JP2018063275A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of reducing unnecessary radiation.SOLUTION: An electronic apparatus (1) for inputting or outputting an image signal via a cable (5) including a first cable (5) and a second cable (6) comprises: a connector terminal (41) to which each of the first cable and the second cable can be connected; a first signal processing unit (15) which processes the first signal input or output through a first signal line (31) via the first cable; a second signal processing unit (17) which processes the second signal input or output through a second signal line (32) via the second cable; a switch unit (16) which switches a connection state of the second signal line between the connector terminal and the second signal processing unit; and a control unit (18) which controls the switch unit on the basis of the first signal line state detected by the first signal processing unit and the second signal line state detected by the second signal processing unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic device that reduces unnecessary radiation.

  Conventionally, there are DVI (Digital Visual Interface) and HDMI (registered trademark) (High-Definition Multimedia Interface) as standards for an output interface of a video signal to an image projection apparatus or a PC monitor. For transmission of such a video signal, a high-speed differential signal of TMDS (Transition Minimized Differential Signaling) method is used.

  For example, the connector terminal of one of the image output apparatus and the image input apparatus connected via a transmission cable corresponds to the single-link mode of the DVI standard, while the connector terminal of the other apparatus is the dual-link of the DVI standard. May correspond to mode. In such a case, a part of the transmission cable is in an unconnected state from the connector terminal of one of the devices, becomes a one-sided connection state, and the conductor wire of the transmission cable becomes high impedance. At this time, noise flowing into the conductor wire in a high impedance state is radiated to the space using the conductor wire as an antenna, and unnecessary radiation is generated.

  Such unnecessary radiation generates noise that flickers the screen of an image projection apparatus or a PC monitor. In addition, when the amount of radiation is large, it may affect peripheral electrical products and cause malfunctions. Also, whether or not such unwanted radiation occurs is determined by the combination of the image output device and the image input device connected via the transmission cable, and therefore can be determined by the appearance of the transmission cable and connector terminal. Can not. For this reason, countermeasures against unnecessary radiation are difficult, and countermeasures against unnecessary radiation require time and cost. In recent years, a high-speed operation clock is used to transmit a higher-definition image, and the influence of unnecessary radiation is great.

  Patent Document 1 discloses an image display device that displays the type of attached cable.

Japanese Patent No. 4821824

  However, the image display device disclosed in Patent Document 1 cannot prevent (reduce) the occurrence of unnecessary radiation even though it can display a warning regarding the type of cable that may generate unnecessary radiation.

  Therefore, the present invention provides an electronic device that can reduce unnecessary radiation.

  An electronic apparatus according to an aspect of the present invention is an electronic apparatus that inputs or outputs an image signal via a cable including a first cable and a second cable, and includes the first cable and the second cable. A connector terminal to which each of the cables can be connected, and a first signal processing unit that processes a first signal input or output through the first signal line via the first cable; A second signal processing unit for processing a second signal input or output through the second signal line via the second cable; the connector terminal; and the second signal processing unit. A switch unit for switching a connection state of the second signal line between the first signal line unit detected by the first signal processing unit and the second signal processing unit detected by the second signal processing unit Based on the state of the second signal line And a control unit for controlling the switch unit.

  Other objects and features of the present invention are illustrated in the following examples.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can reduce unnecessary radiation can be provided.

1 is a block diagram illustrating a configuration of an electronic apparatus (image projection apparatus) in Embodiment 1. FIG. 3 is a flowchart illustrating an operation of the electronic device according to the first embodiment. 6 is a block diagram illustrating a configuration of an electronic apparatus (image projection apparatus) in Embodiment 2. FIG. 6 is a flowchart illustrating an operation of an electronic device according to a second embodiment. FIG. 10 is a block diagram illustrating a configuration of an electronic device (image output device) in Embodiment 3. 10 is a flowchart illustrating an operation of an electronic device (image output device) in Embodiment 3.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  Regarding a transmission cable for connecting a device such as a computer (PC) that outputs an output image to an electronic device such as an image projection device (projector) or an image display device (PC monitor), a conductor ( There is a case where the signal line is electrically single-connected. Such a one-sided conductor has a high impedance and is in a state in which flowing noise is likely to be radiated. In this embodiment, therefore, the impedance of the electrically conductive conductor in the transmission cable is stabilized, and unnecessary radiation is reduced. Hereinafter, the configuration of an electronic device for reducing unnecessary radiation will be described in each embodiment.

