CN117116199A - LED display screen system and driving method - Google Patents
LED display screen system and driving method Download PDFInfo
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- CN117116199A CN117116199A CN202311360038.5A CN202311360038A CN117116199A CN 117116199 A CN117116199 A CN 117116199A CN 202311360038 A CN202311360038 A CN 202311360038A CN 117116199 A CN117116199 A CN 117116199A
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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 application relates to an LED display screen system and a driving method. The system comprises: the first signal output end of the control module is connected with the first input end of the first-stage driving circuit, and sequentially passes through the data output end of the previous-stage driving circuit and the first input end of the next-stage driving circuit to connect the plurality of driving circuits in series; the control module sends data signals to the plurality of driving circuits through the first signal output end; transmitting carrier clock signals to the plurality of driving circuits through the second signal output end; the driving circuit decodes the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; and executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data. By adopting the system, the wiring can be simplified, and the port utilization rate is improved.
Description
Technical Field
The application relates to the technical field of LED display, in particular to an LED display screen system and a driving method.
Background
With the development of society, LED display systems have been widely used for displaying characters and patterns. The LED display screen has the following advantages: high gray scale, wide viewing angle, rich colors, and customizable screen shape. Therefore, the LED display is widely used in various fields of industry, traffic, commercial advertisement, information distribution, sports, etc.
As shown in fig. 1, the basic structure of the LED display system includes a control terminal and a driving IC. The control terminal generally includes a plurality of output ports, and each of the plurality of output ports is connected to a set of driver ICs. Each group of ports of the control end outputs a clock signal (CLK), a counting clock signal (GCLK), a Latch signal (Latch) and a Data signal (Data), the clock signal (CLK), the counting clock signal (GCLK) and the Latch signal (Latch) are provided for each driving IC in one group in parallel, and the Data signal (Data) is serially connected and transferred in each group of driving ICs in sequence. The Data signal (Data) is mainly used for transmitting the corresponding display Data to each driving IC; a clock signal (CLK) for providing a shift clock of homology to each of the drive ICs; a count clock signal (GCLK) for supplying a count clock for PWM display to each driving IC; latch signals (latches) are typically used to transfer some operational information, such as data Latch operations, to the respective driver ICs. However, such arrangement of signal lines independent of each other results in a large number of signal lines of the LED display device, a complicated wiring area, and low expansibility and availability of the driver ICs in the case where the number of ports and surrounding space of each driver IC are limited.
Therefore, the LED display screen system in the related art still has the problems of complex wiring and low port availability.
Disclosure of Invention
In view of the above, it is necessary to provide an LED display system and a driving method that can simplify wiring and improve the port availability.
In a first aspect, the present embodiment provides an LED display screen system, the display screen system including a control module and a plurality of driving circuits, wherein:
the control module comprises a first signal output end and a second signal output end; the driving circuit comprises a first input end, a second input end and a data output end;
the first signal output end of the control module is connected with the first input end of the driving circuit of the first stage, and sequentially passes through the data output end of the driving circuit of the previous stage and the first input end of the driving circuit of the next stage, so that a plurality of driving circuits are connected in series;
the second signal output ends of the control modules are respectively connected with the second input ends of the driving circuits;
the control module sends data signals to a plurality of driving circuits through a first signal output end; transmitting carrier clock signals to a plurality of driving circuits through a second signal output end;
the driving circuit is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; and executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data.
In one of the embodiments of the present application,
when the control module sends a data signal to the driving circuit, the carrier clock signal sent by the control module to the driving circuit only comprises a clock signal.
In one embodiment, the driving circuit includes a decoding memory module and a display driving module, wherein:
the decoding storage module is connected with the display driving module and is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; executing the operation corresponding to the instruction information, and storing the parameter information and the display data;
and the display driving module is used for reading the parameter information and the display data and driving the LED to display based on the parameter information and the display data.
In one embodiment, the decoding storage module includes: the decoding module, the video memory unit and the configuration parameter register;
the decoding module is respectively connected with the video memory unit and the configuration parameter register and is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; executing the operation corresponding to the instruction information and transmitting the parameter information to a configuration parameter register; decoding the data signal to obtain display data of the driving circuit, and transmitting the display data to a display unit;
the video memory unit is connected with the display driving module and used for storing the display data;
the configuration parameter register is connected with the display driving module and used for storing parameter information.
In one of the embodiments of the present application,
the decoding module is further configured to determine the instruction information and/or the parameter information based on a proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods.
In one embodiment, the display driving module includes a display processing module and a constant current driving module, wherein:
the display processing module is used for reading the parameter information and the display data and sending a control instruction to the constant current driving module based on the parameter information and the display data;
and the constant current driving module is used for driving the LEDs to display based on the control instruction.
In one of the embodiments of the present application,
the control module configures identification information for a plurality of driving circuits through the first signal output end;
the driving circuit is used for decoding display data corresponding to the identification information from the data signal according to the identification information.
In one embodiment, the driving circuit is further configured to receive a latch signal and store the display data based on the latch signal.
In a second aspect, the present embodiment provides a driving method of an LED display screen, applied to a driving circuit as described above, the method including:
receiving a carrier clock signal and a data signal output by a control module;
decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit;
decoding the data signal to obtain display data of the driving circuit;
and executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data.
In one embodiment, the decoding the carrier clock signal to obtain the instruction information and/or the parameter information corresponding to the driving circuit includes:
the instruction information and/or parameter information is determined based on the proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods.
In one embodiment, the decoding the data signal to obtain the display data of the driving circuit includes:
acquiring identification information corresponding to the driving circuit, which is sent by the control module;
and decoding display data corresponding to the identification information from the data signal according to the identification information.
According to the LED display screen system and the driving method, the first signal output end of the control module is connected with the first input end of the first-stage driving circuit, and the data output end of the previous-stage driving circuit is sequentially connected with the first input end of the next-stage driving circuit in series to connect the plurality of driving circuits; the control module sends data signals to the plurality of driving circuits through the first signal output end; transmitting carrier clock signals to the plurality of driving circuits through the second signal output end; the driving circuit decodes the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; the operation corresponding to the instruction information is executed, and the LED is driven to display based on the parameter information and the display data, so that relevant instructions such as data storage and display and relevant configuration parameter information for display can be transmitted in a carrier wave form in a clock signal, display data synchronization can be realized only by the data signal and the clock signal between the control end and the driving modules, wiring simplification is realized, occupied ports of each driving module are reduced, and effects of simplifying the wiring and improving the port utilization rate are achieved.
Drawings
FIG. 1 is a block diagram of the basic structure of a prior art LED display system;
FIG. 2 is a block diagram of an LED display system in one embodiment;
FIG. 3 is a block diagram of a driving circuit in one embodiment;
FIG. 4 is a timing diagram of the control module output in one embodiment;
fig. 5 is a flow chart of a method for driving an LED display screen according to an embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 2, an LED display screen system is provided, the display screen system comprising a control module 100 and a plurality of driving circuits 200, wherein:
the control module 100 includes a first signal output terminal and a second signal output terminal; the driving circuit 200 includes a first input terminal, a second input terminal, and a data output terminal;
the first signal output end of the control module 100 is connected with the first input end of the driving circuit 200 of the first stage, and sequentially passes through the data output end of the driving circuit 200 of the previous stage and the first input end of the driving circuit 200 of the next stage, so as to connect a plurality of driving circuits 200 in series;
the second signal output ends of the control module 100 are respectively connected with the second input ends of the driving circuits 200;
the control module 100 sends Data signals, i.e., data signals, to the plurality of driving circuits 200 through a first signal output terminal; transmitting a carrier clock signal, i.e., a CLK signal, to the plurality of driving circuits 200 through a second signal output terminal;
the driving circuit 200 is configured to decode the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit 200; decoding the data signal to obtain display data of the driving circuit 200; and executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data.
The LED display system includes a control module 100 and a plurality of driving circuits 200, where the driving circuits 200 are sequentially connected in series through a first input terminal and a data output terminal. Each driving circuit 200 may be connected to a plurality of LED lamps for driving the plurality of LED lamps connected thereto, thereby realizing display of a part of an image area. The plurality of driving circuits 200 displaying different areas can be spliced together to obtain a complete image. The number of LED lamps may be set based on actual requirements.
The first signal output end of the control module 100 outputs a data signal to the first input end of the first driving circuit 200, and the plurality of driving circuits 200 sequentially connected in series sequentially transmit the data signal through the first input end and the data output end, so that the plurality of driving circuits 200 sequentially obtain display data corresponding to the driving circuits 200.
The display data may comprise, for example, display data, but may also be information comprising other corresponding identity information, for example, of the driving circuit. The instruction information may be a field switching instruction, and the parameter information may be a display related configuration parameter.
The second signal output terminals of the control module 100 are respectively connected to the second input terminals of the plurality of driving circuits 200, and may be that the second input terminals of the plurality of driving circuits 200 are connected in parallel to the second signal output terminals, so that the carrier clock signals sent by the second signal output terminals may be received almost simultaneously. The carrier clock signal may include instruction information and/or parameter information, and further may include instruction information and/or parameter information in a specific period. The carrier clock signal can be obtained by processing the clock signal and modulating the high-low level duty ratio in different periods of the clock signal so as to enable the clock signal to contain instruction information and/or parameter information on the premise of unchanged clock signal period.
The command information and the parameter information may be transmitted at different times, for example, at one specific time, the carrier clock signal contains only the command information, at another specific time, the carrier clock signal contains only the parameter information, and at another specific time, for example, the carrier clock signal contains both the command information and the parameter information.
Further, in order to improve transmission efficiency of the instruction information and/or the parameter information, the instruction information and/or the parameter information may be in a coded form. The driving circuit 200 decodes the carrier clock signal to obtain the instruction information and/or parameter information corresponding to the driving circuit 200, which may be analysis of a plurality of cycle duty cycles of the carrier clock signal to obtain a corresponding code, and analyzes the instruction information and/or parameter information corresponding to the code. It is to be understood that the instruction information and/or the parameter information may be set accordingly based on the display logic of the driving circuit 200, and the encoding of the instruction information and/or the parameter information may also be set based on the actual requirement, which is not limited in this embodiment.
It can be understood that, compared with the control module in the prior art, a plurality of signal lines are respectively arranged for a plurality of driving modules, and corresponding signal receiving ports are arranged in each driving circuit, the LED display screen system of the embodiment sets the signal lines and the clock lines related to instructions and parameter information by original branching, adjusts the signal lines and the clock lines to be transmitted in a carrier mode through a single carrier clock signal, can effectively reduce the number of the signal lines, simplify wiring, and reduce the occupied ports of each driving module, thereby improving the port utilization rate.
In the LED display system provided in this embodiment, a first signal output end of a control module is connected to a first input end of a first stage driving circuit, and sequentially passes through a data output end of a previous stage driving circuit and a first input end of a next stage driving circuit, so as to connect a plurality of driving circuits in series; the control module sends data signals to the plurality of driving circuits through the first signal output end; transmitting carrier clock signals to the plurality of driving circuits through the second signal output end; the driving circuit decodes the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; the operation corresponding to the instruction information is executed, and the LED is driven to display based on the parameter information and the display data, so that relevant instructions such as data storage and display and relevant configuration parameter information for display can be transmitted in a carrier wave form in a clock signal, display data synchronization can be realized only by the data signal and the clock signal between the control end and the driving modules, wiring simplification is realized, occupied ports of each driving module are reduced, and effects of simplifying the wiring and improving the port utilization rate are achieved.
In one embodiment, when the control module sends a data signal to the drive circuit, the carrier clock signal sent by the control module to the drive circuit includes only a clock signal.
Wherein, the data signal and the carrier clock signal are divided into two paths for transmission. For example, when the control module sends a data signal to the driving circuit, the driving circuit may perform progressive shift based on driving of the clock signal, so as to obtain data corresponding to the driving circuit.
When the control module sends a data signal to the driving circuit, the sent carrier clock signal may be a clock signal with equal duty cycle of each period. The instruction information and/or the parameter information may be transmitted by modulation of the clock signal before or after transmission of the data signal, thereby enabling separate transmission of the instruction and the parameter and the display data.
According to the LED display screen system, when the control module sends the data signals to the driving circuit, the sent carrier clock signals only comprise clock signals, and correspondingly, the carrier clock signals containing the instruction information and/or the parameter information are sent in the time when the control module does not send the data signals, so that one or more of the clock signals, the instruction information and the parameter information can be selectively transmitted in the data transmission process, and the effect of improving the signal transmission flexibility of the LED display screen system is achieved.
In one embodiment, the driving circuit includes a decoding memory module and a display driving module, wherein:
the decoding storage module is connected with the display driving module and is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; executing the operation corresponding to the instruction information, and storing the parameter information and the display data;
and the display driving module is used for reading the parameter information and the display data and driving the LED to display based on the parameter information and the display data.
The first input terminal, the second input terminal and the data output terminal of the driving circuit may be the first input terminal, the second input terminal and the data output terminal of the decoding memory module.
The decoding storage module receives a data signal sent by a first signal output end of the control module or a data output end of a previous-stage driving circuit through a first input end, decodes the data signal to obtain display data corresponding to the driving circuit, and stores the display data. The decoding storage module receives the carrier clock signal sent by the second signal output end of the control module through the second input end, decodes the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit, executes operation corresponding to the instruction information and stores the parameter information.
The display driving module reads the parameter information and the display data, which can be reading the information of the storage medium in the decoding storage module, and drives and displays the LED based on the display data and the parameter information. The display driving module may drive the LEDs for display in a constant current driving manner.
In one embodiment, the decoding storage module includes: the decoding module, the video memory unit and the configuration parameter register;
the decoding module is respectively connected with the video memory unit and the configuration parameter register and is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; executing the operation corresponding to the instruction information and transmitting the parameter information to a configuration parameter register; decoding the data signal to obtain display data of the driving circuit, and transmitting the display data to a display unit;
the video memory unit is connected with the display driving module and used for storing the display data;
the configuration parameter register is connected with the display driving module and used for storing parameter information.
The decoding module receives the data signal from the first signal output end or the data output end, decodes the data signal based on the carrier clock signal received by the second input end to obtain display data, and sends the display data to a video memory unit connected with the display data. In this embodiment, the memory unit stores the display data, which may be the display data in the display data.
The decoding module receives the carrier clock signal from the second signal output end and decodes the carrier clock signal to obtain instruction information and/or parameter information. The decoding module executes the operation corresponding to the instruction information and sends the parameter information to the configuration parameter register. And after receiving the parameter information sent by the decoding module, the configuration parameter register stores the parameter information.
Correspondingly, the display driving module can read the display data in the video memory unit, read the parameter information of the configuration parameter register, and drive the LED to display based on the display data and the parameter information.
According to the LED display screen system provided by the embodiment, the decoding and storing processes can be respectively realized through the decoding module, the video memory unit and the configuration parameter register, the display data and the parameter information are respectively stored in the video memory unit and the configuration parameter register, namely, the display data and the parameter information are respectively stored according to the data types, and the display driving module can make faster distinction according to the source of the read data, so that the driving display efficiency and stability are improved.
In one embodiment, the decoding module is further configured to determine the instruction information and/or the parameter information based on a proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods.
The instruction information and/or the parameter information are determined based on the proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods, and the proportion of the high level and the low level in a single signal period can be set based on actual requirements. When the instruction information and the parameter information are transmitted in the encoded form, the instruction information and the parameter information may be encoded in a binary manner or may be encoded in other binary manners. Correspondingly, the proportion of the high level and the low level can be correspondingly encoded according to a system, and the encoding length can be set based on actual requirements. For example, when binary codes are used, the ratio of 2:1 and 1:2 of the high level to the low level may be used to represent 1 and 0, and each signal period may determine one bit of the codes, so as to obtain codes corresponding to instruction information and/or parameter information.
