In recent years, the imaging prowess of smartphones worldwide has witnessed a continuous enhancement, with their imaging systems evolving from algorithmic approximations of optical phenomena to genuine, physically-backed optical effects. As a pinnacle of imaging technology, the VA variable aperture is propelling the transformation of mobile imaging from 'computational photography' to 'optical photography'. This article will comprehensively explore the physical essence of aperture, the conceptual framework of F-number, the technical roadmap and pivotal performance metrics of VA variable aperture, as well as a systematic approach to addressing the four primary imaging challenges: low-light conditions, intense lighting, depth of field control, and video recording. It will particularly highlight how AWinic's SmartHolding closed-loop driving solution surmounts industry hurdles such as power consumption, temperature-induced drift, and longevity.