  First, with reference to FIG. 1, the electronic device (unnecessary radiation countermeasure apparatus) in Example 1 of this invention is demonstrated. FIG. 1 is a block diagram illustrating a configuration of an image projection apparatus 1 (electronic device), an image output apparatus 2, and a cable 4 that connects the image projection apparatus 1 and the image output apparatus 2. The image projection apparatus 1 is configured to reduce unnecessary radiation.

  The image projection apparatus 1 has a high-pressure mercury lamp as the light source 7. The image projection apparatus 1 can project various images (images) onto a screen (not shown) through each panel (liquid crystal panel) using light from a light source. A signal (image signal) corresponding to an image projected on the screen is input from the image output device 2 to the image projection device 1. The image output device 2 is a computer (PC), a video disc player, or the like, and includes a signal processing unit 3 (signal processing IC) that creates various videos. An image signal (input image) input from the image output device 2 to the image projection device 1 is a digital signal such as DVI (Digital Visual Interface) or HDMI (High-Definition Multimedia Interface). However, the input image is not limited to these, and may be another digital signal or an analog signal such as NTSC (National Television System Committee).

  An output signal (image signal) from the image output device 2 is transmitted as a high-speed digital signal to the image projection device 1 via the cable 4 (DVI_Dual-Link cable). The cable 4 includes a first cable 5 and a second cable 6. As described above, the image projection apparatus 1 is an electronic apparatus that inputs an image signal via the cable 5 including the first cable 5 and the second cable 6.

  The first cable 5 transmits the first signal TMDS_Data1 and is composed of a total of six signal lines (conductor lines) of three pairs of differential signals. The second cable 6 transmits the second signal TMDS_Data2, and is composed of a total of six signal lines (conductor lines) of three pairs of differential signals. The light source 7 is a high pressure mercury lamp. Light from the light source 7 is emitted toward the prism unit 8 (prism device). The prism unit 8 separates the light from the light source 7 into three primary colors, red, blue, and green, and sends them to the panels corresponding to each color (red panel 9, blue panel 10, green panel 11). The prism unit 8 combines the reflected lights from the panels and sends them to the lens 12 (projection lens). The lens 12 projects the light sent from the prism unit 8 toward a screen (not shown).

  In order to project an image of each color panel, the light source 7 needs to emit light. Therefore, the ballast device 13 uses the power supplied from the power supply circuit 14 to create a high voltage for lighting the light source 7. The power supply circuit 14 obtains a commercial power supply from an external AC power supply (not shown), creates various voltages necessary for each part such as the ballast device 13, and supplies the voltages to each part.

  The image projection apparatus 1 includes signal processing units 15 and 17 (signal processing ICs) that process image signals input from the image output apparatus 2 via the cables 4 (first cable 5 and second cable 6). . The signal processing unit 15 (first signal processing unit) is a high-speed digital signal (first signal TMDS_Data1) input from the image output device 2 via the first cable 5 through the first signal line 31. And the processed first signal is output to the image processing unit 19 (image processing IC). The signal processing unit 17 (second signal processing unit) is a high-speed digital signal (second signal TMDS_Data2) input from the image output device 2 through the second cable 6 through the second signal line 32. , And outputs the processed second signal to the image processing unit 19 (image processing IC). The switch unit 16 (switching unit) switches the connection state of the second signal line 32 between the connector terminal 41 and the signal processing unit 17. In this embodiment, the switch unit 16 connects (grounds) the second signal TMDS_Data2 input via the second cable 6 to the GND on the board, or the signal processing unit 17 (signal processing) IC) is selected (switched). That is, the switch unit 16 includes a first state in which the second signal line 32 connected to the second cable 6 via the connector terminal 41 is electrically connected to the signal processing unit 17, and the second signal line 32. Can be switched to a second state in which is connected to GND.

  In the CPU 18, the signal processing unit 15 detects the first signal (signal input via the first cable 5), and the signal processing unit 17 inputs the second signal (input via the second cable 6). When the detected signal is detected, the switch unit 16 is controlled to the first state. On the other hand, when the signal processing unit 15 detects the first signal and the signal processing unit 17 does not detect the second signal, the CPU 18 controls the switch unit 16 to the second state. In this embodiment, the image signal is a signal corresponding to the DVI standard. Then, the CPU 18 controls the switch unit 16 to the first state in the dual-link mode. On the other hand, the CPU 18 controls the switch unit 16 to the second state in the single-link mode.

  In this embodiment, the switch unit 16 is formed on a semiconductor chip. Preferably, the switch unit 16 includes a correction circuit (not shown) that corrects the time delay of the second signal TMDS_Data2 that passes through the second signal line 32 (a plurality of signal lines). Alternatively, preferably, the switch unit 16 includes a memory (not illustrated) that temporarily holds the second signal TMDS_Data2 that passes through the second signal line 32 (a plurality of signal lines). The second signals TMDS_Data2 passing through the signal lines are output at the same time. Further, the wiring length on the semiconductor chip may be changed according to the layout of the switch unit 16. With such a configuration, the time delay of the second signal TMDS_Data2 can be compensated and the time of the second signal TMDS_Data2 can be aligned and output, so that it is possible to provide a higher performance electronic device.

  The image projection apparatus 1 can recognize (determine) whether the image output apparatus 2 connected via the cable 4 is compatible with the single-link mode or the dual-link mode. For example, when the signal processing unit 17 receives a signal transmitted via the cable 4 (second cable 6), the connected image output device 2 corresponds to the Dual-Link mode in the CPU 18 (control unit). It is determined that On the other hand, when the signal processing unit 17 has not received a signal, the CPU 18 determines that the image output apparatus 2 is compatible with the single-link mode. Thus, the CPU 18 detects the state of the first signal line 31 detected by the signal processing unit 15 (first detection unit) and the second signal line detected by the signal processing unit 17 (second detection unit). The switch unit 16 is controlled based on the state of 32. In this embodiment, the image output device 2 accesses a ROM (not shown) of the image projection device 1. The image output device 2 can display on the screen a resolution that the image output device 2 can output to the image projection device 1 based on EDID information (Extended Display Identification Data) acquired from the ROM.

  The high-speed digital signals processed by the signal processing units 15 and 17 correspond to the red panel 9, the blue panel 10, and the green panel 11 of the image projection apparatus 1 by the image processing unit 19 (appropriate ) The resolution is converted and sent to the panel driver 20. The panel driver 20 drives the red panel 9, the blue panel 10, and the green panel 11 based on the output signal from the image processing unit 19.

  In this embodiment, in order to transmit a high-speed digital signal from the image output apparatus 2 to the image projection apparatus 1, the image projection apparatus 1 and the image output apparatus 2 are connected using a cable 4. The cable 4 has a total of 24 conductor lines such as a first cable 5, a second cable 6, a control signal line, and a GND line.

  The image projection apparatus 1 includes a connector terminal 41 that can connect each of the first cable 5 and the second cable 6. Similarly, the image output apparatus 2 includes a connector terminal 42 that can connect each of the first cable 5 and the second cable 6. In the present embodiment, the connector terminal 41 (DVI input terminal) of the image projection apparatus 1 corresponds to the Dual-Link mode, but the connector terminal 42 (DVI output terminal) of the image output apparatus 2 corresponds to the Single-Link mode. doing. For this reason, the second cable 6 (six conductor wires of the second signal TMDS_Data2) is in an unconnected state from the connector terminal 42 of the image output device 2, and becomes a single connection state, and the conductor wire is high. Impedance. At this time, noise flowing into the second cable 6 (conductor line of the second signal TMDS_Data2) in the high impedance state is radiated to the space using the conductor line as an antenna, and unnecessary radiation is generated.

  Next, with reference to FIG. 2, the operation (operation for reducing unnecessary radiation) of the electronic apparatus (image projection apparatus 1) in the present embodiment will be described. FIG. 2 is a flowchart showing the operation of the image projection apparatus 1. Each step of FIG. 2 is mainly executed based on a command from the CPU 18.

  When a high-speed digital signal (video signal) such as DVI is input from the image output device 2 to the image projection device 1 (signal processing unit 17), in step S201, the CPU 18 performs video signal input confirmation (DVI input confirmation). Do. At this time, the CPU 18 indicates that the signal data is transmitted via the first cable 5 (the first signal TMDS_Data1 is input from the image output device 2, that is, the state of the first signal line 31). Check.

  Subsequently, in step S202, the CPU 18 determines whether or not signal data is transmitted via the second cable 6 (whether or not the second signal TMDS_Data2 is input from the image output apparatus 2, that is, the second signal). The state of the line 32) is determined. This determination is based on information acquired from the signal processor 15 that receives the first signal TMDS_Data1 and the signal processor 17 that receives the second signal TMDS_Data2 (that is, the state of the first signal line 31 and the second signal Of the signal line 32). When the second signal TMDS_Data2 is transmitted, the process proceeds to step S203, and the CPU 18 shifts to the dual-link mode.

  On the other hand, when the second signal TMDS_Data2 is not transmitted, the process proceeds to step S204, and the CPU 18 shifts to the single-link mode. Subsequently, in step S205, the CPU 18 controls the switch unit 16 connected to the second cable 6 that transmits the second signal TMDS_Data2, and connects (switches) the data line of the second signal TMDS_Data2 to GND.

  Subsequently, in step S206, the CPU 18 determines whether or not the signal data is transmitted via the first cable 5 (whether or not the first signal TMDS_Data1 is input from the image output device 2, that is, the first signal). The state of the line 31) is determined. If the first signal TMDS_Data1 is transmitted, step S206 is repeated. On the other hand, if the first signal TMDS_Data1 is not transmitted, the process proceeds to step S207. In step S207, the CPU 18 restores the data line of the second signal TMDS_Data2 (separates from GND).

  With such a configuration, the impedance of the conductor line in the high impedance state that transmits the second signal TMDS_Data2 is reduced, and a noise component flows into the GND. For this reason, the reduction | decrease radiated | emitted to space can be prevented or reduced by making a conductor wire into an antenna. As a result, unnecessary radiation is reduced, and the influence on other input images and the malfunction of other electric products can be avoided.

  In this embodiment, the electronic device is an image projection device that inputs an image signal from the image output device via a cable and projects an image corresponding to the image signal. However, the present embodiment is not limited to this, and can also be applied to an image display device (electronic device) that inputs an image signal from an image output device via a cable and displays an image corresponding to the image signal. It is.

  Next, with reference to FIG. 3, an electronic device (unwanted radiation countermeasure device) in the second embodiment of the present invention will be described. FIG. 3 is a block diagram illustrating the configuration of the image projection apparatus 1a (electronic device), the image output apparatus 2, and the cable 4 that connects the image projection apparatus 1 and the image output apparatus 2. The image projection apparatus 1a according to the present embodiment is different from the image projection apparatus 1 according to the first embodiment in that a switch section 21 (cutting section) is provided instead of the switch section 16 (switching section). Since other configurations in the present embodiment are the same as those in the first embodiment, description thereof is omitted.

  The switch unit 21 (cutting unit) switches the connection state of the second signal line 32 between the connector terminal 41 and the signal processing unit 17. In the present embodiment, the switch unit 21 transmits the second signal TMDS_Data2 input via the second cable 6 to the signal processing unit 17 (signal processing IC) or electrically disconnects it ( Select (switch). That is, the switch unit 21 includes a first state in which the second signal line 32 connected to the second cable 6 via the connector terminal 41 is electrically connected to the signal processing unit 17, and the second signal line 32. Can be switched to the second state in which the signal processing unit 17 is physically disconnected. The switch unit 21 is formed on a semiconductor chip, for example.

  Next, with reference to FIG. 4, the operation (operation for reducing unnecessary radiation) of the electronic apparatus (image projection apparatus 1a) in the present embodiment will be described. FIG. 4 is a flowchart showing the operation of the image projection apparatus 1a. Each step of FIG. 2 is mainly executed based on a command from the CPU 18. In this embodiment, steps S401 to S404 and S406 of FIG. 4 are the same as steps S201 to S204 and S206 (embodiment 1) of FIG.

  In step S405, the CPU 18 controls the switch unit 21 connected to the second cable 6 that transmits the second signal TMDS_Data2, and electrically disconnects the data line of the second signal TMDS_Data2 from the signal processing unit 17. . Then, the process proceeds to step S406. When the first signal TMDS_Data1 is not transmitted in step S406, the process proceeds to step S407, and the CPU 18 restores the data line of the second signal TMDS_Data2 (electrically connects the data line to the signal processing unit 17). ).

  With such a configuration, the impedance of the conductor line in the high impedance state that transmits the second signal TMDS_Data2 is reduced, and a noise component flows into the GND. For this reason, the reduction | decrease radiated | emitted to space can be prevented or reduced by making a conductor wire into an antenna. As a result, unnecessary radiation is reduced, and the influence on other input images and the malfunction of other electric products can be avoided.

  Next, with reference to FIG. 5, an electronic apparatus (unwanted radiation countermeasure device) according to the third embodiment of the present invention will be described. FIG. 5 is a block diagram illustrating the configuration of the image projection device 28, the image output device 22 (electronic device), and the cable 4 that connects the image projection device 28 and the image output device 22.

  In the present embodiment, the image output device 22 can output a signal in the DVI_Dual-Link mode, and can output a video signal (image signal) to an image display device (PC monitor), an image projection device (liquid crystal projector), or the like. . In this embodiment, the video signal output from the image output device 22 is input to the image projection device 28.

  The image output device 22 includes an image processing unit 23 (image processing IC) that can generate and output various image signals. The image output device 22 includes signal processing units 24 and 25 (signal processing ICs) that convert the image signal output from the image processing unit 23 into a TMDS signal (first signal TMDS_Data1, second signal TMDS_Data2). The TMDS signal converted by the signal processing units 24 and 25 is a high-speed digital signal via the cable 4 (DVI_Dual-Link cable) including the first cable 5 and the second cable 6. It is transmitted to the signal processing unit 29 (signal processing IC). That is, the first signal TMDS_Data1 converted by the signal processing unit 24 (first signal processing unit) passes through the first signal line 33 and is output to the signal processing unit 29 via the first cable 5. . The second signal TMDS_Data2 converted by the signal processing unit 25 (second signal processing unit) passes through the second signal line 34 and is output to the signal processing unit 29 via the second cable 6. .

  The switch unit 26 (switching unit) switches the connection state of the second signal line 34 between the connector terminal 52 and the signal processing unit 25. In the present embodiment, the switch unit 26 connects (grounds) the second signal TMDS_Data2 output from the signal processing unit 25 to the GND on the substrate, or projects an image via the second cable 6. Whether to transmit to the device 28 is selected (switched). The switch unit 26 is formed on, for example, a semiconductor chip.

  The signal processing unit 29 processes the digital signal (first signal TMDS_Data1) input from the image output device 22 via the cable 4 (first cable 5), and outputs the processed digital signal to the image processing unit 19 To do. The panel driver 20 drives the red panel 9, the blue panel 10, and the green panel 11 based on the output signal from the image processing unit 19.

  In this embodiment, in order to transmit a high-speed digital signal from the image output device 22 to the image projection device 28, the image projection device 28 and the image output device 22 are connected using the cable 4. The cable 4 has a total of 24 conductor lines such as a first cable 5, a second cable 6, a control signal line, and a GND line.

  In this embodiment, the connector terminal 52 (DVI output terminal) of the image output device 22 corresponds to the Dual_Link mode, but the connector terminal 51 (DVI input terminal) of the image projection device 28 corresponds to the Single-Link mode. Yes. For this reason, the second cable 6 (the conductor wire of the second signal TMDS_Data2) is in an unconnected state from the connector terminal 51 of the image projection device 28, and is in a one-sided connection state so that the conductor wire has a high impedance. . At this time, noise flowing into the second cable 6 (conductor line of the second signal TMDS_Data2) in the high impedance state is radiated to the space using the conductor line as an antenna, and unnecessary radiation is generated.

  Next, with reference to FIG. 6, the operation (operation for reducing unnecessary radiation) of the electronic apparatus (image output device 22) in the present embodiment will be described. FIG. 6 is a flowchart showing the operation of the image output device 22. Each step of FIG. 6 is mainly executed based on a command from the CPU 27 (control unit).

  When the image output device 22 starts outputting a high-speed digital signal (video signal) such as DVI to the image projection device 28 (signal processing unit 29), in step S601, the CPU 27 performs video signal output confirmation (DVI output confirmation). Do. At this time, the CPU 27 indicates that the signal data is transmitted via the first cable 5 (the first signal TMDS_Data1 is output from the image output device 22, that is, the state of the first signal line 33). Check.

  Subsequently, in step S602, the CPU 27 determines whether or not signal data is transmitted via the second cable 6 (that is, whether or not the second signal TMDS_Data2 is output from the image output device 22). . This determination is performed based on information acquired from the signal processing unit 24 that outputs the first signal TMDS_Data1 and the signal processing unit 25 that outputs the second signal TMDS_Data2. When the second signal TMDS_Data2 is transmitted, the process proceeds to step S603, and the CPU 27 shifts to the dual-link mode.

  On the other hand, when the second signal TMDS_Data2 is not transmitted, the process proceeds to step S604, and the CPU 27 shifts to the single-link mode. Subsequently, in step S605, the CPU 27 controls the switch unit 26 connected to the second cable 6 that transmits the second signal TMDS_Data2, and connects (switches) the data line of the second signal TMDS_Data2 to GND.

