What is the difference between small-pitch LED gold wire package and alloy wire, copper wire and copper bracket?
The price of small spacing LED display screen has great difference in the market, among which led chip plays an important role. In LED packaging, copper wire technology is favored by LED lamp manufacturers because of its reduced manufacturing cost, so it is researched and developed and put into use, and has been recognized and used by many LED display panel manufacturers. However, in practical application, compared with gold wire welding, there are a series of problems in copper wire technology. The detailed differences between LED gold wire package and alloy wire, copper wire and copper bracket are listed in detail below.
From the picture, we can clearly see the difference between LED gold wire, alloy wire and copper wire. Among them, the packaging materials of pure gold wire have obvious advantages in oxidation resistance, back pressure resistance, conductivity, technical maturity and price. Of course, the price advantage refers to the increase of cost, while the led alloy wire and copper wire have different deficiencies!
At present, the iron bracket products have been eliminated in the Winbond Optoelectronics production line, but there are still very few companies in the market that will use them in order to reduce costs! It can be seen that LED display screens often have to deal with large temperature differences during normal use. The bracket material will expand and contract with heat. The product life of the copper bracket can reach 5 years or more. The specific of the iron bracket The service life is only 1-3 years. During the use of LED display screens, they often face harsh environments such as rainy and damp, sunny days, etc. This requires that the device must have good performance in order to withstand external losses. Strong corrosion resistance, good electrical and thermal conductivity can make the device have the advantages of longer life, better heat dissipation, and less light attenuation. Through comparative tests, we can conclude that the performance of the copper bracket is far superior to that of the iron bracket.
However, the price of copper brackets is 10 times or more than iron brackets. For this reason, many manufacturers disregard the quality of the devices, only pursue low cost and high return, and choose iron stents as raw materials. Therefore, so many "low-cost devices" appear on the market.
The difference between copper bracket and iron bracket is as follows:
The copper bracket has better corrosion resistance and longer service life
The copper bracket will not produce cracks when bending, the process is easy to control, and the scalability is excellent
The copper bracket has higher thermal conductivity, stronger thermal conductivity and faster heat dissipation. The thermal conductivity property value of the copper bracket: 401W/mk, and the copper thermal conductivity property value of the iron bracket: 80W/mk
The resistivity of the copper bracket is smaller and the conductivity is better! Copper bracket value: 1.75x10-8; iron bracket value: 9.78x10-8
In the LED gold wire, alloy wire, copper wire detailed difference
Gold thread: LED gold thread deserves to be noble and noble, international standard, reliable, stable and guaranteed! It is made of pure gold with an Au purity of 99.99% or more, with stable and reliable performance.
Alloy wire: alloy wire is also called silver alloy wire. On the basis of gold wire, it is mixed with a large amount of silver, palladium which keeps IMC stable, and a small amount of trace elements. Need to install nitrogen protection before use.
Copper wire: Copper wire includes single crystal copper wire and palladium-plated copper wire. High rigidity makes it more suitable for small wire bonding, but copper wire is more susceptible to oxidation and the process is unstable.
Performance test of led gold wire, alloy wire and copper wire
Back-pressure resistance test: Under the back-pressure resistance test, the LED gold wire packaged chip did not fail, and the test effect was high-quality and obvious.
Anti-oxidation test: oxidation effect of led gold wire ＞ Alloy wire ＞ Copper wire
Production process: The gold wire has stable properties, is not easy to oxidize, and is easy to handle; the alloy wire needs to be added with protective gas during the process, and the technical requirements are high; the copper wire has high hardness and is difficult to bond.
The overall quality of the led display is inseparable from the core materials. Quality is the core foundation for the long-term healthy development of the company. While ensuring the quality, the cost of using the LED gold wire packaging is inescapable. Both companies and customers need a true understanding!
To cite a real case: a large number of dead lights occurred in the lamp beads shipped by a packaging factory, and analyze the reasons for the failure. Jian found that the diameter of the gold wire of the dead lamp lamp bead was 27.0±1.0μm, which was inconsistent with the 30μm specification of the gold wire reported by the customer. At the same time, the gold wire was scratched and the gold wire was fused with high current. The unqualified gold wire was the main cause of the accident. The bonding wire is a gold wire with a diameter of about 27.0±1.0μm, which is inconsistent with the gold wire specification 30μm reported by customers. If the diameter of the gold wire is too small, the resistance of the gold wire will increase and the fusing current will decrease, which will greatly reduce the life of the LED light source.