The LED bracket is the substrate of the LED lamp bead before the package, which functions to protect the solid crystal bonding wire and the silicone molding, and turns on the circuit and affects the optical and electrical characteristics. The performance of the structure of the bracket directly affects the performance of the LED lamp bead. At present, many lamp beads are dead. After the microscope observation, the chip in the lamp bead does not appear abnormal, but the alloy wire connecting the chip is separated from the metal substrate to cause an open circuit. As shown in Figure 1.
Figure 1: The alloy wire connecting the chip is separated from the metal substrate to cause an open circuit.
At the same time, it was found that the lamp beads causing this phenomenon were directly or indirectly exposed to the air, and there was moisture in the air. It can be inferred that the anti-moisture structure of the LED bracket is not well made, causing moisture to penetrate into the lamp bead, thereby causing the encapsulant to be easily detached from the metal substrate in the environment where the LED lamp bead is long-term lit, so that the unplugging is welded. An alloy wire on a metal substrate to form a circuit break.
With the increasing demand for LEDs in the global light source market, the use of LED lamp beads is becoming wider and wider, and users are increasingly demanding the performance of LED lamp beads. If the moisture-proof structure of the LED holder is not well designed, it is inevitable to limit the use conditions, use areas, fields of use, and the like of the LED lamp bead. As an LED designer and manufacturer, there must be a breakthrough in the moisture-proof structure of the LED bracket.
First, the basic knowledge of liquid flow
The nature of the flowing liquid is between the gas and the liquid. On the one hand, it is like a solid, has a certain volume, is not easy to compress; on the other hand, it is like a gas, has no certain shape, and has fluidity. The flowing liquid is affected by inertia force, viscous force, etc., and the pressure in any direction in the interior is not equal.
The flowing liquid will be subjected to the resistance along the path and the local resistance along the way. The mechanical energy loss caused by the resistance along the path is called the loss along the path. The energy loss that overcomes the local resistance is called the local loss. The energy loss of all flowing liquids is equal to the sum of the losses along the sections and the local losses.
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