WO2023151703A1

WO2023151703A1 - Led driving apparatus, multi-stage led driving system and led driving method

Info

Publication number: WO2023151703A1
Application number: PCT/CN2023/086643
Authority: WO
Inventors: 李家栋; 黄建东; 张青松
Original assignee: 深圳市绿源半导体技术有限公司
Priority date: 2022-02-08
Filing date: 2023-04-06
Publication date: 2023-08-17
Also published as: CN114241984B; CN114241984A

Abstract

Provided in the present application are an LED driving apparatus, a multi-stage LED driving system and an LED driving method. The LED driving apparatus comprises a determination circuit, a selection circuit, a driving circuit, a first transmission channel and a second transmission channel, wherein 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 determination circuit is used for determining whether the first display signal and/or the second display signal are/is abnormal, and outputting a selection signal to the selection circuit according to a determination 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; and the driving circuit is used for outputting, according to the target signal segment, a driving signal to an LED to be driven. The present application can effectively improve the reliability of the multi-stage LED driving system.

Description

A kind of LED driving device, multi-level LED driving system and driving method

technical field

The present 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 technique

A multi-level LED (Light-Emitting Diode, light-emitting diode) driving system is usually applied to an LED display device including many LEDs, which generally includes a plurality of cascaded LED driving devices before and after, and each LED driving device is used to transmit display signals. And outputting a driving signal according to the transmitted display signal to drive the corresponding at least one LED to emit light, so as to realize the display function of the LED display device.

In the related art, each LED driving device is connected to the ground through a ground wire, and connected to a power source through a power wire. When the power line and/or ground wire of the target LED driving device is open, and/or the interior of the target LED driving device is damaged, the target LED driving device is likely to output a wrong display signal to the subsequent LED driving device (rear LED The drive device will still output the wrong display signal due to receiving the wrong display signal, and so on), and because each LED drive device does not have the ability to judge whether the transmitted display signal is correct, so the latter The display signals transmitted by all the LED driving devices of the second stage are wrong, which causes all the LED driving devices of the subsequent stage to be in an abnormal state, such as being unable to output the driving signal or the output driving signal is abnormal, etc. All the LEDs connected to the driving device cannot emit light or emit light abnormally, which leads to the failure of the LED display device to display images normally, which also means that the reliability of the existing multi-level LED driving system is low.

Therefore, it is necessary to improve the structure of the above-mentioned LED driving device.

technical problem

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

technical solution

In order to solve the above technical problems, the first aspect of the embodiment of the present application provides an LED driving device, including a judging circuit, a selection circuit, a driving circuit, a first transmission channel, and a second transmission channel; wherein, the judging circuit and the The selection circuits are respectively connected to the first transmission channel, the judgment circuit and the selection circuit are respectively connected to the second transmission channel, the judgment circuit is connected to the selection circuit, and the selection circuit is connected to the selection circuit. Described driving circuit, described driving circuit is used for connecting LED to be driven;

The first transmission channel is used to receive the first display signal sent by the front-stage LED driving device, obtain a first signal segment from the first display signal, and transmit the first display signal to the rear-stage LED driver device;

The second transmission channel is used 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 Post-stage LED drive device;

The judgment circuit is used to judge whether the first display signal and/or the second display signal are abnormal, and output a selection signal to the selection circuit according to the judgment result;

The selection circuit is used 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;

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

The second aspect of the embodiment of the present application provides a multi-stage LED driving system, including a plurality of LED driving devices cascaded forward and backward as described in the first aspect of the embodiment of the present application; wherein, all the LED driving devices in each of the LED driving devices The first transmission channels are connected to each other, and the second transmission channels in each of the LED driving devices are connected to each other.

The third aspect of the embodiment of the present application provides an LED driving method, which is applied to an LED driving device; the LED driving device includes a judgment circuit, a selection circuit, a driving circuit, A first transmission channel and a second transmission channel; wherein, the judgment circuit and the selection circuit are respectively connected to the first transmission channel, and the judgment circuit and the selection circuit are also respectively connected to the second transmission channel , the judgment circuit is connected to the selection circuit, the selection circuit is connected to the drive circuit, and the drive circuit is used to connect to the LED to be driven;

The LED driving method includes:

The first transmission channel receives the first display signal sent by the preceding LED driving device, obtains a first signal segment from the first display signal, and transmits the first display signal to the subsequent LED driving device;

The second transmission channel receives the second display signal sent by the front-stage LED driving device, obtains a second signal segment from the second display signal, and transmits the second display signal to the subsequent stage LED driver;

The judgment circuit judges whether the first display signal and/or the second display signal are abnormal, and outputs a selection signal to the selection circuit according to the judgment 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;

The driving circuit outputs a driving signal to the LED to be driven according to the target signal segment.

Beneficial effect

As can be seen from the above description, compared with related technologies, the beneficial effects of the present application are:

When the power line and/or ground line of the previous LED driving device is open, and/or the interior of the previous LED driving device is damaged, the first transmission channel of the previous LED driving device may output a wrong first display signal to the current LED The first transmission channel of the driving device; similarly, the second transmission channel of the preceding LED driving device may also output a wrong second display signal to the second transmission channel of the current LED driving device.

If the current LED driving device is a traditional LED driving device, then the wrong first display signal is received in the first transmission channel of the current LED driving device (at this time, the first signal segment obtained from the first display signal is also wrong ), and/or current LED When the second transmission channel of the 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 will directly One signal segment or the wrong second signal segment to output the driving signal, which will cause the driving circuit to fail to output the driving signal or output the abnormal driving signal, so that the current LED driving device is in an abnormal state.

If the current LED driving device is the LED driving device described in the first aspect of the embodiment of the present application, then the wrong first display signal is received in the first transmission channel of the current LED driving device (at this time, it is obtained from the first display signal The first signal segment 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) At this time, the driving circuit of the current LED driving device will not directly output the driving signal according to the wrong first signal segment or the wrong second signal segment, but first pass the judgment circuit to the first display signal received by the first transmission channel and/or Or judge whether the second display signal received by the second transmission channel is abnormal, and then control the selection circuit to select the first signal segment or the second signal segment as the target signal segment according to the judgment result, so that the drive circuit outputs the signal according to the selected target signal segment drive signal to drive the corresponding LED to be driven. It can be understood that, in order to ensure that the drive signal output by the drive circuit is normal, the target signal segment based on the drive circuit must be normal, that is, the judgment circuit controls the selection circuit to select from the first signal segment and the second signal segment according to the judgment result. The signal segment and the corresponding display signal must be normal, so that the current LED drive device can be prevented from being in an abnormal state (that is, the drive circuit of the current LED drive device can be prevented from outputting the drive signal according to the wrong signal segment), and the multi-level LED driver can be effectively improved. Reliability of LED drive system.

