Some recent models of the Apple iPad have a rather annoying air gap in between the display and the outer touch surface. This can be particularly frustrating for users that press hard or use the Apple Pencil regularly. It is possible to eliminate this gap in the iPad 9, at least, as demonstrated by [serg1us_eng]. (Warning: TikTok)
Doing the job well takes some finesse, however, and plenty of fancy equipment. The iPad’s front touch glass was first covered to avoid scratches during the work, and then heated to 60 C to remove it. The display was also removed, with several glued-down ribbon cables having to be carefully pried off to avoid damage. A layer of transparent material was then cut to size to fit in the gap between the display and the front glass, with the stack laminated together. Getting this result without air bubbles or dust particles spoiling the result involved the use of a heated press and a clean room, which are now widely used in phone repair shops around the world.