Display control circuit, LED display module, LED display device and display control method

Abstract

The invention provides a display control circuit, an LED display module, an LED display device and a display control method. The display control circuit comprises an input connector; a plurality of driving IC groups, wherein each driving IC group comprises a plurality of driving ICs which are arranged in a cascading manner; the first output circuit is in signal connection with the driving IC at the rearmost end in the plurality of driving IC groups; the second output circuit is in signal connection with the input plug connector; the selection circuit is in signal connection with the driving IC at the rearmost end in the plurality of driving IC groups and is used for judging whether the driving IC at the rearmost end in the plurality of driving IC groups outputs a control signal or not so as to control the first output circuit to work and the second output circuit to be switched off or control the second output circuit to work and the first output circuit to be switched off; and the output plug connector is in signal connection with the first output circuit and the second output circuit. According to the technical scheme, the problem that a large-area black screen appears in the LED display box body when the driving IC of the LED display module fails in the prior art can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of LED display technology, and in particular to a display control circuit, an LED display module, an LED display device and a display control method. Background Art

[0002] In the related art, when an LED display device fails to display an image, it is generally because a receiving card of the LED display box or a driver IC on the LED display module fails.

[0003] In order to ensure that the LED display device can display normally in the event of a failure, the existing solution generally adopts a signal dual backup solution. Specifically, two receiving cards are installed in the LED display box to form a signal channel. The interwoven communication loop ensures that the signal is not lost, ensuring that the video source can be safely transmitted to the LED display module to complete the normal display of the picture.

[0004] However, the above signal dual backup solution can only solve the problem of not being able to display normally when the receiving card fails, but cannot solve the problem of not being able to display normally when the driver IC of the LED display module fails. Since multiple LED display modules in the LED display box are generally cascaded, and multiple driver ICs on the LED display module are also cascaded, when a driver IC on a certain LED display module fails, the lamp beads controlled by the driver IC at the rear end of the failed driver IC will not be able to display, and the LED display module at the rear end will also not be able to display, resulting in a large area of ​​black screen on the entire LED display box. Summary of the invention

[0005] The main purpose of the present invention is to provide a display control circuit, an LED display module, an LED display device and a display control method to solve the problem of a large area of ​​black screen appearing in the LED display box when the driver IC of the LED display module fails in the related art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a display control circuit is provided, which is used to control the display of an LED display module, and the display control circuit includes: an input connector; a plurality of driver IC groups, each driver IC group is used to control a sub-pixel of a color, each driver IC group includes a plurality of driver ICs arranged in cascade, and the driver IC located at the front end is signal-connected to the input connector; a first output circuit is signal-connected to the driver IC at the rear end of the plurality of driver IC groups; a second output circuit is signal-connected to the input connector; a selection circuit is signal-connected to the driver IC at the rear end of the plurality of driver IC groups and is used to determine whether the rearmost driver IC in the plurality of driver IC groups has a control signal output, when the rearmost driver ICs in the plurality of driver IC groups all have a control signal output, the selection circuit controls the first output circuit to work and the second output circuit to shut down, and when the rearmost driver IC in at least one driver IC group does not have a control signal output, the selection circuit controls the second output circuit to work and the first output circuit to shut down; an output connector is signal-connected to both the first output circuit and the second output circuit.

[0007] Furthermore, the selection circuit includes a judgment circuit and multiple trigger circuits, and the multiple trigger circuits are connected one-to-one with the end-most driver IC in the multiple driver IC groups. When the end-most driver IC in the driver IC group has a control signal output, the corresponding trigger circuit transmits a first signal to the judgment circuit. When the end-most driver IC in the driver IC group has no control signal output, the corresponding trigger circuit transmits a second signal to the judgment circuit.

[0008] Furthermore, the trigger circuit includes a trigger and a delay control circuit.

[0009] Furthermore, the judgment circuit includes a decoder and a first conversion circuit, multiple trigger circuits are connected to the decoder signal, the decoder has a first output terminal and multiple second output terminals, the first output terminal is connected to the first output circuit, and the first conversion circuit is connected between the multiple second output terminals and the second output circuit, wherein, when the rearmost driver ICs in the multiple driver IC groups all have control signal outputs, the first output terminal outputs a working signal, and the first conversion circuit outputs a disable signal; when the rearmost driver IC in at least one driver IC group has no control signal output, the first output terminal outputs a disable signal, and the first conversion circuit outputs a working signal.