Description of drawings

In order to more clearly illustrate the related technologies or the technical solutions in the embodiments of the present application, the following The accompanying drawings that need to be used in the description of related technologies or the embodiments of the present application will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, not all embodiments. For the present application Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Figure 1 is a block diagram of a traditional multi-level LED drive system;

FIG. 2 is a first module block diagram of the LED driving device provided by the embodiment of the present application;

FIG. 3 is a second module block diagram of the LED driving device provided by the embodiment of the present application;

FIG. 4 is a block diagram of a third module of an LED driving device provided in an embodiment of the present application;

FIG. 5 is a block diagram of a fourth module of an LED driving device provided in an embodiment of the present application;

FIG. 6 is a fifth module block diagram of the LED driving device provided by the embodiment of the present application;

FIG. 7 is a sixth module block diagram of the LED driving device provided by the embodiment of the present application;

FIG. 8 is a block diagram of the first type of module of the multi-level LED driving system provided by the embodiment of the present application;

FIG. 9 is a block diagram of the second type of module of the multi-level LED driving system provided by the embodiment of the present application;

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

Fig. 11 is a block diagram of the fourth module of the multi-level LED driving system provided by the embodiment of the present application;

FIG. 12 is a schematic flowchart of an LED driving method provided by an embodiment of the present application.

Embodiments of the present invention

In order to make the purpose, technical solutions and advantages of the application more obvious and understandable, the following will clearly and completely describe the application in conjunction with the embodiments of the application and the corresponding drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. It should be understood that the various embodiments of the application described below are only used to explain the application, and are not intended to limit the application, that is, based on the various embodiments of the application, those skilled in the art will not make an inventive step. before labor All other embodiments obtained under the mention all belong to the protection scope of the present application. In addition, the technical features involved in the various 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 a multi-level LED driving system is connected to the ground through a ground wire, and connected to a power source through a power wire. When the power line and/or ground wire of the target LED driving device is open, and/or the interior of the target LED driving device is damaged, the target LED driving device is likely to output a wrong display signal to the subsequent LED driving device (rear LED The drive device will still output the wrong display signal due to receiving the wrong display signal, and so on), and because each LED drive device does not have the ability to judge whether the transmitted display signal is correct, so the latter The display signals transmitted by all the LED driving devices of the second stage are wrong, which causes all the LED driving devices of the subsequent stage to be in an abnormal state, such as being unable to output the driving signal or the output driving signal is abnormal, etc. All the LEDs connected to the driving device cannot emit light or emit light abnormally, thereby causing the LED display device to fail to display images normally, which also means that the reliability of the traditional multi-level LED driving system is low. To this end, embodiments of the present application provide an LED driving device and a multi-stage LED driving system using the LED driving device.

Before describing in detail the LED driving device and the multi-level LED driving system provided by the embodiments of the present application, a brief description of the traditional multi-level LED driving system will be given first. Please refer to Figure 1, Figure 1 is a block diagram of a traditional multi-level LED drive system; where, u represents the first signal transmission direction, v represents the second signal transmission direction, VDD represents the power line, GND represents the ground wire, each " Each box "represents an LED driving device (ie 1,..., a-1, a, a+1,...m), m and a are both positive integers, and 1<a<m.

Specifically, both 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 terminals, which are respectively first signal input terminals (indicated by di1) , the first signal output end (indicated by do1), the second signal input end (indicated by di2) and the second signal output end (indicated by do2); Wherein, the first signal input terminal di1 and the first signal output terminal do1 are used to transmit display signals in the first signal transmission direction u, and the second signal input terminal di2 and the second signal output terminal do2 are used to transmit display signals in the second signal transmission direction The display signal is transmitted in v, and the display signal transmitted in the first signal transmission direction u may be the same as or different from the display signal transmitted in the second signal transmission direction v.

In practical application, the LED driving device a is used as the target LED driving device. When the first signal output terminal do1 of the LED driving device a is disconnected, the first signal output terminal do1 of the LED driving device a cannot output the display signal, that is, the LED The first signal input terminal di1 of the driving device a+1 cannot receive the display signal, at this time, the LED driving device a+1 will switch the signal input terminal, that is, receive the second signal of the LED driving device a through the second signal input terminal di2 The display signal output by the output terminal do2 ensures that the LED driving device a+1 will not be in an abnormal state, thereby slightly improving the reliability of the multi-level LED driving system; similarly, when the second signal output of the LED driving device a The same is true when terminal do2 is disconnected. However, when the power line VDD and/or the ground line GND of the LED driving device a are open, and/or the interior 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 are both It is possible to output a wrong display signal, assuming that the first signal output terminal do1 of the LED driving device a outputs a wrong display signal, that is, the first signal input terminal di1 of the LED driving device a+1 receives a wrong display signal, at this time Because the LED driving device a+1 does not have the ability to judge the correctness of the display signal received by its first signal input terminal di1, and the first signal input terminal di1 of the LED driving device a+1 is not in the "not received display signal", so the LED driver a+1 will not switch the signal input terminal, that is, it will not receive the display signal through its second signal input terminal di2, which causes the LED driver a+1 to pass its first signal The wrong display signal received by the input terminal di1 drives the corresponding LED, and transmits the wrong display signal to the first signal input terminal di1 of the LED driving device a+2 through its first signal output terminal do1, and so on, so that As a result, all LED driving devices between LED driving device a+1 and LED driving device m transmit wrong display signals, and all pass the wrong display signal. Wrong display signals drive their respective LEDs, so that all LED driving devices between LED driving device a+1 and LED driving device m are in an abnormal state, thereby greatly reducing the reliability of the multi-level LED driving system; similarly, The same is true when the second signal output terminal do2 of the LED driving device a outputs a wrong display signal. This is why the embodiments of the present application provide an LED driving device and a multi-stage LED driving system using the LED driving device.

Please refer to FIG. 2 . FIG. 2 is a first module block diagram of the LED driving device provided by the embodiment of the present application. As shown in Figure 2, the LED driving device provided by the embodiment of the present application includes a judgment circuit 100, a selection circuit 200, a drive circuit 300, a first transmission channel 400, and a second transmission channel 500; wherein, the judgment circuit 100 and the selection circuit 200 are respectively Connected to the first transmission channel 400, the judgment circuit 100 and the selection circuit 200 are respectively connected to the second transmission channel 500, the judgment circuit 100 is connected to the selection circuit 200, the selection circuit 200 is connected to the drive circuit 300, and the drive circuit 300 is used to connect to the Drive the LEDs. It can be understood that when the LED driving device provided in the embodiment of the present application is applied to a multi-level LED driving system, each LED driving device in the multi-level LED driving system is the LED driving device provided in the embodiment of the present application.

Specifically, the first transmission channel 400 is used to receive the first display signal sent by the preceding LED driving device (that is, the LED driving device before the current LED driving device), and obtain the first signal segment from the first display signal, and The first display signal is transmitted to the subsequent LED driving device (that is, the LED driving device located after the current LED driving device). The second transmission channel 500 is used to receive the second display signal sent by the front-stage LED driving device, obtain the second signal segment from the second display signal, and transmit the second display signal to the subsequent-stage LED driving device. The judgment circuit 100 is used to judge whether the first display signal and/or the second display signal are abnormal, and output a selection signal to the selection circuit 200 according to the judgment result. The selection circuit 200 is used to select the first signal segment or the second signal segment as the target signal segment according to the selection signal, and transmit the target signal segment to the driving circuit 300 . The drive circuit 300 is used to output a drive signal to the LED to be driven according to the target signal segment; wherein, the drive signal It may include but not limited to three-color driving signals of R, G, and B. Here, it needs to be explained 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 integral display signals corresponding to all LED driving devices in the multi-level LED driving system, that is, all LED driving devices in the multi-level LED driving system only use the first display signal respectively Or a different signal segment in the second display signal. Therefore, the first transmission channel 400 of each LED driving device in the multi-level LED driving system needs to obtain the corresponding first signal segment from the first display signal. Similarly, each LED driving device in the multi-level LED driving system The second transmission channel 500 of the device also needs to obtain the corresponding second signal segment from the second display signal.

Further, it can be seen from the aforementioned "judging circuit 100 is used to judge 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 situations, one is only judging the first display signal One is to show whether the signal is abnormal, the other is to only judge whether the second display signal is abnormal, and the third is to judge whether the first display signal is abnormal or not, and to judge whether the second display signal is abnormal. It can be understood that, in order to ensure that the LED driving device will not be in an abnormal state (that is, to ensure that the display signal transmitted by the LED driving device is correct, or in other words, to ensure that the signal segment used by the LED driving device is correct), the judgment circuit 100 controls The signal segment selected by the selection circuit 200 from the first signal segment and the second signal segment and the corresponding display signal must be correct. Based on this, if the judging circuit 100 first 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 judgment result indicates that the first display signal is correct (equivalent to indicating that the first signal segment is correct), then there is no need to judge the correctness of the second display signal (equivalent to no need to judge the correctness of the second signal segment), at this time directly transmit and use the first The signal segment is sufficient, and this is the case where only the first display signal is judged to be abnormal. If the judging circuit 100 first 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 judgment result indicates that the second display signal is correct (equivalent to Indicates that the second signal segment is correct), that Then there is no need to judge the correctness of the first display signal (equivalent to no need to judge the correctness of the first signal segment), at this time, it is enough to directly transmit and use the second signal segment, which is to judge only the first signal segment The second shows whether the signal is abnormal. If the judgment circuit 100 first judges the correctness of the first display signal, and the judgment result indicates that the first display signal is abnormal, then it is necessary to judge the correctness of the second display signal, which is to judge whether the first display signal is Abnormal, and judge whether the second display signal is abnormal; correspondingly, when the judgment circuit 100 first judges the correctness of the second display signal, and the judgment result indicates that the second display signal is abnormal.

In practical applications, when the power line and/or ground line of the front-end LED drive device is open, and/or the interior of the front-end LED drive device is damaged, the first transmission channel 400 of the front-end LED drive device may output a wrong first A display signal is sent to the first transmission channel 400 of the current LED driving device; similarly, the second transmission channel 500 of the preceding LED driving device may also output a wrong second display signal to the second transmission channel 500 of the current LED driving device .

If the current LED driving device is a traditional LED driving device, then the wrong first display signal is received in the first transmission channel of the current LED driving device (at this time, the first signal segment obtained from the first display signal is also wrong ), and/or when the second transmission channel of the current LED driving device receives a wrong second display signal (at this time, the second signal segment obtained from the second display signal is also wrong), the driving of the current LED driving device The circuit will directly output the driving signal according to the wrong first signal segment or the wrong second signal segment, which will cause the driving circuit to fail to output the driving signal or output the abnormal driving signal, so that the current LED driving device is in an abnormal state.

If the current LED driving device is the LED driving device provided in the embodiment of the present application, then the first transmission channel 400 of the current LED driving device receives an incorrect first display signal (at this time, the first display signal obtained from the first display signal The signal segment is also wrong), and/or when the second transmission channel 500 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 300 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 passes the judgment circuit 100 to the first display signal received by the first transmission channel 400 and /or judge whether the second display signal received by the second transmission channel 500 is abnormal, and then control the selection circuit 200 to select the first signal segment or the second signal segment as the target signal segment according to the judgment result, so that the driving circuit 300 selects the first signal segment or the second signal segment according to the selected The target signal segment outputs a driving signal to drive a corresponding LED to be driven. It can be understood that in order to ensure that the drive signal output by the drive circuit 300 is normal, the target signal segment based on the drive circuit 300 must be normal, that is, the judgment circuit 100 controls the selection circuit 200 to select from the first signal segment and the second signal segment according to the judgment result. The selected signal segment and the corresponding display signal must be normal, so that the current LED driving device can be prevented from being in an abnormal state (that is, the driving circuit 300 of the current LED driving device can be prevented from outputting the driving signal according to the wrong signal segment), and then the LED driving device can be prevented from being in an abnormal state. Effectively improve the reliability of the multi-level LED drive system.

