CN111653234A - Bidirectional transmission device, LED driving device, LED control system and bidirectional transmission method - Google Patents
Bidirectional transmission device, LED driving device, LED control system and bidirectional transmission method Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention provides a bidirectional transmission device which comprises a first interface module, a second interface module, a line selection module, a data control module and a load, wherein the input end of the line selection module is alternatively connected with the first interface module and the second interface module, the output end of the line selection module is connected with the data control module, and the data control module outputs signals to the load. When the line selection module can not receive the input signal of the first interface module, the second interface module inputs a signal to the line selection module, the line selection module inputs a signal to the data control module, and the data control module outputs a signal to the load. The first interface module and the second interface module can be used as input ends and output ends through circuits arranged on the first interface module and the second interface module. The circuit state is monitored through the line selection module, and when a dead pixel is generated between the first interface module and the data control module, a transmission path is changed, so that normal transmission is guaranteed.
Description
Technical Field
The invention relates to the technical field of LEDs, in particular to a bidirectional transmission device, an LED driving device, an LED control system and a bidirectional transmission method.
Background
In the field of LED display, when a single dead pixel or more dead pixels occur in a single-line transmission, other normal pixels cannot work normally, so that the entire system cannot be used only due to the single dead pixel or several dead pixels. In the current technology, a dual-channel approach is mainly used to solve this problem, in which each LED driving device has two ports, one port is used for conventional serial connection, and the other port is connected to the circuit of the previous LED driving device, so as to avoid the problem that the dead pixel affects the whole display. However, when a dual-channel circuit is used, one port needs to be added, and if two LED driving devices are damaged continuously, the subsequent circuit cannot be used normally.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the bidirectional transmission device, the LED driving device, the LED control system and the bidirectional transmission method solve the defect that single-wire transmission is easily affected by dead spots to cause high damage on the premise of not increasing the complexity of an application circuit, and greatly reduce the damage rate.
In order to solve the technical problems, the invention adopts the technical scheme that: a bidirectional transmission device comprises a first interface module, a second interface module, a line selection module, a data control module and a load, wherein the input end of the line selection module is alternatively connected with the first interface module and the second interface module, the output end of the line selection module is connected with the data control module, and the data control module outputs signals to the load;
when the line selection module cannot receive an input signal of the first interface module, the line selection module transmits the input signal to the data control module, and the data control module outputs a signal to the load;
when the line selection module receives an input signal of the first interface module, the second interface module inputs a signal to the line selection module, and the line selection module inputs a signal to the data control module and outputs a signal to the load by the data control module.
Specifically, the line selection module comprises an alternative device and a watchdog unit connected with the alternative device, and the watchdog unit controls the alternative device;
the first interface module and the data control module are respectively electrically connected with the watchdog unit;
the first interface module and the second interface module are respectively connected with the alternative device, the alternative device is electrically connected with the data control module, and the alternative device inputs signals to the data control module;
when the line selection module can receive an input signal of a first interface module, the signal of the first interface module is input into the watchdog unit, and the first interface module inputs the signal into the alternative device;
when the line selection module cannot receive the input signal of the first interface module, the second interface module inputs a signal to the alternative, the alternative inputs the data control module, and the data control module inputs a signal to the watchdog unit.
Furthermore, the first interface module is provided with an interface switching unit, and the interface switching unit comprises a first connection state and a second connection state and is used for switching the first interface module to be in the first state or the second state;
the interface switching unit comprises a first signal subunit and a second signal subunit, the first signal subunit is connected with the watchdog unit and the alternative device, the second signal subunit comprises a pull-up circuit/a pull-down circuit, and the pull-up circuit/the pull-down circuit is electrically connected with the data control module;
when the interface switching unit is in a first connection state, the second signal subunit is disconnected;
when the interface switching unit is in a second connection state, the watchdog unit controls the pull-up circuit/pull-down circuit to form a channel;
further, when the line selection module can receive an input signal of the first interface module, the first interface module is in a first state, and when the line selection module cannot receive the input signal of the first interface module, the first interface module is in a second state;
when the first interface module is in a first state, the first signal subunit of the first interface module inputs signals, and the second interface module outputs signals;
when the first interface module is in the second state, the second interface module inputs signals, and the second signal subunit of the first interface module outputs signals.
Specifically, the line selection module comprises an inverter;
when the line selection module can receive an input signal of a first interface module, the first interface module inputs the signal into the watchdog unit, and an output signal of the watchdog unit is output to the second interface module through the inverse control subunit;
when the line selection module cannot receive the input signal of the first interface module, the second interface module inputs the signal to the watchdog unit, and the signal of the watchdog unit is output to the first interface module.
Furthermore, the line selection module further comprises a first switch unit and a second switch unit, the data control module is electrically connected with the first switch unit and the second switch unit respectively, the first switch unit is electrically connected with the first interface module, and the second switch unit is electrically connected with the second interface module;
the first switch unit is also electrically connected with the watchdog unit;
the second switch unit is also electrically connected with the phase inverter, and the phase inverter is also electrically connected with the watchdog unit;
when the data control module can receive an input signal of the first interface module, the watchdog unit controls the first switch unit to be in an off state and controls the second switch unit to be in a on state, so that the data control module outputs a signal to the second interface module;
when the data control module cannot receive the input signal of the first interface module, the watchdog unit controls the first switch unit to be in an on state and controls the second switch unit to be in an off state, so that the data control module receives the input signal of the second interface module.
Specifically, the pull-up/down circuit is provided with a pull-up/down driver, and the pull-up/down driver is electrically connected with the watchdog unit; when the line selection module cannot receive the input signal of the first interface module, the watchdog unit controls the pull-up/pull-down driver to communicate with the pull-up/pull-down circuit.
The second aspect of the present application provides an LED driving apparatus, including the above bidirectional transmission apparatus, the load is an LED output unit, and the LED output unit is used for outputting an LED signal.
The third aspect of the present application provides an LED control system, which includes a first controller and the LED driving devices, wherein N of the LED driving devices are electrically connected, the first controller is electrically connected to the 1 st LED driving device, and the system further includes a second controller electrically connected to the nth driving device;
when a circuit between the ith LED driving device and the (i + 1) th LED driving device is damaged, the first controller control signal is transmitted from the 1 st LED driving device to the ith LED driving device;
the second controller control signal is transmitted from the (i + 1) th LED driving device to the Nth LED driving device;
wherein N is a natural number larger than i, and i is a natural number larger than 1.
A fourth aspect of the present application provides a bidirectional transmission method, which is applied to the LED device, and includes the following steps:
detecting a first signal input by the first interface module;
when the level of the first signal changes, controlling the data control module to receive the first signal;
and when the level of the first signal is not changed, controlling the data control module to stop receiving the first signal, and controlling the data control module to receive a second signal output by the second interface module.
The invention has the beneficial effects that: the first interface module and the second interface module can be used as input ends and output ends through circuits arranged on the first interface module and the second interface module. On the basis, the circuit state is monitored through the line selection module, and when a dead pixel is generated between the first interface module and the data control module, a transmission path is changed, so that normal transmission is guaranteed.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
Fig. 1 is a block diagram showing a first embodiment of a bidirectional transmission apparatus according to the present invention;
FIG. 2 is a block diagram of a second embodiment of the bidirectional transmission apparatus according to the present invention, in which a line selection module can receive input data of a first interface module;
FIG. 3 is a block diagram of a second embodiment of the bidirectional transmission apparatus according to the present invention, in which the line selection module cannot receive input data from the first interface module;
FIG. 4 is a circuit diagram of an interface switch unit in a third embodiment of the bidirectional transmission apparatus according to the present invention;
FIG. 5 is a schematic circuit diagram of an interface switch unit according to a third embodiment of the bidirectional transmission apparatus of the present invention;
FIG. 6 is a block diagram illustrating a structure of a fourth embodiment of a bidirectional transmission apparatus according to the present invention, in which an alternative cannot receive input data of a first interface module;
fig. 7 is a block diagram of a fourth embodiment of a bidirectional transmission apparatus according to the present invention, in which an alternative can receive input data of a first interface module;
FIG. 8 is a schematic circuit diagram of a bidirectional transmission apparatus according to a fourth embodiment of the present invention;
FIG. 9 is a block diagram of a first embodiment of the LED control system of the present invention with no dead spots in the circuit;
FIG. 10 is a schematic diagram of signal transmission when there is a dead pixel in the circuit of the second embodiment of the LED control system;
FIG. 11 is a schematic diagram of another signal transmission when there is a dead pixel in the circuit of the second embodiment of the LED control system of the present invention;
fig. 12 is a flowchart of a bidirectional transmission method according to a first embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, fig. 1 is a block diagram illustrating a bidirectional transmission device according to a first embodiment of the present invention. The application provides a bidirectional transmission device, which comprises a first interface module, a second interface module, a line selection module, a data control module and a load, wherein the input end of the line selection module is alternatively connected with the first interface module and the second interface module, the output end of the line selection module is connected with the data control module, and the data control module outputs signals to the load;
when the line selection module receives an input signal of the first interface module, the line selection module transmits the input signal to the data control module, and the data control module outputs the signal to a load;
when the line selection module can not receive the input signal of the first interface module, the second interface module inputs a signal to the line selection module, the line selection module inputs a signal to the data control module, and the data control module outputs a signal to the load.
The invention has the beneficial effects that: the first interface module and the second interface module can be used as input ends and output ends through circuits arranged on the first interface module and the second interface module. On the basis, the circuit state is monitored through the line selection module, and when a dead pixel is generated between the first interface module and the data control module, a transmission path is changed, so that normal transmission is guaranteed.
The data control module is responsible for decoding, regenerating and PWM generating of data, when the circuit is normal, the regenerated data can be output to the next data transmission device from the second interface module, and the line selection module controls the data transmission mode.
In an embodiment, please refer to fig. 2 and fig. 3, fig. 2 is a block diagram of a bidirectional transmission device according to a second embodiment of the present invention; FIG. 2 is a block diagram of a second embodiment of the bidirectional transmission apparatus according to the present invention, in which a line selection module can receive input data of a first interface module; fig. 3 is a block diagram of a second embodiment of the bidirectional transmission apparatus according to the present invention, in which the line selection module cannot receive input data of the first interface module.
The circuit selection module comprises an alternative device and a watchdog unit connected with the alternative device, and the watchdog unit controls the alternative device;
the first interface module and the second interface module are respectively electrically connected with the watchdog unit;
the first interface module and the second interface module are respectively connected with an alternative device, the alternative device is electrically connected with the data control module, and the alternative device inputs signals to the data control module;
when the data control module can receive input data of the first interface module, a signal of the first interface module is input into the watchdog unit; the first interface module inputs signals to the alternative device;
when the data control module can not receive the input data of the first interface module, the second interface module inputs signals to the alternative device, the alternative device inputs signals to the data control module, and the data control module inputs signals to the watchdog unit.
In this embodiment, the watchdog unit may be a specific circuit or an external chip. In this embodiment, the watchdog unit is used to control the alternative device. It will be appreciated that there are three situations for signal input, in the first case both the first interface module and the second interface module output signals to the alternative, in the second case only the first interface module outputs signals to the alternative, and in both cases only the first interface module outputs signals to the alternative. In the third situation, the alternative device can only receive the signal output by the second interface module, and the alternative device outputs the signal output by the second interface module.
The technical point of the present application is that when a dead pixel occurs in a line, the circuit transmission mode of the first interface module is changed by a circuit inside the first interface module, so that it is necessary to discuss this structure.
In an embodiment, please refer to fig. 4 and 5, fig. 4 is a block diagram of an interface switching unit in a third embodiment of a bidirectional transmission apparatus according to the present invention; fig. 5 is another block diagram of an interface switching unit in a third embodiment of the bidirectional transmission apparatus according to the present invention. The first interface module is provided with an interface switching unit, and the interface switching unit is used for inputting signals or outputting signals.
In one embodiment, the interface switching unit includes a first signal subunit and a second signal subunit, the first signal subunit is connected to the watchdog unit and the alternative, and the second signal subunit includes a pull-up circuit electrically connected to the data control module.
The pull-up circuit comprises a pull-up resistor and a pull-up driver, and the pull-up driver is used for driving the pull-up circuit. The interface switching unit comprises a first connection state and a second connection state, when the interface switching unit is in the first connection state, the second signal subunit is in an open circuit, and the first interface module corresponding to the interface switching unit is in the first state. When the pull-up driver is not driven, the first interface module is in a first state, which serves as an input terminal.
When the interface switching unit is in the second connection state, the watchdog unit controls the pull-up circuit to form a channel, and the first interface module corresponding to the interface switching unit is in the second state. When the data from the first interface module direction does not output the signal to the watchdog unit, the watchdog unit can still receive the signal from the second interface module, at this moment, the watchdog unit starts the pull-up driver, so that the first interface module becomes the output end, and when the first interface module is in the second state, the first interface module serves as the output end.
In another embodiment, a pull-down circuit is used instead of the pull-up circuit described above, the pull-down circuit having a pull-down resistor and a pull-down driver. The principle and circuit structure of using the pull-up circuit and the pull-down circuit are substantially the same, and therefore are not described herein.
In a specific embodiment, only the first interface module is provided with an interface switching unit. When the alternative device can receive the input data of the first interface module, the first interface module is in a first state, and when the alternative device can not receive the input data of the first interface module, the first interface module is in a second state.
When the first interface module is in the first state, the first signal subunit of the first interface module inputs signals, and the second interface module outputs signals.
When the first interface module is in the second state, the second interface module inputs signals, and the second signal subunit of the first interface module outputs signals.
In this embodiment, the first interface module is different from the second interface module, and only the first interface has an interface switching unit. Therefore, the production cost can be reduced, but the difficulty of installation and maintenance is higher.
It will be appreciated that in another particular embodiment, an interface switching unit is provided within the second interface module. In this case, the second interface unit is normally in the first state. In this embodiment, the first interface module and the second interface module are mainly signal transmission directions in a normal state of the circuit, and do not represent a difference between actual circuit structures, and the interface switching units in the first interface module and the second interface module may be the same or different. In this embodiment, when installing and maintaining the two-way transmission device, need not to pay attention to the direction of installing the two-way transmission device, it is all comparatively convenient to install and maintain.
Please refer to fig. 6, fig. 7 and fig. 8. Fig. 6 is a block diagram illustrating a structure of a fourth embodiment of a bidirectional transmission apparatus according to the present invention, in which an alternative cannot receive input data of a first interface module. Fig. 7 is a block diagram of a fourth embodiment of a bidirectional transmission apparatus according to the present invention, in which an alternative can receive input data of a first interface module. Fig. 8 is a schematic circuit diagram of a bidirectional transmission device according to a fourth embodiment of the present invention.
In one embodiment, the line selection module includes a watchdog unit and an inverter;
when the alternative device can receive input data of the first interface module, the first interface module inputs signals to the watchdog unit, and output signals of the watchdog unit reach the second interface module through the phase inverter;
when the alternative device can not receive the input data of the first interface module, the first interface module is adjusted to be in a second state, the second interface module inputs signals to the watchdog unit, and the watchdog unit outputs signals to the first interface module. Therefore, when the first interface module is in the second state, the phase of the current is changed through the phase inverter, the input signal of the second interface module is controlled, and the output signal of the first interface module is controlled.
In a more specific embodiment, the bidirectional transmission device further includes a first switch unit and a second switch unit, the data control module is electrically connected to the first switch unit and the second switch unit respectively, the first switch unit is electrically connected to the first interface module, and the second switch unit is electrically connected to the second interface module;
the first switch unit is also electrically connected with the watchdog unit;
the second switch unit is also electrically connected with the phase inverter, and the phase inverter is also electrically connected with the watchdog unit;
when the line selection module can receive an input signal of the first interface module, the watchdog unit controls the first switch unit to be in an off state and controls the second switch unit to be in an on state, so that the data control module outputs a signal to the second interface module;
when the line selection module cannot receive the input signal of the first interface module, the watchdog unit controls the first switch unit to be in a pass state and controls the second switch unit to be in a break state, so that the data control module receives the input signal of the second interface module.
In this embodiment, the inverter is matched with the second switch unit, so that the first switch unit and the second switch unit are in opposite states, and normal transmission of the circuit is ensured.
In another embodiment, the pull-up or pull-down circuit is provided with a pull-up/pull-down driver, and the pull-up or pull-down driver is electrically connected with the watchdog unit; when the data control module cannot receive the input data of the first interface module, the watchdog unit controls the pull-up or pull-down driver to communicate with the pull-up or pull-down circuit.
In this embodiment, there is a case where the pull-up circuit is turned on by driving of the pull-up driver, so that the second signal subunit outputs a signal; in another case, the pull-down circuit is turned on by the driving of the pull-down driver, so that the second signal subunit outputs the signal. It will be appreciated that the use of pull-up or pull-down circuits is inherently indistinguishable.
The second aspect of the present application provides an LED driving apparatus, which includes the above bidirectional transmission apparatus, wherein the load is an LED output unit, and the LED output unit is used for outputting an LED signal. It can be understood that in some circuits, a constant current output unit is added to output a stable R, G, B three-color signal, so as to ensure the normal output of the whole signal.
Referring to fig. 9, 10 and 11, fig. 9 is a structural diagram of a circuit of an LED control system according to a first embodiment of the present invention when there is no dead point. Fig. 10 is a schematic diagram of signal transmission when a circuit has a dead pixel in the second embodiment of the LED control system. FIG. 11 is a diagram illustrating another signal transmission when there is a dead pixel in the circuit of the second embodiment of the LED control system according to the present invention.
The third aspect of the application provides an LED control system, which includes a first controller, a second controller and the LED driving device, where N LED driving devices are electrically connected, the first controller is electrically connected to the 1 st LED driving device, and the second controller is electrically connected to the nth driving device;
when a circuit between the ith LED driving device and the (i + 1) th LED driving device is damaged, a first controller control signal is transmitted from the 1 st LED driving device to the ith LED driving device;
the second controller control signal is transmitted from the (i + 1) th LED driving device to the Nth LED driving device;
wherein N is a natural number larger than i, and i is a natural number larger than 1.
The system has the advantages that when no dead pixel exists in the LED control system, the N LED driving devices are controlled by the first controller; when the LED control system has a dead pixel at the ith LED driving device or a position between the ith LED driving device and the (i + 1) th LED driving device, the first controller controls the 1 st to the ith LED driving devices, and if the ith LED driving device is damaged, only the ith LED driving device does not work. The (i + 1) th driving device to the Nth driving device are controlled by the second controller, so that the normal operation can still be realized.
It can be understood that, in the system, even if two LED driving devices are damaged continuously, the latter circuit can be normally used, so that the defect that the single-wire transmission is susceptible to high damage caused by a dead point is overcome, and the damage rate is greatly reduced.
Referring to fig. 12, fig. 12 is a flowchart illustrating a bidirectional transmission method according to a first embodiment of the present invention. Specifically, a fourth aspect of the present application provides a bidirectional transmission method, which is applied to the LED device described above, and includes the following steps:
step S100, detecting a first signal input by a first interface module;
step S200, when the level of the first signal changes, controlling the data control module to receive the first signal;
The method of the present application may be used to explain the internal signal transmission of the bidirectional transmission device. In addition, the method of the present application can be used alone, and correspondingly, when the method is used alone, the present application includes another bidirectional transmission apparatus as follows, and the method includes the following units:
the current detection module is used for detecting a first signal input by the first interface module;
the first transmission module is used for controlling the data control module to receive the first signal;
and the second control module is used for controlling the data control module to stop receiving the first signal and controlling the data control module to receive a second signal output by the second interface module.
When the above method is used alone, the above apparatus may also serve as a carrier for carrying the method. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
It should be understood that the above description is only an example of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations that are made by using the contents of the present specification and the accompanying drawings, or are directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A bidirectional transmission device, characterized by: the device comprises a first interface module, a second interface module, a line selection module, a data control module and a load, wherein the input end of the line selection module is alternatively connected with the first interface module and the second interface module, the output end of the line selection module is connected with the data control module, and the data control module outputs signals to the load;
when the line selection module receives an input signal of the first interface module, the line selection module transmits the input signal to the data control module, and the data control module outputs the signal to the load;
when the line selection module cannot receive the input signal of the first interface module, the second interface module inputs a signal to the line selection module, and the line selection module inputs a signal to the data control module and outputs a signal to the load by the data control module.
2. The bidirectional transmission apparatus of claim 1, wherein: the circuit selection module comprises an alternative device and a watchdog unit connected with the alternative device, and the watchdog unit controls the alternative device;
the first interface module and the data control module are respectively electrically connected with the watchdog unit;
the first interface module and the second interface module are respectively connected with the alternative device, the alternative device is electrically connected with the data control module, and the alternative device inputs signals to the data control module;
when the line selection module can receive an input signal of a first interface module, the signal of the first interface module is input into the watchdog unit, and the first interface module inputs the signal into the alternative device;
when the line selection module cannot receive the input signal of the first interface module, the second interface module inputs a signal to the alternative, the alternative inputs the data control module, and the data control module inputs a signal to the watchdog unit.
