First surface mirror with DLC coating
First Claim
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1. A projection television including a first surface mirror for reflecting at least red, green and blue light components from a source toward a lens of the television so that an image can be viewed by a viewer, the first surface mirror comprising:
- a substrate supporting a coating, wherein the coating includes at least a reflective layer, first and second dielectric layers, and a layer comprising amorphous diamond-like carbon (DLC), wherein the reflective layer reflects at least said red, green and blue light components from said source toward said lens of said television so that an image can be viewed by a viewer of said television, wherein the reflective layer is provided between the substrate and the dielectric layers, and the layer comprising DLC is provided over the reflective layer and the dielectric layers. wherein the first dielectric layer has an index of refraction value “
n”
greater than an index of refraction value “
n”
of the reflective layer and less than an index of refraction value “
n”
of the second dielectric layer, and the layer comprising DLC has an index of refraction value “
n”
no greater than the index of refraction value “
n”
of the second dielectric layer, and wherein the layer comprising DLC has an average density of at least about 2.4 gm/cm3 and at least about 40% of carbon-carbon bonds in the layer comprising DLC are sp3 type carbon- carbon bonds, and wherein the layer comprising DLC has an average hardness of at least about 10 GPa.
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Abstract
A first surface mirror includes a reflective layer (e.g., Al or Ag), at least one dielectric layer and at least one protective layer of or including high density diamond-like carbon (DLC). The high density DLC enables the protective layer to be applied at a relatively small thickness which enables undesirable color often associated with DLC to be prevented or minimized, while at the same time good protective characteristics (e.g., scratch resistance) can be realized.
112 Citations
30 Claims
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1. A projection television including a first surface mirror for reflecting at least red, green and blue light components from a source toward a lens of the television so that an image can be viewed by a viewer, the first surface mirror comprising:
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a substrate supporting a coating, wherein the coating includes at least a reflective layer, first and second dielectric layers, and a layer comprising amorphous diamond-like carbon (DLC), wherein the reflective layer reflects at least said red, green and blue light components from said source toward said lens of said television so that an image can be viewed by a viewer of said television, wherein the reflective layer is provided between the substrate and the dielectric layers, and the layer comprising DLC is provided over the reflective layer and the dielectric layers. wherein the first dielectric layer has an index of refraction value “
n”
greater than an index of refraction value “
n”
of the reflective layer and less than an index of refraction value “
n”
of the second dielectric layer, and the layer comprising DLC has an index of refraction value “
n”
no greater than the index of refraction value “
n”
of the second dielectric layer, andwherein the layer comprising DLC has an average density of at least about 2.4 gm/cm3 and at least about 40% of carbon-carbon bonds in the layer comprising DLC are sp3 type carbon- carbon bonds, and wherein the layer comprising DLC has an average hardness of at least about 10 GPa. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A mirror for use in a projection television for reflecting at least red, green, and blue light components from a source toward a lens of the television so that an image can be viewed by a viewer, the mirror comprising:
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a substrate supporting a coating, wherein the coating includes a reflective layer for reflecting light toward the lens of the television, at least a first dielectric layer, and a layer comprising diamond-like carbon (DLC) provided over the reflective layer and the first dielectric layer, and wherein the layer comprising DLC has an average density of at least about 2.4 gm/cm3 and at least about 40% of carbon-carbon bonds in the layer comprising DLC are sp3 type carbon-carbon bonds, and wherein the layer comprising DLC is from about 1-100 nm thick. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A projection television including a first surface mirror for reflecting at least red, blue and green light components from a source toward a lens so that an image can be viewed by a viewer, wherein the first surface mirror comprises:
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a glass substrate supporting a coating, wherein the coating includes a reflective layer for reflecting at least the red, blue and green light components from the source toward the lens so that the image can be viewed on the projection television, at least one dielectric layer, and a layer comprising amorphous diamond-like carbon (DLC), wherein the reflective layer is provided between the glass substrate and the dielectric layer, and the layer comprising DLC is provided over the reflective layer and the dielectric layer, and wherein the layer comprising DLC has an average density of at least about 2.4 gm/cm3, an average hardness of at least about 10 GPa, and a thickness of from 1-100 nm. - View Dependent Claims (28, 29, 30)
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Specification