After examining the main board of the iPhone 3G (See related article), the engineers and Nikkei Electronics Teardown Squad directed their attention from the lower part of the chassis to its upper part (display part) composed mainly of a chassis, touch panel and LCD panel.

"Contrary to the lower part of the chassis, it has fewer screws," said an engineer. "I think it's easy to take it apart."

Only six screws were used on the display part. After removing them, we took out the LCD panel from the chassis.

"In the iPhone 3G, the LCD panel and the touch panel are not integrated," said an engineer with a look of surprise.

In the iPhone 2G, its LCD panel and touch panel were attached together by a glue film. This method can suppress outer light reflection and, thus, improve the visibility, compared with the method in which air comes in between an LCD panel and touch panel. On the other hand, it increases production costs and may reduce yields.

"Maybe, Apple gave priority to the cost reduction over the display performance," an engineer said.

The thickness of the LCD panel, including a metal sheet that was probably used for reinforcement, is about 2.2mm.

"This is not particularly thin compared with the thicknesses of the LCD panels used in recent Japanese mobile phones," an engineer said.

We have almost finished the disassembly, and the positions and compositions of the parts have already been checked. The iPhone can no longer be reintegrated.

iPhone Teardown Video (Part 4) (Japanese, 2:04)