Antireflective film-attached transparent substrate, and display apparatus using same
Provided is an antireflective film-attached transparent substrate, including a transparent substrate having first and second principal surfaces and an antireflective film formed on the first principal surface of the transparent substrate, in which the antireflective film has a luminous reflectance being 1% or lower, and the antireflective film-attached transparent substrate has a transmittance being 85% or higher over the whole wavelength range of from 700 nm to 950 nm and has a reflectance being maximum in a wavelength range of from 750 nm to 900 nm in a reflection spectrum of a wavelength range of from 450 nm to 950 nm.
1. An antireflective film-attached transparent substrate, comprising a transparent substrate having first and second principal surfaces and an antireflective film on the first principal surface of the transparent substrate,
wherein the antireflective film has a luminous reflectance being 1% or lower,
wherein the antireflective film-attached transparent substrate has a transmittance being 85% or higher over the whole wavelength range of from 700 nm to 950 nm and has a reflectance being maximum in a wavelength range of from 750 nm to 900 nm in a reflection spectrum of a wavelength range of from 450 nm to 950 nm,
wherein the antireflective film has a multilayer structure consisting of a high refractive index layer and a low refractive index layer provided alternately up to from four to ten layers in total, wherein within the multilayer structure the high refractive index layer and the low refractive index layer are in direct physical contact with each other,
wherein the antireflective film-attached transparent substrate further comprises an antifouling film as the outermost layer, and the antifouling film comprises a fluorine-containing organosilicon compound,
wherein the outermost layer of the multilayer structure is a SiO 2 layer and the antifouling film is in direct physical contact with the SiO 2 layer, and
wherein each of the high refractive index layers and the low refractive index layers mainly comprises at least one oxide selected from the group consisting of oxides of Si, Nb, Ti, Zr, Ta, Al, Sn, and In, or mainly comprises at least one nitride selected from the group consisting of nitrides of Si and Al.
2. The antireflective film-attached transparent substrate according to claim 1 ,
wherein each of the high refractive index layers is a layer mainly comprising an oxide of Nb, and
wherein each of the low refractive index layers is a layer mainly comprising an oxide of Si.
3. The antireflective film-attached transparent substrate according to claim 1 ,
wherein the transparent substrate is a glass substrate.
4. The antireflective film-attached transparent substrate according to claim 3 ,
wherein the glass substrate is a chemically-strengthened glass substrate.
5. The antireflective film-attached transparent substrate according to claim 3 ,
wherein the glass substrate has an antiglare layer on the first principal surface of the glass substrate, and the antireflective film is on the antiglare layer.
6. The antireflective film-attached transparent substrate according to claim 1 ,
further comprising a light-blocking layer on a peripheral edge of the second principal surface of the transparent substrate,
wherein at least a part of the light-blocking layer has a region with an internal transmittance being 80% or higher at a wavelength range of from 800 nm to 950 nm.
7. A display apparatus comprising:
the reflective film-attached transparent substrate as described in claim 1 ,
an infrared-ray sensor, and
a display panel.