Domestic full-color LED display screen based on GD32

Abstract

A domestic full-color LED display screen based on GD32 comprises a power module which supplies power to a row driving module and a column driving module. The receiving ends of the row driving module and the column driving module are connected with the transceiving circuit module, and the output ends are connected with the display module; and a cascade module is arranged between the row driving module and the column driving module. The utility model has the following beneficial effects: 1, the colorful fog-shaped common-anode SMD light-emitting diode has obvious advantages instead of the traditional LED, is rich and soft in light color, small in physical property, energy-saving and shock-resistant, is adaptive to multiple scenes at a 5mm interval, is easy to install, resists impact and is high in cost performance; the colorful fog-shaped common-anode SMD light-emitting diode is high in cost performance; 2, a row driving circuit selects an RUC7258D chip, an integrated circuit eliminates smear and improves the refresh rate, output is flexible, and built-in protection improves stability and adaptability; and 3, the column driving circuit selects RUL6024, I / O anti-interference, 30MHz transmission and wide temperature and wide voltage application are realized, the functions of improving lamp beads and the like are realized, and the refresh rate is increased by double latches.

Description

Technical Field

[0001] This utility model relates to a domestically produced full-color LED display screen based on GD32. Background Technology

[0002] In the field of display technology, traditional full-color LED displays typically rely on imported microcontrollers (such as the STM32 series) or dedicated ASIC chips as the core controller, achieving color display by driving the brightness combination of red (R), green (G), and blue (B) primary color LED beads. In existing technologies, LED display control mostly adopts a fixed scanning frequency and static PWM dimming method, refreshing pixel data by scanning line by line.

[0003] In the development of full-color LED display technology, there are significant shortcomings in hardware. LED chips have low luminous efficiency, limited packaging technology, and poor color consistency. Driver chips have limited functionality and low integration, increasing costs and system instability. The display effect is poor, with low resolution, narrow color gamut, few grayscale levels, and low refresh rate. In addition, power consumption is high, and there is no scalability, making it difficult to present high-quality images. The control technology is simple, mostly using serial communication, resulting in poor system stability and a lack of intelligent control functions, making it difficult to meet the needs of real-time data transmission and convenient maintenance. Due to these factors, its application scope is limited, mainly used in outdoor advertising and simple information display scenarios where display effect requirements are not high, and it is difficult to enter indoor commercial displays and home theaters, which have high image quality requirements. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the problems of high power consumption, low scalability, unstable image, and single color display. A domestic full-color LED display based on GD32 microcontroller uses domestic driver chip to achieve low power consumption and high refresh rate, high color performance, supports modular cascading and dual control mode to enhance scalability, and has significant advantages in energy efficiency, image quality and scalability.

[0005] To solve the above problems, this utility model is achieved through the following technical solution:

[0006] A domestically produced full-color LED display screen based on GD32 includes a power supply module that supplies power to a row drive module and a column drive module; the receiving ends of the row drive module and the column drive module are both connected to a transceiver circuit module, and their output ends are connected to a display module.

[0007] A cascade module is provided between the row-driven module and the column-driven module.

[0008] The display module uses colorful, fog-like common-anode surface-mount LEDs.

[0009] The spacing between adjacent multicolored common anode surface-mount LEDs is 5mm.

[0010] The row drive circuit includes two row drive chips RUC7258D connected in parallel.

[0011] The column driver module consists of several column driver chips RUL6024 connected in series.

[0012] The controller module includes a microcontroller and a WIFI module and a USB flash drive read / write module connected to the microcontroller.

[0013] The microcontroller uses the GD32F4 series chip.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The seven-color mist-like common anode surface-mount LED has significant advantages over the traditional type. It emits seven rich and soft colors, has small physical characteristics, is energy-saving and shock-resistant, and its 5mm pitch is suitable for multiple scenarios. It is easy to install, impact-resistant, and cost-effective.

[0016] 2. The horizontal drive circuit uses the RUC7258D chip, which is an integrated circuit that eliminates ghosting, improves refresh rate, provides flexible output, and has built-in protection to enhance stability and adaptability.

[0017] 3. The column drive circuit uses RUL6024, which has I / O anti-interference, 30MHz transmission, wide temperature and voltage range, and functions to improve LED chips, and dual latches to improve refresh rate.

[0018] 4. The NW245B chip is selected as a signal buffer in the transceiver circuit and cascade module, which greatly improves the signal stability. The cascaded row and column drive can realize different resolutions and ensure the LED screen display.

[0019] 5. The controller uses the domestic GD32F4 as the main control chip, which has strong performance, low power consumption, and supports USB flash drive and network control. It has a wide range of applications and can flexibly control full-color LED display screens. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the present invention;

[0021] Figure 2 This is the schematic diagram of the display module;

[0022] Figure 3 This is the schematic diagram of the row driver module;

[0023] Figure 4 This is the schematic diagram of the column driver module;

[0024] Figure 5 This is the schematic diagram of the transceiver circuit and cascaded modules;

[0025] Figure 6This is the schematic diagram of the controller module. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figure 1 , Figure 2 As shown, a domestically produced full-color LED display screen based on GD32 includes a power supply module that supplies power to the row drive module and the column drive module; the receiving ends of the row drive module and the column drive module are both connected to the transceiver circuit module, and their output ends are connected to the display module.

[0029] Furthermore, a cascade module is provided between the row driving module and the column driving module.

[0030] The design of each subsystem is described below:

[0031] 1) Display module hardware design

[0032] To effectively achieve full-color LED displays, besides using a large number of RGB light-emitting diodes (LEDs), the selection and spacing of the LED chips are crucial. Chip selection requires consideration of multiple factors. High-efficiency chips reduce power consumption and increase brightness, while new chip technologies and packaging processes improve efficiency. Regarding color consistency, the color deviation of each chip must be controlled to a minimum to ensure uniform and realistic screen colors. For reliability and lifespan, the chips must possess good anti-static, high-temperature, and moisture resistance properties; products with rigorous quality inspection and high protection levels should be selected. The pixel pitch (or dot pitch) significantly impacts display quality; smaller pitch results in higher pixel density and a clearer, more detailed display.

[0033] like Figure 2As shown, the display module of this utility model uses a seven-color frosted common-anode surface-mount LED, which has advantages far exceeding those of traditional LEDs. Traditional LEDs can only emit a single color, resulting in a monotonous display, while this module can emit seven colors, enabling rich color switching and combinations for a stunning visual effect. In commercial displays, it can quickly change colors according to promotional themes and product characteristics, attracting customers and creating a shopping atmosphere; in stage performances, it can dynamically change colors in sync with the rhythm, delivering a visual feast. Its frosted encapsulation scatters light, producing uniform and soft light, reducing glare and preventing eye strain and vision loss. Whether used for indoor lighting to create a warm environment or as a backlight for electronic devices to protect the eyes, it performs excellently.

[0034] Ideally, the spacing between adjacent multi-colored common-anode surface-mount LEDs is 5mm. Optically, this provides a suitable emission angle and good brightness, uniform light coverage, and excellent color performance, meeting the needs of various indoor and outdoor scenarios. Mechanically, it facilitates installation, improves production efficiency, and offers some impact resistance, extending service life. Cost-effectively, the manufacturing process is simple, raw material costs are low, and the price is affordable, making it suitable for cost-sensitive scenarios, meeting requirements and improving cost-effectiveness.

[0035] The display module is divided into upper and lower parts and uses a 1 / 16 scan driving method. In terms of cost, it can significantly reduce the number of driver chips, reduce PCB board complexity and design and manufacturing costs, improve production efficiency and reduce defect rate. In terms of power consumption, instantaneous power consumption is significantly reduced, saving electricity, reducing heat loss, and also reducing heat dissipation requirements, costs and maintenance difficulty, which helps to extend the life of the display screen. In terms of display performance, it can meet the basic display requirements of small-sized screens, clearly presenting text and simple graphics. With reasonable design, a certain refresh rate can be guaranteed and flicker can be reduced. During installation and maintenance, due to the simple driver circuit, installation is convenient, which can reduce complexity and difficulty, shorten time and improve efficiency. Moreover, fault diagnosis and repair are easy, which can quickly locate problems and reduce costs.

[0036] 2) Row drive module

[0037] The RUC7258D was chosen as the row driver chip for the column driver circuit. The RUC7258D integrates a 3 / 8 decoder and a constant charge absorption circuit, a unique design that provides strong support for solving common display problems. In traditional LED dot matrix displays, ghosting is a troublesome issue, causing blurred images and unclear information display, severely impacting the visual experience. The RUC7258D's 3 / 8 decoder accurately decodes and controls the row signals, ensuring that the LEDs in each row are accurately lit and turned off according to the predetermined time and sequence. Simultaneously, the constant charge absorption circuit effectively absorbs excess charge, preventing ghosting caused by charge accumulation. Furthermore, during long-term use, LEDs may experience leakage or short circuits, leading to the so-called "caterpillar effect," i.e., irregular bright or dark spots on the display, affecting the overall aesthetics. The RUC7258D's constant charge absorption circuit can monitor and handle these anomalies in real time, promptly correcting the effects of leakage or short circuits, ensuring a clear and uniform image on the display.

