CN219592454U

CN219592454U - Multi-video-source switching circuit and interactive large screen

Info

Publication number: CN219592454U
Application number: CN202223241714.0U
Authority: CN
Inventors: 陈福斌; 汪帅; 王葆霖; 宋小清; 黄春微
Original assignee: Shenzhen Honghe Innovation Information Technology Co Ltd
Current assignee: Shenzhen Honghe Innovation Information Technology Co Ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-08-25
Anticipated expiration: 2032-12-02

Abstract

The utility model belongs to the technical field of display, and discloses a multi-video source switching circuit (100) and an interactive large screen, wherein a line concentration circuit (104) performs time-sharing multiplexing on a plurality of accessed USB receiving signals to output a composite signal; a control circuit (101) outputs a first selection signal and a second selection signal according to the composite signal; the USB switching circuit (102) is connected with a plurality of USB transmission signals, selects a target USB transmission signal out of the plurality of USB transmission signals to output according to the first selection signal, and converts the target USB transmission signal into a composite signal; a video switching circuit (103) is connected with a plurality of video signals, and selects a target video signal in the plurality of video signals to output according to a second selection signal; a control circuit (101) converts a target video signal into a video play signal; and when a plurality of persons cooperatively operate, different main equipment is switched conveniently and smoothly.

Description

Multi-video-source switching circuit and interactive large screen

Technical Field

The utility model belongs to the technical field of multi-video source display, and particularly relates to a multi-video source switching circuit.

Background

At present, the traditional large-screen product has few video interfaces and shares one universal serial bus (Universal Serial Bus, USB), when a plurality of main devices call the same large-screen device, wires are required to be frequently and manually plugged and unplugged, so that the switching of a plurality of video sources and a plurality of USB sending signals is realized, and the problem that when a plurality of persons operate cooperatively, the switching of different main devices is inconvenient and unsmooth is solved.

Disclosure of Invention

The utility model aims to provide a multi-video source switching circuit, which aims to solve the problems that when a plurality of users cooperatively operate in a traditional interactive large screen, different main equipment are inconvenient to switch and are not smooth.

The embodiment of the utility model provides a multi-video source switching circuit, which comprises a control circuit (101), a USB switching circuit (102), a video switching circuit (103) and a line concentration circuit (104);

the hub circuit (104) is connected with the control circuit (101) and the USB switching circuit (102), and the control circuit (101) is also connected with the USB switching circuit (102) and the video switching circuit (103);

the hub circuit (104) is configured to access a plurality of USB receiving signals, and perform time-division multiplexing on the plurality of USB receiving signals so as to output a composite signal;

-the USB switching circuit (102) is configured to transfer the composite signal to the control circuit (101);

the control circuit (101) is configured to output a first selection signal and a second selection signal according to the composite signal;

the USB switching circuit (102) is configured to access a plurality of USB transmission signals and select a target USB transmission signal output of the plurality of USB transmission signals according to the first selection signal,

the hub circuit (104) is further configured to transfer the target USB transmit signal;

the video switching circuit (103) is configured to access a plurality of video signals and select a target video signal output of the plurality of video signals according to the second selection signal; the control circuit (101) is further configured to convert the target video signal into a video playback signal.

In one embodiment, the control circuit (101) comprises a first microprocessor (U1), a first resistor (R1) and a second resistor (R2);

the control circuit (101) comprises a multiplexing signal input end, a target video signal input end, a video playing signal output end, a first selection signal output end and a second selection signal output end;

the multiplexing signal input end of the control circuit (101) is connected with the line concentration circuit (104) to access the multiplexing signal; a target video signal input end of the control circuit (101) is connected with the video switching circuit (103) so as to access the target video signal; the video playing signal output end of the control circuit (101) outputs the video playing signal; a first selection signal output end of the control circuit (101) is connected with the USB switching circuit (102) to output the first selection signal; a second selection signal output end of the control circuit (101) is connected with the video switching circuit (103) so as to output the second selection signal;

the multiplexing signal input end comprises a group of USB OTG (On-The-Go) negative electrode data input ends of The first microprocessor (U1) and a group of USB OTG positive electrode data input ends of The first microprocessor (U1);

the first selection signal output end comprises a first general purpose input output end of the first microprocessor (U1) and a second general purpose input output end of the first microprocessor (U1);

the first end of the first resistor (R1), the first end of the second resistor (R2), the I2C serial clock end of the first microprocessor (U1) and the I2C serial data end of the first microprocessor (U1) are used as a second selection signal output end of the control circuit (101) together;

the target video signal input comprises four pairs of differential inputs of the first microprocessor (U1);

the video playing signal output end comprises eight pairs of differential output ends of the first microprocessor (U1);

the second end of the first resistor (R1) and the second end of the second resistor (R2) are commonly connected to a first power supply.

In one embodiment, the USB switching circuit (102) comprises a USB multiplexer (U2), a third resistor (R3), a fourth resistor (R4) and a first capacitor (C1);

the power supply end of the USB multiplexer (U2), the first end of the first capacitor (C1), the first end of the third resistor (R3) and the first end of the fourth resistor (R4) are commonly connected to a second power supply; the second end of the first capacitor (C1) is connected to the power ground;

a first path selection control input of the USB multiplexer (U2) is connected with a second end of the third resistor; a second path selection control input of the USB multiplexer (U2) is connected with a second end of the fourth resistor; the first path selection control input end of the USB multiplexer (U2), the first end of the third resistor (R3), the second path selection control input end of the USB multiplexer (U2) and the first end of the fourth resistor (R4) are used as the first selection signal input end of the USB switching circuit (102) together and are connected with the control circuit (101) so as to access the first selection signal;

the first positive electrode data source path end of the USB multiplexer (U2) and the first negative electrode data source path end of the USB multiplexer (U2) are used as a first USB transmission signal input end of the USB switching circuit (102) and a composite signal first output end of the USB switching circuit (102) together, and are connected with a first main device so as to be connected with a first USB transmission signal and output the composite signal;

the second positive electrode data source path end of the USB multiplexer (U2) and the second negative electrode data source path end of the USB multiplexer (U2) are used as a second USB transmission signal input end of the USB switching circuit (102) and a composite signal second output end of the USB switching circuit (102) together, and are connected with a second main device so as to be connected with a second USB transmission signal and output the composite signal;

the third positive electrode data source path end of the USB multiplexer (U2) and the third negative electrode data source path end of the USB multiplexer (U2) are used as a third USB transmission signal input end of the USB switching circuit (102) and a third composite signal output end of the USB switching circuit (102) together, and are connected with a third main device so as to be connected with a third USB transmission signal and output the composite signal;

the fourth positive electrode data source path end of the USB multiplexer (U2) and the fourth negative electrode data source path end of the USB multiplexer (U2) are used as a fourth USB transmission signal input end of the USB switching circuit (102) and a composite signal fourth output end of the USB switching circuit (102) together, and are connected with a fourth main device so as to be connected with a fourth USB transmission signal and output the composite signal;

the positive data public end of the USB multiplexer (U2) and the negative data public end of the USB multiplexer (U2) are used as a target USB transmission signal output end of the USB switching circuit (102) and a composite signal input end of the USB switching circuit (102) together and are connected with the hub circuit (104) so as to output the target USB transmission signal and access the composite signal;

the ground terminal of the USB multiplexer (U2) and the enabling control input terminal of the USB multiplexer (U2) are commonly connected to the power ground.

