CN117953814A - LED display system, control method of LED display system, computer device and storage medium - Google Patents
LED display system, control method of LED display system, computer device and storage medium Download PDFInfo
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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]
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
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Abstract
The invention relates to the technical field of LEDs, and discloses an LED display system, a control method of the LED display system, computer equipment and a storage medium, wherein the LED display system can compensate the constant current on time of constant current sources by arranging compensation units which are equal to the number of the constant current sources in a constant current driving module in driving circuits, so that the number of constant current driving groups which are in a constant current on state in each driving circuit group in a series driving circuit is equal, and the problems that the driving circuits in a series current path abnormally heat and the service life is influenced are solved.
Description
Technical Field
The invention relates to the technical field of LEDs, in particular to an LED display system, a control method of the LED display system, computer equipment and a storage medium.
Background
Fig. 1 is a schematic structural diagram of an example of an LED display system in the related art. The display system sequentially forms a series current path through a plurality of driving circuits in a cascading way, and each driving circuit respectively provides driving constant current for a plurality of LEDs through a plurality of constant current sources. At some time, the number of constant current sources in the constant current on state in different driving circuits may be different in the LED display system, for example, the maximum value of the number of constant current sources on is 3 and the minimum value of the number of constant current sources on is 1 in the series current path at some time. Because the total current in the serial current path is equal in all parts, for the driving circuit with fewer constant current sources, redundant current is born by the driving circuit, namely the driving circuit with the constant current sources of 1 is born by the driving circuit itself with redundant current of 2 constant current, and further, the driving circuit generates heat abnormally, and the service life is influenced.
Disclosure of Invention
In view of the above, the present invention provides an LED display system, a control method of the LED display system, a computer device, and a storage medium, so as to solve the problem that the driving circuit in the LED display system generates heat abnormally, and affects the service life thereof.
In a first aspect, an embodiment of the present invention provides an LED display system, where the LED display system includes a serial driving circuit disposed between a positive electrode of a power source terminal and a negative electrode of the power source terminal, the serial driving circuit including a plurality of driving circuit groups connected in series, where the driving circuit groups include one or more driving circuits; each driving circuit is provided with a communication module, a PWM module, a constant current driving module and a compensation module; the communication module is provided with a data input end and a data output end, the data input end of the first driving circuit is connected with the control end, and the plurality of driving circuits are sequentially connected in series with the data input end through the data output end to form a serial data path; the communication module is used for receiving the data signal issued by the serial data channel through the data input end, extracting display data and compensation data corresponding to the current-stage driving circuit from the data signal, and forwarding the data signal to the subsequent-stage driving circuit through the data output end; the PWM module is used for receiving the display data sent by the communication module and controlling the constant current driving module to perform constant current output according to the display data; the constant current driving module comprises one or more constant current sources, and each constant current source is used for providing driving constant current for a corresponding LED under the control of the PWM module; the compensation module comprises compensation units, the number of the compensation units in the compensation module is equal to that of the constant current sources in the constant current driving module, the compensation units and the constant current sources are in one-to-one correspondence to form one or more constant current driving groups, the compensation units are used for receiving compensation data sent by the communication module and compensating the constant current starting time of the corresponding constant current sources according to the compensation data, so that the number of constant current driving groups in a constant current starting state in each driving circuit group in the series driving circuit is equal.
According to the LED display system provided by the embodiment of the invention, the compensation units which are equal to the constant current sources in the constant current driving modules are arranged in the driving circuits, so that the constant current starting time of the constant current sources can be compensated, the number of constant current driving groups which are in a constant current starting state in each driving circuit group in the serial driving circuits is equal, and the problems that the driving circuits in the serial current channels abnormally heat and the service life is influenced are solved.
In an alternative embodiment, the driving circuit group includes a first driving circuit, and the constant current driving module of the first driving circuit includes a plurality of parallel constant current sources.
That is, for the LED display system including one first driving circuit, the constant current on time of the constant current source can be compensated, so that the number of constant current driving groups in a constant current on state in each driving circuit group in the series driving circuit is equal, and the problem that the driving circuit in the series current path generates heat abnormally and affects the service life is solved.
In an alternative embodiment, the driving circuit group includes a plurality of second driving circuits, and the constant current driving module of the second driving circuits includes a constant current source; or alternatively; the driving circuit group comprises a plurality of third driving circuits, and the constant current driving module of the third driving circuits comprises a plurality of parallel constant current sources.
That is, for the LED display system including the plurality of second driving circuits or the plurality of third driving circuits, the constant current on time of the constant current source can be compensated, so that the number of constant current driving groups in the constant current on state in each driving circuit group in the series driving circuits is equal, and the problems that the driving circuits in the series current path abnormally generate heat and affect the service life are solved.
In a second aspect, an embodiment of the present invention provides a control method of an LED display system, where the LED display system includes a serial driving circuit disposed between a positive electrode of a power supply terminal and a negative electrode of the power supply terminal, the serial driving circuit including a plurality of driving circuit groups connected in series, where the driving circuit groups include one or more driving circuits; each driving circuit is provided with a communication module, a PWM module, a constant current driving module and a compensation module; the communication module is provided with a data input end and a data output end, the data input end of the first driving circuit is connected with the control end, and the plurality of driving circuits are sequentially connected in series with the data input end through the data output end to form a serial data path; the communication module is used for receiving the data signal issued by the serial data channel through the data input end, extracting display data and compensation data corresponding to the current-stage driving circuit from the data signal, and forwarding the data signal to the subsequent-stage driving circuit through the data output end; the PWM module is used for receiving the display data sent by the communication module and controlling the constant current driving module to perform constant current output according to the display data; the constant current driving module comprises one or more constant current sources, and each constant current source is used for providing driving constant current for a corresponding LED under the control of the PWM module; the compensation module comprises compensation units, the number of the compensation units in the compensation module is equal to that of the constant current sources in the constant current driving module, the compensation units and the constant current sources are in one-to-one correspondence to form one or more constant current driving groups, the compensation units are used for receiving compensation data sent by the communication module and compensating constant current starting time of the corresponding constant current sources according to the compensation data, and all the constant current sources included in the driving circuit group form the constant current source group; the control method of the LED display system comprises the following steps: numbering a plurality of constant current sources belonging to the same constant current source group respectively to obtain a numbering result of the constant current sources contained in each constant current source group; grouping constant current sources with the same number into one group according to the numbering result of all constant current source groups in the LED display system to obtain a plurality of numbered groups; obtaining the compensation duration of each constant current source according to the constant current starting duration of a plurality of constant current sources belonging to the same number group; and sending the compensation time length and the display data of each constant current source to a driving circuit corresponding to each constant current source through a serial data channel, so that after the driving circuit performs display driving and constant current compensation, the number of constant current driving groups in a constant current on state in each driving circuit group in the serial driving circuit is equal.
According to the control mode of the LED display system, a plurality of constant current sources belonging to the same constant current source group are numbered respectively, so that the numbering result of the constant current sources contained in each constant current source group is obtained; grouping constant current sources with the same number into one group according to the numbering result of all constant current source groups in the LED display system to obtain a plurality of numbered groups; according to the constant current starting time length of a plurality of constant current sources belonging to the same serial number group, the compensation time length of each constant current source is obtained, so that the number of constant current driving groups in a constant current starting state in each driving circuit group in the serial driving circuit is equal, and the problem that the driving circuit in the serial current path abnormally heats and influences the service life can be solved.
In an alternative embodiment, numbering the plurality of constant current sources belonging to the same constant current source group, respectively, and obtaining the numbering result of the constant current sources included in each constant current source group includes: for any constant current source group i, acquiring the constant current starting time length of each constant current source belonging to the constant current source group i; sequencing the constant current sources belonging to the constant current source group i according to the constant current starting time of each constant current source belonging to the constant current source group i, numbering the constant current sources contained in the constant current source group i according to the sequencing result, and obtaining the number of each constant current source contained in the constant current source group i; traversing all constant current source groups in the LED display system to obtain the serial numbers of the constant current sources contained in each constant current source group in the LED display system.
Therefore, constant current sources with smaller constant current opening time difference can be divided into a number group, so that the determination of the compensation time is more reasonable.
In an alternative embodiment, obtaining the compensation duration of each constant current source according to the constant current on durations of a plurality of constant current sources belonging to the same number group includes: for any number group j, acquiring the constant current starting time length of each constant current source belonging to the number group j; selecting the maximum value from the constant current starting time of each constant current source in the number group j to obtain the maximum value of the constant current starting time; obtaining the compensation time length of each constant current source in the number group j according to the maximum value of the constant current start time length and the constant current start time length of each constant current source in the number group j; and traversing all the numbered groups in the LED display system to obtain the compensation duration of each constant current source.
Therefore, the compensation time length can be conveniently and accurately obtained.
In an alternative embodiment, sequencing the constant current sources belonging to the constant current source group i according to the constant current on period of each constant current source belonging to the constant current source group i includes: and sequencing the plurality of constant current sources belonging to the constant current source group i according to the sequence of the constant current opening time length from less to more or from more to less, wherein when the constant current source group i comprises the plurality of constant current sources with the same constant current opening time length, the plurality of constant current sources with the same constant current opening time length can be sequenced at will.
The constant current sources can be quickly sequenced.
In an alternative embodiment, after sequencing the constant current sources belonging to the constant current source group i according to the constant current on period of each constant current source belonging to the constant current source group i, the method further comprises: when the constant current on time of the constant current source in the nth order and the constant current on time of the constant current source in the mth order in the x constant current source group are smaller than the maximum value of the constant current on time of the nth order and smaller than the maximum value of the constant current on time of the mth order, the constant current source in the nth order in the x constant current source group and the constant current source in the mth order are subjected to sequencing exchange.
Therefore, constant current sources with smaller constant current opening time difference can be divided into a number group, so that the determination of the compensation time is more reasonable.
In an alternative embodiment, after sequencing the constant current sources belonging to the constant current source group i according to the constant current on period of each constant current source belonging to the constant current source group i, the method further comprises: if the constant current on time of the p-th constant current source of the y-th constant current source group is the same as the constant current on time of the q-th constant current source of the z-th constant current source group, and the constant current on time of the q-th constant current source is the maximum value of the constant current on time of the numbered group where the q-th constant current source is located; and (3) sequencing and interchanging the p-th constant current source and the q-th constant current source of the y constant current source group.
Therefore, constant current sources with smaller constant current opening time difference can be divided into a number group, so that the determination of the compensation time is more reasonable.
In a third aspect, the present invention provides a computer device comprising: the LED display system comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, so that the control method of the LED display system in the first aspect or any corresponding embodiment of the first aspect is executed.
In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the control method of the LED display system of the first aspect or any one of the embodiments corresponding thereto.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exemplary structure of an LED display system in the related art;
FIG. 2 is a schematic diagram of an exemplary driving circuit in an LED display system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an example of a serial data path in an LED display system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an example of a driving power source and a constant current source in an LED display system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another example of a driving power supply and a constant current source in an LED display system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a driving power supply and a constant current source in an LED display system according to another embodiment of the present invention;
FIG. 7 is a flow chart of a method of controlling an LED display system according to an embodiment of the present invention;
FIG. 8 is a flow chart of another method of controlling an LED display system according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the structure of the constant current source part of the LED display system according to the embodiment of the invention;
FIG. 10 is a schematic diagram of constant current on-time of each constant current source of the display system of FIG. 9 during a display period;
fig. 11 is a schematic diagram of a hardware structure of a computer device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to avoid the problems of abnormal heating of the driving circuits in the series current paths and influence on the service life, the conduction current in each driving circuit in the series current paths at each moment must be ensured to be consistent, that is, the number of constant current sources in a constant current on state in each driving circuit in the series current paths at each moment must be ensured to be equal, so that the problems of abnormal heating of the circuits caused by overlarge current and the like can be avoided. However, in practical application, since the constant current on time of each constant current source is different, the constant current on time of a part of the constant current sources in the driving circuit needs to be compensated to ensure the normal operation of the driving circuit.
Based on the above, the embodiment of the invention provides an LED display system, which comprises a series driving circuit arranged between a positive electrode of a power supply end and a negative electrode of the power supply end, wherein the series driving circuit comprises a plurality of driving circuit groups connected in series, and one or more driving circuits are included in the driving circuit groups; each driving circuit is provided with a communication module, a PWM module, a constant current driving module and a compensation module; the communication module is provided with a data input end and a data output end, the data input end of the first driving circuit is connected with the control end, and the driving circuits are sequentially connected in series with the data input end through the data output end to form a serial data path.
The communication module is used for receiving the data signal issued by the serial data channel through the data input end, extracting display data and compensation data corresponding to the current-stage driving circuit from the data signal, and forwarding the data signal to the subsequent-stage driving circuit through the data output end.
And the PWM module is used for receiving the display data sent by the communication module and controlling the constant current driving module to perform constant current output according to the display data.
The constant current driving module comprises one or more constant current sources, and each constant current source is used for providing driving constant current for the corresponding LED under the control of the PWM module.
The compensation module comprises compensation units, the number of the compensation units in the compensation module is equal to that of the constant current sources in the constant current driving module, the compensation units and the constant current sources are in one-to-one correspondence to form one or more constant current driving groups, the compensation units are used for receiving compensation data sent by the communication module and compensating the constant current starting time of the corresponding constant current sources according to the compensation data, so that the number of constant current driving groups in a constant current starting state in each driving circuit group in the series driving circuit is equal.
Fig. 2 is a schematic diagram of a driving circuit in an LED display system according to an embodiment of the present invention. As shown in fig. 2, the driving circuit includes a communication module, 4 constant current sources (i.e., constant current source 1, constant current source 2, constant current source 3, and constant current source 4), and 4 compensation units (i.e., compensation unit 1, compensation unit 2, compensation unit 3, and compensation unit 4). The communication module is provided with a data input end Din and a data output end Dout; in addition, the driving circuit is further provided with a power input terminal Vin and a power output terminal Vout. It should be noted that, for clarity of expression, only the communication module, the constant current driving module, and the compensation module are illustrated in fig. 2, and the PWM module is not illustrated.
The LED display system includes not only a circuit connection structure (i.e., a serial driving circuit) but also a communication connection structure. Specifically, the display system is also provided with a control end for controlling constant current output of the constant current source in each driving circuit, and meanwhile, each driving circuit in the display system can be sequentially cascaded through a data input port and a data output port of the driving circuit to form one or more cascaded driving circuit groups, so that the data input port of the head end driving circuit of the cascaded driving circuit group is connected with the data port of the control end, and a serial data path of the display system is realized; and in the display process, the control end sends display data and compensation data corresponding to the constant current sources in each driving circuit to the cascade driving circuit group through the serial data path, so that the constant current sources provide driving constant current for the corresponding LEDs according to the display data. FIG. 3 is a schematic diagram of an example of a serial data path in an LED display system according to an embodiment of the present invention. As shown in fig. 3, the data input end of the first driving circuit is connected with the control end, and the plurality of driving circuits are sequentially connected in series with the data input end through the data output end to form a serial data path.
According to the LED display system provided by the embodiment of the invention, the compensation units which are equal to the constant current sources in the constant current driving modules are arranged in the driving circuits, so that the constant current starting time of the constant current sources can be compensated, the number of constant current driving groups which are in a constant current starting state in each driving circuit group in the serial driving circuits at any moment is equal, and the problems that the driving circuits in the serial current channels abnormally heat and the service life is influenced are solved.
The compensation unit of the embodiment of the invention can perform constant current compensation of corresponding time according to the compensation time, and the compensation process can be as follows: in the compensation time range before or after the constant current starting time, the compensation unit provides continuous constant current so as to enable the constant current driving group to be in a constant current starting state continuously and ensure that the LEDs are in a non-lighted state continuously, and therefore the normal display process of the LED display system is not influenced while current balance is realized. The compensation process involves a number of possible compensation modes, which the present invention is not limited to.
In an alternative embodiment, the driving circuit group includes a first driving circuit, and the constant current driving module of the first driving circuit includes a plurality of parallel constant current sources.
Fig. 4 is a schematic structural diagram of an example of a driving circuit and a constant current source in an LED display system according to an embodiment of the present invention, as shown in fig. 4, a plurality of constant current sources are disposed in the same driving circuit, the driving circuit has a plurality of parallel constant current sources therein, each constant current source is used for driving one LED, all the constant current sources corresponding to the driving circuit form a constant current source group, and a plurality of driving circuits are cascaded to form a series current path of the display system.
In an alternative embodiment, the driving circuit group includes a plurality of second driving circuits, and the constant current driving module of the second driving circuits includes a constant current source.
Fig. 5 is a schematic structural diagram of another example of a driving circuit and a constant current source in the LED display system according to the embodiment of the present invention, as shown in fig. 5, a plurality of constant current sources are disposed in a plurality of driving circuits, each driving circuit has a constant current source therein, each constant current source is used for driving one LED, a driving circuit group is formed by connecting a plurality of driving circuits in parallel, all corresponding constant current sources form a constant current source group structure, and the driving circuit groups are cascaded to form a serial current path of the display system.
In an alternative embodiment, the driving circuit group includes a plurality of third driving circuits, and the constant current driving module of the third driving circuits includes a plurality of parallel constant current sources.
Fig. 6 is a schematic structural diagram of another example of a driving circuit and a constant current source in an LED display system according to an embodiment of the present invention, as shown in fig. 6, a plurality of constant current sources are disposed in a plurality of driving circuits, each driving circuit has a plurality of parallel constant current sources therein, each constant current source is used for driving one LED, driving circuit groups formed by connecting the plurality of driving circuits in parallel, all corresponding constant current sources form a constant current source group, and the driving circuit groups are cascaded to form a serial current path of the display system.
The embodiment of the invention also provides a control method of the LED display system. It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
In an embodiment of the present invention, a control method of an LED display system is provided, which may be used in the LED display system described above, and fig. 7 is a flowchart of a control method of an LED display system according to an embodiment of the present invention, as shown in fig. 7, where the flowchart includes the following steps:
Step S701: and numbering the constant current sources belonging to the same constant current source group respectively to obtain the numbering result of the constant current sources contained in each constant current source group.
Step S702: and grouping constant current sources with the same number into one group according to the numbering result of all constant current source groups in the LED display system to obtain a plurality of numbered groups.
Step S703: and obtaining the compensation duration of each constant current source according to the constant current starting duration of a plurality of constant current sources belonging to the same number group.
Step S704: and sending the compensation time length and the display data of each constant current source to a driving circuit corresponding to each constant current source through a serial data channel, so that after the driving circuit performs display driving and constant current compensation, the number of constant current driving groups in a constant current on state in each driving circuit group in the serial driving circuit is equal.
That is, based on the above display system structure, according to the operation process of the method according to the embodiment of the present invention, the control end can obtain the constant current on time of each constant current source in the display period according to the display data corresponding to the constant current source in each driving circuit before the display period starts, and further execute the processing process of the method according to the constant current on time data, so as to finally obtain the compensation time data of each constant current source in the display period. And then display data and compensation data of each driving circuit are issued through the serial data channel, so that the driving circuit controls constant current output of the corresponding constant current source and constant current compensation of the compensation unit according to the display data and the compensation data.
According to the embodiment of the invention, the compensation time corresponding to each constant current source is obtained through the method, so that the compensation unit can perform constant current compensation of corresponding time according to the compensation time, and the compensation process can be as follows: in the compensation time range before or after the constant current starting time, the compensation unit provides continuous constant current so as to enable the constant current driving group to be in a constant current starting state continuously and ensure that the LEDs are in a non-lighted state continuously, and therefore the normal display process of the LED display system is not influenced while current balance is realized. The compensation process involves a number of possible compensation modes, which the present invention is not limited to.
In an embodiment of the present invention, a control method of an LED display system is provided, which may be used in the LED display system described above, and fig. 8 is a flowchart of another control method of an LED display system according to an embodiment of the present invention, as shown in fig. 8, where the flowchart includes the following steps:
step S801: and numbering the constant current sources belonging to the same constant current source group respectively to obtain the numbering result of the constant current sources contained in each constant current source group.
In an alternative manner, numbering a plurality of constant current sources belonging to the same constant current source group, respectively, to obtain the numbering result of the constant current sources contained in each constant current source group includes the following steps:
Step S8011: and acquiring the constant current starting time length of each constant current source belonging to the constant current source group i for any constant current source group i.
Step S8012: the constant current sources belonging to the constant current source group i are sequenced according to the constant current starting time of each constant current source belonging to the constant current source group i, and the constant current sources contained in the constant current source group i are numbered according to the sequencing result, so that the number of each constant current source contained in the constant current source group i is obtained.
In an alternative embodiment, sequencing the constant current sources belonging to the constant current source group i according to the constant current on period of each constant current source belonging to the constant current source group i includes: and sequencing the constant current sources belonging to the constant current source group i according to the sequence of the constant current on time length from less to more.
Step S8013: traversing all constant current source groups in the LED display system to obtain the serial numbers of the constant current sources contained in each constant current source group in the LED display system.
Step S802: and grouping constant current sources with the same number into one group according to the numbering result of all constant current source groups in the LED display system to obtain a plurality of numbered groups.
Step S803: and obtaining the compensation duration of each constant current source according to the constant current starting duration of a plurality of constant current sources belonging to the same number group.
Step S804: and sending the compensation time length and the display data of each constant current source to a driving circuit corresponding to each constant current source through a serial data channel, so that after the driving circuit performs display driving and constant current compensation, the number of constant current driving groups in a constant current on state in each driving circuit group in the serial driving circuit is equal.
To make the description of the process of determining the compensation time length of the embodiment of the present invention clearer, a specific example is given. Fig. 9 is a schematic diagram of a structure of a constant current source portion in an LED display system according to an embodiment of the present invention. The display system is provided with a plurality of constant current sources, and the constant current sources can provide driving constant current for corresponding LEDs; the constant current sources are connected in parallel to form a constant current source group, and then the constant current source groups are sequentially cascaded to form a series current path of the display system. Because the embodiment of the present invention is mainly directed to improving the current relationship of the serial current paths in the display system, for convenience of understanding, the embodiment of the present invention only illustrates the constant current source part and the circuit connection relationship thereof in the display system shown in fig. 9, and the serial data paths of the display system are not shown. In addition, in the embodiment of the invention, the constant current on time of each constant current source is set according to corresponding display data, and the display data is transmitted through a serial data path in a display system.
As shown in fig. 9, a series current path is formed by cascading a constant current source group formed by connecting a constant current source 1-1, a constant current source 1-2, a constant current source 1-3 and a constant current source 1-4 in parallel, a constant current source group formed by connecting a constant current source 2-1, a constant current source 2-2, a constant current source 2-3 and a constant current source 2-4 in parallel, and a constant current source group formed by connecting a constant current source 3-1, a constant current source 3-2, a constant current source 3-3 and a constant current source 3-4 in parallel. In the display system of fig. 9, which uses only 12 constant current sources, the configuration of the series current path is described, and it should be understood that the number of constant current sources in the LED display system of the present invention is not limited to the case shown in the drawings, and may be more or less, and the present invention is not limited thereto. With the display system shown in fig. 9, when the number of constant current sources in the constant current on state is different among the constant current source groups in the series current path, abnormal heat generation of the circuit can be caused, so that to avoid such adverse effects, it is necessary to ensure that the on currents of the constant current source groups at each time are consistent; taking the case that the constant current output currents of the constant current sources are identical as an example, it is necessary to ensure that the number of constant current sources in the constant current on state in each constant current source group is equal at each moment. However, in practical application, because the constant current opening time of each constant current source is different, the constant current opening time of part of the constant current sources needs to be compensated according to the constant current opening time data of each constant current source so as to ensure the normal operation of the constant current source group.
Specifically, for each constant current source group in the series current path, constant current start time of each constant current source in the constant current source group in a display period is obtained, the constant current start time of each constant current source is sequenced in the range of the constant current source group, and then the constant current start times of the constant current sources with the same sequence of sequencing results are compared among the constant current source groups according to sequencing results in the constant current source group, so that the maximum value of the constant current start time in the constant current sources with the same sequence is obtained, and the constant current start time of other constant current sources with the same sequence is compensated according to the maximum value of the constant current start time.
Fig. 10 is a schematic diagram showing the constant current on time of each constant current source in a certain display period in the display system shown in fig. 9. The constant current on time of the constant current source can be obtained from the display data corresponding to each constant current source by the control end. Before the display period starts, the control terminal may obtain the constant current on time TM of the constant current source in the display period according to the display data of each constant current source, for example, the constant current on time of the constant current source 1-1, the constant current source 1-2, etc. in the display period is 3 units of time, 6 units of time, etc.
After the constant current on time TM of each constant current source is obtained, the constant current on times of each constant current source in the constant current source group are ordered by taking the constant current source group as a unit, for example, for the 1 st constant current source group, the constant current on times of the 1 st to 4 th constant current sources in the group are ordered, so that the constant current on time sequence is the constant current source 3, the constant current source 1/the constant current source 4, the constant current source 2, and the other constant current source groups are the same, and finally the ordering result shown in table 1 can be obtained.