[0010] Further, the working signal is a low-level signal, and the disabling signal is a high-level signal. The first conversion circuit includes a first transistor, the emitter and the base of the first transistor are both conductively connected to the first power supply, the collector of the first transistor is grounded, an emitter resistor is arranged between the emitter of the first transistor and the first power supply, a third output terminal is arranged between the emitter resistor and the emitter of the first transistor, a first base resistor is arranged between the base of the first transistor and the first power supply, a switching diode is arranged between the base of the first transistor and each second output terminal, the cathode of the switching diode is connected to the second output terminal, and the anode of the switching diode is connected to the base of the first transistor, wherein, when at least one second output terminal outputs a working signal, the corresponding switching diode is turned on, so that the first transistor is turned on, and the third output terminal outputs a working signal; when multiple second output terminals all output disabling signals, multiple switching diodes are all turned off, so that the first transistor is turned off, and the third output terminal outputs a disabling signal.

[0011] Furthermore, the judgment circuit includes an AND gate circuit and a second conversion circuit, multiple trigger circuits are connected to the AND gate circuit, the AND gate circuit has a fourth output terminal, the fourth output terminal is connected to the second output circuit, and the second conversion circuit is connected between the fourth output terminal and the first output circuit, wherein, when the rearmost driver ICs in the multiple driver IC groups all have control signal outputs, the fourth output terminal outputs a disable signal, and the second conversion circuit outputs a working signal; when the rearmost driver IC in at least one driver IC group has no control signal output, the fourth output terminal outputs a working signal, and the second conversion circuit outputs a disable signal.

[0012] Furthermore, the working signal is a low-level signal, the disabling signal is a high-level signal, the second conversion circuit includes a second triode, the collector and the base of the second triode are both conductively connected to the second power supply, the emitter of the second triode is grounded, a collector resistor is arranged between the collector of the second triode and the second power supply, a fifth output terminal is arranged between the collector resistor and the emitter of the second triode, a second base resistor is arranged between the base of the second triode and the second power supply, and the base of the second triode is connected to the fourth output terminal, wherein, when the fourth output terminal outputs the working signal, the second triode is cut off, and the fifth output terminal outputs the disabling signal; when the fourth output terminal outputs the disabling signal, the second triode is turned on, and the fifth output terminal outputs the working signal.

[0013] Further, a first amplifier is arranged between the input connector and the plurality of driver IC groups; and / or, the first output circuit is a second amplifier; and / or, the second output circuit is a third amplifier.

[0014] According to another aspect of the present invention, there is provided an LED display module, comprising a lamp board, lamp beads arranged on the front side of the lamp board, and a display control circuit arranged on the rear side of the lamp board, wherein the display control circuit is the above-mentioned display control circuit.

[0015] According to another aspect of the present invention, there is provided an LED display device, comprising an LED display module, wherein the LED display module is the above-mentioned LED display module.

[0016] According to another aspect of the present invention, a display control method of an LED display module is provided, wherein the display control method applies the above-mentioned display control circuit to control the display of the LED display module, and the display control method comprises:

[0017] Detect whether the rearmost driver IC in the plurality of driver IC groups has a control signal output;

[0018] When the rearmost driver ICs in the plurality of driver IC groups all have control signal outputs, acquiring and transmitting to the output connector the control signal output by the rearmost driver IC in the plurality of driver IC groups;

[0019] When the rearmost driver IC in at least one driver IC group has no control signal output, the control signal transmitted by the input connector to the frontmost driver IC in the plurality of driver IC groups is acquired and transmitted to the output connector.

[0020] By applying the technical solution of the present invention, the input connector is used to receive control signals and transmit the control signals to multiple driver IC groups, wherein the selection circuit is connected to the signal of the driver IC at the end of the multiple driver IC groups, and can determine whether the driver IC at the end of the multiple driver IC groups has a control signal output. When the driver IC at the end of the driver IC group has a control signal output, it means that all the driver ICs in the driver IC group can work normally and the signal can be transmitted smoothly; when the driver IC at the end of the driver IC group has no control signal output, it means that at least one driver IC in the driver IC group has a fault, so that the control signal cannot be transmitted smoothly. When it is determined that the rearmost driver IC in all driver IC groups has a control signal output, it means that all driver ICs in all driver IC groups can work normally. At this time, the control signal is transmitted to the output connector through the first output circuit connected to the rearmost driver IC signal in the driver IC group, so as to realize the normal transmission of the control signal of the LED display module; when it is determined that the rearmost driver IC in at least one driver IC group has no control signal output, it means that a driver IC fails, so that the signal transmission is interrupted. At this time, the control signal is transmitted to the output connector through the second output circuit connected to the input connector signal, so that the next LED display module in the cascade displays the picture of the current LED display module, so as to realize the smooth transmission of the control signal backward, and avoid the situation that a large area of ​​black screen appears on an LED display box due to the failure of the driver IC on a certain LED display module, which affects the display of the rear LED display module. Therefore, the technical solution of the present application can effectively solve the problem of a large area of ​​black screen on the LED display box when the driver IC of the LED display module fails in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A circuit diagram showing control signal transmission of a display control circuit according to the present invention;

[0023] Figure 2 A circuit diagram showing a trigger circuit of a display control circuit according to the present invention is shown;

[0024] Figure 3 A circuit diagram showing a first embodiment of a judgment circuit of a display control circuit according to the present invention;

[0025] Figure 4 Shows Figure 3 The truth table of the decoder in the judgment circuit;

[0026] Figure 5 A circuit diagram showing a second embodiment of a judgment circuit of a display control circuit according to the present invention;

[0027] Figure 6 A flow chart of a display control method according to the present invention is shown.

[0028] The above drawings include the following reference numerals:

[0029] 10. Input connector;

[0030] 20. Driver IC group; 21. Driver IC;

[0031] 30. A first output circuit;

[0032] 40. A second output circuit;

[0033] 50, selection circuit; 51, judgment circuit; 511, decoder; 512, first conversion circuit; 5121, first triode; 5122, emitter resistor; 5123, first base resistor; 5124, switch diode; 513, AND gate circuit; 514, second conversion circuit; 5141, second triode; 5142, collector resistor; 5143, second base resistor; 52, trigger circuit; 521, trigger; 522, delay control circuit;

[0034] 501, a first output terminal; 502, a second output terminal; 503, a third output terminal; 504, a fourth output terminal; 505, a fifth output terminal;

[0035] 60. Output connector;

[0036] 70. The first amplifier. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figures 1 to 5As shown, the present application provides a display control circuit. An embodiment of the display control circuit of the present application is used to control the display of an LED display module. The display control circuit includes: an input connector 10, multiple driver IC groups 20, a first output circuit 30, a second output circuit 40, a selection circuit 50 and an output connector 60. Among them, each driver IC group 20 is used to control a sub-pixel of one color, and each driver IC group 20 includes multiple driver ICs 21 arranged in cascade, and the driver IC 21 located at the front end is signal-connected to the input connector 10; the first output circuit 30 is signal-connected to the driver IC 21 at the rear end of the multiple driver IC groups 20; the second output circuit 40 is signal-connected to the input connector 10; the selection circuit 50 is signal-connected to the driver IC 21 at the rear end of the multiple driver IC groups 20 and is used to determine whether the driver IC 21 at the rear end of the multiple driver IC groups 20 has a control signal output. When the driver ICs 21 at the rear end of the multiple driver IC groups 20 all have control signal outputs, the selection circuit 50 controls the first output circuit 30 to work and the second output circuit 40 to shut down. When at least one of the driver ICs 21 at the rear end of the driver IC groups 20 has no control signal output, the selection circuit 50 controls the second output circuit 40 to work and the first output circuit 30 to shut down; the output connector 60 is signal-connected to both the first output circuit 30 and the second output circuit 40.