In some embodiments, please refer to FIG. 3 , which is a block diagram of a second module of an LED driving device provided in an embodiment of the present application. As shown in FIG. 3 , the judgment circuit 100 may include a judgment branch 110 and a control branch 120 . Specifically, the judging branch 110 is used 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. Abnormal; the control branch 120 is used 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 when the second display signal is normal. The selection signal of the target signal segment is sent to the selection circuit 200 .

It can be understood that, for this embodiment, the judgment logic of the judgment circuit 100 is as follows: the judgment branch 110 first judges whether the first display signal is abnormal; if the first display signal is normal, the control branch 120 outputs and selects the first signal segment as The selection signal of the target signal segment is sent to the selection circuit 200; if the first display signal is abnormal, then the judgment branch 110 judges whether the second display signal is abnormal; if the second display signal is normal, the control branch 120 outputs and selects the second display signal. The signal segment is sent to the selection circuit 200 as the selection signal of the target signal segment; if the second display signal is abnormal, then the judging branch 110 returns to judge whether the first display signal is abnormal; and so on, 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 both the first display signal and the second display signal are in an abnormal state within a certain period of time, the judging branch 110 will repeatedly perform correctness checks between the first display signal and the second display signal. judgment until it is judged that the first display signal or the second display signal is normal, or in other words, the LED driving device will repeatedly switch between the first transmission channel 400 and the second transmission channel 500 until the judging branch 110 judges that Until the first display signal or the second display signal is normal, that is, until it is determined that the first display signal transmitted by the first transmission channel 400 or the second display signal transmitted by the second transmission channel 500 is normal.

Of course, it is not limited thereto. In other embodiments, the judgment logic of the judgment circuit 100 may also be: the judgment branch 110 first judges whether the second display signal is abnormal; if the second display signal is normal, the control branch 120 outputs Select the second signal segment as the selection signal of the target signal segment to the selection circuit 200; if the second display signal is abnormal, then the judgment branch 110 judges whether the first display signal is abnormal; if the first display signal is normal, then the control branch 120 Output selects the selection signal of the first signal segment as the target signal segment to the selection circuit 200; if the first display signal is abnormal, then the judging branch 110 returns to judge whether the second display signal is abnormal; and so on, until the judging branch 110 judges that the second display signal is abnormal; Until the first display signal or the second display signal is normal.

In addition, still referring to FIG. 3 , in this 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 x. direction y. Of course, it is not limited thereto. In other embodiments, please refer to Fig. 4 and Fig. 5 further. The fourth module block diagram of the LED driving device; 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 can be uniform is the first transmission direction x, or both are the second transmission direction y.

As an implementation, the judging branch 110 can be specifically used to judge 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 the preset display signal, and in the second When the level state of a display signal does not change within the preset time period, and/or the characteristic index of the first display signal is different from the preset display signal, determine whether the level state of the second display signal occurs within the preset time length Whether the characteristic index of the change and the second display signal is the same as the preset display signal, and the level state of the second display signal has not changed within the preset time period, and/or the characteristic index of the second display signal is the same as the preset display signal When the signals are different, return to determine 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 the preset display signal. Among them, the preset display signal is defined by the user, which is a reference signal preset by the user according to his own needs. When the user's own needs change, the preset display signal will also change accordingly, which means that the preset display signal The signal is not static, that is, the preset display signal changes according to the user's own needs. "The level state of the display signal changes within the preset time period" means that within the preset time period, the display signal changes from high level to low level, or from low level to high level; correspondingly, "display The level state of the signal does not change within the preset time period" means that within the preset time period, the display signal remains at a high level or remains at a low level. In addition, the characteristic index of the first display signal may include but not limited to the amplitude, frequency, phase and timing of the first display signal; similarly, the characteristic index of the second display signal may include but not limited to the amplitude, frequency and frequency of the second display signal , phase and timing.

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

It can be understood that the method of judging whether the display signal is abnormal in this embodiment is: a combination of an analysis process and a comparison process; wherein, the analysis process is to analyze the change of the level state of the display signal within a preset time length , the comparison process is to compare the characteristic index of the displayed signal with the preset displayed signal. For this embodiment, the judgment logic of the judging branch 110 is as follows: the judging branch 110 first judges whether the level state of the first display signal changes within a preset time length and whether the characteristic index of the first display signal is consistent with the preset The display signals are the same; if the level state of the first display signal changes within a 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, and the control branch 120 Output the selection signal for selecting the first signal segment as the target signal segment to the selection circuit 200; otherwise, it indicates that the first display signal is abnormal, and at this time, the judgment 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 the preset display signal, it indicates The second display signal is normal, and now 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, it indicates that the second display signal is abnormal, and at this time, the judgment branch 110 returns to judge the first display signal Whether the level state of the level changes within the preset time length and whether the characteristic index of the first display signal is the same as the preset display signal; and so on, until the judgment branch 110 judges the level of the first display signal or the second display signal The state changes within a preset time period, and at the same time, the characteristic index of the first display signal or the second display signal is the same as the preset display signal.

Of course, it is not limited thereto. In other embodiments, the judgment logic of the judging branch 110 may also be: the judging branch 110 first judges whether the level state of the second display signal changes within a preset time period and the second Whether the characteristic index of the 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 the preset display signal, it indicates that the second display signal If the 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; otherwise, it indicates that the second display signal is abnormal, and the judgment branch 110 Then 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 the preset display signal; if the level state of the first display signal changes within the preset time length , 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, and at this time, 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, it indicates The first display signal is abnormal. At this time, the judgment 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 the preset display signal; and so on, until The judging branch 110 judges that the level state of the second display signal or the first display signal changes within a preset time period, and at the same time the characteristic index of the second display signal or the first display signal is the same as the preset display signal.

It should be understood that the above implementation is only a preferred implementation of the embodiment of the present application, and is not the only limitation of the judgment logic of the judgment branch 110 in the embodiment of the present application; On this basis, it can be flexibly set according to actual application scenarios. Moreover, the above-mentioned embodiment involves two types of judging modes of the judging branch 110, namely the first judging mode and the second judging mode; wherein, the first judging mode is to first judge the first display signal, and then judge the second display signal. The signal is judged; the second judgment mode is to judge the second display signal first, and then judge the first display signal.

