October 26, 2023 at 9:30 AM

SID Shanghai Student Branch held the student branch Forum in the fourth quarter of 2023, and invited Wang Bo from the 3D Display Laboratory of Shanghai Jiao Tong University to share the academic report of "Multi-plane Near-eye Display Based on Geometric Phase Optics". At the same time, Xu Chao from Shanghai Jiao Tong University was invited to share the academic report of "Holographic near-eye Display based on wave front reconstruction". More than 10 members of SID Shanghai Student Branch attended the presentation. Zhang Han, Chairman of SID Shanghai Student Branch, presided over the meeting.

During the meeting, Bo Wang introduced geometric phase optical devices and their applications in near-eye displays. Due to their polarization dependence, geometric phase lenses can act as concave lenses for left-handed circularly polarized light and convex lenses for right-handed circularly polarized light. They can also allow light to pass through directly by applying a certain voltage. Therefore, by combining two geometric phase lenses with different focal lengths and applying the appropriate voltage, it is possible to control the combined lens to switch between four focal lengths. After understanding the basic principles and properties of geometric phase optical devices, other members showed great interest in the practical applications of this device. Bo Wang mentioned that, there are some issues to be addressed such as chromatic aberration, spherical aberration, and diffraction efficiency before they can be used in practical applications.

Subsequently, Chao Xu introduced a modified unsupervised vision transformer (ViT) network for high-fidelity computer-generated holography. Compared to a conventional CNN-based network (U-Net), our network demonstrates a better capability of capturing global features during CGH calculation. Replacing the self-attention layers with global filter layers makes this modified ViT more efficient to generate phase-only holograms. The participants shared and discussed the details and application prospects enthusiastically.

Finally, the students took a group photo, and the academic report was successfully concluded.

At 14:00 on October 18, 2021, a seminar "Learning a Century of Party History with Predecessors and Talking about New Displays with Youth" was held at Holiday Inn Shanghai Jinshan.The speaker of this conference is Liang Xinqing, secretary general of the LCD branch of China Optics and Optoelectronics Industry Association. The guests present at this conference was Professor Baizhe Zhang   of Tsinghua University, Yuanfang Lin , director of the Special Committee of China Electronics Video Association, and Tong   Yuan, vice president of China Electronic Materials Industry Association., Wenjin Xue , Vice President of Nanjing Flat Panel Display Industry Association, Professor Zheng Xu from Beijing Jiaotong University, Professor   Yi Wang from Peking University, etc., and Professor Jiao   Li   from Shanghai University presided over the meeting.More than 20 students attended this conference, from Fudan University, Shanghai Jiaotong University, Tongji University and Shanghai University.

At 13:30 pm on September 18, 2019, SID Shanghai Student Branch and SID Beijing Branch East District jointly invited Dr. He Ziqian to the conference room 202, Building 1, Telecom Group Building, Minhang Campus, Shanghai Jiao Tong University, to give a title of "The Latest Development of Liquid Crystal Devices"The academic report is also used as the academic exchange meeting of the student branch this quarter.Professor Li Yan and more than ten students from the SID Student Branch attended this academic report meeting, presided over by Li Xiang, the chairman of the SID Shanghai Student Branch.

At 15:30 pm on July 26, 2019, SID Shanghai Student Branch and SID Beijing Branch East District jointly invited Professor Hu Wei to the atrium conference room on the fourth floor of Building 1, Telecom Group Building, Minhang Campus, Shanghai Jiao Tong University."Optical field control technology and application of oriented liquid crystal" academic report.