Oppo have been teasing its under-display camera solution for three weeks now, and it might just be ready to show a prototype to the general public. The company posted a promo, reminding people about the launch on June 26 at MWC Shanghai 2019. The short 15-second video also reveals the design of the smartphone which appears to have a massive screen-to-body ratio. We already know from a previously released teaser that the front-facing camera can take pictures, but when it is turned off, the screen on top continues to have working pixels. There's also the occasional circular ring...