The Benefits of Wholesale Laptop Battery

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We suggest that you read through the article and learn how to fix your laptop problems.If you need to have a good understanding of the requirements of the world's most famous brands, then it is important to know that these are not just computer hardware, but also software and many other factors that influence the performance of the computer. It is also important to know that there are so many different types of laptop batteries that can be used in different applications. For example, a laptop battery is usually composed of two or more cells that each produce their own electricity. These cells then become charged when the computer starts up.Battery in cheep laptops are designed to work well for many years. The standard batteries that we use today are quite expensive and they do not have any good uses. So, it is important to know that there are other types of batteries that can be used for your laptop. In fact, there are different types of batteries that you can use for your laptop. If you want to use the best type of battery for your laptop, then you need to read through the following articles.The application of wholesale laptop batteryIt is very important to have good quality laptop battery. There are so many different types of laptop batteries available today. They can be expensive, hard to find, and sometimes just plain unreliable. It is important to have good quality laptop batteries. There are so many different types of laptop batteries available today. They can be expensive, hard to find, and sometimes just plain unreliable. It is important to have good quality laptop batteries. There are so many different types of laptop batteries available today. They can be expensive, hard to find, and sometimes just plain unreliable. It is important to have good quality laptop batteries.I've seen that it is not so easy to install the replacement laptop battery on a computer, and I'm really looking for some help. The problem is that I can't find any information on how to do it. So, what do you think? Please let me know your thoughts.There are a lot of people who have been using the same computer for years. And if you don't use it regularly, it can start to fail. The user can also find out that they are using the computer in a way that is not being safe. So they should get their computer repaired before they go out and spend a lot of money on a new computer. It is important to check that the computer is functioning properly before you purchase a new one.I don't think there is any way to make it easier to get a good night's sleep. The main problem with this system is that it does not give you enough control over your data. If you have more than one computer, it is important to have some sort of protection for your data. A good backup system is an essential part of any successful computer system. It is also important to have a proper antivirus program in order to keep your computer safe from viruses and other malicious programs. You can do this by installing a virus scanner on your computer.

1 What is the reason why the LED screen is completely black?During the application of the control system, we occasionally encounter the phenomenon that the LED screen is completely black. The same phenomenon may be caused by various reasons. Even the process of screen blackening will vary according to different operations or different environments. For example, it may be black at the moment of power on, black during loading, black after sending, etc1. Please ensure that all hardware, including the control system, is powered on correctly. ( 5V, do not connect reversely or wrongly)2. Check and repeatedly confirm whether the serial port cable used to connect the controller is loose or falling off. (if it turns black during loading, it may be caused by this reason, that is, the communication line is interrupted due to looseness during communication, so the screen turns black. Don't think that the line can't be loose if the screen body doesn't move. Please check it. It's very important to solve the problem quickly.)3. Check and confirm whether the LED screen and the hub distribution board connected to the main control card are tightly connected and inserted reversely.2 Why does the LED display screen appear bright lines for a few seconds or the screen image becomes blurred when it is just powered on?After the screen controller is properly connected with the computer, hub distribution board and screen, it is necessary to provide 5V power supply to the controller to make it work normally (at this time, do not directly connect with 220V voltage). At the moment of power on, a bright line or "flower screen" will appear on the screen for a few seconds. The bright line or "flower screen" is a normal test phenomenon to remind the user that the screen is about to start working normally. Within 2 seconds, the phenomenon is automatically eliminated and the screen enters the normal working state.3 The reason why the whole screen of the unit board is not bright or dark1. Visually check whether the power connection line, 26p cable between unit boards and the indicator light of power module are normal.2. Use a multimeter to measure whether the unit board has normal voltage, and then measure whether the voltage output of the power module is normal. If not, it is judged that the power module is broken.3. Measure the low voltage of the power module and adjust the fine adjustment (the fine adjustment at the power module close to the indicator light) to make the voltage reach the standard.4 What are the reasons for the failure to load or communicate?The reasons for communication failure and loading failure are roughly the same, which may be caused by the following reasons. Please compare with the operation according to the listed items:1. Ensure that the control system hardware is properly powered on.2. Check and confirm that the serial port line used to connect the controller is a straight line rather than a cross line.3. Check and confirm that the serial port connecting wire is intact and there is no looseness or falling off at both ends.4. Select the correct product model, correct transmission mode, correct serial port number and correct serial transmission rate according to the LED display control software and the selected control card, and correctly set the address and serial transmission rate on the hardware of the control system according to the dial switch diagram provided in the software.5. Check whether the jumper cap is loose or falls off; If the jumper cap is not loose, ensure that the jumper cap is oriented correctly.6. If it still fails to load after the above inspection and correction, please use a multimeter to measure whether the serial port of the connected computer or control system hardware is damaged to confirm whether it should be returned to the computer manufacturer or the control system hardware for testing.

