Following CNET en Espanol's exclusive report on Dec. 6, Huawei has officially announced the Nova 4 -- one of the first in a wave of phones with a circular "notch" that's expected to debut in 2019.

In contrast to the wide "eyebrow" notch originated on the Essential Phone and popularized by Apple's iPhone X, the Nova 4's front-facing camera sits in a small, circular cutout in the upper-lefthand corner of the display. The O-shaped hole is nearly invisible when the phone is off or the display is showing a black image.

Like the eyebrow notch, this O-shaped design is part of an effort to expand a phone's usable screen space to the edges while leaving room for the front-facing camera and other important sensors. Slimmer bezels rimming the phone gives people more screen space for reading news and watching videos, without having to increase the size of the device.

Huawei is one company that's experimented with alternatives to the traditional notch. The P20, introduced in March, lets you turn off the notch in the phone's settings. And the company has another phone with a hole-punch design in the works -- the Honor View 20, which, like the Nova 4, has a 48-megapixel camera -- is scheduled to debut in China on Dec. 26 and globally on Jan. 22.

Samsung also has a hole-punch design, which it calls the Infinity-O display. Rumored to appear on the forthcoming Galaxy S10, it's also in use on the Galaxy A8S. Lenovo may use a similar O-shaped cutout on its rumored Z5S.

For now, the Nova 4 is on sale exclusively in Asia, but the company plans to unveil it in the US in January at CES 2019.