technews.tw/2018/09/12/...sing-technology-foreign-investment/
"...Last year, Apple iPhone X introduced 3D sensing function, and the Face ID used is structured light. The market expects that this year's new mobile phone will be fully introduced into 3D sensing function. In 2019, it also has the opportunity to import rear lens. However, the latest Japanese foreign investment report pointed out that the optical ToF technology is still immature, the power and safety are confusing, the sensor design is difficult, the test equipment is lacking, and the reliability is not enough. The estimation may be delayed until 2019..."