Nippon Sheet Glass has filed a patent for a display panel with a chemically strengthened glass plate and an optical layer. The glass plate has a deeper compressive stress layer on its second surface, and the optical layer is layered on top. GlobalData’s report on Nippon Sheet Glass 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 Nippon Sheet Glass, vacuum insulated glazing was a key innovation area identified from patents. Nippon Sheet Glass's grant share as of September 2023 was 32%. Grant share is based on the ratio of number of grants to total number of patents.
Chemically strengthened display panel with layered optical cover member
A recently filed patent (Publication Number: US20230258969A1) describes a display device with a unique cover member. The display device includes a display panel and a cover member placed on top of the display panel. The cover member consists of a chemically strengthened glass plate with two surfaces, where the depth of a compressive stress layer is greater in the second surface compared to the first surface. An optical layer is layered on the second surface of the glass plate, facing the outside.
The glass plate used in the cover member is manufactured using a float process, and the concentration of tin oxide in the first surface is higher than that in the second surface. The optical layer is an organic-inorganic composite film. It contains a matrix and particles, with the particles forming protrusions and depressions on the surface of the optical layer opposite to the second surface. The optical layer has a first region where the particles are piled up in the thickness direction of the layer, and a valley-shaped second region surrounding or surrounded by the first region.
The particles in the optical layer are primarily plate-shaped particles, with a thickness ranging from 0.3 nm to 3 nm and a main surface average diameter ranging from 10 nm to 1,000 nm. The main surfaces of the plate-shaped particles are oriented parallel to the second surface of the glass plate. The height difference between the highest and lowest portions of the optical layer, measured from the second surface of the glass plate, is at least three times the average particle diameter.
The surface of the optical layer has specific roughness characteristics. The average length of roughness curve elements (Rsm) is more than 0 µm and up to 35 µm, while the arithmetic average roughness (Ra) falls within the range of 20 nm to 120 nm. In contrast, the second surface of the glass plate has an Ra of 10 nm or less.
The matrix in the optical layer primarily consists of silicon oxide. The glass plate itself has a thickness ranging from 0.5 to 3 mm.
In addition to the display device, the patent also covers a cover member that can be used in a display device. This cover member includes a glass plate manufactured using a float process, with a higher concentration of tin oxide in the second surface compared to the first surface. An optical layer is layered on the second surface of the glass plate, facing the outside.
Overall, this patent describes a display device with a unique cover member that includes a chemically strengthened glass plate and an optical layer with specific roughness characteristics and particle distribution.
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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.
