US3844637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated liquid crystal luminophor display
Assignee: Bunker Ramo Corp
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Filing: 1973-08-29
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Granted: 1974-10-29
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Expires: 1993-08-29
Abstract
Abstract An improved display device is provided utilizing a luminophor mixed with a nematic liquid crystal material. When illuminated with a selected source of radiation, the luminophor is excited to visibility, emitting a characteristic color over a wide angle. This approach may be used with liquid crystal displays operating in the dynamic scattering and field effect modes.
Inventors
- 👤 J Masi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:17
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13762; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K2019/0425; C09K2019/0433
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
IN A DISPLAY DEVICE HAVING A LIQUID CRYSTAL MATERIAL POSITIONED BETWEEN TWO PARALLEL PLATES, EACH PLATE HAVING ELECTRODES NEXT TO THE LIQUID CRYSTAL MATERIAL AND AN ALTERNATING CURRENT SOURCE CONNECTTED ACROSS THE ELECTRODES FOR PROVIDING AN ELECTRIC FIELD ACROSS THE LIQUID CRYSTAL MATERIAL, THE IMPROVEMENT COMPRISING A. A LUMINOPHOR MIXED WITH A NEMATIC TYPE LIQUID CRYSTAL MATERIAL IN WHICH MOLECULES OF THE LUMINOPHOR ARE ATTACHED AND MOVE IN ACCORDANCE WITH THE MOVEMENT OF THE MOLECULES OF THE NEMATIC LIQUID CRYSTAL MATERIAL, AND B. A PREDETERMINED SOURCE OF RADIATION APPLIED TO THE MIXTURE OF LUMINOPHOR AND NEMATIC LIQUID CRYSTAL MATERIAL CAUSING THE LUMINOPHOR TO EMIT VISIBLE RADIATION OF A CHARACTERISTIC COLOR OVER A VERY WIDE ANGLE IN THE PRESENCE OF SAID ELECTRIC FIELD.
Claim 2
Dependent Claim
122 words
IN A DISPLAY DEVICE HAVING A LIQUID CRYSTAL MATERIAL POSITIONED BETWEEN TWO PARALLEL PLATES, EACH PLATE HAVING ELECTRODES NEXT TO THE LIQUID CRYSTAL MATERIAL AND AN ALTERNATING CURRENT SOURCE CONNECTTED ACROSS THE ELECTRODES FOR PROVIDING AN ELECTRIC FIELD ACROSS THE LIQUID CRYSTAL MATERIAL, THE IMPROVEMENT COMPRISING A. A LUMINOPHOR MIXED WITH A NEMATIC TYPE LIQUID CRYSTAL MATERIAL IN WHICH MOLECULES OF THE LUMINOPHOR ARE ATTACHED AND MOVE IN ACCORDANCE WITH THE MOVEMENT OF THE MOLECULES OF THE NEMATIC LIQUID CRYSTAL MATERIAL, AND B. A PREDETERMINED SOURCE OF RADIATION APPLIED TO THE MIXTURE OF LUMINOPHOR AND NEMATIC LIQUID CRYSTAL MATERIAL CAUSING THE LUMINOPHOR TO EMIT VISIBLE RADIATION OF A CHARACTERISTIC COLOR OVER A VERY WIDE ANGLE IN THE PRESENCE OF SAID ELECTRIC FIELD.
Claim 3
Dependent Claim
31 words
A display device as set forth in claim 1 wherein said nematic type liquid crystal is selected from a group consisting of MBBA, EBBA, or a combination of MBBA and EBBA.
Claim 4
Dependent Claim
17 words
A display device as set forth in claim 1 wherein said luminophor is an organic fluorescent material.
Claim 5
Dependent Claim
17 words
A display device as set forth in claim 3 wherein said luminophor is an organic phosphorescent material.
Claim 6
Dependent Claim
27 words
A display device as set forth in claim 1 having a polarizer positioned in front of and behind said two parallel plates for providing a field-effect display.
References Cited (Backward Citations)
US3775631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |