With the mobile phone flash, large and medium-sized (NB, LCD-TV, etc.) display light source modules, as well as the application of special lighting systems gradually increased. In the end, it will be extended to the equipment used in general lighting systems, and the high-power (HighPower) LED market using white LED technology will gradually emerge. In terms of technology, the biggest challenge at present is to enhance and maintain brightness. If the heat dissipation capability is further enhanced, the market has great potential for development.

The key to the technology is the choice of eutectic materials and the control of the welding temperature. A new generation of InGaN high-brightness LEDs, such as eutectic soldering, can use pure tin (Sn) or gold-tin (Au-Sn) alloy as the contact surface coating on the bottom of the die, and the die can be soldered to a substrate plated with gold or silver. on. When the substrate is heated to a suitable eutectic temperature (Figure 5), the gold or silver element penetrates into the gold-tin alloy layer, the composition of the alloy layer changes to improve the melting point, and the eutectic layer is cured and the LED light-emitting diode is fastened by welding. On heat sinks or substrates. The eutectic temperature depends on the heat resistance of the die, the substrate and the device material, and the temperature requirement for the subsequent SMT reflow process. When considering the eutectic bonding table, in addition to the high position accuracy, another important condition is the flexible and stable temperature control. The addition of nitrogen or mixed gas devices helps to protect against oxidation in the eutectic process. Of course, like silver paste solid crystal, to achieve high-precision solid crystal, depends on the rigorous mechanical design and high-precision motor movement, in order to make the welding head movement and welding control just right, but also without damage to high productivity and high yield The request.

Many people have encountered. Some of them were discovered at the time of production inspection and some were discovered when used by customers. Leakage occurs at different times. Some of them were tested after the LED package was completed. Some appeared after the warehouse was stored for a period of time, some appeared after a period of aging, some appeared after the customer was soldered, and some appeared after the customer used it for some time.

If you want to distinguish between the quality of the LED lamp beads and lamp beads quality parameters. The quality of the led lamp beads is related to packaging technology, gold wire, glue, split light technology, baking technology, as well as the quality of chip raw materials, which will affect the quality of led lamp beads. To find good quality, I suggest that you find some brands of companies, such as expansion, Tongjia, Corey, Osram, etc., in the led lamp beads do this one has a lot of advantages. Specific information you can search on the Internet.

First, the current use of straw hat LED lamp beads; Second, the brightness test and product instructions; Third, anti-static precautions; Fourth, welding conditions; Fifth, due to design needs to bend or cut the foot when the pin forming method; Straw hat LED lamp beads installation method; Seven, straw hat LED lamp beads work and storage temperature

LED lamp bead light is the key to product quality and reliability. How to reduce and eliminate dead lights and improve product quality and reliability is a key issue for packaging and application companies. The following are some of the reasons for the analysis of dead lights. 1. Electrostatic damage to the LED chip; 2. Analysis of the cause of the dead light phenomenon caused by the open connection of the LED lamp bead; 3. How Shenzhen Shenzhen Development teaches you to identify dead-lamp dead lights

Because led bulb energy-saving low-carbon environmental protection, no flash, no radiation, high brightness, low heat, etc., gradually began to replace the fluorescent lamps on the market. Although the led lights have so many advantages, there are still a series of problems if they are not handled properly. For example, the lamp is not lit, the dead lamp is on, the lamp beads flash when it is dark, and the lamp beads leak.

Led lamp beads prices vary, such as 0603 SMD led lamp beads and some sell 12/1K, and some sold 80/1K, led lamp beads material, chips, different workmanship affect the price of led lights lamp beads

LED light-emitting diode how to distinguish the positive and negative? During the application of LED light-emitting diodes, it is often encountered how to identify the positive and negative electrodes of the light-emitting diodes. Lights do not light on the positive and negative, positive and negative welding reversed, the light is not bright

On the LED light-emitting diodes, the network has a very many, very professional introduction, such as Baidu Encyclopedia LED light-emitting diodes, very professional and detailed. Here is not to mention the introduction of the professional, here to give you a more general introduction, so that people without basic knowledge can understand, understand LED light-emitting diodes.

LED lamp beads of the model and specifications of small knowledge, as the LED lamp beads industry people should not be familiar, but it must also have a certain understanding of the LED lamp beads.

LED lamp beads too many models, there are straight and patch type, as well as high-power LED lamp beads, LED lamp beads current from tens of milliamps to a few have, the voltage is more consistent, most of them are Three o'clock. According to the LED package is divided into line LED, SMD LED; according to the power is divided into large, medium and low power.
High-power white LED (such as CREE's XML-T6) has reached a single power of 10W, voltage 3.3v current 3A, low power red LED (such as the common 5MM inline) voltage 2v, current 15 mA.

LED is called semiconductor light-emitting diode. It is a light-emitting device made of semi-conductor material that directly converts electric energy into light energy and converts electric number into light signal. Its object is low power consumption, high brightness, colorful, anti-vibration, Long life (8-10 million hours of normal light), cold light source and other advantages, is the real "green lighting." The lighting products with LED as a new light source will certainly replace the white knit lamp in the 21st century to become another revolution in human lighting. LED lamp beads use low-voltage power supply, the supply voltage is between 2-4V, varies according to the product, so it is a ratio of the use of high-voltage power supply; safer power supply, especially suitable for public places.