[0039] By applying the technical solution of this embodiment, the input connector 10 is used to receive control signals and transmit the control signals to multiple driver IC groups 20, wherein the selection circuit 50 is signal-connected to the rearmost driver IC 21 in the multiple driver IC groups 20, and can determine whether the rearmost driver IC 21 in the multiple driver IC groups 20 has a control signal output. When the rearmost driver IC 21 in the driver IC group 20 has a control signal output, it means that all driver ICs 21 in the driver IC group 20 can work normally and the signal can be transmitted smoothly; when the rearmost driver IC 21 in the driver IC group 20 has no control signal output, it means that at least one driver IC 21 in the driver IC group 20 has a fault, so that the control signal cannot be transmitted smoothly. When it is determined that the rearmost driver IC21 in all driver IC groups 20 has a control signal output, it means that all driver ICs 21 in all driver IC groups 20 can work normally. At this time, the control signal is transmitted to the output connector 60 through the first output circuit 30 connected to the signal of the rearmost driver IC21 in the driver IC group 20, so as to realize the normal transmission of the control signal of the LED display module; when it is determined that at least one rearmost driver IC21 in the driver IC group 20 has no control signal output, it means that a driver IC21 fails, so that the signal transmission is interrupted. At this time, the control signal is transmitted to the output connector 60 through the second output circuit 40 connected to the signal of the input connector 10, so that the next LED display module in the cascade displays the picture of the current LED display module, so as to realize the smooth transmission of the control signal backward, and avoid the situation where a large area of ​​black screen appears on the LED display box due to the failure of the driver IC21 on a certain LED display module affecting the display of the rear LED display module. Therefore, the technical solution of this embodiment can effectively solve the problem of a large area of ​​black screen appearing in the LED display box when the driver IC of the LED display module fails in the related art.

[0040] It should be noted that when the second output circuit 40 is used to transmit a control signal to the output connector 60, the next LED display module in the cascade will display the image of the current LED display module, and the images displayed by the subsequent LED display modules will be misaligned one by one, which will affect the display effect to a certain extent, but avoid the occurrence of a large area of ​​black screen on the LED display box. For scenes that only display vector graphics or simple lines, there is basically no impact on the display effect.

[0041] Specifically, in this embodiment, the display control circuit includes three driver IC groups 20, and the three driver IC groups 20 control the display of sub-pixels of three colors: red, green, and blue, respectively.

[0042] like Figures 2 to 5As shown, the selection circuit 50 includes a judgment circuit 51 and a plurality of trigger circuits 52. The plurality of trigger circuits 52 are connected one by one with the rearmost driving IC 21 in the plurality of driving IC groups 20. When the rearmost driving IC 21 in the driving IC group 20 outputs a control signal, the corresponding trigger circuit 52 transmits a first signal to the judgment circuit 51. When the rearmost driving IC 21 in the driving IC group 20 does not output a control signal, the corresponding trigger circuit 52 transmits a second signal to the judgment circuit 51. The waveform of the control signal for controlling the display of sub-pixels of different colors is constantly changing. By setting the trigger circuit 52, the steady-state first signal and the second signal can be output to the judgment circuit 51 according to whether there is a control signal, so as to judge whether there is a driver IC 21 failure and select to continue to transmit the control signal downward through the first output circuit 30 or the second output circuit 40.

[0043] Specifically, in this embodiment, the first signal is a high level signal, and the second signal is a low level signal. Of course, the specific types of the first signal and the second signal can be selected according to the judgment circuit, for example, the first signal is a low level signal and the second signal is a high level signal.

[0044] like Figure 2 As shown, the trigger circuit 52 includes a trigger 521 and a delay control circuit 522. The delay control circuit 522 is provided with a delay capacitor and a delay resistor. By reasonably setting the parameters of the delay capacitor and the delay resistor, the required delay time is obtained, so that as long as there is a control signal input, the trigger 521 can stably output a high-level signal.

[0045] Specifically, in this embodiment, there are three driver IC groups 20 and three trigger circuits 52 .

[0046] Figure 3 A circuit diagram of a first embodiment of a judgment circuit 51 according to the present application is shown. In this embodiment, a decoder 511 is used as a circuit body.

[0047] Specifically, Figure 3As shown, the judgment circuit 51 includes a decoder 511 and a first conversion circuit 512, multiple trigger circuits 52 are signal-connected to the decoder 511, the decoder 511 has a first output terminal 501 and multiple second output terminals 502, the first output terminal 501 is connected to the first output circuit 30, and the first conversion circuit 512 is connected between the multiple second output terminals 502 and the second output circuit 40, wherein, when the rearmost driver IC 21 in the multiple driver IC groups 20 all have control signal outputs, the first output terminal 501 outputs a working signal, and the first conversion circuit 512 outputs a disable signal; when the rearmost driver IC 21 in at least one driver IC group 20 has no control signal output, the first output terminal 501 outputs a disable signal, and the first conversion circuit 512 outputs a working signal.