In one embodiment, the video switching circuit (103) includes a retiming switch (U3), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), and a second capacitor (C2);

the video switching circuit (103) comprises a second selection signal input end, a plurality of video signal input ends and a target video signal output end;

a second selection signal input end of the video switching circuit (103) is connected with the control circuit (101) so as to be connected with the second selection signal; a plurality of video signal input terminals of the video switching circuit (103) input a plurality of the video signals; a target video signal output end of the video switching circuit (103) is connected with the control circuit (101) so as to output the target video signal;

the second selection signal input end comprises a chip programming serial programming clock end of the retiming switch (U3) and a chip programming serial programming data end of the retiming switch (U3);

the serial programming device address selection end of the retiming switch (U3) is connected with the first end of the fifth resistor (R5), and the second end of the fifth resistor (R5) is connected with the power ground;

the interrupt output end of the re-timing switch (U3), the first end of the sixth resistor (R6) and the first end of the seventh resistor (R7) are connected, the second end of the sixth resistor (R6) is connected with a third power supply, and the second end of the seventh resistor (R7) is connected with the power supply ground;

the hardware reset pin end of the re-timing switch (U3) is connected with the first end of the second capacitor (C2) and the first end of the eighth resistor (R8), the second end of the eighth resistor (R8) is connected with the third power supply, and the second end of the second capacitor (C2) is connected with the power supply ground;

the video signal input comprises four pairs of differential inputs of the retiming switch (U3);

the target video signal output comprises four pairs of differential outputs of the retiming switch (U3).

In one embodiment, the hub circuit (104) includes a USB hub.

The utility model also provides an interactive large screen, which comprises the multi-video-source switching circuit (100).

In one embodiment, the interactive large screen further comprises a touch device (200);

the touch control equipment (200) is connected with the line concentration circuit (104) and is configured to output the USB receiving signal according to the sensed operation instruction and perform corresponding actions according to the accessed target USB sending signal.

In one embodiment, the interactive large screen further comprises a USB expansion device (300);

-the USB extension device (300) is configured to output the USB reception signal;

the hub circuit (104) is specifically configured to access a plurality of the USB reception signals, perform time-division multiplexing on the plurality of USB reception signals to output a composite signal, and transfer a target USB transmission signal to the touch device and/or the USB extension device (300).

In one embodiment, the interactive large screen further comprises a display circuit (400);

the display circuit (400) is configured to play in accordance with the video play signal.

In one embodiment, the interactive large screen further comprises a plurality of master devices;

the master device is configured to output the USB transmit signal and the video signal;

the USB switching circuit (102) is configured to access a plurality of USB transmission signals, select the target USB transmission signal output of the USB transmission signals according to the first selection signal, and transfer the composite signal to a target master device of the master devices;

wherein the target host device is configured to output the target USB transmit signal and the target video signal.

In the embodiment of the utility model, the hub circuit (104) performs time-sharing multiplexing on a plurality of accessed USB receiving signals to output a composite signal; a control circuit (101) outputs a first selection signal and a second selection signal according to the composite signal; the USB switching circuit (102) is connected with a plurality of USB transmission signals, selects a target USB transmission signal out of the plurality of USB transmission signals to output according to the first selection signal, and converts the target USB transmission signal into a composite signal; a video switching circuit (103) is connected with a plurality of video signals, and selects a target video signal in the plurality of video signals to output according to a second selection signal; a control circuit (101) converts a target video signal into a video play signal; the switching of different main equipment is convenient and smooth when a plurality of persons cooperatively operate; all the devices are connected through hardware interfaces, so that the stability is extremely high, and the devices are not influenced by the network environment.

Drawings

In order to more clearly illustrate the technical utility model in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it will be apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a block diagram of a multi-video source switching circuit according to an embodiment of the present utility model;

FIG. 2 is a circuit diagram of a portion of an exemplary multi-video source switching circuit according to one embodiment of the present utility model;

FIG. 3 is a circuit diagram of another portion of an exemplary multi-video source switching circuit according to one embodiment of the present utility model;

FIG. 4 is a circuit diagram of another portion of an exemplary multi-video source switching circuit according to one embodiment of the present utility model;

FIG. 5 is a circuit diagram of another portion of an exemplary multi-video source switching circuit according to one embodiment of the present utility model;

FIG. 6 is a circuit diagram of another portion of an exemplary multi-video source switching circuit according to one embodiment of the present utility model;

fig. 7 is a circuit diagram illustrating another portion of an exemplary multi-video source switching circuit according to an embodiment of the present utility model.

FIG. 8 is a block diagram of another embodiment of a multi-video source switching circuit according to the present utility model;

FIG. 9 is a block diagram of another embodiment of a multi-video source switching circuit according to the present utility model;

FIG. 10 is a block diagram of another embodiment of a multi-video source switching circuit according to the present utility model;

fig. 11 is a block diagram of another embodiment of a multi-video source switching circuit according to the present utility model.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Fig. 1 shows a block structure of a multi-video source switching circuit 100 according to an embodiment of the present utility model, and for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:

as shown in fig. 1, the multi-video source switching circuit 100 includes a control circuit 101, a USB switching circuit 102, a video switching circuit 103, and a hub circuit 104;

the hub circuit 104 is connected with the control circuit 101 and the USB switching circuit 102, and the control circuit 101 is also connected with the USB switching circuit 102 and the video switching circuit 103;

the hub circuit 104 is configured to access a plurality of USB reception signals, and time-division multiplex the plurality of USB reception signals to output a composite signal;

the USB switching circuit 102 is configured to transfer the composite signal to the control circuit 101;

the control circuit 101 is configured to output a first selection signal and a second selection signal according to the composite signal;

the USB switch circuit 102 is configured to access the plurality of USB transmit signals, and select a target USB transmit signal output of the plurality of USB transmit signals based on the first select signal,

hub circuit 104 is also configured to transfer the target USB transmit signal;

the video switching circuit 103 is configured to access the plurality of video signals and select a target video signal out of the plurality of video signals to output according to the second selection signal; the control circuit 101 is further configured to convert the target video signal into a video play signal.

One of the USB reception signal and the composite signal carries channel selection information, and the control circuit 101 is specifically configured to output a first selection signal and a second selection signal according to the channel selection information.

Fig. 2 shows a partial example circuit structure of the multi-video source switching circuit 100 provided by the embodiment of the present utility model, fig. 3 shows another partial example circuit structure of the multi-video source switching circuit 100 provided by the embodiment of the present utility model, fig. 4 shows another partial example circuit structure of the multi-video source switching circuit 100 provided by the embodiment of the present utility model, fig. 5 shows another partial example circuit structure of the multi-video source switching circuit 100 provided by the embodiment of the present utility model, fig. 6 shows another partial example circuit structure of the multi-video source switching circuit 100 provided by the embodiment of the present utility model, fig. 7 shows another partial example circuit structure of the multi-video source switching circuit 100 provided by the embodiment of the present utility model, and for convenience of explanation, only the portions related to the embodiment of the present utility model are shown in detail as follows:

in one embodiment of the present utility model, the control circuit 101 includes a first microprocessor U1, a first resistor R1, and a second resistor R2.

The control circuit 101 includes a multiplexing signal input terminal, a target video signal input terminal, a video play signal output terminal, a first selection signal output terminal, and a second selection signal output terminal; the multiplexing signal input end of the control circuit 101 is connected with the hub circuit 104 to access the multiplexing signal; a target video signal input terminal of the control circuit 101 is connected to the video switching circuit 103 to access a target video signal; the video playing signal output end of the control circuit 101 outputs a video playing signal; a first selection signal output terminal of the control circuit 101 is connected to the USB switching circuit 102 to output a first selection signal; a second selection signal output terminal of the control circuit 101 is connected to the video switching circuit 103 to output a second selection signal.

As shown in fig. 2, the multiplexing signal input terminal includes a set of USB OTG negative data input terminals usb_a_otg_dm of the first microprocessor U1 and a set of USB OTG positive data input terminals usb_a_otg_dp of the first microprocessor U1.

