CN111078177B - Intelligent blackboard USB multi-screen display switching equipment - Google Patents
Intelligent blackboard USB multi-screen display switching equipment Download PDFInfo
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- CN111078177B CN111078177B CN201911382391.7A CN201911382391A CN111078177B CN 111078177 B CN111078177 B CN 111078177B CN 201911382391 A CN201911382391 A CN 201911382391A CN 111078177 B CN111078177 B CN 111078177B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Position Input By Displaying (AREA)
- Power Sources (AREA)
Abstract
The invention relates to intelligent blackboard USB multi-screen display switching equipment which is used for switching to a certain electronic touch pad to be displayed when a plurality of electronic touch pads are connected with one display device, wherein the switching equipment comprises a plurality of USB hubs, a central processing unit and a plurality of double-channel USB signal switches, the USB hubs and the double-channel USB signal switches are respectively and electrically connected with the central processing unit, the USB hubs are respectively connected with USB interfaces of the electronic touch pads and USB interfaces of the display device so as to transmit the content of the electronic touch pad to the display device for display, the double-channel USB signal switches are used for completing signal switching of the switching device, and the central processing unit is used for managing and controlling the switching device to work normally. The electronic touch control panel can be switched by controlling the switching button, and the switching mode is simple.
Description
Technical Field
The invention relates to the technical field of electronic touch pad switching, in particular to intelligent blackboard USB multi-screen display switching equipment.
Background
The electronic touch control board is used as the latest computer input equipment, and is a simple, convenient and natural man-machine interaction mode. The method gives the multimedia a brand-new appearance, is very attractive and novel multimedia interaction equipment, and is mainly applied to public information inquiry, industrial control, military command, electronic games, multimedia teaching and the like. The intelligent blackboard (also called intelligent classroom interactive blackboard) is a high-tech electronic product which replaces the traditional blackboard, integrates the liquid crystal display technology, the touch technology and the computer technology, and adopts the writing software and the writing pen with the accurate recognition function, so that the information processing is more convenient, and the teaching calculation and demonstration are more vivid.
In the prior art, an electronic touch pad mainly aims at 1-to-1 touch display, does not support multi-screen switching display, and has the problem that a plurality of touch pads cannot be freely and simply switched with 1 computer or display screen.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a smart blackboard USB multi-screen display switching device for switching between a plurality of touch pads and a display screen or computer.
The utility model provides a wisdom blackboard USB multi-screen display switching equipment, is used for when many electron touch-control boards and a display device connect, switches to one that needs to show the electron touch-control board, and it includes multichannel USB hub circuit, central processing unit circuit and multichannel binary channels USB signal switching circuit, multichannel USB hub circuit, multichannel binary channels USB signal switching circuit respectively with central processing unit circuit electricity is connected, multichannel USB hub circuit and multichannel binary channels USB signal switching circuit are electric connection respectively, and multichannel binary channels USB signal switching circuit is connected with the USB interface of multichannel electron touch-control board respectively, USB hub circuit is connected with the USB interface electricity of display device, in order will the content transmission of electron touch-control board shows to the display device, binary channels USB signal switching circuit is used for accomplishing the signal switching of switching device, central processing unit circuit is used for managing and controlling switching device carries out normal work.
Preferably, the smart blackboard USB multi-screen display switching device further comprises a plurality of power supply switching circuits, wherein the power supply switching circuits are used for power supply and switching control of the switching device, and the plurality of power supply switching circuits are respectively and electrically connected with the plurality of USB hub circuits, the central processing unit circuit and the plurality of double-channel USB signal switching circuits.
Preferably, each path of USB hub circuit is provided with a plurality of USB hub interfaces, each USB hub interface is provided with a hub interface USB chip, each path of USB hub circuit is provided with a USB hub chip, each USB hub chip is provided with 28 pins, namely a pin 1-pin 28, and a pin 4, a pin 5, a pin 6, a pin 7, a pin 8 and a pin 9 of each USB hub chip are used for being electrically connected with a plurality of hub interface USB chips.
Preferably, each electronic touch pad is respectively provided with a touch pad USB interface, and each two-channel USB signal switching circuit is respectively externally connected with 2 touch pad USB interfaces.
Preferably, each channel of the dual-channel USB signal switching circuit has a signal switching chip and a 2 channels of touch pad USB chips, where the touch pad USB chips are connected to a touch pad USB interface, each signal switching chip has 10 pins, 1 st pin to 10 th pin, and each of the 2 nd pin, 3 rd pin, 7 th pin and 8 th pin of the signal switching chip is electrically connected to 2 touch pad USB chips.
Preferably, the central processing unit circuit has a CPU chip and a device USB chip, the CPU chip has an MCU serial port, the display device has a device serial port and a device USB interface, the MCU serial port is connected with the device serial port, the device USB chip is used for being connected with the device USB interface, the device USB chip is connected with the USB hub chip, and the pin 15, the pin 16, the pin 18 and the pin 20 are electrically connected with the device USB chip.
Preferably, the CPU chip further has a plurality of I/O ports, and the plurality of I/O ports are respectively connected to the power switching circuits and the pins 1.
Preferably, the central processing unit circuit is externally connected with a processor switching key for controlling signals for switching the USB, and the processor switching key is electrically connected with the CPU chip.
Preferably, the power supply switching circuits have a common power supply interface for external power supply.
Preferably, one of the electronic touch pads corresponds to one path of the power switching circuit, and each touch pad USB chip is electrically connected to each path of the power switching circuit.
In the intelligent blackboard USB multi-screen display switching device, a plurality of the double-channel USB signal switching circuits are respectively and electrically connected with the USB interfaces of the multi-channel electronic touch control board, the USB hub circuit is electrically connected with the USB interfaces of the display device, the content of the electronic touch control board is transmitted to the display device for display, the signal switching of the switching device is completed through the management and control of the CPU circuit and the double-channel USB signal switching circuits, and the content of the electronic touch control board to be displayed is switched and connected to the display device for display in a plurality of the electronic touch control boards, so that the interactive switching function of one display device and a plurality of the electronic touch control boards is effectively achieved.
Drawings
Fig. 1 is a schematic circuit structure connection diagram of a smart blackboard USB multi-screen display switching device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a USB hub circuit of a smart blackboard USB multi-screen display switching device according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of connection between a dual-channel USB signal switching circuit and an electronic touch panel, and a power switching circuit of a smart-blackboard USB multi-screen display switching device according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of connection between a central processing unit circuit and a display device of a smart blackboard USB multi-screen display switching device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific embodiments and drawings.
Referring to fig. 1 and 4, a smart blackboard USB multi-screen display switching device 100 according to an embodiment of the present invention is shown, and is used for switching to a certain electronic touch pad to be displayed when a plurality of electronic touch pads are connected to a display device 6. The smart blackboard USB multi-screen display switching device 100 comprises a plurality of USB hub circuits 1, a central processing unit circuit 2 and a plurality of double-channel USB signal switching circuits 3, wherein a plurality of the USB hub circuits 1 and a plurality of the double-channel USB signal switching circuits 3 are respectively and electrically connected with the central processing unit circuit 2, a plurality of the USB hub circuits 1 and a plurality of the double-channel USB signal switching circuits 3 are respectively and electrically connected with USB interfaces of a plurality of electronic touch pads, the USB hub circuits 1 are electrically connected with USB interfaces of the display device 6 so as to transmit contents of the electronic touch pads to the display device 6 for display, the double-channel USB signal switching circuits 3 are used for completing signal switching of the switching device 100, and the central processing unit circuit 2 is used for managing and controlling the switching device 100 to work normally. Further, the display device 6 includes a PC computer and a general display device.
Preferably, the smart blackboard USB multi-screen display switching device 100 further includes a plurality of power switching circuits 4 for power supply and switching control of the switching device 100, and the plurality of power switching circuits 4 are electrically connected to the plurality of USB hub circuits 1, the central processing unit circuit 2, and the plurality of dual-channel USB signal switching circuits 3, respectively.
