Multi-component films for optical display filters
Provided are multi-component films useful as optical display filters. The optical display filters include a multi-layer stack that contains at least one organic layer. The filters have high visible light transmittance, low visible light reflection, and provide electromagnetic interference shielding.
1. An optical display filter comprising:
a transparent substrate; and
a multi-layer stack disposed on the substrate, the stack having at least four dyads, wherein at least one of the dyads is composed of:
an electrically-conductive layer; and
a transparent organic layer with a refractive index greater than 1.49; wherein the multi-layer stack disposed on the substrate has a reflectance for light having a near-normal incident angle of not greater than 8% of actinic radiation between the wavelengths of 450 nm and 650 nm, a reflectance for light having a 70° incident angle of not greater than 25% of actinic radiation between the wavelengths of 450 nm and 650 nm, a sheet resistivity of less than about 2 ohms/square, and an average electromagnetic interference shielding of at least 35 dB for frequencies in a range of 100 MHz to 1 GHz.
2. The filter of claim 1 further comprising a basecoat layer disposed between the substrate and the multi-layer stack.
3. The filter of claim 1 wherein all of the dyads comprise a transparent thin organic layer with a refractive index greater than 1.54.
4. The filter of claim 1 wherein the multi-layer stack disposed on the substrate has as average reflection of less than 3% of actinic radiation between the wavelengths of 450 nm and 650 nm, an average light transmission above 55% between the wavelengths of 450 nm and 650 nm, an average electromagnetic interference shielding of at least 35 dB for frequencies in a range of 100 MHz to 1 GHz, and wherein the filter has an infrared transmission at wavelengths greater than 800 nm of less than 2%.
5. A display panel comprising at least one of the optical filters according to claim 4 .
6. The filter of claim 1 having a sheet resistance of less than about 1.0 ohm/square.
7. The filter of claim 1 wherein the substrate comprises a polymer.
8. The filter of claim 7 wherein the polymer comprises poly(ethylene terephthalate).
9. The filter of claim 1 wherein the electrically-conductive layer comprises an elemental metal, a metal alloy, or a metal oxide.
10. The filter of claim 9 wherein the electrically-conducting layer comprises an elemental metal.
11. The filter of claim 10 wherein the elemental metal is selected from silver, copper, rhodium, ruthenium, chromium, aluminum, gold, palladium, platinum, nickel and zinc.
12. The filter of claim 11 wherein the metal is silver.
13. The filter of claim 1 wherein the organic layer is selected from polymers, organometallic materials, and organic-inorganic hybrid materials.
14. The filter of claim 13 wherein the organic layer comprises a crosslinked polymer.
15. The filter of claim 14 wherein the crosslinked polymer is formed from monomers comprising at least one acrylate.
16. The filter of claim 15 wherein the acrylate comprises a thioacrylate.
17. The filter of claim 16 wherein the thioacrylate comprises phenylthioethyl acrylate.
18. The filter of claim 1 wherein the transmission of the film does not significantly shift in observed color up to a viewing angle of 60°.
19. The filter of claim 1 wherein the organic layer further comprises at least one of an additive, filler, dye, particles, or pigment.
20. The filter of claim 1 further comprising at least one of an optically clear adhesive, an adhesion promoter, a moisture barrier, a self-cleaning layer, a corrosion barrier, a color compensation layer, a hardcoat, and an abrasion-resistant layer.
21. The filter of claim 20 wherein at least one of the optically clear adhesive, adhesion promoter, moisture barrier, self-cleaning layer, corrosion barrier, color compensation layer, the hardcoat, or abrasion-resistant layer comprises an additive, filler, dye, pigment, particles, or a combination thereof.
22. A display panel comprising at least one of the optical filters according to claim 1 .