As shown in fig. 3, the first selection signal output terminal includes a first general purpose input output terminal gpioz_10 of the first microprocessor U1 and a second general purpose input output terminal gpioz_11 of the first microprocessor U1.

As shown in fig. 4, the first end of the first resistor R1, the first end of the second resistor R2, the i2c serial clock end i2cm_e_scl of the first microprocessor U1, and the i2c serial data end i2cm_e_sda of the first microprocessor U1 are used together as the second selection signal output end of the control circuit 101. The second end of the first resistor R1 and the second end of the second resistor R2 are commonly connected to the first power supply VDDIO.

As shown in fig. 5, the target video signal inputs include four pairs of differential inputs of the first microprocessor U1.

The target video signal input end specifically includes a B-group high-definition multimedia interface High Definition Multimedia Interface of the first microprocessor U1, an HDMI minimum transmission differential signal transmission-minimized differential signaling, a TMDS clock channel negative electrode receiving end hdmirx_c_clkn, a B-group HDMI TMDS clock channel positive electrode receiving end hdmirx_c_clkp of the first microprocessor U1, a B-group HDMI TMDS negative electrode data receiving end hdmirx_c_d0n of the first microprocessor U1, a B-group HDMI TMDS positive electrode data receiving end hdmirx_c_d0p of the first microprocessor U1, a B-group HDMI TMDS negative electrode data receiving end hdmirx_cjd1n of the first microprocessor U1, a B-group TMDS positive electrode data receiving end hdmirx_c2n of the first microprocessor U1, and a B-group HDMI TMDS positive electrode data receiving end hdmirx_c2n of the first microprocessor U1.

As shown in fig. 6, the video playback signal output terminals include eight pairs of differential output terminals of the first microprocessor U1.

Wherein, the liquid crystal display device comprises a liquid crystal display device, the video playing signal output end specifically comprises a B group V-by-one negative clock output end LVDS_B_CLKN of the first microprocessor U1, a B group V-by-one positive clock output end LVDS_B_CLKP of the first microprocessor U1, a B group V-by-one 1 st channel negative data output end LVDS_B_3N of the first microprocessor U1, a B group V-by-one 1 st channel positive data output end LVDS_B_3P of the first microprocessor U1, a B group V-by-one 2 nd channel negative data output end LVDS_C_ON of the LVDS of the first microprocessor U1, a B group V-by-one 2 nd channel positive data output end LVDS_C_OP of the first microprocessor U1 the group B V-by-one 3 rd channel anode data output end LVDS_C_1N comprising the first microprocessor U1, the group B V-by-one 3 rd channel anode data output end LVDS_C_1P comprising the first microprocessor U1, the group B V-by-one 4 th channel anode data output end LVDS_C_2N comprising the first microprocessor U1, the group B V-by-one 4 th channel anode data output end LVDS_C_2P comprising the first microprocessor U1, the group B V-by-one 5 th channel anode data output end LVDS_C_CLKN comprising the first microprocessor U1, the group B V-by-one 5 th channel anode data output end LVDS_C_CLKP comprising the first microprocessor U1, the group B V-by-one 6 th channel anode data output end LVDS_C_3N comprising the first microprocessor U1, the group B V-by-one 6 th channel anode data output end LVDS_C_2P comprising the first microprocessor U1, the system comprises a B group V-by-one 6 th channel positive electrode data output end LVDS_C_3P comprising a first microprocessor U1, a B group V-by-one 7 th channel negative electrode data output end Vx1_B_7N comprising the first microprocessor U1, and a B group V-by-one 7 th channel positive electrode data output end Vx1_B_7P comprising the first microprocessor U1.

The first microprocessor U1 integrated with the video switching function is adopted as a control module, so that a circuit is simplified.

As shown in fig. 3, the USB switching circuit 102 includes a USB multiplexer U2, a third resistor R3, a fourth resistor R4, and a first capacitor C1.

