I appreciate the idea of companies trying new things, but folding phones feel like curved TVs or 3D TV to me. A mature market whose product has become commoditized trying desperately to restart the growth train.
I am not going to predict that folding phones won't take off because you never know what will happen. However, they have a lot of hills to climb. A foldable will always be more expensive and use more battery than a regular phone. The aspect ratio of the screen is going to have to be a compromise in at least one of the two forms, if not both. A 1:1 screen does not really help anyone. Nor does a super tall screen. Then there is the issue of durability with the hinge and plastic screen. They will also always be thicker.
Those are a ton of negatives (just what I can think of off the top of my head) and the positives are of dubious value. Maybe I am not seeing it, but I am not sure have two compromised screen sizes is worth all the negatives. In a time when people are keeping phones longer and are less interested in the features, I think folding phones are going to be a tough sell.
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Like I said, where would apple get the displays they need. Samsung will want to keep this to themselves for a period of time, as its a game changing technology.
My understanding of Samsung is that is not at all how they work. Their divisions are completely separate and all do what they can to make money. One division will not hold something back to help another. Unlike Apple, Samsung is an extremely diverse company in which cellphones are only one part of. If someone wants to buy screens, chips, etc. they will definitely sell it to them.