New Yasun series display in addition to the use of white balance adjustment and other mature technology is also integrated into the industry a series of the latest display technology: mobile compensation technology, image frequency processing technology, anti-γ correction, color coordinate space transformation technology, adjustable current drive and linear modulation group pulse scanning mode, soft-start power supply, environmentally adaptive brightness adjustment, constant-current drive, and so on. Realize the majority of users high brightness, high stability and high definition display dream.
3.1, digital grayscale control technology
The human eye can identify three kinds of primary colors - red, green and blue - resulting in 150-200 shades. If you use bits to describe color, there are only 4096 colors, and this color can only achieve a soft posting effect. In order to get the full color photo effect on an LED display, it must be able to produce 4096 shades for each of the base colors. Each base color takes up 12 bits of information, for a total **** of 36 bits required. If all 3 colors were allowed to produce all 4096 possible variations, 68 billion color tones would be available.
The new Ascent series uses a unique PWM pulse width modulation technique to achieve grayscale control. Unlike the general technique of changing duty cycle, it uses the difference of changing the number of pulses to realize 4096 levels of grayscale control. It can distribute the LED lamp driving time more evenly, thus the grayscale control is more effective and can extend the LED lamp life, realizing the digital grayscale control.
3.2, open anti-γ correction
The human eye on the instrument to measure the same level of visual difference in the feeling is not the same such as: the human eye is sensitive to the low brightness level difference, but the high brightness level difference can not be clearly differentiated, which requires the LED light-emitting device for visual nonlinear correction: compression of low brightness level difference, expand the high brightness level difference, so that the actual display of gray level difference in line with the human eye Physiological sense of the gray level.
The new YASUN series display rejects the solidified anti-γ correction technology and realizes the open anti-γ correction technology. This means that users can select the appropriate anti-γ correction according to their own preferences and different environments.
3.3, video processing technology
In order to achieve the best display effect of LED display, we according to the principle of chromaticity, image processing technology and LED light-emitting components of the characteristics of the design and use of the world's most advanced video processing technology, and to make it used in my company's products, and get the majority of users praise.
①Motion Compensation Technology
Video image signal due to the large amount of information, such as in the display screen broadcast soccer game screen, there is often a trailing or jagged phenomenon, when the image becomes blurred can not watch. As we know, a complete video picture is composed of odd field (Odd Field) and even field (Even Field), this is because when the soccer ball quickly through the screen, in fact, in the odd field and even field will produce 1/50 (PAL) or 1/60 (NTSC) difference. When the combination of odd and even into a single picture, the soccer ball trailing or jagged phenomenon, for this reason, the company in its production of LED display video acquisition circuitry at the back end of the special added image processing circuit, the interlaced screen (Interlace) into a non-interlaced screen (Non-interlace), whether it is to show the exciting racing scene, or display static The picture is very clear and stable.
② Image Frequency Processing Technology
We all know that the ordinary color TV screen refresh frequency of 50Hz, when we watch TV, we will feel the TV screen will appear a slight jitter, if the video signal is not processed by the technology directly to the LED display, the LED screen will be more wobbly, especially the signal source is not good, the display will not be tolerated. To this end, my company uses a unique picture storage technology, with my company developed special image processing chip with independent intellectual property rights, so that the LED display screen refresh frequency of 240HZ, the picture is more stable, no sense of shaking, the display effect is significantly better than other companies' products.
③ Intelligent Module (IM) technology
Intelligent Module (IM) technology can be adjusted to drive the current and linear modulation group pulse scanning mode, not only to ensure that the LED device stable working point and stable feed current and to avoid the LED device due to overcurrent, overvoltage - damage to the protection, effectively improve the life of the display; Intelligent Module (IM) technology also provides a reliable and reliable control of high grayscale technology. High grayscale control technology provides a reliable circuit guarantee, we imagine that if the LED device work point is not stable, that you produce grayscale will fluctuate up and down, the direct consequence is that although there are 4096 levels of grayscale, due to fluctuations, the picture effect is not clear, gray, no sense of depth, this is the current market, although many companies have 4096 levels of grayscale display screen, the display effect is still very poor! Reason. The use of intelligent module (IM) technology can make the LED display grayscale control more delicate. ④ Color correction technology and data processing technology, making the display screen color more vivid and realistic.