According to the LED display screen system provided by the embodiment, the instruction information and/or the parameter information are determined based on the proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods, so that decoding of the additional instruction information and/or the parameter information can be completed on the premise of keeping the clock signal, and complete transmission of data is realized.
In one embodiment, the control module configures identification information for a plurality of driving circuits through the first signal output terminal;
the driving circuit is used for decoding display data corresponding to the identification information from the data signal according to the identification information.
The control end configures the identification information for each driving circuit through a data signal before the display starts, each driving circuit stores the respective identification information in a corresponding storage space, the control end sequentially gives out corresponding data packets according to the identification information of the driving circuits connected in series, and each driving circuit reads corresponding data according to the identification information of the driving circuit when receiving the display data.
According to the LED display screen system provided by the embodiment, the identification information is configured for the plurality of driving circuits, and the driving circuits decode display data corresponding to the identification information from the data signals according to the identification information, so that data signal transmission corresponding to the driving circuits is realized, and the flexibility of data transmission is improved.
In one embodiment, the driving circuit is further configured to receive a latch signal and store the display data based on the latch signal.
The driving circuit may receive the latch signal through a separate communication signal line.
In one embodiment, the display driving module includes a display processing module and a constant current driving module, wherein:
the display processing module is used for reading the parameter information and the display data and sending a control instruction to the constant current driving module based on the parameter information and the display data;
and the constant current driving module is used for driving the LEDs to display based on the control instruction.
The display processing module may process the display data in combination with the parameter information, determine a control instruction corresponding to the constant current driving module, and send the control instruction to the constant current driving module. The constant current driving module can adopt a constant current driving mode to apply the constant current electric pulse signal to the LED lamp so as to convert the electric pulse signal into an optical signal.
According to the LED display screen system provided by the embodiment, the display driving module is formed by the display processing module and the constant current driving module, and the generation process of the control instruction and the driving process based on the control instruction are respectively processed by the two modules, so that the effect of improving the display driving stability can be achieved.
In order to explain the technical scheme of the application in more detail, the application also provides a detailed embodiment. An LED display system of the present embodiment includes a control module 100 and a plurality of driving circuits 200, as shown in fig. 3, the driving circuits 200 include a decoding module 210, a display unit 221, a configuration parameter register 222, a display processing module 230, and a constant current driving module 240, the control module 100 includes a first signal output terminal and a second signal output terminal, and the decoding module 210 includes a first input terminal Din, a second input terminal CLK, and a data output terminal Dout. The single driving circuit 200 may be connected with a plurality of LED lamps, in this embodiment, out0 to Out15.
The first signal output end of the control module 100 is connected with the first input end of the decoding module 210 in the first stage of the driving circuit 200, and sequentially passes through the data output end of the decoding module 210 in the previous stage of the driving circuit 200 and the first input end of the decoding module 210 in the next stage of the driving circuit 200, so as to connect a plurality of driving circuits 200 in series; the second signal output ends of the control module 100 are respectively connected with the second input ends of the decoding modules 210 in the driving circuits 200;
the control module 100 configures identification information for the plurality of driving circuits 200 through the first signal output terminal, and sends Data signals, namely Data signals, to the plurality of decoding modules 210 through the first signal output terminal; the carrier clock signal, i.e., the CLK signal, is transmitted to the plurality of driving circuits 200 through the second signal output terminal.
The control module 100 may include a plurality of first signal output ports and second signal output ports for respectively transmitting the data signals and the carrier clock signals to the plurality of driving circuits 200.
Wherein the clock signal is loaded with part of the information in the form of a carrier wave, i.e. the data signal transmits the information, and the clock signal also transmits the information. The data signal transmits different display data to each driving circuit 200 according to the serial connection characteristic of the driving circuits 200; the clock signal provided to each driving circuit 200 by the control module 100 may be the same information transmitted to each driving circuit 200 to transmit the operation or operation related information of each driving circuit 200, such as instruction information and parameters, for example, field switching instruction, display related configuration parameters, etc.
The decoding module 210 is respectively connected to the video memory unit 221 and the configuration parameter register 222, and decodes the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit 200; executing the operation corresponding to the instruction information, and transmitting the parameter information to the configuration parameter register 222; display data corresponding to the identification information is decoded from the data signal according to the identification information, and the display memory data is transferred to the display unit 221. The display unit 221 is connected to the display driving module, and is used for storing the display memory data. The configuration parameter register 222 is connected to the display driving module, and is used for storing parameter information. The decoding module 210 decodes the carrier clock signal to perform a corresponding operation according to the instruction information, or transmits the parameter information to the configuration parameter register 222.
The display processing module 230 is configured to read the parameter information and the video memory data, and send a control instruction to the constant current driving module 240 based on the parameter information and the video memory data; the constant current driving module 240 is configured to drive the LED to display based on the control instruction.
The driving circuit 200 receives and stores the data signal corresponding thereto in two ways, which are as follows:
mode 1: the driving circuit 200 receives and stores video memory data by latch signals. After the data signals of all the driving circuits 200 connected in series are transferred to the bit, the data information on the data line is synchronously stored to the display unit 221 by the latch instruction of the latch signal.
Mode 2: the control module 100 performs ID configuration on each driving circuit 200 through a data signal to realize reception and storage of display data. After the ID configuration is completed, each of the driving circuits 200 connected in series can sequentially read the display data of the present stage according to its own ID. At this time, the different information of each driving circuit 200 may also be transmitted through the carrier clock signal, the control module 100 gives corresponding data packets according to the ID sequence of the driving circuits 200 connected in series, and the driving circuit 200 reads the data packet corresponding to the current level information loaded on the clock signal according to its own ID. It should be understood that, in the case where the control terminal configures the identification information for each driving circuit, the information transmitted to each driving circuit 200 by the control terminal through the carrier clock signal may be information different for each driving circuit.
The clock signal loads part of the information in the form of a carrier wave, the waveform of which is shown in fig. 4: when the clock signal transmits part of information, such as instructions and parameters, to each driving circuit 200 by means of a carrier wave, the data signal line does not transmit information; when the data signal transmits information, the clock signal always signals 0, i.e. no information is loaded.
The 0, 1 signals of the clock signal loading information are generally identified by the ratio of high and low levels, and the 0, 1 signals shown in fig. 4 are identified in the following manner: the ratio of high to low levels is 1 when the ratio is 2:1, and 0 when the ratio is 1:2. The information represented by the instruction information or the parameter information part is, for example: 1110. the identification manner is merely an example and is not limited to the above-mentioned proportional relationship.
Accordingly, the decoding module 210 determines the clock signal based on the signal periods of the high level and the low level in the carrier clock signal, and determines the instruction information and/or the parameter information based on the clock signal and the ratio of the high level and the low level in the carrier clock signal in the plurality of signal periods.
According to the LED display screen system provided by the embodiment, the clock signals are provided for each driving circuit in each group in parallel, the instruction is sent through the carrier clock signal loading information, and the synchronicity of the transmitted instruction information and/or parameter information is higher, so that the utilization rate of the ports of the driving circuits can be improved, and the synchronicity of the transmission of the instruction information and/or parameter information can be ensured.
Based on the same inventive concept, the embodiment of the application also provides an LED display screen driving method for realizing the LED display screen system. The implementation of the solution to the problem provided by the method is similar to that described in the above system, so the specific limitation in the embodiments of the driving method of the LED display screen provided below may be referred to the limitation of the LED display screen system hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 5, there is provided an LED display screen driving method applied to the driving circuit as described above, the method including:
step S100, receiving carrier clock signals and data signals output by the control module.
Step S200, decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit.
And step S300, decoding the data signals to obtain the display data of the driving circuit.
And step S400, executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data.
In one embodiment, the decoding the carrier clock signal to obtain the instruction information and/or the parameter information corresponding to the driving circuit includes:
the instruction information and/or parameter information is determined based on the proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods.
In one embodiment, the decoding the data signal to obtain the display data of the driving circuit includes:
acquiring identification information corresponding to the driving circuit, which is sent by the control module;
and decoding display data corresponding to the identification information from the data signal according to the identification information.
