CN114241984B

CN114241984B - LED driving device, multi-stage LED driving system and driving method

Info

Publication number: CN114241984B
Application number: CN202210118424.2A
Authority: CN
Inventors: 李家栋; 黄建东; 张青松
Original assignee: SHENZHEN GREEN WELLSPRING SEMICONDUCTOR TECHNOLOGY Ltd
Current assignee: SHENZHEN GREEN WELLSPRING SEMICONDUCTOR TECHNOLOGY Ltd
Priority date: 2022-02-08
Filing date: 2022-02-08
Publication date: 2023-04-28
Anticipated expiration: 2042-02-08
Also published as: WO2023151703A1; CN114241984A

Abstract

The application provides an LED driving device, a multi-stage LED driving system and a driving method. The LED driving device comprises a judging circuit, a selecting circuit, a driving circuit, a first transmission channel and a second transmission channel; the first transmission channel is used for transmitting a first display signal and acquiring a first signal segment from the first display signal; the second transmission channel is used for transmitting a second display signal and acquiring a second signal segment from the second display signal; the judging circuit is used for judging whether the first display signal and/or the second display signal is abnormal or not and outputting a selection signal to the selecting circuit according to a judging result; the selection circuit is used for selecting the first signal segment or the second signal segment as a target signal segment according to the selection signal and transmitting the target signal segment to the driving circuit; the driving circuit is used for outputting a driving signal to the LED to be driven according to the target signal section. The multi-stage LED driving system can effectively improve reliability of the multi-stage LED driving system.

Description

LED driving device, multi-stage LED driving system and driving method

[ field of technology ]

The application relates to the technical field of LEDs, in particular to an LED driving device, a multi-stage LED driving system and a driving method.

[ background Art ]

A multi-stage LED (Light-Emitting Diode) driving system is generally applied to an LED display device including a plurality of LEDs, and generally includes a plurality of LED driving devices connected in tandem, each of which is configured to transmit a display signal and output a driving signal according to the transmitted display signal, so as to drive at least one corresponding LED to emit Light, thereby implementing a display function of the LED display device.

In the related art, each LED driving device is connected to ground through a ground line and to a power supply through a power line. When the power supply line and/or the ground line of the target LED driving device are/is open, and/or the inside of the target LED driving device is damaged, the target LED driving device is highly likely to output an erroneous display signal to the subsequent LED driving device (the subsequent LED driving device still outputs an erroneous display signal due to receiving the erroneous display signal, and so on), and since each LED driving device does not have the capability of correctly discriminating whether the transmitted display signal is correct, the display signal transmitted by all the subsequent LED driving devices is erroneous, which results in that all the subsequent LED driving devices are in an abnormal state, such as failure to output a driving signal or abnormality of the output driving signal, etc., so that all LEDs connected to all the subsequent LED driving devices cannot emit light or emit light abnormally, and thus the LED display device cannot normally display a picture, which also means that the reliability of the existing multi-stage LED driving system is low.

Therefore, there is a need for an improvement in the structure of the above-described LED driving device.

[ invention ]

The application provides an LED driving device, a multi-stage LED driving system and a driving method, and aims to solve the problem that the reliability of the multi-stage LED driving system in the related technology is low.

In order to solve the technical problem, a first aspect of the embodiments of the present application provides an LED driving device, including a judging circuit, a selecting circuit, a driving circuit, a first transmission channel and a second transmission channel; the judging circuit and the selecting circuit are respectively connected with the first transmission channel, the judging circuit and the selecting circuit are also respectively connected with the second transmission channel, the judging circuit is connected with the selecting circuit, the selecting circuit is connected with the driving circuit, and the driving circuit is used for connecting an LED to be driven;

the first transmission channel is used for receiving a first display signal sent by the front-stage LED driving device, acquiring a first signal segment from the first display signal and transmitting the first display signal to the rear-stage LED driving device;

the second transmission channel is used for receiving a second display signal sent by the front-stage LED driving device, acquiring a second signal segment from the second display signal and transmitting the second display signal to the rear-stage LED driving device;

The judging circuit is used for judging whether the first display signal and/or the second display signal is abnormal or not, and outputting a selection signal to the selection circuit according to a judging result;

the selection circuit is used for selecting the first signal segment or the second signal segment as a target signal segment according to the selection signal and transmitting the target signal segment to the driving circuit;

the driving circuit is used for outputting a driving signal to the LED to be driven according to the target signal section.

A second aspect of embodiments of the present application provides a multi-stage LED driving system, including a plurality of LED driving devices cascaded one after the other and as described in the first aspect of embodiments of the present application; wherein the first transmission channels in the LED driving devices are connected with each other, and the second transmission channels in the LED driving devices are connected with each other.

A third aspect of the embodiments of the present application provides an LED driving method, which is applied to an LED driving device; the LED driving device comprises a judging circuit, a selecting circuit, a driving circuit, a first transmission channel and a second transmission channel; the judging circuit and the selecting circuit are respectively connected with the first transmission channel, the judging circuit and the selecting circuit are also respectively connected with the second transmission channel, the judging circuit is connected with the selecting circuit, the selecting circuit is connected with the driving circuit, and the driving circuit is used for connecting an LED to be driven;

The LED driving method comprises the following steps:

the first transmission channel receives a first display signal sent by a front-stage LED driving device, acquires a first signal section from the first display signal, and transmits the first display signal to a rear-stage LED driving device;

the second transmission channel receives a second display signal sent by the front-stage LED driving device, acquires a second signal segment from the second display signal, and transmits the second display signal to the rear-stage LED driving device;

the judging circuit judges whether the first display signal and/or the second display signal are abnormal or not, and outputs a selection signal to the selecting circuit according to a judging result;

the selection circuit selects the first signal segment or the second signal segment as a target signal segment according to the selection signal, and transmits the target signal segment to the driving circuit;

and the driving circuit outputs a driving signal to the LED to be driven according to the target signal section.

As can be seen from the above description, compared with the related art, the present application has the following beneficial effects:

when the power line and/or the ground line of the front-stage LED driving device are/is opened and/or the interior of the front-stage LED driving device is damaged, the first transmission channel of the front-stage LED driving device may output an error first display signal to the first transmission channel of the current LED driving device; similarly, the second transmission channel of the previous LED driving device may also output the wrong second display signal to the second transmission channel of the current LED driving device.

If the current LED driving device is a conventional LED driving device, when the first transmission channel of the current LED driving device receives an erroneous first display signal (at this time, a first signal segment obtained from the first display signal is also erroneous), and/or the second transmission channel of the current LED driving device receives an erroneous second display signal (at this time, a second signal segment obtained from the second display signal is also erroneous), the driving circuit of the current LED driving device may directly output the driving signal according to the erroneous first signal segment or the erroneous second signal segment, which results in that the driving circuit cannot output the driving signal or output an abnormal driving signal, thereby making the current LED driving device in an abnormal state.