TABLE 1
Next, according to the sequencing result shown in table 1, the constant current on time of each constant current source in the same sequence in each constant current source group is compared to obtain the maximum value of the constant current on time of the constant current sources in the same sequence. For example, by comparing the constant current on times of the constant current sources 1-3, 2-2 and 3-4 in the 1 st order in table 1, it is known that the constant current on time corresponding to the constant current source 1-3 is the largest of the three, and the same can be obtained that the constant current on time corresponding to the constant current source 3-2 is the largest of the three, the constant current on time corresponding to the constant current source 3-3 is the largest of the three, and the constant current on time corresponding to the constant current source 3-1 is the largest of the three for the constant current source 4, and the maximum value of the constant current on time of each order is obtained.
And then, taking the whole constant current sources in the same sequence as a unit, based on the obtained maximum value of the constant current start time in the sequence, combining the constant current start time of each constant current source, and obtaining the compensation time required by each constant current source to reach the maximum value level of the constant current start time. For example, for each constant current source in the 1 st order, the maximum value of the constant current on time is 2 unit times corresponding to the constant current sources 1-3 in the 1 st constant current source group, so that the constant current on time of the constant current sources 1-3 is not required to be compensated; for the constant current source 2-2 in the 2 nd constant current source group, because the corresponding constant current driving time is 0, 2 unit time is required to be compensated for the constant current source 2-2 so that the constant current starting time reaches the maximum value level of the constant current starting time in the sequence; similarly, for the constant current sources 3 to 4 in the 3 rd constant current source group, the corresponding constant current driving time is 0, so that the constant current sources 3 to 4 need to be compensated for 2 unit time. The compensation time of each constant current source in other sequences is calculated in the same way, and finally the compensation time shown in table 2 can be obtained.
TABLE 2
In an alternative embodiment, when the constant current source group i includes a plurality of constant current sources having the same constant current on period, the plurality of constant current sources having the same constant current on period may be in any order.
For example, in the above example, the constant current source 1-1 and the constant current source 1-4 in the 1 st constant current source group have constant current on time of 3 unit time in the display period; in this case, the sorting and compensation processes and results can be interchanged, for example, in table 2, the constant current source 1-1 is brought into the 2 nd order and the constant current source 1-4 is brought into the 3rd order for processing, in fact, the sorting and interchange of the two processes can be performed, the constant current source 1-4 is brought into the 2 nd order and the constant current source 1-1 is brought into the 3rd order for processing respectively, and further the compensation time of the two processes can be interchanged in a sorting manner, namely, the constant current source 1-4 is compensated for 1 time unit and the constant current source 1-1 is compensated for 4 time units, and the effects can be achieved. The results shown in Table 3 were finally obtained.
TABLE 3 Table 3
In some alternative embodiments, after sequencing the constant current sources belonging to the constant current source group i according to the constant current on period of each constant current source belonging to the constant current source group i, the method further includes: when the constant current on time of the constant current source in the nth order and the constant current on time of the constant current source in the mth order in the x constant current source group are smaller than the maximum value of the constant current on time of the nth order and smaller than the maximum value of the constant current on time of the mth order, the constant current source in the nth order in the x constant current source group and the constant current source in the mth order are subjected to sequencing exchange.
For example, in some cases, the constant current on time of the constant current sources in the sequence in some constant current source groups may be smaller than the maximum value of the constant current on time of each sequence in the sequence, that is, the constant current on time of the constant current sources in the nth sequence and the mth sequence in the x constant current source group is smaller than the maximum value of the constant current on time of the nth sequence and is smaller than the maximum value of the constant current on time of the mth sequence; for example, in the 1 st constant current source group in table 2, the 3 rd constant current source 1-4 and the 4 th constant current source 1-2 have constant current on-time of 3 unit time and 6 unit time respectively, which are smaller than the maximum value of the 3 rd constant current on-time, namely 7 time units, and smaller than the maximum value of the 4 th constant current on-time, namely 9 unit time; in this case, the order interchange of the order of the constant current sources 1 to 4 and the order of the constant current sources 1 to 2 in the order of 3 in the constant current source group of 1 in table 2 may be performed for each of the order of n and m in the x constant current source group, and in practice, the order interchange of the processing procedures of the constant current sources 1 to 2, for example, the order of 3 and the order of 4 may be performed by bringing the constant current sources 1 to 4, and the compensation time for the constant current sources 1 to 2 may be changed to 1 unit time instead of 3 unit time, and the compensation time for the constant current sources 1 to 4 may be changed to 6 unit of operation. The results shown in Table 4 were finally obtained.
In addition, the above-described procedure is exemplified by constant current sources in both the nth order and the mth order, and in practice, a case where the constant current on time of the constant current sources in the X orders is simultaneously smaller than the maximum value of the constant current on time in the X orders may also occur, or more, and the present invention is not limited thereto.
TABLE 4 Table 4
In some alternative embodiments, after sequencing the constant current sources belonging to the constant current source group i according to the constant current on period of each constant current source belonging to the constant current source group i, the method further includes: if the constant current on time of the p-th constant current source of the y-th constant current source group is the same as the constant current on time of the q-th constant current source of the z-th constant current source group, and the constant current on time of the q-th constant current source is the maximum value of the constant current on time of the numbered group where the q-th constant current source is located; and (3) sequencing and interchanging the p-th constant current source and the q-th constant current source of the y constant current source group.
For example, in some cases, the constant current on time of a certain constant current source in a certain constant current source group may be equal to the maximum value of the constant current on time of a certain sequence in another constant current source group, that is, if the constant current on time of the p-th sequence of the y-th constant current source group is the same as the constant current on time of the q-th sequence of the z-th constant current source group, and the constant current on time of the q-th sequence of the constant current sources is the maximum value of the constant current on time of the numbered group where the q-th sequence of the constant current sources is located, for example, the constant current on time of the 4-th sequence of the constant current sources 2-4 in the 2 nd constant current source group and the 3-th sequence of the constant current sources 3-3 in the 3 rd constant current source group is 7 unit time, and the constant current on time of the 3-th sequence of the constant current on time is the maximum value of the 3 th sequence; in this case, if p is not equal to q, the p-th constant current source and the q-th constant current source of the y-th constant current source group may be sequentially interchanged, and further, for the y-th constant current source group, only the q-th constant current source after the sequential interchange may be compensated, for example, the 4-th constant current source 2-4 of the 2-th constant current source group and the 3-th constant current source 2-3 may be sequentially interchanged in the above example, and since the constant current on time of the 3-th constant current source 2-4 after the sequential interchange is 7 unit times and is equal to the maximum value of the 3-th constant current on time, it is not necessary to compensate the constant current source 2-3 of the 4-th constant current source to the maximum value of the 4-th constant current on time of 9 unit times. The results shown in Table 5 were finally obtained.
TABLE 5
After the constant current starting time of each constant current source is compensated by the method, the constant current starting time of each constant current driving group in the display period is the sum of the constant current starting time of the constant current source and the compensation time for providing constant current compensation by the corresponding compensation module, and the constant current starting time is equal to the maximum value of the constant current starting time of the serial number group; therefore, the number of constant current driving groups in a constant current on state in each driving circuit group at any time is equal.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a computer device according to an alternative embodiment of the present invention, as shown in fig. 11, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are communicatively coupled to each other using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the computer device, including instructions stored in or on memory to display graphical information of the GUI on an external input/output device, such as a display device coupled to the interface. In some alternative embodiments, multiple processors and/or multiple buses may be used, if desired, along with multiple memories and multiple memories. Also, multiple computer devices may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). One processor 10 is illustrated in fig. 11.
The processor 10 may be a central processor, a network processor, or a combination thereof. The processor 10 may further include a hardware chip, among others. The hardware chip may be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general-purpose array logic, or any combination thereof.
Wherein the memory 20 stores instructions executable by the at least one processor 10 to cause the at least one processor 10 to perform a method for implementing the embodiments described above.
The memory 20 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created from the use of the computer device of the presentation of a sort of applet landing page, and the like. In addition, the memory 20 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, memory 20 may optionally include memory located remotely from processor 10, which may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk, or solid state disk; the memory 20 may also comprise a combination of the above types of memories.
The computer device also includes a communication interface 30 for the computer device to communicate with other devices or communication networks.
The embodiments of the present invention also provide a computer readable storage medium, and the method according to the embodiments of the present invention described above may be implemented in hardware, firmware, or as a computer code which may be recorded on a storage medium, or as original stored in a remote storage medium or a non-transitory machine readable storage medium downloaded through a network and to be stored in a local storage medium, so that the method described herein may be stored on such software process on a storage medium using a general purpose computer, a special purpose processor, or programmable or special purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, a solid state disk or the like; further, the storage medium may also comprise a combination of memories of the kind described above. It will be appreciated that a computer, processor, microprocessor controller or programmable hardware includes a storage element that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the methods illustrated by the above embodiments.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (11)
1. An LED display system, comprising a series drive circuit disposed between a power supply terminal positive electrode and a power supply terminal negative electrode, the series drive circuit comprising a plurality of drive circuit groups connected in series, wherein one or more drive circuits are included in the drive circuit groups; each driving circuit is provided with a communication module, a PWM module, a constant current driving module and a compensation module; the communication module is provided with a data input end and a data output end, the data input end of a first driving circuit is connected with the control end, and a plurality of driving circuits are sequentially connected in series with the data input end through the data output end to form a serial data path;
The communication module is used for receiving the data signal issued by the serial data channel through the data input end, extracting display data and compensation data corresponding to the driving circuit of the stage from the data signal, and forwarding the data signal to the driving circuit of the later stage through the data output end;
the PWM module is used for receiving the display data sent by the communication module and controlling the constant current driving module to perform constant current output according to the display data;
The constant current driving module comprises one or more constant current sources, and each constant current source is used for providing driving constant current for a corresponding LED under the control of the PWM module;
The compensation module comprises compensation units, the number of the compensation units in the compensation module is equal to that of the constant current sources in the constant current driving module, the compensation units are in one-to-one correspondence with the constant current sources to form one or more constant current driving groups, and the compensation units are used for receiving the compensation data sent by the communication module and compensating the constant current starting time of the corresponding constant current sources according to the compensation data so as to make the number of the constant current driving groups in a constant current starting state in each driving circuit group in the serial driving circuit equal.
2. The LED display system of claim 1, wherein the set of drive circuits comprises a first drive circuit, and wherein the constant current drive module of the first drive circuit comprises a plurality of parallel constant current sources.
3. The LED display system of claim 1, wherein,
The driving circuit group comprises a plurality of second driving circuits, and a constant current driving module of each second driving circuit comprises one constant current source;
Or alternatively; the driving circuit group comprises a plurality of third driving circuits, and the constant current driving module of the third driving circuits comprises a plurality of parallel constant current sources.
4. A control method of an LED display system, wherein the LED display system includes a series driving circuit disposed between a positive electrode of a power source terminal and a negative electrode of the power source terminal, the series driving circuit including a plurality of driving circuit groups connected in series, wherein one or more driving circuits are included in the driving circuit groups; each driving circuit is provided with a communication module, a PWM module, a constant current driving module and a compensation module; the communication module is provided with a data input end and a data output end, the data input end of a first driving circuit is connected with the control end, and a plurality of driving circuits are sequentially connected in series with the data input end through the data output end to form a serial data path; the communication module is used for receiving the data signal issued by the serial data channel through the data input end, extracting display data and compensation data corresponding to the driving circuit of the stage from the data signal, and forwarding the data signal to the driving circuit of the later stage through the data output end; the PWM module is used for receiving the display data sent by the communication module and controlling the constant current driving module to perform constant current output according to the display data; the constant current driving module comprises one or more constant current sources, and each constant current source is used for providing driving constant current for a corresponding LED under the control of the PWM module; the compensation module comprises compensation units, the number of the compensation units in the compensation module is equal to that of the constant current sources in the constant current driving module, the compensation units are in one-to-one correspondence with the constant current sources to form one or more constant current driving groups, the compensation units are used for receiving the compensation data sent by the communication module and compensating the constant current opening time of the corresponding constant current sources according to the compensation data, and all the constant current sources included in the driving circuit group form a constant current source group;
the control method of the LED display system comprises the following steps:
Numbering a plurality of constant current sources belonging to the same constant current source group respectively to obtain a numbering result of the constant current sources contained in each constant current source group;
grouping constant current sources with the same number into one group according to the numbering result of all constant current source groups in the LED display system to obtain a plurality of numbered groups;
Obtaining the compensation duration of each constant current source according to the constant current starting duration of a plurality of constant current sources belonging to the same number group;
And sending the compensation duration and the display data of each constant current source to a driving circuit corresponding to each constant current source through the serial data channel, so that the number of constant current driving groups in a constant current on state in each driving circuit group in the serial driving circuits is equal after the driving circuits perform display driving and constant current compensation.
5. The method according to claim 4, wherein the numbering the plurality of constant current sources belonging to the same constant current source group, respectively, to obtain the numbering result of the constant current sources included in each constant current source group comprises:
for any constant current source group i, acquiring the constant current starting time length of each constant current source belonging to the constant current source group i;
Sequencing the constant current sources belonging to the constant current source group i according to the constant current starting time of each constant current source belonging to the constant current source group i, numbering the constant current sources contained in the constant current source group i according to the sequencing result, and obtaining the number of each constant current source contained in the constant current source group i;
Traversing all constant current source groups in the LED display system to obtain the serial numbers of the constant current sources contained in each constant current source group in the LED display system.
6. The method according to claim 5, wherein obtaining the compensation duration of each constant current source according to the constant current on durations of the plurality of constant current sources belonging to the same number group comprises:
for any number group j, acquiring the constant current starting time length of each constant current source in the number group j;
selecting the maximum value from the constant current starting time of each constant current source in the number group j to obtain the maximum value of the constant current starting time;
Obtaining the compensation time length of each constant current source in the number group j according to the maximum value of the constant current start time length and the constant current start time length of each constant current source in the number group j;
and traversing all the numbered groups in the LED display system to obtain the compensation duration of each constant current source.
7. The method according to claim 5, wherein said sequencing the constant current sources belonging to said constant current source group i according to the constant current on-time of each of said constant current sources belonging to said constant current source group i comprises:
And sequencing the plurality of constant current sources belonging to the constant current source group i according to the sequence of the constant current start time from less to more or from more to less, wherein when the constant current source group i comprises the plurality of constant current sources with the same constant current start time, the plurality of constant current sources with the same constant current start time can be sequenced at will.
8. The method according to claim 5, further comprising, after said sorting of the constant current sources belonging to said constant current source group i according to the constant current on-time of each of said constant current sources belonging to said constant current source group i:
When the constant current starting time of the constant current source in the nth order and the constant current source in the mth order in the x constant current source group is smaller than the maximum value of the constant current starting time of the nth order and smaller than the maximum value of the constant current starting time of the mth order, sequencing and exchanging the constant current source in the nth order and the constant current source in the mth order in the x constant current source group.
9. The method according to claim 5, further comprising, after said sorting of the constant current sources belonging to said constant current source group i according to the constant current on-time of each of said constant current sources belonging to said constant current source group i:
If the constant current on time of the p-th constant current source of the y-th constant current source group is the same as the constant current on time of the q-th constant current source of the z-th constant current source group, the constant current on time of the q-th constant current source is the maximum value of the constant current on time of the numbered group where the q-th constant current source is located; and sequencing and interchanging the constant current source in the p-th order and the constant current source in the q-th order of the y-th constant current source group.
10. A computer device, comprising:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of controlling the LED display system of any one of claims 4 to 9.
11. A computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the control method of the LED display system according to any one of claims 4 to 9.
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