Driving circuit and driving method of light emitting diode

Abstract

The invention relates to a driving circuit and a driving method of light-emitting diodes. The driving circuit of the light-emitting diodes comprises a driving chip and a plurality of light-emitting diodes connected with the driving chip, the driving chip comprises a plurality of driving ports, and each driving port is connected with anodes of a plurality of light emitting diodes and cathodes of a plurality of light emitting diodes; each driving port drives the connected light emitting diode through a pulse driving signal; the anode and the cathode of the same light emitting diode are respectively connected with different driving ports; in the plurality of light-emitting diodes, if the anodes of any two light-emitting diodes are connected with the same driving port, the cathodes of the two light-emitting diodes are connected with different driving ports; and if the cathodes of any two light emitting diodes are connected with the same driving port, the anodes of the two light emitting diodes are connected with different driving ports. By adopting the driving circuit of the light-emitting diode, not only can the driving ports be saved, but also the current-limiting resistors can be saved, so that the layout space of the driving circuit is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of circuits and their control, and particularly to a driving circuit and a driving method for light-emitting diodes. Background Art

[0002] In the related art, a dynamic scanning driving method is mostly adopted to drive light-emitting diodes; in the driving circuit of the dynamic scanning driving method in the related art, the driving ports of the driving chip are divided into a common end and a segment code digital end. If the number of common ends is set to N and the number of segment code digital ends is set to M, then a driving chip with N + M driving ports and N current-limiting resistors are required. Based on the above driving circuit, at most N × M light-emitting diodes can be driven.

[0003] Therefore, for the driving circuit based on the dynamic scanning driving method in the related art, if a relatively large number of light-emitting diodes need to be driven, on the one hand, a large number of driving ports need to be occupied, and on the other hand, a large number of current-limiting resistors need to be arranged in the driving circuit. Based on the above two points, it is easy to cause a relatively large layout space for the driving circuit of the light-emitting diodes. Summary of the Invention

[0004] Based on this, in view of the above technical problem that when a relatively large number of light-emitting diodes need to be driven, a large number of driving ports need to be occupied and a large number of resistors need to be added, resulting in a relatively large layout space for the driving circuit, a driving circuit and a driving method for light-emitting diodes are provided, which can save both driving ports and current-limiting resistors, thereby reducing the layout space of the driving circuit.

[0005] The first technical problem to be solved by the present invention is to provide a driving circuit for light-emitting diodes, which can effectively save driving ports and current-limiting resistors, thereby reducing the layout space of the driving circuit.

[0006] The second technical problem to be solved by the present invention is to provide a driving method for a driving circuit of light-emitting diodes, which can effectively save driving ports and current-limiting resistors, thereby reducing the layout space of the driving circuit.

[0007] The above first technical problem is solved by the following technical solutions:

[0008] A driving circuit for light-emitting diodes, the driving circuit for light-emitting diodes includes a driving chip and a plurality of light-emitting diodes connected to the driving chip;

[0009] The driving chip includes a plurality of driving ports, and each driving port is connected to the anodes and cathodes of a plurality of light-emitting diodes; each driving port drives the connected light-emitting diodes through a pulse driving signal; the anode and cathode of the same light-emitting diode are respectively connected to different driving ports;

[0010] Among the multiple light-emitting diodes, when the anodes of two light-emitting diodes are connected to the same driving port, the cathodes of the two light-emitting diodes are respectively connected to different driving ports; when the cathodes of two light-emitting diodes are connected to the same driving port, the anodes of the two light-emitting diodes are respectively connected to different driving ports.

[0011] The driving circuit of the light-emitting diode according to the present invention has the beneficial effects compared with the background technology: by connecting each driving port to the anodes of multiple light-emitting diodes and also to the cathodes of multiple light-emitting diodes, the common end and the segment code digital segments can be multiplexed on the same driving port, thus saving driving ports; the driving port drives the light-emitting diode through a pulse driving signal, which can reasonably control the current flowing through the light-emitting diode, so that the light-emitting diode can be protected even without a current-limiting resistor, and further saves the current-limiting resistor; therefore, the layout space of the driving circuit is reduced.

[0012] In one embodiment, the number of the multiple driving ports is N, and the number of the multiple light-emitting diodes connected to the driving chip is N×(N−1).

[0013] Through N driving ports, N×(N−1) light-emitting diodes can be connected, so as to realize the driving of N×(N−1) light-emitting diodes. Furthermore, without increasing the number of driving ports, as many light-emitting diodes as possible can be driven, thus saving driving ports.

[0014] In one embodiment, each driving port is connected to the anodes of N−1 light-emitting diodes and the cathodes of N−1 light-emitting diodes.

[0015] In one embodiment, the N×(N−1) light-emitting diodes are arranged in an array of N−1 rows and N columns.

[0016] By arranging the N×(N−1) light-emitting diodes in an orderly manner into an array of N−1 rows and N columns, a reasonable layout of multiple light-emitting diodes can be realized, thereby reducing the layout space of the driving circuit.

[0017] In one embodiment, the N×(N−1) light-emitting diodes are divided into N groups of first light-emitting diodes by rows;

[0018] The N×(N−1) light-emitting diodes are divided into N groups of second light-emitting diodes by columns;

[0019] Each driving port is connected to the anodes of all the light-emitting diodes in a group of first light-emitting diodes and the cathodes of all the light-emitting diodes in a group of second light-emitting diodes;

[0020] The column numbers of the respective first light-emitting diodes connected to each of the driving ports in the array are different from the column numbers of the respective second light-emitting diodes connected to the driving ports in the array.

[0021] By setting the column numbers of the respective first light-emitting diodes connected to each driving port in the array and the column numbers of the respective second light-emitting diodes connected to the driving ports in the array, a reasonable layout of the connection lines between the driving ports and the light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0022] In one embodiment, the nth group of the N groups of first light-emitting diodes includes:

[0023] The second to the Nth light-emitting diodes in the first row of the array, where n = 1;

[0024] The first n - 1 light-emitting diodes in the (n - 1)th row and the last N - n light-emitting diodes in the nth row of the array, where 1 < n ≤ N - 1;

[0025] The first to the N - 1th light-emitting diodes in the (N - 1)th row of the array, where n = N;

[0026] The nth group of the N groups of second light-emitting diodes includes the light-emitting diodes in the nth column of the array, where 1 ≤ n ≤ N;

[0027] Wherein, the anodes of the first light-emitting diodes in the same group are connected to the same driving port, and the cathodes of the second light-emitting diodes in the same group are connected to the same driving port.

[0028] By grouping the light-emitting diodes according to their positions in the array and then connecting the light-emitting diodes in the same group to the same driving port, a reasonable layout of the connection lines between the driving ports and the light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0029] In one embodiment, the N driving ports are arranged in sequence from top to bottom;

[0030] The anode of the nth group of the first light-emitting diodes is connected to the nth driving port among the N driving ports;

[0031] The cathode of the nth group of the second light-emitting diodes is connected to the nth driving port among the N driving ports.

[0032] By arranging the N driving ports in sequence from top to bottom and connecting each group of light-emitting diodes based on the arrangement of the N driving ports, a reasonable layout of the connection lines between the driving ports and the light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0033] In one embodiment, the pulse width of the pulse driving signal is positively correlated with the load capacity of the light-emitting diode.

[0034] Reasonably setting the pulse width of the pulse driving signal based on the load capacity of the light-emitting diode can reasonably control the current flowing through the light-emitting diode, so as to protect the light-emitting diode even without a current-limiting resistor, thereby saving the current-limiting resistor.

[0035] The above second technical problem is solved by the following technical solution:

[0036] A driving method for a driving circuit of a light-emitting diode as described in any one of the above embodiments, the method comprising:

[0037] At preset intervals, sequentially set the pulse driving signals output by each driving port of the driving chip of the light-emitting diode to the low level state, and scan each of the remaining driving ports corresponding to each driving port;

[0038] When there is a lighting requirement for the light-emitting diodes connected to each of the remaining driving ports, set the driving pulse signals output by the remaining driving ports to the high level state; the light-emitting diodes to be driven are the light-emitting diodes whose cathodes of the light-emitting diodes to be driven are connected to each driving port and whose anodes of the light-emitting diodes to be driven are connected to the remaining driving ports.

[0039] The beneficial effects of the driving method of the driving circuit of the light-emitting diode according to the present invention compared with the background art: through a driving circuit in which each driving port is connected to the anodes of multiple light-emitting diodes and is also connected to the cathodes of multiple light-emitting diodes, the common end and the segment code digital segment can be multiplexed on the same driving port, thereby saving driving ports; by driving the light-emitting diodes with the pulse driving signals output by the driving ports, the current flowing through the light-emitting diodes can be reasonably controlled, so as to protect the light-emitting diodes even without a current-limiting resistor, thereby saving the current-limiting resistor; therefore, the layout space of the driving circuit is reduced.

[0040] In an exemplary embodiment, before sequentially setting the pulse driving signals output by each driving port of the driving chip of the light-emitting diode to the low level state at preset intervals, it further includes: setting the pulse driving signals output by each driving port of the driving chip to the floating input state.

[0041] The method further includes: when there is no lighting requirement for the light-emitting diodes connected to each of the remaining driving ports, keeping the driving pulse signals output by the remaining driving ports in the floating input state. Description of the Drawings

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the related art, the following will briefly introduce the drawings required for the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 Schematic diagram of a driving circuit for a light-emitting diode in one embodiment;

[0044] Figure 2 Schematic diagram of a driving circuit for a light-emitting diode in another embodiment;

[0045] Figure 3 Schematic diagram of a driving circuit for a light-emitting diode in yet another embodiment;

[0046] Figure 4 Schematic diagram of a driving circuit for a light-emitting diode in still another embodiment;

[0047] Figure 5 Schematic flowchart of a driving method for a driving circuit of a light-emitting diode in one embodiment;

[0048] Figure 6 Structural block diagram of a driving device for a driving circuit of a light-emitting diode in one embodiment. Detailed implementation manners

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further details the present invention in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] In the description of the present invention, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0051] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, if the term "a plurality" appears, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the present invention, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0054] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present invention are only for the purpose of illustration and do not represent the only implementation manner.

[0055] Referring to Figure 1 , Figure 1 , which shows a schematic diagram of a driving circuit for a light-emitting diode in an embodiment of the present invention. The driving circuit for a light-emitting diode provided by an embodiment of the present invention includes a driving chip and a plurality of light-emitting diodes connected to the driving chip.

[0056] The driving chip includes multiple driving ports, and each driving port is connected to the anodes and cathodes of multiple light-emitting diodes; each driving port drives the connected light-emitting diodes through a pulse driving signal; the anode and cathode of the same light-emitting diode are respectively connected to different driving ports.

[0057] Among them, among the multiple light-emitting diodes, when the anodes of two light-emitting diodes are connected to the same driving port, the cathodes of the two light-emitting diodes are respectively connected to different driving ports; when the cathodes of two light-emitting diodes are connected to the same driving port, the anodes of the two light-emitting diodes are respectively connected to different driving ports.

[0058] Among them, the driving port refers to the IO (Input / Output) port of the driving chip; the light-emitting diode refers to the LED (Light Emitting Diode).

[0059] Currently, the dynamic scanning driving method is mostly used to drive the light-emitting diodes. In the driving circuit of the dynamic scanning driving, the IO ports are divided into a common end (i.e., the COM end) and a segment code digital end (SEG end); the COM end is usually used to connect the anodes of the LEDs, and the SEG is usually used to connect the cathodes of the LEDs. If the number of COM ends is set to N and the number of SEG ends is set to M, then a driving chip with N + M IO ports and N current-limiting resistors are required.

[0060] To make the technical solution of the present invention clearer, the working principle of the driving circuit of the light-emitting diodes provided by the present invention is described as follows: at preset interval times, the pulse driving signals output by each driving port of the driving chip of the light-emitting diodes are sequentially set to the low-level state. In this way, the driving port corresponding to the output set to the low-level state will be set as the common end, and each of the remaining driving ports will be set as the segment code digital end. Then, each of the remaining driving ports is scanned, and when there is a lighting requirement for the light-emitting diodes connected to each of the remaining driving ports, the driving pulse signals output by the remaining driving ports are set to the high-level state, where the light-emitting diodes to be driven are the light-emitting diodes whose cathodes are connected to each driving port and whose anodes are connected to the remaining driving ports.

[0061] In this way, by setting the driving port connected to the cathode of the light-emitting diode with a lighting requirement to the low-level state and setting the driving port connected to the anode of the light-emitting diode with a lighting requirement to the high-level state, the lighting of the light-emitting diodes can be achieved.

[0062] On the one hand, in this embodiment, each driving port is connected to the anodes of multiple light-emitting diodes and the cathodes of multiple light-emitting diodes. That is, each driving port serves as both a common terminal connected to the anodes of multiple light-emitting diodes and a segment code digital segment terminal connected to the cathodes of multiple light-emitting diodes. Therefore, the multiplexing of the common terminal and the segment code digital terminal on the same driving port is achieved. Compared with the driving circuit of the traditional dynamic scanning driving method, this embodiment can drive the same number of light-emitting diodes with fewer driving ports, saving driving ports and reducing the layout space of the driving circuit.

[0063] On the other hand, in this embodiment, since the pulse signal is a discrete signal with obvious intervals between waveforms, such as a rectangular wave, and according to the characteristics of the light-emitting diode, its pulse current can reach 100 mA. Therefore, when the driving port uses a driving pulse signal to drive the light-emitting diode, the current flowing through the light-emitting diode can be reasonably controlled without connecting a current-limiting resistor. Compared with the driving circuit of the traditional dynamic scanning driving method, this embodiment can avoid the situation that the current on the light-emitting diode is too large and causes damage to the light-emitting diode without a current-limiting resistor, saving the current-limiting resistor and reducing the layout space of the driving circuit.

[0064] In an exemplary embodiment, the number of multiple driving ports is N, and the number of multiple light-emitting diodes connected to the driving chip is N×(N−1).

[0065] For example, if the number of driving ports is 8, then the number of light-emitting diodes connected to the driving chip is 8×7 = 56. In the driving circuit of the traditional dynamic scanning driving method, if there are 4 common terminals and 4 segment code digital terminals, only 4×4 = 16 light-emitting diodes can be connected.

[0066] In this embodiment, through N driving ports, N×(N−1) light-emitting diodes can be connected, thereby realizing the driving of N×(N−1) light-emitting diodes. Compared with the driving circuit in the traditional dynamic scanning driving method, where N common terminals and M segment code digital terminals can only drive N×M light-emitting diodes, this embodiment can drive as many light-emitting diodes as possible without increasing the number of driving ports. Therefore, driving ports are saved.

[0067] In an exemplary embodiment, each driving port is connected to the anodes of N−1 light-emitting diodes and the cathodes of N−1 light-emitting diodes.

[0068] For example, if the number of driving ports is 8, then each driving port is connected to the anodes of 7 light-emitting diodes and the cathodes of 7 driving light-emitting diodes.

[0069] In this embodiment, when each driving port serves as a common terminal, it can control N - 1 light-emitting diodes connected through the anode (of the light-emitting diode) by the driving pulse signal output therefrom. When serving as a segment code digital terminal, it can control N - 1 light-emitting diodes connected through the cathode (of the light-emitting diode) by the driving pulse signal output therefrom. Thus, it can control as many light-emitting diodes as possible without increasing the number of driving ports, thereby saving driving ports.

[0070] In an exemplary embodiment, referring to Figure 1 , N×(N - 1) light-emitting diodes are arranged in an array of N - 1 rows and N columns.

[0071] Referring to Figure 1 , the identifier of each driving port is IOn, where n represents the sorting of this driving port among all driving ports; the identifier of each light-emitting diode is LEDij, where i represents the row number where this light-emitting diode is located in the array, and j represents the column number where this light-emitting diode is located in the array.

[0072] In this embodiment, by arranging N×(N - 1) light-emitting diodes in an orderly manner into an array of N - 1 rows and N columns, a reasonable layout of multiple light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0073] In an exemplary embodiment, N×(N - 1) light-emitting diodes are divided into N groups of first light-emitting diodes by rows; N×(N - 1) light-emitting diodes are divided into N groups of second light-emitting diodes by columns.

[0074] Each driving port is connected to the anodes of all the light-emitting diodes in a group of first light-emitting diodes and the cathodes of all the light-emitting diodes in a group of second light-emitting diodes.

[0075] Specifically, for each driving port, according to the connection manner between this driving port and each of the connected light-emitting diodes, the light-emitting diodes connected to this driving port can be divided into first light-emitting diodes and second light-emitting diodes; among them, the first light-emitting diodes are the light-emitting diodes connected to this driving port through the anode (of the light-emitting diode), and the second light-emitting diodes are the light-emitting diodes connected to this driving port through the cathode (of the light-emitting diode). For example, referring to Figure 1 , for IO1, LED12 - LED1N are the first light-emitting diodes corresponding to IO1, and LED11 - LED(N - 1)1 are the second light-emitting diodes corresponding to IO1.

[0076] Furthermore, the column numbers where the first light-emitting diodes connected to each driving port are located in the array are different from the column numbers where the second light-emitting diodes connected to the driving port are located in the array.

[0077] For example, Figure 2 shows another schematic diagram of the driving circuit of the light-emitting diode provided by the present invention; referring to Figure 2 , taking the number of driving ports as 4, that is, N = 4 as an example, for IO1, the first light-emitting diodes it connects are LED12, LED13, and LED14 (the column numbers are the 2nd, 3rd, and 4th columns), and the second light-emitting diodes it connects are LED11, LED21, and LED31 (the column number is the 1st column); for IO2, the first light-emitting diodes it connects are LED21, LED23, and LED24 (the column numbers are the 1st, 3rd, and 4th columns), and the second light-emitting diodes it connects are LED12, LED22, and LED32 (the column number is the 2nd column); for IO3, the first light-emitting diodes it connects are LED31, LED32, and LED34 ((the column numbers are the 1st, 2nd, and 4th columns), and the second light-emitting diodes it connects are LED13, LED23, and LED33 (the column number is the 3rd column); for IO4, the first light-emitting diodes it connects are LED11, LED22, and LED33 (the column numbers are the 1st, 2nd, and 3rd columns), and the second light-emitting diodes it connects are LED14, LED24, and LED34 (the column number is the 4th column).

[0078] For another example, Figure 3 shows yet another schematic diagram of the driving circuit of the light-emitting diode provided by the present invention; referring to Figure 3 , taking the number of driving ports as 4, that is, N = 4 as an example, for IO1, the first light-emitting diodes it connects are LED12, LED13, and LED14 (the column numbers are the 2nd, 3rd, and 4th columns), and the second light-emitting diodes it connects are LED11, LED21, and LED31 (the column number is the 1st column); for IO2, the first light-emitting diodes it connects are LED11, LED23, and LED24 (the column numbers are the 1st, 3rd, and 4th columns), and the second light-emitting diodes it connects are LED12, LED22, and LED32 (the column number is the 2nd column); for IO3, the first light-emitting diodes it connects are LED21, LED32, and LED34 ((the column numbers are the 1st, 2nd, and 4th columns), and the second light-emitting diodes it connects are LED13, LED23, and LED33 (the column number is the 3rd column); for IO4, the first light-emitting diodes it connects are LED31, LED32, and LED33 (the column numbers are the 1st, 2nd, and 3rd columns), and the second light-emitting diodes it connects are LED14, LED24, and LED34 (the column number is the 4th column).

[0079] In this embodiment, by setting the column numbers of each first light-emitting diode connected to each driving port and the column numbers of each second light-emitting diode connected to each driving port in the array, a reasonable layout of the connection lines between the driving ports and the light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0080] In an exemplary embodiment, the nth group of the N groups of first light-emitting diodes includes:

[0081] The second to the Nth light-emitting diodes in the first row of the array, where n = 1;

[0082] The first n - 1 light-emitting diodes in the (n - 1)th row of the array and the last N - n light-emitting diodes in the nth row, where 1 < n ≤ N - 1;

[0083] The first to the N - 1th light-emitting diodes in the (N - 1)th row of the array, where n = N;

[0084] The nth group of the N groups of second light-emitting diodes includes the light-emitting diodes in the nth column of the array, where 1 ≤ n ≤ N;

[0085] Wherein, the anodes of the first light-emitting diodes in the same group are connected to the same driving port, and the cathodes of the second light-emitting diodes in the same group are connected to the same driving port.

[0086] Specifically, referring to Figure 3 , taking the number of driving ports as 4, that is, N = 4 as an example, the 4 groups of first light-emitting diodes include:

[0087] The second to the fourth light-emitting diodes (LED12, LED13, and LED14) in the first row are the first group of first light-emitting diodes, and are connected to the same driving port through the corresponding anodes.

[0088] The first 1 light-emitting diode (LED11) in the first row and the last 2 light-emitting diodes (LED23 and LED24) in the second row are the second group of first light-emitting diodes, and are connected to the same driving port through the corresponding anodes.

[0089] The first 2 light-emitting diodes (LED21 and LED22) in the second row and the last 1 light-emitting diode (LED34) in the third row are the third group of first light-emitting diodes, and are connected to the same driving port through the corresponding anodes.

[0090] The first to the third light-emitting diodes (LED31, LED32, and LED33) in the third row are the fourth group of first light-emitting diodes, and are connected to the same driving port through the corresponding anodes.

[0091] The 4 groups of second light-emitting diodes include:

[0092] The light-emitting diodes (LED11, LED21, and LED31) in the first column are the second light-emitting diodes of the first group and are connected to the same driving port through their corresponding cathodes.

[0093] The light-emitting diodes (LED12, LED22, and LED32) in the second column are the second light-emitting diodes of the second group and are connected to the same driving port through their corresponding cathodes.

[0094] The light-emitting diodes (LED13, LED23, and LED33) in the third column are the second light-emitting diodes of the third group and are connected to the same driving port through their corresponding cathodes.

[0095] The light-emitting diodes (LED14, LED24, and LED34) in the fourth column are the second light-emitting diodes of the fourth group and are connected to the same driving port through their corresponding cathodes;

[0096] In this embodiment, by grouping the light-emitting diodes according to their positions in the array and then connecting the light-emitting diodes in the same group to the same driving port, a reasonable layout of the connection lines between the driving port and the light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0097] In an exemplary embodiment, N driving ports are arranged in sequence from top to bottom.

[0098] The anode of the first light-emitting diode in the nth group is connected to the nth driving port among the N driving ports.

[0099] The cathode of the second light-emitting diode in the nth group is connected to the nth driving port among the N driving ports.

[0100] Specifically, also referring to Figure 3 , 4 driving ports are arranged in sequence from top to bottom, which are IO1, IO2, IO3, and IO4 in turn; the anode of the first light-emitting diode in the first group and the cathode of the second light-emitting diode in the first group are connected to IO1, the anode of the first light-emitting diode in the second group and the cathode of the second light-emitting diode in the second group are connected to IO2, the anode of the first light-emitting diode in the third group and the cathode of the second light-emitting diode in the third group are connected to IO3, and the anode of the first light-emitting diode in the fourth group and the cathode of the second light-emitting diode in the fourth group are connected to IO4.

[0101] In this embodiment, by arranging the N driving ports in sequence from top to bottom and connecting the light-emitting diode groups based on the arrangement of the N driving ports, a reasonable layout of the connection lines between the driving port and the light-emitting diodes can be achieved, thereby reducing the layout space of the driving circuit.

[0102] In an exemplary embodiment, the pulse width of the pulse driving signal is positively correlated with the load capacity of the light emitting diode.

[0103] Since no current limiting resistor needs to be added in the driving circuit of the light emitting diode provided by the present invention, the pulse width of the pulse driving signal needs to be set according to the load capacity of the light emitting diode. Specifically, the pulse width of the driving pulse signal is positively correlated with the load capacity of the light emitting diode. For example, the larger the maximum current that the light emitting diode can withstand, the wider the pulse width can be accordingly.

[0104] Further, the maximum pulse width is 200 microseconds.

[0105] Furthermore, in order for the user to clearly see the content displayed by the LED, the minimum pulse width of the driving pulse signal output by the driving port is 50 microseconds; preferably, the pulse width is 125 microseconds.

[0106] In this embodiment, by reasonably setting the pulse width of the pulse driving signal based on the load capacity of the light emitting diode, the current flowing through the light emitting diode can be reasonably controlled, so that the light emitting diode can be protected even without a current limiting resistor, thereby saving the current limiting resistor.

[0107] In an exemplary embodiment, the number of multiple driving ports is 8, and the number of multiple light emitting diodes connected to the driving chip is 56.

[0108] Refer to Figure 4 , Figure 4 shows a schematic diagram of a driving circuit including 8 driving ports and 56 light emitting diodes.

[0109] In an exemplary embodiment, as Figure 5 shown, the present invention also provides a driving method for the driving circuit of a light emitting diode as in any one of the above embodiments. This embodiment takes the application of this method to the driving chip in the driving circuit of the light emitting diode as an example. The method includes the following steps:

[0110] Step S502, at preset intervals, sequentially set the pulse driving signal output by each driving port of the driving chip of the light emitting diode to a low level state, and scan each of the remaining driving ports corresponding to each driving port.

[0111] Specifically, the driving chip sequentially sets the pulse driving signal output by each driving port of the driving chip of the light emitting diode to a low level state at preset intervals. In this way, the driving port corresponding to the output set to the low level state will be set as the common terminal; then, the driving chip scans the remaining driving ports. In this way, the remaining driving ports will be set as the segment code digital terminals.

[0112] Step S504: When there is a lighting requirement for the light-emitting diodes connected to each of the remaining driving ports, set the driving pulse signals output by the remaining driving ports to the high-level state.

[0113] Among them, the light-emitting diodes to be driven are those with the cathodes of the light-emitting diodes to be driven connected to each driving port and the anodes of the light-emitting diodes to be driven connected to the remaining driving ports.

[0114] It is easy to understand that in the present invention, the principle of lighting a certain light-emitting diode is: set the driving port connected to the cathode of the light-emitting diode to the low-level state, and set the driving port connected to the anode of the light-emitting diode to the high-level state.

[0115] To make the technical solution of the present invention clearer, a detailed embodiment is used to describe in detail the driving method of the driving circuit of the light-emitting diodes provided by the present invention; taking Figure 4 the driving method of the driving circuit of the light-emitting diodes shown as an example, refer to Figure 4 , the driving chip first sets the driving pulse signal output by IO1 to the low-level state. At this time, IO1 serves as the common terminal, and IO2 to IO8 serve as the segment code digital terminals of LED11 to LED71 in sequence. Then, the driving chip scans IO2 to IO8. When any one of the light-emitting diodes among LED11 to LED71 needs to be lit, set the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO2 to IO8 to the high-level state, so as to light this light-emitting diode. For example, if LED11 needs to be lit, set the driving pulse signal output by IO2 to the high-level state; if LED41 needs to be lit, set the driving pulse signal output by IO5 to the high-level state.

[0116] Next, the driving chip sets the driving pulse signal output by IO2 to the low-level state. At this time, IO2 serves as the common terminal, and IO1, IO3 to IO8 serve as the segment code digital terminals of LED12 to LED72 in sequence. Then, the driving chip scans IO1, IO3 to IO8. When any one of the light-emitting diodes among LED12 to LED72 needs to be lit, set the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1, IO3 to IO8 to the high-level state, so as to light this light-emitting diode. For example, if LED32 needs to be lit, set the driving pulse signal output by IO4 to the high-level state; if LED52 needs to be lit, set the driving pulse signal output by IO6 to the high-level state.

[0117] Next, the driving chip sets the driving pulse signal output by IO3 to the low level state. At this time, IO3 serves as the common terminal, and IO1, IO2, and IO4 to IO8 serve as the segment code digital terminals of LED13 to LED73 in sequence. Then, the driving chip scans IO1, IO2, and IO4 to IO8. When any one of the light emitting diodes from LED13 to LED73 needs to be lit, the driving pulse signal output by the IO port connected to the anode of this light emitting diode among IO1, IO2, and IO4 to IO8 is set to the high level state, thereby lighting this light emitting diode. For example, if LED13 needs to be lit, the driving pulse signal output by IO1 is set to the high level state; if LED73 needs to be lit, the driving pulse signal output by IO8 is set to the high level state.

[0118] Repeat this process until the driving chip sets the driving pulse signal output by IO8 to the low level state and finishes scanning IO1 to IO7, completing one round of scanning of 56 light emitting diodes.

[0119] For the specific limitations in the above embodiments of the driving method, reference can be made to the limitations on the driving circuit in the foregoing text, which will not be elaborated herein.

[0120] In this embodiment, through a driving circuit in which each driving port is connected to the anodes of multiple light emitting diodes and also to the cathodes of multiple light emitting diodes, the driving chip can enable the multiplexing of the common terminal and the segment code digital segment on the same driving port, thereby saving driving ports; by driving the light emitting diodes with the pulse driving signal output by the driving port, the driving chip can reasonably control the current flowing through the light emitting diodes, so as to protect the light emitting diodes even without a current limiting resistor, and further save the current limiting resistor; therefore, the layout space of the driving circuit is reduced.

[0121] In an exemplary embodiment, before step S502 above, specifically before sequentially setting the pulse driving signals output by each driving port of the driving chip of the light emitting diodes to the low level state at a preset interval time, the following further includes: setting the pulse driving signals output by each driving port of the driving chip to the floating input state.

[0122] The driving method provided by the present invention specifically further includes the following: when there is no lighting requirement for the light emitting diodes connected to each of the remaining driving ports, keeping the driving pulse signals output by the remaining driving ports in the floating input state.

[0123] Specifically, before the start of each round of scanning, the driving chip sets the pulse driving signals output by each driving port of the driving chip to the floating input state.

[0124] In an exemplary embodiment, the driving method provided by the present invention further includes the following: for each driving port, after the scanning of the remaining driving ports corresponding to this driving port is completed, the driving pulse signal output by this driving port is restored to the floating input state.

[0125] In an exemplary embodiment, the pulse width of the driving pulse signal output by the driving port is determined according to the load capacity of the light-emitting diode.

[0126] Furthermore, the pulse width of the driving pulse signal is positively correlated with the load capacity of the light-emitting diode.

[0127] Still further, the maximum pulse width of the driving pulse signal output by the driving port is 200 microseconds.

[0128] Even further, in order to enable the user to clearly see the content displayed by the LED, the minimum pulse width of the driving pulse signal output by the driving port is 50 microseconds; preferably, the pulse width is 125 microseconds.

[0129] In an exemplary embodiment, the pulse width of the driving pulse signal also needs to be consistent with a preset time interval.

[0130] In an exemplary embodiment, the preset interval time needs to make the complete scanning cycle corresponding to all driving ports meet the conditions corresponding to the human eye's ability to recognize the flashing of the indicator light.

[0131] Wherein, the complete scanning cycle is the complete time required to scan all driving ports according to the preset time interval. For example, if the preset interval time is 125 microseconds and there are 8 driving ports, then the complete scanning cycle is 125 microseconds × 8 = 1 millisecond.

[0132] Wherein, the conditions corresponding to the human eye's ability to recognize the flashing of the indicator light refer to the conditions under which the human eye cannot recognize the flashing of the indicator light. For example, the human eye cannot recognize the flashing of an indicator light for 1 millisecond.

[0133] Preferably, for 8 driving ports, the preset interval time is 125 microseconds, so the pulse width is also 125 microseconds.

[0134] Preferably, the program for the time-division scanning process of the light-emitting diode is placed in the timer interrupt service program of the driving chip.

[0135] To more clearly illustrate the driving circuit and driving method of the light-emitting diode provided by the embodiments of the present invention, the following uses a specific embodiment to specifically describe the driving circuit and driving method of the light-emitting diode. However, it should be understood that the embodiments of the present invention are not limited thereto. In an exemplary embodiment, the present invention also provides a driving circuit and driving method for an LED display that can save I / O ports and current-limiting resistors. Taking the driving circuit driving 56 LEDs with 8 I / O ports as an example for illustration:

[0136] Refer to Figure 4 , assuming that the driving chip has 8 I / O ports, these 8 I / O ports are respectively labeled as IO1 to IO8, and the 56 LEDs are arranged in a 7-row and 8-column array. Each LED is labeled as LEDij according to its position in the array, where i is the row number of the LED in the array and j is the column number of the LED in the array.

[0137] Connect the anodes of a total of 7 LEDs from LED12 to LED18 to IO1; connect the anodes of a total of 7 LEDs including LED11 and LED23 to LED28 to IO2; connect the anodes of a total of 7 LEDs including LED21, LED22 and LED34 to LED38 to IO3; connect the anodes of a total of 7 LEDs including LED31 to LED33 and LED45 to LED48 to IO4; connect the anodes of a total of 7 LEDs including LED41 to LED44 and LED56 to LED58 to IO5; connect the anodes of a total of 7 LEDs including LED51 to LED55 and LED67, LED68 to IO6; connect the anodes of a total of 7 LEDs including LED61 to LED66 and LED78 to IO7; connect the anodes of a total of 7 LEDs from LED71 to LED77 to IO8.

[0138] Connect the cathodes of a total of 7 LEDs from LED11 to LED71 to IO1; connect the cathodes of a total of 7 LEDs from LED12 to LED72 to IO2; connect the cathodes of a total of 7 LEDs from LED13 to LED73 to IO3; connect the cathodes of a total of 7 LEDs from LED14 to LED74 to IO4; connect the cathodes of a total of 7 LEDs from LED15 to LED75 to IO5; connect the cathodes of a total of 7 LEDs from LED16 to LED76 to IO6; connect the cathodes of a total of 7 LEDs from LED17 to LED77 to IO7; connect the cathodes of a total of 7 LEDs from LED18 to LED78 to IO8.

[0139] On the one hand, in the above-mentioned driving circuit, each IO port can serve as both a common port and a segment code digital terminal through time-sharing, and both the common cathode and common anode connection methods are adopted. Therefore, with the driving circuit of the present invention, N IO ports can drive N×(N−1) LEDs, thus saving driving ports; on the other hand, in the above-mentioned driving circuit, there is no need to add current-limiting resistors, so current-limiting resistors are saved; furthermore, based on the above-mentioned driving circuit, the layout space of the driving circuit can be reduced.

[0140] The working principle and working process of the driving circuit provided in this embodiment are described below: According to the characteristics of LEDs, their pulse current can reach 100 mA. Therefore, if pulse driving is used for LEDs, there is no need to connect current-limiting resistors. However, in order to protect the light-emitting diodes, the pulse width of the driving pulse must be limited within 200 microseconds. Preferably, the driving pulse width is 125 microseconds. In order to ensure the uniform brightness of the LEDs, the program for time-sharing scanning processing of the LEDs is placed in the timer interrupt service program of the driving chip, and it is scanned once every 125 microseconds.

[0141] If there are N IO ports and they are scanned once every 125 microseconds, it takes N scans to complete one round of full scanning. If there are 8 IO ports, then 8 scans are required, and it takes 8 times 125 microseconds, that is, 1 millisecond, to complete one round. Since the human eye is completely unable to recognize the flicker of an indicator light within 1 millisecond, this scanning period fully meets the product requirements.

[0142] Specifically, the driving method provided in this embodiment divides each IO into 3 states, namely floating input state, output high level state, and output low level state. If a certain LED needs to be lit, then set the IO connected to the anode of the LED to the output high level state, and the IO connected to the cathode of the LED to the output low level state. Refer to Figure 4 , taking the example of driving 56 LEDs with 8 IO ports to illustrate this driving method: The driving chip first sets the driving pulse signals output by each IO port to the floating input state, then sets the driving pulse signal output by IO1 to the low level state, and scans IO2 to IO8. When any one of the light-emitting diodes among LED11 to LED71 needs to be lit, then set the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO2 to IO8 to the high level state, thereby lighting this light-emitting diode.

[0143] After 125 microseconds, the driving chip sets the driving pulse signal output by IO2 to the low level state, and scans IO1, IO3 to IO8. When any one of the light-emitting diodes among LED12 to LED72 needs to be lit, then set the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1, IO3 to IO8 to the high level state, thereby lighting this light-emitting diode.

[0144] After 125 microseconds, the driving chip sets the driving pulse signal output by IO3 to a low level state, and scans IO1, IO2, IO4 to IO8. When any one of the light-emitting diodes from LED13 to LED73 needs to be lit, the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1, IO2, IO4 to IO8 is set to a high level state, thereby lighting this light-emitting diode.

[0145] After 125 microseconds, the driving chip sets the driving pulse signal output by IO4 to a low level state, and scans IO1 to IO3, IO5 to IO8. When any one of the light-emitting diodes from LED14 to LED74 needs to be lit, the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1 to IO3, IO5 to IO8 is set to a high level state, thereby lighting this light-emitting diode.

[0146] After 125 microseconds, the driving chip sets the driving pulse signal output by IO5 to a low level state, and scans IO1 to IO4, IO6 to IO8. When any one of the light-emitting diodes from LED15 to LED75 needs to be lit, the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1 to IO4, IO6 to IO8 is set to a high level state, thereby lighting this light-emitting diode.

[0147] After 125 microseconds, the driving chip sets the driving pulse signal output by IO6 to a low level state, and scans IO1 to IO5, IO7, IO8. When any one of the light-emitting diodes from LED16 to LED76 needs to be lit, the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1 to IO5, IO7, IO8 is set to a high level state, thereby lighting this light-emitting diode.

[0148] After 125 microseconds, the driving chip sets the driving pulse signal output by IO7 to a low level state, and scans IO1 to IO6, IO8. When any one of the light-emitting diodes from LED17 to LED77 needs to be lit, the driving pulse signal output by the IO port connected to the anode of this light-emitting diode among IO1 to IO6, IO8 is set to a high level state, thereby lighting this light-emitting diode.

[0149] After 125 microseconds, the driving chip sets the driving pulse signal output by IO8 to a low level state, and scans IO1 to IO7. When any one of the light-emitting diodes from LED18 to LED78 needs to be lit, the driving pulse signal output by the IO port connected to the anode of the light-emitting diode among IO1 to IO7 is set to a high level state, thereby lighting the light-emitting diode.

[0150] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps in other steps.

[0151] Based on the same inventive concept, an embodiment of the present invention further provides a driving device for a driving circuit of a light-emitting diode for implementing the driving method of the driving circuit of the light-emitting diode described above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the driving device of the driving circuit of the light-emitting diode provided below can refer to the limitations on the driving method of the driving circuit of the light-emitting diode in the above text, and will not be repeated here.

[0152] In an exemplary embodiment, as Figure 6 shown, a driving device for a driving circuit of a light-emitting diode is provided, including: a scanning module 602 and a lighting module 604, where:

[0153] The scanning module 602 is configured to sequentially set the pulse driving signal output by each driving port of the driving chip of the light-emitting diode to a low level state at a preset interval time, and scan the remaining driving ports.

[0154] The lighting module 604 is configured to set the driving pulse signal output by the driving port of the light-emitting diode to be driven that has a lighting requirement to a high level state when there is a lighting requirement for the light-emitting diode to be driven connected to the remaining driving ports; the light-emitting diode to be driven is a light-emitting diode whose cathode is connected to each driving port and whose anode is connected to the remaining driving ports.

[0155] In an exemplary embodiment, the driving device of the driving circuit of the light-emitting diode further includes an initial module configured to set the pulse driving signals output from the respective driving ports of the driving chip to a floating input state.

[0156] The lighting module 604 is further configured to maintain the driving pulse signal output from the driving port connected to the light-emitting diode to be driven without a lighting requirement in a floating input state when there is no lighting requirement for the light-emitting diodes to be driven connected to the remaining driving ports.

[0157] Each module in the driving device of the driving circuit of the above-mentioned light-emitting diode can be implemented in whole or in part by software, hardware, and combinations thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above-mentioned respective modules.

[0158] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided by the present invention can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided by the present invention can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0159] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0160] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A driving circuit for a light-emitting diode, characterized in that, The driving circuit of the light-emitting diode includes a driving chip and a plurality of light-emitting diodes connected to the driving chip; The driving chip includes a plurality of driving ports, and each driving port is connected to the anodes and cathodes of a plurality of light-emitting diodes; each driving port drives the connected light-emitting diodes through a pulse driving signal; The anode and cathode of the same light-emitting diode are respectively connected to different driving ports; Among the plurality of light-emitting diodes, when the anodes of two light-emitting diodes are connected to the same driving port, the cathodes of the two light-emitting diodes are respectively connected to different driving ports; when the cathodes of two light-emitting diodes are connected to the same driving port, the anodes of the two light-emitting diodes are respectively connected to different driving ports.

2. The driving circuit of the light-emitting diode according to claim 1, characterized in that, The number of the plurality of driving ports is N, and the number of the plurality of light-emitting diodes connected to the driving chip is N×(N−1).

3. The driving circuit of the light-emitting diode according to claim 2, wherein Each driving port is connected to the anodes of N−1 light-emitting diodes and the cathodes of N−1 light-emitting diodes.

4. The driving circuit of the light-emitting diode according to claim 2, wherein The N×(N−1) light-emitting diodes are arranged in an array of N−1 rows and N columns.

5. The driving circuit of the light-emitting diode according to claim 4, wherein The N×(N−1) light-emitting diodes are divided into N groups of first light-emitting diodes by row; The N×(N−1) light-emitting diodes are divided into N groups of second light-emitting diodes by column; Each driving port is connected to the anodes of all the light-emitting diodes in a group of first light-emitting diodes and the cathodes of all the light-emitting diodes in a group of second light-emitting diodes; The column numbers of the respective first light-emitting diodes connected to each driving port in the array are different from the column numbers of the respective second light-emitting diodes connected to the driving port in the array.

6. The driving circuit of the light-emitting diode according to claim 5, characterized in that The nth group of first light-emitting diodes in the N groups of first light-emitting diodes includes: The second to Nth light-emitting diodes in the first row of the array, where n = 1; The first n−1 light-emitting diodes in the (n−1)th row and the last N−n light-emitting diodes in the nth row of the array, where 1 < n ≤ N−1; The first to N−1th light-emitting diodes in the (N−1)th row of the array, where n = N; The nth group of second light-emitting diodes in the N groups of second light-emitting diodes includes the light-emitting diodes in the nth column of the array, where 1 ≤ n ≤ N; Wherein, the anodes of the light-emitting diodes in the same group of first light-emitting diodes are connected to the same driving port, and the cathodes of the light-emitting diodes in the same group of second light-emitting diodes are connected to the same driving port.

7. The driving circuit of a light-emitting diode according to claim 6, characterized in that, The N driving ports are arranged in sequence from top to bottom; The anodes of the nth group of first light-emitting diodes are connected to the nth driving port among the N driving ports; The cathodes of the nth group of second light-emitting diodes are connected to the nth driving port among the N driving ports.

8. The driving circuit of a light-emitting diode according to claim 1, wherein, The pulse width of the pulse driving signal is positively correlated with the load capacity of the light-emitting diode.

9. A driving method for a driving circuit of a light-emitting diode according to any one of claims 1 to 8, characterized in that, The method includes: At preset interval times, sequentially set the pulse driving signals output by each driving port of the driving chip of the light-emitting diode to the low level state, and scan each of the remaining driving ports corresponding to each driving port; When there is a lighting requirement for the light-emitting diodes to be driven connected to each of the remaining driving ports, set the driving pulse signal output from the remaining driving ports to a high level state; the light-emitting diodes to be driven are those with the cathodes of the light-emitting diodes to be driven connected to each driving port and the anodes of the light-emitting diodes to be driven connected to the remaining driving ports.

10. The method according to claim 9, characterized in that, Before sequentially setting the pulse driving signals output from each driving port of the driving chip of the light-emitting diodes to a low level state at a preset interval time, it further includes: Set the pulse driving signals output from the respective driving ports of the driving chip to a floating input state; The method further includes: When there is no lighting requirement for the light-emitting diodes to be driven connected to each of the remaining driving ports, keep the driving pulse signals output from the remaining driving ports in the floating input state.

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