Referring to fig. 2, each of the USB hub circuits 1 is provided with a plurality of USB hub interfaces, each of the USB hub interfaces is provided with a hub interface USB chip, each of the USB hub circuits 1 is provided with a USB hub chip 11, each of the USB hub chips 11 is provided with 28 pins, which are pins 1-28, respectively, and each of the pins 4, 5, 6, 7, 8 and 9 of the USB hub chip 11 is electrically connected with the plurality of hub interface USB chips.
Further, in the embodiment of the present invention, there is 1 path of the USB hub circuit 1, which has one USB hub chip 11. Further, one USB hub chip 11 may be connected to 3 hub interface USB chips, where the 3 hub interface USB chips are a first hub interface USB chip 121, a second hub interface USB chip 122, and a third hub interface USB chip 123, each of the hub interface USB chips has 6 pins, which are respectively a pin 1-pin 6, and a pin 4, a pin 5, and a pin 6 of each of the hub interface USB chips are respectively grounded; the pin 1 of each hub interface USB chip is electrically connected with the power supply switching circuit 4 respectively; pin 2 of the first hub interface USB chip 121 is connected to pin 4, and pin 3 is connected to pin 5; pin 2 of the second hub interface USB chip 122 is connected to pin 6, and pin 3 is connected to pin 7; pin 2 of the third hub interface USB chip 123 is connected to pin 8, and pin 3 is connected to pin 9.
Further, the pins 18 and 20 are electrically connected to the power switching circuit 4, respectively.
Referring to fig. 3, each of the electronic touch pads has a touch pad USB interface, and each of the two-channel USB signal switching circuits 3 is externally connected with 2 touch pad USB interfaces, i.e. 2 external electronic touch pads. Preferably, each two-channel USB signal switching circuit 3 has a signal switching chip 31 and 2 touch pad USB chips, where 2 touch pad USB chips are used to connect with 2 touch pad USB interfaces, each signal switching chip 31 has 10 pins, 1 st pin to 10 th pin, and each of 2 nd pin, 3 rd pin, 7 th pin and 8 th pin of the signal switching chip 31 is used to electrically connect with 2 touch pad USB chips.
Preferably, one electronic touch pad corresponds to one path of the power switching circuit 4, and each touch pad USB chip is electrically connected to each path of the power switching circuit 4, so that when the electronic touch pad is switched, the power switching circuit 4 is switched at the same time to keep normal power supply.
Further, the 2 electronic touch pads are a first electronic touch pad 51 and a second electronic touch pad 52,2, the touch pad USB interfaces respectively correspond to the 2 touch pad USB chips, the touch pad USB chips include a first touch pad USB chip 321 and a second touch pad USB chip 322, the first electronic touch pad 51 corresponds to the first touch pad USB chip 321, and the second electronic touch pad 52 corresponds to the second touch pad USB chip 322. The two touch pad USB chips are respectively provided with 6 pins, namely 1 st pin and 6 th pin, and the 4 th pin, the 5 th pin and the 6 th pin of each touch pad USB chip are respectively grounded; the 2 nd pin and the 3 rd pin of the first touch pad USB chip 321 are respectively connected with the 8 th pin and the 2 nd pin correspondingly; the 2 nd pin and the 3 rd pin of the second touch pad USB chip 322 are respectively connected with the 7 th pin and the 3 rd pin.
Further, the power supply switching circuit 4 has a switching terminal 41 and an input terminal 42. The touch pad USB chip is correspondingly connected with one power supply switching circuit 4, and the 1 st pin of the 2 touch pad USB chips is respectively connected with the switching ends 41 of the 2 power supply switching circuits 4 in a one-to-one correspondence mode.
Further, each electronic touch pad is provided with a switching key 53.
As shown in fig. 4, the central processing unit 2 has a CPU chip 21 and a device USB chip 22, the CPU chip 21 has an MCU serial port, the display device 6 has a device serial port and a device USB interface, the MCU serial port is connected to the device serial port, the device USB chip 22 is used to connect to the device USB interface, the device USB chip 22 is connected to the USB hub chip 11, and the pins 15, 16, 18 and 20 are electrically connected to the device USB chip 22.
Further, the device USB chip 22 has 6 pins, pin 1-pin 6, respectively, and the pins 4, 5 and 6 are grounded respectively; the pin 1 is electrically connected with the power supply switching circuit 4, the pin 18 and the pin 20 respectively; pin 2 and pin 3 are correspondingly connected to pin 16 and pin 15, respectively.
