In the production and application of LED lamp beads, we still encounter a lot of "deadlights" phenomenon. The so-called dead light, also known as the light off, is that the LED light source is not bright. Whether it is the dead light generated in production or application, it is a headache for manufacturers. It must face the loss caused by product defects and affect consumers' confidence in LED products.
Therefore, researching and summarizing the causes of some common LED dead lights helps us to reduce and prevent the recurrence of LED product failures, ensure product quality and improve product competitiveness, and also provide the reference for enterprise technology improvement and improvement. Thereby creating greater economic benefits for the enterprise.
The reason for lamp necrosis is introduced and the analysis of the quality and price of led lamp beads
Causes of lamp necrosis
First, improper use of welding methods
Common welding methods can be divided into electric soldering iron welding, heating platform welding, and reflow soldering, etc.:
1. Soldering iron welding is the most common, such as sample preparation and maintenance. Due to the cost savings of most existing manufacturers, most of the soldering irons purchased are unqualified products, most of which are poorly grounded, there is leakage, and the welding process This is equivalent to the tip of the electric iron in the leakage - the LED is welded - the human body - the earth forms a loop, that is to say, tens of times - hundreds of times the voltage of the lamp bead is applied to the LED lamp bead, instantaneously Burn it out. Note: The situation of connecting the static electricity belt will be more serious, because when the human body is connected to the static electricity belt, the resistance to the ground forming circuit is smaller, and the current through the human body to the lamp bead will be larger, which is also said to be electrostatically charged by many people. There are still so many problems with lamp bead damage.
2. The dead light caused by the heating platform welding, due to the continuous sample of the lamps, most enterprises have become the best production tools in order to meet the needs of small batches and sample sheets. Due to the low cost of equipment, simple structure, and operation, etc. However, due to the use environment (for example, the temperature of the fan cannot be constant) and the control of the welding operator's proficiency and welding speed has become a major problem causing the dead light, in addition to heating Grounding of equipment on the platform.
3, reflow soldering, generally this welding method is the most reliable production method, suitable for mass production and processing, if the improper operation, it will cause more serious dead light consequences, such as unreasonable temperature adjustment, poor machine grounding.
Second, improper storage caused by dead lights
This kind of problem is the most common. Because it does not pay attention to the moisture-proof problem after opening the package, because the sealing material of the lamp bead is mostly made of silica gel material, it has certain water absorption characteristics. After the damp after the lamp bead is attached, the high-temperature welding process The silica gel will expand and contract, and the deformation of the gold wire, chip and bracket will cause the gold wire to shift and break, and the light spot will not be bright. Therefore, it is recommended that the LED is stored in a dry and ventilated environment with a storage temperature of -40. °C- +100 °C, relative humidity is below 85%; LED is used within 3 months under its original packaging condition to avoid rusting of the bracket; when the LED packaging bag is opened, it should be used as soon as possible. The storage temperature is 5 ° C - 30 ° C, and the relative humidity is below 60%.
Third, chemical cleaning
Do not use unknown chemical liquids to clean the LEDs, as this may damage the surface of the LED colloids and even cause colloidal cracks. If necessary, clean them with an alcohol swab in a normal temperature and ventilated environment. The time is best controlled in one minute.
Fourth, the deformation caused the dead light
Due to the deformation of some of the light panels, the operator will go to the plastic shape. Because the board is deformed, the upper light beads are also deformed together at the same time. The gold wire is broken and the light is not bright. It is recommended that this type of board is the most It is good to carry out shaping treatment before production. Longer production and assembly and moving may also cause deformation to break the gold wire. There is also the stacking, the production process for the convenience of the hand, the light board is randomly stacked, due to gravity, the lower layer of the lamp bead will be deformed by force, damage the gold wire.
5. The heat dissipation structure, power supply, and lamp board do not match.
Due to unreasonable power supply design or selection, the power supply exceeds the maximum limit that the LED can withstand (super current, instantaneous impact); the heat dissipation structure of the lamp is unreasonable, which will cause dead lights and premature light decay.
Sixth, factory grounding
The factory's total ground wire must be checked for goodness.
Seven, static electricity
Static electricity can cause LED function failure. It is recommended to prevent ESD from damaging the LED.
1. The operator must bring an anti-static wrist strap and anti-static gloves when testing and assembling LEDs.
2. Welding equipment and test equipment, work tables, storage racks, etc. must be well grounded.
3. Use an ion fan to eliminate static electricity generated by the LED during storage and assembly due to friction.
4. The box containing LED is made of the anti-static material box, and the packaging bag is made of the electrostatic bag.
5, do not have the luck, touch the LED.
The anomalies that can be caused by ESD-damaged LEDs are:
1. Reverse leakage, the light will cause the brightness to decrease, and the light will not light.
2. The forward voltage value becomes smaller. The LED does not emit light when driven at low current.
Eight, poor welding caused the light points are not bright
The pros and cons between LED lamp beads price and quality
LED lamp bead is the light source that LED products to need to illuminate, and the lighting time is relatively long. If the quality is not enough, it will not meet the needs of residents. The post-management maintenance of LED lamp bead is not a small task. If the price is too expensive, the budget is not enough, no profit can be earned, I believe that the engineering company is not willing to pick up, but it is too cheap, and is afraid that the quality is not reliable, how to recover the amount of engineering in the later period? The most important thing is that it will affect reputation. What should I do?
Therefore, the LED lamp bead requires its lighting rate to be one of the key indicators. Then, when the LED lamp bead is purchased at the beginning, you should grasp the following key links. Here to analyze the characteristics of the expansion of LED lamp beads, more effective to help everyone's purchase.
LED lamp bead purchase attention points
1. Pay attention to the service life of LED lamp beads. long life. The temperature of the light source base does not exceed 60 degrees Celsius.
2. Pay attention to the LED chip used in the LED lamp bead. The expansion of optoelectronic LEDs uses wafer chips and uses a unique packaged light source design.
3. Pay attention to the brightness of the LED lamp bead. The imported high-brightness semiconductor wafer has the characteristics of high thermal conductivity, small light decay, pure light color, and no ghosting; the overall illumination and uniform brightness.
4. Pay attention to the warranty time of LED lamp beads.
5. Pay attention to the light color of the LED lamp beads. The color rendering is good, and the color of the real object is more realistic. It can meet the needs of different environments and eliminates the depressed emotion caused by the high or low color temperature of the traditional lamps, which makes the visual comfort.
6. Start with constant current, fast response, no need for preheating, and quick start.
The above are the various reasons for lamp necrosis. Is there a new understanding of the lamp bead? Do you know more about the trade-off between the price and quality of the LED lamp bead? If you are in front of you, what will happen to you?
Please Follow/Contact us for more information!
Therefore, researching and summarizing the causes of some common LED dead lights helps us to reduce and prevent the recurrence of LED product failures, ensure product quality and improve product competitiveness, and also provide the reference for enterprise technology improvement and improvement. Thereby creating greater economic benefits for the enterprise.
The reason for lamp necrosis is introduced and the analysis of the quality and price of led lamp beads
Causes of lamp necrosis
First, improper use of welding methods
Common welding methods can be divided into electric soldering iron welding, heating platform welding, and reflow soldering, etc.:
1. Soldering iron welding is the most common, such as sample preparation and maintenance. Due to the cost savings of most existing manufacturers, most of the soldering irons purchased are unqualified products, most of which are poorly grounded, there is leakage, and the welding process This is equivalent to the tip of the electric iron in the leakage - the LED is welded - the human body - the earth forms a loop, that is to say, tens of times - hundreds of times the voltage of the lamp bead is applied to the LED lamp bead, instantaneously Burn it out. Note: The situation of connecting the static electricity belt will be more serious, because when the human body is connected to the static electricity belt, the resistance to the ground forming circuit is smaller, and the current through the human body to the lamp bead will be larger, which is also said to be electrostatically charged by many people. There are still so many problems with lamp bead damage.
2. The dead light caused by the heating platform welding, due to the continuous sample of the lamps, most enterprises have become the best production tools in order to meet the needs of small batches and sample sheets. Due to the low cost of equipment, simple structure, and operation, etc. However, due to the use environment (for example, the temperature of the fan cannot be constant) and the control of the welding operator's proficiency and welding speed has become a major problem causing the dead light, in addition to heating Grounding of equipment on the platform.
3, reflow soldering, generally this welding method is the most reliable production method, suitable for mass production and processing, if the improper operation, it will cause more serious dead light consequences, such as unreasonable temperature adjustment, poor machine grounding.
Second, improper storage caused by dead lights
This kind of problem is the most common. Because it does not pay attention to the moisture-proof problem after opening the package, because the sealing material of the lamp bead is mostly made of silica gel material, it has certain water absorption characteristics. After the damp after the lamp bead is attached, the high-temperature welding process The silica gel will expand and contract, and the deformation of the gold wire, chip and bracket will cause the gold wire to shift and break, and the light spot will not be bright. Therefore, it is recommended that the LED is stored in a dry and ventilated environment with a storage temperature of -40. °C- +100 °C, relative humidity is below 85%; LED is used within 3 months under its original packaging condition to avoid rusting of the bracket; when the LED packaging bag is opened, it should be used as soon as possible. The storage temperature is 5 ° C - 30 ° C, and the relative humidity is below 60%.
Third, chemical cleaning
Do not use unknown chemical liquids to clean the LEDs, as this may damage the surface of the LED colloids and even cause colloidal cracks. If necessary, clean them with an alcohol swab in a normal temperature and ventilated environment. The time is best controlled in one minute.
Fourth, the deformation caused the dead light
Due to the deformation of some of the light panels, the operator will go to the plastic shape. Because the board is deformed, the upper light beads are also deformed together at the same time. The gold wire is broken and the light is not bright. It is recommended that this type of board is the most It is good to carry out shaping treatment before production. Longer production and assembly and moving may also cause deformation to break the gold wire. There is also the stacking, the production process for the convenience of the hand, the light board is randomly stacked, due to gravity, the lower layer of the lamp bead will be deformed by force, damage the gold wire.
5. The heat dissipation structure, power supply, and lamp board do not match.
Due to unreasonable power supply design or selection, the power supply exceeds the maximum limit that the LED can withstand (super current, instantaneous impact); the heat dissipation structure of the lamp is unreasonable, which will cause dead lights and premature light decay.
Sixth, factory grounding
The factory's total ground wire must be checked for goodness.
Seven, static electricity
Static electricity can cause LED function failure. It is recommended to prevent ESD from damaging the LED.
1. The operator must bring an anti-static wrist strap and anti-static gloves when testing and assembling LEDs.
2. Welding equipment and test equipment, work tables, storage racks, etc. must be well grounded.
3. Use an ion fan to eliminate static electricity generated by the LED during storage and assembly due to friction.
4. The box containing LED is made of the anti-static material box, and the packaging bag is made of the electrostatic bag.
5, do not have the luck, touch the LED.
The anomalies that can be caused by ESD-damaged LEDs are:
1. Reverse leakage, the light will cause the brightness to decrease, and the light will not light.
2. The forward voltage value becomes smaller. The LED does not emit light when driven at low current.
Eight, poor welding caused the light points are not bright
The pros and cons between LED lamp beads price and quality
LED lamp bead is the light source that LED products to need to illuminate, and the lighting time is relatively long. If the quality is not enough, it will not meet the needs of residents. The post-management maintenance of LED lamp bead is not a small task. If the price is too expensive, the budget is not enough, no profit can be earned, I believe that the engineering company is not willing to pick up, but it is too cheap, and is afraid that the quality is not reliable, how to recover the amount of engineering in the later period? The most important thing is that it will affect reputation. What should I do?
Therefore, the LED lamp bead requires its lighting rate to be one of the key indicators. Then, when the LED lamp bead is purchased at the beginning, you should grasp the following key links. Here to analyze the characteristics of the expansion of LED lamp beads, more effective to help everyone's purchase.
LED lamp bead purchase attention points
1. Pay attention to the service life of LED lamp beads. long life. The temperature of the light source base does not exceed 60 degrees Celsius.
2. Pay attention to the LED chip used in the LED lamp bead. The expansion of optoelectronic LEDs uses wafer chips and uses a unique packaged light source design.
3. Pay attention to the brightness of the LED lamp bead. The imported high-brightness semiconductor wafer has the characteristics of high thermal conductivity, small light decay, pure light color, and no ghosting; the overall illumination and uniform brightness.
4. Pay attention to the warranty time of LED lamp beads.
5. Pay attention to the light color of the LED lamp beads. The color rendering is good, and the color of the real object is more realistic. It can meet the needs of different environments and eliminates the depressed emotion caused by the high or low color temperature of the traditional lamps, which makes the visual comfort.
6. Start with constant current, fast response, no need for preheating, and quick start.
The above are the various reasons for lamp necrosis. Is there a new understanding of the lamp bead? Do you know more about the trade-off between the price and quality of the LED lamp bead? If you are in front of you, what will happen to you?
Please Follow/Contact us for more information!
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