⑤ Proprietary visual non-linear correction technology has excellent corrective effect on visual non-linear distortion caused by digital image signals on LED display devices and the human eye's visual non-linear response to high brightness and low brightness.
6. The system hardware sets the automatic brightness adjustment function, and the software sets 64 levels of adjustable brightness. Multi-level brightness adjustment measures to meet the user's needs for fine-tuning the brightness to ensure that the display screen is soft and comfortable.
⑦ Flexible and diverse input interfaces provide customers with protection. Whether it is S-VEDIO, VEDIO or VGA signal, can be directly broadcast on the LED screen, greatly facilitating the customer. Unlike other companies must use the component input signal, broadcast a program also needs to be converted, otherwise it can not be played.
8 The system is set with different color temperature adjustment function, can meet the user's different color preferences, and the atmosphere of the performance environment to play a role in rendering the role of highlighting.
3.4, modular, intelligent technology
① Soft-start power supply system can be controlled by the software so that the current consumption of the large screen rises slowly, to avoid bursts of high current impact on the power supply system.
②Adaptive brightness adjustment system makes the screen brightness automatically adjusted with changes in ambient light intensity to ensure that the visual effect of the large screen is soft and clear. It realizes the dynamic real-time control of the display.
③ The screen status monitoring system combined with remote control software realizes the monitoring, fault detection and automatic protection of the large screen.
④ Module (IM) local brightness and chromaticity adjustment technology, which can realize point-by-point adjustable brightness, and finally realize consistent brightness and color of the whole screen.
⑤ The playback software with multiple input interfaces allows users to easily program and modify the video images, pictures and texts to be played by themselves.
3.5, the system software
A good control system can not be separated from the excellent software support, HS-LED system software for the LED display of special software, and the big screen in close cooperation, the system set of graphic production and playback, art font production and playback, video playback, three-dimensional animation playback and other powerful functions in one, the interface is beautiful, the whole Chinese menu, easy to operate, the overall design idea is to provide a simple and convenient to play the video images and text. The overall design idea is to provide a simple and convenient and interactive program production and playback environment, its functions can be freely combined by the user, cyclic playback and automatic switching, and the implementation of the respective timing, fixed-speed, display a variety of ways, with good expandability and reliability.
① Powerful: The system can access a variety of signal sources, large amount of information, strong functions. Through the keyboard, mouse, scanner and other different input methods to enter text, images, tables and other information, images can be modified by the software, text overlay, select a variety of fonts, font, color, and can be zoomed in, zoomed out, copy and other editing processes, insert a variety of ways to display the various scheduling can be freely combined, timing, to achieve the desired display effect.
② Friendly interface: full Chinese menu, human-computer dialogue type, easy to operate, program production and playback with a mouse click.
③ Chinese system: this software provides five strokes, pinyin, area, English four commonly used input methods, the user can choose the input method according to the need, in WINDOWS, Kingsoft and other Chinese systems, such as any input text files can be directly called, provide a variety of fonts, glyphs, and provide in the word in a variety of directions on the edge of the modification, the word color, the edge of the color can be chosen arbitrarily, the word attributes have demonstrated that customers can feel intuitively There is a demonstration, customers can intuitively feel whether the selected attributes are appropriate to achieve the best artistic effect.
④ Rich display modes: Different display modes make every pattern and monotonous text on the screen more attractive and increase the dynamics of the screen. The software provides many different display modes, such as: loop, open curtain, roll-up curtain, center-open, blinking, rotating, fading, and flying display.
⑤ Easy playback control: the functions of this software can be combined at will to create a script for playback, which can be timed to cycle through the playback, play in a single step, or pause at any time to replay from the pause, and provide the playback time for ease of use.
⑥ Information release and production: can be controlled by multiple computers.
⑦ Electronic clock: real-time display of the year, month, day, week and time.
⑧ automatic playback: a variety of display content, display mode, signal source can be conveniently and arbitrarily programmed by the customer, modify at any time.
⑨ Integrated environment, menu form, flexible operation.
4, quality and reliability assurance
4.1, the display body
Display body is mainly composed of display unit board (including the display driver circuit board), power supply and frame.
Unit module is a display unit composed of LED modules, LED modules are planted with light-emitting diode cores. Among the full-color display of light-emitting diodes have three basic colors: red, green, blue.
Display driver circuit board consists of large-scale integrated circuits and 2 layers of PCB boards, and at the same time bear the responsibility for the transmission of display data and drive.
Display special DC switching power supply for the display provides a constant, accurate working voltage. This switching power supply has strong voltage stabilization characteristics, the output voltage does not change with the change of the load, and has over-voltage, over-current, overheating, anti-current surge and other protection functions, is the display system is normal, stable work of the basic guarantee.
4.2, eliminate the mosaic phenomenon
Mosaic phenomenon causes:
The same display selected different specifications of the grade of the LED.
Because of the flatness between the modules can not guarantee the absolute consistency, and at the same time, due to the small viewing angle of the LEDs in the past, thus resulting in the module relative to a certain point of observation of the brightness is not consistent.
Aiming at the above reasons, our company made the following solutions:
Our company strictly stipulates that each module in a product is selected from the same brand, the same model, the same grade of LEDs. Before splicing and forming, parameter test is carried out for each unit module, and parameter test is carried out for each pixel point in the unit board by using the special instrument to form the whole LED control parameter of the whole screen, and then after the logic operation, the LED control parameter is generated. And then after the logic operation, produce control data sent to the unit module, after such processing can eliminate the LED parameter discrete characteristics produced by the phenomenon of gray scale inaccuracies. Improve the flatness of the display, the flatness between adjacent modules reached the highest level of industry specifications, while the project selected the world's most advanced high-brightness large viewing angle LED. fundamentally eliminates the mosaic phenomenon due to the unevenness between the modules. As we all know, from the characteristics of the human eye on the local unevenness is easy to detect, but the whole size error is very difficult to find. Therefore, it is necessary to ensure that there is no sudden change in the height and pixel spacing of the display. The company takes the scientific method, from the design, processing, installation, commissioning of each link with strict process measures to ensure that the dimensional accuracy of the display, in order to ensure that the display has a good appearance of the viewing effect, flatness, flatness, verticality and horizontality and so on.4.3, the system debugging program
In order to improve the quality of LED display, improve work efficiency, the new Yasheng company has developed a standardized debugging workflow for this project, debugging the general steps are:
Materials
Determine the debugging site, placing the module
System installation, connection
Power on debugging
Aging
Self-inspection
Reporting
Delivery
Wiring
Module assembly
Equipment, system connection
Testing, debugging, aging
Training
Delivery
Steps of the commissioning process specific specifications are as follows
★Preparing materials
Preparation of materials should be carefully read before the production notice issued by the Ministry of Commerce, according to the specifications, size of the display, as well as other incidental special requirements clearly specified in the production notice.
Print the list of material preparation, refer to the similar projects in the past and check whether there is any omission.
Collecting materials should be categorized and labeled, easy to damage things should be marked significantly, after collecting materials should be checked against the list of materials to ensure that there is no error. After checking the completion of all packages should be numbered, in order to find.
The software program used to prepare the screen and the chip that needs to be written beforehand should be tested.
★Determine the debugging site, placing the module
According to the size of the module to choose the power supply is convenient, reliable and no interference with the site.
Commissioning sites should have sound anti-static facilities.
Module debugging is completed, the placement should be protected to prevent damage to the module.
★System installation, connection
Prepare the control system, 5V, 220V bus, debugging communication lines.
Place the module to be debugged, open the back cover to connect the signal line, as well as 5V, 220V power supply bus, connected to the completion of the following matters should be carefully examined:
control 5V power supply with or without short-circuit phenomenon; drive the power supply with or without short-circuit phenomenon; 220V input fire, zero resistance between the normal; DC power supply ground and the enclosure whether the short-circuit; 220V fire, zero is short-circuited with the shell; each terminal one by one with a screwdriver fastening check again; each module shell ground is connected together, signal ground is connected together;completion of the above checks, check the connected 220V power supply output voltage is normal, the switch is reliable, and then disconnect the power supply box, connecting the module debugging the 220V power supply.
★Power on debugging
After carefully completing the above check items, you can power on debugging.
Precautions in the debugging process: A. with anti-static bracelet; B. can not be electrically plugged and dialed components; C. Replacement of the control board or swap communication lines need to be turned off the module and the computer's power supply; D. There is a flywire need to be welded reliably and glued to fix; E. re-replacing the light board or the light like the screws should be tightened, and to ensure that the original smoothness, clearance.
The faults found during the commissioning process should be carefully analyzed, with detailed records, such as special more serious problems need to be reflected to the department head in a timely manner.
The debugging results should ensure that the module display black and white, solid color test, no runaway point, no continuous bright, diagonal test, no flicker, gray scale incremental test without jumping, playback of animation without gaps.
After the completion of the debugging, the module shows all white, the voltage is adjusted to the specified voltage, the error should be (-0.01 ≤ N ≤ +0.01)
Power off, dismantle the adjusted module, you need to check the closure of the back cover with or without the pressure line; the box body with or without the iron filings, solder debris, check and clean up after the tightening of the back cover screws, carefully moved down to the placement and marking.
★Aging
The content played during aging should ensure the effect of aging.
The start time of aging should be fully recorded.
The malfunction phenomenon in the aging should be recorded on time, and the reason and law should be carefully analyzed after the synthesis, and the solution to the problem should be sought thoroughly.
Modules with problems in the aging, return to make a mark, and enter the second aging, the failure no longer occurs, is considered to be qualified.
★Self-inspection
After aging, the module with no faults can enter the self-inspection. Self-test check items are as follows:
Module all screws connected to the place with a screwdriver to check whether the screws are tight and reliable. (A. whether the power supply is fixed reliably; B. whether the terminals are clamped, whether there is the possibility of collision; C. whether the screws of the light board or like lights are tightened, whether there is no leakage, whether the waterproof ring is clamped, whether there is no leakage; D. whether the signal line is inserted and connected neatly and reliably; E. whether the power line connection has the possibility of short-circuiting the potential danger.)
Whether the appearance of the module has abrasion, extrusion deformation, rupture place.
Whether the assembling of the light board (or like light) is flat and the gap is even.
Whether the module is even in color when displaying solid color or full color.
★Inspection
Fill out the inspection form and apply for inspection.
Assist the QC department to inspect.
Rework the unqualified products and report for inspection for the second time until the QC inspection passes.
★Shipping
List the detailed packing list in duplicate. One packing, one filing, the requirements of the list of goods in line.
Labeling of perishable items to ensure that the material packaging safety.
Notify the person in charge of the site in writing of the location of the module markings, their meaning and reasons.
Notify the person in charge of the site in writing of the display gamma correction three-color ratio and index and drive voltage, profile, color temperature, color coordinates, brightness.
★Wiring
Survey the site conditions, determine the length of the wiring, route, difficulty, determine the wiring hours.
Check the specifications of the wire provided, the number of whether or not to meet the standards proposed by the project, if there is a problem, timely report to resolve it.