In one embodiment, the data signal includes multi-level display data, and decoding the display data corresponding to the identification information from the data signal according to the identification information includes:
and reading the display data of the current stage corresponding to the identification information in the data signal based on the identification information.
In one embodiment, the obtaining the display data of the driving circuit further includes:
and receiving a latch signal and storing the display data based on the latch signal.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric RandomAccess Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can take many forms, such as static Random access memory (Static Random Access Memory, SRAM) or Dynamic Random access memory (Dynamic Random AccessMemory, DRAM), among others. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (11)
1. An LED display screen system, comprising a control module and a plurality of drive circuits, wherein:
the control module comprises a first signal output end and a second signal output end; the driving circuit comprises a first input end, a second input end and a data output end;
the first signal output end of the control module is connected with the first input end of the driving circuit of the first stage, and sequentially passes through the data output end of the driving circuit of the previous stage and the first input end of the driving circuit of the next stage, so that a plurality of driving circuits are connected in series;
the second signal output ends of the control modules are respectively connected with the second input ends of the driving circuits;
the control module sends data signals to a plurality of driving circuits through a first signal output end; transmitting carrier clock signals to a plurality of driving circuits through a second signal output end;
the driving circuit is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; and executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data.
2. The LED display screen system of claim 1, wherein,
when the control module sends a data signal to the driving circuit, the carrier clock signal sent by the control module to the driving circuit only comprises a clock signal.
3. The LED display screen system of claim 1, wherein the drive circuit comprises a decode memory module and a display drive module, wherein:
the decoding storage module is connected with the display driving module and is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; decoding the data signal to obtain display data of the driving circuit; executing the operation corresponding to the instruction information, and storing the parameter information and the display data;
and the display driving module is used for reading the parameter information and the display data and driving the LED to display based on the parameter information and the display data.
4. The LED display screen system of claim 3, wherein the decode storage module comprises: the decoding module, the video memory unit and the configuration parameter register;
the decoding module is respectively connected with the video memory unit and the configuration parameter register and is used for decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit; executing the operation corresponding to the instruction information and transmitting the parameter information to a configuration parameter register; decoding the data signal to obtain display data of the driving circuit, and transmitting the display data to a display unit;
the video memory unit is connected with the display driving module and used for storing the display data;
the configuration parameter register is connected with the display driving module and used for storing parameter information.
5. The LED display system of claim 4, wherein the LED display system is configured to display the LED display screen,
the decoding module is further configured to determine the instruction information and/or the parameter information based on a proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods.
6. The LED display screen system of claim 3, wherein the display drive module comprises a display processing module and a constant current drive module, wherein:
the display processing module is used for reading the parameter information and the display data and sending a control instruction to the constant current driving module based on the parameter information and the display data;
and the constant current driving module is used for driving the LEDs to display based on the control instruction.
7. The LED display screen system of claim 1, wherein,
the control module configures identification information for a plurality of driving circuits through the first signal output end;
the driving circuit is used for decoding display data corresponding to the identification information from the data signal according to the identification information.
8. The LED display screen system of claim 1, wherein,
the driving circuit is also used for receiving a latch signal and storing the display data based on the latch signal.
9. A method of driving an LED display screen, applied to the LED display screen system according to any one of claims 1 to 8, the method comprising:
receiving a carrier clock signal and a data signal output by a control module;
decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit;
decoding the data signal to obtain display data of the driving circuit;
and executing the operation corresponding to the instruction information, and driving the LED to display based on the parameter information and the display data.
10. The method of claim 9, wherein decoding the carrier clock signal to obtain instruction information and/or parameter information corresponding to the driving circuit comprises:
the instruction information and/or parameter information is determined based on the proportion of the high level and the low level in the carrier clock signal in a plurality of signal periods.
11. The LED display screen driving method of claim 9, wherein decoding the data signal to obtain the display data of the driving circuit comprises:
acquiring identification information corresponding to the driving circuit, which is sent by the control module;
and decoding display data corresponding to the identification information from the data signal according to the identification information.
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