When you place a conventional GOB product and a HOB product side by side, and scratch the surface with a screwdriver, you will see a clear difference. The GOB product is not scratch-resistant and will show scratches and cracks immediately, while the HOB product will remain intact. This is because the HOB product uses the COB process of high-temperature molding with a polymer synthetic colloid, which has various additives, coagulants, and anti-UV agents. This can avoid the yellowing problem of common epoxy, and also modify the black pigment and create the mold frosted surface.

Optical performance

GOB process has a variable thickness of the final product, and a difference in the flatness of the self-leveling colloid, which results in a thicker GOB product. This causes a more noticeable edge refraction problem when splicing on a large scale, which is commonly known as the bright line problem of the writing angle.

HCOB uses precision molding tools, which ensure that its thickness is only up to 0.2mm higher than the LED height, and the light hardly undergoes secondary refraction at the edge of the colloid.

Contrast 

The surface of the final product of the ordinary GOB process is a mirror surface, which cannot achieve a frosted or matte surface.

HCOB uses mold design and pressure molding to create a frosted surface, which is similar to matte black light. This increases the contrast of the entire screen by 40%.