If the current LED driving device is the LED driving device according to the first aspect of the embodiments of the present application, when the first transmission channel of the current LED driving device receives the wrong first display signal (at this time, the first signal segment obtained from the first display signal is also wrong), and/or the second transmission channel of the current LED driving device receives the wrong second display signal (at this time, the second signal segment obtained from the second display signal is also wrong), the driving circuit of the current LED driving device does not directly output the driving signal according to the wrong first signal segment or the wrong second signal segment, but first determines whether the first display signal received by the first transmission channel and/or the second display signal received by the second transmission channel is abnormal through the determining circuit, and then controls the selecting circuit to select the first signal segment or the second signal segment as the target signal segment according to the determination result, so that the driving circuit outputs the driving signal according to the selected target signal segment, so as to drive the corresponding LED to be driven. It can be understood that, in order to ensure that the driving signal output by the driving circuit is normal, the target signal segment according to which the driving circuit is based is necessarily normal, that is, the judging circuit controls the signal segment selected by the selecting circuit from the first signal segment and the second signal segment and the corresponding display signal according to the judging result to be necessarily normal, so that the current LED driving device is prevented from being in an abnormal state (that is, the driving circuit of the current LED driving device is prevented from outputting the driving signal according to the wrong signal segment), and the reliability of the multi-stage LED driving system is effectively improved.

[ description of the drawings ]

In order to more clearly illustrate the technology of the related art or the technical solutions in the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the description of the related technology or the embodiments of the present application, and it is obvious that the drawings in the following description are only some embodiments of the present application, but not all embodiments, and that other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a block diagram of a conventional multi-stage LED drive system;

fig. 2 is a first block diagram of an LED driving device according to an embodiment of the present application;

fig. 3 is a block diagram of a second module of the LED driving device according to the embodiment of the present application;

fig. 4 is a third block diagram of an LED driving device according to an embodiment of the present disclosure;

fig. 5 is a fourth block diagram of an LED driving device according to an embodiment of the present disclosure;

fig. 6 is a fifth block diagram of an LED driving device according to an embodiment of the present disclosure;

fig. 7 is a sixth block diagram of an LED driving device according to an embodiment of the present disclosure;

FIG. 8 is a first block diagram of a multi-stage LED drive system provided in an embodiment of the present application;

FIG. 9 is a second block diagram of a multi-stage LED drive system provided in an embodiment of the present application;

FIG. 10 is a third block diagram of a multi-stage LED drive system provided in an embodiment of the present application;

FIG. 11 is a fourth block diagram of a multi-stage LED drive system provided in an embodiment of the present application;

fig. 12 is a flowchart of an LED driving method according to an embodiment of the present application.

[ detailed description ] of the invention

For the purposes of making the objects, technical solutions and advantages of the present application more apparent and comprehensible, the present application will be described in detail below with reference to embodiments of the present application and corresponding drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. It should be understood that the following embodiments of the present application are described only for explaining the present application, and are not intended to limit the present application, that is, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the various embodiments of the present application are within the scope of protection of the present application. Furthermore, the technical features referred to in the embodiments of the present application described below may be combined with each other as long as they do not constitute a conflict with each other.

In the related art, each LED driving device in the multi-stage LED driving system is connected to ground through a ground line and to a power supply through a power line. When the power supply line and/or the ground line of the target LED driving device are/is open, and/or the inside of the target LED driving device is damaged, the target LED driving device is highly likely to output an erroneous display signal to the subsequent LED driving device (the subsequent LED driving device still outputs an erroneous display signal due to receiving the erroneous display signal, and so on), and since each LED driving device does not have the capability of correctly discriminating whether the transmitted display signal is correct, the display signal transmitted by all the subsequent LED driving devices is erroneous, which results in that all the subsequent LED driving devices are in an abnormal state, such as failure to output a driving signal or abnormality of the output driving signal, etc., so that all LEDs connected to all the subsequent LED driving devices cannot emit light or emit light abnormally, and thus the LED display device cannot normally display a picture, which also means that the reliability of the conventional multi-stage LED driving system is low. For this reason, the embodiment of the application provides an LED driving device and a multi-stage LED driving system using the same.

Before describing in detail the LED driving device and the multi-stage LED driving system provided in the embodiments of the present application, a brief description will be given of a conventional multi-stage LED driving system. Referring to fig. 1, fig. 1 is a block diagram of a conventional multi-stage LED driving system; wherein u represents a first signal transmission direction, v represents a second signal transmission direction, VDD represents a power line, GND represents a ground line, each "box" represents an LED driving device (i.e., 1, k, a-1, a, a+1, km), m and a are positive integers, and 1 < a < m.

Specifically, the first signal transmission direction u and the second signal transmission direction v are transmission directions of display signals, and each LED driving device has four signal transmission ends, namely a first signal input end (denoted by di 1), a first signal output end (denoted by do 1), a second signal input end (denoted by di 2) and a second signal output end (denoted by do 2); the first signal input terminal di1 and the first signal output terminal do1 are used for transmitting display signals in a first signal transmission direction u, the second signal input terminal di2 and the second signal output terminal do2 are used for transmitting display signals in a second signal transmission direction v, and the display signals transmitted in the first signal transmission direction u and the display signals transmitted in the second signal transmission direction v can be the same or different.

In practical application, when the first signal output end do1 of the LED driving device a is disconnected, the first signal output end do1 of the LED driving device a cannot output a display signal, that is, the first signal input end di1 of the LED driving device a+1 cannot receive the display signal, at this time, the LED driving device a+1 switches the signal input end, that is, receives the display signal output by the second signal output end do2 of the LED driving device a through the second signal input end di2, thereby ensuring that the LED driving device a+1 is not in an abnormal state, and further improving the reliability of the multi-stage LED driving system by a small margin; similarly, when the second signal output terminal do2 of the LED driving device a is turned off, the same is true. However, when the power line VDD and/or the ground line GND of the LED driving device a are open, and/or the inside of the LED driving device a is damaged, the first signal output end do1 and the second signal output end do2 of the LED driving device a may output erroneous display signals, and if the first signal output end do1 of the LED driving device a outputs erroneous display signals, that is, the first signal input end di1 of the LED driving device a+1 receives erroneous display signals, at this time, the LED driving device a+1 does not have the capability of judging the correctness of the display signals received by the first signal input end di1 thereof, and the first signal input end di1 of the LED driving device a+1 is not in a state of receiving no display signals, so that the LED driving device a+1 does not switch the signal input end, that is, the erroneous display signals are not received by the second signal input end di2 thereof, so that the LED driving device a+1 drives the corresponding erroneous display signals received by the first signal input end di1 thereof, and the LED driving device a+1 is in a state of being in which the same as the LED driving device, and the LED driving device a+1 is in a state of being in which the error is in which all LED driving devices are in a state of being in which the LED driving device is in a state of being driven by the LED driving device, and the LED driving device is in which the error, and the LED driving device is in a state of being in which the LED driving device is in which the state of being greatly between the LED driving device and having the LED driving device has a+1 and having an error signal output by the first signal input m; similarly, when the second signal output terminal do2 of the LED driving apparatus a outputs an erroneous display signal, vice versa. The embodiment of the application provides an LED driving device and a multi-stage LED driving system applying the LED driving device.

Referring to fig. 2, fig. 2 is a block diagram of a first module of an LED driving device according to an embodiment of the present application. As shown in fig. 2, the LED driving device provided in the embodiment of the present application includes a judging circuit 100, a selecting circuit 200, a driving circuit 300, a first transmission channel 400, and a second transmission channel 500; the judging circuit 100 and the selecting circuit 200 are respectively connected to the first transmission channel 400, the judging circuit 100 and the selecting circuit 200 are respectively connected to the second transmission channel 500, the judging circuit 100 is connected to the selecting circuit 200, the selecting circuit 200 is connected to the driving circuit 300, and the driving circuit 300 is used for connecting the LEDs to be driven. It can be appreciated that when the LED driving device provided in the embodiment of the present application is applied to a multi-stage LED driving system, each LED driving device in the multi-stage LED driving system is the LED driving device provided in the embodiment of the present application.

Specifically, the first transmission channel 400 is configured to receive a first display signal sent by a previous LED driving device (i.e., an LED driving device located before a current LED driving device), obtain a first signal segment from the first display signal, and transmit the first display signal to a subsequent LED driving device (i.e., an LED driving device located after the current LED driving device). The second transmission channel 500 is configured to receive the second display signal sent by the front-stage LED driving device, obtain a second signal segment from the second display signal, and transmit the second display signal to the rear-stage LED driving device. The judging circuit 100 is configured to judge whether the first display signal and/or the second display signal is abnormal, and output a selection signal to the selecting circuit 200 according to the judging result. The selection circuit 200 is configured to select the first signal segment or the second signal segment as a target signal segment according to the selection signal, and transmit the target signal segment to the driving circuit 300. The driving circuit 300 is configured to output a driving signal to the LED to be driven according to the target signal segment; the drive signals may include, but are not limited to, R, G, B three-color drive signals. Here, it is necessary to explain that the first display signal and the second display signal may be the same or different, but in the embodiment of the present application, the first display signal and the second display signal are the same.

Further, the first display signal and the second display signal are the whole display signals corresponding to all the LED driving devices in the multi-stage LED driving system, that is, all the LED driving devices in the multi-stage LED driving system only use different signal segments in the first display signal or the second display signal respectively. Thus, the first transmission channel 400 of each LED driving device in the multi-stage LED driving system needs to obtain a corresponding first signal segment from the first display signal, and similarly, the second transmission channel 500 of each LED driving device in the multi-stage LED driving system needs to obtain a corresponding second signal segment from the second display signal.

Further, as known from the above-mentioned "judging circuit 100 is used for judging whether the first display signal and/or the second display signal is abnormal", the judging process of the judging circuit 100 is divided into three cases, one is to judge whether the first display signal is abnormal only, the other is to judge whether the second display signal is abnormal only, and the third is to judge whether the first display signal is abnormal or not and whether the second display signal is abnormal or not. It will be appreciated that, in order to ensure that the LED driving device is not in an abnormal state (i.e. that the display signal transmitted by the LED driving device is correct, or that the signal segment utilized by the LED driving device is correct), the determining circuit 100 controls the selecting circuit 200 to select a signal segment from the first signal segment and the second signal segment and the corresponding display signal to be correct. In this regard, if the judging circuit 100 judges the correctness of the first display signal (equivalent to judging the correctness of the first signal segment obtained from the first display signal) and the judging result indicates that the first display signal is correct (equivalent to indicating that the first signal segment is correct), it is unnecessary to judge the correctness of the second display signal (equivalent to unnecessary to judge the correctness of the second signal segment), and at this time, the first signal segment may be directly transmitted and utilized, which is the case of judging only whether the first display signal is abnormal. If the judging circuit 100 judges the correctness of the second display signal (equivalent to judging the correctness of the second signal segment obtained from the second display signal) and the judging result indicates that the second display signal is correct (equivalent to indicating that the second signal segment is correct), it is unnecessary to judge the correctness of the first display signal (equivalent to unnecessary to judge the correctness of the first signal segment), and the second signal segment is directly transmitted and utilized at this time, which is just the case of judging whether the second display signal is abnormal. If the judging circuit 100 judges the correctness of the first display signal and the judging result indicates that the first display signal is abnormal, then the judging circuit needs to judge the correctness of the second display signal, which is the situation that whether the first display signal is abnormal or not is judged, and whether the second display signal is abnormal or not is judged; accordingly, when the judging circuit 100 judges the correctness of the second display signal, and the judging result indicates that the second display signal is abnormal, the judging circuit is also used for judging the correctness of the second display signal.

In practical applications, when the power line and/or the ground line of the front-stage LED driving device are open, and/or the interior of the front-stage LED driving device is damaged, the first transmission channel 400 of the front-stage LED driving device may output an erroneous first display signal to the first transmission channel 400 of the current LED driving device; similarly, the second transmission channel 500 of the previous LED driving device may also output the wrong second display signal to the second transmission channel 500 of the current LED driving device.

If the current LED driving device is the LED driving device provided in this embodiment of the present application, when the first transmission channel 400 of the current LED driving device receives the first display signal with an error (at this time, the first signal segment obtained from the first display signal is also error), and/or the second transmission channel 500 of the current LED driving device receives the second display signal with an error (at this time, the second signal segment obtained from the second display signal is also error), the driving circuit 300 of the current LED driving device does not directly output the driving signal according to the first signal segment with an error or the second signal segment with an error, but first determines whether the first display signal received by the first transmission channel 400 and/or the second display signal received by the second transmission channel 500 is abnormal through the determining circuit 100, and then controls the selecting circuit 200 to select the first signal segment or the second signal segment as the target signal segment according to the determination result, so that the driving circuit 300 outputs the driving signal according to the selected target signal segment to drive the corresponding LED to be driven. It can be understood that, in order to ensure that the driving signal output by the driving circuit 300 is normal, the target signal segment according to which the driving circuit 300 is based is necessarily normal, that is, the judging circuit 100 controls the selecting circuit 200 to select the signal segment from the first signal segment and the second signal segment and the corresponding display signal according to the judging result, so that the current LED driving device is prevented from being in an abnormal state (that is, the driving circuit 300 of the current LED driving device is prevented from outputting the driving signal according to the wrong signal segment), and the reliability of the multi-stage LED driving system can be effectively improved.

In some embodiments, please further refer to fig. 3, fig. 3 is a second block diagram of the LED driving device according to the embodiment of the present application. As shown in fig. 3, the judging circuit 100 may include a judging branch 110 and a controlling branch 120. Specifically, the judging branch 110 is configured to judge whether the first display signal is abnormal, and when the first display signal is abnormal, judge whether the second display signal is abnormal, and when the second display signal is abnormal, return to judge whether the first display signal is abnormal; the control branch 120 is configured to output a selection signal for selecting the first signal segment as the target signal segment to the selection circuit 200 when the first display signal is normal, or output a selection signal for selecting the second signal segment as the target signal segment to the selection circuit 200 when the second display signal is normal.

It can be understood that, for the present embodiment, the judgment logic of the judgment circuit 100 is: the judging branch 110 firstly judges whether the first display signal is abnormal; if the first display signal is normal, the control branch 120 outputs a selection signal for selecting the first signal segment as the target signal segment to the selection circuit 200; if the first display signal is abnormal, the judging branch 110 judges whether the second display signal is abnormal or not; if the second display signal is normal, the control branch 120 outputs a selection signal for selecting the second signal segment as the target signal segment to the selection circuit 200; if the second display signal is abnormal, the judging branch 110 returns to judge whether the first display signal is abnormal; the loop is repeated until the judging branch 110 judges that the first display signal or the second display signal is normal.

Here, it is necessary to explain that, when the first display signal and the second display signal are in the abnormal state for a period of time, the judging branch 110 repeatedly performs the judgment of the correctness between the first display signal and the second display signal until the first display signal or the second display signal is judged to be normal, or that is, the LED driving device repeatedly switches between the first transmission channel 400 and the second transmission channel 500 until the judging branch 110 judges the first display signal or the second display signal to be normal, that is, until the first display signal transmitted by the first transmission channel 400 or the second display signal transmitted by the second transmission channel 500 is determined to be normal.

Of course, the present invention is not limited thereto, and in other embodiments, the judgment logic of the judgment circuit 100 may be: judging branch 110 judges whether the second display signal is abnormal; if the second display signal is normal, the control branch 120 outputs a selection signal for selecting the second signal segment as the target signal segment to the selection circuit 200; if the second display signal is abnormal, the judging branch 110 judges whether the first display signal is abnormal or not; if the first display signal is normal, the control branch 120 outputs a selection signal for selecting the first signal segment as the target signal segment to the selection circuit 200; if the first display signal is abnormal, the judging branch 110 returns to judge whether the second display signal is abnormal; the loop is repeated until the judging branch 110 judges that the first display signal or the second display signal is normal.

In addition, referring still to fig. 3, in the present embodiment, the direction in which the first transmission channel 400 transmits the first display signal may be the first transmission direction x, and the direction in which the second transmission channel 500 transmits the second display signal may be along the second transmission direction y. Of course, the present invention is not limited thereto, and in other embodiments, please further refer to fig. 4 and 5, fig. 4 is a third block diagram of the LED driving device provided in the embodiment of the present application, and fig. 5 is a fourth block diagram of the LED driving device provided in the embodiment of the present application; the direction in which the first transmission channel 400 transmits the first display signal and the direction in which the second transmission channel 500 transmits the second display signal may be both the first transmission direction x and the second transmission direction y.

As an embodiment, the determining branch 110 may be specifically configured to determine whether the level state of the first display signal changes within a preset duration and whether the characteristic index of the first display signal is the same as that of the preset display signal, and when the level state of the first display signal does not change within the preset duration and/or the characteristic index of the first display signal is different from that of the preset display signal, determine whether the level state of the second display signal changes within the preset duration and whether the characteristic index of the second display signal is the same as that of the preset display signal, and when the level state of the second display signal does not change within the preset duration and/or the characteristic index of the second display signal is different from that of the preset display signal, return to determining whether the level state of the first display signal changes within the preset duration and whether the characteristic index of the first display signal is the same as that of the preset display signal. The preset display signal is defined by a user, and is a reference signal preset by the user according to the user's own needs, and when the user's own needs change, the preset display signal also changes, which means that the preset display signal is not unchanged, that is, the preset display signal changes according to the user's own needs. The "the level state of the display signal changes within the preset time period" means that the display signal changes from a high level to a low level or from a low level to a high level within the preset time period; correspondingly, the "the level state of the display signal does not change within the preset time period" means that the display signal always keeps the high level unchanged or keeps the low level unchanged within the preset time period. Further, the characteristic indicators of the first display signal may include, but are not limited to, amplitude, frequency, phase, and timing of the first display signal; similarly, the characteristic indicators of the second display signal may include, but are not limited to, amplitude, frequency, phase, and timing of the second display signal.

Here, it is necessary to explain that if the level state of the first display signal changes within the preset time period and the characteristic index of the first display signal is the same as the preset display signal, it indicates that the first display signal is normal; otherwise, the first display signal is abnormal. Similarly, if the level state of the second display signal changes within the preset time period and the characteristic index of the second display signal is the same as that of the preset display signal, the second display signal is normal; otherwise, the second display signal is abnormal.

It can be understood that the manner of judging whether the display signal is abnormal in this embodiment is: an association of an analysis process with a comparison process; the analysis process is to analyze the change condition of the level state of the display signal within a preset time period, and the comparison process is to compare the characteristic index of the display signal with the preset display signal. For the present embodiment, the judgment logic of the judgment branch 110 is: the judging branch 110 firstly judges whether the level state of the first display signal changes within a preset time period and whether the characteristic index of the first display signal is the same as that of the preset display signal; if the level state of the first display signal changes within the preset duration and the characteristic index of the first display signal is the same as that of the preset display signal, the first display signal is indicated to be normal, and the control branch 120 outputs a selection signal for selecting the first signal segment as the target signal segment to the selection circuit 200; otherwise, the first display signal is indicated to be abnormal, and then the judging branch 110 judges whether the level state of the second display signal changes within a preset time period and whether the characteristic index of the second display signal is the same as that of the preset display signal; if the level state of the second display signal changes within the preset time period and the characteristic index of the second display signal is the same as that of the preset display signal, the second display signal is indicated to be normal, and the control branch 120 outputs a selection signal for selecting the second signal segment as the target signal segment to the selection circuit 200; otherwise, the second display signal is indicated to be abnormal, and the judging branch 110 returns to judge whether the level state of the first display signal changes within the preset time length and whether the characteristic index of the first display signal is the same as that of the preset display signal; the loop is then repeated until the judging branch 110 judges that the level state of the first display signal or the second display signal changes within the preset time period, and the characteristic index of the first display signal or the second display signal is the same as the preset display signal.

Of course, the present invention is not limited thereto, and in other embodiments, the judgment logic of the judgment branch 110 may be: the judging branch 110 judges whether the level state of the second display signal changes within a preset time period and whether the characteristic index of the second display signal is the same as the preset display signal; if the level state of the second display signal changes within the preset time period and the characteristic index of the second display signal is the same as that of the preset display signal, the second display signal is indicated to be normal, and the control branch 120 outputs a selection signal for selecting the second signal segment as the target signal segment to the selection circuit 200; otherwise, the second display signal is indicated to be abnormal, and then the judging branch 110 judges whether the level state of the first display signal changes within a preset time period and whether the characteristic index of the first display signal is the same as that of the preset display signal; if the level state of the first display signal changes within the preset duration and the characteristic index of the first display signal is the same as that of the preset display signal, the first display signal is indicated to be normal, and the control branch 120 outputs a selection signal for selecting the first signal segment as the target signal segment to the selection circuit 200; otherwise, the first display signal is indicated to be abnormal, and the judging branch 110 returns to judge whether the level state of the second display signal changes within the preset time length and whether the characteristic index of the second display signal is the same as that of the preset display signal; the loop is repeated until the judging branch 110 judges that the level state of the second display signal or the first display signal changes within the preset time period, and the characteristic index of the second display signal or the first display signal is the same as that of the preset display signal.

It should be understood that the foregoing implementation is merely a preferred implementation of the embodiments of the present application, and is not the only limitation of the embodiment of the present application to the determination logic of the determination branch 110; in this regard, those skilled in the art may flexibly set according to the actual application scenario on the basis of the embodiments of the present application. Furthermore, the above embodiment relates to two types of judging modes of the judging branch 110, namely, the first judging mode and the second judging mode; the first judging mode is to judge the first display signal and then judge the second display signal; the second judging mode is to judge the second display signal and then judge the first display signal.

In some embodiments, please further refer to fig. 6, fig. 6 is a fifth block diagram of an LED driving device according to an embodiment of the present application. As shown in fig. 6, the first transmission channel 400 may include a first input terminal 410, a first output terminal 430, and a first processing circuit 420; the first input terminal 410 is connected to the first output terminal 430 through the first processing circuit 420. Specifically, the first input terminal 410 is configured to receive a first display signal sent by the first output terminal 430 of the front-stage LED driving device; the first processing circuit 420 is configured to obtain a first signal segment from the first display signal; the first output terminal 430 is used for transmitting the first display signal to the first input terminal 410 of the post-stage LED driving device. It will be appreciated that the first input terminal 410 and the first output terminal 430 should be sequentially arranged along the direction in which the first display signal is transmitted by the first transmission channel 400.

Accordingly, the second transmission channel 500 may also include a second input terminal 510, a second output terminal 530, and a second processing circuit 520; wherein the second input terminal 510 is connected to the second output terminal 530 through the second processing circuit 520. Specifically, the second input terminal 510 is configured to receive a second display signal sent by the second output terminal 530 of the front-stage LED driving device; the second processing circuit 520 is configured to obtain a second signal segment from the second display signal; the second output 530 is used for transmitting a second display signal to the second input 510 of the rear LED driving device. It will be appreciated that the second input terminal 510 and the second output terminal 530 should also be sequentially arranged in the direction in which the second display signal is transmitted by the second transmission channel 500.

As an implementation manner, please further refer to fig. 7, fig. 7 is a sixth block diagram of an LED driving device according to an embodiment of the present application. As shown in fig. 7, the first processing circuit 420 may include a first shaping branch 421, a first intercepting branch 422, and a first regenerating branch 423; the first shaping branch 421, the first intercepting branch 422, and the first regenerating branch 423 are electrically connected in sequence along the direction in which the first transmission channel 400 transmits the first display signal. Specifically, the first shaping branch 421 is configured to shape the first display signal; the first intercepting branch 422 is configured to intercept the shaped first display signal to obtain a first signal segment and a first residual signal segment; the first regeneration branch 423 is configured to regenerate the first remaining signal segment to retrieve the first display signal, so as to transmit the retrieved first display signal to the first input terminal 410 of the post-stage LED driving device through the first output terminal 430.

Accordingly, the second processing circuit 520 may also include a second shaping leg 521, a second intercepting leg 522, and a second regenerating leg 523; the second shaping branch 521, the second intercepting branch 522, and the second regenerating branch 523 are electrically connected in sequence along the direction in which the second transmission channel 500 transmits the second display signal. Specifically, the second shaping branch 521 is configured to shape the second display signal; the second intercepting branch 522 is configured to intercept the shaped second display signal to obtain a second signal segment and a second residual signal segment; the second regeneration branch 523 is configured to regenerate the second remaining signal segment to retrieve the second display signal, so as to transmit the retrieved second display signal to the second input terminal 510 of the post-stage LED driving device through the second output terminal 530.

It should be understood that the above-described implementation is merely a preferred implementation of the present application embodiment, and is not the only limitation of the specific configuration of the first processing circuit 420 and the second processing circuit 520 by the present application embodiment; in this regard, those skilled in the art may flexibly set according to the actual application scenario on the basis of the embodiments of the present application.

Referring to fig. 8, fig. 8 is a block diagram of a first module of a multi-stage LED driving system according to an embodiment of the present application. As shown in fig. 8, the multi-stage LED driving system provided in the embodiment of the present application includes a plurality of LED driving devices provided in the embodiment of the present application that are cascaded one after the other (i.e., 1, k, i-1, i, i+1, k, n, where 1 and i are positive integers, and 1 < i < n); wherein the first transmission channels 400 in the respective LED driving devices are connected to each other, and the second transmission channels 500 in the respective LED driving devices are connected to each other. It will be appreciated that the purpose of the first transmission channels 400 in each LED driving device is to interconnect: so that the first transmission channels 400 in the respective LED driving devices commonly transmit the first display signal. Similarly, the second transmission channels 500 in the respective LED driving devices are connected to each other for the purpose of: so that the second transmission channel 500 in each LED driving device commonly transmits the second display signal.

In this embodiment of the present application, the direction in which the first transmission channel 400 in each LED driving device transmits the first display signal is the first transmission direction x, and the direction in which the second transmission channel 500 in each LED driving device transmits the second display signal is the second transmission direction y. Hereinafter, the operation of the multi-stage LED driving system provided in the embodiment of the present application will be described in detail by taking the case that the first judging mode is adopted by the judging branches 110 of all the LED driving devices in the multi-stage LED driving system.

For this transmission scenario, taking the LED driving device i as the current LED driving device, when the power line and/or the ground line of the LED driving device i-1 are open, and/or the inside of the LED driving device i-1 is damaged, and/or the power line and the ground line of the other LED driving devices are not open, it is assumed that the first output terminal 430 of the LED driving device i-1 outputs the wrong first display signal to the first input terminal 410 of the LED driving device i, and the second output terminal 530 of the LED driving device i-1 outputs the correct second display signal to the second input terminal 510 of the LED driving device i-2, this means that the first transmission channels 400 of all LED driving devices between the LED driving device i-1 and the LED driving device n all transmit the wrong first display signal, the first transmission channels 400 of all LED driving devices between the LED driving device i-1 and the LED driving device i-2 all transmit the correct first display signal, and the second transmission channels 500 of all LED driving devices between the LED driving device i-1 and the LED driving device n all transmit the correct second display signal to the second input terminal 510 of the LED driving device i-2. At this time, for all LED driving devices from the LED driving device i to the LED driving device n, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is wrong, and the judging branch 110 of each LED driving device further judges whether the second display signal received by the second input end 510 is abnormal, and the obtained judging result is that the second display signal received by the second input end 510 is normal (this indicates that the second signal segment cut out by the second cutting branch 522 from the second display signal is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the second signal segment cut out by the second cutting branch 522 as the target signal segment, thereby ensuring that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. For all LED driving devices from the LED driving device 1 to the LED driving device i-2, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. Therefore, the remaining LED driving devices are in a normal state except that the LED driving device i-1 is in an abnormal state.

Assuming that the first output 430 of the LED driving device i-1 outputs the correct first display signal to the first input 410 of the LED driving device i and the second output 530 of the LED driving device i-1 outputs the incorrect second display signal to the second input 510 of the LED driving device i-2, this means that the first transmission channels 400 of all LED driving devices between the LED driving device i-n all transmit the correct first display signal, the first transmission channels 400 of all LED driving devices between the LED driving device 1-i-2 all transmit the correct first display signal, the second transmission channels 500 of all LED driving devices between the LED driving device i-n all transmit the correct second display signal, and the second transmission channels 500 of all LED driving devices between the LED driving device 1-i-2 all transmit the incorrect second display signal. At this time, for all LED driving devices from the LED driving device 1 to the LED driving device i-2, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out by the first cutting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. For all LED driving devices from the LED driving device i to the LED driving device n, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. Therefore, the remaining LED driving devices are in a normal state except that the LED driving device i-1 is in an abnormal state.

It is further assumed that the first output 430 of the LED driving device i-1 outputs the wrong first display signal to the first input 410 of the LED driving device i, and the second output 530 of the LED driving device i-1 also outputs the wrong second display signal to the second input 510 of the LED driving device i-2, which means that the first transmission channels 400 of all LED driving devices between the LED driving device i-n transmit the wrong first display signal, the first transmission channels 400 of all LED driving devices between the LED driving device 1-i-2 transmit the correct first display signal, the second transmission channels 500 of all LED driving devices between the LED driving device i-n transmit the correct second display signal, and the second transmission channels 500 of all LED driving devices between the LED driving device 1-i-2 transmit the wrong second display signal. At this time, for all LED driving devices from the LED driving device i to the LED driving device n, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is wrong, and the judging branch 110 of each LED driving device further judges whether the second display signal received by the second input end 510 is abnormal, and the obtained judging result is that the second display signal received by the second input end 510 is normal (this indicates that the second signal segment cut out by the second cutting branch 522 from the second display signal is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the second signal segment cut out by the second cutting branch 522 as the target signal segment, thereby ensuring that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. For all LED driving devices from the LED driving device 1 to the LED driving device i-2, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. Therefore, the remaining LED driving devices are in a normal state except that the LED driving device i-1 is in an abnormal state.

Of course, without being limited thereto, please further refer to fig. 9, fig. 9 is a block diagram of a second module of the multi-stage LED driving system according to the embodiment of the present application; in other embodiments, the direction in which the first transmission channel 400 in each LED driving device transmits the first display signal is the first transmission direction x, and the direction in which the second transmission channel 500 in each LED driving device transmits the second display signal is the first transmission direction x. Hereinafter, the operation of the multi-stage LED driving system provided in the embodiment of the present application will be described in detail by taking the first determination mode as an example of the determination branch 110 of all the LED driving devices in the multi-stage LED driving system.

For this transmission scenario, taking the LED driving device i as the current LED driving device, when the power line and/or the ground line of the LED driving device i-1 are open, and/or the interior of the LED driving device i-1 is damaged, and/or the power line and the ground line of the other LED driving devices are not open, it is assumed that the first output terminal 430 of the LED driving device i-1 outputs the wrong first display signal to the first input terminal 410 of the LED driving device i, and the second output terminal 530 of the LED driving device i-1 outputs the correct second display signal to the second input terminal 510 of the LED driving device i, this means that the first transmission channels 400 of all LED driving devices between the LED driving device i-1 and the LED driving device n all transmit the wrong first display signal, the first transmission channels 400 of all LED driving devices between the LED driving device i-1 and the LED driving device i-2 all transmit the correct first display signal, and the second transmission channels 500 of all LED driving devices between the LED driving device i-1 and the LED driving device n all transmit the correct second display signal to the second input terminal 510 of the LED driving device i-1. At this time, for all LED driving devices from the LED driving device i to the LED driving device n, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is wrong, and the judging branch 110 of each LED driving device further judges whether the second display signal received by the second input end 510 is abnormal, and the obtained judging result is that the second display signal received by the second input end 510 is normal (this indicates that the second signal segment cut out by the second cutting branch 522 from the second display signal is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the second signal segment cut out by the second cutting branch 522 as the target signal segment, thereby ensuring that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. For all LED driving devices from the LED driving device 1 to the LED driving device i-2, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. Therefore, the remaining LED driving devices are in a normal state except that the LED driving device i-1 is in an abnormal state.

It is further assumed that the first output 430 of the LED driving device i-1 outputs the correct first display signal to the first input 410 of the LED driving device i, and the second output 530 of the LED driving device i-1 outputs the incorrect second display signal to the second input 510 of the LED driving device i, which means that the first transmission channels 400 of all LED driving devices between the LED driving device i-n all transmit the correct first display signal, the first transmission channels 400 of all LED driving devices between the LED driving device 1-i-2 all transmit the correct first display signal, the second transmission channels 500 of all LED driving devices between the LED driving device i-n all transmit the incorrect second display signal, and the second transmission channels 500 of all LED driving devices between the LED driving device 1-i-2 all transmit the correct second display signal. At this time, for all LED driving devices from the LED driving device i to the LED driving device n, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. For all LED driving devices from the LED driving device 1 to the LED driving device i-2, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. Therefore, the remaining LED driving devices are in a normal state except that the LED driving device i-1 is in an abnormal state.

It is further assumed that the first output 430 of the LED driving device i-1 outputs the wrong first display signal to the first input 410 of the LED driving device i, and the second output 530 of the LED driving device i-1 also outputs the wrong second display signal to the second input 510 of the LED driving device i, which means that the first transmission channels 400 of all LED driving devices between the LED driving device i-n transmit the wrong first display signal, the first transmission channels 400 of all LED driving devices between the LED driving device 1-i-2 transmit the correct first display signal, the second transmission channels 500 of all LED driving devices between the LED driving device i-n transmit the wrong second display signal, and the second transmission channels 500 of all LED driving devices between the LED driving device 1-i-2 transmit the correct second display signal. At this time, for all LED driving apparatuses from the LED driving apparatus i to the LED driving apparatus n, the judging branch 110 of each LED driving apparatus judges that the first display signal received by the first input terminal 410 is wrong, and the judging branch 110 of each LED driving apparatus further judges whether the second display signal received by the second input terminal 510 is abnormal, and the obtained judging result is that the second display signal received by the second input terminal 510 is abnormal (this means that the second signal segment cut out by the second cutting branch 522 from the second display signal is abnormal), so that the judging branch 110 of each LED driving apparatus returns to judge whether the first display signal received by the first input terminal 410 is abnormal, which is circulated. For all LED driving devices from the LED driving device 1 to the LED driving device i-2, the judging branch 110 of each LED driving device judges that the first display signal received by the first input end 410 is correct (this indicates that the first signal segment cut out from the first display signal by the first cutting branch 422 is normal), so that the control branch 120 of each LED driving device controls the selecting circuit 200 to select the first signal segment cut out by the first cutting branch 422 as the target signal segment, and further ensures that the driving circuit 300 of each LED driving device can output the driving signal to the corresponding LED to be driven according to the normal target signal segment. Therefore, all the LED driving devices between the LED driving devices i-1 to n are in an abnormal state, and all the LED driving devices between the LED driving devices 1 to i-2 are in a normal state. However, all the LED driving apparatuses i-1 to n are not always in the abnormal state, and when the judging branch 110 of each LED driving apparatus judges that the first display signal received by the first input terminal 410 is correct (this means that the first signal segment cut out from the first display signal by the first cut-out branch 422 is normal), or that the second display signal received by the second input terminal 510 is correct (this means that the second signal segment cut out from the second display signal by the second cut-out branch 522 is normal), all the LED driving apparatuses i-1 to n are shifted from the abnormal state to the normal state.

Alternatively, referring to fig. 10 further, fig. 10 is a block diagram of a third module of the multi-stage LED driving system according to the embodiment of the present application; in other embodiments, the direction in which the first transmission channel 400 in each LED driving device transmits the first display signal is the second transmission direction y, and the direction in which the second transmission channel 500 in each LED driving device transmits the second display signal is the second transmission direction y. For such a transmission scenario, the working process of the multi-stage LED driving system provided in this embodiment of the present application is similar to the working process when the transmission scenario is that "the direction in which the first transmission channel 400 in each LED driving device transmits the first display signal is the first transmission direction x", and the direction in which the second transmission channel 500 in each LED driving device transmits the second display signal is also the first transmission direction x ", which is not described herein again.

In some embodiments, please further refer to fig. 11, fig. 11 is a fourth block diagram of a multi-stage LED driving system according to an embodiment of the present application. As shown in fig. 11, the multi-stage LED driving system provided in the embodiment of the present application may further include a first controller 600 and a second controller 700; the first controller 600 is disposed at a head end of the multi-stage LED driving system, the second controller 700 is disposed at a tail end of the multi-stage LED driving system opposite to the head end, the first transmission channel 400 and the second transmission channel 500 of the LED driving device (i.e., the LED driving device 1 in fig. 11) disposed at the head end are connected to the first controller 600, and the first transmission channel 400 and the second transmission channel 500 of the LED driving device (i.e., the LED driving device n in fig. 11) disposed at the tail end are connected to the second controller 700.

Specifically, the first controller 600 and the second controller 700 are each used to control n LED driving devices in a multi-stage LED driving system. Taking the first controller 600 as an example, the functions may include, but are not limited to, transmitting the first display signal to the second controller 700 through the first transmission channels 400 of the n LED driving devices in the multi-stage LED driving system, or receiving the first display signal transmitted from the second controller 700 through the first transmission channels 400 of the n LED driving devices in the multi-stage LED driving system; and transmitting the second display signal to the second controller 700 through the second transmission channels 500 of the n LED driving devices in the multi-stage LED driving system, or receiving the second display signal transmitted from the second controller 700 through the second transmission channels 500 of the n LED driving devices in the multi-stage LED driving system. Accordingly, the second controller 700 is also present.

Referring to fig. 12, fig. 12 is a flowchart of an LED driving method according to an embodiment of the present application. As shown in fig. 12, the embodiment of the present application further provides an LED driving method, which is applied to the LED driving device provided in the embodiment of the present application, and the LED driving method includes the following steps 1201 to 1205.

Step 1201, the first transmission channel receives the first display signal sent by the front-stage LED driving device, acquires a first signal segment from the first display signal, and transmits the first display signal to the rear-stage LED driving device.

In this embodiment of the present application, when the LED driving device provided in this embodiment of the present application is used to drive a corresponding LED to be driven, it is necessary to receive, through the first transmission channel 400, a first display signal sent by the front-stage LED driving device, obtain a first signal segment from the received first display signal, and then transmit the first display signal to the rear-stage LED driving device.

Step 1202, the second transmission channel receives the second display signal sent by the front-stage LED driving device, acquires a second signal segment from the second display signal, and transmits the second display signal to the rear-stage LED driving device.

In this embodiment of the present application, while the first transmission channel 400 performs the related operation, it is further required to receive the second display signal sent by the front-stage LED driving device through the second transmission channel 500, obtain the second signal segment from the received second display signal, and then transmit the second display signal to the rear-stage LED driving device.

Step 1203, the judging circuit judges whether the first display signal and/or the second display signal is abnormal, and outputs a selection signal to the selecting circuit according to the judging result.

In this embodiment, after the first transmission channel 400 and the second transmission channel 500 perform the related operation, the judging circuit 100 is further required to judge whether the first display signal transmitted by the first transmission channel 400 and/or the second display signal transmitted by the second transmission channel 500 are abnormal, and output a selection signal to the selecting circuit 200 according to the judging result; wherein the selection signal is used to instruct the selection circuit 200 to select between the first signal segment and the second signal segment.

In step 1204, the selection circuit selects the first signal segment or the second signal segment as the target signal segment according to the selection signal, and transmits the target signal segment to the driving circuit.

In this embodiment of the present application, after receiving the selection signal output by the determining circuit 100 according to the determination result, the selecting circuit 200 further needs to select the first signal segment or the second signal segment as the target signal segment according to the received selection signal, and transmit the selected target signal segment to the driving circuit 300; the target signal segment is used for providing a reference for the driving circuit 300 to output a driving signal for driving the LED to be driven.

In step 1205, the driving circuit outputs a driving signal to the LED to be driven according to the target signal segment.

In this embodiment of the present application, after receiving the target signal segment output by the selection circuit 200 according to the selection signal, the driving circuit 300 further outputs a driving signal to the LED to be driven according to the received target signal segment, so as to drive the LED to be driven to emit light. It can be understood that, after the driving circuits 300 of all the LED driving devices in the multi-stage LED driving system output corresponding driving signals according to the target signal segments received by the driving circuits 300, all the LEDs to be driven connected to the driving circuits 300 of all the LED driving devices in the multi-stage LED driving system emit light, so as to realize the picture display function of the LED display device.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line), or wireless (e.g., infrared, wireless, microwave, etc.). Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk), etc.

It should be noted that, in the present application, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and the same or similar parts between the embodiments are referred to each other. For the method class embodiments, since they are based on the same inventive concept as the product class embodiments, the description is relatively simple, and the relevant points are referred to the description of the corresponding parts of the product class embodiments.

It should also be noted that in the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The LED driving device is characterized by comprising a judging circuit, a selecting circuit, a driving circuit, a first transmission channel and a second transmission channel; the judging circuit and the selecting circuit are respectively connected with the first transmission channel, the judging circuit and the selecting circuit are also respectively connected with the second transmission channel, the judging circuit is connected with the selecting circuit, the selecting circuit is connected with the driving circuit, and the driving circuit is used for connecting an LED to be driven;

the judging circuit comprises a judging branch circuit and a control branch circuit, wherein:

the judging branch circuit is used for judging whether the level state of the first display signal changes within a preset time period and whether the characteristic index of the first display signal is the same as that of the preset display signal, and returning to judge whether the level state of the first display signal changes within the preset time period and whether the characteristic index of the first display signal is the same as that of the preset display signal when the level state of the first display signal does not change within the preset time period and/or the characteristic index of the first display signal is different from that of the preset display signal, and whether the level state of the second display signal changes within the preset time period and whether the characteristic index of the second display signal is the same as that of the preset display signal when the level state of the second display signal does not change within the preset time period and/or the characteristic index of the second display signal is different from that of the preset display signal; if the level state of the first display signal changes within the preset time period and the characteristic index of the first display signal is the same as that of the preset display signal, the first display signal is normal, otherwise, the first display signal is abnormal; if the level state of the second display signal changes within the preset time period and the characteristic index of the second display signal is the same as that of the preset display signal, the second display signal is normal, otherwise, the second display signal is abnormal;

The control branch is used for outputting a selection signal for selecting the first signal section as a target signal section to the selection circuit when the first display signal is normal, or outputting a selection signal for selecting the second signal section as the target signal section to the selection circuit when the second display signal is normal;

2. The LED driving device of claim 1, wherein the first transmission channel comprises a first input, a first output, and a first processing circuit; the first input end is connected to the first output end through the first processing circuit;

the first input end is used for receiving the first display signal sent by the front-stage LED driving device;

the first processing circuit is used for acquiring the first signal segment from the first display signal;

the first output end is used for transmitting the first display signal to the rear-stage LED driving device.

3. The LED driving device of claim 2, wherein the first processing circuit comprises a first shaping branch, a first clipping branch, and a first regenerating branch;

the first shaping branch is used for shaping the first display signal;

the first intercepting branch is used for intercepting the shaped first display signal to obtain the first signal section and a first residual signal section;

the first regeneration branch is used for regenerating the first residual signal segment to obtain the first display signal.

4. The LED driving device of claim 1, wherein the second transmission channel comprises a second input, a second output, and a second processing circuit; the second input end is connected to the second output end through the second processing circuit;

the second input end is used for receiving the second display signal sent by the front-stage LED driving device;

the second processing circuit is used for acquiring the second signal segment from the second display signal;

the second output end is used for transmitting the second display signal to the rear-stage LED driving device.

5. The LED driving device of claim 4, wherein the second processing circuit comprises a second shaping branch, a second intercepting branch, and a second regenerating branch;

The second shaping branch is used for shaping the second display signal;

the second intercepting branch is used for intercepting the shaped second display signal to obtain the second signal section and a second residual signal section;

and the second regeneration branch is used for regenerating the second residual signal section to obtain the second display signal.

6. A multi-stage LED driving system comprising a plurality of LED driving devices as claimed in any one of claims 1-5 in tandem; wherein the first transmission channels in the LED driving devices are connected with each other, and the second transmission channels in the LED driving devices are connected with each other.

7. The multi-stage LED driving system of claim 6, further comprising a first controller and a second controller; the first controller is arranged at the head end of the multi-stage LED driving system, the second controller is arranged at the tail end of the multi-stage LED driving system opposite to the head end, the first transmission channel and the second transmission channel of the LED driving device at the head end are both connected to the first controller, and the first transmission channel and the second transmission channel of the LED driving device at the tail end are both connected to the second controller.

8. The LED driving method is applied to an LED driving device and is characterized by comprising a judging circuit, a selecting circuit, a driving circuit, a first transmission channel and a second transmission channel; the judging circuit and the selecting circuit are respectively connected with the first transmission channel, the judging circuit and the selecting circuit are respectively connected with the second transmission channel, the judging circuit is connected with the selecting circuit, the selecting circuit is connected with the driving circuit, the driving circuit is used for connecting an LED to be driven, and the judging circuit comprises a judging branch circuit and a control branch circuit;

the LED driving method comprises the following steps:

the judging branch circuit judges whether the level state of the first display signal changes within a preset time period and whether the characteristic index of the first display signal is the same as that of the preset display signal, and returns to judge whether the level state of the first display signal changes within the preset time period and whether the characteristic index of the first display signal is the same as that of the preset display signal when the level state of the first display signal does not change within the preset time period and/or the characteristic index of the first display signal is different from that of the preset display signal, and whether the level state of the second display signal changes within the preset time period and the characteristic index of the second display signal is the same as that of the preset display signal when the level state of the second display signal does not change within the preset time period and/or the characteristic index of the second display signal is different from that of the preset display signal; if the level state of the first display signal changes within the preset time period and the characteristic index of the first display signal is the same as that of the preset display signal, the first display signal is normal, otherwise, the first display signal is abnormal; if the level state of the second display signal changes within the preset time period and the characteristic index of the second display signal is the same as that of the preset display signal, the second display signal is normal, otherwise, the second display signal is abnormal;

The control branch circuit outputs a selection signal for selecting the first signal section as a target signal section to the selection circuit when the first display signal is normal, or outputs a selection signal for selecting the second signal section as the target signal section to the selection circuit when the second display signal is normal;