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LED quality assurance eight technologies
To produce a good quality LED display, you need to do a good job in the following aspects:
1, anti-static LED display electronic display assembly plant should have good anti-static measures. Special anti-static ground, anti-static floor, anti-static soldering iron, anti-static table mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cutting machine) are all basic requirements, and should be regularly tested with a static instrument. .
2. Driver circuit design The layout of the driver circuit board driver IC on the LED display module also affects the brightness of the LED. Because the output current of the driver IC is too far from the PCB, the voltage drop of the transmission path will be too large, which will affect the LED's normal operating voltage and cause its brightness to decrease. We often find that the brightness of the LEDs on the four sides of the LED display module is lower than in the middle. This is the reason. Therefore, to ensure the consistency of the display brightness, it is necessary to design the drive circuit distribution map.
3, the design current value of the LED's nominal current is 20mA, it is generally recommended that the maximum use of current is not more than 80% of the nominal value, especially for small screen spacing, due to poor cooling conditions, but also reduce the current value . According to experience, due to the inconsistencies in the attenuation speeds of the red, green, and blue LEDs, the current values ​​of the blue and green LEDs are purposely reduced to maintain the consistency of the white balance after the display has been used for a long time.
4, mixed lights of the same color with a different brightness of the LED lights need to mix, or in accordance with the discrete rules of the plug-in lamp design to insert the lights, in order to ensure the consistency of the brightness of the entire screen of each color. If there is a problem in this process, there will be inconsistencies in the local brightness of the display, directly affecting the display effect of the LED display.
5, control the verticality of the lamp for the direct-insertion LED, the furnace must have enough technology to ensure that the LED is perpendicular to the PCB board. Any deviation will affect the brightness consistency of the LED that has been set, and the color patches with inconsistent brightness appear.
6, over-wave soldering temperature and time must be strictly controlled wave front welding temperature and furnace time, it is recommended that: preheating temperature 100 °C ± 5 °C, the maximum does not exceed 120 °C, and the preheating temperature rise requires a smooth, welding temperature For 245 °C ± 5 °C, welding time is recommended not to exceed 3 seconds, after the furnace avoid vibration or shock LED, until the return to normal temperature. Wave soldering machine temperature parameters to be regularly tested, which is determined by the characteristics of the LED, overheating or fluctuating temperature will directly damage the LED or cause LED quality problems, especially for small size such as 3mm round and oval LED.
7. Weld control LED display LED is often not bright, there are often more than 50% of the probability of various types of false weld caused by, such as LED pin Weld, IC pin Weld, row pin mother mother Weld Wait. Improvements in these issues need to be strictly improved and enhanced quality inspections to solve. The factory vibration test is also a good test method.
8, heat dissipation design LED will work when the heat, the temperature is too high will affect the LED's decay speed and stability, so the PCB board's heat dissipation design, the cabinet's ventilation and heat dissipation design will affect the performance of the LED.
LED daily maintenance method assembling
With the LED-backlit liquid crystal display fully spread in the market, many consumers often overlook the daily maintenance and maintenance of the LED-backlit LCD display, so that long-term use not only affects the user's visual experience, but also greatly reduce the life of the display.
The increase in the use of LED liquid crystal displays, on the one hand, is due to the fact that major manufacturers have to reduce the amount of workmanship in order to control production costs, resulting in premature aging of a few parts of some products; The reason is due to the user's improper use habits. The case of the latter is more common, and most users simply do not know how to properly use and maintain the LED liquid crystal display. Below, we will provide a brief introduction for everyone on the application and maintenance of LED-backlit LCDs.
Broken screen problem
To avoid problems that may be encountered, we can choose passive protection and active protection. Passive protection means that users in public places such as Internet cafes and dormitory rooms can choose to buy monitors with tempered glass, which can make your display “invulnerable. Water and fire will not invade, but it will have an impact on the color of the display, and there will be a phenomenon of reflection; and active protection is to be careful in normal use, try to keep the items that may cause harm to the screen away from the screen, and clean the screen Wipe as gently as possible to minimize the possibility of injury.
Maintain the humidity of the environment
All users who have damaged their keyboards by spilling drinks on the keyboard know this common sense. Do not allow anything with moisture properties to enter your LED display. Fog was found. Wipe it gently with a soft cloth before turning the power on. If moisture has entered the interior of the monitor, the monitor must be placed in a warm and dry place in order to allow the moisture and organics to evaporate. Applying power to a liquid crystal display that contains humidity can cause corrosion of the liquid crystal electrode and cause permanent damage.
Routine maintenance
The liquid crystal display has the closest relationship with our users. It is also very necessary to do a good job in cleaning and sanitation. In fact, the LCD monitor is also very easy to show dirty, white appearance is really good-looking, but do not pay attention to maintenance, it will soon turn yellowish; piano paint is indeed very performance, but a week down, the shell is certainly full of Handprint; Even ordinary black matte material, for some time, the screen is definitely a piece of dust. Many users know that they need to clean the LED display regularly, but do you know how to properly clean the LCD?
We must first consider purchasing a cleaner kit with better quality. The cost of the cleaning solution generally includes electrolyte, high-purity distilled water, antistatic fluid, etc. It can effectively clean the screen of dust, fingerprints and other imprints. We can buy some Well-known brand products. And a good cleaning cloth is also very particular about the use of ultra-fine fibers as the raw material of the product, the general high-end glasses sent glasses cloth can also be used to do cleaning cloth.
Some netizens think that clear water can also, but will not damage the LCD screen. However, the cleaning effect of clean water is relatively poor, and the cleaned dust will be attached again. Of course, if you want to save money, you can use clean water and it will be better than those cleaner fluids of unknown origin. At the same time, it is important to note that you must not spray water on the screen. Instead, spray a small amount of cleaning liquid on the cleaning cloth and gently wipe it in the same direction. Before cleaning, you need to put the power cord. Pull it out.
For most LED-backlit displays, the most vulnerable place is the screen. Generally, the screen hardness is below 3H (the hardness of the pencil core). When you use it normally, you don't pay attention to it is easily mistakenly injured by other devices, and once the screen is affected Loss means that this LED display is basically scrapped.
From display technology, LCD is a display screen composed of liquid crystal, and LED is a display screen composed of light-emitting diodes. Each pixel unit in the LED digital display is a light emitting diode. If it is a single color, it is generally a red light emitting diode. Here's a look at the eight LED warranty technology and daily maintenance methods.