In some embodiments, please refer to FIG. 6 , which is a block diagram of a fifth module of an LED driving device provided in 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; wherein, the first input terminal 410 is connected to the first output terminal through the first processing circuit 420 430. Specifically, the first input terminal 410 is used to receive the first display signal sent by the first output terminal 430 of the previous stage LED driving device; the first processing circuit 420 is used to obtain the first signal segment from the first display signal; the first The output terminal 430 is used to transmit the first display signal to the first input terminal 410 of the subsequent LED driving device. It can be understood that the first input terminal 410 and the first output terminal 430 should be arranged in sequence along the direction in which the first transmission channel 400 transmits the first display signal.

Correspondingly, 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 used to receive the second display signal sent by the second output terminal 530 of the previous stage LED driving device; the second processing circuit 520 is used to obtain the second signal segment from the second display signal; the second The output terminal 530 is used to transmit the second display signal to the second input terminal 510 of the subsequent LED driving device. It can be understood that the second input end 510 and the second output end 530 should also be arranged in sequence along the direction in which the second transmission channel 500 transmits the second display signal.

As an implementation manner, please refer to FIG. 7 , which is a block diagram of a sixth module of an LED driving device provided by 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 truncation branch 422 and a first regeneration branch 423; wherein, the first shaping branch 421, the first truncation branch 422 and The first regeneration branch 423 is electrically connected sequentially along the direction in which the first transmission channel 400 transmits the first display signal. Specifically, the first shaping branch 421 is used to shape the first display signal; the first intercepting branch 422 is used to intercept the shaped first display signal to obtain the first signal segment and the first remaining signal segment; The first regeneration branch 423 is used to regenerate the first remaining signal segment to re-obtain the first display signal, so as to transmit the re-obtained first display signal to the first input of the subsequent LED driving device through the first output terminal 430 Terminal 410.

Correspondingly, the second processing circuit 520 may also include a second shaping branch 521, a second truncation branch 522 and a second regeneration branch 523; wherein, the second shaping branch 521, the second truncation branch 522 and the second The regenerative branch 523 is electrically connected sequentially along the direction in which the second transmission channel 500 transmits the second display signal. Specifically, the second shaping branch 521 is used to shape the second display signal; the second intercepting branch 522 is used to intercept the shaped second display signal to obtain a second signal segment and a second remaining signal segment; The second regeneration branch 523 is used to regenerate the second remaining signal segment to re-obtain the second display signal, so as to transmit the re-obtained second display signal to the second input of the subsequent LED driving device through the second output terminal 530 Terminal 510.

It should be understood that the above-mentioned implementation is only a preferred implementation of the embodiment of the present application, and is not the only limitation of the specific configuration of the first processing circuit 420 and the second processing circuit 520 in the embodiment of the present application; in this regard, those skilled in the art Based on the embodiments of the present application, flexible settings can be made according to actual application scenarios.

Please refer to FIG. 8 . FIG. 8 is a first block diagram of a multi-level LED driving system provided by an embodiment of the present application. As shown in Figure 8, the multi-level LED driving system provided by the embodiment of the present application includes multiple LED driving devices provided by the embodiment of the present application cascaded back and forth (i.e. 1,...,i-1,i,i+1 ,...,n, and 1 and i are both positive integers, and 1<i<n); wherein, the first transmission channel 400 in each LED driving device is connected to each other, and the second transmission channel 400 in each LED driving device 500 interconnected. It can be understood that the purpose of connecting the first transmission channels 400 in each LED driving device is to make the first transmission channels 400 in each LED driving device jointly transmit the first display signal. Similarly, the purpose of connecting the second transmission channels 500 in each LED driving device is to make the second transmission channels 500 in each LED driving device jointly transmit the second display signal.

In the 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 second transmission channel 500 in each LED driving device transmits the direction of the second display signal The directions are both the second transport direction y. In the following, the working process of the multi-level LED driving system provided by the embodiment of the present application will be described in detail by taking the judgment branch 110 of all LED driving devices in the multi-level LED driving system adopting the first judgment mode as an example.

For this kind of transmission scenario, if the LED driver i is used as the current LED driver, then when the power line and/or ground wire of the LED driver i-1 is open, and/or the interior of the LED driver i-1 is damaged, and other When the power line and the ground wire of the LED driving device are not open, and the interior of other LED driving devices is not damaged, it is assumed that the first output terminal 430 of the LED driving device i-1 outputs a wrong first display signal to the LED driving device i The first input terminal 410 of the LED driving device i-1, 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, which means that the LED The first transmission channels 400 of all LED driving devices between driving device i and LED driving device n transmit wrong first display signals, and the first transmission channels 400 of all LED driving devices between LED driving device 1 and LED driving device i-2 One transmission channel 400 transmits the correct first display signal, and the second transmission channels 500 of all LED drive devices between LED drive device i and LED drive device n transmit the correct second display signal. The second transmission channels 500 of all LED driving devices between the driving devices i-2 also transmit correct second display signals. At this time, for all LED driving devices between LED driving device i and LED driving device n, the judging branch 110 of each LED driving device will judge the first display signal received by its first input terminal 410 is wrong, and the judgment branch 110 of each LED driving device will judge whether the second display signal received by its second input terminal 510 is abnormal, and the obtained judgment result is obtained by its second input terminal 510 The received second display signal is normal (this shows that the second signal segment intercepted by its second interception branch 522 from the second display signal is normal), so that the control branch 120 of each LED driving device controls The selection circuit 200 selects the second signal segment intercepted by its second intercepting 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 target signal segment according to the normal target signal segment. Drive the LEDs. For all LED driving devices between LED driving device 1 and LED driving device i-2, the judging branch 110 of each LED driving device will judge that the first display signal received by its first input terminal 410 is correct (This shows that the first signal segment intercepted by its first intercepting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select its first The first signal segment intercepted by the intercepting branch 422 is used 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. Therefore, except that the LED driving device i-1 is in an abnormal state, the rest of the LED driving devices are in a normal state.

