CN110085163B - LED display cascade control circuit and LED display screen - Google Patents
LED display cascade control circuit and LED display screen Download PDFInfo
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- CN110085163B CN110085163B CN201910336958.0A CN201910336958A CN110085163B CN 110085163 B CN110085163 B CN 110085163B CN 201910336958 A CN201910336958 A CN 201910336958A CN 110085163 B CN110085163 B CN 110085163B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention relates to an LED display cascade control circuit and an LED display screen, wherein the LED display cascade control circuit obtains a light-emitting signal from an upper cascade circuit by a first signal selection module and a second signal selection module according to a first control signal and a second control signal sent by the control module, the light-emitting signal is sent to the second signal selection module by an LED driving module and sent to a lower cascade circuit by the second signal selection module, or the light-emitting signal is obtained from the upper cascade circuit by the second signal selection module and sent to the first signal selection module by the LED driving module and sent to the lower cascade circuit by the first signal selection module, so that the first signal selection module and the second signal selection module can both receive the light-emitting signal and send the light-emitting signal, and the input direction and the output direction are not required to be selected during installation, the expansion cascade is more convenient, the compatibility among products is increased, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to an LED display cascade control circuit and an LED display screen.
Background
As a novel display technology, an LED (Light Emitting Diode) display screen is gradually accepted by the market due to its advantages of energy saving, environmental protection, high brightness, and the like, and thus is widely applied to the fields of urban media, urban traffic, and the like. Along with the development of electronic technology, the LED display screen with a wider screen is more and more favored by users. In order to increase the screen width of the display screen, the box modules of the LED display screen are usually cascaded, the module signal input interface and the module signal output interface are defined differently, so that the module distinguishes left and right fixed signal input/output, that is, the left fixed interface is required to be an input end or an output end and the right fixed interface is required to be an input end or an output end, data split cannot be performed, the cable of the signal cascade is too long, and the production cost is increased.
Disclosure of Invention
Therefore, it is necessary to provide a cascade control circuit for LED display and an LED display screen to solve the problem that the conventional module needs to fix the input/output terminals.
An LED display cascade control circuit comprising: the LED driving circuit comprises a first signal selection module, a second signal selection module, a control module and an LED driving module; the first signal selection module is provided with a first connecting end, a first signal output end and a first signal input end, the second signal selection module is provided with a second connecting end, a second signal output end and a second signal input end, the first signal output end and the second signal output end are respectively connected with the input end of the LED driving module, the first signal input end and the second signal input end are respectively connected with the output end of the LED driving module, and the control module is respectively connected with the first signal selection module and the second signal selection module.
The control module is used for sending a second control signal to the second signal selection module when sending a first control signal to the first signal selection module, and the control module is also used for sending a first control signal to the second signal selection module when sending a second control signal to the first signal selection module.
The first signal selection module is used for receiving a first light-emitting signal through the first connection end when receiving the first control signal, and sending the first light-emitting signal to the input end of the LED driving module through the first signal output end; the second signal selection module is configured to receive the first light-emitting signal from the output end of the LED driving module through the second signal input end and send the first light-emitting signal through the second connection end when receiving the second control signal.
The second signal selection module is further configured to receive a second light emitting signal through the second connection end when receiving the first control signal, and send the second light emitting signal to the input end of the LED driving module through the second signal output end; the first signal selection module is further configured to receive the second light-emitting signal from the output end of the LED driving module through the first signal input end and send the second light-emitting signal through the first connection end when receiving the second control signal.
The LED driving module is used for receiving the first light-emitting signal, driving an LED according to the first light-emitting signal, receiving the second light-emitting signal and driving the LED according to the second light-emitting signal.
In one embodiment, the control module is configured to send the first control signal to the first signal selection module and send the second control signal to the second signal selection module by receiving a first adjustment signal, and the control module is further configured to receive a second adjustment signal, send the second control signal to the first signal selection module, and send the first control signal to the second signal selection module.
In one embodiment, the LED display cascade control circuit further includes a signal adapter card, the signal adapter card is connected to the control module, the control module is configured to receive an adjustment signal of the signal adapter card, and the control module is configured to generate the first control signal and the second control signal by receiving the adjustment signal.
In one embodiment, the control module is an inverter, a first input end of the inverter is connected to the signal adapter card, a first output end of the inverter is connected to a second input end of the inverter, the first output end of the inverter is further connected to the first signal selection module, and the second output end of the inverter is connected to the second signal selection module.
In one embodiment, the LED display cascade control circuit further includes a first interface module and a second interface module, the control module is connected to the first interface module and the second interface module respectively, and the first interface module and the second interface module are connected to the signal adapter card respectively.
In one embodiment, the LED display cascade control circuit further includes a first decoding module and a second decoding module, the first decoding module is connected to the second decoding module, the control module is respectively connected to the first decoding module and the second decoding module, and the control module is configured to send the first control signal or the second control signal to the first decoding module and the second decoding module.
The first decoding module is used for receiving a light-emitting control signal and sending the light-emitting control signal to the second decoding module when receiving the first control signal; the second decoding module is used for receiving the light-emitting control signal from the first decoding module and sending the light-emitting control signal when receiving the first control signal.
The second decoding module is further configured to receive the light emission control signal and send the light emission control signal to the first decoding module when receiving the second control signal; the first decoding module is further configured to receive the light-emitting control signal from the second decoding module and send the light-emitting control signal when receiving the second control signal.
In one embodiment, the LED display cascade control circuit further includes a first interface module and a second interface module, the first interface module is connected to the first decoding module, and the second interface module is connected to the second decoding module.
In one embodiment, the first decoding module and the second decoding module are respectively connected with the LED driving module.
In one embodiment, the LED display cascade control circuit further includes a first interface module and a second interface module, the first interface module is connected to the first connection end, and the second interface module is connected to the second connection end.
An LED display screen comprises the LED display cascade control circuit in any one of the embodiments.
When the control module sends a first control signal to the first signal selection module and a second control signal to the second signal selection module, the first signal selection module acquires a luminous signal from the upper cascade circuit, sends the luminous signal to the second signal selection module and sends the luminous signal to the lower cascade circuit by the second signal selection module, and conversely, when the control module sends the first control signal to the second signal selection module and sends the second control signal to the first signal selection module, the second signal selection module acquires the luminous signal from the upper cascade circuit, sends the luminous signal to the first signal selection module and sends the luminous signal to the lower cascade circuit by the first signal selection module, so that the first signal selection module and the second signal selection module can receive the luminous signal and send the luminous signal, and the input direction and the output direction do not need to be selected during installation, the expansion cascade is more convenient, the compatibility among products is increased, the production cost is reduced, and the after-sale maintenance is facilitated.
Drawings
FIG. 1 is a block diagram of an LED display cascade control circuit according to an embodiment;
FIG. 2a is a schematic circuit diagram of a first signal selection block in one embodiment;
FIG. 2b is a schematic circuit diagram of a second signal selection block in one embodiment;
FIG. 3 is a schematic circuit diagram of an LED driver module in one embodiment;
FIG. 4 is a circuit schematic of a control module in one embodiment;
FIG. 5 is a circuit schematic of a first decoding block and a second decoding block in one embodiment;
FIG. 6 is a circuit schematic of a first interface module and a second interface module in one embodiment;
fig. 7 is a circuit schematic of a signal adapter card in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, an LED display cascade control circuit comprising: the LED driving circuit comprises a first signal selection module, a second signal selection module, a control module and an LED driving module; the first signal selection module is provided with a first connecting end, a first signal output end and a first signal input end, the second signal selection module is provided with a second connecting end, a second signal output end and a second signal input end, the first signal output end and the second signal output end are respectively connected with the input end of the LED driving module, the first signal input end and the second signal input end are respectively connected with the output end of the LED driving module, the control module is used for sending a second control signal to the second signal selection module when sending a first control signal to the first signal selection module, and the control module is also used for sending a first control signal to the second signal selection module when sending a second control signal to the first signal selection module.
The first signal selection module is used for receiving a first light-emitting signal through the first connection end when receiving the first control signal, and sending the first light-emitting signal to the input end of the LED driving module through the first signal output end; the second signal selection module is configured to receive the first light-emitting signal from the output end of the LED driving module through the second signal input end and send the first light-emitting signal through the second connection end when receiving the second control signal.
The second signal selection module is further configured to receive a second light emitting signal through the second connection end when receiving the first control signal, and send the second light emitting signal to the input end of the LED driving module through the second signal output end; the first signal selection module is further configured to receive the second light-emitting signal from the output end of the LED driving module through the first signal input end and send the second light-emitting signal through the first connection end when receiving the second control signal.
The LED driving module is used for receiving the first light-emitting signal, driving an LED according to the first light-emitting signal, receiving the second light-emitting signal and driving the LED according to the second light-emitting signal.
In the LED display cascade control circuit, when the control module sends a first control signal to the first signal selection module and sends a second control signal to the second signal selection module, the first signal selection module acquires a luminous signal from the upper cascade circuit, sends the luminous signal to the second signal selection module, and sends the luminous signal to the next cascade circuit by the second signal selection module, otherwise, when the control module sends the first control signal to the second signal selection module and sends the second control signal to the first signal selection module, the second signal selection module acquires the luminous signal from the upper cascade circuit, sends the luminous signal to the first signal selection module, and sends the luminous signal to the next cascade circuit by the first signal selection module, so that the first signal selection module and the second signal selection module can receive the luminous signal and send the luminous signal, and the input direction and the output direction are not required to be selected during installation, the expansion cascade is more convenient, the compatibility among products is increased, the production cost is reduced, and the after-sale maintenance is facilitated.
In one embodiment, referring to fig. 1, fig. 2a and fig. 2b, an LED display cascade control circuit 10 is provided, which includes: a first signal selection module 100, a second signal selection module 200, a control module 300 and an LED driving module 400; the first signal selection module 100 has a first connection end, a first signal output end and a first signal input end, the second signal selection module 200 has a second connection end, a second signal output end and a second signal input end, the first signal output end and the second signal output end are respectively connected with the input end of the LED driving module 300, the first signal input end and the second signal input end are respectively connected with the output end of the LED driving module 300, and the control module 300 is respectively connected with the first signal selection module 100 and the second signal selection module 200.
The control module is configured to send a second control signal to the second signal selection module when sending the first control signal to the first signal selection module, and the control module is further configured to send a first control signal to the second signal selection module when sending the second control signal to the first signal selection module, that is, the control module sends the first control signal and the second control signal to the first signal selection module and the second signal selection module, so that one of the first signal selection module and the second signal selection module receives the first control signal, and the other receives the second control signal.
The first signal selection module is used for receiving the first light-emitting signal through the first connection end when receiving the first control signal, and sending the first light-emitting signal to the input end of the LED driving module through the first signal output end; the second signal selection module is configured to receive the first light-emitting signal from the output end of the LED driving module through the second signal input end and send the first light-emitting signal through the second connection end when receiving the second control signal.
The second signal selection module is further configured to receive the second light-emitting signal through the second connection end and send the second light-emitting signal to the input end of the LED driving module through the second signal output end when receiving the first control signal; the first signal selection module is further configured to receive the second light-emitting signal from the output end of the LED driving module through the first signal input end and send the second light-emitting signal through the first connection end when receiving the second control signal.
It should be noted that the first signal selection module and the second signal selection module are multi-channel two-choice electronic switches, when the first signal selection module receives the first control signal, the first connection end is connected to the first signal output end, when the first signal selection module receives the second control signal, the first connection end is connected to the first signal input end, similarly, when the second signal selection module receives the first control signal, the second connection end is connected to the second signal output end, and when the second signal selection module receives the second control signal, the second connection end is connected to the second signal input end.
As can be understood, when the first signal selection module receives the first control signal, the first connection end and the first signal output end are connected, the first connection end receives the first light-emitting signal, and the first light-emitting signal is sent to the input end of the LED driving module through the first signal output end, and the LED driving module sends the first light-emitting signal to the second signal selection module through the output end; at this time, the second signal selection module receives the second control signal, the second signal input end is connected with the second connection end, the first light-emitting signal is received from the output end of the LED driving module through the second signal input end, and the first light-emitting signal is sent through the second connection end, so that the first light-emitting signal is sent to the second signal selection module from the first signal selection module.
Similarly, when the second signal selection module receives the first control signal, the second connection end and the second signal output end are connected, the second light-emitting signal is received through the second connection end, the second light-emitting signal is sent to the input end of the LED driving module through the second signal output end, the second light-emitting signal is sent to the first signal selection module through the output end of the LED driving module, at this time, the first signal selection module receives the second control signal, the first signal output end and the second connection end are connected, the second light-emitting signal is received from the output end of the LED driving module through the first signal input end, and the second light-emitting signal is sent to the first signal selection module through the first connection end, so that the second light-emitting signal is sent to the first signal selection module from the second signal selection module.
It should be mentioned that the first light emitting signal and the second light emitting signal may be the same light emitting signal or different light emitting signals, in this embodiment, the first light emitting signal and the second light emitting signal both belong to light emitting signals, and the difference between the first light emitting signal and the second light emitting signal is that the transmission directions of the first light emitting signal and the second light emitting signal are different, specifically, the light emitting signals include R, G, B three signals, namely, a red light signal, a green light signal, and a blue light signal.
The LED driving module is used for receiving a first light emitting signal, driving an LED according to the first light emitting signal, receiving a second light emitting signal and driving the LED according to the second light emitting signal. In one embodiment, the LED driving module is used to connect to an LED, and when the LED driving module receives a first light emitting signal, the LED driving module drives the LED according to the first light emitting signal, and when the LED driving module receives a second light emitting signal, the LED is driven according to the second light emitting signal.
In the LED display cascade control circuit, when the control module sends a first control signal to the first signal selection module and sends a second control signal to the second signal selection module, the first signal selection module acquires a luminous signal from the upper cascade circuit, sends the luminous signal to the second signal selection module, and sends the luminous signal to the next cascade circuit by the second signal selection module, otherwise, when the control module sends the first control signal to the second signal selection module and sends the second control signal to the first signal selection module, the second signal selection module acquires the luminous signal from the upper cascade circuit, sends the luminous signal to the first signal selection module, and sends the luminous signal to the next cascade circuit by the first signal selection module, so that the first signal selection module and the second signal selection module can receive the luminous signal and send the luminous signal, and the input direction and the output direction are not required to be selected during installation, the expansion cascade is more convenient, the compatibility among products is increased, the production cost is reduced, and the after-sale maintenance is facilitated.
In order to facilitate the control module to send corresponding control signals to the first signal selection module and the second signal selection module, in one embodiment, the control module is configured to send the first control signal to the first signal selection module and send the second control signal to the second signal selection module by receiving a first adjustment signal, and the control module is further configured to receive a second adjustment signal, send a second control signal to the first signal selection module, and send the first control signal to the second signal selection module. In one embodiment, the first adjustment signal is a low level signal and the second adjustment signal is a high level signal. Therefore, the control module can send corresponding control signals to the first signal selection module and the second signal selection module conveniently according to the received adjusting signals.
In order to realize that the control module receives an adjusting signal to generate a first control signal and a second control signal, in one embodiment, the control signal is used for receiving the first adjusting signal, generating the first control signal, and inverting the first control signal to generate the second control signal; the control signal is further configured to receive a second adjustment signal, generate the second control signal, and invert the second control signal to generate the first control signal. In this embodiment, the control module inverts the first adjustment signal to generate a first control signal, inverts the first control signal to generate a second control signal, inverts the second adjustment signal to generate a second control signal, and inverts the second control signal to generate the first control signal, so that the control module can generate the first control signal and the second control signal by receiving an adjustment signal.
In order to facilitate the control module to send corresponding control signals to the first signal selection module and the second signal selection module, in one embodiment, please refer to fig. 3 and 7, the LED display cascade control circuit further includes a signal adapter card 600, the signal adapter card 600 is connected to the control module 300, the control module is configured to receive an adjustment signal of the signal adapter card, generate the first control signal and the second control signal by receiving the adjustment signal, and send the first control signal and the second control signal to the first signal selection module and the second signal selection module, respectively.
In particular, the signal adapter card may also be referred to as a HUB card (multi-interface repeater) for forwarding a signal, in an embodiment, the signal adapter card has a plurality of interfaces, and a user may define a type of a signal of one interface so as to send an adjustment signal to the control module through the interface, in an embodiment, the type of the signal of the interface is a high level, in another embodiment, the type of the signal of the interface is a low level, in particular, the control module is configured to send a first control signal to the first signal selection module and a second control signal to the second signal selection module, or send the second control signal to the first signal selection module and the first control signal to the second signal selection module, in an embodiment, when the adjustment signal is a low level signal, the control module sends the first control signal to the first signal selection module, and sending the second control signal to the second signal selection module, and when the adjusting signal is a high-level signal, sending the second control signal to the first signal selection module and sending the first control signal to the second signal selection module by the control module. In this embodiment, the first control signal is a high-level signal, the second control signal is a low-level signal, and the signal adapter card is connected to the control module and sends the adjustment signal to the control module, so that the user defines the type of the adjustment signal in the signal adapter card according to the requirement, and the control module is convenient to send the corresponding control signal to the first signal selection module and the second signal selection module.
In order to facilitate the control module to generate the first control signal and the second control signal, in one embodiment, please refer to fig. 2a, fig. 2b, fig. 4 and fig. 6, the control module 300 is an inverter, a first input end of the inverter is connected to the signal adapter 600, a first output end of the inverter is connected to a second input end of the inverter, a first output end of the inverter is further connected to the first signal selection module 100, and a second output end of the inverter is connected to the second signal selection module 200.
It is to be understood that the inverter is a not gate controller, and the inverter is used for signal inversion, for example, the inverter may invert a high level signal into a low level signal and output the low level signal, or invert the low level signal into a high level signal and output the high level signal. Specifically, the first output end of the phase inverter is connected with the first signal selection module, namely, the first output end of the phase inverter is connected with the SO pin of the first signal selection module, the second output end of the phase inverter is connected with the second signal selection module, namely, the second output end of the phase inverter is connected with the SO pin of the second signal selector, and the first output end and the second input end of the phase inverter are in short circuit, SO that the adjusting signal is processed by the phase inverter and outputs a first control signal and a second control signal, and the control module can generate the first control signal and the second control signal conveniently.
Specifically, when a signal is received by a first input end of the inverter, the signal is directly output through a first output end, the signal output by the first output end is input to the inverter through a second input end, so that the signal is inverted, and the inverted signal is output through a second output end, so that the inverter can output two opposite signals through the first output end and the second output end and respectively send the signals to the first signal selection module and the second signal selection module.
In order to facilitate the control module to obtain the adjustment signal, in one embodiment, please refer to fig. 3, fig. 6 and fig. 7, the LED display cascade control circuit further includes a first interface module JP1 and a second interface module JP2, the control module 300 is connected to the first interface module JP1 and the second interface module JP2, respectively, and the first interface module JP1 and the second interface module JP2 are connected to the signal adapter card 400, respectively. By arranging the first interface module and the second interface module, the control module receives the adjusting signal of the signal transfer card through the first interface module or the second interface module, namely, a user only needs to butt the first interface module or the second interface module with the signal transfer card, so that the control module can conveniently acquire the adjusting signal.
In order to facilitate bidirectional transmission of the light emitting control signal, in one embodiment, please refer to fig. 3 and fig. 5, the LED display cascade control circuit further includes a first decoding module 510 and a second decoding module 520, the first decoding module 510 is connected to the second decoding module 520, the control module 300 is respectively connected to the first decoding module 510 and the second decoding module 520, and the control module 300 is configured to send the first control signal or the second control signal to the first decoding module 510 and the second decoding module 520.
The first decoding module is used for receiving a light-emitting control signal and sending the light-emitting control signal to the second decoding module when receiving the first control signal; the second decoding module is used for receiving the light-emitting control signal from the first decoding module and sending the light-emitting control signal when receiving the first control signal.
The second decoding module is further configured to receive the light emission control signal and send the light emission control signal to the first decoding module when receiving the second control signal; the first decoding module is further configured to receive the light-emitting control signal from the second decoding module and send the light-emitting control signal when receiving the second control signal.
It can be understood that the control module is configured to send the first control signal or the second control signal to the first decoding module and the second decoding module, that is, the control module is configured to send the first control signal to the first decoding module and send the first control signal to the second decoding module, or the control module is configured to send the second control signal to the first decoding module and the second decoding module. The control module is used for sending a first control signal to the first decoding module and the second decoding module at the same time or sending a second control signal to the first decoding module and the second decoding module at the same time.
It should be noted that the first decoding module has a first connection interface and a second connection interface, the second decoder has a third connection interface and a fourth connection interface, when the first decoding module receives the first control signal, the first connection interface is used as an input end, the second connection interface is used as an output end, when the first decoding module receives the second control signal, the first connection interface is used as an output end, the second connection interface is used as an input end, similarly, when the second decoding module receives the first control signal, the third connection interface is used as an input end, the fourth connection interface is used as an output end, when the second decoding module receives the second control signal, the third connection interface is used as an output end, and the fourth connection interface is used as an input end.
Notably, the light emission control signal includes: a clock signal CLK, a latch signal LAT, an output enable signal OE, and row select signals a, B, C.
