TWI697206B - Multimedia controlling adapter and method for recognizing thereof and a video matrix device using the same - Google Patents

Abstract

The present invention provides a multimedia controlling adapter and controlling method thereof, in which a switching circuit is driven to convert a controlling signal from a first level to a second level, and then output the converted controlling signal from a multimedia interface to a multimedia device, then, the multimedia interface receives a first response signal corresponding to the converted controlling signal, and finally, determining a connection status of the multimedia interface according to the first response signal. In one embodiment, the multimedia controlling adapter and the controlling method thereof can be utilized in a switching device, such as a video matrix, for example.

Description

Multimedia control card and its identification method and image array device

The invention is a technology for identifying multimedia input or output devices, in particular to a multimedia control card and its identification method and image array device that can automatically identify a multimedia input device or an output device and provide a misconnected message to prompt the user.

Please refer to FIG. 1A and FIG. 1B, which is a schematic diagram of a conventional multi-port multimedia switching device. The conventional multimedia switching device usually has multiple input ports and multiple output ports, each input port is used to couple with a multimedia signal input device (such as a DVD player or a computer, etc.), and each output port is used to connect with multimedia The signal output device (for example: flat display or projector) is coupled.

Generally speaking, in this type of multi-port multi-media switching device, each port interface is pre-defined as an input port or an output port during design. For example, the upper ports in FIG. 1A are defined as input ports 100, and the lower ports in FIG. 1A are defined as output ports 101; or, the left half of FIG. 1B is defined as output ports 102, Each interface in the right half of FIG. 1B is defined as the input port 103.

As shown in FIG. 2, the figure is a schematic diagram of the HDMI transmission protocol. When the multimedia signal input device (for example: computer or DVD player) is connected to the multimedia signal output device (for example: TV, projector and other display devices), it will communicate according to the HDMI communication protocol, and the process is multimedia signal input The device sends a 5V Vcc signal to the multimedia signal output device, and then the multimedia signal output device adjusts the signal level of the hot plug detection (HPD) channel to the HIGH level, and then the multimedia signal input device passes the display information channel (display data channel (DDC) requests EDID information from the multimedia signal output device. After the multimedia signal output device responds to the multimedia signal input device EDID information, the multimedia signal input device outputs the TMDS signal to the multimedia signal output device through the TMDS channel, and then displays the corresponding image and audio.

In the process of the above HDMI transmission protocol, there is no mechanism for the user to recognize whether there is a wrong multimedia signal input or output device. Therefore, when using a multi-port multimedia switching device, if a multimedia signal input device is encountered Or the output device is connected to the opposite port, that is, the multimedia signal output device is connected to the input port, or the multimedia signal input device is connected to the output port, the user cannot know in real time at the first point in time . Therefore, when a multi-port multimedia switching device connects many multi-media signal input devices and multi-media signal input devices, once the problem of connecting to the opposite port occurs, users often need to spend a lot of time to clarify Whether each port has the wrong connection problem.

In view of the above, there is a need for a multimedia control card and its identification method and image array device to solve the problems caused by conventional technologies.

The invention provides a multimedia control card and its identification method and image array device, which can detect the response of the external device to determine whether the external device is correctly or erroneously connected or not connected, reducing user debugging and correcting the connection The time required for errors improves ease of use.

In one embodiment, the present invention provides a method for identifying a multimedia control card, which includes the following steps. First, a switch circuit is used to drive a control signal from a first level to a second level. Then, the control signal is output through the multimedia interface. Then, the first response signal is detected by the multimedia interface, and the first response signal corresponds to the control signal. Finally, the connection status of the multimedia interface is identified according to the first response signal.

In another embodiment, the present invention provides a multimedia control card that has a signal receiving function or a signal output function. The multimedia control card includes a multimedia interface, a switch circuit, and a controller. The switch circuit is connected to the multimedia interface, the switch circuit drives the control signal from the first level to the second level, and outputs the control signal through the multimedia interface. The switch circuit receives the first response signal received from the multimedia interface. The first response signal corresponds to the control signal of the second level. The controller is connected to the switch circuit, and the controller recognizes the connection state of the multimedia interface according to the first response signal.

In another embodiment, the present invention provides an image array device including a switching unit and at least one multimedia control card. At least one multimedia control card is electrically connected to the switching unit, and each multimedia control card includes a multimedia interface, a switch circuit, and a controller. The switch circuit is connected to the multimedia interface, changes the control signal from the first level to the second level, and outputs the control signal through the multimedia interface, receiving the first response signal received by the multimedia interface, the first response signal corresponds to the control signal . The controller is connected to the switch circuit and recognizes the connection state of the multimedia interface according to the first response signal.

In one embodiment, the present invention uses hot plug detect (HPD) as the control signal, breaking the traditional way, so that the control card belonging to the multimedia signal input can also generate HPD signals, and use the control card to connect The communication protocol of the port uses the signals in a specific communication channel, such as the display data channel (DDC) and the differential signal channel (TMDS), to determine the connection status of the control card. In this way, the use of additional components or circuits can be reduced, and the effect of judging whether it is wrongly connected can be achieved.

Hereinafter, referring to the accompanying drawings, various exemplary embodiments may be more fully described, and some exemplary embodiments are shown in the accompanying drawings. However, the inventive concept may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, the provision of these exemplary embodiments makes the invention detailed and complete, and will fully convey the scope of the inventive concept to those skilled in the art. Similar numbers always indicate similar components. The following will describe the multimedia control card, its identification method, and image array device with various embodiments and drawings, however, the following embodiments are not intended to limit the present invention.

Please refer to FIG. 3A, which is a schematic diagram of an embodiment of the multimedia control card of the present invention. In this embodiment, the multimedia control card 2 is made into an interface card structure, which has a first multimedia interface 20 and a second multimedia interface 21. The first multimedia interface 20 may be an interface type of HDMI, DVI, or DisplayPort, and is used to electrically connect with the application device 91. In this embodiment, the first multimedia interface 20 is electrically connected to the application device 91 through the signal line 90. The second multimedia interface 21 can be connected to a switching device through a cable or other signal transmission media, such as a crosspoint switch in an array switch, but it is not limited thereto. It should be noted that, in an embodiment, the port type of the first multimedia interface 20 conforms to the port type specified by the HDMI, DVI, or DisplayPort protocol; and the second multimedia interface 21 In addition to the aforementioned methods of conforming to various communication protocols, the port type can also be used to encode/decode packet data formed by users themselves. It should be noted that the type of port can be determined according to user needs, and there are no restrictions.

In an embodiment, the application device 91 may be a multimedia signal input source, such as a computer, a player, and other devices. Or, in another embodiment, the application device 91 may also be a multimedia signal output device, such as a display device such as a liquid crystal display, a light-emitting diode display, or a projector.

The multimedia control card 2 further has a switch circuit 22 and a controller 23. The switch circuit 22 is electrically connected to the first multimedia interface 20 and the controller 23. As shown in FIG. 3B, it is a schematic diagram of an embodiment of the switch circuit of the present invention. The switch circuit 22 includes a switch circuit 220 and a detection circuit 221. The switch circuit 220 is used to receive the input signal and convert it into a corresponding switch signal. In one embodiment, the input signal may be a display data channel signal (DDC) signal, and the switch signal may be a voltage level signal. In one embodiment, the voltage level signal is a TTL voltage level. After receiving the switch signal, the detection circuit 221 determines the level of the switch signal, and inputs the first signal level to the controller 23. In one embodiment, the switch circuit 22 may be a power supply voltage monitor (voltage monitor), such as TPS3823 manufactured by Texas Instruments. The operation mode will be described in detail later. The multimedia control card 2 further has a comparator 24, which can receive the signal returned from the application device 91, determine its level, and then return the result of the determination to the controller 23.

