iPhone 4 (3.5") top vs Galaxy S (4") bottom via EngadgetMacotakara claims that Hitatchi Displays and Sony Mobile Display Corporation have begun shipping 4-inch LCDs for a new iOS device:
According to Asian source, Hitachi Displays, Ltd. and Sony Mobile Display Corporation started to ship 4-inch LCD for new iOS device and LCD for iPad 3. These 2 companies will be merged their business with Toshiba Mobile Display Co., Ltd., as "Japan Display" in 2012 spring.
The report doesn't specify which iOS device that the screens would be used for, but the most natural choice would be the next generation iPhone. Apple has been said to be exploring the use of a 4" display for their upcoming iPhone. iLounge previously indicated that the 2012 iPhone would use a 4" display.
So far, Apple has only used a 3.5" display across its iPhone line, and there have been arguments that 3.5" may be the ideal size for one-handed use.
Top Rated Comments
The iPhone's current size is pretty close to ideal. However, if Apple can put a bigger screen into the same package, then go for it.
Another thing about screens: other phones screens just plain suck. The display appears to be farther below the touch surface. I guess Apple's work to make the screen and touch surface thinner is worth it.
Also the whole point of the current screen size is to make the whole display accessible with one hand. If you want to see movies etc on a larger screen...buy a TV.
99.9% of iphone buyers WILL NOT CARE