From 1960 first commercial LED has gone through since its inception 40 years of history. But at the beginning is only for the use of LED watches, calculators, home and office equipment for the light it; With the rapid development of LED industry, chip technology and packaging technology have matured so that LED luminous light efficiency greatly improved, photoelectric performance is also relatively stable, while the cost of product development and manufacturing costs also declined substantially, so that in many areas of social and economic widely used,
Including: road traffic lights, backlit display, auto lights, full color displays.

Today LED white lighting is well on its way forward, because countries in the world to catch up with the implementation of low-carbon energy, environmental protection and swept the globe. These applications are the LED emitting angle requirements are relatively strict, otherwise it will affect the practical effect.

LED light-emitting angle is defined
Also known as power LED light-emitting angle perspective we usually use half power angle that is 50% of the luminous intensity angle. Of course, it was also a 60%, 80% or 90% of the angle, which depending on the application surface.



Application of different types of angles
Small angle of 10 degrees, the general said more used small-angle LED illumination angle is smaller and relatively remote areas, such as: railway level crossing on the lights.




Large Angle
30 degrees, the general said, wide-angle LED illuminated surface is larger and more used in relatively remote areas and perspectives, such as: traffic signal lights. General angle of 30 degrees, and require the light irradiation spot uniformity, consistency.




Oval wide angle
Generally speaking Oval Wide Angle LED illuminated surface is larger and more used in Comparative Perspective remote places, such as: indoor and outdoor display. In addition to displaying outside also stressed R, G, B light mixing effect, making the display image more vivid.



Factors affecting LED angle
1.LED package exterior shape
2 bowl cup bracket structure
3 chip and the structure itself
4 packages of glue refractive index
5 Material quality and consistency
6. Packaging process (ie, emitting chip height position)

How to package a good perspective must first have a good design A.LED mold grain roundness better consistency;
B. bracket bowl cup size and smoothness is better;
C. Selected good chip;
D. Select the appropriate refractive index of the glue; E. emitting chip must be placed in the position of the focal point of the lens colloid.