Design of LED Display Screen Based on a Modularization

LED large screen display has been more and more used in advertising, information release, traffic instructions and other public places because of its eye-catching and flexible content. LED display is mainly divided into digital display and dot matrix display. This paper only discusses dot matrix display. At present, the requirements of the LED display screen are basically put forward by the user first, which is customized by the manufacturer according to the needs. Each time, the circuit and mechanical structure must be designed repeatedly, resulting in a waste of resources. Moreover, if the needs of the user change, it will be very difficult to change.

Design of LED Display Screen Based on a Modularization 1

In fact, regardless of the size of the display screen, its principle is the same, so it is completely possible to design a standardized and modular LED display screen, which only needs to combine the corresponding modules for different needs. This paper introduces a modular LED display, which can flexibly change the size according to needs, run independently of the computer, and realize special effects such as flashing, rolling display and so on. The common problem of flashing due to insufficient refresh rate of the integral display screen is no longer a problem because it is divided into small modules in this design.

1 basic principleThe basic design idea is to divide the whole display screen into several display modules with the same size and function, and use a central control module to control and synchronize the operation of all display modules to realize the overall coordinated display.Therefore, the system is mainly composed of two parts: display module and control module.

The display module is actually a small LED driver board of the same size, which can drive the LED array, has basic display functions, and can receive data and commands from the control module. In addition, some common display effects such as flashing and scrolling are also included in the display module. The existing national standard dot matrix Chinese character library has 16 16 and 24 24. Considering the convenience of software writing and the ability of hardware, we regard the display module as 16 16 dot matrix size.The control module is responsible for controlling each display module and sending data and commands to each display module. The control module stores the lattice data information to be displayed and transmits it to each display module regularly. The control module is also equipped with a keypad and a universal asynchronous serial port, which can be operated by the keyboard or controlled by the computer, and the computer can also be used to update the data in the control module.The display module and control module are connected by bus, and we choose I2C bus.

The design and use of the whole system has a great degree of freedom: the number of display modules controlled by the control module can be changed, and the arrangement of display modules can also be changed (for example, 16 display modules can be 2) 8 can also be 4 4) , for the same display screen, several conditions can be saved and displayed separately with information. The lattice size of each information can be different, and the information exceeding the screen size can be scrolled. This can basically meet a variety of needs.2 circuit structurePIC16C73 is used as the central controller. The MCU has built-in I2C interface and serial port, and has strong port line driving ability (25mA per port line). It can simplify many peripheral circuits.

Design of LED Display Screen Based on a Modularization 2

Two EEPROM are used for data storage: x24256 provides a total of 64K bytes of data space, which can be erased and reset repeatedly, and the data will not be lost after power failure. If all are used to display 16 16 dot matrix Chinese characters can display about 2000. The data memory shares the I2C bus with each display module, and depends on their respective addresses to distinguish whether it is a memory or a display module.The keypad is externally connected with 4 current limiting resistors, which are directly connected to the port line of the CPU, and 4 current limiting resistors are used for the keyboard 4. Scanning mode.The connection between the control module and the computer uses RS232 serial port and a max202 for level conversion.

In addition, the control module also has a light intensity sensor, which is used to adjust the brightness of the display screen. Due to the great difference in ambient light intensity between day and night, LiangFang who feels appropriate during the day may sleep at night. Therefore, use this sensor to automatically adjust the brightness of the display screen according to the external light intensity. Tls235 optical frequency conversion element of TI company is used here.Each display module shall drive one 16 16 LED array, due to the small number of port lines of single chip microcomputer, it is impossible to use static display. Here, dynamic scanning display is used. Considering the refresh speed, there may be flicker when refreshing with 16 lines of scanning, so the method of 8 lines of scanning and 32-bit data is used.Each data line only corresponds to one light-emitting unit at each time, and the current is required to be small; When the display screen is fully open, 8 common anode scanning lines will correspond to 32 light-emitting units, and the current requirements are large, so the driving circuits at both ends are designed separately. Four tpic6b595 chips of TI company are used at the data line end. The scanning end uses two pieces of 2944 from allegro.

The display module and the control module are connected by I2C bus. Since the task of the display module is only display, no additional memory is added, and only the internal RAM unit saves the lattice data to be displayed and scans and displays it on the LED array continuously. Display effects such as scrolling and blinking only perform additional processing on the display data, such as the shift operation of scrolling the actual corresponding data. These functions are also written in the display module, and the control module sends commands to activate these functions.In addition, it should be noted that the driving circuit of the display module and the LED array can be regarded as two separate parts. As long as within the driving capacity of the driving circuit, LED arrays with different light-emitting units can be used, such as a small display board with only one LED or a large display board with 5 7 LEDs.3 software design

The software of the system includes a part: display module, control module and PC.

The software of the display module mainly includes three parts: scanning display, special effect processing and I2C communication. 32 bytes are opened in the ram of the three display module CPU as the display buffer. The scanning display program only takes data from the display buffer regularly and sends it to the mobile register, and sets the corresponding scanning line to realize one-time scanning. The scan display does not recognize what the data in the buffer is. Scanning takes advantage of the image retention effect of human eyes. If the scanning frequency reaches more than 60Hz, it is not sensitive to the fluctuation of scanning frequency. Therefore, the scanning display program here does not use timer interrupt, but is only completed by cycle.

Special effect processing refers to the operation of shifting the data in the scanning buffer, which mainly corresponds to the scrolling display effect. When scrolling, scroll one pixel row or column at a time. Most of the data already exists in the display module. When the control module sends the scrolling command, the United Nations adds two bytes (1 row or 1 column) of new data. Because the scanning method used is 32 8. Therefore, the data storage is not completely linear, but there is a jump storage part. In addition, the character rolling display has four directions up, down, left, right, so it is necessary to move the new data into the buffer and remove the two byte old data, so it is necessary to calculate the RAM address more complicated.

I2C communication is a function realized by PIC16C73 internal hardware. It is relatively simple and can be realized only by interrupt.

The adjustment function of display brightness is realized by adjusting the lighting time of the light-emitting unit. Specifically, due to the scanning display, each light-emitting unit can only be lit for 1 / 8 of the time at most. If all of this time is lit, the effect is the maximum brightness. If it is still not lit for some time within this 1 / 8 of the time, the overall display brightness will decrease. The display module receives the ambient brightness data from the control module and adjusts the proportion of the lighting time to realize the function of adjusting the brightness.

The control module program includes I2C communication with display module, I2C communication with EEPROM, serial communication with computer, data address calculation and external light intensity detection.Two I2C communication parts and serial communication are supported by hardware, which is relatively easy. The external light intensity sensor directly converts the light intensity into frequency and sends it to the CPU, so it only needs to count regularly. The more complex part is the address calculation of data. Because the degree of freedom and data of the system are stored in EEPROM by index, the address calculation logic is simple, but the implementation is complex. Different contents should be sent to each display module. The case of scrolling display is more complex.If it is a static display, the control module will only transmit data once after receiving the command and enter idle waiting: if it is a flashing, scrolling and other display, it is necessary to take data from EEPROM regularly to generate each display module.

The program of PC is mainly dot matrix editing function and RS232 communication function. Dot matrix editing can not only write characters of various fonts, but also draw simple graphics; RS232 communication not only includes all functions that can be realized by keyboard, but also can directly display graphics on the display screen without saving it to the control module to realize real-time information release.

The system has made a beneficial attempt to standardize and modularize the commonly used LED large screen display device, and has been applied to the occasion of traffic condition display, and achieved good results, which proves that the design is reasonable and feasible. Because the design retains a lot of freedom for use, it can be flexibly combined and applied to various occasions with different needs without repeated design, which effectively saves resources. At first, the system corresponds to a relatively small display screen, so I'm afraid I2C bus is selected. If you want to do a considerable display of zero, you can also replace it with RS485 bus to provide more room for expansion. In addition, based on this design idea, products such as color LED large screen display can be further developed.

Source; International LED network

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LED Display Screen Has Become More and More Popular and Has Become One of the Important Display Windows
LED Display Screen Has Become More and More Popular and Has Become One of the Important Display Windows
There is no doubt that in the process of global economic ups and downs and industrial development and Reform in recent decades, China's LED display industry has walked out of a new path of "self-development, self driving and self guidance" with its courage, strength and endurance, and finally won the dominant position of the global LED display industry.1 China speedIn 30 years, we have completed the road of 50 or even 70 years of the same industry in other countries, which is the speed of China's LED display industry!At the same time, the speed of China's LED display industry is not only reflected in the "rapid development and rise" of production scale, but also in the learning speed of a series of new technologies, new models and new ideas "from reference to independent innovation". In the early stage of development, subject to the limitations of imperfect industrial chain, lack of experience of industrial workers and imprecise production and manufacturing process, China's LED display screen really belongs to "barbaric growth". However, after years of quality revolution within the industry and consumption upgrading in the terminal market, China's LED display manufacturing and innovation has led the global industry.2 Industrial Cluster"The world's LED display manufacturing looks at China, and China's LED display manufacturing looks at Shenzhen". A complete industrial chain of LED displays from raw materials, lamp beads, chips, packaging and supporting design has been formed in Shenzhen, China, as well as industrial clusters applied in various subdivided fields. At the same time, driven by policies and market demand in recent years, it has also been in Jiangxi, Fujian and other places, The establishment of new industrial bases and clusters has promoted the rapid development of LED display industry.From the LED display manufacturing in the midstream to the core components in the upstream and then to the channel retailers in the downstream, it can be said that China's LED display industry has established a terminal oriented "user-centered" market-oriented operation system and forced mechanism, forming a vertical integrated industrial layout covering all categories, so as to achieve faster speed and higher efficiency, Lead the innovation of LED display technology and products in the world.3 Scale costCompared with foreign enterprises, Chinese LED screen enterprises can produce LED display products with the same quality and performance at only half the cost. This is not cutting corners and shoddy goods, but based on China's complete industrial chain, efficient operation and management level, low labor cost and a series of advantages.Until today, although the cost advantage of LED display manufacturing in China is lower than before, China still has a great leading advantage compared with the world. Driven by the unique "scale cost" advantage of Chinese LED screen enterprises, LED display has become more and more popular and has become one of the important display windows.
How to Effectively Prevent Aging of LED Display Screen and What Are the Prevention Methods
How to Effectively Prevent Aging of LED Display Screen and What Are the Prevention Methods
LED display advertising media also has the characteristics of high effective arrival rate. Compared with media placement forms such as TV and newspaper, the price of LED display screen is relatively low. These unique values make the full-color LED advertising screen media naturally become the upstart of outdoor media. Different from traditional outdoor media, full-color LED display is not only pure outdoor media. It also has the characteristics and advantages of television and other media. It has greater creative space and broad space for interaction and communication with consumers. It is a unique form of screen, which can meet personal needs, and has the communication concept of the digital age.We often encounter such problems when using LED display. The LED display screen can work normally at the beginning of the product, but after a period of time, there will be dim lights, flickers, faults, intermittent lighting, etc., which will seriously damage the product. According to the introduction of Shenzhen LED display manufacturer Dayuan intelligent, the reasons for this phenomenon are as follows:1. When using LED display screen, the welding process has the problems of high welding temperature, long welding time and inability to prevent static electricity. More than 95% of these problems are caused by the packaging process.2. There is a problem with the quality of the LED display itself or the production process.Preventive methods1. Control the welding process.2. Conduct aging test on the product.Aging is not only an important guarantee to ensure the reliability of electronic products, but also an essential step in product production. LED products can improve the performance after aging and help to maintain stable performance in future use. The aging test of LED display is a very important link in product quality control, but it is often ignored and can not be aged correctly and effectively. Led aging test is a countermeasure taken according to the characteristics of product failure rate curve to improve product reliability, but this method is not necessary. After all, aging testing sacrifices the life of a single LED product. pay the price.Led aging methods include constant current aging and constant voltage aging. A constant current source means that the current is constant at all times. There is a frequency problem, not a constant current. That is, AC or pulsating current. An AC or pulsating current source can be designed to have a constant RMS, but this power source cannot be called a constant current source. Constant current aging is not only the feature of LED current operation, but also a scientific led aging method. Overcurrent impact aging is also a new aging method adopted by Shenzhen LED display manufacturers. This aging is carried out by using a constant current source with adjustable frequency and adjustable current, so as to judge the quality and expected life of LED in a short time, and identify many hidden dangers that cannot be found by traditional aging.fqj
Four Methods for Prolonging the Service Life of Outdoor LED Display Screen
Four Methods for Prolonging the Service Life of Outdoor LED Display Screen
In midsummer, the weather with high temperature and rainfall gradually increases. Typhoons are frequent, especially thunder and lightning. Outdoor advertising LED display has relatively high requirements for the use environment. Considering that the outdoor LED display may be affected and damaged by high temperature, typhoon, rainstorm and lightning weather, in addition to the need for a comprehensive response plan, what are the precautions for the installation of outdoor LED display in order to improve its service life?1 High temperature protection. The outdoor LED display screen usually has a large area, which consumes a large amount of power in the application process, and the corresponding heat dissipation is also large. In addition, the external temperature is high. If the heat dissipation problem can not be solved in time, it is likely to cause problems such as heating and short circuit of the circuit board. In production, ensure that the display circuit board is in good condition, and try to select the hollow design in the shell design to help heat dissipation. During installation, it is necessary to adhere to the condition of the display screen and good ventilation according to the condition of the device. When necessary, heat dissipation equipment shall be added to the display screen, such as adding an air conditioner or fan to help the display screen heat dissipation.2 Typhoon prevention. The installation positions and methods of outdoor LED display screens are different, including wall mounted, inlaid, column type, hanging type, etc. Then, in the typhoon season, in order to keep the screen body of outdoor LED display screen from falling, there are strict requirements for the load-bearing steel frame structure of display screen. The engineering unit must design and install in strict accordance with the standard of typhoon resistance level, and also have a certain seismic capacity to ensure that the outdoor LED display will not fall, causing casualties and other hazards.3 Prevent rainstorm. There are many rainy weather in the south, so the LED display screen itself must have a high waterproof protection level in order not to be eroded by rain. In the outdoor use environment, the outdoor LED display shall reach the protection grade of IP65, the module shall be sealed with glue, the waterproof box shall be selected, and the module and the box shall be connected with waterproof rubber ring.4 Lightning protection. The impact of lightning on the display is fatal. If it is struck by lightning, the display will be seriously damaged. Therefore, the outdoor LED display must be installed with lightning rod and lightning protection equipment, grounded, and the distribution box shall be installed on the lightning protection device, and then grounded to protect the safety of the outdoor LED display.It is suggested that the production, construction and user units should take measures to prevent or reduce the damage of the display screen.
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