Hitachi had one patents in connectivity during Q4 2023. The patent filed by Hitachi Ltd in Q4 2023 describes a light guiding plate with an incidence diffraction grating for diffracting light and an emission diffraction grating for emitting diffracted light. The emission diffraction grating has a mesh-like grating pattern formed from intersecting parallel straight line groups with equal pitch. A line region consisting of only one of the straight line groups is provided between the incidence diffraction grating and the mesh-like grating pattern. GlobalData’s report on Hitachi gives a 360-degreee view of the company including its patenting strategy. Buy the report here.
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Hitachi grant share with connectivity as a theme is 0% in Q4 2023. Grant share is based on the ratio of number of grants to total number of patents.
Recent Patents
Application: Light guiding plate, light guiding plate module, and image display device (Patent ID: US20230400691A1)
The patent filed by Hitachi Ltd. describes a light guiding plate with an incidence diffraction grating to diffract light and an emission diffraction grating to emit diffracted light. The emission diffraction grating has a mesh-like grating pattern with intersecting parallel straight line groups of equal pitch, separated by a line region. A reflective coating is applied to the incidence diffraction grating and part of the line region.
The light guiding plate is made of a plastic substrate with a concave-convex mesh-like grating pattern and a reflective coating in a continuous region. The pitch of the diffraction gratings is equal, and the incidence diffraction grating is a reflection-type allowing light to be reflected and diffracted inside the substrate. The line region can have a V-shape configuration and a gap between the parallel straight line groups, with the length of the line region being related to the thickness of the plate. The patent also covers a module made by stacking multiple light guiding plates and an image display device using the light guiding plate module with a projector emitting light onto the incidence diffraction grating.
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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.