3. The bidirectional transmission apparatus of claim 2, wherein: the first interface module is provided with an interface switching unit, and the interface switching unit comprises a first connection state and a second connection state and is used for switching the first interface module to be in the first state or the second state;
the interface switching unit comprises a first signal subunit and a second signal subunit, the first signal subunit is connected with the watchdog unit and the alternative device, the second signal subunit comprises a pull-up circuit/a pull-down circuit, and the pull-up circuit/the pull-down circuit is electrically connected with the data control module;
when the interface switching unit is in a first connection state, the second signal subunit is disconnected;
and when the interface switching unit is in a second connection state, the watchdog unit controls the pull-up circuit/pull-down circuit to form a path.
4. A bidirectional transmission device as recited in claim 3, wherein: when the line selection module can receive an input signal of a first interface module, the first interface module is in a first state, and when the line selection module cannot receive the input signal of the first interface module, the first interface module is in a second state;
when the first interface module is in a first state, the first signal subunit of the first interface module inputs signals, and the second interface module outputs signals;
when the first interface module is in the second state, the second interface module inputs signals, and the second signal subunit of the first interface module outputs signals.
5. A bidirectional transmission device as recited in claim 3, wherein: the data selection module comprises an inverter;
when the line selection module can receive an input signal of a first interface module, the first interface module inputs the signal into the watchdog unit, and an output signal of the watchdog unit is output to the second interface module through the inverse control subunit;
when the line selection module cannot receive the input signal of the first interface module, the second interface module inputs the signal to the watchdog unit, and the signal of the watchdog unit is output to the first interface module.
6. The bidirectional transmission apparatus of claim 5, wherein: the circuit selection module further comprises a first switch unit and a second switch unit, the data control module is electrically connected with the first switch unit and the second switch unit respectively, the first switch unit is electrically connected with the first interface module, and the second switch unit is electrically connected with the second interface module;
the first switch unit is also electrically connected with the watchdog unit;
the second switch unit is also electrically connected with the phase inverter, and the phase inverter is also electrically connected with the watchdog unit;
when the data control module can receive an input signal of the first interface module, the watchdog unit controls the first switch unit to be in an off state and controls the second switch unit to be in a on state, so that the data control module outputs a signal to the second interface module;
when the data control module cannot receive the input signal of the first interface module, the watchdog unit controls the first switch unit to be in an on state and controls the second switch unit to be in an off state, so that the data control module receives the input signal of the second interface module.
7. A bidirectional transmission device as recited in claim 3, wherein: the pull-up/pull-down circuit is provided with a pull-up/pull-down driver, and the pull-up/pull-down driver is electrically connected with the watchdog unit; when the line selection module cannot receive the input signal of the first interface module, the watchdog unit controls the pull-up/pull-down driver to communicate with the pull-up/pull-down circuit.
8. An LED driving device is characterized in that; the bidirectional transmission device comprises the bidirectional transmission device as claimed in any one of claims 1 to 7, wherein the load is an LED output unit, and the LED output unit is used for outputting an LED signal.
9. An LED control system comprising a first controller and the LED driving apparatus of claim 8, wherein N of the LED driving apparatuses are electrically connected, and the first controller is electrically connected to the 1 st LED driving apparatus, wherein: the system also comprises a second controller which is electrically connected with the Nth driving device;
when a circuit between the ith LED driving device and the (i + 1) th LED driving device is damaged, the first controller control signal is transmitted from the 1 st LED driving device to the ith LED driving device;
the second controller control signal is transmitted from the (i + 1) th LED driving device to the Nth LED driving device;
wherein N is a natural number larger than i, and i is a natural number larger than 1.
10. A bidirectional transmission method applied to the LED device of any one of claims 1 to 7, comprising the steps of:
detecting a first signal input by the first interface module;
when the level of the first signal changes, controlling the data control module to receive the first signal;
and when the level of the first signal is not changed, controlling the data control module to stop receiving the first signal, and controlling the data control module to receive a second signal output by the second interface module.
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