  Subsequently, in step S606, the CPU 27 determines whether or not the signal data is transmitted via the first cable 5 (whether or not the first signal TMDS_Data1 is output from the image output device 22, that is, the first signal. The state of the line 33) is determined. If the first signal TMDS_Data1 is transmitted, step S606 is repeated. On the other hand, if the first signal TMDS_Data1 is not transmitted, the process proceeds to step S607. In step S607, the CPU 27 restores the data line of the second signal TMDS_Data2 (separates from GND).

  With such a configuration, the impedance of the conductor line in the high impedance state that transmits the second signal TMDS_Data2 is reduced, and a noise component that flows into the conductor line flows into the GND. For this reason, the reduction | decrease radiated | emitted to space can be prevented or reduced by making a conductor wire into an antenna. As a result, unnecessary radiation is reduced, and the influence on other input images and the malfunction of other electric products can be avoided.

  According to each embodiment, an image input device such as an image projection device (projector) or an image display device (PC monitor) and an image output device (PC) are connected via a cable to transmit high-speed digital signals. It is possible to prevent (reduce) the generation of unnecessary radiation that occurs when the operation is performed. More specifically, it is possible to effectively prevent the wiring in the cable from being connected to one side due to the relationship between the image input device and the image output device and acting as an antenna for unnecessary radiation. For this reason, according to each Example, the electronic device which can reduce unnecessary radiation can be provided.

  As mentioned above, although the preferable Example of this invention was described, this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary.

1 Image projection device (electronic equipment)
15 Signal processor (first signal processor)
16 switch unit 17 signal processing unit (second signal processing unit)
18 CPU (control unit)
41 Connector terminal

Claims (12)

An electronic device that inputs or outputs an image signal via a cable including a first cable and a second cable,
A connector terminal capable of connecting each of the first cable and the second cable;
A first signal processing unit that processes a first signal input or output through the first signal line via the first cable;
A second signal processing unit that processes a second signal that is input or output through the second signal line via the second cable;
A switch unit for switching a connection state of the second signal line between the connector terminal and the second signal processing unit;
The switch unit is controlled based on the state of the first signal line detected by the first signal processing unit and the state of the second signal line detected by the second signal processing unit. And an electronic device. The switch part is
A first state in which the second signal line connected to the second cable via the connector terminal is electrically connected to the second signal processing unit;
The electronic apparatus according to claim 1, wherein the electronic apparatus can be switched to a second state in which the second signal line is connected to GND.   When the first signal processing unit detects the first signal and the second signal processing unit does not detect the second signal, the control unit connects the second signal line to the GND. The electronic device according to claim 2, wherein the switch unit is controlled to be connected to the electronic device. The second signal line includes a plurality of signal lines,
The electronic device according to claim 2, wherein the switch unit includes a correction circuit that corrects a time delay of the second signal passing through the plurality of signal lines. The second signal line includes a plurality of signal lines,
The switch unit includes a memory that temporarily holds the second signal passing through the plurality of signal lines,
4. The electronic device according to claim 2, wherein the memory outputs the second signals that pass through the plurality of signal lines at the same time. 5. The switch part is
A first state in which the second signal line connected to the second cable via the connector terminal is electrically connected to the second signal processing unit;
The electronic apparatus according to claim 1, wherein the electronic apparatus can be switched to a second state in which the second signal line is physically disconnected from the second signal processing unit.   When the first signal processing unit detects the first signal and the second signal processing unit does not detect the second signal, the control unit connects the second signal line to the first signal line. The electronic device according to claim 6, wherein the switch unit is controlled so as to be physically disconnected from the two signal processing units. The controller is
When the first signal processing unit detects the first signal and the second signal processing unit detects the second signal, the switch unit is controlled to the first state;
When the first signal processing unit detects the first signal and the second signal processing unit does not detect the second signal, the switch unit is controlled to the second state. The electronic apparatus according to claim 2, wherein the electronic apparatus is characterized in that: The image signal is a signal corresponding to the DVI standard,
The controller is
In the Dual-Link mode, the switch unit is controlled to the first state,
The electronic device according to claim 2, wherein the switch unit is controlled to the second state in a single-link mode.   10. The image projection apparatus according to claim 1, wherein the electronic device is an image projection apparatus that inputs the image signal from the image output apparatus via the cable and projects an image corresponding to the image signal. The electronic device as described in the paragraph.   10. The image display device according to claim 1, wherein the electronic device is an image display device that inputs the image signal from the image output device via the cable and displays an image corresponding to the image signal. Item 1. An electronic device according to item 1.   The electronic apparatus according to claim 1, wherein the electronic apparatus is an image output apparatus that outputs the image signal to an image input apparatus via the cable.