Light-conductive substrate with a light outcoupling structure

WO2025093476A1PCT designated stage expired Publication Date: 2025-05-08WEBASTO AG +1
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Patent Information

Application Number
PCT/EP2024/080413
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-11-02
Filing Date
2024-10-28
Publication Date
2025-05-08

AI Technical Summary

Technical Problem

Existing light-conducting substrates with light outlet structures using ink drops suffer from undesirable lighting and light fragments due to the sharply limited transitions of ink drops, leading to a halo effect that is visually striking and optically uneven.

Method used

The substrate features ink drops with irregular shapes on their drop size, which are formed using a digital printing process or inkjet procedure, preventing the formation of a visually recognizable halo and ensuring a uniform, optically even appearance during light transmission.

Benefits of technology

The irregularly shaped ink drops eliminate the halo effect, providing a diffuse and even light distribution that reduces the visibility of sharp contours and enhances the optical uniformity of the substrate, especially in vehicle glazing applications.

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Abstract

The invention relates to a substrate (1) which is formed of a light-conductive material in planar form with a first main surface (2) and an opposite second main surface (3) and has a light outcoupling structure (23) applied to the first main surface (2), wherein light which is coupled into the substrate (1) via light incoupling at at least one edge region (15) of the substrate (1) exits the substrate (1) via the second main surface (3) via light outcoupling effected by means of the light outcoupling structure (23), wherein the light outcoupling structure (23) has light-outcoupling structure points (24) applied to the substrate (1) which are formed of ink drops (25) produced from a light-reflecting ink. According to the invention, some or all of the ink drops (25) of the light outcoupling structure (23) have an irregularly shaped structure (32) at the drop circumference (29).
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Citation Information

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