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

Abstract

The present invention provides a display control circuit, an LED display module, an LED display device and a display control method. The display control circuit includes: an input connector; a plurality of driver IC groups, each driver IC group including a plurality of driver ICs arranged in cascade; a first output circuit, signal-connected to the last driver IC in the plurality of driver IC groups; a second output circuit, signal-connected to the input connector; a selection circuit, signal-connected to the last driver IC in the plurality of driver IC groups and used to determine whether the last driver IC in the plurality of driver IC groups outputs a control signal, so as to control the first output circuit to work and the second output circuit to be turned off, or control the second output circuit to work and the first output circuit to be turned off; an output connector, signal-connected to both the first output circuit and the second output circuit. The technical solution of this application can effectively solve the problem that a large area of the LED display box goes black when the driver IC of the LED display module in the related art fails.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display, 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, generally, a receiving card in the LED display cabinet or a driving IC on the LED display module fails.

[0003] To ensure that the LED display device can display normally when a failure occurs, the existing solution generally adopts a signal dual-backup scheme. Specifically, two receiving cards are installed in the LED display cabinet to form a signal channel, and 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 scheme can only solve the problem of abnormal display when the receiving card fails, and cannot solve the problem of abnormal display when the driving IC of the LED display module fails. Since multiple LED display modules in the LED display cabinet are generally cascaded, and multiple driving ICs on the LED display module are also cascaded, when a certain driving IC on a certain LED display module fails, the lamp beads controlled by the driving IC at the back end of the failed driving IC cannot be displayed, and the LED display module at the back end cannot be displayed either. As a result, a large area of black screen will appear on the entire LED display cabinet. Summary of the Invention

[0005] The main object 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 on the LED display cabinet when the driving IC of the LED display module fails in the related art.

[0006] To achieve the above object, according to one aspect of the present invention, a display control circuit is provided. The display control circuit is used to control the display of an LED display module. The display control circuit includes: an input plug-in connector; a plurality of driving IC groups, each driving IC group is used to control sub-pixels of one color, each driving IC group includes a plurality of cascaded driving ICs, and the driving IC located at the forefront is signal-connected to the input plug-in connector; a first output circuit, signal-connected to the driving IC at the last end of the plurality of driving IC groups; a second output circuit, signal-connected to the input plug-in connector; a selection circuit, signal-connected to the driving IC at the last end of the plurality of driving IC groups and used to judge whether the driving IC at the last end of the plurality of driving IC groups has a control signal output. When the driving IC at the last end of the plurality of driving IC groups all have control signal outputs, the selection circuit controls the first output circuit to work and the second output circuit to be turned off. When at least one driving IC at the last end of the driving IC groups does not have a control signal output, the selection circuit controls the second output circuit to work and the first output circuit to be turned off; an output plug-in connector, signal-connected to both the first output circuit and the second output circuit.

[0007] Further, the selection circuit includes a judgment circuit and a plurality of trigger circuits. The plurality of trigger circuits are connected to the driving ICs at the last end of the plurality of driving IC groups in one-to-one correspondence. When the driving IC at the last end of the driving IC group has a control signal output, the corresponding trigger circuit transmits a first signal to the judgment circuit. When the driving IC at the last end of the driving IC group does not have a control signal output, the corresponding trigger circuit transmits a second signal to the judgment circuit.

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

[0009] Further, the judgment circuit includes a decoder and a first conversion circuit. The plurality of trigger circuits are signal-connected to the decoder. The decoder has a first output terminal and a plurality of second output terminals. The first output terminal is connected to the first output circuit, and the first conversion circuit is connected between the plurality of second output terminals and the second output circuit. Among them, when the driving ICs at the last end of the plurality of driving IC groups all have control signal outputs, the first output terminal outputs a working signal, and the first conversion circuit outputs a disabling signal; when at least one driving IC at the last end of the driving IC groups does not have a control signal output, the first output terminal outputs a disabling 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 triode. The emitter and base of the first triode are both conductively connected to a first power supply. The collector of the first triode is grounded. An emitter resistor is provided between the emitter of the first triode and the first power supply. A third output terminal is provided between the emitter resistor and the emitter of the first triode. A first base resistor is provided between the base of the first triode and the first power supply. A switching diode is provided between the base of the first triode 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 triode. Wherein, when at least one second output terminal outputs a working signal, the corresponding switching diode conducts, so that the first triode conducts, and the third output terminal outputs a working signal; when multiple second output terminals all output disabling signals, multiple switching diodes are all cut off, so that the first triode is cut off, and the third output terminal outputs a disabling signal.

[0011] Further, 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. The second conversion circuit is connected between the fourth output terminal and the first output circuit. Wherein, when the last driving ICs in multiple driving IC groups all output control signals, the fourth output terminal outputs a disabling signal, and the second conversion circuit outputs a working signal; when at least one of the last driving ICs in the driving IC groups does not output a control signal, the fourth output terminal outputs a working signal, and the second conversion circuit outputs a disabling signal.

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

[0013] Further, a first amplifier is provided between the input plug-in and multiple driving 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, including a lamp board, lamp beads disposed on the front side of the lamp board, and a display control circuit disposed 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, including 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, there is provided a display control method for an LED display module, wherein the display control method uses the above-mentioned display control circuit to control the display of the LED display module, and the display control method includes:

[0017] Detecting whether the last driving IC in multiple groups of driving ICs outputs a control signal;

[0018] When the last driving IC in multiple groups of driving ICs all outputs a control signal, acquiring and transmitting the control signal output by the last driving IC in multiple groups of driving ICs to the output plug-in;

[0019] When at least one of the last driving ICs in multiple groups of driving ICs does not output a control signal, acquiring and transmitting the control signal transmitted by the input plug-in to the first driving IC in multiple groups of driving ICs to the output plug-in.

[0020] Applying the technical solution of the present invention, the input plug-in is used to receive a control signal and transmit the control signal to multiple driver IC groups. Among them, the selection circuit is signal-connected to the last driver IC in the multiple driver IC groups and can determine whether the last driver IC in the multiple driver IC groups outputs a control signal. When the last driver IC in the driver IC group outputs a control signal, it indicates that all the driver ICs in the driver IC group can work normally and the signal can be transmitted smoothly; when the last driver IC in the driver IC group does not output a control signal, it indicates that at least one driver IC in the driver IC group has a fault, resulting in the control signal not being transmitted smoothly. When it is determined that the last driver ICs in all the driver IC groups output control signals, it indicates that all the driver ICs in all the driver IC groups can work normally. At this time, the control signal is transmitted to the output plug-in through the first output circuit signal-connected to the last driver IC in the driver IC group, realizing the normal transmission of the control signal of the LED display module; when it is determined that the last driver ICs in at least one driver IC group do not output control signals, it indicates that a driver IC has a fault, resulting in the interruption of signal transmission. At this time, the control signal is transmitted to the output plug-in through the second output circuit signal-connected to the input plug-in, so that the next cascaded LED display module displays the picture of the current LED display module, realizing the smooth backward transmission of the control signal and avoiding the situation of a large-area black screen on an LED display cabinet due to the failure of the driver IC on a certain LED display module affecting the display of the subsequent LED display modules. Therefore, the technical solution of this application can effectively solve the problem of a large-area black screen on the LED display cabinet when the driver IC of the LED display module in the related technology fails. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0023] Figure 2 shows the circuit diagram of the trigger circuit of the display control circuit according to the present invention;

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

[0025] Figure 4 shows Figure 3 the truth table of the decoder in the judgment circuit of

[0026] Figure 5 The circuit diagram of the second embodiment of the judgment circuit of the display control circuit according to the present invention is shown;

[0027] Figure 6 The flowchart of the display control method according to the present invention is shown.

[0028] Among them, the above-mentioned drawings include the following reference numerals:

[0029] 10. Input connector;

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

[0031] 30. First output circuit;

[0032] 40. 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. Flip-flop; 522. Delay control circuit;

[0034] 501. First output terminal; 502. Second output terminal; 503. Third output terminal; 504. Fourth output terminal; 505. Fifth output terminal;

[0035] 60. Output connector;

[0036] 70. First amplifier. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] As Figures 1 to 5As shown in the figure, 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, a plurality of driving 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 driving IC group 20 is used to control sub-pixels of one color. Each driving IC group 20 includes a plurality of cascaded driving ICs 21. The driving IC 21 at the forefront is signal-connected to the input connector 10; the first output circuit 30 is signal-connected to the driving IC 21 at the last stage of the plurality of driving 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 driving IC 21 at the last stage of the plurality of driving IC groups 20 and is used to judge whether the driving IC 21 at the last stage of the plurality of driving IC groups 20 has a control signal output. When the driving IC 21 at the last stage of the plurality of driving 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 be turned off. When at least one of the driving ICs 21 at the last stage of the plurality of driving IC groups 20 does not have a control signal output, the selection circuit 50 controls the second output circuit 40 to work and the first output circuit 30 to be turned off; the output connector 60 is signal-connected to both the first output circuit 30 and the second output circuit 40.

[0039] Applying the technical solution of this embodiment, the input plug-in 10 is used to receive a control signal and transmit the control signal to multiple driver IC groups 20. Among them, the selection circuit 50 is signal-connected to the last driver IC 21 in the multiple driver IC groups 20, and can determine whether the last driver IC 21 in the multiple driver IC groups 20 outputs a control signal. When the last driver IC 21 in the driver IC group 20 outputs a control signal, it indicates that all the driver ICs 21 in this driver IC group 20 can work normally and the signal can be transmitted smoothly; when the last driver IC 21 in the driver IC group 20 does not output a control signal, it indicates that at least one driver IC 21 in this driver IC group 20 has a fault, resulting in the control signal not being transmitted smoothly. When it is determined that the last driver IC 21 in all the driver IC groups 20 outputs a control signal, it indicates that all the driver ICs 21 in all the driver IC groups 20 can work normally. At this time, the control signal is transmitted to the output plug-in 60 through the first output circuit 30 that is signal-connected to the last driver IC 21 in the driver IC group 20, realizing the normal transmission of the control signal of the LED display module; when it is determined that the last driver IC 21 in at least one driver IC group 20 does not output a control signal, it indicates that a driver IC 21 has a fault, resulting in the interruption of signal transmission. At this time, the control signal is transmitted to the output plug-in 60 through the second output circuit 40 that is signal-connected to the input plug-in 10, so that the next cascaded LED display module displays the picture of the current LED display module, realizing the smooth backward transmission of the control signal, and avoiding the situation of a large-area black screen on an LED display box due to the fault of the driver IC 21 on a certain LED display module affecting the display of the subsequent LED display modules. Therefore, the technical solution of this embodiment can effectively solve the problem of a large-area black screen on the LED display box when the driver IC of the LED display module in the related technology fails.

[0040] It should be noted that when using the second output circuit 40 to transmit the control signal to the output plug-in 60, the next cascaded LED display module will display the picture of the current LED display module, and the pictures displayed by the subsequent LED display modules will also be misaligned one by one, which will affect the display effect to a certain extent, but it avoids the occurrence of a large-area black screen on the LED display box. For scenarios 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 3 driver IC groups 20, and the 3 driver IC groups 20 respectively control the display of sub-pixels of three colors: red, green, and blue.

[0042] Such as 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 to the last driving IC 21 in the plurality of driving IC groups 20 in a one-to-one correspondence. When the last 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 last 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. Among them, 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, it is possible to output a steady first signal and a second signal to the judgment circuit 51 according to whether there is a control signal, so as to judge whether there is a failure in the driving IC 21 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 set as a low-level signal and the second signal is set as a high-level signal.

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

[0045] Specifically, in this embodiment, there are 3 driving IC groups 20, and there are also 3 trigger circuits 52.

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

[0047] Specifically, as Figure 3As shown, the judgment circuit 51 includes 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. Among them, when the last 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 disabling signal; when at least one of the last driving IC 21 in the plurality of driving IC groups 20 does not output a control signal, the first output terminal 501 outputs a disabling signal, and the first conversion circuit 512 outputs a working signal.

