US5986733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative optical compensator tilted in respect to liquid crystal cell for liquid crystal display
Assignee: Teledyne Scientific and Imaging LLC
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Filing: 1993-04-30
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Granted: 1999-11-16
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Expires: 2013-04-30
Abstract
Abstract A normally white liquid crystal display includes polarizer and analyzer layers having perpendicular absorbing axes. A liquid crystal layer is disposed between the polarizer layer and the analyzer layer, with its director exhibiting an azimuthal twist through the layer. First and second electrodes are proximate to first and second major surfaces of the liquid crystal layer. A first negatively birefringent compensator layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, is disposed between the polarizer layer and the liquid crystal layer. A second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer and oriented with its optical axis substantially parallel to the optical axis of the first compensator layer, is disposed between the analyzer layer and the liquid crystal layer.
Inventors
- 👤 Bruce K. Winker
- 👤 William J. Gunning, III
- 👤 Donald B. Taber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:25
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133632; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397; G02F2413/00; G02F2413/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
176 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer, the liquid crystal layer being tilted with respect to the first compensator layer, the polarizer layer, and the analyzer layer.
Claim 2
Dependent Claim
176 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer, the liquid crystal layer being tilted with respect to the first compensator layer, the polarizer layer, and the analyzer layer.
Claim 3
Dependent Claim
172 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer, the first compensator layer being tilted with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 4
Dependent Claim
172 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer, the first compensator layer being tilted with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 5
Dependent Claim
234 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer disposed between the polarizer layer and the analyzer layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer; a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer and oriented with its optical axis substantially parallel to the optical axis of the first compensator layer, disposed between the analyzer layer and the liquid crystal layer, the liquid crystal layer being tilted with respect to the first and second compensator layers, the polarizer layer, and the analyzer layer.
Claim 6
Dependent Claim
234 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer disposed between the polarizer layer and the analyzer layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer; a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer and oriented with its optical axis substantially parallel to the optical axis of the first compensator layer, disposed between the analyzer layer and the liquid crystal layer, the liquid crystal layer being tilted with respect to the first and second compensator layers, the polarizer layer, and the analyzer layer.
Claim 7
Dependent Claim
230 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer disposed between the polarizer layer and the analyzer layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer; a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer and oriented with its optical axis substantially parallel to the optical axis of the first compensator layer, disposed between the analyzer layer and the liquid crystal layer, the first and second compensator layers being tilted with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 8
Dependent Claim
230 words
A normally white liquid crystal display, comprising: a polarizer layer having an absorbing axis; an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer; a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer; a first electrode proximate to a first major surface of the liquid crystal layer; a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and a first negatively birefringent compensator layer disposed between the polarizer layer and the analyzer layer, oriented with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state, disposed between the polarizer layer and the analyzer layer; a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer and oriented with its optical axis substantially parallel to the optical axis of the first compensator layer, disposed between the analyzer layer and the liquid crystal layer, the first and second compensator layers being tilted with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 9
Independent Claim
197 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially erpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the analyzer layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; and tilting the liquid crystal layer with respect to the first compensator layer, the polarizer layer, and the analyzer layer.
Claim 10
Independent Claim
197 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially erpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the analyzer layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; and tilting the liquid crystal layer with respect to the first compensator layer, the polarizer layer, and the analyzer layer.
Claim 11
Independent Claim
193 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the analyzer layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; and tilting the first compensator layer with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 12
Independent Claim
193 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the analyzer layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; and tilting the first compensator layer with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 13
Independent Claim
250 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the liquid crystal layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; placing a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer, between the analyzer layer and the liquid crystal layer; orienting the second compensator layer with its optical axis substantially parallel to the optical axis of the first compensator layer; and tilting the liquid crystal layer with respect to the first and second compensator layers, the polarizer layer, and the analyzer layer.
Claim 14
Independent Claim
250 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the liquid crystal layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; placing a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer, between the analyzer layer and the liquid crystal layer; orienting the second compensator layer with its optical axis substantially parallel to the optical axis of the first compensator layer; and tilting the liquid crystal layer with respect to the first and second compensator layers, the polarizer layer, and the analyzer layer.
Claim 15
Independent Claim
246 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the liquid crystal layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; placing a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer, between the analyzer layer and the liquid crystal layer; orienting the second compensator layer with its optical axis substantially parallel to the optical axis of the first compensator layer; and tilting the first and second compensator layers with respect to the polarizer, analyzer, and liquid crystal layers.
Claim 16
Independent Claim
246 words
A method of compensating for phase retardation in a normally white liquid crystal display of the type including a polarizer layer having an absorbing axis, an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer, a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer, a first electrode proximate to a first major surface of the liquid crystal layer, and a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential, the method comprising the steps of: placing a first negatively birefringent compensator layer between the polarizer layer and the liquid crystal layer; orienting the first compensator layer with its optical axis substantially parallel to the average direction of the optical axis within a central, nominally homeotropic region of the liquid crystal layer in its driven state; placing a second negatively birefringent compensator layer, with a birefringence substantially the same as the birefringence of the first compensator layer, between the analyzer layer and the liquid crystal layer; orienting the second compensator layer with its optical axis substantially parallel to the optical axis of the first compensator layer; and tilting the first and second compensator layers with respect to the polarizer, analyzer, and liquid crystal layers.
References Cited (Backward Citations)
US4701028A
Cited
EP0239433A1
Cited
US4889412A
Cited
EP0350383A2
Cited
EP0349900A2
Cited
EP0372973A2
Cited
US5124824A
Cited
US5194975A
Cited
JPH04115224A
Cited
US5291323A
Cited
US5196853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-11-15 | 2003-05-17 | 2003-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-15 | 2007-05-17 | 2007-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-15 | 2011-05-17 | 2011-11-16 | $7700.00 | Window Closed / Lapsed |