P‐32: Double‐Path Pancake Optics with Wider FoV

We propose highly light efficient pancake Head Mounted Display (HMD) optics named “Double path (DP) pancake optics”, which has 1.8 times higher light efficiency than conventional one. In previous works, we fabricated several prototypes with 90 deg Field Of View (FOV), focusing on compactness. However, the optics with wider FOV is necessary for application in various HMD products. DP pancake optics requires symmetric design, which seems a big burden for achieving wider FOV. Through optical simulation, we finally have found how to achieve wider FOV while maintaining high Modulation Transfer Function (MTF) properties. We introduce our 105 deg FOV prototype along with optical simulation and the evaluation result.