Skip to main content

How to Effectively Prevent the Aging of LED Products?

JRPanel has long launched a membrane switch with embedded LEDs. Although the LED power on the membrane switch is not large, how to effectively prevent its aging is also one of the issues that JRPanel continues to focus on.

 

Today, the engineers of JRPanel would like to share a few points with you on this problem.

 

LED Conventional Aging Test Comparison

 

Generally speaking, the luminosity of the LED will have a certain attenuation during the initial lighting stage. In order to provide stable luminous products to application manufacturers, or to obtain stable LED materials, LED packaging factories usually do some aging tests. Of course, there are many ways of LED aging test, such as conventional aging, overcurrent impact destructive test and so on.

 

LED manufacturers usually perform the following aging tests:

 

1. Multi-tube series aging test: constant voltage aging circuit and constant current aging circuit;

 

2. Multi-tube parallel aging test;

 

3. Multi-tube series and parallel aging test: series-parallel constant voltage aging and series-parallel constant current aging;

 

4. Single-tube constant current aging test.

 

In both Test 1 and 3, as long as one LED has a quality failure, such as short circuit or open circuit of the LED, it will affect the working current parameters of other LEDs. Test 2 is better than Test 1 and 3. Changes in the characteristics of any one LED will not affect the aging parameters of other LEDs. But in fact, the method of current limiting by resistance is unreliable. The resistance drift of the resistance itself and the change of the voltage characteristics of the LED itself will seriously affect the LED parameters. Obviously, Test 4 captures the LED current working characteristics and is the most scientific LED aging method.

 

Aging test is a very important process, but it is often overlooked in many enterprises. Correct and effective aging cannot be carried out, and the analysis of parameters such as brightness and wavelength of the LED itself will not be accurate.

 

Overcurrent impact aging test is also a test method often used by manufacturers. Usually, a constant current source with adjustable frequency, adjustable current and adjustable duty cycle is used for such aging, in order to judge the quality and life expectancy of the LED in a short time.

 

How to Effectively Prevent Product Aging?

 

When applying LEDs, we often encounter this kind of problem: LED products work normally when they are just powered on, but after lighting for a period of time, there will be brightness reduction, flickering, failure, intermittent lighting and other phenomena. This can cause serious damage to the product.

 

According to our experience and research, the reasons for this phenomenon are roughly as follows:

 

1. When applying LEDs to products, there are problems in the soldering process. For example, the soldering temperature is too high, the soldering time is too long, and the anti-static work is not done well;

 

2. Problems in the LED production process lead to poor quality.

 

In view of the above 2 possible problems, we propose the following preventive measures:

 

1. Ensure accurate operation during soldering process;

 

2. Carry out an aging test on the product.

 

Aging test is an important guarantee for the reliability of electronic products and the last essential step in production. LED aging test is a very important link in product quality control, but it is often overlooked in many cases. The LED aging test is a countermeasure taken according to the failure rate curve of the product, that is, the characteristics of the bathtub curve, so as to improve the reliability of the product. But this method is not necessary, after all, the aging test is at the expense of sacrificing the life of a single LED product.

 

In order to ensure the service life of the LED membrane switch, JRPanel's purchasing staff will select those LED products that have passed the proper aging test.

 

JRPanel aims to provide the highest quality products to everyone.

Comments

Post a Comment

Popular posts from this blog

Identify Different Types of Transformer Cores, Based on Materials

  Hi guys, this is JRPanel ! In previous  blog s, we have introduced several points about High Frequency Transformer, like  bobbins  and  Flat Spiral Coil . In this blog, JRPanel would like to introduce the commonly used magnetic cores in transformers ,  based on materials.   Generally speaking, the material of the core determines the environment in which the transformer is used. A transformer that uses a core of a different material will have its performance affected, may even be non-functional.   By material, magnetic cores are generally divided into the  several  categories . JRPanel will introduce them one by one to help you understand more fully.   1. Manganese Zinc Ferrite Core Mn-Zn core is a soft magnetic core with high initial permeability (2000~15000). The higher the initial permeability, the lower the surface resistance, so it is generally used in circuits below 1 MHz. Mn-Zn core has a high saturation flux density and causes lower losses, making it one of the most desirable
Post a Comment
Read more

The Relationship Between Plastic Nameplates and Membrane Switches

Before the 1970s, most nameplates   were made of metal materials. Today, plastic  nameplates   have been widely used in household appliances, instruments, meters, office equipment and other fields, and have become an indispensable part of electromechanical products. It not only plays the role of trademark identification, specification model, function indication, etc., but also becomes an element that reflects the appearance of the product.   With the continuous use of new materials and new processes, the surface of plastic  nameplates   is constantly improving, and it has become the crystallization of three major technologies: comprehensive surface treatment, processing and molding, and screen printing.   Plastic  nameplates   can be divided into 2 types according to their material processing methods and objects of use:   1. The injection-type plastic  nameplate   is made of ABS, PC and other engineering injection molding, and then undergoes secondary surface decoration processing such
Post a Comment
Read more

The Main Use and Classification Methods of Transformer Bobbins

  Hi guys, this blog is still about   high frequency transformers .   JRPanel   would like to introduce you the main use of transformer bobbins and how we classify them.   In the pictures are the transformer bobbins.        Following are the main uses of that JRPanel has summarized for you:   1. The bobbins provide space for winding copper wires in transformers.   2. Wire channel in the bobbins provides path for transformer winding.   3. The bobbins help to fix the core in the transformers.   4. The metal pins in the bobbins are connected to the  PCB  after soldering, which play an important role in conducting electricity when the transformer is working.   5. The baffle at the bottom of the bobbins isolates the core from the tin stack to avoid poor volta ge resistance.       From this it can be seen that the importance of bobbins in transformer is extraordinary.   After understanding the main uses of transformer bobbins,  JRPanel  is to introduce its common classification methods.   Fi
Post a Comment
Read more