The power supply end Vcc of the USB multiplexer U2, the first end of the first capacitor C1, the first end of the second capacitor C2, the first end of the third resistor R3, and the first end of the fourth resistor R4 are commonly connected to the second power supply VAA; the second terminal of the first capacitor C1 is connected to the power ground.

The first path selection control input terminal SEL1 of the USB multiplexer U2 is connected to the second terminal of the third resistor R3; the second path selection control input terminal SEL0 of the USB multiplexer U2 is connected to the second terminal of the fourth resistor R4; the first path selection control input terminal SEL1 of the USB multiplexer U2, the second terminal of the third resistor R3, the second path selection control input terminal SEL0 of the USB multiplexer U2, and the second terminal of the fourth resistor R4 are used together as the first selection signal input terminal of the USB switching circuit 102, and are connected to the control circuit 101 to access the first selection signal.

The first positive data source path hsd0+ of the USB multiplexer U2 and the first negative data source path HSD 0-of the USB multiplexer U2 are used together as the first USB transmit signal input of the USB switch circuit 102 and the first composite signal output of the USB switch circuit 102, and are connected to the first host device to access the first USB transmit signal and output the composite signal.

The second positive data source path hsd1+ of the USB multiplexer U2 and the second negative data source path HSD 1-of the USB multiplexer U2 are used together as the second USB transmit signal input of the USB switch circuit 102 and the second composite signal output of the USB switch circuit 102, and are connected to the second host device to access the second USB transmit signal and output the composite signal.

The third positive data source path hsd2+ of the USB multiplexer U2 and the third negative data source path HSD2 of the USB multiplexer U2 are used together as the third USB transmit signal input of the USB switch circuit 102 and the third output of the composite signal of the USB switch circuit 102, and are connected to the third host device to access the third USB transmit signal and output the composite signal.

The fourth positive data source path hsd3+ of the USB multiplexer U2 and the fourth negative data source path HSD 3-of the USB multiplexer U2 are used together as the fourth USB transmit signal input of the USB switch circuit 102 and the fourth output of the composite signal of the USB switch circuit 102, and are connected to the fourth host device to access the fourth USB transmit signal and output the composite signal.

The positive data common terminal d+ of the USB multiplexer U2 and the negative data common terminal D-of the USB multiplexer U2 are used together as a target USB transmit signal output terminal of the USB switching circuit 102 and a composite signal input terminal of the switching circuit, and are connected to the hub circuit 104 to output a target USB transmit signal and access the composite signal.

The ground GND of the USB multiplexer U2 and the enable control input/OE of the USB multiplexer U2 are commonly connected to the power ground.

It should be noted that, a current limiting resistor is connected between the USB multiplexer U2 and the first microprocessor U1 to limit the current, so as to reduce the risk of chip burnout.

As shown in fig. 4, the video switching circuit 103 includes a re-timing switch U3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a second capacitor C2;

the video switching circuit 103 includes a second selection signal input terminal, a plurality of video signal input terminals, and a target video signal output terminal.

A second selection signal input terminal of the video switching circuit 103 is connected with the control circuit 101 to access a second selection signal; a plurality of video signals are input to a plurality of video signal input terminals of the video switching circuit 103; the target video signal output terminal of the video switching circuit 103 is connected to the control circuit 101 to output a target video signal.

The second selection signal input terminal comprises a chip programming serial programming clock terminal PCSCL of the retiming switch U3 and a chip programming serial programming data terminal PCSDA of the retiming switch U3.

The serial programming device address select terminal PCADR of the retiming switch U3 is coupled to a first terminal of a fifth resistor R5, and a second terminal of the fifth resistor R5 is coupled to power ground.

The interrupt output terminal int#, the first terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7 of the retiming switch U3 are connected, the second terminal of the sixth resistor R6 is connected to the third power supply VCC, and the second terminal of the seventh resistor R7 is connected to the power supply ground.

