LED optical and electrical properties.P6.67 oudtoor LED display

　　COB full color has good color consistency, large viewing angle, uniform light spot, high brightness, and good color mixing effect. These are the characteristics and advantages that SMD full color and dot matrix full color cannot surpass.

　　With a wide viewing angle and high brightness, COB adopts heat sink technology to ensure that LED has an industry-leading heat flux maintenance rate (95%). The following is a comparison image of the appearance and angle light shape between dispensing and SMD

　　COB Full Color Appearance SMD Full Color Appearance

　　COB has better visual consistency. From the appearance alone, it can be seen that there are hundreds of light emitting points on the adhesive board that are all on the same PCB board, that is, on the same horizontal plane. Therefore, the light emitting points are all on the same reference point, resulting in a more uniform light spot. However, SMDs are attached to the PCB board one by one, and there will definitely be high and low spots, resulting in uneven light spots, which results in a visual effect worse than that of COB packaging.

　　COB has better light quality. As can be seen from the following figure:

　　The traditional packaging form of SMD in the figure on the right is to mount multiple discrete devices onto a PCB board, forming an LED application. This method has problems with spot lighting, glare, and ghosting, as clearly shown in the figure; And COB is an integrated packaging, a surface light source, which not only has the advantage of a large viewing angle, but also reduces the loss of light refraction.

　　COB has a larger perspective. From the light chart below, it can be seen that the viewing angle of the OLEDA COB is much larger than that of the SMD full color. The SMD full color viewing angle is about 110 degrees. However, the COB full color viewing angle can reach 140-170 degrees without weakening the brightness, and the vertical angle also has a wide viewing angle of 140-170 degrees. These characteristics are particularly advantageous in some application scenarios. The following is a comparison of the two optical graphs:

　　COB angle light chart SMD angle light chart

　　From the actual luminous effect diagram, it can be seen as follows:

　　Glue dispensing luminous effect diagram SMD luminous effect diagram

　　From the above comparison, it can be seen that the visual effect of COB full color is superior to that of SMD full color, both in terms of perspective size and luminous effect.

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