[0048] In this embodiment, there are three driver IC groups 20, and three trigger circuits 52 respectively input three state signals to the decoder 511. According to the combination of the three state signals, there are eight output results. When the driver IC 21 at the end of the plurality of driver IC groups 20 all outputs a control signal, the first output terminal 501 (specifically Figure 3 The Y7 terminal in the figure) outputs the working signal, and the plurality of second output terminals 502 (specifically Figure 3 When the rearmost driver IC 21 in at least one driver IC group 20 does not output a control signal, the first output terminal 501 outputs a disable signal, and some of the plurality of second output terminals 502 output disable signals and some output working signals. By setting the first conversion circuit 512, the output signals of the plurality of second output terminals 502 can be processed, so that when the plurality of second output terminals 502 output disable signals, the first conversion circuit 512 outputs a disable signal and the second output circuit 40 does not work, and when at least one second output terminal 502 outputs a working signal, the first conversion circuit 512 outputs a working signal and the second output circuit 40 works.

[0049] like Figure 3As shown, the working signal is a low-level signal, and the disable signal is a high-level signal. The first conversion circuit 512 includes a first triode 5121, the emitter and the base of the first triode 5121 are both conductively connected to the first power supply, the collector of the first triode 5121 is grounded, an emitter resistor 5122 is provided between the emitter of the first triode 5121 and the first power supply, a third output terminal 503 is provided between the emitter resistor 5122 and the emitter of the first triode 5121, a first base resistor 5123 is provided between the base of the first triode 5121 and the first power supply, and the base of the first triode 5121 and each second output terminal 503 are provided between the emitter resistor 5122 and the emitter of the first triode 5121. A switching diode 5124 is arranged between the output terminals 502, the cathode of the switching diode 5124 is connected to the second output terminal 502, and the anode of the switching diode 5124 is connected to the base of the first transistor 5121, wherein when at least one second output terminal 502 outputs a working signal, the corresponding switching diode 5124 is turned on, so that the first transistor 5121 is turned on, and the third output terminal 503 outputs a working signal; when multiple second output terminals 502 all output a disable signal, the multiple switching diodes 5124 are all turned off, so that the first transistor 5121 is turned off, and the third output terminal 503 outputs a disable signal.

[0050] The first output circuit 30 and the second output circuit 40 work when receiving a low-level signal, and do not work when receiving a high-level signal.

[0051] Specifically, the 73HC138 decoder is used in this embodiment, and its truth table is as follows: Figure 4 When the rearmost driving IC 21 in the plurality of driving IC groups 20 all outputs a control signal, the first output terminal 501 outputs a low level, and the plurality of second output terminals 502 output a high level; when the rearmost driving IC 21 in at least one driving IC group 20 does not output a control signal, the first output terminal 501 outputs a high level, one of the plurality of second output terminals 502 outputs a low level, and the rest output a high level. The first transistor 5121 is a PNP transistor.

[0052] When the rearmost driving IC 21 in the plurality of driving IC groups 20 all outputs a control signal, the first output terminal 501 outputs a low level to make the first output circuit 30 work; the plurality of second output terminals 502 all output a high level to make all the switch diodes 5124 cut off, thereby making the base of the first triode 5121 at a high level, the first triode 5121 cut off, and the third output terminal 503 (specifically Figure 3 The YY0 terminal in the LED display module outputs a high level to make the second output circuit 40 not work. Thus, when all the driver ICs work normally, the control signal is transmitted to the next LED display module through the first output circuit 30.

[0053] When the rearmost driver IC 21 in at least one driver IC group 20 has no control signal output, the first output terminal 501 outputs a high level so that the first output circuit 30 does not work; one of the plurality of second output terminals 502 outputs a low level, thereby turning on the corresponding switch diode 5124, the base of the first triode 5121 is at a low level, the first triode 5121 is turned on, and the third output terminal 503 outputs a low level so that the second output circuit 40 works. In this way, when there is a driver IC 21 failure, the control signal is transmitted to the next LED display module through the second output circuit 40.

[0054] Figure 5 1 shows a circuit diagram of a second embodiment of a judgment circuit 51 according to the present application. In this embodiment, an AND gate circuit 513 is used as a circuit body.