By arranging the first decoding module and the second decoding module, when the first decoding module and the second decoding module both receive the first control signal, the first decoding module receives the light-emitting control signal and sends the light-emitting control signal through the second decoding module, so that the next cascaded first decoding module receives the light-emitting control signal, when the first decoding module and the second decoding module both receive the second control signal, the second decoding module receives the light-emitting control signal and sends the light-emitting control signal through the first decoding module, so that the next cascaded second decoding module receives the light-emitting control signal, and the decoding module can receive the control signal sent by the control module, thereby facilitating the bidirectional transmission of the light-emitting control signal.
In order to facilitate the decoding module to send or receive the light emitting control signal, in one embodiment, referring to fig. 5 and 6, the LED display cascade circuit further includes a first interface module JP1 and a second interface module JP2, the first interface module JP1 is connected to the first decoding module 510, and the second interface module JP2 is connected to the second decoding module 520. By arranging the first interface module and the second interface module, the first interface module is connected with the first decoding module, the first decoding module can receive or send the light-emitting control signal through the first interface module, the second interface module is connected with the second decoding module, the second decoding module can receive or send the light-emitting control signal through the second interface module, and when a user needs to cascade the decoding modules, only the first interface module and the next cascaded second interface module are needed to be cascaded, or the second interface module and the next cascaded second interface module are needed to be cascaded, so that the decoding modules can send or receive the light-emitting control signal conveniently.
In order to facilitate the LED driving module to receive the light emitting control signal, in one embodiment, please refer to fig. 3 and fig. 5, the first decoding module 510 and the second decoding module 520 are respectively connected to the LED driving module 300, and by respectively connecting the first decoding module and the second decoding module to the LED driving module, the light emitting control signal is sent to the LED driving module through the first decoding module or the second decoding module, so that the LED driving module can receive the light emitting control signal conveniently.
In order to facilitate the first signal selection module and the second signal selection module to receive or send the light emitting signal, in one embodiment, please refer to fig. 2a, fig. 2b and fig. 6, the LED display cascade control circuit further includes a first interface module JP1 and a second interface module JP2, the first interface module JP1 is connected to the first connection terminal, and the second interface module JP2 is connected to the second connection terminal. It can be understood that the light-emitting signal can be sent from the signal adapting card or from the previous cascade circuit, by providing the first interface module and the second interface module, the first interface module is connected with the first connection end, the second interface module is connected with the second connection end, and then the first interface module or the second interface module is in butt joint with the signal adapting card, or the first interface module is connected with the second interface module of the next cascade, or the second interface module is connected with the first interface module of the next cascade, the cascade of the circuit can be realized, so that the first signal selection module and the second signal selection module can receive or send the light-emitting signal conveniently.
For the convenience of users, referring to fig. 1 to 7, in one embodiment, the LED display cascade control circuit 10 further includes a first interface module JP1, a second interface module JP2, a first decoding module 510 and a second decoding module 520, the first interface module JP1 is connected with the first connecting end, the second interface module JP2 is connected with the second connecting end, the first interface module JP1 is further connected to the first decoding module 510, the second interface module JP2 is further connected to the second decoding module 520, the control module 300 is connected to the first interface module JP1 and the second interface module JP2 respectively, the first decoding module 510 is connected to the second decoding module 520, the control module 300 is respectively connected to the first decoding module 510 and the second decoding module 520, the first decoding module 510 and the second decoding module 520 are respectively connected to the LED driving module. Therefore, a user can receive the light-emitting signal, the light-emitting control signal and the adjusting signal in the signal switching card by using the first interface module or the second interface module for being in butt joint with the signal switching card, and the light-emitting signal, the light-emitting control signal and the adjusting signal can be received by the first interface module and sent by the second interface module or received by the second interface module and sent by the first interface module by butt joint of the first interface module and the next cascaded second interface module or butt joint of the second interface module and the next cascaded first interface module, so that the light-emitting control signal and the adjusting signal can be conveniently used by the user, the length of the cascaded cable can be further reduced, and the production and manufacturing cost is reduced.