The hardware reset pin terminal SYSRSTN of the retiming switch U3 is connected to the first terminal of the second capacitor C2 and the first terminal of the eighth resistor R8, and the second terminal of the eighth resistor R8 is connected to the third power supply VCC and the second terminal of the second capacitor C2 is connected to the power supply ground.

The video signal input comprises four pairs of differential inputs of the retiming switch U3.

As shown in fig. 7, as an example and not by way of limitation, one video signal input terminal specifically includes a 0 th HDMI clock channel negative receiving terminal P0RXCN of the retiming switch U3, a 0 th HDMI clock channel positive receiving terminal P0RXCP of the retiming switch U3, a port 0 th HDMI channel negative receiving terminal P0RX0N of the retiming switch U3, a 0 th HDMI channel positive receiving terminal P0RX0P of the retiming switch U3, a port 0 th HDMI channel negative receiving terminal P0RX1N of the retiming switch U3, a 0 th HDMI channel positive receiving terminal P0RX1P of the retiming switch U3, a port 0 th HDMI channel 2 negative receiving terminal P00RX2N of the retiming switch U3, and a 0 th HDMI channel 2 receiving terminal P0RX2P of the retiming switch U3.

The target video signal output terminal includes four pairs of differential output terminals of the retiming switch U3.

As shown in fig. 5, the video signal output end specifically includes an HDMI negative clock transmitting end TXCM of the retiming switch U3, an HDMI positive clock transmitting end TXCP of the retiming switch U3, an HDMI 0 th channel negative data transmitting end TX0M of the retiming switch U3, an HDMI 0 th channel positive data transmitting end TX0P of the retiming switch U3, an HDMI 1 st channel negative data transmitting end TX1M of the retiming switch U3, an HDMI 1 st channel positive data transmitting end TX1P of the retiming switch U3, an HDMI 2 nd channel negative data transmitting end TX2M of the retiming switch U3, and an HDMI 2 nd channel positive data transmitting end TX2P of the retiming switch U3.

The video switching circuit 103 is simple and reliable.

In one embodiment of the utility model, hub circuit 104 includes a USB hub.

The USB hub is used for expanding one USB interface into a plurality of USB interfaces and enabling the plurality of USB interfaces to be used simultaneously.

The utility model also provides an interactive large screen comprising the multi-video source switching circuit 100.

In one embodiment of the present utility model, as shown in fig. 8, the interactive large screen further includes a touch device 200.

The touch device 200 is connected to the hub circuit 104, and is configured to output a USB reception signal according to the sensed operation instruction, and perform a corresponding action according to the accessed target USB transmission signal.

The touch device 200 outputs USB receiving signals according to the sensed operation instructions, so that the hub circuit 104 performs time-sharing multiplexing on the plurality of USB receiving signals to output composite signals, and the USB switching circuit 102 switches the composite signals to the control circuit 101; the control circuit 101 outputs a first selection signal and a second selection signal according to the composite signal to perform selection of a target USB transmission signal and a target video signal; the switching control of multiple video sources and multiple USB transmission signals can be realized by the touch device 200.

As shown in fig. 9, the interactive large screen further includes a USB expansion device 300.

The USB extension device 300 is configured to output a USB reception signal.

The hub circuit 104 is specifically configured to access the plurality of USB received signals, time-division multiplex the plurality of USB received signals to output a composite signal, and transfer the target USB transmission signal to the touch device and/or the USB extension device 300.

Wherein the USB extension device 300 is one or more. In a specific embodiment, the USB extension device 300 may be a large-screen built-in USB device, such as a camera, and a large-screen external device, such as a USB disk.

By the time-sharing multiplexing function of the hub circuit 104, the touch circuit 200 and the USB extension device 300 can control the multi-video source switching circuit 100 without frequently plugging the USB extension device 300.

As shown in fig. 10, the interactive large screen further includes a display circuit 400.

The display circuit 400 is configured to play according to the video play signal.

