Near-infrared narrow-band filter and manufacturing method thereof

Abstract

The application provides a near-infrared narrow-band filter and a manufacturing method thereof. The filter comprises a substrate, a narrow-band pass film system arranged at a first side of the substrate, and a broadband pass film system or long-wave pass film system. The broadband pass film system is arranged at a second side, being opposite to the first side, of the substrate; the pass band of the broadband pass film system is wider than that of the narrow-band pass film system; the long-wave pass film system is arranged at the second side, being opposite to the first side, of the substrate;and the pass band of the long-wave pass film system is wider than that of the narrow-band pass film system. The narrow-band pass film system includes a high refractive index layer having the refractive index being larger than 3 within a wavelength range of 780 to 3000nm and a low refractive index layer having the refractive index being less than 3. The reflected color of the near-infrared narrow-band filter meets the following relationships in the CIE xyz coordinate system: x is less than 0.509, y is less than 0.363, and z is less than 50%. Therefore, the near-infrared narrow-band filter having advantages of diversified reflection colors, low reflection energy intensity, and low reflection color brightness can be obtained; and application demands of the under-screen device and vehicle-mounted device in the full screen of the mobile phone can be satisfied.

Description

technical field [0001] The present application relates to the field of optical elements, in particular to a near-infrared narrow-band filter and a manufacturing method. Background technique [0002] With the advancement and development of science and technology, optical filters are widely used in some terminals with face recognition or gesture recognition functions, such as smart phones, car lidar, security access control, smart home, virtual reality / augmented reality / mixed reality , 3D somatosensory games, 3D camera and display and other terminal equipment. [0003] However, when existing optical filters are used in terminal equipment, there will be a problem of light reflection. Therefore, optical filters with better performance are required to be better applied to terminal equipment. Contents of the invention [0004] In view of the technical problems existing in the prior art, the embodiments of the present application provide a near-infrared narrow-band filter and a ...

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Problems solved by technology

[0003] However, when the existing optical filters are used in terminal equipment, there will be problems of light reflection. Therefore, optical filters with better performance are required to be better applied to terminal equipment.

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