US3736047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device with internal anti-reflection casting
Assignee: Optical Coating Laboratory Inc
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Filing: 1971-08-13
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Granted: 1973-05-29
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Expires: 1991-08-13
Abstract
Abstract Liquid crystal display device having first and second substantially transparent insulative plates having front and rear surfaces with said plates being arranged so that the rear surface of the first plate and the front surface of the second plate face each other. An antireflection coating is disposed on at least one of said front and rear surfaces of said front plate. A conducting coating is carried on said rear surface of said first plate and said front surface of said second plate. Means secures the first plate to the second plate so that there is a space provided between said conducting layers. A layer of liquid crystal material is disposed in said space. In the method, an antireflection coating is provided on a surface so that the pattern carried by the display device is invisible when the display device is not activated.
Inventors
- 👤 R M Gelber
- 👤 E A Small
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133502
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
17 words
A device as in claim 1 in which said second combination coating includes a dielectric reflecting stack.
Claim 2
Dependent Claim
18 words
A device as in claim 1 in which said second combination coating includes at least one antireflection layer.
Claim 3
Dependent Claim
25 words
A device as in claim 1 wherein said front and back plates are formed of glass and wherein said securing means is a glass frit.
Claim 4
Dependent Claim
84 words
A display device as in claim 1 wherein said first combination coating consists of first and second substantially transparent antireflecting layers with one of the layers being formed of a high index material and the other of the layers being formed of a low index material, said layer of conducting material being carried by the first and second antireflecting layers, said combination layer having a substantially uniform appearance throughout so that the patterns will not be visible when the display device is not activated.
Claim 5
Dependent Claim
69 words
A display device as in claim 5 wherein said layer of high index material has a quarter wave optical thickness for the design wavelength of approximately 140 nanometers and said layer of low index material has a quarter wave optical thickness for the design wavelength of approximately 193 nanometers and wherein said layer of conducting material in said first combination coating has an optical thickness of approximately 1,100 nanometers.
Claim 6
Dependent Claim
57 words
A device as in claim 6 wherein said high index material is titanium dioxide, said low index material is magnesium fluoride and said conducting material in said first combination coating is indium oxide whereby said coating is slightly bluish in color and wherein the patterns are virtually indistinguishable in the wavelength region of 400 to 700 nanometers.
Claim 7
Dependent Claim
21 words
A device as in claim 2 wherein said stack is formed of alternate layers of high and low index dielectric materials.
Claim 8
Dependent Claim
23 words
A device as in claim 8 wherein at least seven or more layers are provided in said stack to obtain the desired reflectivity.
Claim 9
Dependent Claim
31 words
A device as in claim 8 wherein the layers of high index material are formed of titanium dioxide and wherein said layers of low index material are formed of silicon dioxide.
Claim 10
Dependent Claim
32 words
A device as in claim 2 wherein the reflectivity of the dielectric stack is greater than 90 percent in the region of greatest eye sensitivity at the center of the visual spectrum.
Claim 11
Dependent Claim
15 words
A device as in claim 1 wherein the conducting layers are formed of indium oxide.
Claim 12
Dependent Claim
20 words
A device as in claim 1 together with an antireflection coating disposed on The front surface of the front plate.
References Cited (Backward Citations)
US2543793A
Cited
US2892380A
Cited
US3185020A
Cited
US3576356A
Cited
US3647280A
Cited
US3637294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |