US5452113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color display element having PDLC layers and color filter
Assignee: NEC Corp
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Filing: 1992-06-19
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Granted: 1995-09-19
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Expires: 2012-06-19
Abstract
Abstract A color display element comprising a first substrate, a first electrode, a first dimmer layer in which light-scattering and transparent states can be controlled by an external electric field, a color filter, a second dimmer layer in which light-scattering and transparent states can be controlled by an external electric field, and a second substrate, each disposed in the above order as viewed from the side from which light enters, a light-absorbing layer being provided behind said second dimmer layer as viewed from the side from which light enters to absorb the light which passes through said first dimmer layer, color filter and second dimmer layer.
Inventors
- 👤 Hidenori Ikeno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13476; G02F1/1335; G02F1/133509; G02F1/133514
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
118 words
A color display element comprising the following components arranged in the following order: a first substrate, a first electrode, a first dimmer layer having light-scattering and transparent states which are controlled by an external electric field, a color filter, a second dimmer layer having light-scattering and transparent states which are controlled by an external electric field, a second electrode, and a second substrate; each of said components being provided in the above order as viewed from the side from which light enters; and a light-absorbing layer being provided behind said second dimmer layer, as viewed from the light entering side, to absorb the light which passes through said first substrate, first electrode, color filter and second dimmer layer.
Claim 2
Dependent Claim
118 words
A color display element comprising the following components arranged in the following order: a first substrate, a first electrode, a first dimmer layer having light-scattering and transparent states which are controlled by an external electric field, a color filter, a second dimmer layer having light-scattering and transparent states which are controlled by an external electric field, a second electrode, and a second substrate; each of said components being provided in the above order as viewed from the side from which light enters; and a light-absorbing layer being provided behind said second dimmer layer, as viewed from the light entering side, to absorb the light which passes through said first substrate, first electrode, color filter and second dimmer layer.
Claim 3
Dependent Claim
34 words
A color display element as set forth in claim 1 wherein at least one of said first and second dimmer layers comprises a layer containing a liquid crystal material dispersed within a photo-setting compound.
Claim 4
Dependent Claim
44 words
A color display element as set forth in claim 1 wherein at least one of said first and second dimmer layers is transparent to light when no voltage is applied and enters a light-scattering state when voltage above a predetermined threshold value is applied.
Claim 5
Dependent Claim
64 words
A color display element as set forth in claim 2 wherein at least one of said first and second dimmer layers comprises a layer containing a liquid crystal material, which can take at least a value negative in dielectric constant anisotropy, within a photo-setting compound; and wherein an interface between said liquid crystal material and said photo-setting compound has a predetermined state of orientation.
Claim 6
Dependent Claim
48 words
A color display element as set forth in claim 4 wherein illumination by light is used to set a mixed solution of said liquid crystal material and said photo-setting compound, with an electric field, a magnetic field or both applied thereto to set and form the dimmer layer.
Claim 7
Dependent Claim
25 words
A color display element as set forth in claim 1 wherein said first and second dimmer layers lie immediately above and below said color filter.
Claim 8
Dependent Claim
34 words
A color display element as set forth in claim 1 wherein a pair of said first and second substrates, on the surface of which transparent electrodes composed of an ITO are formed, is used.
Claim 9
Dependent Claim
29 words
A color display element as set forth in claim 1 wherein a double frequency driven liquid crystal is used for a liquid crystal component of said second dimmer layer.
Claim 10
Dependent Claim
32 words
A color display element as set forth in claim 2 wherein said liquid crystal material is provided with an aromatic ring within its basic skeleton and is negative in dielectric constant anisotropy.
Claim 11
Dependent Claim
65 words
The color display element as set forth in claim 1 wherein: said element displays black when said first and second dimmer layers are both driven to the transparent state; said element displays color when said first dimmer layer is transparent and said second dimmer layer is in a light-scattering state and said element displays white when said first dimmer layer is in a light-scattering state.
Claim 12
Dependent Claim
127 words
A color display element comprising the following components arranged in the following order: a first substrate, a first electrode, a first dimmer layer having light-scattering and transparent states which are controlled by an external electric field, a second dimmer layer having light-absorbing and transparent states which are controlled by an external electric field, a second electrode and a second substrate disposed in the above order as viewed from a side from which light enters, a light-reflecting layer being provided behind said second dimmer layer, and adjacent to said second substrate, as viewed from the side from which light enters, to reflect the light which passes through said first and second dimmer layers, and a color filter disposed between said first dimmer layer and said second dimmer layer.
Claim 13
Dependent Claim
127 words
A color display element comprising the following components arranged in the following order: a first substrate, a first electrode, a first dimmer layer having light-scattering and transparent states which are controlled by an external electric field, a second dimmer layer having light-absorbing and transparent states which are controlled by an external electric field, a second electrode and a second substrate disposed in the above order as viewed from a side from which light enters, a light-reflecting layer being provided behind said second dimmer layer, and adjacent to said second substrate, as viewed from the side from which light enters, to reflect the light which passes through said first and second dimmer layers, and a color filter disposed between said first dimmer layer and said second dimmer layer.
Claim 14
Dependent Claim
21 words
A color display element as set forth in claim 11 wherein a dichroism pigment is dispersed within said second dimmer layer.
Claim 15
Dependent Claim
33 words
A color display element as set forth claim 11 wherein at least one of said first and second dimmer layers comprises a layer containing a liquid crystal material dispersed within a photo-setting compound.
Claim 16
Dependent Claim
51 words
A color display element as set forth in claim 11 wherein at least one of said first and second dimmer layers transmits light when no voltage is applied, and when voltage above a predetermined threshold value is applied, said first dimmer layer scatters light and said second dimmer layer absorbs light.
Claim 17
Dependent Claim
63 words
A color display element as set forth claim 13 wherein at least one of said first and second dimmer layers comprises a layer containing a liquid crystal material which can take at least a value negative in dielectric constant anisotropy within a photo-setting compound, and wherein the interface between said liquid crystal material and said photo-setting compound has a predetermined state of orientation.
Claim 18
Dependent Claim
48 words
A color display element as set forth in claim 15 wherein illumination by light is used to set a mixed solution of said liquid crystal material and said photo-setting compound, with an electric field, a magnetic field or both applied thereto to set and form the dimmer layer.
Claim 19
Dependent Claim
25 words
A color display element as set forth in claim 11 wherein said first and second dimmer layers lie immediately above and below said color filter.
Claim 20
Dependent Claim
35 words
A color display element as set forth in claim 11 wherein a pair of of said first and second substrates, on the surface of which transparent electrodes composed of an ITO are formed, is used.
Claim 21
Dependent Claim
31 words
A color display element as set forth in claim 11 wherein a double frequency driven liquid crystal is used for a liquid crystal component of said first or second dimmer layer.
Claim 22
Dependent Claim
31 words
A color display element as set forth claim 13 wherein said liquid crystal material is provided with an aromatic ring within its basic skeleton and is negative in dielectric constant anisotropy.
Claim 23
Dependent Claim
30 words
A color display element as set forth in claim 11 wherein said first dimmer layer is a normally responsive type and said second dimmer layer is a reversely responsive type.
Claim 24
Dependent Claim
22 words
A color display element as set forth in any one of claims 11-19, comprising liquid crystal elements driven by an active element.
Claim 25
Dependent Claim
61 words
The color display element as set forth in claim 11 wherein; the element displays black when said first dimmer layer is transparent and said second dimmer layer is in a light-absorbing state; said element displays color when said first and second dimmer layers are both transparent; and said element displays white when said first dimmer layer is in a light-scattering state.
References Cited (Backward Citations)
US4581608A
Cited
US5132815A
Cited
US4693560A
Cited
US4944576A
Cited
US5223959A
Cited
US5283563A
Cited
US5194973A
Cited
US5296952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |