Achromatic global turn for compact head-up display

The PB phase structure in the optical layer stack of head-up displays corrects chromatic dispersion by adjusting polarization handedness for specific wavelengths, ensuring uniform deflection and enhancing viewing quality.

WO2026131636A1PCT designated stage Publication Date: 2026-06-25ENVISICS LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ENVISICS LTD
Filing Date
2025-12-15
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing head-up displays face challenges in providing an achromatic global turn that corrects chromatic dispersion across different wavelength components, leading to inconsistent viewing quality due to wavelength-dependent deflections.

Method used

Employing a Pancharatnam-Berry (PB) phase structure in an optical layer stack to selectively correct the handedness of circular polarization for specific wavelength components, using reactive mesogen layers to achieve uniform angular deflection and polarization adjustment, thereby reducing chromatic dispersion.

Benefits of technology

The PB phase structure ensures that all wavelength components are turned by the same angle, improving viewing quality and reducing chromatic dispersion, resulting in a more consistent and accurate display output.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure EP2025087093_25062026_PF_FP_ABST
    Figure EP2025087093_25062026_PF_FP_ABST
Patent Text Reader

Abstract

A waveguide head-up display comprising an optical layer stack configured to receive a first wavefront from a waveguide. The first wavefront comprises a first wavelength component having a first circular polarization and a second wavelength component. The first wavelength component has a first value of an optical property and the second wavelength component has a second value of the optical property, the second value being different to the first value. The optical layer stack comprises a Pancharatnam-Berry, "PB", phase structure configured to apply a first optical correction and change of handedness of circular polarization to the first wavelength component of the first wavefront to form a corrected wavefront comprising the first wavelength component and the second wavelength component. The first wavelength component of the corrected wavefront has a first corrected value of the optical property and a circular polarization handedness opposite that of the first circular polarization. A difference between the first corrected value and the second value is smaller than a difference between the first value and the second value.
Need to check novelty before this filing date? Find Prior Art