[0055] like Figure 5 As shown, the judgment circuit 51 includes an AND gate circuit 513 and a second conversion circuit 514, a plurality of trigger circuits 52 are connected to the AND gate circuit 513, the AND gate circuit 513 has a fourth output terminal 504, the fourth output terminal 504 is connected to the second output circuit 40, and the second conversion circuit 514 is connected between the fourth output terminal 504 and the first output circuit 30, wherein, when the rearmost driving IC 21 in the plurality of driving IC groups 20 all have control signal outputs, the fourth output terminal 504 outputs a disable signal, and the second conversion circuit 514 outputs a working signal; when the rearmost driving IC 21 in at least one driving IC group 20 has no control signal output, the fourth output terminal 504 outputs a working signal, and the second conversion circuit 514 outputs a disable signal. The second conversion circuit 514 can control the fourth output terminal 504 (specifically Figure 5 The signal output by the YY0 terminal in the first output circuit 30 is inverted, thereby controlling one of the first output circuit 30 and the second output circuit 40 to work and the other not to work.

[0056] like Figure 5As shown, the working signal is a low-level signal, and the disabling signal is a high-level signal. The second conversion circuit 514 includes a second triode 5141, the collector and the base of the second triode 5141 are both conductively connected to the second power supply, the emitter of the second triode 5141 is grounded, a collector resistor 5142 is provided between the collector of the second triode 5141 and the second power supply, a fifth output terminal 505 is provided between the collector resistor 5142 and the emitter of the second triode 5141, a second base resistor 5143 is provided between the base of the second triode 5141 and the second power supply, and the base of the second triode 5141 is connected to the fourth output terminal 504, wherein, when the fourth output terminal 504 outputs the working signal, the second triode 5141 is turned off, and the fifth output terminal 505 outputs the disabling signal; when the fourth output terminal 504 outputs the disabling signal, the second triode 5141 is turned on, and the fifth output terminal 505 outputs the working signal.

[0057] The first output circuit 30 and the second output circuit 40 work when receiving a low level signal, and do not work when receiving a high level signal. The second transistor 5141 is an NPN transistor.

[0058] When the rearmost driving IC 21 in the plurality of driving IC groups 20 all outputs a control signal, the fourth output terminal 504 outputs a high level so that the second output circuit 40 does not work; the base of the second triode 5141 is at a high level so that the second triode 5141 is turned on, and the fifth output terminal 505 (i.e. Figure 5 The Y7 terminal in the first output circuit 30 outputs a low level to make the first output circuit 30 work. Thus, when all the driving ICs work normally, the control signal is transmitted to the next LED display module through the first output circuit 30.

[0059] When the rearmost driver IC 21 in at least one driver IC group 20 has no control signal output, the fourth output terminal 504 inputs a low level to make the second output circuit 40 work; the base of the second triode 5141 is at a low level, so that the second triode 5141 is turned off, and the fifth output terminal 505 outputs a high level to make the first output circuit 30 not work. In this way, when there is a driver IC 21 failure, the control signal is transmitted to the next LED display module through the second output circuit 40.

[0060] In this embodiment, if Figure 1 As shown, a first amplifier 70 is provided between the input connector 10 and the plurality of driver IC groups 20; the first output circuit 30 is a second amplifier; and the second output circuit 40 is a third amplifier. Since the control signals between adjacent LED display modules are generally transmitted through cables, signal attenuation occurs during the transmission process. By providing amplifiers at the signal input position and signal output position of the LED display module, the signal quality can be improved.

[0061] The present application also provides an LED display module, including a lamp board, lamp beads arranged on the front side of the lamp board, and a display control circuit arranged on the rear side of the lamp board, wherein the display control circuit is the above-mentioned display control circuit. The above-mentioned display control circuit can effectively solve the problem of a large area of ​​black screen appearing in the LED display box when the driver IC of the LED display module in the related art fails, and the LED display module with the above-mentioned display control circuit also has the above-mentioned advantages.

[0062] The present application also provides an LED display device, comprising an LED display module, wherein the LED display module is the above-mentioned LED display module.

[0063] like Figure 6 As shown, the present application also provides a display control method of an LED display module, wherein the display control method applies the above-mentioned display control circuit to control the display of the LED display module, and the display control method includes:

[0064] Step S10: Detect whether the rearmost driver IC 21 in the plurality of driver IC groups 20 outputs a control signal;

[0065] Step S20: when the rearmost driver IC 21 in the plurality of driver IC groups 20 all outputs a control signal, obtaining and transmitting the control signal output by the rearmost driver IC 21 in the plurality of driver IC groups 20 to the output connector 60;

[0066] Step S30 : when the rearmost driver IC 21 in at least one driver IC group 20 has no control signal output, obtain and transmit to the output connector 60 the control signal transmitted by the input connector 10 to the frontmost driver IC 21 in the plurality of driver IC groups 20 .

[0067] By applying the technical solution of this embodiment, in step S10, it is detected whether the control signal output of the rearmost driver IC21 in the multiple driver IC groups 20 is detected to determine whether there is a driver IC21 failure in the display control circuit of the LED display module; when it is determined that all the driver ICs21 in all the driver IC groups 20 can work normally, the control signal output by the rearmost driver IC21 in the multiple driver IC groups 20 is obtained and transmitted to the output connector 60, thereby realizing the normal transmission of the control signal of the LED display module; when it is determined that a driver IC21 fails, the control signal transmitted by the input connector 10 to the frontmost driver IC21 in the multiple driver IC groups 20 is obtained and transmitted to the output connector 60, so that the next LED display module in the cascade displays the picture of the current LED display module, thereby realizing the smooth backward transmission of the control signal, and avoiding the situation where a large area of ​​black screen appears on an LED display box due to the failure of the driver IC21 on a certain LED display module affecting the display of the rear LED display module. Therefore, the technical solution of this embodiment can effectively solve the problem of a large area of ​​black screen appearing in the LED display box when the driver IC of the LED display module fails in the related art.

[0068] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0069] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A display control circuit, characterized in that: The display control circuit is used to control the display of the LED display module, and the display control circuit includes: Input connector (10); A plurality of driver IC groups (20), each of the driver IC groups (20) being used to control a sub-pixel of a certain color, each of the driver IC groups (20) comprising a plurality of driver ICs (21) arranged in cascade connection, the driver IC (21) located at the front end being signal-connected to the input connector (10); A first output circuit (30) is signal-connected to the last driver IC (21) in the plurality of driver IC groups (20); A second output circuit (40) is signal-connected to the input connector (10); A selection circuit (50) is connected to the signal of the driver IC (21) at the rear end of the plurality of driver IC groups (20) and is used to determine whether the driver IC (21) at the rear end of the plurality of driver IC groups (20) has a control signal output; when the driver IC (21) at the rear end of the plurality of driver IC groups (20) has a control signal output, the selection circuit (50) controls the first output circuit (30) to operate and the second output circuit (40) to shut down; when at least one of the driver ICs (21) at the rear end of the plurality of driver IC groups (20) has no control signal output, the selection circuit (50) controls the second output circuit (40) to operate and the first output circuit (30) to shut down; An output connector (60) is signal-connected to both the first output circuit (30) and the second output circuit (40).

2. The display control circuit according to claim 1, characterized in that: The selection circuit (50) comprises a judgment circuit (51) and a plurality of trigger circuits (52). The plurality of trigger circuits (52) are connected to the rearmost driver IC (21) in the plurality of driver IC groups (20) in a one-to-one correspondence. When the rearmost driver IC (21) in the driver IC group (20) outputs a control signal, the corresponding trigger circuit (52) transmits a first signal to the judgment circuit (51). When the rearmost driver IC (21) in the driver IC group (20) does not output a control signal, the corresponding trigger circuit (52) transmits a second signal to the judgment circuit (51).

3. The display control circuit according to claim 2, characterized in that: The trigger circuit (52) comprises a trigger (521) and a delay control circuit (522).

4. The display control circuit according to claim 2 or 3, characterized in that: The judgment circuit (51) comprises a decoder (511) and a first conversion circuit (512); a plurality of trigger circuits (52) are signal-connected to the decoder (511); the decoder (511) has a first output terminal (501) and a plurality of second output terminals (502); the first output terminal (501) is connected to the first output circuit (30); the first conversion circuit (512) is connected between the plurality of second output terminals (502) and the second output circuit (40); When the rearmost driving IC (21) in the plurality of driving IC groups (20) all outputs a control signal, the first output terminal (501) outputs a working signal, and the first conversion circuit (512) outputs a disable signal; When the rearmost driving IC (21) in at least one driving IC group (20) has no control signal output, the first output terminal (501) outputs a disable signal, and the first conversion circuit (512) outputs a working signal.

5. The display control circuit according to claim 4, characterized in that: The working signal is a low-level signal, the disabling signal is a high-level signal, the first conversion circuit (512) comprises a first triode (5121), the emitter and the base of the first triode (5121) are both conductively connected to a first power supply, the collector of the first triode (5121) is grounded, an emitter resistor (5122) is provided between the emitter of the first triode (5121) and the first power supply, and a resistor between the emitter resistor (5122) and the emitter of the first triode (5121) is connected to the first power supply. A third output terminal (503) is arranged between the first transistor (5121), a first base resistor (5123) is arranged between the base of the first transistor (5121) and the first power supply, a switching diode (5124) is arranged between the base of the first transistor (5121) and each of the second output terminals (502), the cathode of the switching diode (5124) is connected to the second output terminal (502), and the anode of the switching diode (5124) is connected to the base of the first transistor (5121), wherein: When at least one of the second output terminals (502) outputs a working signal, the corresponding switch diode (5124) is turned on, so that the first transistor (5121) is turned on, and the third output terminal (503) outputs a working signal; When the plurality of second output terminals (502) all output a disable signal, the plurality of switch diodes (5124) are all turned off, so that the first transistor (5121) is turned off, and the third output terminal (503) outputs a disable signal.

6. The display control circuit according to claim 2 or 3, characterized in that: The judgment circuit (51) comprises an AND gate circuit (513) and a second conversion circuit (514); a plurality of trigger circuits (52) are connected to the AND gate circuit (513); the AND gate circuit (513) has a fourth output terminal (504); the fourth output terminal (504) is connected to the second output circuit (40); the second conversion circuit (514) is connected between the fourth output terminal (504) and the first output circuit (30); wherein: When the rearmost driver IC (21) in the plurality of driver IC groups (20) outputs a control signal, the fourth output terminal (504) outputs a disable signal, and the second conversion circuit (514) outputs a working signal; When the rearmost driver IC (21) in at least one of the driver IC groups (20) has no control signal output, the fourth output terminal (504) outputs a working signal and the second conversion circuit (514) outputs a disable signal.

7. The display control circuit according to claim 6, characterized in that: The working signal is a low-level signal, the disabling signal is a high-level signal, the second conversion circuit (514) comprises a second triode (5141), the collector and the base of the second triode (5141) are both conductively connected to the second power supply, the emitter of the second triode (5141) is grounded, a collector resistor (5142) is provided between the collector of the second triode (5141) and the second power supply, a fifth output terminal (505) is provided between the collector resistor (5142) and the emitter of the second triode (5141), a second base resistor (5143) is provided between the base of the second triode (5141) and the second power supply, and the base of the second triode (5141) is connected to the fourth output terminal (504), wherein: When the fourth output terminal (504) outputs a working signal, the second transistor (5141) is turned off, and the fifth output terminal (505) outputs a disable signal; When the fourth output terminal (504) outputs a disable signal, the second transistor (5141) is turned on, and the fifth output terminal (505) outputs a working signal.

8. The display control circuit according to any one of claims 1 to 3, characterized in that: A first amplifier (70) is provided between the input connector (10) and the plurality of driver IC groups (20); and / or, The first output circuit (30) is a second amplifier; and / or, The second output circuit (40) is a third amplifier.

9. An LED display module, comprising a lamp board, lamp beads arranged on the front side of the lamp board, and a display control circuit arranged on the rear side of the lamp board, characterized in that: The display control circuit is the display control circuit according to any one of claims 1 to 8.

10. An LED display device, comprising an LED display module, characterized in that: The LED display module is the LED display module according to claim 9.

11. A display control method for an LED display module, characterized in that: The display control method uses the display control circuit described in any one of claims 1 to 8 to control the display of the LED display module, and the display control method includes: Detecting whether a rearmost driver IC (21) in a plurality of driver IC groups (20) has a control signal output; When the rearmost driver IC (21) in the plurality of driver IC groups (20) all outputs a control signal, acquiring and transmitting to the output connector (60) the control signal output by the rearmost driver IC (21) in the plurality of driver IC groups (20); When the rearmost driver IC (21) in at least one of the driver IC groups (20) has no control signal output, a control signal transmitted by the input connector (10) to the frontmost driver IC (21) in the plurality of driver IC groups (20) is acquired and transmitted to the output connector (60).

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