Assume again that the first output terminal 430 of the LED driving device i-1 outputs the correct first display The display signal is sent 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 a wrong second display signal to the second input terminal 510 of the LED driving device i-2. It means that the first transmission channel 400 of all LED driving devices between LED driving device i and LED driving device n transmits the correct first display signal, and all LEDs between LED driving device 1 and LED driving device i-2 The first transmission channel 400 of the driving device also transmits the correct first display signal, and the second transmission channel 500 of all LED driving devices between the LED driving device i and the LED driving device n transmits the correct second display signal, and the LED The second transmission channels 500 of all LED driving devices between the driving device 1 and the LED driving device i-2 transmit wrong second display signals. At this time, for all LED driving devices between LED driving device 1 and LED driving device i-2, the judging branch 110 of each LED driving device will judge the first input received by its first input terminal 410 The display signal is correct (this means that the first signal segment intercepted by the first interception branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select The first signal segment intercepted by the first intercepting branch 422 is used 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 between LED driving device i and LED driving device n, the judging branch 110 of each LED driving device will judge that the first display signal received by its first input terminal 410 is correct (this It means that the first signal segment intercepted by the first intercepting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select its first intercepting branch The first signal segment intercepted by the circuit 422 is used 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. Therefore, except that the LED driving device i-1 is in an abnormal state, the rest of the LED driving devices are in a normal state.

Assume again that the first output terminal 430 of the LED driving device i-1 outputs a wrong first display The display signal is sent 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 also outputs a wrong 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 LED driving device i and LED driving device n transmit wrong first display signals, and all LED driving devices between LED driving device 1 and LED driving device i-2 The first transmission channel 400 of the LED driving device transmits the correct first display signal, and the second transmission channel 500 of all LED driving devices between the LED driving device i and the LED driving device n transmits the correct second display signal. The second transmission channels 500 of all LED driving devices between the driving device 1 and the LED driving device i-2 transmit wrong second display signals. At this time, for all LED driving devices between LED driving device i and LED driving device n, the judging branch 110 of each LED driving device will judge the first display signal received by its first input terminal 410 is wrong, and the judgment branch 110 of each LED driving device will judge whether the second display signal received by its second input terminal 510 is abnormal, and the obtained judgment result is obtained by its second input terminal 510 The received second display signal is normal (this shows that the second signal segment intercepted by its second interception branch 522 from the second display signal is normal), so that the control branch 120 of each LED driving device controls The selection circuit 200 selects the second signal segment intercepted by its second intercepting 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 target signal segment according to the normal target signal segment. Drive the LEDs. For all LED driving devices between LED driving device 1 and LED driving device i-2, the judging branch 110 of each LED driving device will judge that the first display signal received by its first input terminal 410 is correct (This shows that the first signal segment intercepted by its first intercepting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select its first The first signal segment intercepted by the intercepting branch 422 is used 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. Therefore, in addition to the LED driver i-1 Except in the abnormal state, the rest of the LED driving devices are in the normal state.

Of course, it is not limited thereto. Please refer to FIG. 9, which is a second block diagram of the multi-level LED driving system provided by the embodiment of the present application; in other embodiments, the first transmission in each LED driving device The channel 400 transmits the first display signal in the first transmission direction x, and the second transmission channel 500 in each LED driving device transmits the second display signal in the first transmission direction x. In the following, still taking the judgment branch 110 of all LED driving devices in the multi-level LED driving system adopting the first judgment mode as an example, the working process of the multi-level LED driving system provided by the embodiment of the present application will be described in detail.

For this kind of transmission scenario, if the LED driver i is used as the current LED driver, then when the power line and/or ground wire of the LED driver i-1 is open, and/or the interior of the LED driver i-1 is damaged, and other When the power line and the ground wire of the LED driving device are not open, and the interior of other LED driving devices is not damaged, it is assumed that the first output terminal 430 of the LED driving device i-1 outputs a wrong first display signal to the LED driving device i The first input terminal 410 of the LED driving device i-1, 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, which means that the LED driving device i to the LED The first transmission channels 400 of all LED driving devices between driving devices n transmit wrong first display signals, and the first transmission channels 400 of all LED driving devices between LED driving device 1 and LED driving device i-2 transmit wrong first display signals. The correct first display signal is transmitted, and the second transmission channels 500 of all LED drive devices between LED drive device i to LED drive device n transmit correct second display signals, and LED drive device 1 to LED drive device i-2 The second transmission channels 500 of all the LED driving devices therebetween also transmit correct second display signals. At this time, for all LED driving devices between LED driving device i and LED driving device n, the judging branch 110 of each LED driving device will judge the first display signal received by its first input terminal 410 is wrong, and the judging branch 110 of each LED driving device will judge whether the second display signal received by its second input terminal 510 is abnormal, and the obtained The judgment result is that the second display signal received by the second input terminal 510 is normal (this shows that the second signal segment intercepted by the second interception branch 522 from the second display signal is normal), so that each The control branch 120 of the LED driving device all controls the selection circuit 200 to select the second signal segment intercepted by its second intercepting branch 522 as the target signal segment, thereby ensuring that the driving circuit 300 of each LED driving device can operate according to the normal The target signal segment outputs a driving signal to a corresponding LED to be driven. For all LED driving devices between LED driving device 1 and LED driving device i-2, the judging branch 110 of each LED driving device will judge that the first display signal received by its first input terminal 410 is correct (This shows that the first signal segment intercepted by its first intercepting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select its first The first signal segment intercepted by the intercepting branch 422 is used 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. Therefore, except that the LED driving device i-1 is in an abnormal state, the rest of the LED driving devices are in a normal state.

Suppose further that the first output terminal 430 of the LED driving device i-1 outputs a correct 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 an error The second display signal to the second input terminal 510 of LED driving device i, which means that the first transmission channel 400 of all LED driving devices between LED driving device i and LED driving device n transmits the correct first display signal, the first transmission channel 400 of all LED driving devices between LED driving device 1 and LED driving device i-2 also transmits the correct first display signal, and all LEDs between LED driving device i and LED driving device n The second transmission channels 500 of the driving devices all transmit wrong second display signals, and the second transmission channels 500 of all LED driving devices between LED driving device 1 and LED driving device i-2 transmit correct second display signals. At this time, for all LED driving devices between LED driving device i and LED driving device n, the judging branch 110 of each LED driving device will judge its The first display signal received by the first input terminal 410 is correct (this means that the first signal segment intercepted by the first intercepting branch 422 from the first display signal is normal), so that each LED driving device The control branch 120 controls the selection circuit 200 to select the first signal segment intercepted by the first intercepting branch 422 as the target signal segment, thereby ensuring that the driving circuit 300 of each LED driving device can output the signal according to the normal target signal segment. Drive signals to the corresponding LEDs to be driven. For all LED driving devices between LED driving device 1 and LED driving device i-2, the judging branch 110 of each LED driving device will judge that the first display signal received by its first input terminal 410 is correct (This shows that the first signal segment intercepted by its first intercepting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select its first The first signal segment intercepted by the intercepting branch 422 is used 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. Therefore, except that the LED driving device i-1 is in an abnormal state, the rest of the LED driving devices are in a normal state.

