No, "full screen" has not been registered as a trademark, so all manufacturers can use the word "full screen". However, corresponding to the definitions of the appearance of full-screen mobile phones by different manufacturers, some manufacturers have applied for appearance patents. Because the comprehensive screen technology of various companies is not uniform, there will be no patent war for comprehensive screen for the time being.
However, the comprehensive screen is the first time to mention Xiaomi (20 16), which should be true and have a wide influence. If other manufacturers dare to apply for full-screen patents, as long as Xiaomi raises objections, the probability of patents being over-examined is very small.