Multilayer structure, contained PVB layer and applied display device

By high-temperature bonding of the modified PVB layer with the optical layer and adhesive layer, the problem of time-consuming back-end processes in display devices is solved, achieving higher process efficiency and effective encapsulation of the light-emitting unit.

CN120863181APending Publication Date: 2025-10-31SUMIKA TECH
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Patent Information

Application Number
CN202510943298.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-12-17
Filing Date
2025-07-09
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

In the back-end processes of self-emissive sub-millimeter LED or micro LED display devices, the resin curing and polishing processes are time-consuming, resulting in low process efficiency.

Method used

The modified PVB layer contains 40%–70% plasticizer and 30%–60% PVB resin, with a PVOH content of 5%–10%. It is bonded to the optical layer and adhesive layer at high temperature to form a multi-layer structure, which improves fluidity and adhesion and simplifies the manufacturing process.

Benefits of technology

It shortens the process time, improves the process efficiency of the display device, and ensures good coverage and gap filling of the light-emitting unit by modifying the fluidity and adhesion of the PVB layer.

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Abstract

The invention provides a multi-layer structure, a PVB (polyvinyl butyral) layer contained in the multi-layer structure, and a display device applying the multi-layer structure. The multi-layer structure comprises an adhesive layer, a polyvinyl butyral (PVB) layer, an adhesive layer, an adhesive layer and an adhesive layer, pVB) layers and an optical layer. The PVB layer is located on the first surface of the adhesive layer, and the optical layer is located on the second surface of the adhesive layer. The PVB layer comprises a PVB composition, the PVB composition comprises, by mass, 40%-70% of a plasticizer and 30%-60% of PVB resin, and the PVB resin is a polyvinyl alcohol copolymer, and the plasticizer is a plasticizer with the mass ratio of 40%-70% and the PVB resin is a polyvinyl alcohol copolymer with the mass ratio of 30%-60%. The content of PVOH is 5%-10% of the mass of the PVB resin.
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