Road display device, installation method, and projection method

The road display device addresses visibility issues on uneven surfaces by projecting displays with precise angular relationships and using a lighting device with a holder and diffractive optical element to ensure clear and gap-free markings.

WO2026127047A1 Publication Date: 2026-06-18DAI NIPPON PRINTING CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
DAI NIPPON PRINTING CO LTD
Filing Date
2025-12-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing road surface display technologies suffer from visibility issues due to unevenness, causing parts of the projected display to be missed by observers, particularly when the display is projected on uneven road surfaces.

⚗Method used

A road display device with an illumination device that projects a display with specific angular relationships between light rays and the road surface, ensuring the display is less likely to be obscured by surface irregularities, using a lighting device with a holder to maintain position and a diffractive optical element to project coherent light accurately.

🎯Benefits of technology

The solution effectively minimizes the visibility of gaps in the projected display, ensuring clear visibility of road markings even on uneven surfaces, enhancing safety and clarity for observers.

✦ Generated by Eureka AI based on patent content.

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Abstract

A road display device 10 comprises a lighting device 30 that irradiates a road surface 95 with light so as to project a display having a width at least in a first direction. The display has a first end portion 90a located on a first side S11 in a first direction D1. In observation from a vertical direction DN, an angle Φ1 formed by a first light beam L1 and a virtual line segment L3 is smaller than 90°, the first light beam L1 being emitted from the lighting device 30 to the first end portion 90a, the virtual line segment L3 extending from the first end portion 90a to the first side S11 along the first direction D1. In observation from a second direction D2 perpendicular to the first direction D1 and perpendicular to the vertical direction DN, an angle θ1 formed by the first light beam L1 and a perpendicular line L4 to the road surface 95 is larger than 0° and is 83.15° or smaller.
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