At present, the small and medium-sized LED display systems in the market generally use the traditional single chip microcomputer as the main control chip. For the LED large screen display, due to the large amount of data transmission, the scanning speed is required to be fast, while the internal resources of the single chip microcomputer are less and the running speed is slow, which is difficult to meet the system requirements. FPGA is used as the controller. On the one hand, FPGA uses software programming to realize hardware functions, which is fast; On the other hand, it has rich pin resources and strong scalability. Therefore, the control of large screen LED display screen can be realized by using single-chip FPGA and simple peripheral circuit without designing Chinese character library. It has the advantages of high integration, good stability, flexible design and high efficiency.1. Overall system structureThe LED large screen display system is composed of upper computer (PC), single chip microcomputer system, FPGA controller, row and column driving circuit of LED display screen and other modules, as shown in Figure 1. The upper computer is responsible for the collection and transmission of Chinese characters, characters and other data. The single chip microcomputer system and the upper computer work in the mode of asynchronous serial communication. The graphic dot matrix data to be displayed which has completed format conversion is obtained from the upper computer through the serial port, and stored in EEPROM memory. Then, the display data of the memory is restored to the LED display screen through the FPGA controller. The scanning control circuit adopts programmable logic chip cyclone ep1c6, which is programmed with VHDL language, adopts 1 / 16 scanning mode, and the refresh frequency is above 60 Hz. This paper focuses on 256 & times; FPGA control module of 1024 monochrome graphic display screen.2. Basic working principle of LED displayFor the large screen LED display, the column display data usually adopts the serial transmission mode, and the row adopts the 1 / 16 scanning mode. Figure 2 shows 16 & times; The basic structure of 32 dot matrix screen unit module, and the column drive circuit is cascaded by four 74HC595. Under the action of the shift pulse srclk, the serial data is input bit by bit from the data port ser of 74HC595. When all 32 columns of data in a row are transmitted, the latch signal rCLK is output and the pass signal Y0 is selected, then each column of data in the first row can be displayed as required. The remaining rows are displayed in the same way. When 16 rows of data are scanned once (i.e. one cycle is completed), the scanning of the next cycle starts from the first row. As long as the scanning period is less than 20 ms, the display does not flash.256&TImes; 1024 large screen display consists of 16 & times; 16 of 32 32 dot matrix screens are cascaded. In order to shorten the signal transmission time from the control system to the screen, the display data is divided into 16 areas, each area is composed of 16 1024 dot matrix, each line of data is 1024 / 8 = 128 bytes, the pixel signal of the display screen is transmitted and shifted from the right side to the left side of the LED display screen, and the data of 16 partitions are stored in the same memory. The display data of one screen is 32 KB. To accurately read the data of 16 partitions, the read address of the memory is composed of 16 bits. Since the data is only 32 KB, it can be set to 0 at most. The other 15 bit addresses are row address (4 bits), column address (7 bits) and partition address (4 bits) from high to low. The decoded signal (Y0 Y15) of the 4-bit partition address is used as the latch pulse of the latch. Within 16 read address generation cycles, the first byte data of the 1st 16th partitions are successively latched to the corresponding latch, and then the 16 byte data is simultaneously latched into 16 8-bit parallel to serial shift register groups at the rising edge of the shift latch signal. In the next 16 read address generation clock cycles, on the one hand, the parallel to serial shift register shifts the 8-bit data to serial output, and the shift clock is the frequency division of the read address generation clock; On the other hand, the second byte data of 16 partitions are sequentially read out and locked into the corresponding latch. After all the first row data of all partitions are sequentially read out according to this law, all serial shift data are output on the rising edge of the data effective pulse signal to drive the LED display. Next, the data of the second row is shifted and output, and the first row remains displayed during this period; After all the second line is moved in, drive the second line display and move in the third line at the same time... Complete the scanning and display of the whole LED large screen in this way of branch scanning of each partition.3 design of display controller based on FPGA3.1 overall scheme of FPGA control moduleAs shown in Figure 3, the FPGA control module is mainly composed of MCU and FPGA interface, data reading and writing module, read address generator, decoder, row address generator, data latch group, shift register group, pulse generator and other modules.The read address generator mainly generates the read address signal, which is sent to the MCU interface and data read-write module to read the processed LED display data in the external sram1 or sram2, and send the data to the data latch group for locking according to the partition mode. The latch outputs 16 partition data, realizes parallel serial conversion through the shift register group, obtains the serial data required by the display screen, and sends it to the LED display screen column drive circuit. The pulse generator provides the corresponding synchronous clock for each module, and the line address generator generates the corresponding line signal and sends it to the line driving circuit of the display screen.3.2 interface between MCU and FPGA and data reading and writing moduleThe interface between MCU and FPGA and the structure of data reading and writing module are shown in Figure 4. After the single chip microcomputer reads the data from EEPROM and processes it according to the display requirements, it sends the data to the data buffer sram1 or sram2 through the interface and data reading and writing module. In order to improve the data transmission speed and ensure the continuity of display effect, the dual body switching technology is used to complete the data storage process in the system. In other words, the dual SRAM storage structure is adopted, and two sets of completely independent read and write address lines and data lines are switched in turn for reading and writing. When working, FPGA only reads the displayed data from one of the two SRAMs for display at a specific time, and the other SRAM exchanges data with MCU. MCU will write new data and work alternately in turn to realize display modes such as left shift, up shift and double screen. If the displayed content does not change, that is, the data in one SRAM remains unchanged, MCU does not need to write data to another SRAM.The module is implemented by VHDL finite state machine. The whole control is divided into four states, and the state transition diagram is shown in Figure 5. The working process is as follows: the system starts up and enters the initial state st0, the write enable end e of the single chip microcomputer is low level, the single chip microcomputer reads the data from the EEPROM and writes the data to sram1, and the FPGA reads the data in sram2 at the same time; When the MCU data writes a screen of data, e changes to high level, and when the FPGA reads the data from sram2 and ends the signal read_ End is low level and enters ST1 state.In ST1 state, if no new data is written, e remains high, and FPGA reads the data of sram1 for static display; Only when the read in control signal e of the single chip microcomputer is low and read_ End is at low level and enters ST2 state. In the ST2 state, the single chip microcomputer writes the data into sram2, and the FPGA reads the data of sram1. After the single chip microcomputer writes the data, e becomes high level, and when the FPGA reads the data on one screen, read_ End is low level and enters ST3 state. In ST3 state, if no new data is written, e is high level, FPGA reads the data in sram2. When the MCU has new data written, e becomes low level, and read after reading the data on one screen of FPGA_ When end is low level, re-enter st0 state. Through this cycle of alternating work to complete data writing and reading, the port program is as follows:3.3 read address generatorThe read address generator mainly generates the read address signal of the external buffer sram1 (sram2), so that the system can correctly read the corresponding display data from the memory. The highest bit of the address is 0, and the other addresses are 15 bit effective address signals of row address (hang [3.. 0]), column address (lie [6.. 0]) and partition address (Qu [3.. 0]). Read out 16 byte data in sram1 (sram2) within 16 pulse cycles, and some VHDL source programs are as follows:3.4 decoderThe decoder module mainly generates 16 partition signals (low-level effective), controls 16 latches respectively, and locks the display data of 16 partitions in the corresponding latches respectively.3.5 data latch group and shift register group moduleThe data latch group module consists of 16 8-bit latches, which latch the data of 16 partitions. The shift register group module is composed of 16 8-bit shift registers, which converts the 8-bit parallel data in each latch into 16 channels of serial data output at the same time, drives the LED display screen and realizes the parallel serial conversion of data.The generated component symbols are shown in Figure 6. Among them, data in [7.. 0] is the 8-bit parallel data input of each partition, SCLK is the shift clock, CLR is the zero clearing signal, load is the data latch signal, CS [15.. 0] is the input signal of 16 partition (connected to the output of decoder), data_ Out [15.. 0] is 16 channel serial data output.3.6 pulse generatorThe system adopts 1 / 16 scanning mode to divide the data into 16 partitions, and the data in 16 partitions are transmitted at the same time. Assuming that the refresh frequency is 60 Hz (i.e. the period is 16.67 MS), the display time of each line is about 16.67 MS / 16 = 1.04 Ms. If there are 1024 bits in each line, the shift pulse period is 1.04 / 1024 = 1.02 s. That is, the shift frequency above 0.983 MHz can meet the requirements. Since the shift pulse is 2 frequency division of the clock of the data reading module, the clock of the system is at least 1.97 MHz. The system adopts 50 MHz clock source. The timing diagram is shown in Figure 7.Wherein, rdclk is the FPGA read data clock; SCLK is the shift clock of serial output and the 2-frequency division of rdclk; Load is a data latch signal. A latch signal is generated after reading a byte data in 16 partitions each time. The data is locked in the data latch group, and its clock is 16 frequency division of rdclk.4 simulation test of FPGA control moduleA project is established in QuartusII 5.1, and the schematic diagram file is established. The module element symbols generated by the interface between MCU and FPGA and the unit modules such as data reading and writing module, read address generator, decoder, line address generator, data latch, shift register and pulse generator are connected to form the logic diagram of the general control module and simulate its function. The simulation results are shown in Fig. 8. 16 bytes of data are read from the memory and 16 channels of serial data are output through parallel serial conversion. From the waveform analysis, the function is correct, and the signals of each output port meet the timing requirements.epilogueFPGA is an on-line programmable chip, which can be programmed according to different user requirements, which shortens the development cycle of the system and saves the development cost of hardware. In this paper, FPGA is the main chip, and the control system of large screen LED monochrome graphic display screen is designed completely. With the development of LED display technology, the combination of FPGA and arm or DSP will be widely used in the field of two-color display and color display.

