Optical light guiding element for polarization encryption
Patent Information
- Application Number
- DE602020044660
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2020-11-10
- Publication Date
- 2025-01-08
- Estimated Expiration
- 2040-11-10
AI Technical Summary
Conventional lightguide optical elements maintain polarization state through total internal reflection, leading to undesirable phase shifts and changes in light reflection when dealing with unpolarized light, which affects image quality in applications like Head Mounted Displays.
A lightguide optical element with a transparent substrate and parallel external surfaces, featuring a polarization scrambling coating with a high refractive index on at least one external surface and an anti-reflective coating to increase phase shift between s-polarized and p-polarized components, reducing reflections and maintaining unpolarized light state.
The solution effectively scrambles polarization, reducing reflections and maintaining the unpolarized state of light, enhancing image quality and transmittance in applications like HMDs by increasing phase shift and reducing reflections across various angles and wavelengths.