Freeform OST-HMD system with large exit pupil diameter and vision correction capability

• DOI: 10.1364/prj.440018
• Publication Date: 2021-11-02T17:22:51Z
• Authors: Dewen Cheng; Jiaxi Duan; Hailong Chen; He Wang; Danyang Li; Qiwei Wang; Qichao Hou; Tong Yang; Weihong Hou; Donghua Wang; Xiaoyu Chi; Bin Jiang; Yongtian Wang
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology

Compactness and light weight, large exit pupil diameter distance, small distortion for virtual image, see-through paths are pivotal factors to achieve a better, wearable experience of optical head-mounted displays (OST-HMDs). In addition, efficiency the image path is an important factor heat dissipation in HMD devices. This paper presents new type OST-HMD system that includes three wedge-shaped freeform prisms two symmetric lenses. Based on 0.71 in. microdisplay, prototype with diagonal field view (FOV) 45.3°, F -number ( /#) 1.8, size <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mn>12</mml:mn> <mml:mtext> </mml:mtext> <mml:mi>mm</mml:mi> <mml:mo>×</mml:mo> <mml:mn>8</mml:mn> </mml:mrow> </mml:math> , eye relief 18 mm demonstrated. The maximum value final 0.6% 0.4% path, respectively. overall dimension per no larger than id="m2"> <mml:mn>30</mml:mn> <mml:mo stretchy="false">(</mml:mo> <mml:mtext>width</mml:mtext> stretchy="false">)</mml:mo> <mml:mn>40</mml:mn> <mml:mtext>height</mml:mtext> <mml:mn>14</mml:mn> (thickness), weight module including lenses, holder, microdisplay 12.8 g. up 50% higher those other solutions.