The display circuit 400 is capable of accessing different video source signals and displaying corresponding video input sources.

As shown in fig. 11, the interactive large screen further includes a plurality of host devices 5001 to 500n.

The master device outputs a USB transmission signal and a video signal.

The USB switching circuit 102 accesses the plurality of USB transmission signals, selects a target USB transmission signal out of the plurality of USB transmission signals according to the first selection signal, outputs the selected target USB transmission signal, and transfers the composite signal to a target master device out of the plurality of master devices.

Wherein the target host device is configured to output a target USB transmit signal and a target video signal.

In a specific embodiment, the target host outputs a target USB transmission signal and a target video signal, the USB switching circuit 102 selects to output the target USB transmission signal to the hub circuit 104 according to the first selection signal, the video switching circuit 103 selects to output the target video signal according to the second selection signal, and the switching circuit 102 accesses the composite signal to the target host according to the first selection signal, so as to realize that one host device (target host device) of the multiple host devices is selected by the touch circuit 200 to communicate with the multiple video source switching circuit 100.

In the embodiment of the present utility model, the hub circuit 104 performs time-division multiplexing on the accessed multiple USB receiving signals to output a composite signal; the control circuit 101 outputs a first selection signal and a second selection signal according to the composite signal; the USB switching circuit 102 is connected with a plurality of USB transmission signals, selects a target USB transmission signal out of the plurality of USB transmission signals to output according to the first selection signal, and converts the composite signal; the video switching circuit 103 is connected with a plurality of video signals, and selects a target video signal in the plurality of video signals to output according to the second selection signal; the control circuit 101 converts the target video signal into a video play signal; the switching of different main equipment is convenient and smooth when a plurality of persons cooperatively operate; all the devices are connected through hardware interfaces, so that the stability is extremely high, and the devices are not influenced by the network environment.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.

Claims

1. A multi-video source switching circuit, wherein the multi-video source switching circuit (100) comprises a control circuit (101), a USB switching circuit (102), a video switching circuit (103) and a hub circuit (104);

2. The multi-video source switching circuit of claim 1 wherein the control circuit (101) comprises a first microprocessor (U1), a first resistor (R1), and a second resistor (R2);

the multiplexing signal input end comprises a group of USB OTG negative electrode data input ends of the first microprocessor (U1) and a group of USB OTG positive electrode data input ends of the first microprocessor (U1);

3. The multi-video source switching circuit of claim 1 wherein the USB switching circuit (102) comprises a USB multiplexer (U2), a third resistor (R3), a fourth resistor (R4), and a first capacitor (C1);

a first path selection control input of the USB multiplexer (U2) is connected to a second end of the third resistor (R3); a second routing control input of the USB multiplexer (U2) is connected to a second end of the fourth resistor (R4); -a first routing control input of the USB multiplexer (U2), a second end of the third resistor (R3), a second routing control of the USB multiplexer (U2) and a second end of the fourth resistor (R4) and a first selection signal input jointly being the USB switching circuit (102), are connected to the control circuit (101) for accessing the first selection signal;

4. The multi-video source switching circuit of claim 1 wherein the video switching circuit (103) comprises a retiming switch (U3), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), and a second capacitor (C2);

5. The multiple video source switching circuit of claim 1 wherein the hub circuit (104) comprises a USB hub.

6. An interactive large screen comprising the multi-video source switching circuit (100) of any one of claims 1 to 5.

7. The interactive large screen of claim 6, further comprising a touch device (200);

8. The interactive large screen of claim 7, further comprising a USB expansion device (300);

the hub circuit is specifically configured to access a plurality of the USB reception signals, time-division multiplex the plurality of the USB reception signals to output a composite signal, and transfer a target USB transmission signal to the touch device (200) and/or the USB extension device (300).

9. The interactive large screen of claim 7, further comprising a display circuit (400);

10. The interactive large screen of claim 6, wherein the interactive large screen further comprises a plurality of host devices;