Dewen Cheng


Dewen Cheng

Beijing Institute of Technology，Professor


Dewen Cheng, born in 1982 in Wuyuan, Jiangxi Province, holds a PhD. He is a Professor and PhD Supervisor at the School of Optoelectronics, Beijing Institute of Technology, and a National-Level Leading Talent. He has long been engaged in research on free-form surface optics and VR/AR head-mounted displays, and is one of the earliest scholars in China to pioneer research in this field. He has presided over more than 20 national-level projects including the 973 Program, the 863 Program and the National Key R&D Program, and has been granted more than 100 invention patents in China and abroad.

He founded Beijing Nedgia Display Technology Co., Ltd. in 2015, focusing on products such as AR optical display modules and eye-protecting display solutions. The enterprise has been accredited as a National-Level Specialized, Sophisticated, Unique and Novel "Little Giant" enterprise, selected into the China VR Top 50 for many times and won the Product Gold Award at the World VR Conference. He has pioneered a new category of optical equipment for vision prevention and control for children and adolescents.


VR/AR Optical System Design: Principles and Engineering Processes

Abstract：

  1. Top-Level Architecture & Metrics Definition
    Covers background introduction, classification of mainstream technical approaches (VR/AR), and the definition logic and trade-offs of key system metrics such as FOV, PPD, and Eye-box.

  2. Freeform Surface AR: Aberration Correction & Stray Light Analysis
    Delves into the principles of freeform surface design, focusing on aberration balancing strategies in off-axis systems, as well as the causes and analysis methods of stray light.

  3. VR Pancake: Folded Optical Path & Ghost Reflection Review
    Analyzes the polarization multiplexing mechanism of Pancake optics, providing an in-depth examination of ghost reflection generation paths and suppression solutions in folded optical paths.

  4. AR Waveguide: Physical Mechanisms & Diffraction Design
    Transitions from geometric optics to physical optics, explaining the principles of waveguide transmission and design logic.

  5. Implementation Loop: Precision Manufacturing & System Testing
    Explores ultra-precision machining processes for freeform surfaces and waveguides, as well as system-level optical testing standards from components to full devices.