Please refer to FIGS. 3A-3B and FIG. 4 at the same time. FIG. 4 is a schematic diagram of a multimedia control card identification method of the present invention. Generally speaking, in an embodiment, the multimedia control card 2 may be a control card that fixedly receives a multimedia signal input source, or a control card that permanently outputs a multimedia signal to a multimedia signal output device, as shown in FIG. 3A. In another embodiment, as shown in FIG. 5, the multimedia control card may be a control card 2a having both of the foregoing functions, and the user sets the card as an input control card or an output control card through the user. Regardless of the aforementioned control card, the user may often connect the wrong device to the multimedia control card due to lack of attention. For example, connect the application device belonging to the image source to the control card belonging to the multimedia signal output, or connect the application device belonging to the display to the control card belonging to the multimedia signal input. It should be noted that in the embodiment of the control card in FIG. 5, this type of multimedia control card 2a will have a mode switch 25 inside, which can be changed by the controller 23 through hardware setting or software setting. Operation mode, for example: setting the control card as the signal input control card or the signal output control card. In order to automatically determine whether the user has made a wrong connection, through the method of the embodiment of FIG. 4, it can be determined whether the application device 91 connected to the multimedia control card 2 or 2a is a multimedia signal input source or a multimedia signal output device to avoid misconnection Happening.

In step 30 of method 3 in FIG. 4, the user arbitrarily connects the application device to the multimedia control card 2. It should be noted that the user does not intentionally distinguish whether the application device is a multimedia signal input source or a multimedia signal output device. However, the application device 91 is arbitrarily connected to the multimedia control card 2. Then in step 31, the drive switch circuit 22 changes the control signal from the first level to the second level, and outputs the control signal to the application device 91 through the first multimedia interface 20. In an embodiment of this step, the control signal is a hot plug detection (HPD) signal, which is generated by the controller 23, but is not limited thereto. The HPD signal has two levels, the first level is LOW, and the second level is HIGH. In one embodiment, the control signal has a low level when it enters the switch circuit 22, and the switch circuit 22 adjusts the low level to a high level state, and then transmits it to the signal line 90 through the first multimedia interface 20 Application device 91. In another embodiment, the controller 23 may directly generate a high-level control signal, and then transmit it to the application device 91 through the first multimedia interface 20 and the signal line 90.

It should be noted that the pin of the first multimedia interface 20 transmitting the HPD signal depends on the type of interface. If it is an HDMI signal, the 19th pin is the pin for HPD signal transmission. If it is a DVI signal, the pin Pin 16 is used as the pin for HPD signal transmission. If it is a DisplayPort signal, pin 18 is used as the pin for HPD signal transmission. It should be noted that the signals corresponding to the pin positions of various signal protocols are well known to those skilled in the art, and will not be repeated here.

In an embodiment in which the signal level is changed in step 31, as shown in FIG. 3A, a switching signal CTRL1 is generated by the controller 23 to the switch circuit 22, so that it includes the power supply Vcc, the resistance R and the control switch of the switch The element 222 switches to the position 222a so that Vcc pulls the control signal to the second level (HIGH). When the switching signal CTRL1 switches the control switching element 222 to the position 222b, the control signal returns to the first level (LOW). With the above embodiment, the level of the control signal can be changed. It should be noted that the manner of controlling the high and low levels can be changed by those skilled in the art according to the prior art and its knowledge, and is not limited by the embodiments of the present invention.

After the control signal is pulled to the second level (HIGH), step 32 transmits the control signal of the second level to the application device 91 through the first multimedia interface 20 and the transmission line 90. Then, in step 33, after the application device 91 receives the second level control signal, the application device 91 generates a corresponding first response signal and returns it to the multimedia control card 2 via the signal line 90. In one embodiment, the first response signal is a signal that displays a data channel signal (DDC). Generally speaking, in the HDMI communication protocol, the 15th pin is responsible for transmitting the DDC clock signal (DDC CLK or I2C serial clock signal), and the 16th pin is responsible for transmitting the DDC data signal (DDC data or I2C Serial data signal). In this embodiment, the first reaction signal can be selected as the clock signal of the DDC.

In another embodiment, if it is a DVI signal, generally pin 6 is responsible for transmitting the DDC clock signal (DDC CLK), and pin 7 is responsible for transmitting the DDC data signal (DDC data). In another embodiment, if it is a DisplayPort signal, the auxiliary channel (AUX) of the 15th and 17th pins is used to transmit the clock and data of the DDC. Therefore, although this embodiment is mainly described with HDMI signals, DVI or DisplayPort, as well as other types of signals, can be implemented according to this spirit.

Next, in step 34, the first multimedia interface 20 detects the first response signal corresponding to the control signal. Then in step 35, the controller 23 determines the connection status of the first multimedia interface 20 according to the first response signal, wherein the connection status includes whether the first multimedia interface 20 is in an unconnected state, or the first The application device 91 connected to the media interface 20 belongs to a multimedia signal input source (or source) or a multimedia signal output device (or sink).

Please refer to FIG. 6, which is a schematic flowchart of an embodiment of the present invention for identifying the connection status of the first multimedia interface. In this embodiment, please refer to FIG. 3A and FIG. 3B at the same time. First, in step 350, the switch circuit 22 receives the first reaction signal, and converts the first reaction signal to the first signal level. In step 350, the switch circuit 22 shown in FIGS. 3A and 3B is mainly used for signal processing and detection. In this embodiment, the switch circuit 22 includes a switch circuit 220 and a detection circuit 221. The switch circuit 220 is used to generate a corresponding switch signal according to the first response signal, and the detection circuit is used to detect whether the level of the switch signal is high or low, and output if the switch signal is high. The first level signal representing HIGH, otherwise the first level signal representing LOW is output.

In an embodiment, the switch circuit 220 and the detection circuit 221 are integrated into a circuit element, for example: the power supply voltage monitor of Texas Instruments, model: TPS3823, is an embodiment. As shown in FIG. 7, it is a schematic diagram of the TPS3823 which integrates the switching circuit and the detection circuit into one device, in which the MR pin is electrically connected to the pin of the first response signal (for example: DDC CLK signal), and the RST pin It is electrically connected to the controller 23. The RST pin is used to output the first signal level. In one embodiment, when the MR Pin level is HIGH, that is, when there is a DDC CLK signal, the RST level is also HIGH; otherwise, when it is LOW, that is, when there is no DDC CLK signal, the RST level is LOW .

After step 350, step 351 is performed to transmit the first signal level (HIGH or LOW) to the controller 23, and the controller 23 determines the application device 91 connected to the first multimedia interface 20 according to the first signal level Whether it belongs to a multimedia signal source (source) or a display device (sink), or the multimedia interface is not connected, that is, the multimedia signal source or display device is not connected. In step 351, when the first level signal 92 received by the controller 23 belongs to the LOW state, it means that the application device 91 connected to the first multimedia interface 20 is a multimedia signal input source (source end). The main reason is that, taking the HDMI communication protocol as an example, when the HPD signal is HIGH, if it is a multimedia signal output device (sink), it must respond to related display information through the DDC channel, for example: EDID information. In one embodiment, according to the foregoing, the DDC CLK of the DDC channel is used as the first response information. Therefore, if the application device 91 is a multimedia signal output device, the first response signal will have DDC CLK information, and then the switch The circuit 22 can output HIGH. On the contrary, if it is the state of the multimedia signal input source, there will be no information reply, so the output of the switch circuit 22 will be in the state of LOW. Based on the above communication protocol, the controller 23 can determine whether the connection status of the first multimedia interface 20 is connected to the multimedia signal input source according to the reply message.

When the first signal level of the first response signal received by the controller 23 is LOW, step 352 is performed, and the controller 23 determines that it is connected to the multimedia signal input source. Then, step 353 is performed to determine whether the multimedia interface 20 is connected by mistake according to the signal receiving function or signal output function corresponding to the multimedia control card 2. As mentioned above, each multimedia control card 2 can be a control card with a multimedia signal receiving function. Such a control card is used to electrically connect with a multimedia signal input source; it can also be a control card with a multimedia signal output function. Used for electrical connection with multimedia signal output devices, such as display devices. In addition, there is a multimedia control card with the function of switching settings, and it can be selected as the mode of multimedia signal output function or input function. Therefore, users can choose to switch any mode through hardware or software control.

In step 353, when the multimedia control card is in the input function mode, since the first signal level is LOW, the application device connected to it is a multimedia signal source device, such as a computer or a DVD player, etc. Represents the multimedia signal input source is correctly connected to the multimedia control card of the input function. On the contrary, if the multimedia control card is in the output function mode, since the first signal level is LOW, the application device 91 connected to it is the device of the multimedia signal input source, which means that the user mistakenly received the multimedia signal input source Multimedia control card with output function. In this case, the controller 23 will perform a step to activate the alert 354 and issue a corresponding alert message, such as a sound, light, voice, or text alert message.

