Analysis of the application and development history of LED light source

As the name suggests, LED light source is the light-emitting part of LED products. LED light source is also called LED lamp bead, also known as LED. LED has entered mass production and used for more than 10 years. LED light source is generally divided into: plug-in lamp bead, patch lamp bead, large Power lamp beads and later COB light sources, today we look at the history of the development of LED light sources for these large light sources.

Plug-in LED lamp beads

Plug-in lamp bead is one of the earliest types of LED lamp bead application. The general working current is about 20 mA. The cheap price is undoubtedly the biggest advantage of the plug-in lamp bead, but the brightness of the plug-in lamp bead is relatively low. Plug-in lamp beads generally include: straw hat lamp beads, piranha lamp beads, straw hat lamp beads are generally widely used in early rise: lighting, display and various indicators can be seen in it, currently used in various indicators or More; piranhas are used most in LED modules. Because the straw hat lamp and the piranha lamp bead have low brightness and single color light have been gradually eliminated, the lamp beads and straw-shaped lamp beads have become the advantage in lighting and display.

SMD LED lamp beads

SMD beads are also an early LED light source. SMD beads are generally classified according to package size: 3528 lamp beads, 5050 lamp beads, 2835 lamp beads, 5630 lamp beads, etc. The general working current is tens of milliamps. There are dozens of types of SMD lamp bead package types. The main advantages of SMD type lamp beads are that the package type is suitable for various application environments. Compared with the plug-in lamp beads introduced above, the SMD lamp beads have high brightness and low cost; Useful in high power environments requires multiple distributions and poor stability. Patch-type lamp beads are used in a wide range of applications, including LED lighting, LED displays , LED backlights, and various indicators. The earliest patch beads were 3528, 5050, 3020, etc. The brightness of this series of lamp beads was relatively low due to limitations in technology and technology, so they later derived 2835, 5730, 3030 instead of them. Some columns replace their products, the latter has the advantages of high brightness, low light decay, etc. Due to the wide variety of patch lamp bead package types, the future development will be high lumens and small size development.

High power LED light source

High-power LED light sources generally have integrated package types ranging from 1W, 3w, 5w to several hundred w. Of course, the greater the power, the larger the power, the larger the volume, the larger the required heat dissipation area, and the larger the light color. The power LED light source is mostly monochromatic, and the full-color high-power LED light source is rare. The working current of the high-power LED light source is generally in the range of several tens of milliamperes to several hundred milliamperes. The advantage of the high-power LED light source is that the brightness is high, and the disadvantage is that the light color is single. Large heat generation requires a large area of heat dissipation. High-power LED light sources are generally used in LED lighting, from low-power lighting to high-power lighting, especially in high-power, high-brightness lighting environments. The high-power LED light source needs to break through in the future to increase the color rendering index, multi-color and reduce the heat generation under the same brightness.

COB light source

Cob light source is a chip-on-board package. It is a new type of LED light source package this year. Its advantages are low cost, high color rendering index lamps can be made through secondary light distribution, and the disadvantages are that it is used in the packaging process. The material has no cost advantage and its serial connection method has been fixed in the packaging process. In the factory application, it is not necessary to have a single high-power LED to be freely matched with the power size and color. COB light source applications in LED lighting, such as COB downlights, COB ceiling lights, etc., have a price advantage over products made from a single high-power LED. The COB light source still has light decay and poor reliability in production. Shortcomings such as short lifespan are difficult problems to be solved in the future.