Suppose further that the first output terminal 430 of the LED driving device i-1 outputs a 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 also outputs The wrong second display signal is sent to the second input terminal 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 and the LED driving device n transmit the wrong first display signal. For display signals, the first transmission channel 400 of all LED driving devices between LED driving device 1 and LED driving device i-2 transmits the correct first display signal, and all LEDs between LED driving device i and LED driving device n The second transmission channels 500 of the driving devices all transmit wrong second display signals, and the second transmission channels 500 of all LED driving devices between LED driving device 1 and LED driving device i-2 transmit correct second display signals. At this time, for all LED driving devices between LED driving device i and LED driving device n, the judging branch 110 of each LED driving device will judge its The first display signal received by the first input terminal 410 is wrong, and the judgment branch 110 of each LED driving device will then judge whether the second display signal received by the second input terminal 510 is abnormal, and the The obtained judgment result is that the second display signal received by the second input terminal 510 is abnormal (this shows that the second signal segment intercepted by the second interception branch 522 from the second display signal is abnormal), thus causing The judging branch 110 of each LED driving device returns to judging whether the first display signal received by the first input terminal 410 is abnormal, and so on. For all LED driving devices between LED driving device 1 and LED driving device i-2, the judging branch 110 of each LED driving device will judge that the first display signal received by its first input terminal 410 is correct (This shows that the first signal segment intercepted by its first intercepting branch 422 from the first display signal is normal), so that the control branch 120 of each LED driving device controls the selection circuit 200 to select its first The first signal segment intercepted by the intercepting branch 422 is used 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. Therefore, all LED driving devices between LED driving device i-1 to LED driving device n are in abnormal state, and all LED driving devices between LED driving device 1 to LED driving device i-2 are in normal state. However, not all the LED driving devices between the LED driving device i-1 to the LED driving device n are always in an abnormal state, for all the LED driving devices between the LED driving device i-1 to the LED driving device n, when The judging branch 110 of each LED driving device judges that the first display signal received by its first input terminal 410 is correct (this shows that the first signal intercepted by its first intercepting branch 422 from the first display signal segment is normal), or both judge that the second display signal received by its second input terminal 510 is correct (this shows that the second signal segment intercepted by its second interception branch 522 from the second display signal is normal ), all the LED driving devices between the LED driving device i-1 to the LED driving device n will change from the abnormal state to the normal state.

Or, please refer to Fig. 10, Fig. 10 is a block diagram of the third module of the multi-level LED driving system provided by the embodiment of the present application; in other embodiments, each LED driving device The direction in which the first transmission channel 400 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 also the second transmission direction y. For this kind of transmission scenario, the working process of the multi-level LED driving system provided by the embodiment of the present application is analogous to the transmission scenario as "the direction of the first display signal transmitted by the first transmission channel 400 in each LED driving device is the first The transmission direction x and the direction in which the second transmission channel 500 in each LED driving device transmits the second display signal are also the first transmission direction x", and the embodiment of the present application will not repeat them here.

In some embodiments, please refer to FIG. 11 . FIG. 11 is a block diagram of a fourth module of a multi-level LED driving system provided by an embodiment of the present application. As shown in Figure 11, the multi-level LED driving system provided by the embodiment of the present application may also include a first controller 600 and a second controller 700; wherein, the first controller 600 is set at the head end of the multi-level LED driving system, The second controller 700 is arranged at the tail end opposite to the head end of the multi-level LED driving system, and is located at the first transmission channel 400 and the second transmission channel 500 of the LED driving device at the head end (that is, the LED driving device 1 in FIG. 11 ). Both are connected to the first controller 600 , and the first transmission channel 400 and the second transmission channel 500 of the LED driving device at the rear end (ie LED driving device n in FIG. 11 ) are both connected to the second controller 700 .

Specifically, both the first controller 600 and the second controller 700 are used to control n LED driving devices in the multi-level LED driving system. Taking the first controller 600 as an example, its function may include but not limited to transmit the first display signal to the second controller 700 through the first transmission channel 400 of n LED driving devices in the multi-level LED driving system, or receive the first display signal. Second, the first display signal transmitted by the controller 700 through the first transmission channel 400 of the n LED driving devices in the multi-level LED driving system; and the second transmission channel of the n LED driving devices in the multi-level LED driving system 500 transmits the second display signal to the second controller 700, or receives the second display signal transmitted by the second controller 700 through the second transmission channel 500 of n LED driving devices in the multi-level LED driving system. Correspondingly, the same is true for the second controller 700 .

Please refer to Figure 12, Figure 12 is the flow of the LED driving method provided by the embodiment of the present application program schematic diagram. As shown in FIG. 12 , the embodiment of the present application also 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, obtains the first signal segment from the first display signal, and transmits the first display signal to the subsequent-stage LED driving device.

In the embodiment of the present application, when using the LED driving device provided in the embodiment of the present application to drive the corresponding LED to be driven, it is necessary to first receive the first display signal sent by the preceding LED driving device through the first transmission channel 400, and receive the first display signal from the received The first signal segment is obtained from the first display signal, and then the first display signal is transmitted to the subsequent LED driving device.

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

In the embodiment of the present application, while the first transmission channel 400 is performing related work, it also needs to receive the second display signal sent by the front-end LED driving device through the second transmission channel 500, and obtain the second display signal from the received second display signal. The second signal segment, and then the second display signal is transmitted to the subsequent LED driving device.

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

In the embodiment of the present application, after the first transmission channel 400 and the second transmission channel 500 perform related work, it is also necessary to judge the first display signal transmitted by the first transmission channel 400 and/or the second transmission channel 500 through the judgment circuit 100 Whether the transmitted second display signal is abnormal, and output a selection signal to the selection circuit 200 according to the judgment 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.

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 the embodiment of the present application, after receiving the selection signal output by the judgment circuit 100 according to the judgment result, the selection circuit 200 also needs to select the first signal segment or the second signal segment as the target signal segment according to the received selection signal, and set The selected target signal segment is transmitted to the driving circuit 300; wherein, the target signal segment is used to provide a reference for the driving circuit 300 to output a driving signal for driving the LED to be driven.

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

In the 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 also needs to output 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 when the driving circuits 300 of all LED driving devices in the multi-level LED driving system output corresponding driving signals according to the target signal segment received by themselves, the driving circuits 300 of all LED driving devices in the multi-level LED driving system All connected LEDs to be driven will emit light, thereby realizing the screen display function of the LED display device.

The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the present application will be generated in whole or in part. A computer can be a general purpose computer, special purpose computer, computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, computer instructions may be A server or data center transmits to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server, a data center, etc. integrated with one or more available media. Usable media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk), among others.

It should be noted that each embodiment in the content of this application is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same or similar parts between each embodiment are mutually Just see it. As for method embodiments, since they are based on the same inventive concept as product embodiments, the description is relatively simple, and for relevant information, please refer to the descriptions of corresponding parts of product embodiments.

It should also be noted that in the content of this application, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the contents of the application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in the content of the application can be used in other embodiments without departing from the spirit or scope of the content of the application. accomplish. Therefore, this application The content will not be limited to these embodiments shown in the content of the application, but will conform to the broadest scope consistent with the principles and novel features disclosed in the content of the application.

Claims

An LED driving device, characterized in that it includes a judging circuit, a selection circuit, a driving circuit, a first transmission channel, and a second transmission channel; wherein, the judging circuit and the selection circuit are respectively connected to the first transmission channel , the judgment circuit and the selection circuit are respectively connected to the second transmission channel, the judgment circuit is connected to the selection circuit, the selection circuit is connected to the drive circuit, and the drive circuit is used to connect LED to be driven;

The first transmission channel is used to receive the first display signal sent by the front-stage LED driving device, obtain a first signal segment from the first display signal, and transmit the first display signal to the rear-stage LED driver device;

The second transmission channel is used 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 Post-stage LED drive device;

The judgment circuit is used to judge whether the first display signal and/or the second display signal are abnormal, and output a selection signal to the selection circuit according to the judgment result;

The selection circuit is used 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;

The driving circuit is used for outputting a driving signal to the LED to be driven according to the target signal segment.
The LED driving device according to claim 1, wherein the judgment circuit comprises a judgment branch and a control branch;

The judging branch is used 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 judging whether the first display signal is abnormal;

The control branch is used to output a selection signal for selecting the first signal segment as the target signal segment to the selection circuit when the first display signal is normal, or in the When the second display signal is normal, outputting a selection signal for selecting the second signal segment as the target signal segment to the selection circuit.
The LED driving device according to claim 2, wherein the judging branch is specifically used for judging whether the level state of the first display signal changes within a preset time length and the level of the first display signal Whether the characteristic index is the same as the preset display signal, and the level state of the first display signal has not changed within the preset time period, and/or the characteristic index of the first display signal is the same as the preset When the display signals are different, it is judged 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 the preset display signal, and in the 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 the preset display signal, return to judge the first display signal Whether the level state changes within the preset time length and whether the characteristic index of the first display signal is the same as the preset display signal;

Wherein, if the level state of the first display signal changes within the preset time length, and the characteristic index of the first display signal is the same as that of the preset display signal, then 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 the preset display signal, Then the second display signal is normal; otherwise, the second display signal is abnormal.
The LED driving device according to claim 1, wherein the first transmission channel comprises a first input terminal, a first output terminal and a first processing circuit; wherein the first input terminal passes through the first a processing circuit connected to the first output terminal;

The first input terminal is used to receive the first display signal sent by the preceding LED driving device;

The first processing circuit is configured to obtain the first signal segment from the first display signal;

The first output terminal is used to transmit the first display signal to the subsequent LED drive unit.
The LED driving device according to claim 4, wherein the first processing circuit comprises a first shaping branch, a first clipping branch and a first regeneration branch;

The first shaping branch is used to shape the first display signal;

The first intercepting branch is used to intercept the shaped first display signal to obtain the first signal segment and the first remaining signal segment;

The first regeneration branch is used to regenerate the first residual signal segment to obtain the first display signal.
The LED driving device according to claim 1, wherein the second transmission channel comprises a second input terminal, a second output terminal and a second processing circuit; wherein the second input terminal passes through the second a processing circuit connected to the second output terminal;

The second input terminal is used to receive the second display signal sent by the preceding LED driving device;

The second processing circuit is configured to obtain the second signal segment from the second display signal;

The second output terminal is used to transmit the second display signal to the subsequent LED driving device.
The LED driving device according to claim 6, wherein the second processing circuit comprises a second shaping branch, a second clipping branch and a second regeneration branch;

The second shaping branch is used to shape the second display signal;

The second interception branch is used to intercept the shaped second display signal to obtain the second signal segment and the second remaining signal segment;

The second regeneration branch is used to regenerate the second remaining signal segment to obtain the second display signal.
A multi-level LED driving system, characterized in that it includes a plurality of LED driving devices cascaded in front and back according to any one of claims 1-7; wherein, the first transmission in each of the LED driving devices channels are interconnected, each of the LED drivers in the The second transmission channels are connected to each other.
The multi-level LED driving system according to claim 8, further comprising a first controller and a second controller; wherein the first controller is arranged at the head end of the multi-level LED driving system, The second controller is arranged at the tail end of the multi-stage LED drive system opposite to the head end, and is located at the first transmission channel and the second transmission channel of the LED drive device at the head end Both are 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.
An LED driving method applied to an LED driving device, characterized in that the LED driving device includes a judging circuit, a selection circuit, a driving circuit, a first transmission channel, and a second transmission channel; wherein, the judging circuit and the The selection circuits are respectively connected to the first transmission channel, the judgment circuit and the selection circuit are respectively connected to the second transmission channel, the judgment circuit is connected to the selection circuit, and the selection circuit is connected to the selection circuit. Described driving circuit, described driving circuit is used for connecting LED to be driven;

The LED driving method includes:

The first transmission channel receives the first display signal sent by the preceding LED driving device, obtains a first signal segment from the first display signal, and transmits the first display signal to the subsequent LED driving device;

The second transmission channel receives the second display signal sent by the front-stage LED driving device, obtains a second signal segment from the second display signal, and transmits the second display signal to the subsequent stage LED driver;

The judgment circuit judges whether the first display signal and/or the second display signal are abnormal, and outputs a selection signal to the selection circuit according to the judgment 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 drive circuit; the drive circuit selects the target signal segment according to the The target signal segment outputs a driving signal to the LED to be driven.