A single-line multi-color LED traffic display screen control system and method

Abstract

The present invention discloses a single-line multi-color LED traffic display screen control system and method. The system includes multiple multi-color LED modules, each of which is configured with a composite pixel data separation circuit and multiple LED display drive modules. The composite pixel data separation circuit is configured with a data transmission line and a transmission clock line. The data transmission line inputs multi-color composite pixel data synchronously and serially through a single line, and the transmission clock line is used to provide a data transmission clock signal; the composite pixel data separation circuit is used to separate pixel data of different colors and output them to the outside through corresponding monochrome pixel data output lines; multiple LED display drive modules are all connected with a pixel clock line, and LED display drive modules of the same color are connected in series with each other on the monochrome pixel data output line of the corresponding color. The effect is: the circuit structure is simple, the composite serial input of multi-color LED pixel data can be realized through a single data line, and the system has strong scalability; the correlation between each LED lamp bead is weak, and the circuit failure rate is low.

Description

Technical Field

[0001] The present invention relates to the technical field of LED control, and in particular to a control system and method for a single-line multi-color LED traffic display screen. Background Art

[0002] In order to improve the traffic order of motor vehicles, LED display screens are usually set up at traffic intersections to display some traffic prompt information, so as to provide motor vehicle drivers with prompts to drive, wait or stop in combination with the status of traffic lights.

[0003] In traditional LED display screens, each pixel point is usually only equipped with one lamp bead. This method has a relatively single color and limited luminous intensity, which cannot meet the needs of practical applications. Chinese Patent 201821721701.4 discloses an LED display unit and an LED display screen, in which multiple lamp beads are arranged at a luminous pixel point, so that the luminous intensity of the LED display unit can be enhanced while ensuring the uniformity of luminescence. At the same time, Chinese Patent 201811238737.1 also discloses an LED display screen and a traffic information display device. It can be seen that with the increase in the number of LED lamp beads in the device, the traditional LED drive circuit circuit structure is complex and it is difficult to meet the control requirements of the existing display screen. When a certain lamp bead fails, it is easy to cause a large area of ​​display blind area, and the circuit is also difficult to achieve blind spot detection. Summary of the invention

[0004] In view of this, the first object of the present invention is to provide a single-line multi-color LED traffic display screen control system, which realizes the control of the multi-color LED traffic display screen by serially transmitting data through a single data transmission line.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A single-line multi-color LED traffic display screen control system, the key of which is that it includes multiple multi-color LED modules, each of which is configured with a composite pixel data separation circuit and multiple LED display drive modules, the composite pixel data separation circuit is configured with a data transmission line and a transmission clock line, the data transmission line synchronously and serially inputs multi-color composite pixel data through a single line, and the transmission clock line is used to provide a data transmission clock signal; the composite pixel data separation circuit is used to separate pixel data of different colors and output them to the outside through corresponding monochrome pixel data output lines; the multiple LED display drive modules are all connected to the pixel clock line, and the LED display drive modules of the same color are connected in series with each other on the monochrome pixel data output line of the corresponding color.

[0007] Optionally, a plurality of D flip-flops are arranged in series in the composite pixel data separation circuit, the clock signal end of each D flip-flop is connected to the transmission clock line, the output end of each D flip-flop leads to a monochrome pixel data output line and pixel data of one color is separated from the data transmission line in turn.

[0008] Optionally, the multi-color LED module is a five-color LED module, and five D flip-flops are arranged in series in the composite pixel data separation circuit, and pixel data of five colors, red, green, blue, white and yellow, are separated in sequence.

[0009] Optionally, the number of LED display driving modules connected in series to each monochrome pixel data output line is the same, and each LED display driving module is connected to 16 LED lamp beads.

[0010] Optionally, each of the multi-color LED modules is configured with a discrete blind spot data composite circuit, and the discrete blind spot data composite circuit is configured with a data transmission line and a transmission clock line. The data transmission line outputs multi-color blind spot composite data through a single-line synchronous serial, and the transmission clock line is used to provide a data transmission clock signal; the discrete blind spot data composite circuit is configured with multiple monochrome blind spot data input lines and is used to composite blind spot data of different colors, the multiple LED display driving modules are all connected to a pixel clock line, and the LED display driving modules of the same color are connected in series to the monochrome blind spot data input line of the corresponding color.

[0011] Optionally, a plurality of D flip-flops are arranged in series in the discrete blind spot data compound circuit, the clock signal end of each D flip-flop is connected to the transmission clock line, a monochrome blind spot data input line is introduced into the input end of each D flip-flop and multi-color blind spot composite data is obtained by compounding in sequence from the data transmission line.

[0012] Optionally, five D flip-flops are arranged in series in the discrete blind spot data composite circuit, and blind spot data of five colors, red, green, blue, white and yellow, are input in sequence.

[0013] Optionally, the discrete blind spot data combination circuit and the composite pixel data separation circuit are connected to the same transmission clock line and pixel clock line.

[0014] Optionally, multiple multi-color LED modules are arranged in sequence, and the data transmission line at the input end of the composite pixel data separation circuit of the first multi-color LED module receives the synchronous serial input of the multi-color composite pixel data, and the data transmission line at the output end of the composite pixel data separation circuit of the first multi-color LED module is connected to the input end of the composite pixel data separation circuit of the second multi-color LED module as a multi-color composite pixel data loop output interface, and the connections are made in sequence, and the output end of the composite pixel data separation circuit of the last multi-color LED module is connected to the input end of the corresponding discrete blind spot data composite circuit as a multi-color blind spot data composite input interface, and the data transmission lines of the discrete blind spot data composite circuits of multiple multi-color LED modules are then connected in reverse order, and finally the multi-color blind spot data composite serial output is obtained from the output end of the discrete blind spot data composite circuit of the first multi-color LED module.

[0015] In addition, the second purpose of the present invention is to provide a single-line multi-color LED traffic display screen control method, which adopts the single-line multi-color LED traffic display screen control system described above. The key is to connect multiple multi-color LED modules in series, realize synchronous serial input of multi-color composite pixel data through a single line, separate the multi-color composite pixel data into pixel data of different colors through the data transmission clock signal provided by the data transmission line, and then load the pixel data of different colors into the corresponding LED display driver module through the pixel clock provided by the pixel clock line.

[0016] Compared with the prior art, the present invention has the following remarkable effects:

[0017] 1. The circuit structure is simple and easy to install. It adopts single-line multi-color separation technology. It can realize composite serial input of multi-color LED pixel data through a single data line, and the system has strong scalability;

[0018] 2. The correlation between each LED lamp is weak, the circuit failure rate is low, which reduces the real-time requirements for equipment maintenance and saves maintenance costs;

[0019] 3. It is convenient for blind spot detection and can provide real-time feedback of blind spot data, providing a reference for equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a circuit principle block diagram of a specific embodiment of the present invention;

[0022] Figure 2 is a connection diagram of a composite pixel data separation circuit in a specific embodiment of the present invention;

[0023] Figure 3 It is a signal timing diagram for separation of composite pixel data;

[0024] Figure 4 is a connection relationship diagram of a discrete blind spot data composite circuit in a specific embodiment of the present invention;

[0025] Figure 5 It is a signal timing diagram of blind spot data composite. DETAILED DESCRIPTION

[0026] 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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 limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] like Figure 1 , Figure 2 As shown, the present embodiment provides a single-line multi-color LED traffic display screen control system, including a plurality of multi-color LED modules, each of which is configured with a composite pixel data separation circuit and a plurality of LED display driver modules, the composite pixel data separation circuit is configured with a data transmission line DATA and a transmission clock line RCLK, the data transmission line DATA synchronously and serially inputs multi-color composite pixel data through a single line, and the transmission clock line RCLK is used to provide a data transmission clock signal; the composite pixel data separation circuit is used to separate pixel data of different colors and output them to the outside through the corresponding monochrome pixel data output line; the plurality of LED display driver modules are all connected to a pixel clock line PCLK, and the LED display driver modules of the same color are connected in series with each other on the monochrome pixel data output line of the corresponding color.

[0029] In this example, a 5-color LED traffic display screen is used as an example. The corresponding multi-color LED module is a 5-color LED module. Five D flip-flops are serially arranged in the composite pixel data separation circuit, and the pixel data of the five colors of red, green, blue, white and yellow are separated in sequence. Figure 2 As shown in the figure, there are five monochrome pixel data output lines R, G, B, W, and Y. The clock signal end (CLK end) of each D flip-flop is connected to the transmission clock line RCLK. The output end (Q end) of each D flip-flop leads to a monochrome pixel data output line and sequentially separates pixel data of one color from the data transmission line. Figure 2 It can also be seen that the number of LED display driver modules connected in series to each monochrome pixel data output line is the same, and each LED display driver module is connected to 16 LED lamp beads.

[0030] pass Figure 3 It can be seen that the multi-color composite pixel data is serially loaded onto the data transmission line DATA in a preset order and connected to the input end (D end) of the first D flip-flop. Under the triggering of the transmission clock RCLK, the original multi-color composite data is separated one by one. Under the triggering of the pixel clock PCLK, the driving signals of the 5 LED lamp beads of different colors in the corresponding pixel points are obtained. Figure 3 Taking the serial data shown as an example, for the 0th pixel, the corresponding value of DR0DG0DB0DW0DY0 is 01010. Under the action of the transmission clock RCLK, the composite pixel data separation circuit is used to separate the 010105-bit control signal. After being triggered by the rising edge of the pixel clock PCLK, it is loaded onto the five monochrome LED display driver modules of R, G, B, W, and Y corresponding to the 0th pixel. Taking the LED display screen with a pixel array of 96*8 as an example, each module adopts a 16*8 pixel specification, and 6 modules are selected. In each module, 8 LED display driver chips of the same color are connected in series, and each chip can drive 16 lamp beads. 768 pixel clocks can be used to cover the entire LED display frequency. The multi-color composite data of a single cycle is 3840 bits, which is separated by 3840 transmission clocks, so that the driving signal of each lamp bead on each pixel can be obtained.

[0031] Furthermore, in order to realize blind spot detection of LED traffic display screen, each of the multi-color LED modules is configured with a discrete blind spot data composite circuit, and the discrete blind spot data composite circuit is configured with a data transmission line and a transmission clock line. The data transmission line outputs multi-color blind spot composite data through a single-line synchronous serial, and the transmission clock line is used to provide a data transmission clock signal; the discrete blind spot data composite circuit is configured with multiple monochrome blind spot data input lines and is used to composite blind spot data of different colors, and the multiple LED display driving modules are all connected to a pixel clock line, and the LED display driving modules of the same color are connected in series to the monochrome blind spot data input line of the corresponding color.

[0032] Taking the 5-color LED traffic display screen in this embodiment as an example, Figure 4 It can be seen that the discrete blind spot data composite circuit is provided with 5 D flip-flops in series, the clock signal end of each D flip-flop is connected to the transmission clock line, a single-color blind spot data input line is introduced into the input end of each D flip-flop, and multi-color blind spot composite data is obtained by sequentially composite from the data transmission line. Figure 4 It can be seen that the five monochrome blind spot data input lines input blind spot data of five colors, red, green, blue, white and yellow, in sequence.

[0033] Combination Figure 1 and Figure 4 It can also be seen that, in a specific implementation, the discrete blind spot data composite circuit and the composite pixel data separation circuit are connected to the same transmission clock line and pixel clock line, a plurality of multi-color LED modules are arranged in sequence, the data transmission line at the input end of the composite pixel data separation circuit of the first multi-color LED module receives the synchronous serial input of the multi-color composite pixel data, the data transmission line at the output end of the composite pixel data separation circuit of the first multi-color LED module is connected to the input end of the composite pixel data separation circuit of the second multi-color LED module as a multi-color composite pixel data loop output interface, and the connections are made in sequence, the output end of the composite pixel data separation circuit of the last multi-color LED module is connected to the input end of the corresponding discrete blind spot data composite circuit as a multi-color blind spot data composite input interface, the data transmission lines of the discrete blind spot data composite circuits of the plurality of multi-color LED modules are connected in reverse order, and finally the multi-color blind spot data composite serial output is obtained from the output end of the discrete blind spot data composite circuit of the first multi-color LED module.

[0034] According to the above system design, combined with Figure 5It can be seen that since the data lines of multiple LED display driver chips of the same color are connected in series, under the action of each pixel clock PCLK, the driving signal of each LED lamp bead of each pixel point will be fed back to the corresponding single-color blind spot data input line R, G, B, W, Y. If a lamp bead fails, when the driving signal is 1, the fed-back single-color blind spot data will become 0. Therefore, under the action of the transmission clock RCLK, the signal state of the corresponding position in the original multi-color composite pixel data will be changed. By comparing the difference between the multi-color blind spot data output by synchronous serial and the original multi-color composite pixel data, the position of the faulty lamp bead can be determined.

[0035] From the above, it can be seen that the present embodiment also discloses a single-line multi-color LED traffic display screen control method, which adopts the single-line multi-color LED traffic display screen control system described above, connects multiple multi-color LED modules in series, realizes synchronous serial input of multi-color composite pixel data through a single line, separates the multi-color composite pixel data into pixel data of different colors through the data transmission clock signal provided by the data transmission line, and then loads the pixel data of different colors into the corresponding LED display driver module through the pixel clock provided by the pixel clock line. By adopting the above system and method, composite serial input of multi-color LED pixel data can be realized through a single data line, and the system has strong scalability; at the same time, the correlation between each LED lamp bead is weak, and the circuit failure rate is low, which reduces the real-time requirements of equipment maintenance and saves maintenance costs; and it can also very conveniently realize blind spot detection, and feedback blind spot data in real time, providing a reference basis for equipment maintenance.

[0036] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A single-line multi-color LED traffic display control system, characterized in that: It comprises a plurality of multi-color LED modules, each of which is equipped with a composite pixel data separation circuit and a plurality of LED display driving modules, the composite pixel data separation circuit is equipped with a data transmission line and a transmission clock line, the data transmission line synchronously and serially inputs multi-color composite pixel data through a single line, and the transmission clock line is used to provide a data transmission clock signal; the composite pixel data separation circuit is used to separate pixel data of different colors and output them to the outside through corresponding monochrome pixel data output lines; the plurality of LED display driving modules are all connected with a pixel clock line, and the LED display driving modules of the same color are connected in series to the monochrome pixel data output lines of the corresponding colors; Each of the multi-color LED modules is configured with a discrete blind spot data composite circuit, and the discrete blind spot data composite circuit is configured with a data transmission line and a transmission clock line. The data transmission line outputs multi-color blind spot composite data through a single-line synchronous serial, and the transmission clock line is used to provide a data transmission clock signal; the discrete blind spot data composite circuit is configured with multiple monochrome blind spot data input lines and is used to composite blind spot data of different colors. The multiple LED display driving modules are all connected to a pixel clock line, and the LED display driving modules of the same color are connected in series to the monochrome blind spot data input line of the corresponding color.

2. The single-line multi-color LED traffic display screen control system according to claim 1 is characterized in that: A plurality of D flip-flops are arranged in series in the composite pixel data separation circuit, the clock signal end of each D flip-flop is connected to the transmission clock line, the output end of each D flip-flop leads to a monochrome pixel data output line and pixel data of one color is separated from the data transmission line in sequence.

3. The single-line multi-color LED traffic display screen control system according to claim 2 is characterized in that: The multi-color LED module is a five-color LED module. Five D flip-flops are arranged in series in the composite pixel data separation circuit, and pixel data of five colors, red, green, blue, white and yellow, are separated in sequence.

4. The single-line multi-color LED traffic display screen control system according to claim 3 is characterized in that: The number of LED display driver modules connected in series to each monochrome pixel data output line is the same, and each LED display driver module is connected to 16 LED lamp beads.

5. The single-line multi-color LED traffic display screen control system according to claim 1 is characterized in that: A plurality of D flip-flops are arranged in series in the discrete blind spot data composite circuit, the clock signal end of each D flip-flop is connected to the transmission clock line, a single-color blind spot data input line is introduced into the input end of each D flip-flop, and multi-color blind spot composite data is sequentially composited from the data transmission line.

6. The single-line multi-color LED traffic display screen control system according to claim 5 is characterized in that: The discrete blind spot data composite circuit is provided with 5 D flip-flops in series, and blind spot data of five colors, red, green, blue, white and yellow, are input in sequence.

7. The single-line multi-color LED traffic display screen control system according to claim 1 is characterized in that: The discrete blind spot data combination circuit and the combination pixel data separation circuit are connected to the same transmission clock line and pixel clock line.

8. The single-line multi-color LED traffic display screen control system according to claim 7 is characterized in that: A plurality of multi-color LED modules are arranged in sequence, a data transmission line at the input end of a composite pixel data separation circuit of a first multi-color LED module receives a synchronous serial input of multi-color composite pixel data, a data transmission line at the output end of the composite pixel data separation circuit of the first multi-color LED module is connected to the input end of the composite pixel data separation circuit of a second multi-color LED module as a multi-color composite pixel data loop output interface, and the modules are connected in sequence, an output end of the composite pixel data separation circuit of a last multi-color LED module is connected to the input end of a corresponding discrete blind spot data composite circuit as a multi-color blind spot data composite input interface, and data transmission lines of the discrete blind spot data composite circuits of the plurality of multi-color LED modules are connected in reverse order, and finally a multi-color blind spot data composite serial output is obtained from the output end of the discrete blind spot data composite circuit of the first multi-color LED module.

9. A single-line multi-color LED traffic display screen control method, using the single-line multi-color LED traffic display screen control system according to any one of claims 1 to 8, characterized in that: Multiple multi-color LED modules are connected in series, and synchronous serial input of multi-color composite pixel data is realized through a single line. The multi-color composite pixel data is separated into pixel data of different colors through the data transmission clock signal provided by the data transmission line, and then the pixel data of different colors are loaded into the corresponding LED display driver module through the pixel clock provided by the pixel clock line.

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