1. An infrared transmissive article, comprising:
an infrared (IR) transmissive substrate, and
a single layer anti-reflective (AR) sol-gel composite broadband coating on a surface of said substrate, said single layer AR coating comprising:
a first metal or semiconductor chalcogenide comprising compound, said first metal or semiconductor chalcogenide compound being essentially all in a metal or semiconductor chalcogenide form;
a second chalcogenide comprising compound different from said first chalcogenide comprising compound intermixed with said first chalcogenide comprising compound, said second metal or semiconductor chalcogenide compound being essentially all in a metal or semiconductor chalcogenide form;
wherein percentages of said first chalcogenide and said second chalcogenide in said single layer AR coating are selected provide a refractive index of said single layer AR coating that approximates the square root of a refractive index of said substrate, and
wherein said AR coating is in a highly amorphous state.
2. The article of claim 1, wherein a thickness of said AR coating is <200 nm.
3. The article of claim 1, wherein said first metal or semiconductor chalcogenide comprising compound is silica and said second metal or semiconductor chalcogenide comprising compound is titania.
4. The article of claim 1, wherein a primary particle size distribution in said AR coating has a peak at between about 2-10 nm.
5. The article of claim 1, wherein said substrate is a chalcogenide glass substrate.
6. The article of claim 5, wherein said chalcogenide glass substrate comprises a substrate having a refractive index of around 2.7, wherein said refractive index of said AR coating in a wavelength range from 1 to 5 microns is from 1.62 to 1.66.
7. The article of claim 5, wherein a % transmissivity of said coated substrate averages at least 70% over a majority of a wavelength range from 1.5 to 5 micrometers.
8. The article of claim 1, wherein said AR coating has a gradient of said refractive index across its thickness, wherein said refractive index of said AR coating is lower at its surface as compared to a bulk of said coating.
9. The article of claim 8, wherein gradient comprises a difference in said refractive index from 1 to 5% from said surface to said bulk of said AR coating.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A backlight module, comprising:
at least one back plate;
a light guide plate disposed in the back plate;
an optical film disposed on the light guide plate;
a base installed at one side of the light guide plate and comprising a plurality of corresponding holes spaced with each other;
a plurality of fasteners fastened in the corresponding holes, respectively, each of the fasteners comprising a pressing hole; and
a plurality of optical fibers for transmitting a light source and passed through the pressing holes, respectively, wherein the optical fibers are tightly fixed by the fasteners, and each of the fasteners is cylindrical and comprises a surrounding wall defining the pressing hole, a gap formed on the surrounding wall and communicated with the pressing hole, and a positioning groove surrounding a surface of the surrounding wall for engaging with the base, and a material of the fasteners is plastic or rubber.
2. The backlight module according to claim 1, wherein the radius of one end of the surrounding wall is tapered.
3. The backlight module according to claim 1, wherein the light source is sunlight.
4. A backlight module, comprising:
a light guide;
a base installed at one side of the light guide plate and comprising a plurality of corresponding holes spaced with each other;
a plurality of fasteners fastened in the corresponding holes, respectively, each of the fasteners comprising a pressing hole, respectively; and
a plurality of optical fibers for transmitting a light source and passed through the pressing holes, respectively, wherein the optical fibers are tightly fixed by the fasteners, and each of the fasteners is cylindrical and comprises a surrounding wall defining the pressing hole, a gap formed on the surrounding wall and communicated with the pressing hole, and a positioning groove surrounding a surface of the surrounding wall for engaging with the base, and a material of the fasteners is plastic or rubber.
5. A backlight module, comprising:
a base comprising a plurality of corresponding holes spaced with each other;
a plurality of fasteners fastened in the corresponding holes, respectively, each of the fasteners comprising a pressing hole, respectively; and
a plurality of optical fibers for transmitting a light source and passed through the pressing holes, respectively, wherein the optical fibers are tightly fixed by the fasteners, and each of the fasteners is cylindrical and comprises a surrounding wall defining the pressing hole, and a gap formed on the surrounding wall and communicated with the pressing hole, and a positioning groove surrounding a surface of the surrounding wall for engaging with the base, and a material of the fasteners is plastic or rubber.