is connected to the display device 1.

[0207] In order to cut off the power applied to the boost circuit 450, the head 10-2 or the main board 19 may have a second detection circuit 470-2 and a boost blocking circuit 1000.

[0208] This will be explained later.

[0209] If it is determined that neither the DC adapter 21a nor the USB PD adapter 310 is connected to the display device 1 (S903), the motherboard 19 may apply power to the boost circuit 450 (S907).

[0210] Reference Figure 10 In another embodiment of the present invention, the head 10-2 may include a DC adapter 21a, a first detection circuit 470-1, a motherboard 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 components separate from the motherboard 19, but are not limited thereto.

[0212] The motherboard 19 may include at least one of the second detection circuit 470-2 and the boost blocking circuit 1000.

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

[0214] The first detection circuit 470-1 may include at least one Zener diode and an LDO circuit. The circuit configuration of the first detection circuit 470-1 is as follows: Figure 5 As shown.

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

[0216] If the obtained output signal is a high signal, the motherboard 19 can determine that the DC adapter 21a remains connected.

[0217] If the received output signal is low, the motherboard 19 can determine that the DC adapter 21a has been disconnected.

[0218] The motherboard 19 can detect whether the USB PD adapter 310 is connected via the PD communication chip 19a.

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

[0220] The adapter switch 800 can determine the power supply path of the adapter based on the control of the motherboard 19.

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

[0222] The second detection circuit 470-2 can be connected with Figure 5 The detection circuit 470 shown in the figure has the same configuration. When the output voltage based on the input voltage is 3.3V or higher, the second detection circuit 470-2 can output a high signal, and when the output voltage based on the input voltage is less than 3.3V, the second detection circuit 470-2 can output a low signal.

[0223] A high signal can be a signal indicating that either DC adapter 21a or USB PD adapter 310 is connected to head 10-2.

[0224] A low signal can indicate that the DC adapter 21a and the USB PD adapter 310 are not connected to the head 10-2.

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

[0226] When the signal output from the second detection circuit 470-2 is a high signal, the boost blocking circuit 1000 can cut off the power supply applied to the boost circuit 450 through an internal switching action.

[0227] When the signal output from the second detection circuit 470-2 is a low signal, the boost blocking circuit 1000 can apply power to the boost circuit 450 through an internal switching action.

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

[0229] The charging circuit 430 can receive DC power from either the DC adapter 21a or the USB PD adapter 310. The charging circuit 430 can then supply the received DC 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] Figure 11 This is a circuit diagram illustrating a second detection circuit and a boost blocking circuit according to an embodiment of the present invention.

[0232] Reference Figure 11 The circuit diagrams of the second detection circuit 470-2 and the boost blocking circuit 1000 are shown.

[0233] The second detection circuit 470-2 may include a Zener diode 1101 and an LDO circuit 1103. The functions of the Zener diode 1101 and the LDO circuit 1103 are described below. Figure 5 The Zener diode 510 and LDO circuit 530 are used as alternatives.

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

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

[0236] When the second detection circuit 470-2 outputs a low signal, the first switching device 1001 is turned off and the second switching device 1003 is turned on, thereby allowing power supply VIN to be applied to the boost circuit 450.

[0237] As described above, according to an embodiment of the present invention, 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 by the boost blocking circuit 1000.

[0238] Therefore, the power supply required for the boost operation is no longer needed, and battery 15 can remain undischarged. With battery 15 not discharging, the number of recharge cycles is reduced, thus resolving the issues of overheating and shortened lifespan of battery 15.

[0239] Figure 12 This is a flowchart illustrating the operation method of a display device according to another embodiment of the present invention.

[0240] especially, Figure 12 It can be Figure 7 More specific embodiments are described below. Figure 12 In China, use Figure 8 The composition of the head 10-1 is explained.

[0241] Reference Figure 12 The main board 19 of the display device 1 can acquire the output signal of the detection circuit 470 (S1201).

[0242] The motherboard 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] When the output signal of the detection circuit 470 is a high signal, the motherboard 19 can determine that the DC adapter 21a is connected.

[0244] If the output signal of the detection circuit 470 is low, the motherboard 19 can determine that the DC adapter 21a is not connected.

[0245] If the DC adapter 21a is determined to be not connected to the display device 1 based on the output signal of the detection circuit 470 (S1203), the motherboard 19 can discharge the battery 15 (S1205).

[0246] The motherboard 19 can control the charging circuit 430 to discharge the battery 15. The charging circuit 430 can discharge the battery 15 by transmitting a discharge signal to the battery 15. The discharged power from the battery 15 can be used to drive the display 180.

[0247] If the DC adapter 21a is determined to be connected to the display device 1, the motherboard 19 can determine whether the USB PD adapter 310 is connected to the display device 1 (S1207).

[0248] The motherboard 19 can determine whether the USB PD adapter 310 is connected to the display device 1 via 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 by the configuration channel (CC) pin of the USB terminal 14.

[0249] 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, the motherboard 19 can use the power supplied by the DC adapter 21a to charge the battery 15 (S1209).

[0250] The motherboard 19 can display a GUI (Graphical User Interface) indicating the battery's charging status on the monitor 180.

[0251] With both DC adapter 21a and USB PD adapter 310 connected, motherboard 19 can cut off the power supplied from USB PD adapter 310 (S1211).

[0252] The motherboard 19 can disconnect (or deactivate) the VBUS power supply line for the USB terminal 14. This cuts off the power supply from the USB PD adapter 310.

[0253] The motherboard 19 can reacquire the output signal of the detection circuit 470 (S1213), and can determine whether the DC adapter 21a is disconnected based on the reacquired output signal (S1215).

[0254] If the reacquired output signal is a low signal, the motherboard 19 can switch the power supply from the DC adapter 21a to the USB PD adapter 310 (S1217).

[0255] When the DC adapter 21a is disconnected, the motherboard 19 can control the adapter switch 800 to switch the power supply from the DC adapter 21a to the USB PD adapter 310.

[0256] With DC adapter 21a disconnected, motherboard 19 can connect (or activate) VBUS. Power supplied via USB PD adapter 310 can then be provided to battery 15.

[0257] The motherboard 19 can display a GUI indicating the battery's charging status on the monitor 180.

[0258] Figure 13 This is a flowchart illustrating the operation method of a display device according to another embodiment of the present invention.

[0259] especially, Figure 13 It can be Figure 9 More specific embodiments are described below. Figure 13 In China, use Figure 9 The composition of the head 10-2 is explained.

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

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

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

[0263] If the adapter is determined to be disconnected, the motherboard 19 can apply power to the boost circuit 450 (S1305).

[0264] If the DC adapter 21a and USB PD adapter 310 are determined to be unconnected, the motherboard 19 can apply power to the boost circuit 450.

[0265] When the output signal of the second detection circuit 470-2 is a low signal, the boost blocking circuit 1000 of the motherboard 19 can cut off the power applied to the boost circuit 450 by turning off the first switching device 1001 and turning on the second switching device 1003.

[0266] If the connection is determined to be an adapter, the motherboard 19 can cut off the power applied to the boost circuit 450 (S1307).

[0267] When the output signal of the second detection circuit 470-2 is a high signal, the boost blocking circuit 1000 of the motherboard 19 can cut off the power applied to the boost circuit 450 by turning on the first switching device 1001 and turning off the second switching device 1003.

[0268] The motherboard 19 can control the charging circuit 430 to supply power to the battery 15 through the connected adapter. The motherboard 19 can update the GUI indicating the charging status of the battery 15 and display it on the display 180.

[0269] The motherboard 19 can reacquire the output signal (S1309) of the second detection circuit 470-2.

[0270] The motherboard 19 can determine whether the adapter has been disconnected based on the reacquired output signal (S1311).

[0271] If the reacquired output signal is a low signal, the motherboard 19 can determine that the adapter has been disconnected.

[0272] If the adapter is determined to be disconnected, the motherboard 19 can apply power to the boost circuit 450.

[0273] If the adapter is determined to be disconnected, the motherboard 19 can control the charging circuit 430 to discharge the battery 15. The motherboard 19 can update the GUI indicating the charging status of the battery 15 and display it on the display 180.

[0274] As described above, according to an embodiment of the present invention, 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. Therefore, the battery 15 will not discharge, thereby reducing the number of battery recharge cycles.

[0275] Figure 14 This diagram illustrates the effect of detecting the disconnection of a DC adapter using the detection circuit of an embodiment of the present invention.

[0276] Existing motherboards receive the detection signal indicating that the DC adapter has been disconnected via the power board. In this case, even if the DC adapter is disconnected, it still takes 10 seconds to detect the disconnection due to the natural discharge of capacitors inside the DC adapter or capacitors on the path between the DC adapter and the charging board.

[0277] In this embodiment of the invention, the motherboard 19 uses a detection circuit 470 to measure the output voltage relative to the voltage of the discharge capacitor, thereby detecting that it takes 4 seconds for the DC adapter 21a to be disconnected.

[0278] That is, the time required to determine whether the DC adapter is disconnected using the detection circuit 470 is reduced by 6 seconds compared to the prior art. Therefore, when both the DC adapter 21a and the USB PD adapter 310 are connected, the power can be quickly switched to the USB PD adapter 310 when the DC adapter 21a is disconnected.

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

[0280] The electronic device 1 of this invention may include: a first detection circuit 470, 470-1, which outputs a signal indicating whether the first adapter 21a is connected; and a motherboard 19, which, when the first adapter and the second adapter 310 are connected at the same time, detects whether the first adapter is disconnected based on the signal output from the first detection circuit, and switches the power supply of the electronic device from the first adapter to the second adapter as soon as the first adapter is detected to be disconnected.

[0281] The first detection circuits 470 and 470-1 may include: a Zener diode 510 having a Zener voltage; and an LDO circuit 530 that outputs a preset voltage when a first voltage above a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage below the specific voltage is input.

[0282] When the output voltage is the preset voltage, the first detection circuits 470 and 470-1 can output a high signal indicating that the first adapter is connected, and when the output voltage is less than the preset voltage, they can output a low signal indicating that the first adapter is disconnected.

[0283] The electronic device 1 may also include a battery 15, and the motherboard 19 may charge the battery via the second adapter when the first adapter is disconnected.

[0284] The electronic device 1 may further include: a second detection circuit 470-2 for detecting whether either the first adapter or the second adapter is connected; and a boost blocking circuit 1000 for applying or cutting off power to the boost circuit 450 that converts the battery's discharge voltage into a constant voltage based on the output signal of the second detection circuit.

[0285] When the second detection circuit outputs a high signal indicating that either the first adapter or the second adapter is connected, the boost blocking circuit 1000 can cut off the power supply applied to the boost circuit; when the second detection circuit outputs a low signal indicating that neither the first adapter nor the second adapter is connected, the boost blocking circuit 1000 can apply power to the boost circuit.

[0286] The second detection circuit 470-2 may include: a Zener diode having a Zener voltage; and an LDO circuit that outputs a preset voltage when a first voltage above a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage less than the specific voltage is input.

[0287] When the output voltage is the preset voltage, the second detection circuit 470-2 can output a high signal indicating that the first adapter or the second adapter is connected; when the output voltage is less than the preset voltage, the second detection circuit 470-2 can output a low signal indicating that the first adapter and the second adapter are not connected.

[0288] The boost blocking circuit 1000 may include the first switching device 1001 and the second switching device 1003. When the high signal is output, the first switching device can be turned on and the second switching device can be turned off. When the low signal is output, the first switching device can be turned off and the second switching device can be turned on.

[0289] The electronic device 1 may further include an adapter switch 800, which outputs power supplied from either the first adapter or the second adapter.

[0290] The second detection circuit 470-2 can be configured between the adapter switch and the boost blocking circuit.

[0291] The electronic device 1 may also include a battery 15, and when the first adapter and the second adapter are connected, the motherboard 19 may supply power from the first adapter to the battery.

[0292] 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.

[0293] The electronic device 1 may include: brackets 20, 30, 40, and 50, having the first adapter and receiving an external power source; and heads 10, 10-1, and 10-2, supported by the brackets, and having a display 180 and a battery 15; the heads are electrically fastened to the brackets by spring pins, and the first detection circuits 470 and 470-1 and the mainboard 19 may be disposed on the heads 10, 10-1, and 10-2.

[0294] According to an embodiment of the present invention, the above-described method can be implemented using processor-readable code stored in a medium containing a program. Examples of processor-readable media include ROM, RAM, CD-ROM, magnetic disk, floppy disk, and optical data storage devices.

[0295] The application of the display device described above is not limited to the configuration and method of the embodiments described above. It can also be selectively combined and constitute all or part of each embodiment to achieve various modifications of the embodiments.

Claims

1. An electronic device, wherein, include: The first detection circuit outputs a signal indicating whether the first adapter is connected. as well as When the first adapter and the second adapter are connected at the same time, the motherboard detects whether the first adapter is disconnected based on the signal output from the first detection circuit. As soon as the first adapter is detected to be disconnected, the power supply of the electronic device is switched from the first adapter to the second adapter.

2. The electronic device according to claim 1, wherein, The first detection circuit includes: Zener diode, having Zener voltage; and The low-dropout circuit outputs a preset voltage when a first voltage above a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage below the specific voltage is input. The first voltage and the second voltage are the voltages output from the Zener diode, respectively.

3. The electronic device according to claim 2, wherein, When the preset voltage is output, the first detection circuit outputs a high signal indicating that the first adapter is connected; When the output voltage is less than the preset voltage, the first detection circuit outputs a low signal indicating that the first adapter is disconnected.

4. The electronic device according to claim 1, wherein, It also includes batteries; When the first adapter is disconnected, the motherboard charges the battery through the second adapter.

5. The electronic device according to claim 1, wherein, Also includes: The second detection circuit detects whether either the first adapter or the second adapter is connected. as well as The boost blocking circuit applies power to or cuts off the power supply to the boost circuit that converts the battery's discharge voltage into a constant voltage, based on the output signal of the second detection circuit.

6. The electronic device according to claim 5, wherein, When the second detection circuit outputs a high signal indicating that either the first adapter or the second adapter is connected, the boost blocking circuit cuts off the power supply applied to the boost circuit. When the second detection circuit outputs a low signal indicating that neither the first adapter nor the second adapter is connected, the boost blocking circuit applies power to the boost circuit.

7. The electronic device according to claim 6, wherein, The second detection circuit includes: Zener diode, having Zener voltage; and The low-dropout circuit outputs a preset voltage when a first voltage above a specific voltage is input, and outputs a voltage proportional to the second voltage when a second voltage below the specific voltage is input. The first voltage and the second voltage are the voltages output from the Zener diode, respectively.

8. The electronic device according to claim 7, wherein, When the preset voltage is output, the second detection circuit outputs a high signal indicating that the first adapter or the second adapter is connected; When the output voltage is less than the preset voltage, the second detection circuit outputs a low signal indicating that neither the first adapter nor the second adapter is connected.

9. The electronic device according to claim 8, wherein, The boost blocking circuit includes the first switching device and the second switching device; When the high signal is output, the first switching device is turned on and the second switching device is turned off; When the low signal is output, the first switching device is turned off and the second switching device is turned on.

10. The electronic device according to claim 5, wherein, It also includes the adapter switch; The adapter switch outputs power supplied from either the first adapter or the second adapter.

11. The electronic device according to claim 10, wherein, The second detection circuit is configured between the adapter switch and the boost blocking circuit.

12. The electronic device according to claim 1, wherein, It also includes batteries; With both the first adapter and the second adapter connected, the motherboard will supply power from the first adapter to the battery.

13. The electronic device according to claim 1, wherein, The first adapter is a DC adapter, and the second adapter is a Universal Serial Bus Power Transport Adapter.

14. The electronic device according to claim 1, wherein, include: A bracket having the first adapter and receiving an external power source; as well as The head, supported by the bracket, has a display and a battery; The head is electrically fastened to the bracket by a spring pin; The first detection circuit and the motherboard are located in the head.

15. A method for operating an electronic device, wherein, include: The steps to output a signal indicating whether the first adapter is connected; The step of detecting whether the first adapter has been disconnected based on the signal output from the first detection circuit when the first adapter and the second adapter are connected at the same time; as well as Upon detecting that the first adapter has been disconnected, the step of switching the power supply of the electronic device from the first adapter to the second adapter.

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