Many will try, few will survive, says an Asian manufacturer working on several of them

Samsung's Galaxy Tab

Two new tablet computers based on Google's (GOOG) Android operating system -- one from Samsung, the other by Toshiba -- were introduced at a trade show in Berlin this week, part of a wave of knockoff designs inspired by Apple's (AAPL) iPad.

Many of them will disappear within a year, Compal Electronics president Ray Chen told investors on Wednesday, as the new arrivals quickly discover that competing with the iPad is not as easy as it looks.

Chen should know. The giant Taiwanese original equipment manufacturer is building tablets for three of the biggest players in the market: Acer, Lenovo and Dell (DELL).

His remarks, picked up by DigiTimes, echo a report issued in late August by iSuppli's Rhonda Alexander.

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