Returning to step 351, when the first signal level of the first response signal received by the controller is HIGH, step 355 is performed to provide the voltage Vcc to the application device to further determine whether the first multimedia interface 20 is connected The multimedia signal output device is still not connected. Taking the HDMI communication specification as an example, it supplies voltage through the 18th pin. If the first multimedia interface 20 is an HDMI interface, the voltage of step 355 is provided to the application device 91 via the 18th pin. If the first multimedia interface 20 is a DVI interface, it will provide voltage to the application device through the 14th pin. If the first multimedia interface 20 is DisplayPort, the 20th pin is used to supply voltage. After the application device 91 receives the voltage signal, it will generate a corresponding second response signal. In this embodiment, the TMDS signal is used as the second response signal. The more regular TMDS signal is the TMDS clock signal. Therefore, in one embodiment, the clock signal in the TMDS signal can be used as the second response signal. It should be noted that TMDS data signals (TMDS data) can also be implemented and are not limited to TMDS clock signals.

Next, in step 356, the controller 23 in the multimedia control card 2 receives the second response signal generated from the application device 91 through the first multimedia interface 20 and makes a judgment. Referring to FIG. 3A, the signal of the TMDS CLK pin in the second response signal returned will enter the comparator 24. The comparator 24 outputs the second signal level to the controller 23 according to the state of the TMDS CLK signal. Taking the HDMI signal as an example, through the HDMI standard specification, when there is a voltage signal VCC for the application device side, if the application device is a multimedia signal output device (or Sink side), the TMDS level on the multimedia signal output device side must be 3.3V. Therefore, through the comparator 24, the signal of the TMDS CLK pin can be judged, and the second level signal, which is the result of the processing of the comparator 24, is provided to the controller 23 to determine whether the currently connected application device 91 is What kind it belongs to.

After step 356, in step 357, the controller 23 makes a judgment based on the second level signal output from the comparator 24. When the level of the second level signal is HIGH, it represents that the second response signal is the TMDS CLK signal Therefore, it is determined in step 358 that the application device 91 electrically connected to the first multimedia interface 20 is a multimedia signal output device. Conversely, when the level of the second level signal is LOW, it means that there is no second response signal, so it is determined in step 359 that the first multimedia interface 20 is not connected to any device.

Regardless of whether it is after step 358 or step 359, it returns to step 353 to determine whether there is a misconnection. Taking step 358 to step 353 as an example, as described above, step 353 is mainly determined according to whether the multimedia control card 2 belongs to a multimedia signal reception control card or a multimedia signal output control card. For example, when the multimedia control card 2 is in the output function mode, since the second signal level is HIGH, the application device 91 connected to it is a multimedia signal output device, such as an LCD display, a plasma TV, or a projection device A display device such as that means the user correctly connects the multimedia signal output device to the multimedia control card with the output function. On the contrary, if the multimedia control card is in the input function mode, because the second signal level is HIGH, and the application device connected to it is a multimedia signal output device, it means that the user mistakenly connected the multimedia signal output device to the input function Multimedia control card. In this case, the controller 23 will perform a step to activate the alert 354 and issue a corresponding alert message, such as a sound, light, voice, or text alert message. Similarly, taking step 359 to step 353 as an example, when the level of the second response signal received by the controller 23 is LOW, the controller 23 determines that the first multimedia interface 20 is not connected to the application device 91 Therefore, in step 353, a warning message is used to remind the user that the multimedia signal interface 20 of the control card is not connected.

Please refer to FIG. 8, which is a schematic structural diagram of an embodiment of an image array device of the present invention. The image array device 4 includes an array switcher 40 and a plurality of multimedia control cards 2. In one embodiment, the array switch 40 is a contact switch, which can be a matrix contact combination, such as 4x4 (that is, 4 input ports and 4 output ports), 16x16 (that is, 16 input ports and 16 ports) Output port) or 32x32 (that is, 32 input ports and 32 output ports), etc., where the number of the contact combination is not particularly limited in the present invention. Each multimedia control card 2 may be a fixed signal source input control card or an output control card as shown in FIG. 3A. Or the multimedia control card 2a which can switch the settings as shown in FIG.