[0048] In this embodiment, there are 3 driving IC groups 20. The three trigger circuits 52 respectively input 3 status signals to the decoder 511. According to the combination of the 3 status signals, there are 8 output results. When the last driving IC 21 in the plurality of driving IC groups 20 all outputs a control signal, the first output terminal 501 (specifically the Figure 3 Y7 terminal in it) outputs a working signal, and the plurality of second output terminals 502 (specifically the Figure 3 Y0 - Y6 terminals in it) output disabling signals; when at least one of the last driving IC 21 in the plurality of driving IC groups 20 does not output a control signal, the first output terminal 501 outputs a disabling signal, and some of the plurality of second output terminals 502 output disabling 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 disabling signals, the first conversion circuit 512 outputs a disabling signal to make the second output circuit 40 not work, and when at least one of the second output terminals 502 outputs a working signal, the first conversion circuit 512 outputs a working signal to make the second output circuit 40 work.

[0049] Such as Figure 3As shown, the working signal is a low-level signal and the disabling signal is a high-level signal. The first conversion circuit 512 includes a first triode 5121. The emitter and 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. A switching diode 5124 is provided between the base of the first triode 5121 and each second output terminal 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 triode 5121. Wherein, when at least one second output terminal 502 outputs a working signal, the corresponding switching diode 5124 conducts, so that the first triode 5121 conducts, and the third output terminal 503 outputs a working signal; when multiple second output terminals 502 all output disabling signals, multiple switching diodes 5124 all cut off, so that the first triode 5121 cuts off, and the third output terminal 503 outputs a disabling signal.

[0050] Wherein, 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, in this embodiment, a 73HC138 decoder is used, and its truth table is as Figure 4 shown. When the last driving IC 21 in multiple driving IC groups 20 all outputs a control signal, the first output terminal 501 outputs a low level, and multiple second output terminals 502 output a high level; when at least one of the last driving IC 21 in the driving IC groups 20 does not output a control signal, the first output terminal 501 outputs a high level, and one of the multiple second output terminals 502 outputs a low level and the rest output a high level. The first triode 5121 is a PNP triode.

[0052] When the last driving IC 21 in multiple 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; multiple second output terminals 502 all output a high level, making all switching diodes 5124 cut off, and further making the base of the first triode 5121 at a high level, and the first triode 5121 cuts off. The third output terminal 503 (specifically Figure 3 the YY0 terminal in) outputs a high level to make the second output circuit 40 not work. Thus, it is realized that when all driving ICs work normally, the control signal is transmitted to the next LED display module through the first output circuit 30.

[0053] When the last driving IC 21 in at least one driving IC group 20 has no control signal output, the first output terminal 501 outputs a high level, causing the first output circuit 30 not to work; one of the multiple second output terminals 502 outputs a low level, thereby causing the corresponding switching diode 5124 to conduct, the base of the first triode 5121 to be at a low level, the first triode 5121 to conduct, and the third output terminal 503 to output a low level, causing the second output circuit 40 to work. Thus, when there is a fault in the driving IC 21, the control signal is transmitted to the next LED display module through the second output circuit 40.

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

[0055] As Figure 5 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. The second conversion circuit 514 is connected between the fourth output terminal 504 and the first output circuit 30. Among them, when the last driving IC 21 in the plurality of driving IC groups 20 all have control signal outputs, the fourth output terminal 504 outputs a disabling signal, and the second conversion circuit 514 outputs a working signal; when at least one of the last driving IC 21 in the plurality of driving 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 disabling signal. Among them, the second conversion circuit 514 can reverse the signal output by the fourth output terminal 504 (specifically the YY0 terminal in Figure 5 ), thereby realizing the control that one of the first output circuit 30 and the second output circuit 40 works and the other does not work.

[0056] As 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 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. 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 triode 5141 is cut off, and the fifth output terminal 505 outputs a disabling signal; when the fourth output terminal 504 outputs a disabling signal, the second triode 5141 is turned on, and the fifth output terminal 505 outputs a working signal.

[0057] Among them, 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 triode 5141 is an NPN triode.

