Method for producing a holographic optical element

US10921751B2 · kind B2 · utility

Assignees

• LG Display Co., Ltd. · KR
• Covestro Deutschland AG · DE

Inventors

• Hyungseok Bang · Goyang-si, KR
• Heejin Im · Paju-si, KR
• Guensik Lee · Seoul, KR
• Friedrich-Karl Bruder · Krefeld, DE
• Thomas Fäcke · Leverkusen, DE
• Marc-Stephan Weiser · Leverkusen, DE
• Rainer Hagen · Leverkusen, DE
• Thomas Rölle · Leverkusen, DE
• Horst Berneth · Leverkusen, DE
• Dennis Hönel · Wichterich, DE
• Günther Walze

Key dates

• Filing date: Aug 8, 2018
• Grant date: Feb 16, 2021
• Expiry date: Aug 20, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2270/11
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to a method for producing a holographic optical element by providing a recording stack comprising at least one recording element laminated on at least one supporting element, irradiating at least a part of the recording stack with at least one recording beam in an irradiating step, wherein during the irradiating step, the recording stack bends, providing a bending deviation threshold for the recording stack, and adjusting at least one first process parameter such that an expected maximum bending deviation of the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behaviour of the recording stack during the irradiating step.