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| Figures from registered Patent No. KR2697378, "Polarizing plate and display device including the same," co-owned by Samsung Display and Dongwoo Fine-Chem (Source: KIPRIS). |
Samsung Display and Dongwoo Fine-Chem jointly filed two patent applications titled "Polarizing plate and display device including the same" with the Korean Intellectual Property Office—one in 2023 and another in 2024. Dongwoo Fine-Chem is a wholly owned subsidiary of Japan's Sumitomo Chemical.
The original application was filed in February 2023 and registered in August 2024 as KR2697378. In August 2024, the companies filed a divisional application under No. KR10-2024-0109831, requesting examination at the time of filing.
The patents describe a single polarizing-plate structure comprising a polarizer, a panel-side high-retardation layer (Ro₁), and a viewer-side low-retardation layer (Ro₂). This arrangement suppresses color and luminance shifts over wide viewing angles while maintaining adequate brightness through polarized sunglasses.
By aligning the slow axes of the two phase-difference layers at an optimal 10°–45°, the design minimizes P- and S-polarization transmittance variation and prevents the luminance drop that occurs when a viewer's sunglasses' transmission axis is orthogonal to the polarizer's absorption axis.
Potential applications include flat-panel OLED and LCD displays, mobile devices, TVs, monitors, VR/AR headsets, and wearable or automotive displays exposed to ambient light or polarized-lens environments.
Although the two companies have filed patents on etchants and photosensitive resin compositions since 2005, these are their first joint applications to feature "polarizing plate" in the title.
By PatenTrip
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