Preferably, the CPU chip 21 further has a plurality of I/O ports, and the plurality of I/O ports are respectively connected to the power switching circuit 4 and the pin 1. In the embodiment of the present invention, 2I/O ports are correspondingly connected to the input ends 42 of the 2 paths of the power switching circuits 4, respectively.
Preferably, the CPU circuit 2 is externally connected with a processor switching key 23 for controlling signals for switching USB, and the processor switching key 23 is electrically connected with the CPU chip 21.
As shown in fig. 3, the power switching circuit 4 has a common power interface 43 for external power.
Further, in the embodiment of the present invention, under the management control of the central processing unit circuit 2, a 1-path USB hub circuit 1 is used, and correspondingly provided with 1-path dual-channel USB signal switching circuit 3 and 2-path power switching circuit 4, and correspondingly externally connected with 2 electronic touch pads, so that the two electronic touch pads can be switched. In other embodiments, the multi-channel USB hub circuit 1 may be connected and used under the management control of the cpu circuit 2, and the number of the corresponding connected dual-channel USB signal switching circuits 3, power switching circuits 4, and external electronic touch pads may also be increased.
Further, in the embodiment of the present invention, the connection between the signal switching chip 31 and the multi-path power switching circuit 4 can be controlled by operating the processor switching button 23 under the control of the central processing unit circuit 2, so as to control the signal switching of the USB, thereby achieving the function of switching the electronic touch pad; the switching chip 3 and the multi-path power supply switching circuit 4 can be controlled to switch USB signals by operating the switching key 53 of the electronic touch pad and communicating with the CPU chip 21 through the serial port of the display device 6, so as to achieve the function of switching the electronic touch pad.
Further, the signal transmission sequence of the switching device 100 is: the touch pad USB interface of the electronic touch pad transmits signals to the dual-channel USB signal switching circuit 3, the dual-channel USB signal switching circuit 3 transmits signals to the USB hub circuit 1, and finally the signals are transmitted to the device USB interface of the display device 6.
In the intelligent blackboard USB multi-screen display switching device 100, the multi-channel USB signal switching circuit 3 and the multi-channel power supply switching circuit 4 are connected, the signal switching of the USB is controlled through the management and the control of the CPU circuit 2, a plurality of electronic touch panels can be connected, the switching between the electronic touch panels and the display device 6 is completed, the interactive switching problem of one display device 6 and a plurality of electronic touch panels is solved, the electronic touch panels are connected with the display device 6 through the USB, the connection mode is simple, the operation is convenient, and the intelligent blackboard USB multi-screen display switching device has wide application prospect.
It should be noted that the present invention is not limited to the above embodiments, and those skilled in the art can make other changes according to the inventive spirit of the present invention, and these changes according to the inventive spirit of the present invention should be included in the scope of the present invention as claimed.
Claims (9)
1. The intelligent blackboard USB multi-screen display switching device is used for switching to a certain electronic touch pad to be displayed when a plurality of electronic touch pads are connected with one display device, and is characterized by comprising a plurality of USB hub circuits, a central processing unit circuit and a plurality of double-channel USB signal switching circuits, wherein the USB hub circuits and the double-channel USB signal switching circuits are respectively and electrically connected with the central processing unit circuit, the USB hub circuits and the double-channel USB signal switching circuits are respectively and electrically connected, the USB interfaces of the double-channel USB signal switching circuits and the multi-channel electronic touch pad are respectively and electrically connected, the USB hub circuits and the USB interfaces of the display device are electrically connected to transmit the content of the electronic touch pad to the display device for displaying, the USB signal switching circuits are used for completing signal switching of the switching device, and the central processing unit circuit is used for managing and controlling the switching device to work normally;
the intelligent blackboard USB multi-screen display switching device further comprises a plurality of power supply switching circuits, which are used for power supply and switching control of the switching device, wherein the plurality of power supply switching circuits are respectively and electrically connected with the plurality of USB hub circuits, the central processing unit circuit and the plurality of double-channel USB signal switching circuits;
under the management control of the central processing unit circuit (2), a plurality of USB hub circuits (1) are connected and used at the same time, and the number of the corresponding connected double-channel USB signal switching circuits (3) and power supply switching circuits (4) and the number of external electronic touch pads are increased.
2. The intelligent blackboard USB multi-screen display switching device according to claim 1, wherein each path of the USB hub circuit is provided with a plurality of USB hub interfaces, each of the USB hub interfaces is provided with a hub interface USB chip, each path of the USB hub circuit is provided with a USB hub chip, each of the USB hub chips is provided with 28 pins, namely a pin 1-pin 28, respectively, and a pin 4, a pin 5, a pin 6, a pin 7, a pin 8 and a pin 9 of each of the USB hub chips are used for electrically connecting with the plurality of the hub interface USB chips.
3. The intelligent blackboard USB multi-screen display switching apparatus according to claim 2, wherein each of the electronic touch pads has a touch pad USB interface, and each of the two-channel USB signal switching circuits is externally connected with 2 touch pad USB interfaces.
4. The intelligent blackboard USB multi-screen display switching apparatus of claim 3, wherein each of the two-channel USB signal switching circuits has a signal switching chip and a 2-channel touchpad USB chip, the touchpad USB chips are configured to be connected to a touchpad USB interface, each of the signal switching chips has 10 pins, 1 st pin to 10 th pin, respectively, and each of the 2 nd pin, 3 rd pin, 7 th pin and 8 th pin of the signal switching chip is configured to be electrically connected to 2 of the touchpad USB chips.
5. The smart blackboard USB multi-screen display switching device of claim 4, wherein the central processor circuit has a CPU chip and a device USB chip, the CPU chip has an MCU serial port, the display device has a device serial port and a device USB interface, the MCU serial port is connected to the device serial port, the device USB chip is configured to be connected to the device USB interface, the device USB chip is connected to the USB hub chip, and the pins 15, 16, 18, and 20 are electrically connected to the device USB chip.
6. The smart blackboard USB multi-screen display switching device according to claim 5, wherein the CPU chip further has a plurality of I/O ports, and a plurality of the I/O ports are respectively connected to the power switching circuit and the pin 1.
7. The intelligent blackboard USB multi-screen display switching apparatus according to claim 5, wherein the central processing unit circuit is externally connected with a processor switching key for controlling the signal of switching USB, and the processor switching key is electrically connected with the CPU chip.
8. The smart blackboard USB multi-screen display switching device of claim 1, wherein the power switching circuits have a common power interface for external power.
9. The smart-blackboard USB multi-screen display switching device according to claim 4, wherein one of the electronic touch pads corresponds to one of the power switching circuits, and each of the touch pad USB chips is electrically connected to each of the power switching circuits.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911382391.7A CN111078177B (en) | 2019-12-27 | 2019-12-27 | Intelligent blackboard USB multi-screen display switching equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911382391.7A CN111078177B (en) | 2019-12-27 | 2019-12-27 | Intelligent blackboard USB multi-screen display switching equipment |
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| CN111078177A CN111078177A (en) | 2020-04-28 |
| CN111078177B true CN111078177B (en) | 2023-08-15 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204790706U (en) * | 2015-06-17 | 2015-11-18 | 深圳中电数码显示有限公司 | Touch all -in -one external device's control circuit |
| CN106339037A (en) * | 2016-08-30 | 2017-01-18 | 南京巨鲨显示科技有限公司 | Display device with multi-channel switching USB (Universal Serial Bus) hub |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM560725U (en) * | 2017-12-01 | 2018-05-21 | 映奧股份有限公司 | Extended and expanded USB 3.1 HUB |
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- 2019-12-27 CN CN201911382391.7A patent/CN111078177B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204790706U (en) * | 2015-06-17 | 2015-11-18 | 深圳中电数码显示有限公司 | Touch all -in -one external device's control circuit |
| CN106339037A (en) * | 2016-08-30 | 2017-01-18 | 南京巨鲨显示科技有限公司 | Display device with multi-channel switching USB (Universal Serial Bus) hub |
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| CN111078177A (en) | 2020-04-28 |
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