A dynamic display light intelligent control circuit

Abstract

The present invention discloses a dynamic display light intelligent control circuit, comprising: a constant current drive unit group providing constant current drive, an intelligent controller outputting row and column drive control signals, and an LED drive unit array that selects the LED light group of the corresponding row according to the row drive control signal of the first state within a preset time period, and then drives the LED light group of the corresponding column in the selected row to be lit according to the column drive control signal of the first level. The present invention controls the operation of the LED drive unit at the intersection of the corresponding row and column by forming a logical combination relationship between the row drive control signal and the column drive control signal, and then controls the corresponding LED light group to be lit, thereby realizing dynamic scanning and lighting of multiple LED light groups, realizing streamer turn signal control, and combining different water flow effects, and can reduce the number of occupied input and output pins of the intelligent controller, reduce the number of required constant current drive units, and effectively reduce the cost of the entire circuit.

Description

Technical Field

[0001] The invention relates to the field of control technology, and in particular to an intelligent control circuit for a dynamic display lamp. Background Art

[0002] With the development of the national economy, cars are appearing in more and more families. With the rapid development of the automobile industry, people's requirements for cars are getting higher and higher. In the automobile lighting system, automobile display lights can be divided into two types, indicator lights and decorative lights. Indicator lights can indicate the driving status of the car, such as turn signals; decorative lights play a role in improving the appearance of the vehicle and can be installed in many parts of the car, such as door handles.

[0003] With the development of LED lighting technology, LEDs have also begun to be widely used in automotive lighting systems. People have begun to pursue more dazzling display effects, and flowing dynamic display lights have gradually been applied to indicator lights and decorative lights. At present, there are sequential streamer turn signal functions similar to the effect of a marquee on the headlights and taillights of cars. In order to unify the display effect of the streamer turn signal on the headlights and taillights, the turn signal on the exterior rearview mirror also needs to be made into a streamer turn signal. In the prior art, the streamer turn signal is mostly based on a microcontroller unit (MCU), which controls the LED light source through programming.

[0004] Please refer to Figure 1 , a schematic diagram of the architecture of an existing dynamic display light intelligent control circuit. The circuit includes: a constant current drive unit 11, an intelligent controller 12, an LED drive unit 13 and an LED lamp 14. The constant current drive unit 11 is used to provide constant current drive to the LED light source group 14. The intelligent controller 12 is configured to output a drive control signal through its input and output pins IO1~IOn. The LED drive unit 13 uses a triode to drive the corresponding LED lamp 14 to dynamically light up according to the drive control signal. By programming the intelligent controller 12 to control the corresponding LED lamp to be lit separately through its different input and output pins, different flowing water effects can be combined.

[0005] However, in the existing dynamic display light intelligent control circuit, each LED lamp requires a constant current drive unit and occupies an input / output pin of the intelligent controller. When there are more LED lamps, the circuit needs to be equipped with more constant current drive units and an intelligent controller with more input / output pins, which will cause a significant increase in the cost of the entire circuit.

[0006] Therefore, how to use a relatively simple circuit structure to achieve the control of streamer turn signals, optimize the control effect and reduce the control cost has become a technical problem that needs to be urgently solved in the development of streamer turn signals. Summary of the invention

[0007] The purpose of the present invention is to provide a dynamic display light intelligent control circuit to address the technical problems existing in the prior art, which can use a relatively simple circuit structure to achieve dynamic control of the dynamic display light, optimize the control effect and reduce the control cost.

[0008] To achieve the above-mentioned purpose, the present invention provides a dynamic display light intelligent control circuit, comprising: a constant current drive unit group including at least one constant current drive unit, and the constant current drive unit is configured to provide constant current drive to the LED light groups arranged in an array; an intelligent controller is configured to output a row drive control signal through its row input and output pins and output a column drive control signal through its column input and output pins; an LED drive unit array includes at least one LED drive unit, and the LED drive unit is configured to select the LED light group of the corresponding row according to the row drive control signal of the first state within a preset time period, and then drive the LED light group of the corresponding column in the selected row to be illuminated according to the column drive control signal of the first level.

[0009] The advantages of the present invention are as follows: the present invention controls the operation of the LED driving units at the intersection of the corresponding rows and columns, and then controls the corresponding LED light groups to be lit, thereby realizing dynamic scanning and lighting of multiple LED light groups, realizing streamer turn signal control, and combining different water flow effects, and can reduce the number of occupied input and output pins of the intelligent controller, reduce the number of required constant current driving units, and effectively reduce the cost of the entire circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 , a schematic diagram of the architecture of the existing dynamic display light intelligent control circuit;

[0011] Figure 2 , a schematic diagram of the architecture of the intelligent control circuit of the dynamic display light of the present invention;

[0012] Figure 3 for Figure 2 A detailed view of an embodiment of part A;

[0013] Figure 4 , a schematic diagram of a working waveform of an embodiment of a row drive control signal;

[0014] Figure 5 , a schematic diagram of an embodiment of the pin extension of the intelligent controller of the present invention;

[0015] Figure 6 , a schematic diagram of an embodiment of an LED lamp assembly of the present invention. DETAILED DESCRIPTION

[0016] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. In addition, the present invention repeats reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0017] Please refer to Figure 2-Figure 3 ,in, Figure 2 Schematic diagram of the structure of the intelligent control circuit of the dynamic display light of the present invention, Figure 3 for Figure 2 Detailed view of an embodiment of part A in FIG.

[0018] like Figure 2 As shown, the dynamic display light intelligent control circuit includes: a constant current drive unit group, an intelligent controller 22 and an LED drive unit array 23.

[0019] The constant current drive unit group includes at least one constant current drive unit 21, and the constant current drive unit 21 is configured to provide constant current drive to the LED light groups 24 arranged in an array. The constant current drive unit group includes at least one constant current drive unit 21, and the constant current drive unit 21 can adopt an existing conventional constant current drive circuit to achieve constant current drive for the corresponding LED light group 24.

[0020] The intelligent controller 22 is configured to output row drive control signals SR (such as the illustrated signals SR1, SR2, SR3) through its row input and output pins (such as the illustrated pins IO1, IO2, IO3) and to output column drive control signals SC (such as the illustrated signals SC1, SC2, SC3) through its column input and output pins (such as the illustrated pins IO4, IO5, IO6).

[0021] The LED driving unit array includes at least one LED driving unit 23, and the LED driving unit 23 is configured to select the LED light group 24 of the corresponding row according to the row driving control signal of the first state (any one of SR1, SR2, and SR3 is the first state) within a preset time period, and then drive the LED light group 24 of the corresponding column in the selected row to be lit according to the column driving control signal of the first level (any one of SC1, SC2, and SC3 is the first level). That is, for each LED light group 24, which is controlled by two input signals (SR, SC), when the row driving control signal SR is in the first state and the column driving control signal SC is at the first level, the corresponding LED driving unit 23 works, so that the corresponding LED light group 24 is lit.

[0022] like Figure 3 As shown, in this embodiment, the LED driving unit 23 uses a transistor Q1. The control end of the transistor Q1 receives the row driving control signal SR through a first resistor R1, and receives the column driving control signal SC through the first resistor R1 and a second resistor R2 connected in series. The first end of the transistor Q1 is electrically connected to the LED light group row, and the second end of the transistor Q1 is grounded. Specifically, the transistor Q1 uses an NPN type transistor, the base of the transistor is used as the control end of the transistor Q1, the collector of the transistor is used as the first end of the transistor Q1, and the emitter of the transistor is used as the second end of the transistor Q1. When the input row driving control signal SR is in a high impedance state, the transistor Q1 has a conduction condition, and further when the input column driving control signal SC is at a high level, the transistor Q1 is turned on and enters a working state, so that the corresponding LED light group is lit.

[0023] In a further embodiment, when the row drive control signal SR of a row is in the second state, the LED light group in the row is in an unselected state. At this time, even if the column drive control signal SC of a column in the row is at the first level, the corresponding LED light group 24 cannot be lit; that is, when the row drive control signal SR of a row is in the second state, the LED light group in the row is in an unselected state, and the LED light groups in the row will not be lit.

[0024] In a further embodiment, the first state of the row drive control signal SR is a high impedance state, and the first level of the column drive control signal SC is a high level. Correspondingly, the second state of the row drive control signal SR is a low level state, and the second level of the column drive control signal SC is a low level. When the row drive control signal SR of a row is in a high impedance state, if the column drive control signal SC of a column is at a high level, the LED drive unit 23 at the intersection of the corresponding row and column works, so that the corresponding LED light group 24 is lit; when the row drive control signal SR of a row is at a low level, even if the column drive control signal SC of a column is at a high level, the LED drive unit 23 at the intersection of the corresponding row and column cannot work, that is, the corresponding LED light group 24 cannot be lit. In this way, a logical combination relationship between a row drive control signal SR and a column drive control signal SC is formed to control the operation of the LED drive unit at the intersection of the corresponding rows and columns, and then control the corresponding LED light group 24 to be lit, thereby realizing dynamic scanning and lighting of multiple LED light groups 24, realizing streamer turn signal control, and combining different water flow effects, and reducing the number of input and output pins occupied by the intelligent controller. As shown in the figure, there are 9 LED light groups 24 in 3 rows and 3 columns, and the total number of input and output pins required for the intelligent controller 22 is 6, which reduces the number of input and output pins occupied by the intelligent controller, thereby effectively reducing the cost of the entire circuit.

[0025] In a further embodiment, the number of constant current driving units 21 in the constant current driving unit group is the same as the number of columns of the LED light groups 24 arranged in the array, and each constant current driving unit 24 is configured to provide constant current drive to all LED light groups 24 in the corresponding column. As shown in the figure, there are 9 LED light groups 24 in 3 rows and 3 columns, and the number of constant current driving units 21 required is 3. The constant current driving unit 21 located in the first column passes the driving current I1 through all the LED light groups 24 in the first column, the constant current driving unit 21 located in the second column passes the driving current I1 through all the LED light groups 24 in the second column, and the constant current driving unit 21 located in the third column passes the driving current I1 through all the LED light groups 24 in the third column. This design of the present invention significantly reduces the number of required constant current driving units, thereby effectively reducing the cost of the entire circuit.

[0026] In a further embodiment, the LED driving unit 23 corresponds to the LED light group 24 one by one, and the number of rows of the LED driving unit array is greater than or equal to the number of columns; and preferably, the number of rows and columns of the LED driving unit array is greater than 2. For example, the LED driving unit array can be 3 rows and 3 columns as shown in the figure, or 3 rows and 2 columns, 4 rows and 4 columns, 4 rows and 3 columns, 4 rows and 2 columns, etc. Since only one constant current driving unit 21 is required for each column, the array arrangement mode in which the rows and columns are the same or the number of rows is greater than the number of columns can reduce the number of constant current driving units required while reducing the number of input and output pins occupied by the intelligent controller, so that when there are more LED light groups, constant current driving units can be significantly saved, the number of input and output pins occupied by the intelligent controller can be reduced, and the cost of the entire circuit can be effectively reduced.

[0027] The following combination Figure 2 , Figure 4 The working principle of the dynamic display light intelligent control circuit of the present invention is described, wherein: Figure 4 FIG. 2 is a schematic diagram of the working waveform of an embodiment of a row drive control signal. Figure 2 As shown, there are three row drive control signals SR1, SR2, SR3 and three column drive control signals SC1, SC2, SC3, so they can be combined into a 3x3 matrix to dynamically scan the nine LED light groups 24. Figure 4As shown, in a preset time period (e.g., t0-t1), the row drive control signal SR1 corresponding to the first row is in a high impedance state, and the row drive control signals SR2 and SR3 corresponding to the second and third rows are in a low level state, then the LED light group 24 in the first row is selected, and is further controlled to light up by the three column drive control signals SC1, SC2, and SC3 respectively: when the column drive control signal SC1 corresponding to the first column is at a high level, the LED light group in the first row and the first column is lit; when the column drive control signal SC2 corresponding to the second column is at a high level, the LED light group in the first row and the second column is lit; when the column drive control signal SC3 corresponding to the third column is at a high level, the LED light group in the first row and the third column is lit. At this time, the LED light groups in the second and third rows are not selected and will not be lit up by the high-level column drive control signals. In the next preset time period (e.g., t1-t2), the row drive control signal SR2 corresponding to the second row is in a high impedance state, and the row drive control signals SR1 and SR3 corresponding to the first and third rows are in a low level state, then the LED light group 24 in the second row is selected, and is further controlled to light up by the three column drive control signals SC1, SC2, and SC3 respectively: when the column drive control signal SC1 corresponding to the first column is at a high level, the LED light group in the first column of the second row is lit; when the column drive control signal SC2 corresponding to the second column is at a high level, the LED light group in the second column of the second row is lit; when the column drive control signal SC3 corresponding to the third column is at a high level, the LED light group in the third column of the second row is lit. At this time, the LED light groups in the first and third rows are not selected and will not be lit up by the high-level column drive control signals. In the next preset time period (e.g., t2-t3), the row drive control signal SR3 corresponding to the third row is in a high impedance state, and the row drive control signals SR1 and SR2 corresponding to the first and second rows are in a low level state, then the LED light group 24 in the third row is selected, and is further controlled to light up by the three column drive control signals SC1, SC2, and SC3 respectively: when the column drive control signal SC1 corresponding to the first column is at a high level, the LED light group in the first column of the third row is lit; when the column drive control signal SC2 corresponding to the second column is at a high level, the LED light group in the second column of the third row is lit; when the column drive control signal SC3 corresponding to the third column is at a high level, the LED light group in the third column of the third row is lit. At this time, the LED light groups in the first and second rows are not selected and will not be lit up by the high-level column drive control signals. That is, during the time period t0~t1, t1~t2, and t2~t3, the row drive control signals SR1, SR2, and SR3 successively become high-impedance states, and the corresponding LED light groups in the first row, second row, and third row can be controlled to light up or not by the column drive control signals SC1, SC2, and SC3, respectively.It can be seen from this that the dynamic scanning mechanism of the present invention is that within a preset time period, a row drive control signal is in a high-impedance state, indicating that a row of LED light groups is selected, but whether each LED light group in this row is lit depends on whether the corresponding column drive control signal is valid within the preset time period.

[0028] exist Figure 2 Three row drive control signals SR1, SR2, SR3 and three column drive control signals SC1, SC2, SC3 are used, and a total of 6 signals can dynamically scan 9 LED light groups (3x3 matrix); at the same time, only 3 constant current drive units are used to drive 9 LED light groups. Further increasing the row drive control signal or column drive control signal can greatly increase the number of LED light groups that can be dynamically scanned. The number of LED light groups that can be scanned is the number of row drive control signals SR x the number of column drive control signals SC, and the number of constant current drive units required is the same as the total number of columns of the LED drive unit patent. For example, for the use of 4 row drive control signals and 4 column drive control signals, a total of 8 signals can dynamically scan 16 LED light groups (4x4 matrix), and the number of constant current drive units required is 4. The present invention can greatly reduce the occupation of the input and output pins of the intelligent controller, and the use of an intelligent controller with fewer pins can greatly reduce the cost of the entire circuit; the present invention can also greatly reduce the number of constant current drive units used, further reducing the cost of the entire circuit.

[0029] In a further embodiment, the constant current driving unit 21 is further configured to increase the constant current driving current according to the number of rows of the LED light groups arranged in the array. Preferably, the constant current driving current (i.e., LED dynamic scanning current) for lighting the corresponding LED light groups is N times the conventional continuous lighting current, where N is the number of rows of the LED light groups arranged in the array. Figure 4 The time intervals of the three scanning times t0~t1, t1~t2, and t2~t3 can be set shorter (for example, less than the preset time threshold), which makes Figure 2 The LED light groups in the middle 3 rows are not continuously lit, but the time interval between two lightings is very short. Due to the visual persistence effect of the human eye, the human eye cannot perceive the on-off flickering of the LED light groups between two lightings with a very short time interval, and it still looks like a continuous lighting effect. Further, according to the number of rows of LED light groups arranged in the array, the current of the constant current drive is increased. By increasing the current flowing through the LED light groups, the problem of reduced brightness of the LED light groups caused by the shortened lighting time of a single LED light group can be improved, so that the brightness of the LED light groups remains unchanged. For example, in the continuous lighting mode, Figure 2 The duration of each LED light group lighting up using dynamic scanning is about Figure 1Each LED light group using a separate control method is lit for one-third of the duration; Figure 2 The current flowing through the LED lamp group increases to Figure 1 Three times the current flowing through the LED lamp group can make Figure 2 The brightness of the LED light group remains unchanged after being lit. It should be noted that the increase multiple of the pulse current flowing through the LED light group is determined by the characteristics of the LED light group, rather than being increased arbitrarily. Specifically, the increase multiple can be determined by looking at the data and curve relationship diagram of the pulse current and continuous current in the LED light group specification.

[0030] Please refer to Figure 5 , a schematic diagram of an embodiment of the pin extension of the intelligent controller of the present invention. Figure 5 As shown, the circuit of the present invention further includes a pin extension unit 51. The pin extension unit 51 is configured to extend the row input and output pins and / or column input and output pins of the intelligent controller 22. Preferably, the pin extension unit 51 is configured to extend both the row input and output pins and the column input and output pins of the intelligent controller 22, or only the row input and output pins of the intelligent controller 22 can be extended. When there are many LED light groups that need to be dynamically scanned and lit, exceeding the matrix that can be formed by the number of input and output pins of the intelligent controller 22, the scanning matrix can be extended by extending the input and output pins. For example, by serially inputting the data of a small number (for example, 1-2) of input and output pins in the intelligent controller 22 into the pin extension unit 51 with a data shift function, the pin extension unit 51 outputs the data in parallel as multiple drive signals for matrix dynamic scanning, thereby saving the input and output pins of the intelligent controller. The input and output pins saved by the intelligent controller can be used for other functions, thereby further expanding the application scope of the intelligent controller. It should be noted that in addition to the pin expansion method of data shifting, other pin expansion methods can also be used, as long as the number of pins used by the intelligent controller for dynamic scanning of the LED matrix is ​​less than the number of signals required to complete the function of dynamic scanning of the LED matrix, thereby saving the cost of the entire circuit.

[0031] In a further embodiment, the pin extension unit 51 includes at least one data shift module 511. The data shift module 511 is configured to serially receive output data of a row of input and output pins of the intelligent controller 22, and then output multiple row drive control signals in parallel to extend the row input and output pins of the intelligent controller 22. For example, the data shift module 511 serially receives output data SR1 of the row input and output pin IO1 of the intelligent controller 22, and then outputs three row drive control signals SR11, SR12, and SR13 in parallel.

[0032] In a further embodiment, the data shift module 511 is further configured to serially receive output data of a column input / output pin of the intelligent controller 22, and then output multiple column drive control signals in parallel to expand the column input / output pins of the intelligent controller 22 (the dotted line indicates that it is an optional solution). For example, the data shift module 511 serially receives output data SC1 of the row input / output pin IO3 of the intelligent controller 22, and then outputs three column drive control signals SC11, SC12, and SC13 in parallel.

[0033] Please refer to Figure 6 , a schematic diagram of an embodiment of an LED lamp group of the present invention. In this embodiment, each LED lamp group includes a plurality of LED lamps connected in series and in parallel with each other; each LED lamp group may also include only one more LED lamp. That is, each LED lamp group in the circuit may be composed of one or several LED lamp strings connected in parallel, and the number of LEDs connected in series is determined by the operating voltage range provided by the vehicle body and the forward conduction voltage drop of the LED. If the operating voltage range provided by the vehicle body is 9V-16V, and the forward conduction voltage drop of the LED is 2.3V, three parallel LED lamp groups may be connected in series. The transistor in the figure is used as a transistor for driving the switch to light up each LED lamp group. In the figure of the above circuit example of the present invention, only one LED lamp is schematically depicted in an LED lamp group, but each LED lamp group can be regarded as composed of one or several LED lamp strings connected in parallel; when the LED lamp group is lit, all LED lamps in the LED lamp group will be lit at the same time. Such a design can keep the cost of the control circuit unchanged, while increasing the number of LED lamps that can be lit, saving the cost of the circuit.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A dynamic display light intelligent control circuit, characterized in that: include: The constant current driving unit group includes at least one constant current driving unit, and the constant current driving unit is configured to provide constant current driving to the LED lamp groups arranged in an array; An intelligent controller configured to output a row drive control signal through its row input / output pins and to output a column drive control signal through its column input / output pins; The LED driving unit array includes at least one LED driving unit, and the LED driving unit is configured to select the LED light group of the corresponding row according to the row driving control signal of the first state within a preset time period, and then drive the LED light group of the corresponding column in the selected row to be lit according to the column driving control signal of the first level, and the constant current driving unit is configured to increase the current of the constant current drive according to the number of rows of the LED light groups arranged in the array.

2. The circuit according to claim 1, characterized in that When the row driving control signal is in the second state, the LED light groups in the corresponding row are in an unselected state.

3. The circuit according to claim 1, characterized in that The first state of the row driving control signal is a high impedance state, and the first level of the column driving control signal is a high level.

4. The circuit according to claim 1, characterized in that The number of constant current driving units in the constant current driving unit group is the same as the number of columns of LED light groups arranged in the array, and each constant current driving unit is configured to provide constant current driving to all LED light groups in the corresponding column.

5. The circuit according to claim 1, characterized in that The LED driving units correspond to the LED light groups one by one, and the number of rows of the LED driving unit array is greater than or equal to the number of columns thereof.

6. The circuit according to claim 1, characterized in that The LED driving unit adopts a transistor, and the control end of the transistor receives the row driving control signal through a first resistor and receives the column driving control signal through the first resistor and a second resistor connected in series. The first end of the transistor is electrically connected to the LED lamp group row, and the second end of the transistor is grounded.

7. The circuit according to claim 1, characterized in that The circuit further includes a pin extension unit configured to extend the row input / output pins and / or column input / output pins of the intelligent controller.

8. The circuit according to claim 7, characterized in that The pin extension unit includes at least one data shift module configured to serially receive output data of a row of input and output pins of the intelligent controller, and then output multiple row drive control signals in parallel to expand the row input and output pins of the intelligent controller.

9. The circuit according to claim 8, characterized in that The data shift module is further configured to serially receive output data of a column of input and output pins of the intelligent controller, and then output a plurality of column drive control signals in parallel to expand the column input and output pins of the intelligent controller.

10. The circuit according to claim 1, characterized in that Each of the LED lamp groups includes one LED lamp or a plurality of LED lamps connected in series or parallel.

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