E Ink has been granted a patent for a variable light transmittance sheet with electrophoretic ink and non-planar solid polymer elements. The sheet includes transparent electrodes and a suspending fluid with specific compositions, providing less than 3% haze at 20°C. GlobalData’s report on E Ink gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on E Ink, E-transaction user interfaces was a key innovation area identified from patents. E Ink's grant share as of May 2024 was 43%. Grant share is based on the ratio of number of grants to total number of patents.
Variable light transmittance sheet with low haze
The granted patent (Publication Number: US12000207B2) discloses a variable light transmittance sheet comprising a first transparent electrode, a second transparent electrode, and an electrophoretic cell containing an electrophoretic ink with charged particles suspended in an optically-transparent suspending fluid. The electrophoretic cell is bounded by optically-transparent, non-planar, solid polymer elements and walls perpendicular to the electrodes. The haze through the sheet is less than 3% at 20°C, providing a clear and transparent viewing experience.
Furthermore, the patent details the composition of the suspending fluid, the solid polymer elements, and the functionality of the polymer, such as urethane and epoxy functionality. The sheet allows for variable light transmittance by manipulating the position of charged particles within the electrophoretic cell in response to an electric field. This technology enables the sheet to switch between extreme light states, either strongly attenuating or substantially transmitting light passing through the sheet. The electrodes are positioned on glass substrates, ensuring a parallel arrangement for optimal performance of the variable light transmittance sheet.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
