US4757234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent display device
Assignee: Futaba Corp
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Filing: 1987-05-04
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Granted: 1988-07-12
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Expires: 2007-05-04
Abstract
Abstract A fluorescent display device which is capable of substantially reducing reflection by wiring conductors and anode conductors to significantly improve visibility in reading of a display segment. The fluorescent display device is constructed in a manner to arrange anode conductors and wiring conductors each formed of a metallic film through a colored antireflection film on a substrate.
Inventors
- 👤 Youichi Ikuta
- 👤 Hiroshi Watanabe
- 👤 Kiyoshi Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:46
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
A fluorescent display device comprising: a light-permeable insulating substrate; a colored antireflection thin film arranged on said light-permeable insulating substrate; wiring conductors and light-permeable anode conductors arranged in first and second areas respectively on said antireflection film, said wiring conductors and anode conductors being formed of a metallic film; said colored antireflection thin film and said light-permeable anode conductors being divided into a number of fragments for delineating display indicia and formed into similar patterns on said insulating substrate so that said thin film overlies all of said anode conductors and occurs nowhere else in said second area and so that portions of said substrate are left exposed in said second area; and a phosphor layer deposited on each of said anode conductors in said exposed portions of said substrate which phosphor layer is adapted to emit light upon impingement of electrons emitted from a filamentary cathode thereon; thereby light emitted from said phosphor layer being observed from the other surface of said light-permeable insulating substrate through said substrate; and said color antireflection thin film acting to reduce the specular reflection of external light from said anode conductors and said wiring conductors.
Claim 2
Dependent Claim
192 words
A fluorescent display device comprising: a light-permeable insulating substrate; a colored antireflection thin film arranged on said light-permeable insulating substrate; wiring conductors and light-permeable anode conductors arranged in first and second areas respectively on said antireflection film, said wiring conductors and anode conductors being formed of a metallic film; said colored antireflection thin film and said light-permeable anode conductors being divided into a number of fragments for delineating display indicia and formed into similar patterns on said insulating substrate so that said thin film overlies all of said anode conductors and occurs nowhere else in said second area and so that portions of said substrate are left exposed in said second area; and a phosphor layer deposited on each of said anode conductors in said exposed portions of said substrate which phosphor layer is adapted to emit light upon impingement of electrons emitted from a filamentary cathode thereon; thereby light emitted from said phosphor layer being observed from the other surface of said light-permeable insulating substrate through said substrate; and said color antireflection thin film acting to reduce the specular reflection of external light from said anode conductors and said wiring conductors.
Claim 3
Dependent Claim
22 words
A fluorescent display device as defined in claim 1, wherein said antireflection film is formed of a light-impermeable material with low reflectance.
Claim 4
Dependent Claim
22 words
A fluorescent display device as defined in claim 1, wherein said antireflection film is formed of a light-permeable material with low permeability.
Claim 5
Dependent Claim
47 words
A fluorescent display device as defined in claim 2, wherein said antireflection film is formed of metal oxides selected from the group consisting essentially of CrO, MnO, Fe 2 O 3 , NiO 2 , PtO 3 , PdO, SnO 2 and Ta 2 O 5 .
Claim 6
Dependent Claim
48 words
A fluorescent display device as defined in claim 3, wherein said antireflection film is formed of metal oxides selected from the group consisting essentially of MoO 2 , WO 2 , TiO 3 , Nb 2 O 5 , Eu 2 O 3 , ErO 3 and PbO.
Claim 7
Dependent Claim
21 words
A fluorescent display device as defined in claim 3, wherein said antireflection film is formed of Sb 2 S 3 .
Claim 8
Dependent Claim
19 words
A fluorescent display device as defined in claim 3, wherein said antireflection film is formed of Tl 2 S.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |