An LED screen energy-saving control system and method based on pixel value detection

Abstract

The application discloses an LED screen energy-saving control system and method based on pixel value detection, comprising a plurality of multicolor LED modules, each of which is provided with a composite pixel data separation circuit and a plurality of monochromatic driving modules, and the composite pixel data separation circuit is provided with a data transmission line and a transmission clock line; the composite pixel data separation circuit is used for separating pixel data of different colors and outputting outward through corresponding monochromatic pixel data output lines; a driving power supply and a power switch are further connected to each monochromatic driving module, and a corresponding pixel 0 value detection circuit is further connected to each monochromatic pixel data output line; when the pixel 0 value detection circuit detects that the pixel values on the current monochromatic pixel data output line are all 0 in a clock cycle, the power switch connected to the corresponding monochromatic driving module is turned off. The effect is that the circuit structure is simple, the system has strong expandability, the circuit failure rate is low, and the system energy consumption is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED control, and particularly relates to an LED screen energy-saving control system and method based on pixel value detection. BACKGROUND

[0002] In order to improve the order of motor vehicle traffic, an LED display screen is usually arranged at a traffic intersection to display some traffic prompt information, so as to combine the state of the traffic light to prompt the motor vehicle driver to drive, wait or stop.

[0003] Each pixel point in the traditional LED display screen is usually provided with only one lamp bead, and this way has a single color and limited luminous intensity, which cannot meet the actual application requirements. Chinese patent 201821721701.4 discloses an LED display unit and LED display screen, and a plurality of lamp beads are arranged at one light-emitting pixel point, so that the luminous intensity of the LED display unit can be enhanced while the uniformity of light emission is ensured. Meanwhile, Chinese patent 201811238737.1 also discloses an LED display screen and traffic information display device. It can be seen that, with the increase of the number of LED lamp beads in the device, the traditional LED driving circuit line structure is complex, and each LED driving module needs to be in a power supply state for a long time, so as to timely realize LED driving when receiving control data, but the system energy consumption is high. SUMMARY

[0004] Therefore, the first purpose of the present application is to provide an LED screen energy-saving control system based on pixel value detection, which realizes the control of the multi-color LED traffic display screen through the way of serial transmission of data by a single data transmission line, and realizes the energy-saving control of each driving module in combination with the detection of the pixel value in the transmission data.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the present application are as follows:

[0006] The application relates to an LED screen energy-saving control system based on pixel value detection, which is characterized in that a plurality of multicolor LED modules are arranged, each of the multicolor LED modules is provided with a composite pixel data separation circuit and a plurality of monochromatic driving modules, the composite pixel data separation circuit is provided with a data transmission line and a transmission clock line, the data transmission line synchronously and serially inputs multicolor composite pixel data through a single line, and the transmission clock line is used for providing a data transmission clock signal; the composite pixel data separation circuit is used for separating pixel data of different colors and outputting the pixel data to the outside through corresponding monochromatic pixel data output lines; the plurality of monochromatic driving modules are connected to the corresponding monochromatic pixel data output lines, a driving power supply and a power switch are further connected to each monochromatic driving module, and a corresponding pixel 0 value detection circuit is further connected to each monochromatic pixel data output line; when the pixel 0 value detection circuit detects that the pixel values on the current monochromatic pixel data output line are all 0 in a clock period, the power switch connected to the corresponding monochromatic driving module is turned off.

[0007] Optionally, a plurality of LED display driving chips of the same color are arranged in series in the monochromatic driving module, each of the LED display driving chips is connected to the driving power supply through the power switch, and a pixel clock line is further connected to each of the LED display driving chips.

[0008] Optionally, a plurality of D flip-flops are arranged in series in the composite pixel data separation circuit, a clock signal end of each of the D flip-flops is connected to the transmission clock line, and each of the D flip-flops has a monochromatic pixel data output line led out from an output end and sequentially separates pixel data of one color from the data transmission line.

[0009] Optionally, the multicolor LED module is a 5-color LED module, five D flip-flops are arranged in series in the composite pixel data separation circuit, and pixel data of five colors of red, green, blue, white and yellow are sequentially separated.

[0010] Optionally, the number of LED display driving chips arranged in series in each monochromatic driving module is the same, and each of the LED display driving chips is connected to 16 LED lamp beads.

[0011] Optionally, the pixel 0 value detection circuit comprises a D flip-flop, a monostable trigger and an RS flip-flop, monochrome pixel data output on the monochrome pixel data output line is input to the S end of the RS flip-flop, the output end of the monostable trigger is connected with the R end of the RS flip-flop, the output end of the RS flip-flop is connected with the D port of the D flip-flop, a driving chip latch signal is input in the pixel 0 value detection circuit, the driving chip latch signal is connected with the CLK end of the D flip-flop through a NOT gate circuit, the driving chip latch signal is also connected with the A input end of the monostable trigger, and the output end of the D flip-flop is connected on the B input end of the monostable trigger, and a driving signal corresponding to a power switch is output by the output end of the D flip-flop.

[0012] Optionally, the pixel 0 value detection circuit is further provided with a single screen clear module, and the single screen clear module is used for generating a single screen clear signal according to a single screen display lock screen signal.

[0013] Optionally, the monochrome driving modules of different colors are connected with different monochrome driving power modules respectively, and the plurality of monochrome driving power modules are input on a total power input line.

[0014] Optionally, the 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 multi-color composite pixel data synchronous serial input, and the data transmission line at the output end of the composite pixel data separation circuit of the previous multi-color LED module is connected with the input end of the composite pixel data separation circuit of the next multi-color LED module as a multi-color composite pixel data ring output interface.

[0015] Based on the above system, the application further provides an LED screen energy-saving control method based on pixel value detection, which adopts the LED screen energy-saving control system based on pixel value detection described above, and the key lies in that the plurality of multi-color LED modules are connected in series, multi-color composite pixel data synchronous serial input is realized through a single line, different color pixel data is obtained by separating the multi-color composite pixel data through a data transmission clock signal provided by the data transmission line, then the different color pixel data is loaded into corresponding monochrome driving modules through a pixel clock provided by a pixel clock line, whether all the color pixel data is 0 in a clock cycle is counted through a pixel 0 value detection circuit, if all the color pixel data is 0, the power switch connected with the corresponding monochrome driving module is turned off.

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

[0017] 1. The circuit structure is simple, installation is convenient, single line multi-color separation technology is adopted, multi-color LED pixel data composite serial input can be realized through a single data line, and the system has strong expandability;

[0018] 2. The correlation between each LED lamp bead is weak, the circuit failure rate is low, the real-time requirement of equipment maintenance is reduced, and the maintenance cost is saved;

[0019] 3. Energy-saving control is facilitated, power management of the LED driving module can be realized based on detection of pixel values, the principle of not consuming power when not lighting is adopted, and the demand for energy input and the requirement for energy storage configuration are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

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

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

[0024] Figure 4 is a connection relationship diagram of a pixel 0 value detection circuit in a specific embodiment of the present application;

[0025] Figure 5 is a connection relationship diagram of a pixel 0 value detection circuit provided with a single screen clear module;

[0026] Figure 6 is a circuit principle diagram of a pixel 0 value detection circuit;

[0027] Figure 7 is an implementation timing diagram of pixel 0 value detection. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0030] As Figure 1 , Figure 2 shown, the LED screen energy-saving control system based on pixel value detection provided by the embodiment comprises a plurality of multi-color LED modules, each of which is provided with a composite pixel data separation circuit and a plurality of single-color driving modules, the composite pixel data separation circuit is provided with a data transmission line DATA and a transmission clock line RCLK, the data transmission line DATA inputs multi-color composite pixel data through single-line synchronous serial, 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 outward through corresponding single-color pixel data output lines; the plurality of single-color driving modules are respectively connected to the corresponding single-color pixel data output lines, a plurality of LED display driving chips of the same color are arranged in series in the single-color driving module, each of the LED display driving chips is connected to the driving power source through the power switch, and each of the LED display driving chips is connected to a pixel clock line PCLK.

[0031] In this example, a 5-color LED traffic display screen is taken as an example, the corresponding multi-color LED module is a 5-color LED module, five D flip-flops are arranged in series in the composite pixel data separation circuit, and pixel data of five colors of red, green, blue, white and yellow are sequentially separated out, corresponding to five single-color pixel data output lines R, G, B, W and Y shown in Figure 2 The clock signal end (CLK end) of each D flip-flop is connected to the transmission clock line RCLK, and the output end (Q end) of each D flip-flop leads out a single-color pixel data output line and sequentially separates out pixel data of one color from the data transmission line. Figure 2 It can also be seen that the number of LED display driving chips connected in series to each single-color pixel data output line is the same, and each LED display driving chip is connected to 16 LED lamp beads.

[0032] Through Figure 3As can be seen, the multi-color composite pixel data is loaded in series on the data transmission line DATA and accessed to the input end (D end) of the first D flip-flop in the preset order. Under the trigger of the transmission clock RCLK, the original multi-color composite data is separated one by one. Under the trigger of the pixel clock PCLK, the driving signals of the 5 LED lamp beads of different colors in the corresponding pixel points are obtained, so as to Figure 3 As an example of the serial data shown, for the 0th pixel point, the values of DR0DG0DB0DW0DY0 are 01010. Under the action of the transmission clock RCLK, 5 bits of control signals of 01010 are obtained by the composite pixel data separation circuit. After the rising edge of the pixel clock PCLK is triggered, the control signals are loaded on the R, G, B, W and Y single-color driving modules corresponding to the 0th pixel point. Taking an LED display screen with a pixel array of 96*8 as an example, each module adopts a pixel specification of 16*8, 6 modules are selected, and 8 pieces of LED display driving chips of the same color are connected in series in each module. Each piece can drive 16 lamp beads. 768 pixel clocks are used to cover the entire LED display screen. The multi-color composite data in a single period is 3840 bits, which is separated by 3840 transmission clocks, so that the driving signals of each lamp bead on each pixel point can be obtained.

[0033] In combination with Figure 4 As can be seen, in order to realize the energy-saving control of the LED screen, a driving power supply and a power switch are further connected to each single-color driving module. A pixel 0 value detection circuit is further connected to each single-color pixel data output line. When the pixel 0 value detection circuit detects that the pixel values on the current single-color pixel data output line are all 0 in a clock period, the power switch connected to the corresponding single-color driving module is turned off.

[0034] In combination with Figure 5 and Figure 6 As can be seen, the pixel 0 value detection circuit includes a D flip-flop, a monostable trigger and an RS flip-flop. The single-color pixel data output from the single-color pixel data output line is sent to the S end of the RS flip-flop. The output end of the monostable trigger is connected to the R end of the RS flip-flop. The output end of the RS flip-flop is connected to the D port of the D flip-flop. A driving chip latch signal is accessed in the pixel 0 value detection circuit. The driving chip latch signal is connected to the CLK end of the D flip-flop through an NOT gate circuit. The driving chip latch signal is also connected to the A input end of the monostable trigger. The output end of the D flip-flop is connected to the B input end of the monostable trigger. At the same time, the driving signal of the corresponding power switch is output from the output end of the D flip-flop. A single screen clear module is further provided in the pixel 0 value detection circuit. The single screen clear module is used to generate a single screen clear signal according to a single screen display lock screen signal.

[0035] In the implementation process, different monochrome driving modules of different colors are connected to different monochrome driving power modules according to different power requirements, and the plurality of monochrome driving power modules are connected to the total power input line.

[0036] In order to facilitate expansion, a plurality of multi-color LED modules are arranged in sequence, a data transmission line at an input end of a composite pixel data separation circuit of a first multi-color LED module receives synchronous serial input of multi-color composite pixel data, and a data transmission line at an output end of a composite pixel data separation circuit of a previous multi-color LED module is connected to an input end of a composite pixel data separation circuit of a next multi-color LED module as a multi-color composite pixel data ring output interface.

[0037] In combination Figure 7 As can be seen, PCLK in the figure is a pixel clock, DATA is monochrome pixel data, such as Figure 1 R, G, B, Y, W in the figure, LAT is an LED driving chip latch signal, PWEN is a monochrome power switch, when the pixel data is all '0' in a period, the power of the color is turned off, and vice versa.

[0038] In addition, the embodiment also proposes an LED screen energy-saving control method based on pixel value detection, adopts the LED screen energy-saving control system based on pixel value detection described in the foregoing, connects a plurality of 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 a data transmission clock signal provided by a data transmission line, then loads the pixel data of different colors into corresponding monochrome driving modules through a pixel clock provided by a pixel clock line, and counts whether the pixel data of each color is all '0' in a clock period through a pixel 0 value detection circuit, if all the pixel data of each color is '0', the power switch connected to the corresponding monochrome driving module is turned off.

[0039] As can be seen, the power-saving scheme described in the embodiment works in units of monochrome pixel modules, adopts the principle of no power consumption when not lighting, and determines whether to turn on the driving power by detecting whether all the pixel values of the color are not lit (0 value). Specifically, when performing full-screen display once, if all the pixel values of the color are '0', the circuit hardware automatically turns off the driving power, thereby reducing power consumption. On the contrary, if there is only one pixel lit, the driving power of the module of the color is turned on, and the normal display of the color is maintained. By adopting the technical scheme, the maximum power saving in a 5-color LED display screen system can reach more than 60%, greatly reducing the demand for energy input and energy storage configuration requirements, and further reducing the comprehensive cost and core competitiveness of the product.

[0040] In combination Figures 4-7The power saving implementation principle of the application can be understood in detail. When a color pixel value enters the module, the pixel statistical module detects the value on the data line for statistics. The statistical interval is the full closed interval delimited by two screen latch signals. When no '1' appears in the pixel value in the interval, that is, all are '0', the zero value statistical signal outputs '0' to the power saving control signal buffer module, otherwise, outputs '1'. After completing the display setting of a screen pixel, the control system outputs a single screen display latch signal. At this time, the power saving control signal buffer module outputs the driving power control signal, which is disconnected or connected according to the zero value statistical signal. At the same time, the single screen latch signal outputs a single screen zero signal, which resets the zero pixel 0 value statistical module output, and waits for the next pixel 0 value statistics. Finally, in the case of single line multi-color data transmission, the LED screen energy saving control based on pixel value detection is realized. The system has strong expansibility, the correlation between the LED lamp beads is weak, the circuit failure rate is low, the real-time requirement of equipment maintenance is reduced, the maintenance cost is saved, and the energy consumption is effectively reduced.

[0041] The above only discloses a preferred embodiment of the application, of course, cannot limit the scope of the application, those skilled in the art can understand that all or part of the above-mentioned embodiment can be implemented, and equivalent changes made according to the claims of the application still belong to the scope of the application.

Claims

1. An LED screen energy-saving control system based on pixel value detection, characterized in that, The application relates to a multi-color LED module, which comprises a plurality of multi-color LED modules, each of which is provided with a composite pixel data separation circuit and a plurality of single-color driving modules, the composite pixel data separation circuit is provided 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 for providing a data transmission clock signal; the composite pixel data separation circuit is used for separating pixel data of different colors and externally outputting the pixel data through corresponding single-color pixel data output lines; the plurality of single-color driving modules are respectively connected to the corresponding single-color pixel data output lines, a driving power supply and a power switch are further connected to each single-color driving module, and a corresponding pixel 0 value detection circuit is further connected to each single-color pixel data output line; when the pixel 0 value detection circuit detects that the pixel values on the current single-color pixel data output line are all 0 in a clock period, the power switch connected to the corresponding single-color driving module is turned off. A plurality of LED display driving chips of the same color are connected in series in the single-color driving module, each of the LED display driving chips is connected to the driving power supply through the power switch, and a pixel clock line is connected to each of the LED display driving chips. A plurality of D flip-flops are connected 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, and the output end of each D flip-flop leads to a single-color pixel data output line and sequentially separates pixel data of one color from the data transmission line. The plurality of multi-color LED modules are connected in series, multi-color composite pixel data is synchronously and serially input through a single line, different-color pixel data is separated from the multi-color composite pixel data through a data transmission clock signal provided by the data transmission line, and then the different-color pixel data is loaded into corresponding single-color driving modules through a pixel clock provided by the pixel clock line.

2. The LED screen energy saving control system based on pixel value detection according to claim 1, characterized in that, The multi-color LED module is a 5-color LED module, five D flip-flops are connected in series in the composite pixel data separation circuit, and pixel data of five colors of red, green, blue, white and yellow are sequentially separated.

3. The LED screen energy saving control system based on pixel value detection according to claim 1, characterized in that, The number of LED display driving chips connected in series in each single-color driving module is the same, and each of the LED display driving chips is connected to 16 LED lamp beads.

4. The LED screen energy-saving control system based on pixel value detection according to any one of claims 1-3, characterized in that, The pixel 0 value detection circuit comprises a D flip-flop, a monostable trigger and an RS trigger, single-color pixel data output from the single-color pixel data output line is input into the S end of the RS trigger, the output end of the monostable trigger is connected to the R end of the RS trigger, the output end of the RS trigger is connected to the D port of the D flip-flop, a driving chip latch signal is input into the pixel 0 value detection circuit, the driving chip latch signal is connected to the CLK end of the D flip-flop through a NOT gate circuit, the driving chip latch signal is also connected to the A input end of the monostable trigger, the output end of the D flip-flop is connected to the B input end of the monostable trigger, and a driving signal of a corresponding power switch is output from the output end of the D flip-flop.

5. The LED screen energy saving control system based on pixel value detection according to claim 4, characterized in that, The pixel 0 value detection circuit is also provided with a single screen clear module, which is used for generating a single screen clear signal according to a single screen display lock screen signal.

6. The LED screen energy saving control system based on pixel value detection according to claim 4, characterized in that, The single-color driving modules of different colors are connected to different single-color driving power supply modules, and the multiple single-color driving power supply modules are connected to a total power input line.

7. The LED screen energy saving control system based on pixel value detection according to claim 6, characterized in that, The multiple multi-color LED modules are arranged in sequence, a data transmission line at an input end of the composite pixel data separation circuit of the first multi-color LED module receives multi-color composite pixel data synchronous serial input, and a data transmission line at an output end of the composite pixel data separation circuit of a previous multi-color LED module is connected to an input end of the composite pixel data separation circuit of a next multi-color LED module as a multi-color composite pixel data ring output interface.

8. The LED screen energy-saving control method based on pixel value detection, using the LED screen energy-saving control system based on pixel value detection of any one of claims 1-7, characterized in that, The multiple multi-color LED modules are connected in series, multi-color composite pixel data synchronous serial input is realized through a single line, different color pixel data is separated from the multi-color composite pixel data through a data transmission clock signal provided by a data transmission line, then the different color pixel data is loaded into corresponding single-color driving modules through a pixel clock provided by a pixel clock line, and the pixel 0 value detection circuit is used to count whether all color pixel data is 0 in a clock cycle, if all color pixel data is 0, then a power switch connected to the corresponding single-color driving module is turned off.

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