CN117953815A - LED display system, control method thereof, computer equipment and storage medium - Google Patents
LED display system, control method thereof, computer equipment and storage medium Download PDFInfo
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Abstract
The invention relates to the technical field of LEDs, in particular to an LED display system, a control method thereof, computer equipment and a storage medium, wherein the LED display system can compensate constant current on-time of each driving circuit in a series driving circuit by additionally arranging a compensation module, for example, the constant current on-time of each driving circuit is compensated to the maximum value of the constant current on-time of each driving circuit, and further the problem that partial pressure among the driving circuits is uneven due to different constant current on-time among the driving circuits, and abnormal turn-off of LEDs is further caused can be solved.
Description
Technical Field
The invention relates to the technical field of LEDs, in particular to an LED display system, a control method thereof, computer equipment and a storage medium.
Background
The pulse width modulation (Pulse width modulation, PWM) technology controls the output current by adjusting the pulse width of the digital signal, thereby adjusting the brightness of the LED lamp bead, having the advantages of accurate control and good display effect, and being widely applied to LED display systems at present. Fig. 1 is a schematic structural diagram of an LED display system in the related art, as shown in fig. 1, the LED display system includes a control end and a plurality of driving circuits, the driving circuits are provided with a power input end Vin and a power output end Vout, and each driving circuit is sequentially connected in series with the power input end Vin through the power output end Vout; meanwhile, the power input end Vin of the first driving circuit is connected with the positive electrode VCC of the power end, the power output end Vout of the last driving circuit is connected with the negative electrode VSS of the power end, and higher voltage is further provided for the serial driving circuits, so that a serial current path is formed between the driving circuits.
As shown in fig. 1, the driving circuit is further provided with a data input end Din and a data output end Dout, and a plurality of driving circuits are sequentially cascaded with the data input end Din through the data output end Dout; meanwhile, the DATA input end Din of the first driving circuit is connected with the control end, a serial DATA path is formed between the control end and the cascade driving circuit, and the control end sends a DATA signal DATA to the cascade driving circuit through the serial DATA path. After the driving circuit receives the DATA signal DATA transmitted by the control end or the previous driving circuit through the DATA input end Din, the display DATA of the driving circuit of the current stage is obtained, and the DATA signal DATA is forwarded to the subsequent driving circuit through the DATA output end Dout.
Fig. 2 is a schematic diagram of a driving circuit in the LED display system shown in fig. 1. As shown in fig. 2, the driving circuit internally includes a communication module, a PWM module, and a constant current driving module. The communication module is respectively connected with the DATA input end Din, the DATA output end Dout and the PWM module, receives a DATA signal DATA transmitted by the control end or the previous-stage driving circuit through the DATA input end Din, acquires corresponding display DATA of the current-stage driving circuit from the DATA signal DATA and transmits the display DATA to the PWM module, and simultaneously transmits the DATA signal DATA to the subsequent-stage driving circuit through the DATA output end Dout; the PWM module is connected with the constant current driving module and can control constant current output of the constant current driving module according to the display data of the current driving circuit obtained by the communication module, for example, the PWM module generates a control signal according to the obtained display data of the current driving circuit and sends the control signal to the constant current driving module so as to control the constant current driving module to perform display driving.
In practical applications of the LED display system, it is found that a problem that the LED is not normally lighted may occur.
Disclosure of Invention
In view of the above, the present invention provides an LED display system, a control method thereof, a computer device and a storage medium for solving the problem that LEDs cannot be normally lighted in the LED display system.
In a first aspect, an embodiment of the present invention provides an LED display system, the LED display system including 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 circuits connected in series; 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 constant current output of the constant current driving module according to the display data; the compensation module is used for receiving the compensation data sent by the communication module and compensating the constant current starting time according to the compensation data so as to make the constant current starting time of each driving circuit in the same serial driving circuit equal.
According to the LED display system provided by the embodiment of the invention, the compensation module is additionally arranged, so that the constant current on time of each driving circuit in the series driving circuit can be compensated, for example, the constant current on time of each driving circuit is compensated to the maximum value of the constant current on time in each driving circuit, and further the problem of abnormal turn-off of LEDs caused by uneven voltage division among the driving circuits due to different constant current on times among the driving circuits can be solved.
In an alternative embodiment, the compensation data includes a constant current on time maximum or compensation time.
That is, the compensation data may be a maximum value of the constant current on time including the cascade LED driving circuit, or may be a compensation time including the present stage driving circuit (obtained from a difference between the maximum value of the constant current on time of the cascade LED driving circuit and the constant current on time of the present stage driving circuit).
In an alternative embodiment, a plurality of series driving circuits are arranged between the positive electrode of the power supply end and the negative electrode of the power supply end, and the plurality of series driving circuits are connected in parallel.
Therefore, for the LED display system with a plurality of driving circuits connected in series, the problem that the LED is turned off abnormally due to uneven voltage division among the driving circuits caused by different constant current on time among the driving circuits can be solved.
In an alternative embodiment, the constant current driving module includes a plurality of first constant current sources, and the first constant current sources provide driving constant current for one first LED; or the constant current driving module comprises a second constant current source which provides driving constant current for a plurality of second LEDs.
Therefore, for the LED display system with one or more constant current sources, the problem of abnormal turn-off of LEDs caused by uneven voltage division among driving circuits due to different constant current turn-on time among driving circuits can be solved.
In a second aspect, an embodiment of the present invention further 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 source terminal and a negative electrode of the power source terminal, and the serial driving circuit includes a plurality of driving circuits connected in series; each driving circuit is provided with a data input end and a data output end, wherein the data input end of a first driving circuit is connected with the control end, 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, and the control method of the LED display system comprises the following steps: acquiring display data of each driving circuit in the same serial driving circuit; obtaining compensation data of each driving circuit according to the display data of each driving circuit in the serial driving circuits; and sending the display data and the compensation data of each driving circuit to the corresponding driving circuit through a serial data channel so that the constant current starting time length is equal after the display driving and the constant current compensation of each driving circuit are carried out.
According to the control method of the LED display system, provided by the embodiment of the invention, the constant current starting time of each driving circuit in the cascade LED driving circuits is compensated in each display period, so that the constant current starting time of each driving circuit is equal, and the problem of abnormal turn-off of LEDs caused by uneven voltage division among the driving circuits due to different constant current starting time among the driving circuits is solved.
In an alternative embodiment, deriving the compensation data for each of the driver circuits from the display data for each of the driver circuits in the series of driver circuits comprises: obtaining constant current starting time of each driving circuit according to display data of each driving circuit in the serial driving circuits; selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time; the maximum value of the constant current on time is taken as the compensation data of each driving circuit.
According to the control method of the LED display system, in each display period, the constant current on time of each driving circuit in the cascade LED driving circuits is compensated, for example, the constant current on time of each driving circuit is compensated to the maximum value of the constant current on time of each driving circuit, and therefore the problem that abnormal turn-off of LEDs is caused due to uneven voltage division among the driving circuits caused by different constant current on times among the driving circuits is solved.
In an alternative embodiment, deriving the compensation data for each of the driver circuits from the display data for each of the driver circuits in the series of driver circuits comprises: obtaining constant current starting time of each driving circuit according to display data of each driving circuit in the serial driving circuits; selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time; subtracting the constant current on time of each driving circuit from the maximum value of the constant current on time to obtain the compensation time of each driving circuit; the compensation time of each driving circuit is taken as the compensation data of each driving circuit.
The compensation data of each driving circuit can be obtained simply and quickly.
In an alternative embodiment, the driving circuit comprises a constant current driving module, wherein the constant current driving module comprises a plurality of first constant current sources, and the first constant current sources provide driving constant current for one first LED; according to the display data of each driving circuit in the serial driving circuits, obtaining the constant current starting time of each driving circuit comprises the following steps: acquiring the lighting time of each first LED for any driving circuit; selecting a maximum value from a plurality of lighting times corresponding to the first LEDs to obtain a maximum lighting time; the maximum lighting time is taken as the constant current on time of the driving circuit.
That is, in the case where driving constant currents are required to be supplied to the plurality of LEDs respectively by the plurality of constant current sources in the constant current driving module of the driving circuit, since different LEDs are driven to display respectively by the plurality of constant current sources, the plurality of LEDs can be simultaneously turned on in each display period, that is, the corresponding constant current sources of the plurality of LEDs can be simultaneously turned on; and then in each display period, the constant current on time of the driving circuit is equal to the maximum value of the on time of a plurality of constant current sources in the driving circuit, namely, the maximum value of the lighting time of a plurality of LEDs of the driving circuit.
In an alternative embodiment, the driving circuit comprises a constant current driving module, wherein the constant current driving module comprises a second constant current source, and the second constant current source provides driving constant current for a plurality of second LEDs; according to the display data of each driving circuit in the serial driving circuits, obtaining the constant current starting time of each driving circuit comprises the following steps: acquiring the lighting time of a second LED for any driving circuit; the lighting time of the second LED is taken as the constant current on time of the driving circuit.
That is, in the case where driving constant currents are supplied to the corresponding LEDs in the display periods of the plurality of LEDs by only the single constant current source in the constant current driving module of the driving circuit, since the single constant current source can drive only one LED to be lit at the same time, the plurality of LEDs in the driving circuit will be lit in turn in the plurality of display periods, respectively, that is, only one LED can be lit for a predetermined time in each display period. Illustratively, the display cycle order of the plurality of LEDs of each driving circuit load is fixedly set. In this case, the constant current on time of the driving circuit in the display period is equal to the on time of the constant current source of the constant current driving module in the display period, that is, the on time of the LED that is correspondingly turned on in the display period.
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 a related art LED display system;
FIG. 2 is a schematic diagram of a driving circuit in the LED display system shown in FIG. 1;
FIG. 3 is a schematic diagram of a driving circuit in an LED display system according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method of controlling an LED display system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a constant current ON time of a cascaded LED driver circuit in a display period according to an embodiment of the present invention;
FIG. 6 is a flow chart of another LED display system control method according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of waveforms of pulse width modulated signals during a display period of a cascaded LED driving circuit according to an embodiment of the present invention;
FIG. 8 is a flow chart of yet another LED display system control method according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of waveforms of pulse width modulated signals during a continuous display period of an exemplary cascaded LED driving circuit according to the present invention;
fig. 10 is a schematic diagram of a hardware structure of a computer device according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, in the LED display system, if all the plurality of driving circuits connected in series are operated normally, it should be ensured that the voltage division level of each driving circuit portion can reach the operating voltage of the driving circuit and the load LED. When all LEDs of a certain driving circuit load in the series current path are in an off state, the equivalent resistance of the driving circuit part is increased, and the driving circuit part presents a high-resistance state, so that the corresponding voltage division of the driving circuit in the series current path is increased; therefore, the whole power consumption of the driving circuit and the corresponding load is increased, and the corresponding partial voltage of other driving circuits which are required to be in a driving and lighting state is reduced, and even the LED lighting function of the driving circuit is not realized sufficiently.
Based on the above, the embodiment of the invention provides an LED display system. 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.
The LED display system provided by the embodiment of the invention comprises a serial driving circuit arranged between a positive electrode of a power supply end and a negative electrode of the power supply end, wherein the serial driving circuit comprises a plurality of driving circuits connected in series; 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; the PWM module is used for receiving the display data sent by the communication module and controlling constant current output of the constant current driving module according to the display data; the compensation module is used for receiving the compensation data sent by the communication module and compensating the constant current starting time according to the compensation data so as to make the constant current starting time of each driving circuit in the same serial driving circuit equal.
Fig. 3 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. 1 and fig. 3, before the display period starts, the communication module receives a DATA signal DATA sent by the control end through the serial DATA channel through the DATA input end Din, acquires display DATA and compensation DATA corresponding to the driving circuit of the stage in the DATA signal DATA, and then forwards the DATA signal DATA to the driving circuit of the subsequent stage through the DATA output end Dout; in addition, the communication module sends the acquired display data to the PWM module, and sends the acquired compensation data to the compensation module; and further, after the display period starts, the PWM module controls the constant current output of the constant current driving module according to the received display data, and meanwhile, the compensation module can provide current compensation according to the received compensation data in a compensation time range before or after the constant current starting time.
This is because, with the above-described LED display system, after one display period starts, each driving circuit in the series driving circuit drives its corresponding part or all of the LEDs to be lit and maintains a certain lighting period, respectively, the lighting period of the LEDs being determined by the display data received by the driving circuit; when all the LEDs driven to be lighted by a certain driving circuit are displayed and the LEDs still exist in the continuous lighting state, namely, the constant current starting time of the driving circuit is ended and the constant current starting time of other driving circuits is not ended, the driving circuit presents a high resistance state in a series current path, the corresponding voltage division is increased, and then the voltage division of other driving circuits in the constant current starting state in the series LED driving circuit is reduced, so that the LED display driving is difficult to realize.
Therefore, in the LED display system provided by the embodiment of the present invention, by adding the compensation module, the constant current on time of each driving circuit in the serial driving circuit can be compensated, for example, the constant current on time of each driving circuit is compensated to the maximum value of the constant current on time in each driving circuit, so that the problem of abnormal turn-off of the LED caused by uneven voltage division among the driving circuits due to different constant current on times among the driving circuits is further solved.
In an alternative embodiment, the compensation data is a constant current on time maximum or compensation time. That is, the compensation data may be a maximum value of the constant current on time including the cascade LED driving circuit, or may be a compensation time including the current stage driving circuit (obtained according to a difference between the maximum value of the constant current on time of the cascade LED driving circuit and the constant current on time of the current stage driving circuit), and the specific form of the compensation data is not limited herein.
On the basis, the compensation module can also receive constant current on time data of the driving circuit of the current stage through a communication module or other modes, or monitor and identify the constant current on time of the driving circuit of the current stage, so as to provide current compensation in a compensation time range before or after the constant current on time.
In an alternative embodiment, a plurality of series driving circuits are arranged between the positive electrode of the power supply end and the negative electrode of the power supply end, and the plurality of series driving circuits are connected in parallel. For example, a plurality of series driving circuits may be provided between the power supply terminal positive electrode VCC and the power supply terminal negative electrode VSS of fig. 1, wherein the plurality of series driving circuits are connected in parallel. In addition, it should be noted that, the setting of the data port and the transmission direction of the data signal in the LED display system shown in fig. 1 are only examples, although the data signal in fig. 1 is transmitted from top to bottom, actually, the data signal may be transmitted from bottom to top by adjusting the position of the data port.
PWM is a common method for controlling and displaying on-time, which is to control the lighting time of LEDs in a display period to realize a predetermined gray scale, and the lighting time of each LED in the same display period is different because the gray scale to be realized by each LED lamp is different. Accordingly, the constant current on time of each driving circuit is determined by the maximum value of the lighting time in the LEDs whose driving is lighted in the current display period. In practical application, the constant current driving module of the driving circuit mainly provides driving constant current for the LEDs through the constant current source to light the corresponding LEDs, and certain difference exists in setting of the constant current source for different application scenes.
In an alternative embodiment, the constant current driving module includes a plurality of first constant current sources, and the first constant current sources provide driving constant current for the first LEDs. That is, the driving circuit is further provided with a plurality of driving output terminals OUT. Taking common anode driving as an example, a power input end Vin of a driving circuit supplies power to anode ends of LEDs, a plurality of first constant current sources of a constant current driving module are connected with cathode ends of the LEDs through a plurality of driving output ends OUT, and meanwhile, the constant current driving module is also connected with a power output end Vout so as to form a current path in the range of the current driving circuit and the load LEDs. And the constant current driving module can perform constant current driving on the LEDs through the driving output ends OUT under the control of the control signals.
In an alternative embodiment, the constant current driving module includes a second constant current source, and the second constant current source provides a driving constant current for the second LED.
According to an embodiment of the present invention, there is provided a control method embodiment of an LED display system, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in an order different from that herein.
The embodiment of the invention provides a control method of an LED display system, wherein the LED display system comprises a serial driving circuit arranged between a positive electrode of a power end and a negative electrode of the power end, and the serial driving circuit comprises a plurality of driving circuits connected in series; each driving circuit is provided with a data input end and a data output end, wherein 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 control method of the LED display system according to the embodiment of the present invention may be used at a control end of the LED display system, and fig. 4 is a flowchart of the control method of the LED display system according to the embodiment of the present invention, as shown in fig. 4, where the flowchart includes the following steps:
step S401: display data of each of the same series driving circuits is acquired.
Step S402: and obtaining compensation data of each driving circuit according to the display data of each driving circuit in the serial driving circuits.
In an alternative embodiment, deriving the compensation data for each of the driver circuits from the display data for each of the driver circuits in the series of driver circuits comprises: obtaining constant current starting time of each driving circuit according to display data of each driving circuit in the serial driving circuits; selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time; the maximum value of the constant current on time is taken as the compensation data of each driving circuit.
In an alternative embodiment, deriving the compensation data for each of the driver circuits from the display data for each of the driver circuits in the series of driver circuits comprises: obtaining constant current starting time of each driving circuit according to display data of each driving circuit in the serial driving circuits; selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time; subtracting the constant current on time of each driving circuit from the maximum value of the constant current on time to obtain the compensation time of each driving circuit; the compensation time of each driving circuit is taken as the compensation data of each driving circuit.
Step S403: and sending the display data and the compensation data of each driving circuit to the corresponding driving circuit through a serial data channel so that the constant current starting time length is equal after the display driving and the constant current compensation of each driving circuit are carried out.
To make the control method of the LED display system of the embodiment of the present invention more clear, a specific example is given, and fig. 5 is a schematic diagram of constant current on time of the cascade LED driving circuit of the embodiment of the present invention in a certain display period. It should be understood that the number of driving circuits in the cascade LED driving circuit in the embodiment of the present invention is not limited to the case illustrated in fig. 5.
As shown in fig. 5, before the display period starts, constant current on-times TM1, TM2, TM3, etc. of the driving circuit 1, the driving circuit 2, the driving circuit 3, etc. in the display period shown in fig. 5 are obtained from the display data of the driving circuit 1, the driving circuit 2, the driving circuit 3, etc. respectively, and then the constant current on-times TM of the driving circuits are compared to obtain the maximum value of the constant current on-times; as shown in fig. 5, the constant current on time TM3 of the driving circuit 3 in the cascade LED driving circuit is maximum, and thus TM3 can be regarded as the maximum value of the constant current on time of the cascade LED driving circuit in the display period. The compensation time TN of each driving circuit in the display period can be obtained by combining the maximum value of the constant current on time, as shown in fig. 5, the compensation time of the driving circuit 1 is TN1, the compensation time of the driving circuit 2 is TN2, and the driving circuit 3 does not need to perform time compensation.
In particular, if the constant current on time of all the driving circuits in the cascade LED driving circuit is 0 in a certain display period, compensation is not required.
That is, in the control method of the LED display system provided by the embodiment of the present invention, in each display period, the constant current on time of each driving circuit in the cascade LED driving circuit is compensated, for example, the constant current on time of each driving circuit is compensated to the maximum value of the constant current on time in each driving circuit, so that the problem of abnormal turn-off of the LED caused by uneven voltage division among driving circuits due to different constant current on times among driving circuits is eliminated.
The control end is responsible for controlling the display driving of the cascade LED driving circuits, so that gray data of the LEDs corresponding to all driving circuits in a display period, namely the lighting time of the LEDs in the display period, can be known, and therefore constant current starting time of all driving circuits in the cascade LED driving circuits in the display period can be obtained through the control end according to the display data of the cascade LED driving circuits in advance, and the maximum value of the constant current starting time in the cascade LED driving circuits in the display period is obtained, so that compensation data corresponding to all driving circuits are obtained according to the maximum value of the constant current starting time and the constant current starting time of each driving circuit; and then the display period is sent to each driving circuit through a serial data path before the display period starts, so that the driving circuit carries out corresponding compensation according to the compensation data.
The embodiment of the invention provides a control method of an LED display system, wherein the LED display system comprises a serial driving circuit arranged between a positive electrode of a power end and a negative electrode of the power end, and the serial driving circuit comprises a plurality of driving circuits connected in series; each driving circuit is provided with a data input end and a data output end, wherein 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 driving circuit comprises a constant current driving module, wherein the constant current driving module comprises a plurality of first constant current sources, and the first constant current sources provide driving constant current for the first LEDs. That is, in the constant current driving module of the driving circuit, driving constant current needs to be supplied to the plurality of LEDs by the plurality of constant current sources, respectively.
The control method of the LED display system provided by the embodiment of the invention can be used for the control end of the LED display system. Fig. 6 is a flowchart of another control method of an LED display system according to an embodiment of the present invention, as shown in fig. 6, the flowchart including the steps of:
Step S601: display data of each of the same series driving circuits is acquired.
Step S602: and obtaining the constant current starting time of each driving circuit according to the display data of each driving circuit in the serial driving circuits.
In an alternative embodiment, obtaining the constant current on time of each driving circuit based on the display data of each driving circuit in the series driving circuits includes:
step S6021: for any one of the driving circuits, the lighting time of each first LED is acquired.
Step S6022: and selecting the maximum value from a plurality of lighting times corresponding to the first LEDs to obtain the maximum lighting time.
Step S6023: the maximum lighting time is taken as the constant current on time of the driving circuit.
That is, in the case where driving constant currents are required to be supplied to the plurality of LEDs respectively by the plurality of constant current sources in the constant current driving module of the driving circuit, since different LEDs are driven to display respectively by the plurality of constant current sources, the plurality of LEDs can be simultaneously turned on in each display period, that is, the corresponding constant current sources of the plurality of LEDs can be simultaneously turned on; and then in each display period, the constant current on time of the driving circuit is equal to the maximum value of the on time of a plurality of constant current sources in the driving circuit, namely, the maximum value of the lighting time of a plurality of LEDs of the driving circuit.
Fig. 7 is a schematic waveform diagram of pulse width modulation signals of the cascade LED driving circuit in a certain display period according to an embodiment of the present invention. It should be understood that the number of driving circuits and the number of LEDs loaded by the driving circuits in the cascaded LED driving circuit in the embodiment of the present invention is not limited to the case illustrated in fig. 7.
Specifically, before the display period starts, the lighting time of each LED corresponding to each driving circuit is obtained according to the display data of each driving circuit, and then the maximum value of the lighting time of each LED corresponding to each driving circuit load is used as the constant current on time TM of each driving circuit in the display period. For example, as shown in fig. 7, the lighting time of the LED1-1, LED1-2, LED1-3, etc. of the load is acquired for the driving circuit 1 in the display period; among the LEDs 1-1, LED1-2, LED1-3, etc. loaded by the driving circuit 1, the lighting time of the LED1-2 in the display period is the largest, that is, the lighting time of the LED1-2 is taken as the constant current on time TM1 of the driving circuit 1 in the display period. The acquisition of the constant current on time of the other driving circuits is similar to that of the driving circuit 1, and will not be described here again.
Step S603: and selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time.
That is, the constant current on time TM of each driving circuit in the same display period is compared to obtain the maximum value of the constant current on time of the cascaded LED driving circuits in the display period. As shown in fig. 7, comparing the constant current on-times TM1, TM2, TM3, etc. of the driving circuit 1, the driving circuit 2, the driving circuit 3, etc., it is known that TM1/TM3 is maximum, TM1/TM3 is taken as the maximum value of the constant current on-times of the cascade LED driving circuits, and the difference between the constant current on-times of the driving circuits and the maximum value of the constant current on-times is calculated as the compensation time TN of the driving circuits in the display period. As shown in fig. 7, the compensation time TN2 of the driving circuit 2 in the display period can be obtained.
Step S604: and subtracting the constant current on time of each driving circuit from the maximum value of the constant current on time to obtain the compensation time of each driving circuit.
Step S605: the compensation time of each driving circuit is taken as the compensation data of each driving circuit.
Step S606: and sending the display data and the compensation data of each driving circuit to the corresponding driving circuit through a serial data channel so that the constant current starting time length is equal after the display driving and the constant current compensation of each driving circuit are carried out.
That is, in the embodiment of the present invention, the acquisition of the constant current on time for the driving circuit may be: and for all the driving circuits in the cascade LED driving circuits, acquiring the lighting time of a plurality of LEDs corresponding to each driving circuit in a display period, and taking the maximum value of the lighting time of the LEDs corresponding to the driving circuits as the constant current starting time of each driving circuit. And obtaining the maximum value of the constant current on time in the cascaded LED driving circuits according to the constant current on time of all driving circuits in the cascaded LED driving circuits, so as to obtain the compensation time of each driving circuit according to the maximum value of the constant current on time and the constant current on time of each driving circuit, and sending the compensation time to the corresponding driving circuit as compensation data before the display period starts, so that the driving circuits perform corresponding compensation.
The embodiment of the invention provides a control method of an LED display system, wherein the LED display system comprises a serial driving circuit arranged between a positive electrode of a power end and a negative electrode of the power end, and the serial driving circuit comprises a plurality of driving circuits connected in series; each driving circuit is provided with a data input end and a data output end, wherein 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 driving circuit comprises a constant current driving module, wherein the constant current driving module comprises a second constant current source, and the second constant current source provides driving constant current for the second LED. That is, in the constant current driving module of the driving circuit, driving constant current is respectively supplied to the corresponding LEDs only through a single constant current source in the display period of the plurality of LEDs.
The control method of the LED display system provided by the embodiment of the invention can be used for the control end of the LED display system. Fig. 8 is a flowchart of a control method of a further LED display system according to an embodiment of the present invention, as shown in fig. 8, the flowchart including the steps of:
Step S801: display data of each of the same series driving circuits is acquired.
Step S802: and obtaining the constant current starting time of each driving circuit according to the display data of each driving circuit in the serial driving circuits.
In an alternative embodiment, obtaining the constant current on time of each driving circuit based on the display data of each driving circuit in the series driving circuits includes:
Step S8021: and aiming at any driving circuit, acquiring the lighting time of a second LED which is preset to be lighted in the display period.
Step S8022: the lighting time of the second LED is taken as the constant current on time of the driving circuit.
That is, in the case where driving constant currents are supplied to the corresponding LEDs in the display periods of the plurality of LEDs by only the single constant current source in the constant current driving module of the driving circuit, since the single constant current source can drive only one LED to be lit at the same time, the plurality of LEDs in the driving circuit will be lit in turn in the plurality of display periods, respectively, that is, only one LED can be lit for a predetermined time in each display period. Illustratively, the display cycle order of the plurality of LEDs of each driving circuit load is fixedly set. In this case, the constant current on time of the driving circuit in the display period is equal to the on time of the constant current source of the constant current driving module in the display period, that is, the on time of the LED that is correspondingly turned on in the display period.
Fig. 9 is a schematic waveform diagram of a pulse width modulation signal of a cascaded LED driving circuit according to an embodiment of the present invention during a certain continuous display period. It should be understood that the number of driving circuits in the cascaded LED driving circuit and the number of LEDs that the driving circuit loads in this scheme are not limited to the case illustrated in fig. 9.
Specifically, before each display period starts, the lighting time of the LED that is correspondingly lighted by each driving circuit in the display period may be obtained according to the display data of each driving circuit, and the lighting time may be used as the constant current on time TM of the driving circuit in the display period. For example, in the driving circuit 1 shown in fig. 9, the constant current source sequentially drives and lights the LEDs 1-1, 1-2, 1-3, and the like in successive display periods. For the driving circuit 1, in the first display period shown in fig. 9, the lighting time of the LED1-1 corresponding to the lighting of the driving circuit 1 is obtained, and the lighting time of the LED1-1 is taken as the constant current on time TM1 of the driving circuit 1 in the first display period. The acquisition of the constant current on time of the driving circuit 2 and the driving circuit 3 is similar to that of the driving circuit 1, the lighting time of the LEDs 2-1 and 3-1 in the first display period is respectively acquired, and the lighting time of the LEDs 1-2 is used as the constant current on time TM2 of the driving circuit 2 in the first display period; the on time of the LEDs 1-3 is taken as the constant current on time TM3 of the driving circuit 3 in the first display period.
Step S803: and selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time.
As shown in fig. 9, the maximum value of the constant current on time of the cascade LED driving circuit in the same display period can be obtained by comparing the constant current on time TM (including TM1, TM2, and TM 3) of each driving circuit in the same display period. For example, for the first display period, comparing the constant current on-times TM1, TM2, TM3, etc. of the driving circuit 1, the driving circuit 2, the driving circuit 3, and so on, it is known that TM2 is the largest, so TM2 is taken as the maximum value of the constant current on-times of the cascade LED driving circuit in the first display period; further, a difference between the constant current on time and the maximum value of the constant current on time of each driving circuit is calculated, and the calculated difference is used as the compensation time TN of each driving circuit in the first display period. For example, the compensation time of the driving circuit 1 is TN1 and the compensation time of the driving circuit 3 is TN3 in the first display period.
Step S804: the maximum value of the constant current on time is taken as the compensation data of each driving circuit.
Step S805: and sending the display data and the compensation data of each driving circuit to the corresponding driving circuit through a serial data channel so that the constant current starting time length is equal after the display driving and the constant current compensation of each driving circuit are carried out.
That is, in the embodiment of the present invention, the acquisition of the constant current on time for the driving circuit may be: and for all the driving circuits in the cascade LED driving circuits, acquiring the lighting time of the LED correspondingly displayed by each driving circuit in the display period, and taking the lighting time of the LED as the constant current starting time of the driving circuit in the display period. And obtaining the maximum value of the constant current on time in the cascaded LED driving circuits according to the constant current on time of all driving circuits in the cascaded LED driving circuits, so as to obtain the compensation time of each driving circuit according to the maximum value of the constant current on time and the constant current on time of each driving circuit, and sending the compensation time to the corresponding driving circuit as compensation data before the display period starts, so that the driving circuits perform corresponding compensation.
It should be noted that, in the embodiment of the present invention, compensation data corresponding to each driving circuit is obtained, so that the driving circuit performs constant current compensation for a corresponding time according to the compensation data, and the compensation process may be: and in the compensation time range before or after the constant current starting time, controlling the corresponding constant current of the driving circuit to be started, and ensuring that the LEDs are continuously in a non-lighted state, so that the normal display process of the LED display system is not influenced while the partial pressure adjustment is realized. The compensation method involved in the compensation process is various, and the scheme is not limited to this.
In the waveform schematic diagram according to the embodiment of the present invention, the case where each driving circuit simultaneously starts the constant current driving, that is, the constant current start time period has the same starting point is exemplified, and it should be understood that the case where each driving circuit simultaneously ends the constant current driving, that is, the constant current start time period has the same ending point is also applicable, and only the compensation needs to be performed before the constant current start time according to the compensation time.
In addition, the display period in the embodiment of the present invention may refer to one field, one frame period, one subframe, or other defined unit periods, which is not limited in this scheme.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a computer device according to an alternative embodiment of the present invention, as shown in fig. 10, 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. 10.
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, characterized in that the LED display system 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 circuits connected in series; 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 constant current output of the constant current driving module according to the display data;
the compensation module is used for receiving the compensation data sent by the communication module and compensating the constant current starting time according to the compensation data so as to make the constant current starting time of each driving circuit in the same serial driving circuit equal.
2. The LED display system of claim 1, wherein the compensation data comprises a constant current on time maximum or a compensation time.
3. The LED display system of claim 1, wherein a plurality of series drive circuits are provided between the power supply terminal positive electrode and the power supply terminal negative electrode, the plurality of series drive circuits being connected in parallel.
4. The LED display system of claim 1, wherein the constant current driving module includes a plurality of first constant current sources, the first constant current sources providing driving constant current for one first LED; or the constant current driving module comprises a second constant current source, and the second constant current source provides driving constant current for a plurality of second LEDs.
5. 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 circuits connected in series; each driving circuit is provided with a data input end and a data output end, wherein the data input end of a first driving circuit is connected with a control end, a plurality of driving circuits are sequentially connected in series through the data output ends and the data input ends to form a serial data path, and the control method of the LED display system comprises the following steps:
acquiring display data of each driving circuit in the same serial driving circuit;
obtaining compensation data of each driving circuit according to the display data of each driving circuit in the serial driving circuits;
And sending the display data and the compensation data of each driving circuit to the corresponding driving circuit through the serial data path so that the constant current starting time length is equal after each driving circuit performs display driving and constant current compensation.
6. The method of claim 5, wherein deriving compensation data for each of the driver circuits based on display data for each of the driver circuits in the series of driver circuits comprises:
obtaining constant current starting time of each driving circuit according to display data of each driving circuit in the serial driving circuits;
selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time;
and taking the maximum value of the constant current on time as compensation data of each driving circuit.
7. The method of claim 5, wherein deriving compensation data for each of the driver circuits based on display data for each of the driver circuits in the series of driver circuits comprises:
obtaining constant current starting time of each driving circuit according to display data of each driving circuit in the serial driving circuits;
selecting the maximum value from the constant current starting time of each driving circuit to obtain the maximum value of the constant current starting time;
Subtracting the constant current starting time of each driving circuit from the maximum value of the constant current starting time to obtain the compensation time of each driving circuit;
And taking the compensation time of each driving circuit as the compensation data of each driving circuit.
8. The method according to claim 6 or 7, wherein the driving circuit comprises a constant current driving module including a plurality of first constant current sources, the first constant current sources providing driving constant current for one first LED; the obtaining the constant current on time of each driving circuit according to the display data of each driving circuit in the serial driving circuits comprises the following steps:
acquiring the lighting time of each first LED for any one of the driving circuits;
selecting a maximum value from a plurality of lighting time corresponding to the first LEDs to obtain a maximum lighting time;
and taking the maximum lighting time as the constant current starting time of the driving circuit.
9. The method according to claim 6 or 7, wherein the driving circuit comprises a constant current driving module including a second constant current source providing driving constant current for the plurality of second LEDs; the obtaining the constant current on time of each driving circuit according to the display data of each driving circuit in the serial driving circuits comprises the following steps:
Acquiring the lighting time of the second LED which is preset to be lighted in a display period aiming at any driving circuit;
and taking the lighting time of the second LED as the constant current on time of the driving circuit.
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 5 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 5 to 9.
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