At present, the LED technology is becoming more and more mature, and the advantages of its long life has been the focus of public attention. But in recent years, in the production and application of LED, we still encounter a lot of dead light phenomenon. The so-called Dead lights, also known as light, LED light source is not bright. Whether it is the production or application of the resulting dead lights, manufacturers are very headache problem, both to face the loss of bad products, but also affect the consumer confidence in LED products.
1, Deformation caused by dead lights:
Due to the existence of the lamp plate deformation, the operator will go to surgery, because the board deformed above beads also with tensile deformation, gold, caused by light is not bright, that this type of board is best in front of the production of plastic processing. Longer in the production and assembly and moving over and may also cause the deformation of gold wire phenomenon. There is a pile caused by the production process, in order to facilitate smoothly, will light board randomly stacked, due to gravity, the lower beads will force deformation, damage of gold.
2, Improper storage caused by dead lights:
This is the most common, do not pay attention to the problem of moisture after the bag is opened, the lamp sealing glue more silica gel material, which has certain characteristics of water absorption, moisture beads affixed to the plate after the welding process after high temperature silicone will Rezhanglengsu, gold, chip, support deformation in gold displaced fracture, lamp not lit phenomenon is produced, therefore recommend: LED should be stored in dry and ventilated environment, storage temperature of -40 – +100 DEG C, relative humidity below 85%; LED in the original packaging conditions under 3 months to use better, in order to avoid the bracket rust; when the packaging bag is LED after opening, to be used as soon as possible, the storage temperature of 5 DEG -30 DEG C, relative humidity below 60%.
3, Chemical cleaning:
Do not use chemical cleaning liquid LED is unknown, because it may damage the LED colloid surface, and even cause the colloid cracks, if necessary, please sign for cleaning with alcohol cotton at room temperature in a well ventilated environment, the best time to finish in a minute wind control.
4, Welding process problems:
A, electric soldering iron is the most common, such as sample preparation, maintenance, because most of the existing manufacturers in order to save costs, the electric iron for more quality products to repurchase slightly substandard, mostly bad ground, existing leakage, welding process of welding LED– body, which is equal to the earth to form a loop in the iron the tip, the leakage is equal to that of dozens of times, hundreds of times – exerted on the lamp voltage in the LED lamp above the burning moment.
Note: the static with the situation will be more serious, because when the body is connected with a smaller resistance on the formation of the electrostatic loop, through the body to the lamp current will be larger, this is also a lot of people say there is still the electrostatic with so much damage to the lamp.
B, the heating platform caused by welding dead lights, lamps as sample single, most enterprises in order to meet the needs of small batch and single sample, because the equipment cost is low, the advantages of simple structure and operation, the heating platform became the best means of production, but due to the use of the environment (for example: there is a fan of the local temperature not a constant problem) and the welding operator operating proficiency and the control of welding speed becomes a problem caused by a large dead lights, in addition there is a heating platform equipment grounding.
C, reflow, general this welding method is the most reliable way of production, suitable for mass production and processing, if improper operation, will cause more serious consequences such as death light, temperature is not reasonable, the machine bad grounding etc..
5, The heat dissipation structure, power supply and the lamp plate does not match:
The design of power supply or unreasonable power supply exceeds the maximum limit of LED can withstand (current, instantaneous impact); the lamp radiating structure is not reasonable, can cause premature decay and death light.
Static electricity can cause LED function failure, it is recommended to prevent ESD damage LED.
A, LED testing and assembly personnel must wear anti-static bracelet and anti-static gloves.
B, welding equipment and test equipment, working table, storage rack, etc. must be grounded.
C, use ion fan to eliminate the static electricity generated by LED during storage and assembly.
D, LED box with anti-static material box, packaging bag using electrostatic bag.
E, do not have luck, touch LED.
ESD damage by LED will appear abnormal phenomenon:
A, reverse leakage, light will cause a decrease in brightness, serious lights do not light.
B, the forward voltage value becomes small. LED can not emit light when low current drive.
C, the welding is not good.
There are many factors leading to the LED display dead light, can be summed up as a result of the production process and the use of improper storage.
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