Patent US2867142A successfully refreshed from Google Patents.
Patent EP0263541A2 successfully refreshed from Google Patents.
EP0263541A2
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EP
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A method of manufacturing a display device and a display device made by the method
Assignee: Koninklijke Philips NV
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Filing: 1987-08-31
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Granted: —
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Expires: 2007-08-31
Abstract
Abstract The viewing of display devices such as cathode ray tubes can be enhanced by providing an anti-reflection coating on the outer surface of the faceplate panel. In accordance with the present invention the anti-reflection coating comprises at least a three layer interference filter evaporated on a faceplate panel, the external surface of which may be mechanically roughened. The manufacture of the coating can be speeded-up substantially by selecting high and low refractive index materials which can be evaporated at ambient temperatures and subsequently hardened by high temperature annealing outside the evaporation apparatus. The annealing is carried out most conveniently during the standard processing of a cathode ray tube.
Inventors
- 👤 Johannes Cornelis Norbertus Rijpers
- 👤 Henricus Maria De Vrieze
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:02
CPC Classifications
H; H01; H01J; H01J9/00; H01J29/00; H01J29/86; H01J29/89; H01J29/896; C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3417; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; G02B5/00; G02B5/20; G02B5/28; G02B5/285; H01J2229/00; H01J2229/89; H01J2229/8913; H01J2229/8918
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
122 words
A method of making a display device, comprising providing a hardened anti-reflection coating on an external surface of a faceplate panel, said coating being provided by vacuum evaporating at least 3 filter layers on to the faceplate panel in an evaporation apparatus which is at ambient temperature, the material of one of said layers having a high refractive index with respect to that of the material of the faceplate panel and the material of another one of said layers having a low refractive index with respect to that of the material of the faceplate panel, the materials comprising said layers having a medium degree of hardness after evaporation, and hardening said layers by annealing outside the evaporation apparatus at an elevated temperature.
Claim 2
Independent Claim
122 words
A method of making a display device, comprising providing a hardened anti-reflection coating on an external surface of a faceplate panel, said coating being provided by vacuum evaporating at least 3 filter layers on to the faceplate panel in an evaporation apparatus which is at ambient temperature, the material of one of said layers having a high refractive index with respect to that of the material of the faceplate panel and the material of another one of said layers having a low refractive index with respect to that of the material of the faceplate panel, the materials comprising said layers having a medium degree of hardness after evaporation, and hardening said layers by annealing outside the evaporation apparatus at an elevated temperature.
Claim 3
Dependent Claim
17 words
A method as claimed in Claim 1, characterized in that the high refractive index material comprises Nb₂O₅.
Claim 4
Dependent Claim
19 words
A method as claimed in Claim 1 or 2, characterized in that the low refractive index material comprises SiO₂.
Claim 5
Dependent Claim
24 words
A method as claimed in any one of Claim 1 to 3, characterized in that the outer surface of the faceplate is mechanically roughened.
Claim 6
Independent Claim
31 words
A method as claimed in any one of Claims 1 to 4, characterized in that the annealing of said layers is carried out during the normal processing of the display device.
Claim 7
Independent Claim
28 words
A method as claimed in any one of Claims 1 to 5, characterized in that the faceplate comprises a mixed alkali glass substantially free of lead oxide (PbO).
Claim 8
Independent Claim
65 words
A method as claimed in any one of Claims 1 to 6, characterized in that four filter layers are deposited on the faceplate panel, alternate ones of the filter layers being of material(s) having a high refractive index and the remainder being of material(s) having a low refractive index, and in that a first layer applied to the faceplate panel has a high refractive index.
Claim 9
Dependent Claim
25 words
A method as claimed in Claim 7, characterized in that the material of the second layer has a refractive index of between 1.4 and 1.8.
Claim 10
Dependent Claim
85 words
A method as claimed in Claim 7 or 8, characterized in that the thickness of each of said layers is related to the refractive indices of the materials evaporated and in the case of a four layer anti- reflection coating the first and second layers each have a thickness of the order of λ/8, the third layer has a thickness of the order of λ/2 and the outermost layer has a thickness of the order λ/4, where λ is equal to a desired central wavelength.
Claim 11
Dependent Claim
76 words
A display device having an optically transparent faceplate, an anti-reflection coating on an external surface of the faceplate, the anti-reflection coating comprising at least 3 evaporated layers which have been hardened by annealing, the material of one of said layers having a high refractive index with respect to that of the material of the faceplate and another one of said layers having a low refractive index with respect to that of the material of the faceplate.
Claim 12
Dependent Claim
76 words
A display device having an optically transparent faceplate, an anti-reflection coating on an external surface of the faceplate, the anti-reflection coating comprising at least 3 evaporated layers which have been hardened by annealing, the material of one of said layers having a high refractive index with respect to that of the material of the faceplate and another one of said layers having a low refractive index with respect to that of the material of the faceplate.
Claim 13
Dependent Claim
18 words
A display device as claimed in Claim 10, characterized in that the high refractive index material is Nb₂O₅.
Claim 14
Dependent Claim
20 words
A display device as claimed in Claim 10 or 11, characterized in that the low refractive index material is SiO₂.
Claim 15
Dependent Claim
23 words
A display device as claimed in Claim 10, 11 or 12, characterized in that the outer surface of the faceplate is mechanically roughened.
Claim 16
Dependent Claim
69 words
A display device as claimed in any one of Claims 10 to 13, characterized in that the coating consists of four layers of which the first and second layers have a thickness of the order of λ/8, the third layer has a thickness of the order of λ/2, and the outermost layer has a thickness of the order of λ/4, where λ is equal to a desired central wavelength.
Claim 17
Dependent Claim
44 words
A display device as claimed in any one of Claims 10 to 14, characterized in that the faceplate comprises the faceplate panel of a cathode ray tube and the material of the faceplate comprises a mixed alkali glass substantially free of lead oxide (PbO).
References Cited (Backward Citations)
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