Patent ID: 11912899
Assignee: SONY GROUP CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 16:
17. A method for providing a film for absorbing visible light in an optical system, the method comprising:
providing a plurality of silica nanoparticles on a surface of an object at a position relative to an optical element in the optical system to reduce stray visible light from interfering with visible light output from the optical system, wherein a surface of at least a part of the plurality of silica nanoparticles is functionalized with a plurality of pigment molecules of a Melanin compound,
wherein an average size of each of the plurality of silica nanoparticles is in a wavelength range of the visible light, and
wherein at least a part of pairs of neighboring pigment molecules of the plurality of pigment molecules is cross-linked, wherein the cross-linked is selected from the group consisting of a diamine, a dihydrazide, a borate ion, and dicarbamate.