[0058] When the last driving IC 21 in each of the multiple driving IC groups 20 outputs a control signal, the fourth output terminal 504 outputs a high level, causing the second output circuit 40 not to work; the base of the second triode 5141 is at a high level, causing the second triode 5141 to be turned on, and the fifth output terminal 505 (that is, Figure 5 the Y7 terminal in) outputs a low level, causing the first output circuit 30 to work. Thus, when all the driving ICs work properly, the control signal is transmitted to the next LED display module through the first output circuit 30.

[0059] When at least one of the last driving ICs 21 in the driving IC groups 20 does not output a control signal, the fourth output terminal 504 outputs a low level, causing the second output circuit 40 to work; the base of the second triode 5141 is at a low level, causing the second triode 5141 to be cut off, and the fifth output terminal 505 outputs a high level, causing the first output circuit 30 not to work. Thus, when there is a failure of the driving IC 21, the control signal is transmitted to the next LED display module through the second output circuit 40.

[0060] In this embodiment, as Figure 1 shown, a first amplifier 70 is provided between the input connector 10 and the multiple driving IC groups 20; the first output circuit 30 is a second amplifier; the second output circuit 40 is a third amplifier. Since the control signals between adjacent LED display modules are generally transmitted through a flexible cable, signal attenuation will occur during the signal transmission process. By providing amplifiers at the signal input position and the 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. Among them, the display control circuit is the above-mentioned display control circuit. The above-mentioned display control circuit can effectively solve the problem that a large area of the LED display box goes black when the driving IC of the LED display module in the related art fails. 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, including an LED display module. Among them, the LED display module is the above-mentioned LED display module.

[0063] As Figure 6 shown, the present application also provides a display control method for an LED display module. Among them, the display control method uses the above-mentioned display control circuit to control the display of the LED display module. The display control method includes:

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

[0065] Step S20: When the last driving IC 21 in the plurality of driving IC groups 20 all outputs a control signal, obtain and transmit the control signal output by the last driving IC 21 in the plurality of driving IC groups 20 to the output plug-in 60;

[0066] Step S30: When at least one of the last driving ICs 21 in the plurality of driving IC groups 20 does not output a control signal, obtain and transmit the control signal transmitted by the input plug-in 10 to the frontmost driving IC 21 in the plurality of driving IC groups 20 to the output plug-in 60.

[0067] Applying the technical solution of this embodiment, in step S10, it is detected whether the last driving IC 21 in the multiple driving IC groups 20 outputs a control signal, so as to determine whether a driving IC 21 in the display control circuit of the LED display module fails; when it is determined that all the driving ICs 21 in all the driving IC groups 20 can work normally, the control signal output by the last driving IC 21 in the multiple driving IC groups 20 is obtained and transmitted to the output connector 60, realizing the normal transmission of the control signal of the LED display module; when it is determined that a driving IC 21 fails, the control signal transmitted by the input connector 10 to the frontmost driving IC 21 in the multiple driving IC groups 20 is obtained and transmitted to the output connector 60, so that the next cascaded LED display module displays the picture of the current LED display module, realizing the smooth backward transmission of the control signal and avoiding the situation of a large-area black screen on an LED display box due to the failure of the driving IC 21 on a certain LED display module, which affects the display of the subsequent LED display modules. Therefore, the technical solution of this embodiment can effectively solve the problem of a large-area black screen on the LED display box when the driving IC of the LED display module in the related technology fails.

[0068] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0069] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, these words have no special meaning. Therefore, it should not be understood as a limitation on the protection scope of the present invention.

[0070] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. 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) signal-connected to both the first output circuit (30) and the second output circuit (40); 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).

2. The display control circuit according to claim 1, characterized in that: The trigger circuit (52) comprises a trigger (521) and a delay control circuit (522).

3. The display control circuit according to claim 1 or 2, 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.

4. The display control circuit according to claim 3, 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.

5. The display control circuit according to claim 1 or 2, 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.

6. The display control circuit according to claim 5, 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.

7. The display control circuit according to any one of claims 1 to 2, 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.

8. 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 7.

9. An LED display device, comprising an LED display module, characterized in that: The LED display module is the LED display module according to claim 8.

10. 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 7 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).

Images