The new Galaxy Note 4 features a crisper, 5.7-inch display in a metal frame, reflecting Samsung's latest design strategy to keep pace with rivals including Apple Inc, which is expected to launch its first large-screen phones in early October.
               
The new model offers accessories designed to attract gamers and an improved pen stylus and related software as a handwriting alternative to typing on a keyboard. It boasts easier to use multi-tasking features that take advantage of its large screen.
               
The Note 4 is key to a recovery by Samsung Electronics, which faced initial derision at the idea of callers holding elephantine screens up to their ears. Since the Note's introduction in 2011, it has made 5-inch and larger screen sizes the standard for high-end phones as usage shifted overwhelmingly to reading and writing texts and emails or documents, using apps, watching movies or playing games rather than calling.
               
While the new Note device appears to meet expectations on key features such as the quad high-definition display and a 16-megapixel rear-facing camera, the improvements are incremental and suggest further struggles ahead for Samsung to differentiate its product, especially with large-screen iPhones on the way.
               
Samsung also showed off a limited-edition version of the Note with a curved edge screen on one of the phone's sides, helping users to stay focused on their main screen without having to respond to calendar reminders or incoming emails.