Transparent thin film heater and product using the same

By optimizing the design of the transparent substrate and OCA adhesive layer, the color pattern problem of the silver nanowire conductive thin film heater under polarization conditions was eliminated, improving its optical performance and stability.

CN121531503BActive Publication Date: 2026-07-03ZHEJIANG DAHUA TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG DAHUA TECH CO LTD
Filing Date
2026-01-15
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

When silver nanowire conductive films are used as transparent thin-film heaters, they have high requirements for thermal stability, chemical stability and optical performance, and they are prone to color patterns under polarization conditions, which limits their application.

Method used

By optimizing the polarization of the transparent substrate and the stress of the OCA adhesive layer, the stacking method, refractive index, and thickness of the A and B layers in the functional film are designed. Combined with opening through holes in the OCA adhesive layer and filling them with resin layers, color patterns are eliminated.

Benefits of technology

It effectively reduces the phase difference between S-polarization and P-polarization of the transparent substrate, eliminates color streaks, and maintains the transmittance and stability of the transparent thin film heater.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to a transparent thin-film heater and products using the transparent thin-film heater. The transparent thin-film heater includes a functional film layer, a transparent substrate, a silver nanowire film layer, and a protective adhesive layer stacked sequentially. The functional film layer includes an A layer and a B layer alternately stacked on the transparent substrate. Both layers A and B are inorganic oxide layers, with the refractive index of layer A being 1.7-1.78 and the refractive index of layer B being 1.62-1.66. The thicknesses of layers A and B exhibit a non-periodic variation, and the total number of layers A and B is greater than or equal to 20. The protective adhesive layer includes an OCA adhesive layer and a resin layer. The OCA adhesive layer has through-holes along its thickness direction, and the resin layer fills the through-holes. The resin layer has a melting point of 50℃-100℃ and a refractive index of 1.48-1.5. This invention effectively eliminates color streaks by simultaneously optimizing the polarization of the transparent substrate itself and the stress during the bonding of the OCA adhesive layer.
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