Search International and National Patent Collections

1. (WO2018103551) FREE-FORM-SURFACE PRISM GROUP AND NEAR-EYE DISPLAY DEVICE USING SAME

Pub. No.:    WO/2018/103551    International Application No.:    PCT/CN2017/113080
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Tue Nov 28 00:59:59 CET 2017
IPC: G02B 27/01
G02B 5/04
Applicants: BEIJING NED+ AR DISPLAY TECHNOLOGY CO., LTD.
北京耐德佳显示技术有限公司
Inventors: CHENG, Dewen
程德文
WANG, Qiwei
王其为
Title: FREE-FORM-SURFACE PRISM GROUP AND NEAR-EYE DISPLAY DEVICE USING SAME
Abstract:
A free-form-surface prism group (1) having a flat outer surface, at least comprising a main prism (10) and auxiliary prisms (20, 30), wherein the main prism (10) is used to complete a main light folding/reflection function so as to amplify a source image at a preset rate; the auxiliary prisms (20, 30) are used to fit to or get close to the main prism (10) so that an optical surface of the main prism (10) meets physical conditions for folding/reflecting rays; surfaces (201, 301) of the auxiliary prisms (20, 30) which are adjacent to the main prism (10) require no separate design, and the outermost surfaces (202, 302) are non-free-form surfaces which facilitate protective treatment and fit to an additional light control layer, thereby being able to effectively protect the main prism (10), stabilize the optical performance of the main prism (10), and improve durability of the entire prism group (1).