Patent US3912366A successfully refreshed from Google Patents.
US3912366A
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Liquid crystal display assembly having polyimide layers
Assignee: International Business Machines Corp
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Filing: 1973-12-06
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Granted: 1975-10-14
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Expires: 1993-12-06
Abstract
Abstract Liquid crystal display cells having a nematic liquid crystal material sandwiched between two electrode carrying supporting substrates, incorporate polyimide layers for dielectric and optical purposes.
Inventors
- 👤 Gerard J Sprokel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133345
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A LIQUID CRYSTAL DISPLAY CELL COMPRISING: FIRST AND SECOND SPACED APART SUPPORT MEMBERS, SAID FIRST MEMBER BEING TRANSPARENT AND SAID SECOND MEMBER BEING REFLECTIVE, A TRANSPARENT LAYER OF IMIDE POLYMER HAVING A THICKNESS OF BETWEEN ABOUT 5 AND 10 MICRONS COATED ON THE FACING SURFACE OF THE SECOND MEMBER, A FIRST ELECTRODE FORMED ON THE SURFACE OF SAID IMIDE POLYMER LAYER A DELILECTRIC COATING FORMED ON THE SURFACE OF SAID AFIRST ELECTRODE A SECOND TRANSPARENT ELECTRODE FORMED ON THE FACING SURFACE OF SAID SUPPAORT MEMBER A NEMATIC LIQUID CRYSTAL MATERIAL LOCATED BETWEEN SAID ELECTRODES AND MEANS TO APPLY A VOLTAGE OF PREDETERMINED MAGNITUDE AND FREQUENCY ACROSS SAID ELECTRODES TO CAUSE DYNAMIC SCATTERING IN SAID LIQUID CRYSTAL MATERIAL,
Claim 2
Dependent Claim
117 words
A LIQUID CRYSTAL DISPLAY CELL COMPRISING: FIRST AND SECOND SPACED APART SUPPORT MEMBERS, SAID FIRST MEMBER BEING TRANSPARENT AND SAID SECOND MEMBER BEING REFLECTIVE, A TRANSPARENT LAYER OF IMIDE POLYMER HAVING A THICKNESS OF BETWEEN ABOUT 5 AND 10 MICRONS COATED ON THE FACING SURFACE OF THE SECOND MEMBER, A FIRST ELECTRODE FORMED ON THE SURFACE OF SAID IMIDE POLYMER LAYER A DELILECTRIC COATING FORMED ON THE SURFACE OF SAID AFIRST ELECTRODE A SECOND TRANSPARENT ELECTRODE FORMED ON THE FACING SURFACE OF SAID SUPPAORT MEMBER A NEMATIC LIQUID CRYSTAL MATERIAL LOCATED BETWEEN SAID ELECTRODES AND MEANS TO APPLY A VOLTAGE OF PREDETERMINED MAGNITUDE AND FREQUENCY ACROSS SAID ELECTRODES TO CAUSE DYNAMIC SCATTERING IN SAID LIQUID CRYSTAL MATERIAL,
Claim 3
Dependent Claim
13 words
The cell of claim 1 wherein said dielectric coating is an imide polymer.
Claim 4
Dependent Claim
16 words
The cell of claim 1 wherein said second member is metal with a polished reflective surface.
Claim 5
Dependent Claim
19 words
The cell of claim 1 wherein said second member is glass having a layer of reflecting material coated thereon.
Claim 6
Dependent Claim
27 words
The cell of claim 1 wherein said imide polymer layer is formed of a heat cured polyamic acid intermediate of an aromatic diamine and an aromatic dianhydride.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |