Japan Display. has filed a patent for a display device with improved durability during manufacturing. The device includes an exposure protection layer for each sub-pixel to prevent deterioration when exposed to solvents or atmosphere during photolithography. GlobalData’s report on Japan Display gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Japan Display, Under-screen fingerprint recognition was a key innovation area identified from patents. Japan Display's grant share as of January 2024 was 61%. Grant share is based on the ratio of number of grants to total number of patents.

Display device with exposure protection layer for each sub-pixel

Source: United States Patent and Trademark Office (USPTO). Credit: Japan Display Inc

The patent application (Publication Number: US20240040818A1) describes a display device with a unique structure. The device includes a substrate with multiple pixels, each containing sub-pixels. These pixels consist of a lower electrode, an organic EL layer with an emission layer emitting different colors for each sub-pixel, and an upper electrode. An exposure protection layer with transparency and conductivity is placed between the organic EL layer and the upper electrode, with no emission layer between them. Additionally, the organic EL layer can have a tandem structure with multiple layers of the emission layer for each sub-pixel.

Furthermore, the display device may include a bank separating adjacent sub-pixels and various layers within the organic EL layer, such as hole injection, transport, blocking, emission, charge generation, and electron transport layers. The method for manufacturing the display device involves forming the lower electrode, organic EL layer, exposure protection layer, and upper electrode in sequence, ensuring no emission layer is present between the exposure protection layer and the upper electrode. This innovative design aims to improve the performance and efficiency of display devices by enhancing color emission and protection layers, ultimately providing a high-quality viewing experience for users.

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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.