In one embodiment, as shown in fig. 2-7, the first signal selection module and the second signal selection module are FST16292, the first decoding module and the second decoding module are 74HC245, the control module is 74HC04, the first output terminal of the control module is connected to the SO pin of the first signal selection module and the DIR pin of the first decoding module, the second output terminal of the control module is connected to the SO pin of the second signal selection module and the DIR pin of the second decoding module, the first input terminal of the control module is connected to the 16 th pin of the first interface module and the 16 th pin of the second interface module, the first connection terminal and the second connection terminal are pins 1a1, 2a1 and 3a1 … … of the signal selection module, the first input terminal and the second input terminal are pins 1B1, 2B1 and 3B1 … … of the signal selection module, and the first output terminal and the second output terminal are pins 1B2 of the signal selection module, 2B2, 3B2 … … pin. Specifically, when the first interface module is connected with the signal adapter card, the first interface module receives an adjusting signal, a light-emitting signal and a light-emitting control signal in the signal adapter card, the first interface module sends the adjusting signal to the control module, so that the light-emitting signal is sent to the second interface module sequentially through the first signal selection module, the LED driving module and the second signal selection module, the light-emitting control signal is sent to the second interface module sequentially through the first decoding module and the second decoding module, the adjusting signal is sent to the second interface module through the control module, so that the second interface module receives the adjusting signal, the light-emitting signal and the light-emitting control signal, and the second interface module is connected with the first interface module in the next cascade circuit; when the second interface module is connected with the signal adapter card, the second interface module receives an adjusting signal, a light-emitting signal and a light-emitting control signal in the signal adapter card, the second interface module sends the adjusting signal to the control module, the light-emitting signal is sent to the first interface module through the second signal selection module, the LED driving module and the first signal selection module in sequence, the light-emitting control signal is sent to the first interface module through the second decoding module and the first decoding module in sequence, the adjusting signal is sent to the first interface module through the control module, the first interface module receives the adjusting signal, the light-emitting signal and the light-emitting control signal, and the first interface module is connected with the second interface module in the next cascade circuit.
It should be noted that fig. 2 to 7 illustrate the cascade control principle of the emission signal by taking the red light signal in the emission signal as an example, the cascade control principle of the green light signal and the blue light signal in the emission signal is the same as the cascade control principle of the red light signal, and fig. 2 to 7 illustrate the cascade control principle of the emission control signal by taking the clock signal CLK and the latch signal LAT in the emission control signal as an example, and the cascade control of the output enable signal OE and the row select signals a, B, and C in the emission control signal is the same as the cascade control principle of the clock signal CLK and the latch signal LAT, so that the technical solution of the present application cannot be limited by only the red light signal, the clock signal CLK, and the latch signal LAT in fig. 2 to 7.
In one embodiment, the LED display cascade control circuit includes two LED display cascade control circuits, wherein a control module of one of the LED display cascade control circuits is configured to send a first control signal to the first signal selection module and a second control signal to the second signal selection module, so that a light emitting signal received by the LED display cascade control circuit is sent to a first signal selection module of a next cascade through the first signal selection module, the LED driving module and the second signal selection module in sequence, and a control module of the other LED display cascade control circuit is configured to send a second control signal to the first signal selection module and send a first control signal to the second signal selection module, so that a light emitting signal received by the LED display cascade control circuit is sent to a second signal selection module of a next cascade through the second signal selection module, the LED driving module and the second signal selection module in sequence, the two LED display cascade control circuits respectively realize the transmission of light-emitting signals from left to right and from right to left, namely, realize the data split.
In one embodiment, an LED display screen is provided, which includes the LED display cascade control circuit described in any of the above embodiments.
In this embodiment, the LED display screen includes a plurality of LEDs and LED display cascade control circuits, where the LEDs are arranged in a matrix, the LEDs of each matrix are connected to an LED driving module of an LED display cascade control circuit, and the LEDs of each matrix illuminate according to a light emitting signal and a light emitting control signal received by the LED driving module.
In the LED display cascade control circuit, when the control module sends a first control signal to the first signal selection module and sends a second control signal to the second signal selection module, the first signal selection module acquires a luminous signal from the upper cascade circuit, sends the luminous signal to the second signal selection module, and sends the luminous signal to the next cascade circuit by the second signal selection module, otherwise, when the control module sends the first control signal to the second signal selection module and sends the second control signal to the first signal selection module, the second signal selection module acquires the luminous signal from the upper cascade circuit, sends the luminous signal to the first signal selection module, and sends the luminous signal to the next cascade circuit by the first signal selection module, so that the first signal selection module and the second signal selection module can receive the luminous signal and send the luminous signal, and the input direction and the output direction are not required to be selected during installation, the expansion cascade is more convenient, the compatibility among products is increased, the production cost is reduced, and the after-sale maintenance is facilitated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An LED display cascade control circuit, comprising: the LED driving circuit comprises a first signal selection module, a second signal selection module, a control module and an LED driving module;
the first signal selection module is provided with a first connecting end, a first signal output end and a first signal input end, the second signal selection module is provided with a second connecting end, a second signal output end and a second signal input end, the first signal output end and the second signal output end are respectively connected with the input end of the LED driving module, the first signal input end and the second signal input end are respectively connected with the output end of the LED driving module, and the control module is respectively connected with the first signal selection module and the second signal selection module;
the control module is used for sending a second control signal to the second signal selection module when sending a first control signal to the first signal selection module, and is also used for sending a first control signal to the second signal selection module when sending a second control signal to the first signal selection module;
the first signal selection module is used for receiving a first light-emitting signal through the first connection end when receiving the first control signal, and sending the first light-emitting signal to the input end of the LED driving module through the first signal output end; the second signal selection module is configured to receive the first light-emitting signal from the output end of the LED driving module through the second signal input end and send the first light-emitting signal through the second connection end when receiving the second control signal;
the second signal selection module is further configured to receive a second light emitting signal through the second connection end when receiving the first control signal, and send the second light emitting signal to the input end of the LED driving module through the second signal output end; the first signal selection module is further configured to receive the second light-emitting signal from the output end of the LED driving module through the first signal input end and send the second light-emitting signal through the first connection end when receiving the second control signal;
the first signal selection module and the second signal selection module are multi-channel one-out-of-two electronic switches;
the LED driving module is used for receiving the first light-emitting signal, driving an LED according to the first light-emitting signal, receiving the second light-emitting signal and driving the LED according to the second light-emitting signal.
2. The LED display cascade control circuit of claim 1, wherein the control module is configured to send the first control signal to the first signal selection module and send the second control signal to the second signal selection module by receiving a first adjustment signal, and the control module is further configured to receive a second adjustment signal, send the second control signal to the first signal selection module, and send the first control signal to the second signal selection module.
3. The LED display cascade control circuit of claim 1, further comprising a signal adapter card, wherein the signal adapter card is connected to the control module, the control module is configured to receive an adjustment signal from the signal adapter card, and the control module is configured to generate the first control signal and the second control signal by receiving the adjustment signal.
4. The LED display cascade control circuit of claim 3, wherein the control module is an inverter, a first input terminal of the inverter is connected to the signal adapter, a first output terminal of the inverter is connected to a second input terminal of the inverter, the first output terminal of the inverter is further connected to the first signal selection module, and the second output terminal of the inverter is connected to the second signal selection module.
5. The LED display cascade control circuit of claim 3, further comprising a first interface module and a second interface module, wherein the control module is connected to the first interface module and the second interface module respectively, and the first interface module and the second interface module are connected to the signal adapter card respectively.
6. The LED display cascade control circuit according to claim 1, further comprising a first decoding module and a second decoding module, wherein the first decoding module is connected to the second decoding module, the control module is respectively connected to the first decoding module and the second decoding module, and the control module is configured to send the first control signal or the second control signal to the first decoding module and the second decoding module;
the first decoding module is used for receiving a light-emitting control signal and sending the light-emitting control signal to the second decoding module when receiving the first control signal; the second decoding module is used for receiving the light-emitting control signal from the first decoding module and sending the light-emitting control signal when receiving the first control signal;
the second decoding module is further configured to receive the light emission control signal and send the light emission control signal to the first decoding module when receiving the second control signal; the first decoding module is further configured to receive the light-emitting control signal from the second decoding module and send the light-emitting control signal when receiving the second control signal.
7. The LED display cascade control circuit of claim 6, further comprising a first interface module and a second interface module, wherein the first interface module is connected to the first decoding module, and the second interface module is connected to the second decoding module.
8. The LED display cascade control circuit of claim 6, wherein the first decoding module and the second decoding module are respectively connected to the LED driving module.
9. The LED display cascade control circuit of claim 1, further comprising a first interface module and a second interface module, wherein the first interface module is connected to the first connection terminal, and the second interface module is connected to the second connection terminal.
10. An LED display screen comprising an LED display cascade control circuit as claimed in any one of claims 1 to 9.
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