How to Save Energy for LED Display Screen, Introduce Some Tips

With the rapid development of society, "energy saving" has become one of the topics that people pay more and more attention to, and the LED industry is no exception. The survey found that led energy-saving products are widely welcomed by the public, such as LED energy-saving lamps, and LED displays belonging to the LED industry should also keep pace with the times, respond to the national call and promote energy-saving and environmental protection products. As we all know, LED display may not achieve the ideal effect in energy saving because of its high brightness, but this does not mean that it must be a high energy consumption product. So how can led display achieve energy saving? Jinan Honglu LED display manufacturer introduces in detail several tips for energy saving of LED display, and hopes to adopt them.

How to Save Energy for LED Display Screen, Introduce Some Tips 1

1. The LED display screen made of environmental protection materials can achieve the purpose of waterproof, dustproof and ultraviolet radiation without glue filling after special processing technology. It has less consumables than the products produced by general process and is more environmentally friendly.2. The brightness adjustment device is designed. The brightness of the application occasion is different under different weather conditions. In order to make the LED display screen achieve the best display effect, which is neither bright nor dark, the LED display screen is specially designed with a brightness 256 level adjustment device and the function of automatically adjusting the brightness according to the surrounding environment, It can ensure that the LED display screen can present a good display effect for the audience under various external brightness environments.3. Constant current noise reduction technology, the LED display driver chip adopts the international advanced LED display special chip system, which is a leading manufacturer in the field of full-color LED display. Combined with the characteristics of the chip, the constant current noise reduction technology is studied and formed to ensure that the influence of other noise source factors such as power supply on LED electronic display screen is reduced to a very low level. Some drive ICs can also save the original 5V voltage to 4.2V to achieve the function of energy saving.

4. The strong convection heat removal system makes the heat dissipation system stable. The LED display screen will release more heat after working for a long time. If the heat is not released in time, it will cause a certain degree of damage to the screen body and affect the normal use of the screen. In order to ensure the normal operation of the display screen in a stable environment, it is necessary to strengthen the heat dissipation system of the LED display screen.5. Power supply, the realization of LED energy-saving display screen mainly starts from the power supply. The existing LED display screen directly adopts half bridge or full bridge high-efficiency switching power supply, coupled with synchronous rectification, with remarkable energy-saving effect. Reduce the power supply voltage as much as possible under the condition of constant current to the driving IC, and achieve better energy-saving effect by supplying power separately through each tube core of red, green and blue.If the selection of LED display screen can start from five aspects: material selection, brightness adjustment, noise reduction treatment, heat dissipation improvement and power supply, then led display screen can also make its own efforts for energy conservation and environmental protection.

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Let's Introduce Several Tips for Energy Saving of LED Display Screen in Detail
Let's Introduce Several Tips for Energy Saving of LED Display Screen in Detail
With the rapid development of society, "energy saving" has become one of the topics that people pay more and more attention to, and the LED industry is no exception. The survey found that led energy-saving products are widely welcomed by the public, such as LED energy-saving lamps, and LED displays belonging to the LED industry should also keep pace with the times, respond to the national call and promote energy-saving and environmental protection products. As we all know, LED display may not achieve the ideal effect in energy saving because of its high brightness, but this does not mean that it must be a high energy consumption product. So how can led display achieve energy saving? Maipu Guangcai LED display manufacturer introduces in detail several tips for energy saving of LED display, and hopes to adopt them.1. The LED display screen made of environmental protection materials can achieve the purpose of waterproof, dustproof and ultraviolet radiation without glue filling after special processing technology. It has less consumables than the products produced by general process and is more environmentally friendly.2. The brightness adjustment device is designed. The brightness of the application occasion is different under different weather conditions. In order to make the LED display screen achieve the best display effect, which is neither bright nor dark, the LED display screen is specially designed with a brightness 256 level adjustment device and the function of automatically adjusting the brightness according to the surrounding environment, It can ensure that the LED display screen can present a good display effect for the audience under various external brightness environments.3. Constant current noise reduction technology, the LED display driver chip adopts the international advanced LED display special chip system, which is a leading manufacturer in the field of full-color LED display. Combined with the characteristics of the chip, the constant current noise reduction technology is studied and formed to ensure that the influence of other noise source factors such as power supply on LED electronic display screen is reduced to a very low level. Some drive ICs can also save the original 5V voltage to 4.2V to achieve the function of energy saving.4. The strong convection heat removal system makes the heat dissipation system stable. Maipu Guangcai LED display screen will release more heat after working for a long time. If the heat is not released in time, it will cause a certain degree of damage to the screen body and affect the normal use of the screen. In order to ensure the normal operation of the display screen in a stable environment, it is necessary to strengthen the heat dissipation system of the LED display screen.5. Power supply, the realization of LED energy-saving display screen mainly starts from the power supply. The existing LED display screen directly adopts half bridge or full bridge high-efficiency switching power supply, coupled with synchronous rectification, with remarkable energy-saving effect. Reduce the power supply voltage as much as possible under the condition of constant current to the driving IC, and achieve better energy-saving effect by supplying power separately through each tube core of red, green and blue.If the selection of LED display screen can start from five aspects: material selection, brightness adjustment, noise reduction treatment, heat dissipation improvement and power supply, then led display screen can also make its own efforts for energy conservation and environmental protection.fqj
Fault Detection and Maintenance of LED Display Screen
Fault Detection and Maintenance of LED Display Screen
2. Check whether there is open circuit, faulty welding or short circuit between output terminals a, B, C and d corresponding to 245 and 138.3. Detect whether there is a short circuit between signals a, B, C and D or whether a signal is short circuited to ground.Note: it mainly detects ABCD line signal.C. When fully lit, one or more lines are not lit1. Detect whether the line between 138 and 4953 is open circuit, faulty welding or short circuit.D. During line scanning, two or more lines (generally multiple of 2, regular) are lit at the same time1. Check whether there is a short circuit between signals a, B, C and D.2. Check whether the 4953 output terminal is short circuited with other output terminals.E. Single or multiple points (irregular) do not light up when fully lit1. Find the control pin corresponding to the module and measure whether it is short circuited to the line.2. Replace the module or single lamp.F. When fully lit, one or more columns are not lit1. Find the pin controlling this column on the module and test whether it is connected to the output of the drive IC (74HC595 / mbi5124,,).G. There is single point or single column highlight, or whole row highlight, and it is not controlled1. Check whether the column is short circuited to power and ground.2. Check whether the line is short circuited to the positive pole of the power supply.3. Replace its drive IC.H. The display is confused, but the signal output to the next board is normal1. Detect whether the STB latch output terminal corresponding to 245 is connected with the latch terminal of the drive IC or whether the signal is short circuited to other lines.1. The display is confused and the output is abnormal1. Detect whether the clock CLK latch STB signal is short circuited.2. Detect whether the clock CLK of 245 has input and output.3. Check whether the clock signal is short circuited to other lines.Note: it mainly detects clock and latch signals.J. Display out of color1. Detect whether the data terminal of the color of 245 has input and output.2. Detect whether the data signal of this color is short circuited to other lines.3. Check whether there is open circuit, short circuit and faulty soldering at the cascade data port between the driving IC of this color.Note: it is easy to find the problem by using the voltage detection method to detect whether the voltage of the data port is different from the normal one and determine the fault area.K. There is a problem with the output1. Check whether the line from the output interface to the signal output IC is connected or short circuited.2. Check whether the clock latch signal of the output port is normal.3. Check whether the cascade output data port between the last drive IC is connected with the data port of the output interface or short circuited.4. Whether the output signals are short circuited to each other or to the ground.5. Check whether the output cable is in good condition.A. The whole screen does not light up (black screen)1. Check whether the power supply is powered on.2. Check whether the communication line is connected and whether there is a wrong connection. (step by step screen)3. The synchronization screen detects whether the communication green light of the sending card and the receiving card flashes; If there is no flicker, check whether the card is inserted properly,4. Whether the green light of receiving card communication flashes. If not, check whether the network cable is loose. If not, check whether the crystal head is pressed well5. Whether the computer monitor is protected, or whether the display area is black or pure blue. (step by step screen)B. The whole unit board is not lit (black screen)1. If several consecutive boards are not lit in the transverse direction, check whether the cable connection between the normal unit board and the abnormal unit board is connected; Or whether the chip 245 is normal,2. If several consecutive boards are not lit in the longitudinal direction, check whether the power supply of this column is normal.C. The unit board does not light up1. Check whether the line pin is connected with the 4953 output pin.2. Check whether 138 is normal.3. Check if 4953 is hot or burnt.4. Check 4953 for high level.5. Check whether the 138 and 4953 control pins are connected.D. Unit board lack of color1. Check whether 245 R.G data is output.2. Check whether the normal drive IC output pin is connected with the abnormal drive IC input pinPower on:(1) Turn on the monitor first, and then turn on the computer host. s(2) Start the LED control panel, enter the screen editing and broadcasting software, open the edited file and run the program list.(3) Turn on the special switch for the display screen to supply power to the display screen.Shutdown:(1) Turn off the special switch for the display first.(2) Exit the special programming software for the display screen and exit all programs.(3) Turn off the computer host and turn off the monitor.(4) Turn off all power connected to the display device.matters needing attention:(1) The operation of the display screen must be carried out in strict accordance with the on-off sequence.(2) When the display screen is running, do not plug and unplug the system board and all equipment connected to the display screen.(3) The computer dedicated to the display screen is not allowed to play games and install software not related to the display screen to prevent viruses from invading the computer so as not to affect the normal operation of the display screen.
Making Tutorial of Rotating LED Display Screen
Making Tutorial of Rotating LED Display Screen
Step 1: components and partsArduino NanoLED red 7Resistance 330 ohms 8SWITCH DPDT 1Battery 9 V 1Battery holder 1Infrared LEDphotodiodeResistance 10KPCB copper clad foil / zero PCBPinPower pin motor connectorStep 2: how to rotate the LED display"POV display" or "rotating LED display" is just an eye deception. Our eyes can't distinguish very fast movement. In this "POV display", the LED light band rotates very fast (more than 500 rpm), and the LED pattern is composed of letters, so we can see words or letters.In GIF pictures, you can see and understand how the rotating LED display works. Suppose we want to display the letter "a" on the POV display screen. As shown in the figure, it is a GIF image. Some LEDs in the first column emit light, and the LEDs emit light according to the letter. After a delay of several milliseconds, the second column LED lights up and the speed of the LED is very fast, so we can't distinguish the changes, we can only see some letters.In the rotating LED display, the Arduino nano is used as a control unit. Arduino is a microcontroller board that controls LEDs and makes flashing patterns. A pair of IR LEDs (infrared LEDs) and Pd (photodiodes) are used to determine the starting point of rotation.When the circuit of POV display crosses the white strip, the photodiode detects it and starts the LED strip in alphabetical order. Each time it forms the same pattern so that we can clearly see the letters.Step 3: circuit for rotating the LED displayEagle BRD file: please visit our websitehttp://clgproject.blogspot.in/2017/11/rotating-leddisplay-is-amazing- and-very.htmlThe circuit of POV display is very simple, but we need to make it as compact as possible because it runs at a high speed (greater than 500 rpm) and the motor cannot handle heavy and large circuits, so I designed the circuit on Eagle CAD software, which will make the circuit very compact. If you are good at PCB etching, you can make your own PCB. If you want to learn PCB etching, please click here. If you intend to use the circuit given below for PCB, or you can buy it from us. If you are interested, please contact us. If you are not familiar with PCB etching Please rest assured that you can use the circuit given below and make the circuit on the zero PCB.In the POV display circuit, seven LEDs are connected to Arduino pins (D6 to D12) through a resistance of 330 ohms. The photodiode is connected to VCC and GND through a 10k ohm resistance, and the connection point of the photodiode and the resistance is connected to the A7 pin of Arduino. The IR LED is connected to VCC and GND through a resistance of 330 ohms.Step 4: CodeClick here to get the code
How to Solve the Problem of Frequent Tripping of the Total Leakage Protector of LED Display Screen
How to Solve the Problem of Frequent Tripping of the Total Leakage Protector of LED Display Screen
1. Unreasonable layout of leakage protectorDue to the particularity of the installation site of LED display screen, such as wiring error, line damage, damage of leakage protector in the switch box, failure of some electrical appliances to pass through the switch box, as well as the inevitable misoperation and refusal of leakage protector itself, and the failure to arrange the leakage protector according to the actual power consumption, the total leakage protector tripped frequently.In this case, in addition to strengthening the management, it is also necessary to reasonably arrange the leakage protector according to the actual situation from the perspective of technology. The leakage protector on the main power supply of the incoming line can be mainly used as the general protection against electrical fire hazards and electrical short circuit, and also as the backup protection for each small leakage protection range. Its rated leakage action current can be selected between 200 500mA, and the rated leakage action time can be selected as 0.2 0.3s. In this way, the impact of surge voltage, surge current and electromagnetic interference on the total leakage protector can be greatly reduced, and the selectivity and reliability of the action of the total leakage protector can be improved. If the secondary leakage protection within each leakage protection range can be in an effective protection state, the frequent tripping probability of the total leakage protector on the construction site can be greatly reduced.2. There is no effective secondary or tertiary leakage protection within the protection rangeThe final leakage protector in the switch box is the main protection of electrical equipment. If the final leakage protector is not installed, damaged or improperly selected, it may cause frequent tripping of the superior leakage protector. Because there are many metal conductors and many wire joints in the LED display screen, if the wire insulation is not very good, it will lead to frequent leakage; Some have also added some sockets. In many cases, leakage protectors are not installed, which often causes leakage. Only by forming an effective secondary or tertiary leakage protection mode within each protection range can the frequent tripping of leakage protector be effectively reduced.3. Leakage protector itself has certain limitations(1) The current leakage protector, whether electromagnetic or electronic, adopts magnetic induction voltage transformer to pick up the leakage current in the main circuit of electrical equipment. Three-phase or three-phase four wires cannot be arranged in the magnetic ring completely balanced. The three-phase power load of LED display screen can not be completely balanced. Under high current or high overvoltage, a certain electromotive force will be induced in the magnetic ring with high permeability. If the electromotive force is large to a certain extent, it will cause the leakage protector to trip. As the leakage protector with higher rated current adopts a relatively large magnetic ring, the leakage magnetic flux generated is also relatively large, and the leakage current should overcome the magnetization force of the magnetic ring itself, resulting in the higher rated current, lower sensitivity and higher rejection rate of the leakage protector actually used.(2) The leakage protector has an action uncertain area between the rated leakage action current and the rated leakage non action current. When the leakage current of the leakage protector fluctuates in this area, the leakage protector may trip irregularly.4. Unreasonable selection of leakage protector(1) The rated leakage action current used in the switch box exceeds 30mA, or the leakage protector exceeds more than twice the rated current of electrical equipment, or the leakage protector with time delay is selected. Due to the improvement of rated leakage action current or the decrease of protection sensitivity, the last level leakage protector does not act in case of leakage fault, The superior leakage protector may act.(2) When the LED display is powered on, the starting current is often large, which may trip the leakage protector. Therefore, power on the box of the display screen in batches as much as possible. In addition, electromagnetic leakage protector which is not sensitive to surge overvoltage and overcurrent shall be selected generally; Or select an electronic leakage protector 1.5 2 times larger than the rated current, but as the final leakage protection, the rated leakage action current shall not be greater than 30mA.
How to Solve the Fault of LED Display Screen
How to Solve the Fault of LED Display Screen
How to solve the flower screen fault of LED display? There are many reasons why the flower screen of full-color LED display can not be displayed normally. Here is a summary of how to solve the flower screen of full-color LED display.If the new screen is powered on, it may be that the control card settings are not scanned correctly, or the cable is not inserted correctly (check the cable from the control card to the first board). This problem will also occur if the 5V power supply is connected incorrectly.If this phenomenon is suddenly found after using for a period of time, in addition to the failure of the control card, the biggest possibility is that the board is flooded and burns the chip or power supply.Also, you can try a display connected to a DVI interface. First, check whether the DVI output port of the graphics card has a normal signal. The DVI interface resolution of general lingxingyu card is 1024 * 768. The reason for the LED display screen may also be the problem of the graphics card or the driver. Try to unplug the network cable of the receiving card behind the display screen and press the debugging button on the receiving card to see whether the screen body scanning is normal.In addition, other reasons for the flower screen of full-color LED display are also provided for your reference:1. LED display flower screen cannot be displayedSolution: check whether the power supply of the electronic display screen is normal and whether there is 220V strong current input2. The display of LED electronic display screen is abnormal, and the flower screenresolvent:(1) Whether the parameter setting of LED control card is correct and whether there is signal transmitted to the LED control card of electronic display screen;(2) Check whether the communication line communicates normally and whether the LED control card has signal input;(3) Whether the 5V power supply of LED control card is normal;3. Part of the screen body of the electronic display screen is abnormal, such as black screen and flower screenSolution: check whether the screen power supply with abnormal display works normally; Signal transmission line fault; Single module failure of screen body.A. There is a problem with the output1. Check whether the line from the output interface to the signal output IC is connected or short circuited.2. Check whether the clock latch signal of the output port is normal.3. Check whether the cascade output data port between the last drive IC is connected with the data port of the output interface or short circuited.4. Poor heat dissipation of the chassis leads to the rise of the temperature of the graphics card.Solution: eliminate the heat dissipation problem.Check whether the fan operates normally, add oil to the fan, clean the dust in the chassis, and eliminate the fault after solving the heat dissipation problem.5. Reinstallation of the system, graphics card or display does not support high resolution.resolvent:(1) Restart the computer, press F8 continuously, in the Advanced Startup menu, select "safe mode" and enter to log in to the system, then enter the display setting under windows, select the 16 color status, click the "apply" button and click the "OK" button.(2) Restart the computer. In the normal mode of windows, enter the device manager, delete the graphics card driver, and restart the computer.
Analysis of Six Key Technologies on How to Ensure the Safety Performance of LED Display Screen
Analysis of Six Key Technologies on How to Ensure the Safety Performance of LED Display Screen
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.
How to Use AT89C51 Single Chip Microcomputer to Control the Circuit Design of LED Display Screen
How to Use AT89C51 Single Chip Microcomputer to Control the Circuit Design of LED Display Screen
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.
Four Technologies to Solve the Problem of LED Display Screen
Four Technologies to Solve the Problem of LED Display Screen
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!
Design Requirements of LED Display Screen
Design Requirements of LED Display Screen
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.
Research and Discussion on Common Problems of LED Display Screen
Research and Discussion on Common Problems of LED Display Screen
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.
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