The wiring process should be avoided: A. excess wire concentrated in the middle of the wiring channel to increase the communication distance; B. to prevent the line to play hard bends, to ensure that the line is smooth; C. to prevent the wiring process of wire skin breakage, and try to avoid the middle of the phenomenon of docking; D. easy to cause the line breakage of the site should be protected.
★Equipment, system connection
Check the number and classification of power buses and the number and classification of signal lines.
Connecting the power bus requires reliable plugging and smooth routing.
Connect the signal lines, requiring reliable plugging.
Fixed control power supply, control board, requires reasonable layout, safe and reliable.
Connect the lines of modules of the bus, reasonable distribution of load, distinguish the line color, the richness of the wire diameter in line with the power supply line diameter selection standards.
Determine the location of the electric control box, connect the electric control box. Requirements: A. User units are required to provide an electrician to assist in receiving electricity; B. Users who do not assist personnel before receiving electricity must understand the direction of the line to ensure that the upper end of the power supply has been cut off before operation. C. Receiving electricity should be in strict accordance with the requirements of the electrician to ensure that each place of the fastening of a reliable, no break, open, short-circuit potential hazards. D. Receiving electricity should be dialed out of the various ways of insurance in order to avoid the accidental addition of power accidents occur. E. Electricity should be connected to the end of the first before the plug insurance, measurement of the power supply to the power supply to the power supply. E. After connecting the electricity, we should first measure whether the voltage of each circuit sent to the screen meets the requirement of 220V (±10V) without plugging in the insurance F. After connecting the electricity and measuring, we should disconnect the main gate, plug in the insurance, and lock the distribution cabinet to prevent the outsiders from moving by mistake.
Placing the control room equipment, A. Carefully placed, should be requested by the customer, a reasonable layout; B. Unpacking and checking for missing accessories; C. Various types of instructions disks, CD-ROMs and other equipment information collected in a timely manner to avoid loss.
Connection and installation of equipment.
Ensure that the equipment is connected reliably and the plug-in screws are tight. The power supply voltage of the equipment is stable.Welding communication line connector, requirements:
reliable welding, no false welding, no short-circuit phenomenon. Shell installation formal, intact, screws are tight. Wireless skin places wrapped carefully and safely.System ground connection, grounding; frame grounding; lightning grounding.
★Testing, debugging, aging
Testing: In addition to the above "self-inspection" mentioned in the test items carefully after the test, and then test whether the system grounding is reliable;
Debugging refer to the above "power commissioning".
Aging refer to the above "aging".
★Training
Switching screen step-by-step training: A. Written screen and equipment power supply, orientation, switching steps. B. Written provision of misuse of the fault phenomenon, the solution.
Software training: A. commonly used large screen playback software training; B. large screen management software basic application training; C. simple text animation training.
Customer confirmation of training is required.
★Delivery
Display after aging has reached the contract requirements, the project manager should be organized by the relevant personnel to accept the display.
The acceptance report is made by the project manager.
4.4, environmental protection
Every enterprise must have a strong sense of environmental protection in order to protect our environment. New Yasheng company has long been to ISO14000 environmental management international standard of basic elements to manage the enterprise, emphasis on pollution prevention, continuous improvement; require the whole process of control of the organization's activities; for the enterprise's important environmental positions, the establishment of operating procedures to control; pay attention to cultivate a good awareness of environmental protection of each employee; and will be some environmental protection system into the company's ISO9001 management system And incorporate some environmental protection systems into the company's ISO9001 management system, from design, production to construction as far as possible to implement the ISO14000 environmental management international standards. Specific measures include:
★Control of air pollution
Comprehensive selection of environmentally friendly materials in the design, for the ISO14000 environmental management through the international standards of suppliers, to give priority to.
★Control noise
Select all kinds of low-noise devices, such as fans, air conditioners, power supplies
★Energy saving
Adopting low-voltage constant-current drive technology makes the current balanced and the whole screen with low energy consumption;
Selecting the high-efficiency power supply of Changzhou Chenglian Company, the conversion efficiency can reach 80%.
4.5, device screening
In the LED display, light-emitting device performance quality directly affects the display of the display effect and display function of the normal play. My company in the display of light-emitting device screening, focusing on the following points:
① Supplier qualification approval: must be through the ISO9000 quality certification enterprises / must have more than 5 years of good business records / the last 3 years without any customer complaints about product quality issues.
② quality appraisal: (I choose all the components must be on the market for more than 3 years of normal use, to ensure that there is no quality problems)
③ LED lamps selection: Nowadays, the LED market LED lamps price accounted for more than 40% of the whole screen, so many manufacturers in the LED lamps to do the article. In the selection of LED raw materials, our company on the supplier's strict selection, each finished light-emitting diode's internal chip are our designated chip manufacturers, the choice of larger chips. Today there are two situations on the market, the first is to choose the same brightness of the small chip, such a chip high brightness is not stable, poor electrostatic protection, attenuation is very irregular, mounted on the screen in the aging of the phenomenon of 72 hours will appear dead spots, dark spots. The second situation to choose the same type of small chip, in order to ensure the stability of the brightness, by increasing the working current to improve the brightness, the normal current below 20mA increased to 30mA, or even higher, such a situation in the aging of 72 hours is basically do not see any problem, but will seriously affect the service life of the LED lights, the effect of a short period of time may also be possible, but the time long display screen Brightness attenuation is very large, coupled with uneven tube attenuation, and finally make the whole screen pixel uniformity is poor, uneven color, mosaic phenomenon, greatly affecting the display quality of the display. When the situation is serious, the current regulation exceeds the chip's carrying capacity for too long and even a large number of dead lights, so that the display prematurely scrapped. The benefits of the use of large chips are mainly reflected in the brightness, attenuation, and anti-static ability, such a chip to ensure that its uniformity is basically the same, the brightness of the light-emitting diode is consistent, the attenuation is far less than the same brightness of the small chip, the production of anti-static ability is greater than that of the equivalent of the small chip, which improves the service life of the display of the Department of Division I, reduces the brightness of the lamp is not uniform attenuation of the rapid change caused by the Mosaic phenomenon. Perhaps tomorrow, the small chip can also solve such a problem, on today's LED market, the superiority of the large chip is much higher than the small chip.
In the choice of brightness, in strict accordance with the national brightness ratio R:G:B - 3:6:1. indoor screen brightness guaranteed ≥ 1000mcd, outdoor screen brightness ≥ 6000mcd, does not affect the normal life of the lighting system. The brightness of the outdoor screen facing the sunlight ≥ 8000mcd reduces the phenomenon of not being able to see the display caused by strong light. In the choice of single and dual-color lamps, to ensure that the angle of view of the lamp is greater than 70 ° more conducive to different angles to observe the effect of the whole screen. Full-color lights, luminous angle greater than the industry's requirements of 100 °, so that the screen's viewing angle is more open, the choice of waveforms in strict accordance with industry standards, such as the figure:
To make the three-color waveforms basically keep the overlap, from the side to observe the screen without obvious color deviation phenomenon, but also for the adjustment of the white balance to provide strong and favorable support. Some manufacturers use a two-color red and green, full-color blue lights, although in the front to observe the whole screen can not be seen what the problem, can be observed from a slanting angle of 45 ° to observe the words obviously uneven chromaticity, a large number of dark spots phenomenon. Some single red manufacturer chip is not a very formal chip, the production of light-emitting diode attenuation is much greater than the regular full-color chip, only a few months, it can be clearly found on the screen from the screen color temperature is very high, the light is relatively cold phenomenon, resulting in visual light pollution, and even more 1 month to the brightness decreased by 30%.
In terms of single-tube current, (for example, P10 outdoor full-color, we use the current to maintain the R=14mA.G=11mA.B=10mA,) my company display single-tube current is strictly controlled by 15mA or less, to stop the use of high-current (such as: R=24 mA G=21 mA B=18 mA) to improve the brightness of the whole screen method, which greatly prolongs the light-emitting diodes, and uneven attenuation of light-emitting diodes. life, and uneven attenuation caused by the mosaic phenomenon.
Based on the above information, the parameters provided by our company are different from those of general manufacturers, so the price will be higher.
④Display IC selection: IC selection is another core point of the display, our company mainly selects Taiwan Polycrystalline, Taiwan Dot Crystal, Japan Toshiba, Holland Philips, China Zhongqing and other international famous brands. The IC of these companies can ensure that their products and their proposed manual parameters are consistent. And some other companies imitate these brands to the specifications of the book parameters are deliberately raised to compare, and even simply to imitate the chip silkscreen also played on these companies logo. To our company's use of the chip are after rigorous testing, before mass production, unlike some companies in the industry only to see which one is cheap to choose which one, make the screen no matter how good or bad are going to be out to customers, customers as an experiment to use. This will be found in the process of using many problems such as display due to uneven voltage distribution between the IC tube mosaic phenomenon, the display appears on the virtual bright, bright, dark, anti-static point ability is poor, and worse chip often burned out, serious damage to the interests of customers.
⑤Power supply and power cord: the power cord and the use of power supply is also a very important part of the life of the display. My company uses the power supply and power cord for the domestic famous brand through the 3C mandatory certification, which contains various indicators are reached is the national standard. Some companies use the power supply and power cord completely failed to meet the standards. For example, the appearance of the power cord looks qualified, but the copper content of the power cord is far less than the standard, and some even increase the outer skin of the power supply is very thick core is very thin, in order to deceive customers, and more power core using copper-clad iron, copper-clad aluminum. This makes the power cord can not reach the power to carry, so that the wire heating, voltage drop on the wire increases, the display module voltage drops a great waste of power efficiency and affect the normal work of the display. And our power cord completely use the national standard copper wire, power supply selection is also in the display of the maximum power conditions reserved 20% of the space. So that the power supply voltage drop of each module in the box is controlled at 1%, and the power supply works very stably. While other companies calculate the use of power supply and power cord is calculated on the basis of its average power, so that the power supply overload, so that when the screen reaches the peak when the box between the module voltage drop is very large, the voltage difference between the modules is very large, the power supply for a long time to work in the full-load conditions burn power supply chances increase greatly. So that the display chip due to insufficient power supply affects the light-emitting diode operating current, so that the display appears uneven color, mosaic and other phenomena. Coupled with the line and components of the aging of a long time its effect is getting worse and worse, and finally led to the whole display appeared serious color unevenness, serious mosaic phenomenon. And our company in advance to avoid the emergence of this problem.
6 PCB boards: all of our LED display PCB boards for FR-4 A2 copper-clad boards, this level of industrial electronics needs. There is a very good price-performance ratio. Its performance is second only to FR-4 A1 level military products with the plate. According to observation and analysis, similar products are mostly FR-4 B-grade low-grade sheet. These low-grade plates cause many unexpected problems. In terms of welding, low-grade plates can easily lead to pads and lines off, pads not on the tin and other issues. In terms of electrical performance of the same line with different plates circuit boards have a great difference in electrical performance, reflected in the display on the uneven voltage distribution, transmission interference, transmission distance shortening, the display appears to be a stray point, and other issues.
7 kit: mask fixing screws using inlay, from the mask surface lock screws, and the use of stainless steel material screws, anti-aging effect is good, the entire PC high-strength raw materials plus fiber 10% made of high and low temperature testing, rapid aging destructive test.
PC material features:
☆Surface resistance of 106 ~ 108Ω, with stable anti-static properties.
☆☆Super impact resistance and high temperature performance.
☆Anti-static performance is not easily affected by temperature and humidity.
☆Superior chemical resistance and abrasion resistance.