NEAR-INFRARED NARROWBAND FILTER AND MANUFACTURING METHOD THEREFOR

The present disclosure provides a near-infrared narrowband filter (5) and a manufacturing method therefor. The filter (5) includes: a substrate (11); a set of narrowband pass films (12), disposed at a first side of the substrate (11); and a set of wideband pass films (13) or a set of longwave pass films (13). The set of wideband pass films (13) is disposed at a second side of the substrate (11) opposite to the first side, a passband of the set of wideband pass films (13) is wider than that of the set of narrowband pass films (12), the set of longwave pass films (13) is disposed at the second side of the substrate (11) opposite to the first side, and a passband of the set of longwave pass films (13) is wider than that of the set of narrowband pass films (12). The set of narrowband pass films (12) includes a high refractive index layer (121) having a refractive index greater than 3 and a low refractive index layer (122) having the refractive index less than 3 within a wavelength range of 780 nm to 3000 nm. A reflection color of the near-infrared narrowband filter (5) in a CIE xyz coordinate system satisfies: x < 0.509, y < 0.363, and z < 50%. The solution of the present disclosure may obtain a near-infrared narrowband filter (5) having diversified reflection colors, low reflection energy intensity, and low reflection color brightness, thereby meeting the application requirements of an under-screen device in the full screen of a mobile phone and an on-board device.