LED display screen is widely used in industrial and mining enterprises, schools, shopping malls, shops, public places, etc. for graphic display, advertising and information release. This paper designs a system composed of four 16 The display screen composed of 16 dot matrix LED module is controlled by single chip microcomputer to smoothly move and display any number of words or graphic symbols. This circuit can be cascaded and expanded to realize any number of 16 Display screen composed of 16 dot matrix LED module.1 circuit designThe control circuit is controlled by AT89C51 single chip microcomputer, and the display screen is composed of 4 16 16 dot matrix LED modules, each 16 The 16 dot matrix LED module consists of 4 8 Composed of 8-dot matrix LED modules, users can expand and add any number of 16 as needed 16 dot matrix LED module. eight The structure of 8-dot matrix LED module is shown in Figure 1, with a total of 8 rows and 8 columns. Each LED is placed at the intersection of row line and column line, with a total of 64 LEDs. When a column is at high level and a behavior is at low level, the corresponding LED is on.The P3.0 pin of the single chip microcomputer is connected to the serial data input of the serial input and parallel output shift register 74LS164 (U10), eight 74LS164 (U10 U17) are cascaded, and the P3.1 pin is connected to the clock pulse input of eight 74lsl64; Eight 74LS164 are respectively connected to eight latches 74ls373 (U18 u25), and the data output terminals of the eight latches are connected to four 16 Row line of 16 dot matrix LED module, each 16 The line of 16 dot matrix LED module is controlled independently. P1. O is connected to 8 clock pulse inputs of 74LS164 (U2 u9), P1.1 is connected to serial data inputs of U2, U4, U6 and U8, and every two 74lsl64 (U2 and U3, U4 and U5, U6 and U7, U8 and u9) are cascaded; Four 16 parallel data output terminals of U2 u9 are connected 64 array lines of 16 dot matrix LED module. P1.2 is connected to the clear 0 terminal of all 74lsl64, and p1.3 is connected to the latch control terminal of the latch.2 working principleThis circuit uses the serial communication port to work in mode 0, and uses P1. O and P1.1 to simulate the serial output to realize the smooth moving display of LED display characters. Because the LED module is 16 16 dot matrix, so the character dot matrix is also 16 16 dot matrix, that is, each character is composed of 32 bytes, that is, 16 word data. Each word data determines the lighting of each column of LED. sixteen 16 dot matrix character data is obtained by character dot matrix extraction software.Firstly, the single chip microcomputer P1.1 serially outputs a binary bit "1", which is sent to four 16 bits through four groups of 74lsl64 The first column of 16 dot matrix LED module is sent to a high level, and then four 16 bits are output serially by P3. O The row data in the first column of the 16 dot matrix LED module, that is, the row data in columns Y1, y17, y33 and y49, is sent to the row line of the LED display screen after being locked by 74ls373. At this time, the corresponding LED in the first column of each LED module is on. The row data of each column is one word data, and there are four word data in four columns. The address difference of the first byte of each word data in the character dot matrix data table is 32. At this time, each LED module displays the first column of each character. Then P1.1 serially outputs one binary bit "0", which is shifted by four groups of 74LS164, and then sends a high level to the second column of four LED modules, and then P3. O serially outputs four 16 bits The row data in the second column of the 16 dot matrix LED module, that is, the row data in columns Y2, Y18, y34 and Y50, is latched by 74ls373 and sent to the row line of the LED display screen. At this time, the LED corresponding to the second column of each LED module is lit, that is, the second column of each character is displayed. In this cycle, turn on the corresponding LEDs in each column of each LED module in turn until the 16th column of each LED module is turned on, that is, the columns of each character are displayed in turn. As long as the alternating display time of each column is appropriate, and using the visual persistence characteristics of human eyes, it seems that 16 columns of LEDs are lit at the same time, that is, the whole character is displayed at the same time. Then scan the display from column 1 to column 16, and cycle for many times to ensure that the displayed characters have sufficient brightness.In order to achieve the effect of smooth moving display of characters, after the above four characters are statically displayed for a certain time, when scanning the display again, the first column of each LED module starts from the second column data of each character, that is, the first LED module displays the second column, the third column,..., the 16th column of the first character and the first column of the second character, The second LED module displays the second column, the third column,..., the 16th column of the second character and the first column, the second column,... Of the third character. In the third scanning display, the first column of each LED module starts scanning display from the third column data of each character, that is, the first LED module displays the third column, the fourth column,..., the 16th column of the first character and the first column and the second column of the second character, and the second LED module displays the third column, the fourth column,..., the 16th column of the second character and the first column, the second column,... Of the third character. In this way, the smooth moving display of characters is realized.3 ProgrammingAccording to the above circuit design and working principle, the control program flow chart of this circuit is drawn. Write the control program according to the program flow chart, and generate the object code file after debugging with wave or keil software.4 circuit simulationThe object code file is added to the single chip microcomputer in the simulation diagram of LED display control circuit drawn by Proteus Software, and the simulation runs. The running results are shown in Figure 4.Circuit design of LED display based on AT89C51 single chip microcomputer5 ConclusionThe LED display control circuit uses a single chip microcomputer as the controller and adopts the serial shift output mode to realize the smooth moving display of a line of characters. In practical application, relevant driving circuits should also be added. The circuit can be extended by any number of 16 16 dot matrix LED module composed of LED display screen display control. The practical application shows that the circuit is stable and reliable, and the effect is good.

The first is high luminous efficiency: the luminous efficiency of LED display screen can be said to be an important indicator of energy-saving effect. At present, China needs to strengthen the luminous efficiency. To really achieve high luminous efficiency, we should solve relevant technical problems from all links of the industrial chain, so how to achieve high luminous efficiency? This paper will discuss the technical problems to be solved in epitaxy, chip, packaging, lamps and other links.1. Improve internal quantum efficiency and external quantum efficiency.2. Improve the light output efficiency and reduce the junction temperature.3. Improve the lighting efficiency of lamps.Secondly, from the perspective of high color rendering: there are many light and color quality of LED display screen, including color temperature, color rendering, light and color fidelity, light and color naturalness, tone recognition, visual comfort and so on. Here, we only discuss how to solve the problems of color temperature and color rendering. Making high color rendering LED display light source will lose more light effect, so these two factors should be taken into account in design. Of course, the combination of RGB three primary colors must be considered to improve the high color rendering. Here, I also have three methods:1. Multicolor phosphor.2. RGB multi chip combination.3. Phosphor and chip.Thirdly, in terms of high reliability, it mainly includes failure rate, service life and other indicators. However, there are different understandings and explanations in application. High reliability refers to the ability of products to complete specified functions under specified conditions and within specified time. Led failure categories mainly include serious failure and parameter failure. Life is the characteristic value of product reliability It generally refers to the statistical average. For a large number of components, the life of LED devices is the meaning of this description. However, the factors affecting the reliability of LED display products include chip manufacturing, packaging, thermal resistance, heat dissipation and so on. Now that we are talking about this, we hope that enterprises will make two requirements for LED display products on the basis of total quality control:1. Reduce failure rate.2. Prolong the wear and tear failure time.Finally, it is to reduce the product cost: at present, many consumers feel that the price is too high when purchasing LED display screen. Therefore, many LED display screen entrepreneurs have also taken corresponding measures to reduce the cost. In addition to mass production, they mainly take technical measures to reduce the cost. It is mainly to reduce the cost in epitaxial chip, packaging, driving and heat dissipation, so as to fundamentally solve the cost problem of LED display products. Specifically, it is discussed from the following four aspects:1. Method for reducing cost of epitaxial chip link.2. Methods to reduce the cost of packaging.3. Methods to reduce the cost of lamps.4. Reduction of other supporting costsThe above mainly solves the main technologies of LED display screen and takes corresponding measures from the four technologies of high luminous efficiency, high color rendering, high reliability and low cost. Generally speaking, in addition to adopting new technologies, new processes, new structures and new materials to realize high luminous efficiency, high color rendering, high reliability and low cost of LED display screen, from a deep level, We should take improving energy efficiency and light color quality as the higher requirements of LED display screen, so as to really provide people with the demand of products!

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The nine story platform starts from building soil.Since its establishment, Ruifeng RGB business department has defined the strategy of establishing a high-quality RGB LED packaging brand. After more than six years of hard work, the RGB business unit, following the changes of the LED display market and product changes, has always focused on providing high-quality outdoor engineering display, outdoor small spacing display and indoor customized display LED devices for LED display customers, and has gradually been recognized by well-known display and media enterprises all over the world, Recognition and favor of Ruifeng RGB LED by engineering display enterprises and LED display listed enterprisesIn the LED display engineering market, Ruifeng RGB LED division cooperates with display screen customers to focus on products, innovation and customer experience, continuously improve the comprehensive competitiveness of products, stand out in more and more outdoor display schemes, and continuously light up the C position of the city!BeijingJuntai department store large screenThe first high-definition 4K outdoor LED screen in China - Juntai department store displayJuntai department store LED display is a landmark LED display jointly created by Phoenix City media, Shanghai Sansi and Ruifeng optoelectronics. Juntai display screen is known as "China's first street" - the largest LED display on Beijing Chang'an Street. It is also the first high-definition 4K outdoor LED screen in China. It is installed in Beijing Xidan Juntai department store, known as "Beijing shopping paradise". It is a well deserved landmark flagship LED screen.The screen has a length of 54 meters, a height of 13.44 meters and a display area of more than 730 square meters. This screen needs to be continuously lit for 18 hours every day, which is a high quality test for all materials such as LED and the overall system. Up to now, it has been working continuously and stably for nearly 6 years.ShanghaiBailemen displayHigh end led commercial display screen of Shanghai Bailemen buildingShanghai Bailemen is a famous ten mile foreign market in modern Chinese history. It is a traditional "aristocratic area" with both nostalgic atmosphere of old Shanghai and modern style.The display screen using Ruifeng photoelectric high-end LED (model: * * 35is-a42) stands in the middle of the gate of Shanghai Bailemen building at the intersection of Nanjing West Road and Huashan Road in Shanghai, covering an area of more than 340 square meters. Across the road is Jing'an ancient temple, a famous temple in the south of the Yangtze River. The LED screen is located in the CBD center of high-end office buildings on Nanjing West Road, Shanghai. It sits in the Jing'an Temple business district, which includes global high-end luxury brand stores. The advertising content of the screen covers a large number of high-end business people and shopping buyers.GuangzhouTianhe Swire screenGuangzhou Tianhe CBD taikoohui LED advertising media displayThe display screen is still the advertising media display screen project of Phoenix City media. The display screen is 35.8 meters long, 13.44 meters high and has a display area of 482 square meters. Similarly, this large LED screen is the portal display of Tianhe CBD business district, the largest business district in Guangzhou and even South China.Ruifeng optoelectronics provides bright 35rgb led to add light and color to the screen. Ruifeng photoelectric 35rgb LED provides stable optical output quality, which is close to the defective failure ratio of 0ppm. Based on the strict requirements of Engineering display projects, Ruifeng photoelectric RGB LED regularly carries out the rigorous reliability verification and regular quality process audit of the highest standard in the industry in the company's internal quality assurance system.ShenzhenChina TV building screen / Huaqiang North modern window screenLed commercial screen of Shenzhen Zhongdian buildingThe screen of Shenzhen CLP building is erected in the CLP building on Shennan Middle Road, the main road in Shenzhen. There are also famous landmark buildings such as SEG square and Huaqiang Building. The total area is nearly 500 square meters.Large LED commercial screen in central area of Huaqiang North Business DistrictShenzhen Huaqiangbei modern window screen (LED screen of cyber Digital Plaza) is located in the central area of Huaqiangbei business district known as "China's first electronic street", surrounded by well-known commercial squares such as women's world, Maoye department store, Manha Plaza and New Asia Center.Ruifeng optoelectronics also provides high-quality RGB LED devices for the two LED display projects in Huaqiangbei business district to ensure the stable work of the large screen day after day and year after year, and provide reliable quality assurance for customers. Let LED display partners get value for money.EuropeLuxury shopping mall projectLarge LED screen of luxury shopping mall in Brussels, BelgiumThe project is a classic high-end display project of Ruifeng optoelectronics and Shenzhen Deming optical technology in Europe. It is located in a luxury shopping mall on Brussels Street, Belgium. Many LED displays are embedded in the wall of the mall, mainly interpreting and playing global luxury advertising, so European customers have particularly high requirements for the image quality of LED display. The LED screen adopts p2.5 point spacing and Ruifeng's 1515 gold wire all black lamp product (model: 21hs-a45) to provide European customers with RGB LED products with high brightness, low power consumption and the highest outdoor display contrast, so as to provide customers with the best picture quality and color effect for the advertising effect displayed on the display screen.HangzhouYintai department store (Wulin) arc displayHangzhou Yintai department store (Wulin) commercial arc screenYintai department store (Wulin Plaza) screen is located on the roof of Hangzhou Yintai department store. The screen is arc display, with a total area of 1008 square meters. Wulin Square and Yan'an Road Business District, the largest business district in Hangzhou, are illuminated all night. With large area and excellent display screen, this screen occupies the core position of Hangzhou and can be called "the largest screen in Hangzhou". At that time, the customer (Shanghai Sansi) put forward two special requirements. Because the screen presents the relationship of L-shaped arc display as a whole, it needs higher consistent half power angle output, and the power output limit per square meter is required. The technical team of Ruifeng photoelectric RGB division accumulated technology through LED support design, process improvement and customized manufacturing capacity, Perfectly meet the customer's requirements.ZunyiHigh speed rail Metro giant led sky curtainGiant led creative sky curtain of Zunyi High Speed Railway New TownThe huge sky curtain of large commercial buildings brings us unprecedented visual shock and dreamlike feeling. Ruifeng optoelectronics provides bright outdoor 2828 RGB LED (model: * * 28is-a43), and has completed an LED display ceiling with an area of 8500 square meters for the customer (Shenzhen Alto Lixiang) in Zunyi high speed railway new town.The project has a length of about 220 meters, a maximum width of 60 meters and a height of about 30 meters. It is integrated into the shopping center building to connect the two buildings through this "sky curtain light and shadow". It is the overall design concept of Alto Lixiang project, of course, including the delivery of Ruifeng photoelectric brilliant and stable RGB LED, the beautiful sky curtain after lighting, multi surface modeling and dazzling display effect highlight the effect of immersive experience.This project has also been selected as the "top ten excellent display engineering projects in 2020" by the LED display application industry. Ruifeng optoelectronics is proud and cheered for our customers!ChongqingMeilian Plaza "Chongqing light" naked eye 3D large screenChongqing Meilian Plaza naked eye 3D LED large screenNear the Spring Festival in 2020, Meilian square in Chongqing airport business district is also the first core hinterland for foreign tourists to arrive in Chongqing. The naked eye 3D led giant screen created by Ruifeng optoelectronics and Shenzhen LianJian optoelectronics instantly appears in the circle with the picture of super space-time 3D flying man, which adds new charm to Chongqing and is known as "the light of Chongqing".Ruifeng photoelectric 2727 RGB LED (model: 28is-a47) used in this large screen adds a lot of color to the dazzling color, bright and wide viewing angle display of the whole giant screen and the naked eye 3D effect that shocked the night sky of Chongqing.Not limited to this, Ruifeng optoelectronics has provided many outdoor engineering display LED devices with stable quality and excellent performance for high-end display customers in the industry. Ruifeng optoelectronics's RGB LEDs will continue to flash in the core business districts, CBD and overseas central cities of many big cities, including Beijing, Shanghai, Guangzhou and Shenzhen. Ruifeng Optoelectronics RGB products continue to provide high-quality RGB LED products and services, which we are equipped with Combined LED display customers will always strive for the c-position of outdoor display in the city!We are very grateful to all the customers who have provided led display cases above, and of course, we are also grateful to more excellent customers and partners who have not been mentioned. Xiongguan is like iron, and now we are moving from scratch. In the future, Ruifeng photoelectric RGB business unit will still follow the pulse of LED display market and create more value for display customers!Original title: Ruifeng RGB, flashing in City C!The source of the article: official account of WeChat: Ruifeng photoelectric Co., Ltd. welcome to add attention!

1. Size design of display screenThere are three particularly important factors in designing the screen size:(1) Display unit template size (indoor screen) or pixel size (outdoor screen);(2) Site space conditions;(3) Need to display content.2. Power consumption and power supply requirements of dealer display screen of lyad Henan BranchThe power consumption of the display screen is divided into average power consumption and maximum power consumption. Average power consumption, also known as working power, is the actual power consumption at ordinary times. The maximum power consumption is the power consumption under extreme conditions such as startup or full light. The maximum power consumption is the factor that must be considered for AC power supply (wire diameter, switch, etc.). The average power consumption is generally 1 / 3 of the maximum power consumption.The display screen is a large precision electronic equipment. In order to use safely and work reliably, its AC220V power input terminal or the AC220V power input terminal of the computer connected to it must be grounded.Note: the AC220V power input grounding terminal of the computer has been connected with the computer casing.3. Problems to be considered for outdoor screenThe main problems of outdoor screen are as follows:(1) The display screen is installed outdoors, often exposed to the sun and rain, wind and dust cover, and the working environment is poor. If the electronic equipment is wet or seriously damp, it will cause short circuit or even fire, failure or even fire, resulting in loss;(2) The display screen may be attacked by strong current and magnetic field caused by lightning;(3) The ambient temperature varies greatly. When the display screen works, it must generate a certain amount of heat. If the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may not work normally or even be burned, so that the display system cannot work normally;(4) Wide audience, long sight distance and wide field of vision; The ambient light varies greatly, especially may be exposed to direct sunlight.In view of the above special requirements, the outdoor display screen of dealers of lyad Henan branch must:(1) The screen body and the joint between the screen body and the building must be strictly waterproof and leak proof; The screen body shall be provided with good drainage measures to ensure smooth drainage in case of ponding;(2) Install lightning protection devices on display screens and buildings. The main body and shell of the display screen shall be well grounded, and the grounding resistance shall be less than 3 , so that the large current caused by lightning can be discharged in time;(3) Install ventilation equipment to cool down and make the internal temperature of the screen between - 10 and 40 . An axial flow fan is installed above the back of the screen to discharge heat;(4) Industrial grade integrated circuit chips with working temperature between - 40 80 shall be selected to prevent the display screen from starting due to too low temperature in winter.(5) In order to ensure long-distance visibility under strong ambient light, ultra-high brightness LED must be selected;(6) The display medium adopts a new wide viewing angle tube with wide viewing angle, pure color, consistency and coordination, and the service life is more than 100000 hours. The outer packaging of display media is the most popular square cylinder with cover edge, sealed with silica gel and non metallized assembly; Its appearance is exquisite and beautiful, firm and durable. It has the characteristics of "five prevention" against direct sunlight, dust, water, high temperature and circuit short circuit.Zhengzhou Hengyuan Optoelectronics (Zhengzhou Hengyuan display equipment Co., Ltd.) was established in 2007 and is the general distributor of lyade LED electronic display screen in Henan. Liyade Henan Branch, after more than ten years of development, the company headquarters has established a large spot warehouse in Zhengzhou Zhongli advertising market, and built Zhengdong center in Zhengdong New Area, with Flagship Exhibition Hall, office area, etc. It also has branches in Hohhot, Lanzhou, Xining, Yinchuan, Lhasa, Shandong and other cities. The company is mainly engaged in LED display screen, and its agent brands include: liad (the market value of LED display screen ranks first in the industry), Shanghai yangbang control card, Xi'an Nova control card, Changzhou Chuanglian power supply, hy full-color power supply, distribution cabinet, video processor and other LED display screen peripheral supporting products. Channel products, indoor, outdoor, small spacing 1.8, 1.5, 1.2, all-in-one conference machines are available.

key word:LED, display1. Factors determining display priceAs an important production base of global LED display screen, China has many manufacturers, but the prices of each manufacturer are very different. The determinant of the display price lies in the choice of materials. Mainly reflected in:1) The use of LED die materials is different: good LED die has high brightness, small brightness attenuation, long service life, good color consistency and slightly higher price.2) Use of connectors: high quality connectors have high plugging times, which is conducive to long-term maintenance and operation of the display screen; The price is higher than that of inferior connectors;3) Use of control system: the high-quality control system makes the display screen have higher refresh frequency, color gray and contrast, and the software operation is convenient.As a bulk consumer commodity, the stability of quality and service life of display screen are very important. Cheap and inferior products will only bring endless maintenance difficulties to customers; It causes more and more heavy after-sales service burden to manufacturers.2. Display screen installation and after-sales serviceA. In the production process of our display screen, we pay attention to simplifying the structure as much as possible to facilitate installation. At the same time, we will also provide customers with frame structure diagram as a reference. Our quotation does not include installation cost, unless otherwise agreed in the purchase contract.B. The warranty period of the display is 3 years. During the warranty period, all damaged parts not caused by improper operation can be replaced free of charge, but the customer shall mail the replaced damaged parts to our company at his own cost; Our company will mail the new parts to the customer within two working days after receiving them.Led FAQsLed attaches great importance to anti-static measures. The following are some instructions for static electricity and anti-static:1. Sources of static electricity: the sources of static electricity affecting the circuit mainly include human body, plastic products and relevant equipment and instruments, among which the static power from the use environment includes the following items:1) Objects and materials2) Floors, tables and chairs3) Work clothes, packaging containers4) Painted or waxed surfaces, organic and fiberglass materials.5) Cement floor, painted or waxed floor, plastic floor tile or floor leather.6) Chemical fiber work clothes, non-conductive work shoes, clean cotton work clothes.7) plastics, packaging boxes, boxes, bags, pads, foam plastic gaskets.2. Failure modes of electrostatic discharge: sudden failure and potential failure.More than 90% of electrostatic failure in the service environment is potential failure, which shows that the anti electric over stress ability of the circuit is weakened and the service life is shortened.3. Anti static measures:1) Provide training on electrostatic knowledge and related technologies for personnel using electrostatic sensitive circuits.2) An anti-static working area shall be established, in which the anti-static floor, anti-static workbench, anti-static grounding lead and anti-static appliances shall be used, and the relative humidity of the area shall be controlled above 40.3) The harm caused by static electricity to electronic equipment may be released anywhere from the manufacturer to field equipment. The hazard is caused by insufficient and effective training and equipment operation failure. LED is a device sensitive to static electricity. InGaN chip is usually considered as the "first" vulnerable to interference. AlInGaP leads Shi is "second" or better.4) ESD damaged equipment can show dim, blurred, extinguished, short or low VF or VR. ESD damaged equipment shall not be confused with electronic overload, such as wrong current design or drive, chip hanging, wire shielding, grounding or packaging, or ordinary environmental induced pressure, etc.5) ESD safety and control procedures: ESD of most electronic and electro-optical companies is very similar, and ESD control, manipulation and main procedures of all equipment have been successfully realized. These procedures have been used to detect the quality effect of instruments. ISO-9000 certification also lists it as a normal control procedure.4. Transportation and packagingDuring daily operation, ESD sensitive equipment shall always be stored in anti-static bags or containers. This includes inventory storage, transportation and WIP. Precautions during transportation include the consumption of motorcade, boxes or other equipment, such as conductive wheels or trailers, and the grounding of ESD equipment during transportation. The standard for clarifying and ensuring the quality of packaging materials is ANSI / esds11.31-1994, the standard for normal use of packaging marks is ANSI / ESD / esds8.1-1993, and the standards for packaging materials are ANSI / eia-541-88 and ANSI / eia-588-91.

Application and classification of LEDLED is a kind of semiconductor solid device. The most significant advantages are: long service life, high photoelectric conversion efficiency, impact resistance, small volume and safe use.LEDs are widely used in daily life, such as indicator lights of household appliances, car tail lights, building lighting, traffic lights, display screens, etc; With the development of LED, especially white light, LED will be more and more widely used: outdoor neon lights, car headlights, indoor lights, etc. will be replaced by LED. The LED display screen arranges the LEDs into a matrix according to the actual needs, and is equipped with special display circuit, DC regulated power supply, software, frame and external decoration to form an LED display screen, which can dynamically display text data, graphics and video images.LED display has a wide range of uses and types: there are three main categories: indoor and outdoor, color and pixel density. Others are classified according to different LED packaging methods and working methods.In terms of energy saving, it can be divided into ordinary screen and energy-saving screen:The energy-saving screen is equipped with a temperature intelligent control system to automatically adjust the fan speed according to the box temperature; Equipped with intelligent brightness control system to automatically adjust the picture brightness according to the ambient brightness; Select high conversion efficiency power supply to improve power conversion efficiency; Low voltage constant current drive IC is selected to reduce energy consumption; Standard process treatment, suitable for long-term outdoor use: tested by a third-party professional organization: the protection grade is up to IP65, which can fully adapt to all kinds of bad rain weather.The structural parts adopt special surface treatment process, which has good moisture-proof and corrosion resistance; The electronic circuit adopts three prevention treatment process to further ensure the dust-proof, moisture-proof and corrosion-proof performance of the product, ensure that the product has strong weather resistance and can be used for a long time in outdoor harsh environment.The equipment supports advanced precision automatic chip mounter, automatic tape braiding machine, reflow welder, wave soldering machine, module aging room, automatic plug-in machine, automatic glue filling machine, automatic foot cutting machine, programmable constant temperature and humidity tester, programmable salt spray tester, simulated transportation shaking table, waterproof test, LED light, color and electrical parameters comprehensive tester, grounding resistance tester Withstand voltage tester, leakage current tester, color luminance meter, testing equipment, electric blast dryer and other testing equipment. Fully ensure that the product is in a stable working state from details to the whole screen.At present, the indoor p2.5 full-color display screen is regarded as a small spacing LED series. The product series of small spacing LED display screen: P1.2, P1.5, P1.6, p1.9, p2.0, p2.5. The small spacing LED display screen can replace the traditional LDP, DLP and LCD splicing screen, which perfectly solves the problem of splicing. In the future market, with the development of small spacing products, it will replace more traditional splicing screens.fqj