Display with chromatic dispersion compensation in a lightguide architecture
EP4771442A1Pending Publication Date: 2026-07-08LUMUS LTD
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- LUMUS LTD
- Filing Date
- 2025-04-10
- Publication Date
- 2026-07-08
AI Technical Summary
Technical Problem
Near-eye display systems suffer from chromatic dispersion due to non-normal orientation of the lightguide relative to the user's eye, causing color shifts and reduced image quality.
Method used
A display system with chromatic dispersion compensation in a lightguide architecture, utilizing a collimating optical arrangement and polarizing beam splitter (PBS) prism components with different Abbe numbers to introduce compensatory chromatic dispersion, ensuring image light propagates within the lightguide to counteract aberrations.
Benefits of technology
The system effectively reduces chromatic aberrations and color fringing in the projected image, improving image quality by intentionally introducing compensatory chromatic dispersion.
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Smart Images
Figure IL2025050328_23102025_PF_FP_ABST
Abstract
A display includes a lightguide (12) formed from a transparent material having parallel major surfaces for supporting propagation of collimated image light by internal reflection. An image generator (30) forms an image at an image plane, and a collimating optical arrangement includes a reflective lens and a quarter-wave plate. A polarizing beam splitter arrangement includes a PBS surface (36) at an interface between a first PBS prism component (38) and a second PBS prism component (40), the latter being optically bonded to the lightguide (12). The image light follows a folded path through the PBS and collimating optics before entering the lightguide (12). The lightguide and at least one of the PBS prism components are formed from materials with different Abbe numbers, introducing a compensatory chromatic dispersion that at least partially offsets linear chromatic aberration caused by the geometry of the lightguide with respect to the viewing direction.
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