How long until a ps4 level $400 hybrid is possible?

[The_Liquid_Laser]

Conina said:

According to this estimate the most costly components of the PS4 were the CPU, GPU, RAM and hard drive:

A hybrid would add a display and battery.

For which of these components Sony has a "vertical monopoly"?

They aren't in the GPU, CPU, RAM or Hard drive business. They are in the memory card business, but when we look to the Vita and PSP (Memory Stick Duo), their memory solutions were never competitive to SD and MicroSD.

Their own manufacturing plants for mobile displays were shut down years ago: https://en.wikipedia.org/wiki/Sony_Mobile_Display 

The Vita displays and most Xperia displays are made by Samsung instead of Japan Display, Inc.

One of the very few Sony components in the Vita and the Xperia phones is the battery.

a) Battery is a non-trivial cost for a portable PS4.  The Switch already eats through its batter far faster than any previous Nintendo handheld.

b) There is no way I am going to go through all of Sony's holdings to answer these questions, because they own a crap ton of stuff.  If looking at this stuff is the sort of thing that interests you, then be my guest.
https://en.wikipedia.org/wiki/List_of_acquisitions_by_Sony_Corporation