In one embodiment, the image array device 4 can be set or controlled by the near-end computer 41. In another embodiment, the image array device 4 can be set or controlled by the remote computer 42 via the network 43. The first multimedia interface 20 (which can be HDMI, DVI, or DisplayPort interface) of each multimedia control card 2 or 2a is used to electrically connect to a multimedia signal input source (such as a computer or a DVD player), in addition The first multimedia interface 20 can also be used to electrically connect with multimedia signal output devices (such as TVs or display devices such as projectors). The multimedia control card 2 or 2a is electrically connected to the array switcher 40 through the second multimedia interface 21, so that the array switcher 4 can control any one of them as a multimedia signal receiving control card and any one as a multimedia signal output control through control pairing Card pairing, so that the multimedia signal received from the multimedia signal input source 91b or 91c received by the control card of the multimedia signal receiving function is transmitted to the control card serving as the multimedia signal output function through the array switcher 40, and then output to the multimedia signal output device 91a Or 91d.

Since the image array device 4 has a plurality of multimedia control cards 2 or 2a, it has a plurality of first multimedia interfaces 20 for connecting with a multimedia signal input source or a multimedia signal output device, so users often have a connection Misconnection occurs. The image array device of this embodiment uses the multimedia control card of FIG. 3A or FIG. 5, and the processes shown in FIG. 4 and FIG. 6, so when there is a wrong connection, the user can be warned of the wrong connection. Message, allowing users to make corrections, reducing the time it takes for users to debug and correct connection errors, and improve ease of use.

The above descriptions only describe the preferred embodiments or examples of the technical means adopted by the present invention to solve the problem, and are not intended to limit the scope of the patent implementation of the present invention. That is, any changes and modifications that are consistent with the context of the patent application scope of the present invention or made in accordance with the patent scope of the present invention are covered by the patent scope of the present invention.

2. 2a: Multimedia control card

20: The first multimedia interface

21: The second multimedia interface

22: Switcher circuit

220: switch circuit

221: Detection circuit

222: control switching element

222a, 222b: location of tangent point

23: Controller

24: Comparator

25: Mode switcher

40: Array switcher

90: signal line

91: Application device

91a, 91d: Multimedia signal output device

91b, 91c: Multimedia signal input source

92: first level signal

3: Method

30~35: Step

350~359: steps

4: Image array device

40: Array switcher

41, 42: Computer

43: Internet

1A and 1B are schematic diagrams of a conventional multi-port multimedia switching device. Figure 2 is a schematic diagram of the HDMI transmission protocol. FIG. 3A is a schematic diagram of an embodiment of an embodiment of a multimedia control card of the present invention. 3B is a schematic diagram of an embodiment of a switch circuit of the present invention. 4 is a schematic flowchart of an embodiment of a method for identifying a multimedia control card of the present invention. 5 is a schematic diagram of another embodiment of the multimedia control card of the present invention. FIG. 6 is a schematic flowchart of an embodiment of the present invention for identifying a connection state of a first multimedia interface. 7 is a schematic diagram of an embodiment of a switch circuit of the present invention. 8 is a schematic structural diagram of an embodiment of an image array device of the present invention.

3: Method

30~35: Step

Claims (14)

A method for identifying a multimedia control card includes the following steps: driving a switch circuit to change a control signal from a first level to a second level; outputting the control signal through a multimedia interface; using the multimedia The interface receives a first response signal, and the first response signal corresponds to the control signal; and recognizes a connection state of the multimedia interface according to the first response signal, wherein the connection state is connected to a multimedia signal source, connected to A display device or unconnected state. The method for identifying a multimedia control card as described in item 1 of the patent application scope, wherein identifying the connection status of the multimedia interface according to the first response signal further includes the following steps: the switch circuit receives the first response signal and It is converted into a first signal level; and when the first signal level has a first state, it is recognized that the multimedia interface is connected to the multimedia signal source, and the multimedia control card is a multimedia control card with a signal output function , A warning message is generated. The method for identifying a multimedia control card as described in item 1 of the patent scope, wherein identifying the connection status of the multimedia interface according to the first response signal further includes the following steps: receiving the first response signal with the switch circuit and It is converted into a first signal level; it is determined that when the first signal level has a second state, a voltage is provided by the multimedia interface; a second response signal corresponding to the voltage is received; and according to the second response signal Determine whether the multimedia interface is connected to the display device or not connected. The method for identifying a multimedia control card as described in item 3 of the patent application scope, in which the judgment The connection state of the multimedia interface further includes the following steps: receiving the second response signal to generate a second signal level; determining that the multimedia interface is not connected when the second signal level has a third state Determine when the second signal level has a fourth state, identify that the multimedia interface is connected to the display device, and generate a warning message when the multimedia control card is a multimedia control card with a signal input function. A multimedia control card has a signal receiving function or a signal output function. The multimedia control card includes: a multimedia interface; a switch circuit connected to the multimedia interface to change a control signal from a first level To a second level and output the control signal through the multimedia interface, the switch circuit receives a first response signal received by the multimedia interface, the first response signal corresponds to the control signal; and a controller, The switch circuit is connected to identify a connection state of the multimedia interface according to the first response signal, wherein the connection state is connected to a multimedia signal source, connected to a display device or not connected. The multimedia control card as described in item 5 of the patent application, wherein the switcher circuit converts the first response signal into a first signal level, and recognizes that the first signal level has a first state The multimedia interface is connected to the multimedia signal source, wherein when the multimedia control card is a multimedia control card with a signal output function, a warning message is issued. The multimedia control card as described in item 6 of the patent application scope, in which the switcher circuit is further included It includes: a switch circuit that generates a corresponding switch signal according to the first response signal; and a detection circuit that receives the switch signal and generates the first signal level according to the switch signal. The multimedia control card as described in item 5 of the patent application scope, wherein the switcher circuit receives the first response signal and converts the first response signal into a first signal level, when the first signal level has a first In the two states, the switch circuit outputs a voltage and outputs it through the multimedia interface. As described in item 8 of the patent application scope, the multimedia control card further has a comparator for receiving a second response signal corresponding to the voltage. When it is judged that the second signal level has a third state, Recognizing that the multimedia interface is in an unconnected state, when it is determined that the second signal level has a fourth state, identifying that the multimedia interface is connected to the display device, wherein when the multimedia interface is connected to the display device, if When the multimedia control card is a multimedia control card with a signal input function, a warning message is issued. An image array device includes: a switching unit; at least one multimedia control card, electrically connected to the switching unit, each multimedia control card includes: a multimedia interface; a switch circuit, connected to the multimedia interface, a The control signal is changed from a first level to a second level, and the control signal is output through the multimedia interface to receive a first response signal received by the multimedia interface, the first response signal corresponds to the control signal; And a controller connected to the switch circuit to identify the connection state of the multimedia interface according to the first response signal. The image array device as described in item 10 of the patent application scope, in which the switch circuit will The first response signal is converted into a first signal level, and when it is determined that the first signal level has a first state, the multimedia interface is recognized to be connected to a multimedia signal source, wherein when the multimedia control card is a signal output function When the multimedia control card is sent, a warning message is issued. The image array device as described in item 11 of the patent application range, wherein the switcher circuit further includes: a switch circuit that generates a corresponding switch signal according to the first response signal; and a detection circuit that receives the switch signal And generate the first signal level according to the switch signal. The image array device as described in item 10 of the patent application range, wherein the switcher circuit receives the first response signal and converts the first response signal into a first signal level, when the first signal level has a first In the two states, the switch circuit outputs a voltage and outputs it through the multimedia interface. As described in item 13 of the patent application, the image array device further includes a comparator for receiving a second response signal corresponding to the voltage. When it is determined that the second signal level has a third state, Recognize that the multimedia interface is in a disconnected state, when it is determined that the second signal level has a fourth state, recognize that the multimedia interface is connected to the display device, and if the multimedia control card is a multimedia control card with a signal input function , A warning message is issued.

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