When we talk about replacement screens, it's important to know that the same compatible model for a mobile can be manufactured in two different ways: using COG (Chip on Glass) technology or COF (Chip on Flex) technology. These two technologies have key differences, both in design and how they affect the screen size.

For example, COF screens usually maintain the original dimensions of the mobile because the controller chip is installed on a flexible ribbon outside the glass. On the other hand, COG screens are typically about 2 mm smaller at th...