Display device with multi-power supply function and operation method thereof

Abstract

A display device with multiple power supply functions and an operation method thereof. The display device includes an internal power supply, a first interface, a second interface, a first power supply controller, a second power supply controller, and a control circuit; the first power supply controller is electrically connected to the first interface; the first power supply controller is configured to determine whether the first interface has a power supply capability; the second power supply controller is configured to determine whether the second interface has a first power supply requirement; the control circuit is electrically connected to the first power supply controller and the second power supply controller; the control circuit is configured to selectively supply power from the internal power supply and / or the first interface according to the first determination result of the first power supply controller, the second determination result of the second power supply controller, the power supply capability, and the first power supply requirement. The present application can effectively improve the total power supply of the display device, so that the display device can realize multiple power supply functions, and also realize the goals of resource conservation, efficient utilization, and carbon footprint reduction.

Description

Technical Field

[0001] This invention relates to a display, and more particularly to a display device with multiple power supply (Multi-PD) functionality and its operation method. Background Technology

[0002] With the development of technologies such as Universal Serial Bus (USB) Type-C, Thunderbolt (TBT), and Power Delivery (PD), most current laptops, mobile phones, and other mobile devices use USB Type-C interfaces, which serve as both signal transmission interfaces and power supply ports. For display devices, current designs incorporate Power Delivery (PD) functionality into the TBT or USB Type-C input interfaces.

[0003] Ideally, display devices should have Multi-PD functionality to simultaneously power multiple external devices. However, in practice, this is limited by factors such as excessive power consumption, display balancing, peripheral interface power supply, efficiency under various loads, and the bottleneck of high-power output from the power board. Even if the display device's power board is designed for dynamic power allocation, after prioritizing power distribution to the internal system, the remaining power is insufficient to fully meet the power demands of external devices. This significantly reduces the power-consuming capabilities of external devices and may even affect the operation of certain functions.

[0004] Furthermore, electronic waste is a global issue, including a large number of idle or discarded power adapters. Therefore, how to effectively reuse these idle power adapters to reduce the generation of electronic waste and at the same time reduce the resource consumption and carbon footprint caused by manufacturing new power adapters to help achieve environmental sustainability is also an urgent and important issue.

[0005] Therefore, there is a need to provide a display device with multiple power supply functions and its operation method to solve the above problems. Summary of the Invention

[0006] In view of this, the present invention proposes a display device with multiple power supply functions and its operation method to effectively solve the above-mentioned problems encountered by the prior art.

[0007] According to a specific embodiment of the present invention, a display device with multiple power supply functions is provided. In this embodiment, the display device includes an internal power supply, a first interface, a second interface, a first power supply controller, a second power supply controller, and a control circuit. The first power supply controller is electrically connected to the first interface. The first power supply controller is configured to determine whether the first interface has power supply capability. The second power supply controller is electrically connected to the second interface. The second power supply controller is configured to determine whether the second interface has a first power supply requirement. The control circuit is electrically connected to the first power supply controller and the second power supply controller. The control circuit is configured to selectively determine whether power is supplied by the internal power supply and / or the first interface based on the first determination result of the first power supply controller, the second determination result of the second power supply controller, the power supply capability, and the first power supply requirement.

[0008] According to a specific embodiment of the present invention, a method for operating a display device is provided. In this embodiment, the method includes: determining whether a first interface of the display device has power supply capability to generate a first determination result; determining whether a second interface has a first power supply requirement to generate a second determination result; and selectively determining, based on the first determination result, the second determination result, the power supply capability, and the first power supply requirement, whether power is supplied by the internal power supply of the display device and / or the first interface.

[0009] Compared to prior art, the display device and its operation method with multi-power supply (Multi-PD) function proposed in this invention reuse the power supply capacity of idle power adapters through the design of power supply controller and power management circuit, effectively increasing the total power supply of the display device. This enables the display device to simultaneously power one or more external devices to achieve multi-power supply function. It can also significantly reduce the generation of electronic waste and reduce the large amount of materials and energy consumed in manufacturing new power adapters, as well as the emission of greenhouse gases such as carbon dioxide. This achieves the goals of resource conservation, efficient utilization, and carbon footprint reduction, and helps enterprises practice the ESG concepts of environmental protection, social responsibility, and governance based on innovative technologies.

[0010] To further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0011] Figure 1 A schematic diagram illustrating a display device with multiple power supply functions in one embodiment of the present invention is shown, in which different electronic devices are connected to each other through multiple interfaces.

[0012] Figure 2 and Figure 3The diagrams illustrate how the display device of the present invention, which has multiple power supply functions, determines different power supply paths based on the power supply capacity of the external power adapter.

[0013] Figure 4 The diagram illustrates how the multi-channel power path switching circuit of the present invention supplies power to the USB module by the internal power supply when the display device does not receive power from the power adapter.

[0014] Figure 5 The diagram illustrates how the multi-channel power path switching circuit of the present invention switches to power supply from the power adapter to the USB module when the display device receives power from the power adapter.

[0015] Figures 6 to 9 The diagrams illustrate different power supply paths of the second power management circuit of the present invention in the following states: boost state with left input and right output, buck state with left input and right output, boost state with right input and left output, and buck state with right input and left output.

[0016] Figures 10A to 10E A flowchart illustrating the operation method of a display device with multiple power supply functions according to an embodiment of the present invention is shown.

[0017] Explanation of key component symbols:

[0018] DIS display device

[0019] ADP power adapter / external power supply device

[0020] DE1 First Device

[0021] DE2 Second Device

[0022] DE3 Third Device

[0023] DE4 Fourth Device

[0024] DE5 Fifth Device

[0025] TBT_IN Thunderbolt Input Interface / Second Interface

[0026] TBT_OUT Thunderbolt Output Interface / Third Interface

[0027] Type-C UFP USB Type-C upstream port interface

[0028] Type-C DFP USB Type-C downstream port interface

[0029] USB-A1 USB Type-A interface

[0030] USB-A2 USB Type-A interface

[0031] PW power supply

[0032] PSC multi-channel power path switching circuit

[0033] UM USB module

[0034] MCU control circuit

[0035] Type-C_IN First Interface

[0036] PD1 First Power Supply Controller

[0037] PD2 Second Power Supply Controller

[0038] CC power supply information

[0039] PMIC1 First Power Management Circuit

[0040] PMIC2 Second Power Management Circuit

[0041] MOS (Metal-Oxide-Semiconductor Field-Effect Transistor)

[0042] SW1 First Switch

[0043] SW2 Second Switch

[0044] SW3 Third Switch

[0045] SW4 Fourth Switch

[0046] SW5 Fifth Switch

[0047] SW6 Sixth Switch

[0048] SW7 Seventh Switch

[0049] SW8 Eighth Switch

[0050] PTH1 First Power Supply Path

[0051] PTH2 Second Power Supply Path

[0052] PTH3 Third Power Supply Path

[0053] PTH4 Fourth Power Supply Path

[0054] PWR_IN Internal power input terminal

[0055] USBPWR_IN USB module power input terminal

[0056] GND ground terminal

[0057] D1 diode

[0058] D2 Schottky diode

[0059] Capacitors C1 to C3

[0060] Q1~Q3 P-type high-power MOSFETs

[0061] resistors R1 to R6

[0062] M1~M4 N-type MOSFETs

[0063] L Inductance

[0064] N1 First Node

[0065] N2 Second Node

[0066] HG1 gate control signal

[0067] HG2 gate control signal

[0068] LG1 gate control signal

[0069] LG2 gate control signal

[0070] 1 First power path

[0071] 2 Second power path

[0072] Steps S1 to S7

[0073] Steps S40 to S57

[0074] Steps S60 to S68

[0075] Steps S70 to S74 Detailed Implementation

[0076] The following specific embodiments, in conjunction with Figures 1 to 10E The embodiments disclosed in this specification are provided to illustrate the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed herein. However, the following disclosure is not intended to limit the scope of protection of the present invention.

[0077] The structures shown in the accompanying drawings of this invention are not drawn to scale according to the actual shape and size of the implementation. For example, the dimensions of certain components have been enlarged for ease of explanation.

[0078] Furthermore, it should be understood that when a component is referred to as being “connected to” another component, it may be directly coupled to or indirectly coupled to the other component, or there may be an intermediate component. As used herein, “electrical connection” may refer to physical and / or non-physical electrical connections, or it may be a wired and / or wireless electrical connection.

[0079] It should be understood that although the terms “first,” “second,” “third,” etc., may be used in this document to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, the “first element” discussed below may be referred to as the second element without departing from the teachings of this document.

[0080] According to a specific embodiment of the present invention, a display device with multiple power supply functions is provided. In this embodiment, the display device with multiple power supply functions includes multiple interfaces for electrically connecting to different types of electronic devices, such as laptop computers, mobile phones, tablet computers, speakers, desk lamps, and power adapters.

[0081] Please refer to Figure 1 , Figure 1 This illustration shows a display device with multiple power supply functions in this embodiment, which connects to different electronic devices through its multiple interfaces. For example... Figure 1 As shown, the multiple interfaces of the display device DIS may include a video input interface, a video output interface, and a USB data transmission interface, such as the first interface Type-C UFP, the second interface TBT_IN, the third interface TBT_OUT, the fourth interface Type-C DFP, the fifth interface USB-A1, and the sixth interface USB-B, which are respectively set on the outer frame of the display device DIS.

[0082] For example, the first interface, Type-C UFP, can be electrically connected to an external power supply device (such as a power adapter) ADP with power delivery (PD) capability, while the second interface, TBT_IN, the third interface, TBT_OUT, the fourth interface, Type-C DFP, the fifth interface, USB-A1, and the sixth interface, USB-A2, can be electrically connected to devices DE1 through DE5 that require power supply, respectively, but are not limited thereto. The second interface, TBT_IN, and the third interface, TBT_OUT, are TBT interfaces, which employ a high-speed data transmission and connection technology that can dynamically adjust the bandwidth of data and video according to the device and application.

[0083] In practical applications, the first interface Type-C UFP, the second interface TBT_IN, the third interface TBT_OUT, the fourth interface Type-C DFP, the fifth interface USB-A1, and the sixth interface USB-A2 of the display device DIS can be, respectively, a Universal Serial Bus (USB) Type-C Upstream Facing Port (UFP) interface, a Thunderbolt (TBT) input interface, a Thunderbolt (TBT) output interface, a USB Type-C Downstream Facing Port (DFP) interface, a USB Type-A interface, etc., but are not limited thereto.

[0084] It should be noted that although the present invention is described with the display device DIS designed to be electrically connected to an external power supply device (e.g., a power adapter) ADP with power supply capability via a first interface Type-C UFP as the main embodiment, the present invention can also be designed to electrically connect the display device DIS to an external power supply device (e.g., a power adapter) ADP with power supply capability via other types of interfaces (e.g., HDMI / DP / TBT_IN video input interfaces, DP_OUT / TBT_OUT video output interfaces, USB data transmission uplink ports, etc.), depending on the actual needs.

[0085] Please refer to Figure 2 and Figure 3 , Figure 2 and Figure 3 The diagrams illustrate how a display device with multiple power supply functions, according to an embodiment of the present invention, determines different power supply paths based on the power supply capacity of an external power adapter. For example... Figure 2 and Figure 3 As shown, the display device DIS includes a control circuit MCU, a first power supply controller PD1, a second power supply controller PD2, a first power management circuit PMIC1, a second power management circuit PMIC2, an internal power supply PW, a multi-channel power path switching circuit PSC, a USB module UM, a metal oxide semiconductor field-effect transistor MOS, a first interface Type-C_IN, a second interface TBT_IN, a third interface TBT_OUT, a first switch SW1, a second switch SW2, a third switch SW3, a fourth switch SW4, a fifth switch SW5, a sixth switch SW6, a seventh switch SW7, and an eighth switch SW8.

[0086] The control circuit MCU is electrically connected to the first power supply controller PD1, the second power supply controller PD2, and the first switch SW1 to the eighth switch SW8, respectively. The first power supply controller PD1 is electrically connected to the first interface Type-C_IN. The second power supply controller PD2 is electrically connected to the second interface TBT_IN and the third interface TBT_OUT, respectively. In practice, the control circuit MCU can be a microcontroller unit (MCU) or a general-purpose input / output (GPIO) to control the first switch SW1 to the eighth switch SW8 to turn on or off, but is not limited to these.

[0087] The first power supply controller PD1 is configured to determine whether the first interface Type-C_IN has power supply capability. For example, the first power supply controller PD1 can electrically connect to an external power supply device with power supply capability (e.g., depending on whether the first interface Type-C_IN is electrically connected) based on whether the first interface Type-C_IN is electrically connected. Figure 1 The power adapter (ADP) in the first interface (Type-C_IN) is used to determine whether it has power supply capability, but this is not a limitation. The second power supply controller (PD2) is configured to determine whether the second interface (TBT_IN) has a first power supply requirement and whether the third interface (TBT_OUT) has a second power supply requirement. For example, the second power supply controller (PD2) can determine whether the second interface (TBT_IN) is electrically connected to a first powered device (e.g., a device with a first power supply requirement) based on whether the second interface (TBT_IN) has a first power supply requirement. Figure 1 Whether the first device DE1 and the third interface TBT_OUT are electrically connected to a second powered device (e.g., a device with a second power supply requirement) that has a second power supply requirement. Figure 1 The second device (DE2) in the circuit determines whether the second interface TBT_IN has a first power supply requirement and whether the third interface TBT_OUT has a second power supply requirement, but is not limited thereto. The control circuit MCU is configured to receive the first judgment result of the first power supply controller PD1 and the second judgment result of the second power supply controller PD2 respectively, and selectively decides to supply power by the internal power supply PW and / or the first interface Type-C_IN according to the first judgment result of the first power supply controller PD1, the second judgment result of the second power supply controller PD2, the power supply capacity, and the first power supply requirement, and accordingly turns on or off the first switch SW1 to the eighth switch SW8.

[0088] The first switch SW1 is electrically connected between the first interface Type-C_IN and the first power management circuit PMIC1. The second switch SW2 is electrically connected between the internal power supply PW and the first power management circuit PMIC1. The third switch SW3 is electrically connected between the first interface Type-C_IN and the multi-channel power path switching circuit PSC. The fourth switch SW4 is electrically connected between the first interface Type-C_IN and the third interface TBT_OUT. The fifth switch SW5 is electrically connected to both the third interface TBT_OUT and the second power management circuit PMIC2. The sixth switch SW6 is electrically connected to both the first interface Type-C_IN and the second power management circuit PMIC2. The seventh switch SW7 is electrically connected between the internal power supply PW and the second power management circuit PMIC2. The eighth switch SW8 is electrically connected between the internal power supply PW and the second power management circuit PMIC2.

[0089] The first power management circuit PMIC1 is electrically connected to the first switch SW1, the second switch SW2, and the metal-oxide-semiconductor field-effect transistor (MOSFET). The MOSFET is electrically connected to the second interface TBT_IN. The second power management circuit PMIC2 is electrically connected to the fifth switch SW5, the sixth switch SW6, the seventh switch SW7, and the eighth switch SW8.

[0090] It should be noted that the first power management circuit PMIC1 and the second power management circuit PMIC2 can be power management chips that realize bidirectional power transmission and management. When the first switch SW1 is turned on, the first power management circuit PMIC1 receives power from the first interface Type-C_IN, which has power supply capability. For example, this power supply can come from an external power supply device electrically connected to the first interface Type-C_IN (e.g., Figure 1 The power adapter (ADP) is used, but not limited to this. When the second switch SW2 is turned on, the first power management circuit PMIC1 receives power from the internal power supply PW. When the second interface TBT_IN has a first power demand, the first power management circuit PMIC1 supplies power to the second interface TBT_IN through the metal-oxide-semiconductor field-effect transistor MOS, so as to supply power to the first powered device (e.g., the first powered device) electrically connected to it through the second interface TBT_IN. Figure 1 The first device (DE1) is used, but not limited to this. When the seventh switch SW7 or the eighth switch SW8 is turned on, the second power management circuit PMIC2 receives power from the internal power supply PW. When the fifth switch SW5 or the sixth switch SW6 is turned on, the second power management circuit PMIC2 supplies power to the first interface Type-C_IN or the third interface TBT_OUT through the fifth switch SW5 or the sixth switch SW6.

[0091] In practical applications, the second interface TBT_IN and the third interface TBT_OUT can share a 2-port PD controller (e.g., RTS5458H). An additional set of slave integrated bus circuits (I2C) has been reserved to communicate with the first power supply controller PD1, which is electrically connected to the first interface Type-C_IN, to realize the power supply pass-through function.

[0092] The multi-channel power path switching circuit (PSC) is electrically connected between the internal power supply (PW) and the USB module (UM). The PSC is configured to selectively supply power to the USB module (UM) directly from the internal power supply (PW) or switch to supplying power to the USB module (UM) via the first interface (Type-C_IN). When the third switch (SW3) is off, the PSC switches to supply power to the USB module (UM) directly from the internal power supply (PW). When the third switch (SW3) is on, the PSC switches to supply power to the USB module (UM) via the first interface (Type-C_IN) and simultaneously cuts off the power supply to the internal power supply (PW).

[0093] It should be noted that, since traditional display device interface designs typically only have the second interface TBT_IN with power supply capability, the display device DIS of the present invention is additionally equipped with a first power supply controller PD1, a second power supply controller PD2, a first power management circuit PMIC1, and a second power management circuit PMIC2 in order to realize multiple power supply functions.

[0094] In practical applications, the first power supply controller PD1 can be used to obtain power from an external power supply device electrically connected to the first interface Type-C_IN (e.g., Figure 1 The second power controller PD2 can obtain power supply information such as the power supply capability of the power adapter (ADP) in the second interface (TBT_IN), and can also obtain the power supply information of the first powered device (e.g., the first powered device connected to the second interface TBT_IN). Figure 1 The first power supply requirement of the first device DE1) and the second powered device (e.g., the third interface TBT_OUT) electrically connected to it are related to the first power supply requirement of the first device DE1. Figure 1 The second power supply controller (DE2) receives power supply information such as its second power supply requirement (cc) as a basis for subsequent determination of whether to be powered by the first interface (Type-C_IN). The first power supply controller (PD1) and the second power supply controller (PD2) are mainly used to manage the USB PD protocol, and their functions may include the following:

[0095] (1) Power negotiation: The first power controller PD1 and the second power controller PD2 can be used to manage the power negotiation between the master device (e.g., display device DIS) and the slave device (e.g., the first device DE1). They can determine the voltage and current required by the device through the USB PD protocol, thereby providing an optimized charging solution.

[0096] (2) Multi-voltage support: The USB PD protocol can support voltage ranges from 5V to 20V. The first power controller PD1 and the second power controller PD2 can be used to switch between different voltage levels to meet the needs of different devices.

[0097] (3) Protection functions: The first power supply controller PD1 and the second power supply controller PD2 can have a variety of protection mechanisms, such as over-voltage protection (OVP), under-voltage protection (UVP), and over-current protection (OCP), to ensure the safety of the charging process.

[0098] (4) Communication function: The first power supply controller PD1 and the second power supply controller PD2 can coordinate data transmission and power transmission through the USB Type-C interface to ensure that the device can transmit data and power at the same time.

[0099] The following will describe in detail, through different embodiments, the display device of the present invention with multiple power supply functions, which determines different power supply paths according to the power supply capacity of the external power adapter.

[0100] Assuming the USB module UM has a design power of 45W, when the power supply capability of the first interface Type-C_IN of the display device DIS is ≤45W, it represents the external power supply device electrically connected to the first interface Type-C_IN (e.g., Figure 1 The power supply capacity of the power adapter (ADP) is insufficient. The control circuit MCU turns off the third switch SW3, so that the multi-channel power path switching circuit PSC continues to be directly powered by the internal power supply PW to the USB module UM without turning on the first interface Type-C_IN power supply.

[0101] like Figure 2As shown, assuming the design power of the USB module UM is 45W and the second power supply requirement of the third interface TBT_OUT is 65W, when 45W < the power supply capability of the first interface Type-C_IN ≤ 65W, it means that the power supply capability of the first interface Type-C_IN is sufficient to meet the design power of the USB module UM. The control circuit MCU can turn on the third switch SW3, so that the multi-channel power path switching circuit PSC switches to supply power to the USB module UM through the first power supply path PTH1 via the first interface Type-C_IN and simultaneously cuts off the power supply of the internal power supply PW. However, the power supply capability of the first interface Type-C_IN still cannot meet the second power supply requirement of the third interface TBT_OUT.

[0102] like Figure 3 As shown, when 65W < the power supply capability of the first interface Type-C_IN ≤ 120W, it means that the power supply capability of the first interface Type-C_IN is sufficient to meet the second power supply requirements of the third interface TBT_OUT. The control circuit MCU can turn on the fourth switch SW4, so that the first interface Type-C_IN can directly supply power to the third interface TBT_OUT through the second power supply path PTH2, thereby saving the power loss caused by the second power management circuit PMIC2.

[0103] like Figure 2 As shown, when 120W < the power supply capability of the first interface Type-C_IN ≤ 150W, it means that the power supply capability of the first interface Type-C_IN is sufficient to simultaneously meet the design power of the USB module UM and the second power supply requirement of the third interface TBT_OUT. The control circuit MCU can simultaneously turn on the third switch SW3, the fifth switch SW5 and the sixth switch SW6, so that the first interface Type-C_IN can supply power to the USB module UM through the first power supply path PTH1 and supply power to the third interface TBT_OUT through the third power supply path PTH3.

[0104] like Figure 2 As shown, when 150W < the power supply capacity of the first interface Type-C_IN ≤ 200W, it means that the power supply capacity of the first interface Type-C_IN should be sufficient to meet the first power supply requirements of the second interface TBT_IN. The control circuit MCU can turn on the first switch SW1, so that the first interface Type-C_IN can be powered to the first power management circuit PMIC1 through the fourth power supply path PTH4, and then the first power management circuit PMIC1 will reasonably allocate the power to the second interface TBT_IN according to the actual power.

[0105] like Figure 2As shown, when 200W < the power supply capacity of the first interface Type-C_IN ≤ 250W, it means that the power supply capacity of the first interface Type-C_IN should be sufficient to simultaneously meet the design power of the USB module UM and the first power supply requirement of the second interface TBT_IN. The control circuit MCU can simultaneously turn on the first switch SW1 and the third switch SW3, so that the first interface Type-C_IN can supply power to the USB module UM through the first power supply path PTH1 and supply power to the first power management circuit PMIC1 through the fourth power supply path PTH4. The first power management circuit PMIC1 then distributes the power to the second interface TBT_IN according to the actual power.

[0106] like Figure 2 As shown, when 250W < the power supply capacity of the first interface Type-C_IN ≤ 300W, it means that the power supply capacity of the first interface Type-C_IN should be sufficient to simultaneously meet the design power of the USB module UM and the second power supply requirements of the third interface TBT_OUT. The control circuit MCU can simultaneously turn on the first switch SW1, the fifth switch SW5 and the sixth switch SW6, so that the first interface Type-C_IN can supply power to the third interface TBT_OUT through the third power supply path PTH3 and supply power to the first power management circuit PMIC1 through the fourth power supply path PTH4. The first power management circuit PMIC1 then distributes the power to the second interface TBT_IN according to the actual power.

[0107] like Figure 2 As shown, when 300W < the power supply capability of the first interface Type-C_IN, it means that the power supply capability of the first interface Type-C_IN should be sufficient to simultaneously meet the design power of the USB module UM, the first power supply requirement of the second interface TBT_IN, and the second power supply requirement of the third interface TBT_OUT. The control circuit MCU can simultaneously turn on the first switch SW1, the third switch SW3, the fifth switch SW5, and the sixth switch SW6, so that the first interface Type-C_IN can supply power to the USB module UM through the first power supply path PTH1, supply power to the third interface TBT_OUT through the third power supply path PTH3, and supply power to the first power management circuit PMIC1 through the fourth power supply path PTH4. The first power management circuit PMIC1 then distributes the power to the second interface TBT_IN according to the actual power.

[0108] It should be noted that although the above embodiment is illustrated by the example of the power adapter being electrically connected to the first interface Type-C CUFP, the present invention can actually be designed to be more flexibly connected to any Type-C interface by the power adapter being electrically connected to the ADP according to customized specifications and cost considerations, and is not limited thereto.

[0109] In practical applications, the design of the multi-channel power path switching circuit PSC must meet the following conditions: (1) When the display device DIS does not receive power from the first interface Type-C_IN which has power supply capability, the internal power supply PW of the display device DIS directly supplies power to the USB module UM; and (2) When the display device DIS receives power from the first interface Type-C_IN, it prioritizes seamlessly switching to the power supply of the first interface Type-C_IN to supply power to the USB module UM and simultaneously cuts off the power supply of the display's internal power supply PW.

[0110] In one embodiment, such as Figure 4 and Figure 5 As shown, the multi-channel power path switching circuit PSC may include P-type high-power metal-oxide-semiconductor field-effect transistors (MOSFETs) Q1-Q3, diode D1, Schottky diode D2, capacitors C1-C3, and resistors R1-R6. Diode D1 is electrically connected between the power adapter ADP and the USB module power input terminal USBPWR_IN. P-type high-power MOSFET Q1 is electrically connected to the internal power input terminal PWR_IN, the USB module power input terminal USBPWR_IN, and P-type high-power MOSFET Q2. P-type high-power MOSFET Q2 is electrically connected to P-type high-power MOSFET Q1, P-type high-power MOSFET Q3, and ground GND. P-type high-power MOSFET Q3 is electrically connected to P-type high-power MOSFET Q2, resistors R4 and R5, and ground GND. Resistor R1 is electrically connected between the internal power input terminal BPWR_IN and resistor R6. Resistors R2 and R3 are connected in series between the internal power input terminal BPWR_IN and ground GND. Resistors R4 and R5 are connected in series between the power adapter's ADP terminal and the ground terminal GND. Resistor R6 is electrically connected between P-type high-power MOSFETs Q1 and Q2. Capacitor C1 is electrically connected between the internal power input terminal BPWR_IN and the ground terminal GND. Capacitor C2 is electrically connected between the internal power input terminal BPWR_IN and resistor R6. Capacitor C3 is electrically connected between the USB module's power input terminal USBPWR_IN and the ground terminal GND. Schottky diode D2 is electrically connected between the internal power input terminal BPWR_IN and resistor R6, and the voltage drop of Schottky diode D2 is only 0.25V.

[0111] It should be noted that, under normal circumstances without special design, the internal power input terminal BPWR_IN of the display device DIS will not be damaged by power backflow. Figure 4 and Figure 5The design of the multi-channel power path switching circuit PSC in the middle can eliminate the need for another P-type high-power MOSFET that is traditionally set back-to-back with the P-type high-power MOSFET Q1 to avoid power backflow, thus greatly saving cost and circuit area.

[0112] Please refer to Figure 4 When the display device does not receive power from the power adapter ADP, P-type high-power MOSFETs Q1 and Q2 are turned on and diodes D1 and Q3 are turned off. The power supply path of the internal power input terminal BPWR_IN is supplied to the USB module power input terminal USBPWR_IN through the high-power MOSFET Q1 and sequentially to the ground terminal GND through resistors R2 and R3, as shown by the thick black arrow.

[0113] Please refer to Figure 5 When the display device receives power from the power adapter ADP, P-type high-power MOSFETs Q1 and Q2 are turned off and diodes D1 and Q3 are turned on. The power supply path of the power adapter ADP is through diode D1 to the power input terminal USBPWR_IN of the USB module and then through resistors R4 and R5 to the ground terminal GND, as shown by the thick black arrow.

[0114] It should be noted that, based on a comprehensive consideration of cost, efficiency, and flexibility, Figure 2 The second power management circuit, PMIC2, can be a power management chip (such as MP420*) capable of bidirectional power transmission and management, enabling... Figure 2 The third interface TBT_OUT can share the second power management circuit PMIC2 with the first interface Type-C_IN to realize the multi-power supply (Multi-PD) function.

[0115] In one embodiment, such as Figures 6 to 9As shown, the second power management circuit PMIC2 supporting gallium nitride (GaN) may include four external N-type metal-oxide-semiconductor field-effect transistors (MOSFETs) M1 to M4 and an inductor L. N-type MOSFET M2 is electrically connected between N-type MOSFET M1 and ground GND. N-type MOSFET M3 is electrically connected between N-type MOSFET M4 and ground GND. The first terminal of inductor L is electrically connected to the first node N1 between N-type MOSFETs M1 and M2, and the second terminal of inductor L is electrically connected to the second node N2 between N-type MOSFETs M3 and M4. The gates of N-type MOSFETs M1 to M4 are controlled to be turned on or off by gate control signals HG1, LG1, LG2, and HG2, respectively.

[0116] It should be noted that the second power management circuit, PMIC2, is mainly used for buck-boost DC-DC power conversion. Based on the PDO coordinated by the power supply controller, it is responsible for converting the input voltage to the voltage levels required by multiple subsystems. For example, Figures 6 to 9 The diagrams illustrate the different power paths of the second power management circuit PMIC2 when it operates in the following states: boost state with left input and right output, buck state with left input and right output, boost state with right input and left output, and buck state with right input and left output.

[0117] like Figure 6 As shown, when the second power management circuit PMIC2 operates in a boost state with power input from the left end, N-type MOSFET M1 is turned on by the gate control signal HG1 and N-type MOSFET M2 is turned off by the gate control signal LG1, so that the first power path 1 and the second power path 2 flow sequentially through N-type MOSFET M1 and inductor L. When N-type MOSFET M3 is turned on by the gate control signal LG2 and N-type MOSFET M4 is turned off by the gate control signal HG2, the first power path 1 flows through inductor L, through N-type MOSFET M3, and to ground terminal GND. When N-type MOSFET M3 is turned off by the gate control signal LG2 and N-type MOSFET M4 is turned on by the gate control signal HG2, the second power path 2 flows through inductor L, through N-type MOSFET M4, and is output from the right end.

[0118] like Figure 7As shown, when the second power management circuit PMIC2 operates in a buck state with power input from the left end, when N-type MOSFET M1 is turned on by gate control signal HG1, N-type MOSFET M2 is turned off by gate control signal LG1, N-type MOSFET M3 is turned off by gate control signal LG2, and N-type MOSFET M4 is turned on by gate control signal HG2, the first power path 1 flows sequentially through N-type MOSFET M1, inductor L, and N-type MOSFET M4 before being output from the right end. When N-type MOSFET M1 is turned off by gate control signal HG1, N-type MOSFET M2 is turned off by gate control signal LG1, N-type MOSFET M3 is turned on by gate control signal LG2, and N-type MOSFET M4 is turned on by gate control signal HG2, the second power path 2 flows sequentially from the ground terminal GND through N-type MOSFETs M3 and M4 before being output from the right end.

[0119] like Figure 8 As shown, when the second power management circuit PMIC2 operates in boost mode with power input from the right end, N-type MOSFET M4 is turned on by gate control signal HG2 and N-type MOSFET M3 is turned off by gate control signal LG2, so that the first power path 1 and the second power path 2 flow sequentially through N-type MOSFET M4 and inductor L. When N-type MOSFET M2 is turned on by gate control signal LG1 and N-type MOSFET M1 is turned off by gate control signal HG1, the first power path 1 flows through inductor L, through N-type MOSFET M2, and then to ground terminal GND. When N-type MOSFET M2 is turned off by gate control signal LG1 and N-type MOSFET M1 is turned on by gate control signal HG1, the second power path 2 flows through inductor L, through N-type MOSFET M1, and then outputs from the left end.

[0120] like Figure 9As shown, when the second power management circuit PMIC2 operates in a buck state with power input from the right end, when N-type MOSFET M4 is turned on by gate control signal HG2, N-type MOSFET M3 is turned off by gate control signal LG2, N-type MOSFET M2 is turned off by gate control signal LG1, and N-type MOSFET M1 is turned on by gate control signal HG1, the first power path 1 flows sequentially through N-type MOSFET M4, inductor L, and N-type MOSFET M1 before being output from the left end. When N-type MOSFET M4 is turned off by gate control signal HG2, N-type MOSFET M3 is turned off by gate control signal LG2, N-type MOSFET M2 is turned on by gate control signal LG1, and N-type MOSFET M1 is turned on by gate control signal HG1, the second power path 2 flows sequentially from the ground terminal GND through N-type MOSFET M2 and N-type MOSFET M1 before being output from the left end.

[0121] Please refer to Figures 10A to 10E , Figures 10A to 10E A flowchart illustrating a display device operation method according to an embodiment of the present invention is shown. Figure 10A As shown, the operation method of the display device includes the following steps:

[0122] Step S1: Determine whether the first interface has power supply capability (e.g., determine whether the first interface is electrically connected). Figure 1 The power adapter (ADP) in the middle;

[0123] Step S2: In response to the determination result of step S1 being yes, determine whether the second interface has a first power supply requirement (e.g., determine whether the second interface is electrically connected). Figure 1 Whether the first device DE1 and the third interface have a second power supply requirement (e.g., determining whether the third interface is electrically connected). Figure 1 The second device (DE2) in the middle;

[0124] Step S3: In response to the negative result of step S1, the display device is powered by its internal power supply.

[0125] Step S4: The judgment result of step S2 is that the second interface has a first power supply requirement and the third interface has a second power supply requirement;

[0126] Step S5: The judgment result of step S2 is that the second interface has the first power supply requirement while the third interface does not have the second power supply requirement;

[0127] Step S6: The judgment result of step S2 is that the third interface has a second power supply requirement while the second interface does not have a first power supply requirement; and

[0128] Step S7: The judgment result of step S2 is that the second interface does not have the first power supply requirement and the third interface does not have the second power supply requirement.

[0129] Next, the subsequent steps corresponding to the four different judgment results of step S2 (i.e., steps S4 to S7) will be explained in detail.

[0130] like Figure 10B As shown, in response to the first interface having power supply capability, the second interface having a first power supply requirement, and the third interface having a second power supply requirement, the method further performs step S40: comparing the power supply capability of the first interface, the first power supply requirement of the second interface, the second power supply requirement of the third interface, and the USB module (e.g., Figure 2 The design power of the USB module (UM) in the first comparison was used to generate the first comparison result.

[0131] Based on the different first comparison results generated in step S40, the following possible scenarios may occur:

[0132] (1) In response to the first comparison result that the first power supply requirement of the second interface, the second power supply requirement of the third interface, and the design power of the USB module are all greater than the power supply capability of the first interface (step S41), Figure 2 The control circuit MCU turns on the second switch SW2, the fifth switch SW5 and the eighth switch SW8 and turns off the first switch SW1, the third switch SW3, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S42).

[0133] (2) In response to the first comparison result that the power supply capability of the first interface is greater than or equal to the design power of the USB module but less than the second power supply requirement of the third interface (step S43), Figure 2 The control circuit MCU turns on the second switch SW2, the third switch SW3, the fifth switch SW5 and the eighth switch SW8 and turns off the first switch SW1, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S44).

[0134] (3) In response to the first comparison result that the power supply capability of the first interface is greater than or equal to the second power supply requirement of the third interface but less than the sum of the design power of the USB module and a second specific value (e.g., the second power supply requirement of the third interface divided by 0.9) (step S45), Figure 2 The control circuit MCU turns on the second switch SW2 and the fourth switch SW4 and turns off the first switch SW1, the third switch SW3, the fifth switch SW5, the sixth switch SW6, the seventh switch SW7 and the eighth switch SW8 (step S46);

[0135] (4) In response to the first comparison result being that the power supply capability of the first interface is greater than or equal to the sum of the design power of the USB module and the second specific value (e.g., the second power supply requirement of the third interface divided by 0.9) but less than the sum of the design power of the USB module, the first specific value (e.g., the first power supply requirement of the second interface divided by 0.9) and the second specific value (e.g., the second power supply requirement of the third interface divided by 0.9) (step S47), Figure 2 The control circuit MCU in the middle turns on the second switch SW2, the third switch SW3, the fifth switch SW5, and the sixth switch SW6, and turns off the first switch SW1, the fourth switch SW4, the seventh switch SW7, and the eighth switch SW8 (step S48); and

[0136] (5) In response to the first comparison result being that the power supply capability of the first interface is greater than or equal to the design power of the USB module, the sum of a first specific value (e.g., the first power supply requirement of the second interface divided by 0.9) and a second specific value (e.g., the second power supply requirement of the third interface divided by 0.9) (step S49), Figure 2 The control circuit MCU turns on the first switch SW1, the third switch SW3, the fifth switch SW5 and the sixth switch SW6 and turns off the second switch SW2, the fourth switch SW4, the seventh switch SW7 and the eighth switch SW8 (step S50).

[0137] like Figure 10C As shown, in response to the first interface having power supply capability, the second interface having a first power supply requirement, and the third interface not having a second power supply requirement, the method further performs step S51: comparing the power supply capability of the first interface, the first power supply requirement of the second interface, and the design power of the USB module to generate a second comparison result.

[0138] Based on the different second comparison results generated in step S51, the following are some possible scenarios:

[0139] (1) In response to the second comparison result that the first power supply requirement of the second interface and the design power of the USB module are both greater than the power supply capability of the first interface (step S52), Figure 2 The control circuit MCU turns on the second switch SW2, the fifth switch SW5 and the eighth switch SW8 and turns off the first switch SW1, the third switch SW3, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S53);

[0140] (2) In response to the second comparison result that the power supply capability of the first interface is greater than or equal to the design power of the USB module but less than the sum of the design power of the USB module and a first specific value (e.g., the first power supply requirement of the second interface divided by 0.9) (step S54), Figure 2The control circuit MCU in the middle turns on the second switch SW2, the third switch SW3, the fifth switch SW5, and the eighth switch SW8, and turns off the first switch SW1, the fourth switch SW4, the sixth switch SW6, and the seventh switch SW7 (step S55); and

[0141] (3) In response to the second comparison result that the power supply capability of the first interface is greater than or equal to the sum of the design power of the USB module and a first specific value (e.g., the first power supply requirement of the second interface divided by 0.9) (step S56), Figure 2 The control circuit MCU turns on the first switch SW1, the third switch SW3, the fifth switch SW5 and the eighth switch SW8 and turns off the second switch SW2, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S57).

[0142] like Figure 10D As shown, in response to the first interface having power supply capability, the third interface having a second power supply requirement, and the second interface not having a first power supply requirement, the method further performs step S60: comparing the power supply capability of the first interface, the second power supply requirement of the third interface, and the design power of the USB module to generate a third comparison result.

[0143] Based on the different third comparison results generated in step S60, the following possible scenarios may occur:

[0144] (1) In response to the third comparison result that the second power supply requirement of the third interface and the design power of the USB module are both greater than the power supply capability of the first interface (step S61), Figure 2 The control circuit MCU turns on the second switch SW2, the fifth switch SW5 and the eighth switch SW8 and turns off the first switch SW1, the third switch SW3, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S62).

[0145] (2) In response to the third comparison result that the power supply capability of the first interface is greater than or equal to the design power of the USB module but less than the second power supply requirement of the third interface (step S63), Figure 2 The control circuit MCU turns on the second switch SW2, the third switch SW3, the fifth switch SW5 and the eighth switch SW8 and turns off the first switch SW1, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S64).

[0146] (3) In response to the third comparison result that the power supply capability of the first interface is greater than or equal to the second power supply requirement of the third interface but less than the sum of the design power of the USB module and a second specific value (e.g., the second power supply requirement of the third interface divided by 0.9) (step S65), Figure 2The control circuit MCU turns on the second switch SW2 and the fourth switch SW4 and turns off the first switch SW1, the third switch SW3, the fifth switch SW5, the sixth switch SW6, the seventh switch SW7 and the eighth switch SW8 (step S66); and

[0147] (4) In response to the third comparison result that the power supply capability of the first interface is greater than or equal to the sum of the design power of the USB module and the second specific value (e.g., the second power supply requirement of the third interface divided by 0.9) (step S67), Figure 2 The control circuit MCU turns on the second switch SW2, the third switch SW3, the fifth switch SW5 and the sixth switch SW6 and turns off the first switch SW1, the fourth switch SW4, the seventh switch SW7 and the eighth switch SW8 (step S68).

[0148] like Figure 10E As shown, in response to the first interface having power supply capability and the second and third interfaces not having power supply requirements, the method further executes step S70: comparing the power supply capability of the first interface with the design power of the USB module to generate a fourth comparison result.

[0149] Based on the different fourth comparison results generated in step S70, the following are some possible scenarios:

[0150] (1) In response to the fourth comparison result that the power supply capability of the first interface is less than the design power of the USB module (step S71), Figure 2 The control circuit MCU in the middle turns on the second switch SW2, the fifth switch SW5, and the eighth switch SW8, and turns off the first switch SW1, the third switch SW3, the fourth switch SW4, the sixth switch SW6, and the seventh switch SW7 (step S72); and

[0151] (2) In response to the fourth comparison result being that the power supply capability of the first interface is greater than or equal to the design power of the USB module (step S73), Figure 2 The control circuit MCU turns on the second switch SW2, the third switch SW3, the fifth switch SW5 and the eighth switch SW8 and turns off the first switch SW1, the fourth switch SW4, the sixth switch SW6 and the seventh switch SW7 (step S74).

[0152] In summary, the display device and its operation method with multiple power supply functions proposed in this invention can effectively increase the total power supply of the display device by reusing the power supply capacity of idle power adapters through the design of the power supply controller and power management circuit. This enables the display device to simultaneously power one or more external devices to achieve multiple power supply functions. This not only significantly reduces the number of connection cables and chargers on the office desk, making the overall work environment cleaner and more efficient, but also significantly reduces the generation of electronic waste and the large amount of materials and energy consumed in manufacturing new power adapters, as well as the emission of greenhouse gases such as carbon dioxide. This achieves the goals of resource conservation, efficient utilization, and carbon footprint reduction.

[0153] The above-disclosed content is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the claims of the present invention. Therefore, any equivalent technical changes made based on the content of the present invention specification and drawings shall fall within the scope of the claims of the present invention.

Claims

1. A display device with multiple power supply functions, the display device comprising: One internal power supply; First interface; A second interface; A first power supply controller is electrically connected to the first interface, and the first power supply controller is configured to determine whether the first interface has a power supply capability; A second power supply controller is electrically connected to the second interface, and the second power supply controller is configured to determine whether the second interface has a first power supply requirement; as well as A control circuit electrically connected to the first power supply controller and the second power supply controller, the control circuit being configured to selectively determine whether to supply power from the internal power supply and / or the first interface based on a first judgment result of the first power supply controller, a second judgment result of the second power supply controller, the power supply capacity and the first power supply requirement.

2. The display device as claimed in claim 1, further comprising: A third interface, which is electrically connected to the second power supply controller. The second power supply controller is also configured to determine whether the third interface has a second power supply requirement.

3. The display device as claimed in claim 2, further comprising: A first power management circuit is electrically connected to the second interface; A first switch is electrically connected between the first interface and the first power management circuit; A second switch, which is electrically connected between the internal power supply and the first power management circuit; A USB module; A multi-channel power path switching circuit is electrically connected between the internal power supply and the USB module, and can be configured to selectively supply power to the USB module directly from the internal power supply or switch to supply power to the USB module from the first interface. A third switch is electrically connected between the first interface and the multi-channel power path switching circuit; A fourth switch is electrically connected between the first interface and the third interface; A fifth switch, which is electrically connected to the third interface; A sixth switch, which is electrically connected to the first interface; A second power management circuit is electrically connected between the fifth switch and the sixth switch; A seventh switch, which is electrically connected between the internal power supply and the second power management circuit; as well as An eighth switch is electrically connected between the internal power supply and the second power management circuit. The first switch to the eighth switch are all electrically connected to the control circuit.

4. The display device of claim 3, wherein in response to the first determination result of the first power supply controller being that the first interface has the power supply capability, and the second determination result of the second power supply controller being that the second interface has the first power supply requirement and the third interface has the second power supply requirement, the control circuit compares the power supply capability of the first interface, the first power supply requirement of the second interface, the second power supply requirement of the third interface, and a design power of the USB module to generate a first comparison result.

5. The display device of claim 4, wherein in response to the first comparison result that the first power supply requirement of the second interface, the second power supply requirement of the third interface, and the design power of the USB module are all greater than the power supply capability of the first interface, the control circuit turns on the second switch, the fifth switch, and the eighth switch and turns off the first switch, the third switch, the fourth switch, the sixth switch, and the seventh switch.

6. The display device of claim 4, wherein in response to the first comparison result that the power supply capability of the first interface is greater than or equal to the design power of the USB module but less than the second power supply requirement of the third interface, the control circuit turns on the second switch, the third switch, the fifth switch and the eighth switch and turns off the first switch, the fourth switch, the sixth switch and the seventh switch.

7. The display device of claim 4, wherein in response to the first comparison result that the power supply capability of the first interface is greater than or equal to the second power supply requirement of the third interface but less than the sum of the design power of the USB module and a second specific value, the control circuit turns on the second switch and the fourth switch and turns off the first switch, the third switch, the fifth switch, the sixth switch, the seventh switch and the eighth switch, wherein the second specific value is obtained by dividing the second power supply requirement of the third interface by a specific ratio.

8. The display device of claim 4, wherein in response to the first comparison result being that the power supply capability of the first interface is greater than or equal to the sum of the design power of the USB module and a second specific value but less than the sum of the design power of the USB module, the first specific value and the second specific value, the control circuit turns on the second switch, the third switch, the fifth switch and the sixth switch and turns off the first switch, the fourth switch, the seventh switch and the eighth switch, wherein the first specific value is obtained by dividing the first power supply requirement of the second interface by a specific ratio and the second specific value is obtained by dividing the second power supply requirement of the third interface by the specific ratio.

9. The display device of claim 4, wherein in response to the first comparison result being that the power supply capability of the first interface is greater than or equal to the design power of the USB module, a first specific value, and a second specific value, the control circuit turns on the first switch, the third switch, the fifth switch, and the sixth switch and turns off the second switch, the fourth switch, the seventh switch, and the eighth switch, wherein the first specific value is obtained by dividing the first power supply requirement of the second interface by a specific ratio, and the second specific value is obtained by dividing the second power supply requirement of the third interface by the specific ratio.

10. The display device of claim 3, wherein in response to the first determination result that the first interface has the power supply capability, the second determination result that the second interface has the first power supply requirement and the third interface does not have the second power supply requirement, the control circuit compares the power supply capability of the first interface, the first power supply requirement of the second interface and a design power of the USB module to generate a second comparison result.

11. The display device of claim 10, wherein in response to the second comparison result that the first power supply requirement of the second interface and the design power of the USB module are both greater than the power supply capability of the first interface, the control circuit turns on the second switch, the fifth switch and the eighth switch and turns off the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch. In response to the second comparison result that the power supply capability of the first interface is greater than or equal to the design power of the USB module but less than the sum of the design power of the USB module and a first specific value, the control circuit turns on the second switch, the third switch, the fifth switch and the eighth switch and turns off the first switch, the fourth switch, the sixth switch and the seventh switch. In response to the second comparison result that the power supply capability of the first interface is greater than or equal to the sum of the design power of the USB module and the first specific value, the control circuit turns on the first switch, the third switch, the fifth switch and the eighth switch and turns off the second switch, the fourth switch, the sixth switch and the seventh switch, wherein the first specific value is obtained by dividing the first power supply requirement of the second interface by a specific ratio.

12. The display device of claim 3, wherein in response to the first determination result of the first power supply controller being that the first interface has the power supply capability, and the second determination result of the second power supply controller being that the third interface has the second power supply requirement and the second interface does not have the first power supply requirement, the control circuit compares the power supply capability of the first interface, the second power supply requirement of the third interface, and a design power of the USB module to generate a third comparison result.

13. The display device of claim 12, wherein in response to the third comparison result that the second power supply requirement of the third interface and the design power of the USB module are both greater than the power supply capability of the first interface, the control circuit turns on the second switch, the fifth switch and the eighth switch and turns off the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch. In response to the third comparison result that the power supply capability of the first interface is greater than or equal to the design power of the USB module but less than the second power supply requirement of the third interface, the control circuit turns on the second switch, the fifth switch and the eighth switch and turns off the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch. In response to the third comparison result that the power supply capability of the first interface is greater than or equal to the second power supply requirement of the third interface but less than the sum of the design power of the USB module and a second specific value, the control circuit turns on the second switch, the fifth switch and the eighth switch and turns off the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch. In response to the third comparison result that the power supply capability of the first interface is greater than or equal to the sum of the design power of the USB module and the second specific value, the control circuit turns on the second switch, the fifth switch, and the eighth switch and turns off the first switch, the third switch, the fourth switch, the sixth switch, and the seventh switch, wherein the second specific value is obtained by dividing the second power supply requirement of the third interface by the specific ratio.

14. The display device of claim 3, wherein the multi-channel power path switching circuit comprises: An internal power input terminal is electrically connected to the internal power source. A USB module power input terminal, which is electrically connected to the USB module; A first P-type high-power MOSFET, the first P-type high-power MOSFET being electrically connected between the internal power input terminal and the power input terminal of the USB module; and A diode is electrically connected between the first interface and the power input terminal of the USB module.

15. The display device of claim 14, wherein the multi-channel power path switching circuit further comprises: A second P-type high-power MOSFET is electrically connected to the first P-type high-power MOSFET, a third P-type high-power MOSFET, and a ground terminal. The third P-type high-power MOSFET is electrically connected to the second P-type high-power MOSFET and the ground terminal, respectively; A first resistor, which is electrically connected to the internal power input terminal; A second resistor and a third resistor are connected in series between the internal power input terminal and the ground terminal; A fourth resistor and a fifth resistor are connected in series between the first interface and the ground terminal; A sixth resistor is electrically connected between the first P-type high-power MOSFET and the second P-type high-power MOSFET; A first capacitor is electrically connected between the internal power input terminal and the ground terminal; A second capacitor is electrically connected between the internal power input terminal and the sixth resistor; A third capacitor, which is electrically connected between the power input terminal of the USB module and the ground terminal; and A Schottky diode is electrically connected between the internal power input terminal and the sixth resistor.

16. A method of operating a display device, the method comprising: Determine whether a first interface of the display device has a power supply capability, so as to generate a first determination result; Determine whether a second interface of the display device has a first power supply requirement, so as to generate a second determination result; as well as Based on the first judgment result and the second judgment result, the power supply capability and the first power supply requirement, it is selectively determined that the display device will be powered by an internal power supply and / or the first interface.

17. The operation method of claim 16, wherein the second determination result further includes whether a third interface of the display device has a second power supply requirement.

18. The method of operation as claimed in claim 17, further comprising: In response to the first determination result that the first interface has the power supply capability, the second determination result that the second interface has the first power supply requirement and the third interface has the second power supply requirement, the power supply capability of the first interface, the first power supply requirement of the second interface, the second power supply requirement of the third interface and a design power of a USB module of the display device are compared to generate a first comparison result. as well as Based on the first comparison result, it is selectively determined whether to supply power from the internal power supply and / or the first interface.

19. The method of operation as claimed in claim 17, further comprising: In response to the first determination result that the first interface has the power supply capability, the second determination result that the second interface has the first power supply requirement and the third interface does not have the second power supply requirement, the power supply capability, the first power supply requirement and a design power of a USB module of the display device are compared to generate a second comparison result; as well as Based on the second comparison result, it is selectively determined whether to supply power from the internal power source and / or the first interface.

20. The method of operation as claimed in claim 17, further comprising: In response to the first determination result that the first interface has the power supply capability, the second determination result that the third interface has the second power supply requirement and the second interface does not have the first power supply requirement, the power supply capability, the second power supply requirement and a design power of a USB module of the display device are compared to generate a third comparison result; as well as Based on the third comparison result, it is selectively determined whether to supply power from the internal power source and / or the first interface.

Images