The smartphone industry is consistently evolving and the race to get a true full-screen device is heating up. We’ve have seen all sorts of designs aimed at improving the screen ratio of smartphones. It all started with a notch, then waterdrop design, pop-up camera, periscope structure, sliding design, and most recently, the punch-hole design. Now, it appears that Oppo has gotten a breakthrough with the obstruction caused by the front camera of smartphones. In a Twitter video, the company revealed the world’s first under-display camera technology. This time, the camera sensor is invisible.