[0038] Refresh rate is a crucial indicator of display quality; a higher refresh rate results in smoother visuals and reduces flicker. The RUC7258D excels in improving refresh rate. Its meticulously optimized internal circuitry enables rapid response to control signals, achieving high-speed driving of the LED chips. This allows the display to refresh multiple times in a short period, effectively enhancing the dynamic display effect and ensuring clarity and smoothness even when displaying rapidly changing images or videos.

[0039] Even better, the horizontal drive circuit includes two parallel-connected horizontal drive chips, RUC7258D. The RUC7258D also incorporates short-circuit and overcurrent protection circuits, which play a crucial role in improving the product's adaptability and stability. In actual use, the display screen may face various complex environments and unexpected situations, such as short circuits and excessive current. If these abnormalities are not handled promptly, they may damage the drive chip or even the entire display screen. The short-circuit protection circuit can quickly cut off the power supply when a short circuit is detected, preventing excessive current from damaging the chip. The overcurrent protection circuit can monitor the current magnitude in real time, and automatically adjust the output current when the current exceeds the safe range, ensuring that the chip and display screen operate in a safe current environment. Through the synergistic effect of these two protection circuits, the RUC7258D can effectively cope with various emergencies, improving the product's adaptability and stability in different environments, and reducing maintenance costs and downtime caused by failures. Decoupling capacitors also contribute to the chip's reliability.

[0040] 3) Column drive module

[0041] In the field of LED display technology, the performance of the column driver circuit plays a crucial role in the display effect. After extensive market research and practical application verification, the careful selection of the RUL6024 as the column driver chip has yielded significant benefits, demonstrating its superior performance in all aspects.

[0042] The column driver module comprises several RUL6024 column driver chips connected in series. The RUL6024 features 16 channels of constant current sink output, a feature that greatly simplifies the design of LED display systems. In large-scale LED display arrays, precise current control of numerous LEDs is required to ensure they emit light correctly. The 16-channel design allows multiple LEDs to be driven simultaneously on a single chip, reducing the number of chips used and lowering circuit complexity and cost. Furthermore, its output current range is flexibly adjustable across different operating voltages (3.3V - 5V). Different types of LEDs have varying current requirements; for example, some high-brightness LEDs may require a larger current to achieve the desired lighting effect, while smaller indicator LEDs require less current. This adjustable feature of the RUL6024 allows it to meet diverse LED display needs, easily handling everything from small digital display devices to large outdoor LED displays. In LED displays, luminous uniformity and display stability are crucial indicators for evaluating display performance. The RUL6024 excels in this regard, strictly controlling the inter-channel and inter-chip current accuracy errors to within ±2.0% and ±3.0%, respectively. In a display unit composed of multiple LED chips, inconsistent current across channels can lead to varying brightness levels among LEDs in different locations, resulting in uneven display. The RUL6024, through precise current control, ensures a stable and consistent current supply to each LED, resulting in uniform illumination across the entire display without noticeable brightness differences. Even when using multiple RUL6024 chips to form a larger-scale display system, the inter-chip current accuracy error remains effectively controlled, further guaranteeing display stability and consistency.

[0043] In applications requiring rapidly changing display content, such as dynamic advertising displays and video playback, the dynamic performance of display devices is crucial. The RUL6024 features a fast output current response, with a minimum OE of 40ns (when VDD = 5V). This means that when the LED's illumination state needs to be changed, the chip can adjust the current in a very short time, achieving rapid on / off switching. Compared to some slower driver chips, the RUL6024 can display dynamic images more clearly and smoothly, avoiding ghosting and flickering, significantly improving the display's dynamic performance.

[0044] The RUL6024 integrates dual latch registers, a design that allows it to achieve a refresh rate more than 50% higher than general-purpose constant current source chips. A high refresh rate results in smoother, more detailed images, reduces flicker, and enhances the user's visual experience. In applications with high display quality requirements, such as high-end indoor displays and professional surveillance displays, the advantages of a high refresh rate are particularly evident. Whether displaying static images or dynamic videos, the RUL6024 delivers clear and stable visuals to the user.

[0045] 4) Transceiver circuit module and cascade module

[0046] This module includes transceiver circuitry and cascaded module design. In today's complex and diverse field of electronic devices, the efficiency and stability of signal processing and transmission are among the key indicators for measuring device performance.

[0047] This design provides great flexibility for signal processing and transmission. The term "eight-channel signal" means it can process and transmit up to eight signals simultaneously, which is especially important in systems requiring multi-channel data transmission. For example, in complex sensor networks, it may be necessary to simultaneously acquire and transmit data from multiple sensors. The MW245B's eight-channel signal processing capability can meet the needs of such multi-channel data transmission, greatly improving the system's data processing efficiency.

[0048] Its unique tri-state output capability further enhances its application value in circuits. The tri-state output includes three states: high level, low level, and high impedance. The presence of the high impedance state allows the MW245B to isolate the output terminal from the circuit when no output signal is needed, avoiding interference to other circuit components. This is very useful in systems requiring bus sharing, where multiple devices can share the same bus. By controlling the output state of the MW245B, it can output a valid signal when data transmission is needed and enter a high impedance state when not needed, thus achieving efficient utilization of bus resources.

[0049] The MW245B has two important control terminals: OE and DIR, each performing key control functions. DIR, as the data flow control terminal, plays a crucial role in precisely controlling the direction of data transmission. When DIR is high, the data flow is from A to B; when DIR is low, the data flow is from B to A. This flexible data flow control capability allows the MW245B to easily adjust the data transmission direction according to different application requirements. In a bidirectional communication system, data may need to be transmitted bidirectionally between two different devices. By controlling the level of DIR, the back-and-forth transmission of data between these two devices can be easily achieved without the need for additional complex circuitry to switch the data flow direction.

[0050] As the output status control terminal, OE plays a crucial role in data transmission. When OE is high, the output is in a high-impedance state, disconnecting the MW245B's output from external circuits and preventing any impact. This high-impedance state effectively avoids signal conflicts and interference that may occur under certain conditions. When OE is low, data can be transmitted normally. The MW245B will accurately transmit the input signal to the output terminal according to the data flow direction set by DIR. By properly controlling the OE level, precise control of data transmission can be achieved, ensuring data is transmitted at the appropriate time and under suitable conditions.

[0051] The HB75 interface is selected for both signal input and output. The signal input of the cascade interface is connected to the cascade output of the row and column drive circuit, thus enabling display screens with different resolutions. The HB75 interface, as a commonly used signal input interface for LED displays, provides crucial support for stable operation and high-quality display effects. In terms of electrical performance, it employs parallel transmission, enabling fast and stable transmission of image data to each pixel, reducing latency and data loss, ensuring stable and continuous image display, and possessing strong driving capability to ensure uniform brightness of LED beads in large-scale displays.

[0052] 5) Controller module

[0053] To achieve efficient, stable, and flexible control of the full-color LED display screen, this module, after careful consideration and multiple rounds of comparative evaluation, ultimately selected the domestically produced GD32F4 series microcontroller as the main control chip. It also supports USB flash drive control and network control of the full-color LED display screen. Specifically, the controller module includes the microcontroller, a WIFI module connected to the microcontroller, and a USB flash drive read / write module.

[0054] The microcontroller uses the GD32F425 microcontroller with an ARM Cortex-M4 core as the main control chip. This domestically produced chip provides powerful computing power with a 200MHz main frequency, enabling efficient processing of complex display data and smooth LED screen control. As the latest upgrade of the GD32F4 series, the GD32F425 maintains its original high-performance characteristics while further optimizing graphics processing capabilities and energy efficiency, providing a more reliable domestic core solution for full-color LED display systems. Simultaneously, this series of chips integrates large-capacity Flash and SRAM, easily storing the images, videos, and other data required for display, as well as running complex control algorithms. Furthermore, the GD32F425 chip features low power consumption, effectively reducing overall system energy consumption, extending equipment lifespan, and lowering operating costs. Moreover, domestically produced chips have unique advantages in supply stability and technical support, better meeting the domestic market's demand for self-sufficiency, controllability, and rapid response.

[0055] The GD32F4 series chips integrate a USB peripheral controller, supporting the USB 2.0 specification and providing full-speed (12Mbps) communication capabilities. Its USB module integrates hardware units such as transceivers and endpoint controllers, and with corresponding software drivers, facilitates data transfer between USB devices and the host. In USB flash drive control scenarios, the GD32F4 chip acts as the USB host, communicating with the USB flash drive. To facilitate rapid updates and display of local content, this USB flash drive read / write module supports various common image formats (such as JPEG and PNG) and converts them into data formats suitable for full-color LED displays. Users can also flexibly set parameters such as the playback order and display effects of displayed content through configuration files within the USB flash drive, achieving personalized display needs. This USB flash drive read / write module requires no complex network connections or settings, is simple and convenient to operate, and is suitable for various temporary events and localized information display scenarios.

[0056] In the full-color LED display screen control system, the ESP8266-01S is selected as the Wi-Fi module for networking. Combined with the GD32F4 series main control chip, it enables convenient and efficient network control. The ESP8266-01S has powerful Wi-Fi communication capabilities, allowing the system to easily connect to the network and communicate with remote servers or mobile devices, thereby enabling flexible control of the full-color LED display screen. The ESP8266-01S is used to control the LED display screen. The ESP8266-01S requires a 3.3V power supply, and the LED screen is powered according to specifications. For connection, the TX and RX pins of the ESP8266-01S are connected to the RX and TX pins of the LED display driver board via serial communication, ensuring proper connection of the positive and negative power supplies for both. The workflow is as follows: After powering on, the ESP8266-01S initializes and searches for Wi-Fi networks. After user configuration, it connects to the designated router to access the Internet. Control commands can be sent from a mobile APP, computer software, or cloud server. The ESP8266-01S receives and parses the commands, converts the content into a format suitable for LED screen driving, and then sends it to the driver board via serial port. The driver board controls the LED beads to turn on and off, change color, and adjust brightness according to the received data, so that the screen displays display effects such as scrolling text and flashing patterns that meet the command requirements.

[0057] The beneficial effects of this utility model are as follows:

[0058] 1. The seven-color mist-like common anode surface-mount LED has significant advantages over the traditional type. It emits seven rich and soft colors, has small physical characteristics, is energy-saving and shock-resistant, and its 5mm pitch is suitable for multiple scenarios. It is easy to install, impact-resistant, and cost-effective.

[0059] 2. The horizontal drive circuit uses the RUC7258D chip, which is an integrated circuit that eliminates ghosting, improves refresh rate, provides flexible output, and has built-in protection to enhance stability and adaptability.

[0060] 3. The column drive circuit uses RUL6024, which has I / O anti-interference, 30MHz transmission, wide temperature and voltage range, and functions to improve LED chips, and dual latches to improve refresh rate.

[0061] 4. The NW245B chip is selected as a signal buffer in the transceiver circuit and cascade module, which greatly improves the signal stability. The cascaded row and column drive can realize different resolutions and ensure the LED screen display.

[0062] 5. The controller uses the domestic GD32F4 as the main control chip, which has strong performance, low power consumption, and supports USB flash drive and network control. It has a wide range of applications and can flexibly control full-color LED display screens.

[0063] This invention proposes novel design concepts for display circuit design, row drive circuit, column drive circuit, circuit board power supply, transceiver circuit design, cascaded circuit, and controller module design. The solution has been validated through multiple rounds of technical trials, demonstrating its effectiveness and practical engineering value. The use of multi-color, foggy common-anode surface-mount LEDs not only provides rich and uniform light emission but also offers advantages such as compact size, energy efficiency, and good shock resistance. The 5mm pitch ensures excellent optical and mechanical performance while maintaining low cost and high cost-effectiveness. In the row drive circuit, integrated circuitry eliminates malfunctions and improves refresh rate, offering flexible usage, built-in protection circuitry, and good package compatibility. The column drive circuit features 16 channels of constant current sinking output, providing flexible current range, high precision, fast response, strong anti-interference, high transmission frequency, and a wide operating range. It offers various practical functions, significantly improves refresh rate, and is suitable for diverse display scenarios. Reliable bidirectional data transmission control is provided, enhancing system data processing and transmission efficiency, while also increasing system flexibility and scalability, thus improving drive performance and optimizing data transmission management. It also provides a cascading function to achieve different resolutions.

[0064] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A domestically produced full-color LED display screen based on GD32, characterized in that: It includes a power module that supplies power to the row drive module and the column drive module; the receiving ends of the row drive module and the column drive module are both connected to the transceiver circuit module, and their output ends are connected to the display module. A cascade module is provided between the row-driven module and the column-driven module.

2. The domestically produced full-color LED display screen based on GD32 according to claim 1, characterized in that: The display module uses colorful, fog-like common-anode surface-mount LEDs.

3. A domestically produced full-color LED display screen based on GD32 according to claim 2, characterized in that: The spacing between adjacent multicolored common anode surface-mount LEDs is 5mm.

4. A domestically produced full-color LED display screen based on GD32 according to claim 1, characterized in that: The row drive circuit includes two row drive chips RUC7258D connected in parallel.

5. A domestically produced full-color LED display screen based on GD32 according to claim 1, characterized in that: The column driver module consists of several column driver chips RUL6024 connected in series.

6. A domestically produced full-color LED display screen based on GD32 according to claim 1, characterized in that: The controller module includes a microcontroller and a WIFI module and a USB flash drive read / write module connected to the microcontroller.

7. A domestically produced full-color LED display screen based on GD32 according to claim 6, characterized in that: The microcontroller uses the GD32F4 series chip.

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